SE505170C2 - Lowering drill with compressible spacer - Google Patents

Lowering drill with compressible spacer

Info

Publication number
SE505170C2
SE505170C2 SE9304125A SE9304125A SE505170C2 SE 505170 C2 SE505170 C2 SE 505170C2 SE 9304125 A SE9304125 A SE 9304125A SE 9304125 A SE9304125 A SE 9304125A SE 505170 C2 SE505170 C2 SE 505170C2
Authority
SE
Sweden
Prior art keywords
housing
length
slide
machine
guide
Prior art date
Application number
SE9304125A
Other languages
Swedish (sv)
Other versions
SE9304125D0 (en
SE9304125L (en
Inventor
Per Gustafsson
Original Assignee
G Drill 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
Application filed by G Drill Ab filed Critical G Drill Ab
Priority to SE9304125A priority Critical patent/SE505170C2/en
Publication of SE9304125D0 publication Critical patent/SE9304125D0/en
Priority to KR1019960703110A priority patent/KR100352883B1/en
Priority to ES95919251T priority patent/ES2194910T3/en
Priority to EP95919251A priority patent/EP0733152B1/en
Priority to DE69432312T priority patent/DE69432312T2/en
Priority to CA002178814A priority patent/CA2178814C/en
Priority to JP51670395A priority patent/JP3588467B2/en
Priority to PCT/SE1994/001201 priority patent/WO1995016848A1/en
Priority to AU12866/95A priority patent/AU685561B2/en
Publication of SE9304125L publication Critical patent/SE9304125L/en
Priority to US08/664,905 priority patent/US5715897A/en
Publication of SE505170C2 publication Critical patent/SE505170C2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Details Of Valves (AREA)

Abstract

An in-hole rock drilling machine has a tubular housing (12) with a piston hammer (24) that is guided at its ends only. Its front portion is guided by a guide bushing (18) that takes support against a shoulder (13) in the housing and its rear end is guided by a valve housing (20). The guide bushing (18), the valve housing (20) and a distance tube (19) between them are clamped together against the shoulder (13) by means of a back head (22) screwed to the machine housing (12). The distance tube (19) is adapted to be compressed axially at least 0.3 pro mille of its length and preferably between 0.8 and 3 pro mille of its length when the back head is screwed into position. This arrangement gives a robust machine and to assemble and to disassemble the machine will be simple. The tolerances in length will not be critical which makes the machining of the various machine parts less critical.

Description

505 170 tryckas ihop minst 0.3 och företrädesvis 0.8-3 promille av sin längd. Filterstödet 21 kan ha ungefär samma tvärsnitt som distanshylsan 19, men den är kortare och ger därför mindre tillskott till fjäderverkan.Ventilhusets bakstycke 38 spänns således fast mot ventilhusets 20 huvuddel. Ändstycket 22 är anordnat att skruvas fast pä ett konventionellt borrör som överför rotation till borrmaskinen och också tillför hydrauliskt drivmedium i form av tryckvatten till borrmaskinen. Utrymmet 58 bakom slidhuset 20 är således under drift ständigt trycksatt med filtrerat tryckvatten. 505 170 is compressed at least 0.3 and preferably 0.8-3 per mille of its length. The filter support 21 may have approximately the same cross section as the spacer sleeve 19, but it is shorter and therefore provides less addition to the spring action. The back piece 38 of the valve housing is thus clamped against the main part of the valve housing 20. The end piece 22 is arranged to be screwed onto a conventional drilling pipe which transmits rotation to the drilling machine and also supplies hydraulic drive medium in the form of pressurized water to the drilling machine. The space 58 behind the slide housing 20 is thus constantly pressurized with filtered pressurized water during operation.

Vid monteringen av maskinen staplas alla delarna 18,19, 20, 38. 21 löst pa varandra vilket gör monteringen enkel och minskar kraven pa längdtoleranser. Toleranserna tas upp av den axiella sammantryckningen. Alla delarna glider lätt i maskinhuset och är därför lätta att få ut vid demontering.When assembling the machine, all the parts 18, 19, 20, 38 are stacked loosely on top of each other, which makes assembly easy and reduces the requirements for length tolerances. The tolerances are taken up by the axial compression. All parts slide easily in the machine housing and are therefore easy to remove when disassembling.

