WO2019092600A1 - Marteau perforateur pneumatique - Google Patents

Marteau perforateur pneumatique Download PDF

Info

Publication number
WO2019092600A1
WO2019092600A1 PCT/IB2018/058727 IB2018058727W WO2019092600A1 WO 2019092600 A1 WO2019092600 A1 WO 2019092600A1 IB 2018058727 W IB2018058727 W IB 2018058727W WO 2019092600 A1 WO2019092600 A1 WO 2019092600A1
Authority
WO
WIPO (PCT)
Prior art keywords
head
skirt
piston
drill hammer
wear sleeve
Prior art date
Application number
PCT/IB2018/058727
Other languages
English (en)
Inventor
Bernard Lionel Gien
Original Assignee
Gien Bernard L
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 Gien Bernard L filed Critical Gien Bernard L
Publication of WO2019092600A1 publication Critical patent/WO2019092600A1/fr
Priority to ZA2020/03259A priority Critical patent/ZA202003259B/en

Links

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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers

Definitions

  • the invention relates to a pneumatic drill hammer of the down-the-hole type.
  • the energy output of down the hole drilling hammers is increasing as compressor manufacturers increase the pressure output of their compressors.
  • the higher energy output is accompanied by higher frequencies of a reciprocating, striking piston resulting in Shockwaves in the internal parts of the hammer. This causes the parts to pick up a resonance, start bouncing and cause wear and tear to their mating parts. In the result, hammers can fail and broken parts require replacement.
  • One of the hammer parts that is significant in relation to assembly at the time of manufacture and also to disassembly and reassembly for repairs is the back-head.
  • a drill hammer comprising: a reciprocating piston with a first end and a second end,
  • the piston having an axial piston bore extending from the first end to the second end, the first end of the piston providing a working area in a drive chamber and the second end providing a working area in a return chamber,
  • control rod of hollow construction supported from a dividing wall of a back-head which withdraws from the piston bore at the first end to exhaust the drive chamber
  • a back-head connector with an axial inlet and a hollow, externally screw- threaded spigot that engages into the socket of the back-head
  • a check valve having a check valve closure provided on a head at one end of a stem slidably supported inside the control rod with a spring on the stem biasing the check valve closure against a valve seat provided by the back-head connector, and
  • At least one inlet port extending from within the back-head socket to an air supply passage extending between the skirt and the wear sleeve to an air distribution chamber.
  • the invention further provides for a drill hammer as defined:
  • the air supply passage is formed around the skirt on the inside of the wear sleeve through external slots at a front end of the skirt with ridges provided between the slots that locate against a bore of the wear sleeve;
  • the skirt has an internal under-cut portion spaced apart from a free end of the skirt with an annular internal shoulder located between the under ⁇ cut portion and the free end, the under-cut portion forming the drive chamber with the piston ;
  • the back-head includes a locating shoulder with an externally screw-threaded portion provided between the locating shoulder and the skirt that tightens into the wear sleeve with the locating shoulder being pulled up against a face at a rear end of the wear sleeve;
  • control rod is press-fitted through a central, axial opening formed through the dividing wall of the back-head
  • control rod to has an open inner end exposed to exhaust pressure of the drill hammer.
  • Figure 1 a cross-sectional view of a top half of a pneumatic drill hammer; and Figure 2 a cross-sectional view of a bottom half of the drill hammer.
  • annular locating shoulder 1 03 is provided on a back-head 105 and locates against an outer face 107 at a rear end of a wear sleeve 109.
  • a cylindrical forwardly disposed air distribution skirt 1 1 1 is formed integrally as part of the back-head 105 and extends into a bore 1 13 of the wear sleeve 109.
  • the back-head 105 has an externally screw-threaded portion 1 15.
  • the screw- threaded portion 1 1 5 is extends in a region of the back-head 105 between the locating shoulder 103 and the skirt 1 1 1 .
  • the screw-threaded portion 1 15 is tightened with the locating shoulder 103 abutting against the outer face 1 07 of the wear sleeve 109.
  • the back-head 1 05 is held in place by the continuous tightening of the screw-thread at 1 1 5 on the back-head 105 into an internally screw-threaded portion 1 17 adjacent the outer face 107 of the wear sleeve 109.
  • a control rod 1 1 9 of hollow construction is press-fitted through a central, axial opening 121 formed through a dividing wall 123 of the back-head 1 05.
  • An outward step 120 on the control rod 1 1 9 abuts the dividing wall 123 once this part has been pressed into place.
  • a spring activated check valve 124 is located inside the back-head 105.
  • a check valve closure 1 25 is provided on a head 1 27 at one end of a stem 1 29.
  • the stem 129 is slidably supported in a bore 1 31 of the control rod 1 19.
  • a compression spring 133 is located against a shoulder 1 35 inside the bore 1 31 of the hollow control rod 1 19.
  • a back-head connector 1 37 is securable into a socket 1 39 provided on a rear side of the back-head 105.
  • the back-head connector 1 37 provides a hollow spigot 138 which together with the back-head socket 139 provides corresponding screw-threads at 141 that provide secure engagement between these two components.
