SE188041C1

SE188041C1 -

Info

Publication number: SE188041C1
Authority: SE
Publication date: 1963-01-01

Description

KLASS INTERNATIONELLSVENSK E 21 c5b:8/i0 PATENT- OCH REGISTRERINGSVERKET Ans. 6903/1961 den 3/7 1961Hartill en ritning E 0 PERSSON, NALDEN Bergborranoraning Foreliggande uppfinning avser ett bergborrelement av den typ, i vilken en horrhallare ãr fOrhunden med en lopare, vilken tilldelas en fram.- och atergaende rorelse i ett hOlje medelst en utifran fram och tillbaka driven drivstang, som glidbart stracker sig in i 16- paren. CLASS INTERNATIONAL SWEDISH E 21 c5b: 8 / i0 PATENT AND REGISTRATION AGENCY Ans. The present invention relates to a rock drill element of the type in which a whore holder is for the dog with a runner, which is assigned a reciprocating motion in a housing by means of an outer member of the shaft.............................. reciprocating drive rod, which slidably extends into the 16-pair.

Vid hittills anvanda bergborrelement av denna typ overfOras drivstfingens rorelser fram och tillbaka till loparen medelst tva i motsatta riktningar verkande skruvfjadrar, som aro inspanda mellan ansatser pa drivstangen resp. lOparen. Darvid dampas dessutom loparens rorelser i holjet och aterfores loparen pa samma salt som drivkraften overfores fran drivstangen till loparen. Detta sail att overfOra och dampa drivkraften har emellertid avsevarda nackdelar. Bland annat kunna borrelement drivna pa detta salt med svarighet fas att utf6ra behovligt antal slag per tidsenhet. Dessutom bli fjadrarna, om de skola ha tillracklig styrka och livslangd, stora och tunga, vilket okar borrelementets dimensioner och kostnaderna fOr dess tillverkning. Detta ãr mycket ofordelaktigt, speciellt eftersom bergborrelementet enligt foreliggande uppfinning huvudsakligen är avsett for anvandning i borranordningar for hal med stora diametrar, vilka anordningar innehalla ett flertal borrelement. In rock drill elements of this type used hitherto, the movements of the drive shaft are transmitted back and forth to the impeller by means of two helical springs acting in opposite directions, which are clamped between projections on the drive rod resp. lOparen. In addition, the runner's movements are vaporized in the housing and the runner is returned to the same salt as the driving force is transferred from the drive rod to the runner. However, this sail to transfer and vaporize the driving force has significant disadvantages. Among other things, drilling elements driven on this salt can be performed with the required number of strokes per unit of time. In addition, the springs, if they are to have sufficient strength and service life, become large and heavy, which increases the dimensions of the drilling element and the costs of its manufacture. This is very disadvantageous, especially since the rock drilling element according to the present invention is mainly intended for use in drilling devices for slides with large diameters, which devices contain a plurality of drilling elements.

De ovan anfOrda nackdelarna undanrojas enligt fOreliggande uppfinning i huvudsak darigenom, att drivstangens rorelser overforas till loparen och dennas darigenom erhallna rOrelser dampas och aterforas medelst tryckfluidumkuddar, vilka i drivstingens °eh 16- parens hada rorelseriktningar aro inneslutna i utrymmen mellan drivstangen och loparen resp. mellan loparen och holjet, varvid vart och ett av dessa utrymmen under storre delen av drivstangens resp. loparens slag frau sina medellagen i riktning mot resp. utrymme är allsidigt fluidumtatt tillslutet. The above-mentioned disadvantages are eliminated according to the present invention mainly in that the movements of the drive rod are transmitted to the runner and its movements thereby obtained are vaporized and returned by means of pressure fluid pads, which in the drive pairs and 16 pairs have movement directions in the space between the drive rod and the bar. between the runner and the housing, each of these spaces under the greater part of the drive rod resp. the runner's blow from his middle layers in the direction of resp. space is versatile fluid taken closed.

Darvid ãr drivstangena i loparen inkjutande del lampligen utformad med en skivformad flans, som ãr glidhar i ett eylindriskt halrum i loparen under tatning mot halrummets vagg, varvid utrymmena for de drivstangens rorelser overforande tryckfluidumkuddarna aro belagna pa den skivformade flansens bada sidor. In this case, the drive rods in the runner projecting part are suitably formed with a disc-shaped flange, which slides in a cylindrical cavity in the runner while sealing against the cradle wall, the spaces for the movements of the drive rod movements facing the pressure fluid cushions being coated on the bath-shaped side flange.