Ett rör 23 bildar del av slidhuset 20. En slagkolv 24 med en genomgående kanal 25 har sin främre ände styrd i styrbussningen 18. Slagkolvens bakände bildar en hals 27 som sträcker sig in i det ringformiga cylinderrum 26, som bildas mellan slidhusets 20 hylsliknande framände 35 och slidhusets rör 23. Slagkolvens bakände (halsen 27) styrs således av cylinderrummets 26 väggar. Slagkolvens hals 27 har ett spår 28 med en bakre kant 29 sa att slagkolven får en definierad yttre styryta 30 bakom kanten 29. Mot röret 23 är slagkolven slipad sa att den ocksa där får en glidyta 31 av definierad längd,lämpligen med ungefär samma längd som glidytan 30.A tube 23 forms part of the slide housing 20. An impact piston 24 with a through-going channel 25 has its front end guided in the guide bushing 18. The rear end of the impact piston forms a neck 27 extending into the annular cylinder space 26 formed between the sleeve-like end 35 of the slide housing 20. and the tube 23 of the slide housing 23. The rear end of the percussion piston (neck 27) is thus guided by the walls of the cylinder space 26. The neck 27 of the percussion piston has a groove 28 with a rear edge 29 so that the percussion piston has a defined outer guide surface 30 behind the edge 29. Towards the tube 23 the percussion piston is ground so that it also has a sliding surface 31 of defined length, suitably about the same length as glidytan 30.

Slagkolvens 24 styrytelängder 18 och 30,31 upptar bara en mindre del av slagkolvens längd och den största delen av slagkolven är belägen mellan styrningarna och har stort spel mot husets distanshylsa 19. Lämpligen kan slagkolven ha en förtjockning 32 över större delen av sin längd för att få större massa.The strut lengths 18 and 30,31 of the percussion piston occupy only a small part of the length of the percussion piston and the largest part of the percussion piston is located between the guides and has a large play against the housing sleeve 19. The piston may suitably have a thickening 32 over most of its length. get bigger mass.

I kolvens framände definieras styrytelängden således av styrbussningen 18 medan slagkolvens glidytor 30,31 definierar styrytelängden i slagkolvens bakände. 505 170 Styrytelängderna upptar tillsammans mindre än 20% av slagkolvens längd.At the front end of the piston, the steering length is thus defined by the guide bushing 18, while the sliding surfaces 30,31 of the striking piston define the steering length at the rear end of the striking piston. 505 170 The styrene lengths together occupy less than 20% of the length of the percussion piston.

Kolvens styryta 33 mot styrbussningen 18 har en mindre diameter än styrytan 30 mot slidhuset sä att slagkolven fär en differentialkolvyta 1 det främre cylinderrum 34 som bildas ellan styrbussningen 18 och slidhuset 20. Denna differentialkolvyta kan anses utgöra en del av den yta som betecknats med 36. Denna dfferentialkolvyta är mindre än slagkolvens ringformiga kolvyta 37 1 bakre cylinderrummet 26.The guide surface 33 of the piston against the guide bush 18 has a smaller diameter than the guide surface 30 against the slide housing so that the percussion piston has a differential piston surface 1 in the front cylinder space 34 formed between the guide bush 18 and the slide housing 20. This differential piston surface can be considered part of the surface designated 36. This differential piston surface is smaller than the annular piston surface 37 of the percussion piston 37 in the rear cylinder space 26.

Ventilhuset innehåller en rörformig ventilslid 40 med tre styrytor Al,A2 och A3 som befinner sig 1 tre ringformiga styrkammare 45,46 och 47. Ytan A3 är en differentialyta som uppkommer genom att diametern på slidens 40 glidyta närmast A1 är större än diametern på slidens glidyta närmast A2.The valve housing contains a tubular valve slide 40 with three guide surfaces A1, A2 and A3 located in three annular guide chambers 45, 46 and 47. The surface A3 is a differential surface which arises in that the diameter of the slide surface of the slide 40 closest to A1 is larger than the diameter of the slide slide surface. closest to A2.