  • the back-head connector 137 provides an inlet 142 that leads to an annular concentric valve seat 143 for the check valve closure 125. Both the inlet 142 and valve seat 143 are located centrally or axially in the back-head connector 1 37. With the back-head connector 137 coupled to the back-head 105, the spring 1 33 biases the check valve closure 125 against the valve seat 143.
  • the inlet 142 opens through the valve seat 143 into a cavity 144 on the inside of the hollow spigot 1 38 that accommodates the valve closure 125.
  • the head 1 27 providing the check valve closure 1 25 is larger than a diameter of the inlet 142 in the back-head connector 137. The arrangement allows for larger check valve closures 125 and, more importantly, an inlet in the back-head connector 1 37 that may be of relatively small diameter.
  • the back-head connector 137 can be made with a choice of connecting threads adjacent an outer end 145 and could be of any suitable length.
  • the back-head connector 1 37 is tapered to provide a conical formation 147 with a screw-thread for engagement to a drill string (not shown).
  • Inclined inlet ports 149 are provided through the dividing wall 123 of the back- head 105 to connect the air from an inlet chamber 151 (provided by the socket 139 and cavity 144) around the check valve closure 125, into a cut-out 153 in the bore 1 1 3 of the wear sleeve 109.
  • This arrangement of parts provides an air supply passage 154 to an air distribution chamber 159 between a piston 161 and the wear sleeve 109.
  • Slots 1 55 provided adjacent a free or front end 157 of the skirt 1 1 1 allow compressed air to pass into the air distribution chamber 1 59. Ridges 163 between the slots 155 are provided to abut the bore 1 1 3 of the wear sleeve 109 at this location. In the result, the front end 157 of the skirt 1 1 1 is supported against movement in the wear sleeve 1 09.
  • An inner wall 165 of the skirt 1 1 1 is outwardly stepped with an under-cut portion 167 that forms part of a drive chamber 1 69.
  • the under-cut portion 167 provides an annular, internal shoulder 173 adjacent the free end of the skirt 1 1 1 .
  • a bridging port 173 is provided for supply of air to past the shoulder 171 of the skirt 1 1 1 to the drive chamber 1 69.
  • the bridging port 173 is formed by bridging grooves 175 cut into the outside of the piston 161 .
  • the bridging grooves 1 75 enable a first, rear end "A" of the piston 161 to be guided by the front end 157 of the skirt 1 1 1 throughout the entire working stroke of the piston 161 , with ridges between the bridging grooves 175 slidably engaged by the internal shoulder 171 , when air is being supplied to the drive chamber 1 69.
  • An annular recess would not provide the same guiding and stability as the bridging grooves 1 75.
  • compressed air enters through the inlet 142 in the back-head connector 137 and pushes the check valve closure 125 down away from the valve seat 143.
  • compressed air flows through inlet ports 149 along cut out 153 in the wear sleeve 109, through grooves 1 55 and into distribution chamber 159.
  • Pressurised air in the distribution chamber 159 acts on a rear shoulder 177.1 and 177.2 of the piston 161 .
  • the rear shoulder is provided by an area 177.1 at the bottom of first by-pass grooves 179 and by an area 1 77.2 on the top of ridges between the first by-pass grooves 179.
  • a return chamber lifting port 1 81 provided as a recess in the wear sleeve 1 09 is located to the outside of a lateral shoulder providing a switching land 183, represented by a full diameter of the piston 161 .
  • Second by-pass grooves 185 extend from below the switching land 183 to adjacent a second, front end "B" of the piston 1 61 .
  • the air from the distribution chamber 159 flows through first by-pass grooves 1 79 around the switching land 1 83 into the return chamber lifting port 181 which connects via second by-pass grooves 1 85 into a return chamber 1 87.
  • the return chamber 187 is charged with compressed air and the resulting pressure acts on a front shoulder 189.1 and 189.2 and the second end "B" of the piston 161 , which together represent a greater working surface area than the rear shoulder 177.1 and 177.2.
  • the piston 1 61 is propelled towards the back-head side of the hammer 101 . In its rearward travel, the switching land 183 passes the lifting port 181 and cuts off the air supply to return chamber 1 87.
  • the piston 161 continues in its upward travel as the compressed air in return chamber 187 expands.
  • the piston 161 includes an axial piston bore 191 that moves over the control rod 1 19 to isolate the drive chamber 169.
  • the piston bore 191 at its second front end "B" cooperates with a foot valve tube 193 secured into a rear end of a rock drill bit 195.
  • the drill bit 195 is similarly provided with an axial bit bore 1 97 having two inclined vents that open through a bit face. An exhaust passage from the return chamber 187 is accordingly provided when the piston 1 61 is pulled away from the foot valve tube 193.
  • the piston bore 1 91 disengages from the control rod 1 19 and the drive chamber 169 exhausts down the piston bore 191 , bit bore 197 and vents through the bit face to atmosphere.
  • the piston bore 191 has again closed over the foot valve tube 193 and charging of the return chamber commences 1 87. The cycle is repeated.
  • the drill hammer of the invention accordingly provides a construction and combination of components providing the back-head that are (relatively) easy to manufacture and maintain (including assembly and disassembly) and/or demonstrate competent performance with reduced wear through continuous guiding of the piston during operation.
  • a person skilled in the art will appreciate that a number of variations may be made to the combination of drill hammer features described without departing from the scope of the present invention.