Pa liknande salt liar den del av loparen., som innesluter hidrummet, formen av en kolvliknande utvidgning, vilken ãr glidbart anordnad i en cylinderformad kammare i holjet under tatning mot dennas vagg, varvid de utrymmen, som innesluta de loparens rorelser dampande och loparen aterfOrande fluidumkuddarna aro belagna i den cylinderformade kammaren pa bada sidor om loparens kolvliknande utvidgning. On a similar salt, the part of the runner enclosing the space is in the form of a piston-like extension, which is slidably arranged in a cylindrical chamber in the housing while sealing against its cradle, the spaces enclosing the runners' movements vaporizing and the runner returning the fluid pads. are located in the cylindrical chamber on both sides of the piston-like extension of the runner.

Ytterligare en fordel med overforingen av drivkraften och dampningen av de rorliga delarna enligt uppfinningen uppnas genom att en tryckfluidumkudde har en fordelaktigare fjaderkarakteristik an en normal skruvfj ader. Den sistnamnda uppvisar en i det narmaste ratlinjig fjaderkurva, dvs fjaderkraften ãr direkt proportionell mot fjaderns sammantryckning. Vid en. tryckfluidumkudde blir daremot fjaderkraftens Okning per enhet fjadringslangd storre ju storre den totala fjadringslangden hr. Foljden blir att de rorliga delarnas levande kraft vid slagrorelsens bOrjan ej minskas sâ mycket, soul vid en skruvfjader. Dessutom kommer den harmo:- niska svangningsrorelse, som drivstangen utfar, ej att distorderas i sa h8g grad av dampningen medelst tryckfluidumkuddar, som f al-let ãr, nar skruvfjadrar anvandas. A further advantage of the transmission of the driving force and the steaming of the movable parts according to the invention is achieved in that a pressure fluid cushion has a more advantageous spring characteristic than a normal coil spring. The latter has an almost linear linear spring curve, ie the spring force is directly proportional to the compression of the spring. By a. pressure fluid cushion, on the other hand, the increase in spring force per unit of suspension length becomes greater the greater the total suspension length hr. The consequence is that the living force of the moving parts at the beginning of the stroke is not reduced so much, soul at a helical spring. In addition, the harmonic oscillating motion emitted by the drive rod will not be distorted to such an extent by the steaming by means of pressure fluid pads, as is the case when coil springs are used.

En utforingsform av uppfinningen kommer i del fOljande att i detalj beskrivas under hanvisning till bifogade ritning, vilken i en axialsektion visar ett bergborrelement enligt uppfinningen. An embodiment of the invention will be described in detail in the following with reference to the accompanying drawing, which in an axial section shows a rock drill element according to the invention.

Bergborrelementet drives medelst en ej vi-sad drivanordning, lampligen i form av en lank- och excentermekanism, vilken tilldelar en drivstang 1 en fram- och kergaende, harmonisk svangningsrOrelse. Drivstangen 1 2— stracker sig glidbart genom en rorformad llipare 2, vilken i sin mot drivstangens 1 drivna ande motsatta ande är stelt forbunden med en borrhallare 3, i vilken en bergborr av kant utforande är fastbar. Loparen 2 och borrhallaren 3 kunna om sa onskas vara utforda i ett styeke. The rock drill element is driven by means of a drive device (not shown), suitably in the form of a longitudinal and eccentric mechanism, which assigns a drive rod 1 a forward and reciprocating, harmonic pivoting movement. The drive rod 1 2— extends slidably through a tubular grinder 2, which in its spirit opposite to the drive rod of the drive rod 1 is rigidly connected to a drill holder 3, in which a rock drill of edge design is fixed. The runner 2 and the drill holder 3 can, if desired, be challenged in a styeke.