För dessa styrytor gäller sambandet A3 < A1 < A2+A3. Ytan A2 är större än ytan A3 och lämpligen kan Al och A2 vara ungefär lika stora och ungefär dubbelt sä stora som A3. Det finns ytterligare en ringkammare 48 som 1 det visade ventilläget är öppen mot ringkammaren 47 men 1 slidens andra läge är avskild frän ringkammaren 47 genom en skuldra 49 1 ventilhuset. Sliden 40 har en rad grova borrningar 50 och två smala borrningar 51.For these control surfaces the relationship A3 <A1 <A2 + A3 applies. The surface A2 is larger than the surface A3 and suitably A1 and A2 can be approximately equal in size and approximately twice as large as A3. There is a further annular chamber 48 which in the valve position shown is open towards the annular chamber 47 but in the second position of the slide is separated from the annular chamber 47 by a shoulder 49 in the valve housing. The slide 40 has a series of coarse bores 50 and two narrow bores 51.

En styrkanal 52 leder leder mellan ringkammaren 46 och bakre cylinderrummet 26 med en styrport 53 till cylinderrummet 26.A guide channel 52 directs leads between the annular chamber 46 and the rear cylinder space 26 with a guide port 53 to the cylinder chamber 26.

En annan styrkanal 54 leder mellan ringkammaren 45 och bakre cylinderrummet 26 med styrportar 55 och 56 till cylinderrummen 26 och 34. Ett antal parallella kanaler 57 leder axiellt rakt igenom ventilhuset 20 och förbinder det främre cylinderrummet 34 med det ständigt trycksatta utrymmet 56 bakom slidhuset 20. Ett antal kanaler 59 förbinder en rad portar 60 1 det bakre cylinderrummet 26 med en rad portar 61 1 ringkammaren 48. Ett antal kanaler 505 170 förbinder en rad portar 62 i ringkammaren 47 med det under drift ständigt trycksatta utrymmet 58 bakom slidhuset 20 Maskinens funktionssätt ska nu beskrivas.Another guide channel 54 leads between the annular chamber 45 and the rear cylinder space 26 with guide ports 55 and 56 to the cylinder spaces 26 and 34. A number of parallel channels 57 lead axially straight through the valve housing 20 and connect the front cylinder space 34 to the constantly pressurized space 56 behind the slide housing 20. A plurality of channels 59 connect a series of ports 60 in the rear cylinder space 26 to a series of ports 61 in the annular chamber 48. A plurality of channels 505 170 connect a series of ports 62 in the annular chamber 47 to the constantly pressurized space 58 behind the slide housing 20. now described.

Antag att sliden 40 star i sitt visade läge och att slagkolven 24 har påbörjat sitt arbetsslag för att slå pa borrkronan 14. slagläge.) Sliden 40 trycksätter då det bakre cylinderrummet 26 fran utrymmet 58 via portarna 62,61 och 60. Styrytan A1 är tryckbelastad under hela arbetsslaget eftersom styrkanalens 54 styrport 56 först är öppen till det ständigt trycksatta främre tryokrummet 34 och sedan, strax efter det denna styrport 56 stängs, styrkanalens 54 styrport 55 i stället öppnas till det bakre trycksatta cylinderrummet 26.Assume that the slide 40 is in its shown position and that the percussion piston 24 has begun its working stroke to strike the drill bit 14. stroke position.) The slide 40 then pressurizes the rear cylinder space 26 from the space 58 via the ports 62, 61 and 60. The guide surface A1 is pressurized throughout the operation because the control port 56 of the control channel 54 is first open to the constantly pressurized front pressure chamber 34 and then, shortly after this control port 56 is closed, the control port 55 of the control channel 54 is instead opened to the rear pressurized cylinder space 26.

Längden pa slagkolvens styryta 30 kan, som visat, vara avpassad sa att bada portarna 56 och 55 är stängda under en kort mellanperiod, vilket emellertid inte hinner inverka pà trycket i styrkanalen 54. Sa länge styrkanalens 52 styrport 53 är stängd star därför sliden 40 stabilt i sitt visade främre läge pa grund av att ytan A1 övervinner ytan A3.As shown, the length of the guide surface 30 of the percussion piston can be adjusted so that both ports 56 and 55 are closed for a short intermediate period, which, however, does not have time to affect the pressure in the guide channel 54. As long as the guide channel 52 guide port 53 is closed, the slide 40 is stable in its shown front position due to the surface A1 overcoming the surface A3.