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)

Abstract

L'invention concerne un marteau perforateur pneumatique (101) qui comprend une tige de commande creuse (119) supportée par une paroi de séparation (123) d'une tête arrière qui se retire d'un alésage de piston (191) à la première extrémité pour évacuer une chambre d'entraînement (169). La paroi de séparation (123) est disposée entre un embout femelle à filetage intérieur (115) disposé vers l'arrière et une jupe de distribution d'air (111) intégrée, disposée vers l'avant, qui s'étend dans un manchon d'usure (109). Un connecteur de tête arrière (137) avec une entrée axiale (142) et un embout mâle à filetage extérieur (125) s'engage dans l'embout femelle (139). Une fermeture de clapet de non-retour (125) est disposée à une extrémité d'une tige qui est supportée de manière coulissante à l'intérieur de la tige de commande (119) avec une sollicitation de ressort (133) contre un siège de clapet (143) fournie par le connecteur de tête arrière (137). Des orifices d'entrée inclinés (149) s'étendent de l'embout femelle à un passage d'alimentation en air (154) entre la jupe (111) et le manchon d'usure (109) vers une chambre de distribution d'air (159).
PCT/IB2018/058727 2017-11-07 2018-11-07 Marteau perforateur pneumatique WO2019092600A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ZA2020/03259A ZA202003259B (en) 2017-11-07 2020-06-01 A pneumatic drill hammer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201707028 2017-11-07
ZA2017/07028 2017-11-07

Publications (1)

Publication Number Publication Date
WO2019092600A1 true WO2019092600A1 (fr) 2019-05-16

Family

ID=66437661

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/058727 WO2019092600A1 (fr) 2017-11-07 2018-11-07 Marteau perforateur pneumatique

Country Status (2)

Country Link
WO (1) WO2019092600A1 (fr)
ZA (1) ZA202003259B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112647839A (zh) * 2021-01-19 2021-04-13 贵阳云海岩土工程有限公司 自旋式气动潜孔锤
WO2021198038A1 (fr) * 2020-03-30 2021-10-07 Mincon International Limited Agencements de rinçage et de raccordement pour outils de forage à percussion

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001083931A1 (fr) * 2000-04-28 2001-11-08 Ian Graeme Rear Marteau fond de trou possedant une reduction de tige superieure
WO2017118963A1 (fr) * 2016-01-10 2017-07-13 Gien Bernard L Marteau perforateur pneumatique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001083931A1 (fr) * 2000-04-28 2001-11-08 Ian Graeme Rear Marteau fond de trou possedant une reduction de tige superieure
WO2017118963A1 (fr) * 2016-01-10 2017-07-13 Gien Bernard L Marteau perforateur pneumatique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021198038A1 (fr) * 2020-03-30 2021-10-07 Mincon International Limited Agencements de rinçage et de raccordement pour outils de forage à percussion
US12024950B2 (en) 2020-03-30 2024-07-02 Mincon International Limited Flushing and connection arrangements for percussion drill tools
CN112647839A (zh) * 2021-01-19 2021-04-13 贵阳云海岩土工程有限公司 自旋式气动潜孔锤
CN112647839B (zh) * 2021-01-19 2023-03-10 贵阳云海岩土工程有限公司 自旋式气动潜孔锤

Also Published As

Publication number Publication date
ZA202003259B (en) 2021-07-28

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