Drivstangen 1 stracker sig glidbart genom 18parens 2 hal, varvid tatningsanordningar aro anordnade mellan drivstangen och lOparen. Pa den del av drivstangen 1, som inneslutes i 18paren 2 finnes en skivformad flans 4, vilken är glidbar fram och tillbaka i ett cylindriskt halrum 5 i en utvidgning 6 av iliparen. Menai' den skivformade flansens 4 kant och halrummets innervagg aro tatningsringar 7 anordnade, vilka ha till uppgift att fluidumtatt avskilja de utrymmen 8 och 9 av halrummet 5, som aro belagna pa vardera sidan av den skivformade flansen 4. En eller fiera tryckfluidumkanaler 10, vilkas uppgift kommer att anges i det foljande, stracka sig genom halrummets 5 vagg vinkelratt mot denna. The drive rod 1 slidably extends through the hall of the pair 18, wherein sealing devices are arranged between the drive rod and the pair. On the part of the drive rod 1, which is enclosed in the pair 18, there is a disc-shaped flange 4, which is slidable back and forth in a cylindrical cavity 5 in an extension 6 of the pair. The edge of the disc-shaped flange 4 and the inner cradle of the cavity are provided with sealing rings 7, which have the task of fluidly separating the spaces 8 and 9 of the cavity 5, which are covered on each side of the disc-shaped flange 4. One or more pressure fluid channels 10, the information will be given in the following, extending through the cradle of the cavity 5 perpendicular to it.

Loparens 2 rorformade delar aro glidbart fOrskjutbara i ett rorformat holje 11, under det att dess utvidgning 6, som innesluter halrummet 5, är glidbar i en cylindrisk kammare 13, vilken bildas av en del av holjet med storre invandig diameter. Loparens 2 rorformade delar aro tatade mot holjets 11 innervaggar medelst tatningsringar. The tubular parts of the runner 2 are slidably displaceable in a tubular housing 11, while its extension 6, which encloses the cavity 5, is slidable in a cylindrical chamber 13, which is formed by a part of the housing with a larger inner diameter. The rudder-shaped parts of the runner 2 are tattooed against the inner cradles of the housing 11 by means of sealing rings.

Utvidgningen 6 har formen av en cylindrisk kolv och kammaren 13 omsluter denna som en cylinder, varvid utvidgningen uppdelar kammaren i tva kolvrum 14 och 15 pa vardera sidan av utvidgningen. Intill utvidgningens 6 andytor arc tatningar 16 och 17 anordnade mellan utvidgningens 6 mantelyta °eh kammarens 13 innerv5.gg. Tv. tryckfluidumkanaler 18 och 19 stracka sig vinkelratt genom kammarens 13 vagg i sadana axiella lagen, att den kolvliknande utvidgningen 6 under sin r8relse fram och Ater i kammaren 13 frilagger den i rorelseriktningen bakre tryckfluidumkanalens mynning in till kammaren alldeles innan loparen 2 uppnatt silt andlage I denna rorelseriktning. Avsikten harmed kommer att narmare forklaras i det fed- jande. The extension 6 has the shape of a cylindrical piston and the chamber 13 encloses it as a cylinder, the extension dividing the chamber into two piston spaces 14 and 15 on each side of the extension. Adjacent to the outer surfaces of the extension 6 arc seals 16 and 17 arranged between the outer surface of the extension 6 and the inner surface of the chamber 13. TV. pressure fluid channels 18 and 19 extend perpendicularly through the cradle of the chamber 13 in such axial layers that the piston-like extension 6 during its forward and rearward movement in the chamber 13 exposes the orifice rear pressure fluid channel mouth into the chamber just before the runner 2 reaches this direction. . The intention with this will be explained in more detail in the fattening.

Det ovan beskrivna bergborrelementet är i sin helhet inskjutbart i en rorformad hallare 20, i vilken det fasthalles medelst bultar 21, som stracka sig genom en flans 22 pa holjet. Hallaren 20 omsluter h8ljet 11 och Was medelst tatningsringar. Borrelementet kan salunda mycket latt insattas och uttagas ur hallaren 20, och spalterna for tillforsel av tryckfluidum och smorjolja kunna latt astadkommas genom enkla insvarvningar eller genom att hallarens 20 innerdiameter är nagot storre an holjets 11 ytterdiameter, varvid tatningsringarna mellan dem tjana som distansorgan. The rock drill element described above can be slid in its entirety into a tubular holder 20, in which it is held by means of bolts 21, which extend through a flange 22 on the housing. The holder 20 encloses the housing 11 and Was by means of sealing rings. The drilling element can thus be very easily inserted and removed from the holder 20, and the gaps for supplying pressure fluid and lubricating oil can be easily created by simple turns or by the inner diameter of the holder 20 being slightly larger than the outer diameter of the housing 11, the sealing rings between them serving as spacers.