Läckaget från ringkammaren 46 förhindrar tryckuppbyggnad i ringkammaren 46.The leakage from the annular chamber 46 prevents pressure build-up in the annular chamber 46.

När slagkolven i sitt arbetsslag öppnar styrkanalens 52 styrport 53 strax efter det att den öppnat styrkanalens 54 styrport 55 trycksätts kanalen 52 och ringkammaren 46 och eftersom ytan A2 som da trycksätts är lika stor som den redan tryckbelastade ytan A1 sa balanserar dessa ytor varandra varför ytan A3 slar om sliden till dennas bakre ej visade läge. Halen 51 1 sliden kommer da mitt för ringkammaren 46 men de är sa små att de trots flödet genom dem inte hindrar trycksättningen av ringkammaren 46. Detta förlustläokage genom hälen 51 är sa litet att det inte nämnvärt påverkar totalverkningsgraden. Sliden 40 dämpas av sin nos 65 som avstänger en dämpkammare så att sliden (I 505 170 bromsas innan den landar i sitt ej visade bakre läge och därför inte tenderar att studsa. Ringkammaren 48 avstängs fran ringkammaren 47 och ansluts i stället via slidens borrningar 50 till slidens inre som via röret 12 är ständigt öppet till slagkolvens kanal 25 som i sin tur är ständigt öppen mot borrkronans spolkanal. Bakre cylinderrummet 26 blir därför tryckavlastat samtidigt som slagkolven när sitt slagläge och slagkolvens differentialkolvyta i det ständigt trycksatta främre cylinderrummet 34 börjar driva kolven bakat i dennas returslag.When the percussion piston in its working stroke opens the control port 53 of the control channel 52 shortly after it has opened the control port 55 of the control channel 54, the channel 52 and the annular chamber 46 are pressurized and since the surface A2 then pressurized is equal to the already pressurized surface A1, these surfaces balance each other. slides the slide to its rear not shown position. The tail 51 in the slide then comes in the middle of the annular chamber 46, but they are so small that despite the flow through them they do not prevent the pressurization of the annular chamber 46. This loss leakage through the heel 51 is so small that it does not appreciably affect the overall efficiency. The slide 40 is damped by its nose 65 which shuts off a damping chamber so that the slide (I 505 170 is braked before landing in its rear position not shown and therefore does not tend to bounce. The ring chamber 48 is closed from the ring chamber 47 and is instead connected via the slide bores 50 to the interior of the slide which is via the tube 12 constantly open to the stroke 25 of the piston which in turn is constantly open to the flushing channel of the drill bit. in its return stroke.

Det inbördes axiella läget av styrportarna 53 och 55 kan varieras och styrporten 53 behöver inte ligga axiellt framför porten 55.The mutual axial position of the guide ports 53 and 55 can be varied and the guide port 53 need not lie axially in front of the port 55.

Vattnet som strömmar ut ur bakre cylinderrummet 26 under slagkolvens returslag används således som spolmedium för att spola upp borrkaxet ur borrhàlet.The water flowing out of the rear cylinder space 26 during the return stroke of the percussion piston is thus used as a flushing medium to flush the drill cuttings out of the borehole.

När bakre cylinderrummet 26 tryckavlastas sa tryckavlastas bade styrytan Al och styrytan A2 eftersom såväl styrkanalens 54 port 55 som styrkanalens 52 port 53 är öppen mot det bakre cylinderrummet 26.When the rear cylinder space 26 is depressurized, both the guide surface A1 and the guide surface A2 are depressurized because both the port 55 of the control channel 54 and the port 53 of the control channel 52 are open to the rear cylinder space 26.

Under sitt returslag kommer slagkolven 24 att stänga portarna 55 och 53. Ringkammaren 46 fortsätter emellertid att vara dränerad, nu genom de små borrningarna 51 genom sliden. Sedan öppnar slagkolven 24 styrkanalens 54 port 56 sä att styrkanalen 54 och ringkammaren 45 trycksätts fran det främre cylinderrummet 34 och ytan A1 tryckbelastas.During its return stroke, the percussion piston 24 will close the ports 55 and 53. However, the annular chamber 46 continues to be drained, now through the small bores 51 through the slide. Then the percussion piston 24 opens the port 56 of the guide channel 54 so that the guide channel 54 and the annular chamber 45 are pressurized from the front cylinder space 34 and the surface A1 is pressurized.