Den i det foregaende beskrivna anordningen verkar pa foljande satt: Vid borrningens igangsattande tillfores tryckfluidum, lampligen tryckluft, till borrelementet. Tryckluften inledes genom en kanal 23, som stracker sig vinkelratt genom hallarens 20 vagg mitt for kammaren 13 i holjet 11, och strommar genom en ringformad spalt 24, som bildas av spelrummet mellan hallaren och holjet och i axiell led begransas av tatningsringar mellan dessa element. Tryckfluidumkanalerna 18 och 19 i kammarens 13 vagg mynna likaledes i spalten 24 och leda till annu en ringformad spalt 25 mellan kammarens 13 innervagg och yttervaggen till loparens 2 utvidgning 6, vilken spalt 25 i axiell led begransas av tatningarna 16 och 17. De yttre andarna av tryckfluidumkanalerna 10 i halrummets 5 vagg mynna likaledes i denna span 25. The device described above operates in the following way: At the start of the drilling, pressure fluid, suitably compressed air, is supplied to the drilling element. The compressed air is introduced through a channel 23, which extends perpendicularly through the cradle of the holder 20 in front of the chamber 13 in the housing 11, and flows through an annular gap 24, which is formed by the clearance between the holder and the housing and is axially bounded by sealing rings between these elements. The pressure fluid channels 18 and 19 in the cradle of the chamber 13 likewise open into the gap 24 and lead to another annular gap 25 between the inner cradle of the chamber 13 and the outer cradle to the extension 6 of the runner 2, which gap 25 is axially bounded by the seals 16 and 17. the pressure fluid channels 10 in the cradle of the cavity 5 likewise open in this span 25.

Nar drivstangen 1 f8rsattes i rorelse av sin utvandiga drivanordning, forskjutes den skivformade flansen 4 fram och tillbaka 1 halrummet 5 och darvid sattes vid vane slag det i rorelseriktningen bakre utrymmet 8 eller 9 av halrummet 5 genom kanalen 23, spalten 24, kanalerna 18, 19 samt spalten 25 i forbindelse med tryckfluidunikanalerna 10 ocli ett tryck uppbygges i utrymmena. 8 och 9. De darvid bildade tryckluftkuddarna overfora drivstangens rorelser till lOparen 2, som darigenom Virsattes i en fram- och atergd.ende rOrelse i holjet 11. Under denna rorelse frilagger loparens 2 utvidgning 6 under varje slag mynningen till den i rorelseriktningen bakre kanalen 18 resp. 19, sa att tryckfluidum genom kanalen 23 och spalten 24 ledes till kanalerna 18 resp. 19 saint ett tryck uppbygges i motsvarande kolvrum 14 resp. 15, varigenom luftkuddar f8r dampning av loparens 2 rorelser bildas. When the drive rod 1 is moved in motion by its external drive device, the disc-shaped flange 4 is displaced back and forth in the cavity 5 and thereby, as usual, the rear space 8 or 9 of the cavity 5 is moved in the direction of movement through the channel 23, gap 24, channels 18, 19 and the gap 25 in connection with the pressure fluid channels 10 and a pressure is built up in the spaces. 8 and 9. The compressed air cushions thus formed transmit the movements of the drive rod to the runner 2, which is thereby moved in a forward and reciprocating motion in the housing 11. During this movement, the extension 6 of the runner 2 during each stroke exposes the mouth to the rear channel 18 in the direction of movement. resp. 19, so that pressure fluid through the channel 23 and the gap 24 is led to the channels 18 and 18, respectively. 19 saint a pressure is built up in the corresponding piston chamber 14 resp. 15, whereby air cushions for steaming the runners' 2 movements are formed.

Saledes tillfOres tryckfluidet f Or riirelseoverforingen °eh dampningen endast genom kanalen 23 och strommar genom spalten 24, kanalerna 18, 19, spalten 25 samt kanalen 10 och fordelas genom rorelserna has borrelementets delar till de for desamma avsedda utrymmena. Samtidigt bibehalles aven det 8nskade lufttrycket i dessa utrymmen genom att Tart och ett av dem under varje slag sattes i farbindelse med tryckfluidumkallan, sa att eventuellt utlackt tryckfluidum ersattes. Thus, the pressure fluid for the transfer of the transfer or the vapor is supplied only through the channel 23 and flows through the gap 24, the channels 18, 19, the gap 25 and the channel 10 and is distributed through the movements having the parts of the drilling element to the spaces intended for them. At the same time, the desired air pressure in these spaces is also maintained by placing Tart and one of them in contact with the pressure fluid source during each stroke, so that any leached pressure fluid is replaced.

F8r att forhindra att borren vid avbrott tryckmedinmsystemet eller nar borrningsarbetet skall upphora och tryckfluidumtillforseln avbrytes av sin egen vikt skall foras till anliggning mot borrstallet och forhindra borranordningens utdragning ur borrhalet, Or borrelementet enligt uppfinningen forsett med en anordning, som vid avbrott i tryckfluidumtillforseln automatiskt lyfter loparen 2, borrhallaren 3 och darmed borren ur angreppslaget. — —3 Denna anordning innefattar annu en cylindrisk kammare 26 i holjet 11, som är koaxiell med kammaren 13 och omsluter loparens 2 rorformade del. I det ringrum, som bildas mellan kammarens 26 vagg och. loparen 2 ãr ett kolvorgan 27 glidbart forskjutbart under tatning saval mot kammarvaggen som mot loparen. Kolvorganet 27 har ringform och fran dess ena andyta stracker sig en ringformad fordjupning 28 axiellt in till i narheten av motsatta andyta. Denna ringformade fordjupning 28 upptager en tryckfjader 29, som med sin ena ande anligger mot fordjupningens 28 botten medan dess andra ande stOder mot kammarens 26 ena andyta. Nar borrningsarbetet skall paborjas inpressas tryckfluidum I kammaren 26 Over kolvorganets obrutna andyta och detta tryckfluidum pressar kolvorganet 27 mot kraften fran fjadern 29 till anliggning mot den andyta av kammaren 26, som bildar god fOr fjadern 29. Nar borrningsarbetet avbrytes, sjunker trycket i kammaren 26 och fjadern 29 formar pressa kolvorganet 27 i motsatt riktning mot borrningsriktningen. Denna forskjutning av kolvorganet 27 sker utan hinder ett stycke, till dess anliggning mot en ringformad flans 30 pa loparens 2 rorformade del uppnas. Vid kolvorganets 27 fortsatta forskjutning medbringas loparen 2 medelst ringflansen 30 och darmed fOrskjutes borren sa att borranordningen kan fOrflyttas i borrhalet utan att borren hindrar denna rorelse. Nar borrningsarbetet Ater igangsattes intranger tryckrnedium Ater i kammaren 26 och pressar kolvorganet 27 mot kraften av fjadern 29, sa. att borren av sin egen vikt kan aterforas till arbetslage. In order to prevent the drill from being interrupted by the pressure medium system or when the drilling work is to cease and the pressure fluid supply is interrupted by its own weight, it must be brought into abutment against the drill stall and prevent the drilling device from being pulled out of the drill tail. 2, the drill bit 3 and thus the drill from the attack layer. This device further comprises a cylindrical chamber 26 in the housing 11, which is coaxial with the chamber 13 and encloses the tubular part of the runner 2. In the annulus formed between the cradle 26 and the chamber 26. the runner 2 is a piston member 27 slidably displaceable during sealing saval against the chamber cradle as against the runner. The piston member 27 has an annular shape and from its one end surface an annular depression 28 extends axially into the vicinity of opposite end surfaces. This annular recess 28 receives a compression spring 29, which with one end abuts against the bottom of the recess 28 while its other end abuts against one end of the chamber 26. When the drilling work is to be drilled, pressure fluid is pressed into the chamber 26. the spring 29 forms to press the piston member 27 in the opposite direction to the drilling direction. This displacement of the piston member 27 takes place without hindrance a distance, until its abutment against an annular flange 30 on the tubular part of the runner 2 is achieved. In the further displacement of the piston member 27, the runner 2 is brought along by the ring flange 30 and thus the drill is displaced so that the drilling device can be moved in the drill tail without the drill preventing this movement. When the drilling work Ater was started, the pressure medium Ater intrudes into the chamber 26 and presses the piston member 27 against the force of the spring 29, said. that the drill of its own weight can be returned to the working class.