Eftersom ytan A2 inte är trycksatt så slàr ytan A1 om sliden 40 till dennas främre läge i vilket den visas i figuren.Since the surface A2 is not pressurized, the surface A1 turns the slide 40 to its front position in which it is shown in the figure.

Under sista delen av slidens rörelse framåt stängs slidens tvâ små hal 51 av fran ringkammaren 46 och det instängda vattnet i ringkammaren 46 och styrkanalen 53 dämpar ventilens rörelse innan ventilen landar eftersom det byggs I Co 505 170 upp ett tryck mot styrytan A2. Genom att raden av stora borrningar 50 genom sliden ligger sa nära ringkammaren 46 kan det emellertid inte byggas upp ett tryck som äventyrar att sliden stannar stabilt i sitt främre läge. Läckaget ut genom halen 50 tillsammans med läckaget över slidens ände är nämligen större än läckaget in genom den stängda porten 53.During the last part of the forward movement of the slide, the two small halls 51 of the slide are closed off from the annulus 46 and the trapped water in the annulus 46 and the control channel 53 dampens the movement of the valve before the valve lands because a pressure builds up against the guide surface A2. However, because the row of large bores 50 through the slide is so close to the annular chamber 46, no pressure can be built up which endangers the slide remaining stable in its front position. Namely, the leakage out through the tail 50 together with the leakage over the end of the slide is greater than the leakage in through the closed port 53.

Sliden trycksätter nu det bakre cylinderrummet 26 via portarna 62,61 och 60 och kanalerna 59 mellan portarna 61 och 60 så att slagkolven 24 bromsas, vänder och gör sitt arbetsslag såsom redan beskrivits.The slide now pressurizes the rear cylinder space 26 via the ports 62, 61 and 60 and the channels 59 between the ports 61 and 60 so that the percussion piston 24 is braked, turned and makes its working stroke as already described.

Claims (5)

* 505 170 Patentkrav* 505 170 Patent claims 1. Sänkborrmaskin innefattande ett rörformigt hus (12) med en styrbussning (18) 1 husets främre ände anordnad att styra slagkolvens (24) främre ände och ett ventilhus (20) i husets bakre ände anordnat att styra slagkolvens bakre ände, kännetecknat av att styrbussningen (18), ventilhuset (20) och ett mellan dem befintligt distansrör (19) är gemensamt inspända mot ett stöd (13) för styrbussningen medelst ett i huset iskruvat bakstycke (22), varvid distansröret är sa avpassat att det axiellt sammanpressas minst 0.3 promille av sin längd när bakstycket skruvas fast.Submersible drilling machine comprising a tubular housing (12) with a guide bushing (18) at the front end of the housing arranged to control the front end of the percussion piston (24) and a valve housing (20) at the rear end of the housing arranged to control the rear end of the percussion piston, characterized in (18), the valve housing (20) and a spacer tube (19) between them are jointly clamped against a support (13) for the guide bushing by means of a back piece (22) screwed into the housing, the spacer tube being so adapted that it is axially compressed at least 0.3 per mille of its length when the back cover is screwed on. 2. Sänkborrmaskin enligt patentkrav 1, kännetecknad av att distansröret (19) är avpassat att sammanpressas minst 0.8 promille av sin längd.Submersible drilling machine according to Claim 1, characterized in that the spacer tube (19) is adapted to be compressed at least 0.8 per mille of its length. 3. Sänkborrmasin enligt patentkrav 2, kännetecknat av att distansröret (19) är avpassat att sammanpressas 0.8 - 3 promille av sin längd.Submersible drilling machine according to Claim 2, characterized in that the spacer tube (19) is adapted to be compressed 0.8 to 3 per mille of its length. 4. Sänkborrmaskin enligt nagot av föregående patentkrav, kännetecknad av ett element (21) mellan ventilhuset (20) och bakstycket (22) anordnat att axiellt sammanpressas minst 0.3 promille av sin längd.Submersible drilling machine according to one of the preceding claims, characterized by an element (21) between the valve housing (20) and the rear piece (22) arranged to be axially compressed at least 0.3 per mille of its length. 5. Sänkborrmaskin enligt patentkrav 4, kännetecknat av att sagda element (21) är ett filterstöd.Submersible drilling machine according to claim 4, characterized in that said element (21) is a filter support.
SE9304125A 1993-12-13 1993-12-13 Lowering drill with compressible spacer SE505170C2 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
SE9304125A SE505170C2 (en) 1993-12-13 1993-12-13 Lowering drill with compressible spacer
AU12866/95A AU685561B2 (en) 1993-12-13 1994-12-13 An in-hole rock drilling machine
DE69432312T DE69432312T2 (en) 1993-12-13 1994-12-13 STONE DRILLING MACHINE IN THE HOLE HOLE
ES95919251T ES2194910T3 (en) 1993-12-13 1994-12-13 ROCKS DRILLING MACHINE IN AGUJERO.
EP95919251A EP0733152B1 (en) 1993-12-13 1994-12-13 An in-hole rock drilling machine
KR1019960703110A KR100352883B1 (en) 1993-12-13 1994-12-13 Drilling rock drill
CA002178814A CA2178814C (en) 1993-12-13 1994-12-13 An in-hole rock drilling machine
JP51670395A JP3588467B2 (en) 1993-12-13 1994-12-13 Borehole drill
PCT/SE1994/001201 WO1995016848A1 (en) 1993-12-13 1994-12-13 An in-hole rock drilling machine
US08/664,905 US5715897A (en) 1993-12-13 1996-06-12 In-hole rock drilling machine with a hydraulic impact motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9304125A SE505170C2 (en) 1993-12-13 1993-12-13 Lowering drill with compressible spacer