Om del ovan beskrivna borrelementet anvandes i en anordning for upptagning av stora hal i marken, i vilket ett antal borrelement are anordnade runt mantelytan av ett koniskt borrhuvad och angriper halets vagg i vinkel mot huvudborriktningen, kan den ovan beskrivna anordningen for att lyfta borren ur ingrepp ersattas med en mekanism, som vrider borren kring dess axel, sh att mejselskaret intau°er ett lage parallellt med borrhalets tangent. Darigenom bringas mejselskarets vid borrningen yttre kant ur ingrepp med halets Tagg och borrhuvudet kan fritt lyftas ur borrhalet. If part of the drilling element described above is used in a device for receiving large slides in the ground, in which a number of drilling elements are arranged around the mantle surface of a conical drill head and engage the cradle of the tail at an angle to the main drilling direction, the above-described device can lift the drill. is replaced by a mechanism which rotates the drill about its axis, so that the chisel vessel occupies a bearing parallel to the key of the drill tail. As a result, the outer edge of the chisel vessel during drilling is brought out of engagement with the tip of the tail and the drill head can be freely lifted out of the drill tail.

Drivanordningen är forbunden med drivstangen 1 Over en koppling, lampligen en hydraulisk koppling, som Or sa. konstruerad, att den tillslas fOrst sedan tryckfluidet uppnatt det for borrningsarbetet Midvandiga trycket. The drive device is connected to the drive rod 1 Over a coupling, possibly a hydraulic coupling, as Or said. designed so that it is switched on only after the pressure fluid has reached the Midvandiga pressure for drilling work.

DO hergborrelement av den beskrivna typen oftast masts arbeta under mycket svara fOrhallanden, I. ex. standigt omgivna av spolvatten, stallas mycket hoga krav pa tatningen mellan elementets olika delar och smorj ningen av dess i ,forhMlande till varandra rorliga delar. DO herb drill elements of the type described usually have to work under very similar conditions, I. ex. constantly surrounded by flushing water, very high demands are placed on the seal between the various parts of the element and the lubrication of its parts, which are movable relative to each other.

I den beskrivna utforingsformen aro saintliga tatningar ringformade. Darvid bildas tatningen mellan vardera tva delar av borrelementet av ett eller flera par tatningsringar. Dessa par tatningsringar bilda de axiella begransningarna till ringformade spalter mellan delarna, vilka till formen Overensstamma med spalterna 24 och 25. Enligt uppfinningen inledes olja under tryck till dessa ringformade spalter, varTid oljan lam.pligen infores genom en inloppskanal 31 genom hallarens 20 vagg till en av dessa spalter. Fran denna spalt fordelas sedan den under tryck staende oljan genom kanaler i holjet 11, loparen 2 och drivstangen 1 till de olika ringformade spalterna. Denna mellan de parvis anordnade tatnin.gsringarna infilSrda hogtryekta oljan bidrager avsevart till att astadkomma en tillfredsstallande tatning saval mot utifran intrangande vatten och fororeningar, som mot stromning av tryckfluidum mellan borrelementets olika utrymmen for detta. Samtidigt astadkommes Oven en mycket god smorjning av borrelem.entets olika glidytor, nar dessa oljefyllda spalter Elms fram och tillbaka over desamma. Del tryckfluidum, som lacker in i de oljefyllda spalterna eller overfores till dessa, nor tatningarna pa den skivformade Hansen 4 eller den kolvliknande utvidgningen 6 lotus forbi tryckfluidumkanalerna 10 resp. 18 och 19, bortledes med oljestrommen, som bortkdes Iran borrelementet genom en eller flera utloppskanaler 32, 33. In the embodiment described, saintly seals are annular. In this case, the seal between each two parts of the drilling element is formed by one or more pairs of seal rings. These pair of sealing rings form the axial boundaries of annular gaps between the parts, which in shape correspond to the gaps 24 and 25. According to the invention, oil is introduced under pressure to these annular gaps, whereby the oil is normally introduced through an inlet channel 31 through the cradle 20 to a of these columns. From this gap, the pressurized oil is then distributed through channels in the housing 11, the runner 2 and the drive rod 1 to the various annular slots. This high-pressure oil infiltrated between the sealing rings arranged in pairs significantly contributes to achieving a satisfactory sealing against water intruding and contaminants, as against the flow of pressure fluid between the different spaces of the drilling element therefor. At the same time, Oven achieves a very good lubrication of the various sliding surfaces of the drill element, when these oil-filled gaps Elms back and forth over them. Part of the pressure fluid which licks into the oil-filled gaps or is transferred to them, the grooves on the disc-shaped Hansen 4 or the piston-like extension 6 lotus past the pressure fluid channels 10 resp. 18 and 19, is discharged with the oil stream, which was removed from the drilling element through one or more outlet channels 32, 33.