Publications (3)

Publication Number Publication Date
SE9304125D0 SE9304125D0 (en) 1993-12-13
SE9304125L SE9304125L (en) 1995-06-14
SE505170C2 true SE505170C2 (en) 1997-07-07

Family

ID=20392073

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9304125A SE505170C2 (en) 1993-12-13 1993-12-13 Lowering drill with compressible spacer

Country Status (8)

Country Link
EP (1) EP0733152B1 (en)
JP (1) JP3588467B2 (en)
KR (1) KR100352883B1 (en)
AU (1) AU685561B2 (en)
DE (1) DE69432312T2 (en)
ES (1) ES2194910T3 (en)
SE (1) SE505170C2 (en)
WO (1) WO1995016848A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102852455A (en) * 2012-09-28 2013-01-02 李少江 Percussion drilling tool

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE507651C2 (en) * 1997-07-02 1998-06-29 Uniroc Ab Lowering drill with double driver areas for the stroke and return stroke of the piston
SE524153C2 (en) * 2001-12-21 2004-07-06 Atlas Copco Secoroc Ab Carriers for submersible hammer made of material softer than the material of the shaft
SE523946C2 (en) * 2001-12-21 2004-06-08 Atlas Copco Secoroc Ab Lowering drill hammer where the outer tube completely encloses a carrier
FR2876141B1 (en) 2004-10-06 2006-12-08 Sandvik Tamrock Secoma Sas Soc ROTOPERCUSSION FORTIFICATION DEVICE
WO2022229363A1 (en) * 2021-04-29 2022-11-03 Mincon International Limited Hydraulic down-the-hole hammer and subsea pile
SE2250739A1 (en) * 2022-06-17 2023-12-18 Lkab Wassara Ab Pressurized fluid-driven countersink drilling machine with a device for soft start from spool position and an impact piston included in such a countersink drilling machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1188526B (en) * 1962-11-23 1965-03-11 Beteiligungs & Patentverw Gmbh Compressed air operated deep hole drill

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102852455A (en) * 2012-09-28 2013-01-02 李少江 Percussion drilling tool

Also Published As

Publication number Publication date
SE9304125D0 (en) 1993-12-13
ES2194910T3 (en) 2003-12-01
AU1286695A (en) 1995-07-03
JP3588467B2 (en) 2004-11-10
AU685561B2 (en) 1998-01-22
DE69432312D1 (en) 2003-04-24
SE9304125L (en) 1995-06-14
KR100352883B1 (en) 2002-12-18
EP0733152B1 (en) 2003-03-19
WO1995016848A1 (en) 1995-06-22
JPH09506688A (en) 1997-06-30
DE69432312T2 (en) 2004-03-18
EP0733152A1 (en) 1996-09-25

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