Enligt vad som ovan visas astadkommes enligt uppfinningen ett konstruktivt relativt enkelt borrelement, som uppvisar de inledningsvis angivna fordelarna och vilket kan arbeta med mycket Mgt antal slag per tidsenhet. Den beskrivna utforingsformen far dock ej uppfattas corn begransande for uppfinningen, utan utgor endast ett exempel ph hur denna kan forverkligas. According to what is shown above, according to the invention a constructively relatively simple drilling element is provided, which has the advantages stated in the introduction and which can work with a very large number of strokes per unit of time. However, the described embodiment may not be construed as limiting the invention, but constitutes only an example of how this may be realized.

Claims

Patent claim Ak:

A rock drilling device of the type in which a drill holder is connected to a runner, which is assigned a reciprocating movement in a housing by means of a reciprocating drive rod, which slidably extends into the runner, characterized in that the drive rod (1) movements are transmitted to the runner (2) and the movement thus obtained is vaporized and returned by means of pressure fluid pads, which in the direction of movement of the drive rod and the runner are enclosed in spaces (8, 9 and 14, 15) between the drive rod (1) and the runner. (2) resp. between the runner (2) and the cover (11), Tarvid Tart and one of these spaces. (8, 9 resp. 14, 15) under the greater part of the drive rod resp. runner's blow Iran 4— - its average laws in the direction of resp. space is versatile fluid taken closed.

Rock drilling device according to claim 1, characterized in that the push-in part of the drive rod (1) in the runner (2) is formed with a disc-shaped flange (4), which is slidable in a cylindrical cavity (5) in the runner during sealing (7) against the cradle of the cavity, the spaces (8, 9) for the movements of the drive rod facing the pressure fluid cushions being coated on both sides of the disc-shaped flange (4).

Rock drilling device according to claim 2, characterized by at least one channel (10) arranged in the cylindrical cradle of the cavity (5), the mouth of which to the cavity at the movements of the drive rod (1) is exposed to the rear space (8, 9) of the drive rod (5) for building up pressure and ers5.ttan.deair leached pressure fluid in this space at the stroke of the drive rod.

Rock drilling device according to claims 1 and 2, characterized in that the part of the runner (2) enclosing the cavity (5) has the shape of a piston-like extension (6), which is slidably arranged in a cylindrical chamber (13) in the housing (11) under sealing (16, 17) against its cradle, the spaces (14, 15) enclosing the movements of the runners (2) vaporizing and re-conducting the fluid pads being located in the cylindrical chamber (13) on both sides of the runner ( 2) piston-like extension (6).

Rock drilling device according to claim 4, characterized in that the cradle of the cylindrical chamber (13) is provided with at least one penetrating pressure fluid channel (18, 19) which is coated, that the piston-like extension (6) of the barrel - at its stroke - places the chamber (13) in the direction of movement of the runner's rear space (14 or 15) in connection with the corresponding duct (18 or 19) for building up air pressure and replacing leached back pressure fluid in this space.

Rock drilling device according to claims 8 and 5, characterized by a ring socket (16, 17) at each end of the piston-like extension (6) of the LOPar (2) between the denim and the cradle to the chamber (13) of the housing (11), wherein it the conduit (10) leading to the cavity (5) opens into the space (25) between these ring seals and is supplied with pressure fluid. Over this space from the pressure fluid channels (18, 19) leading to the chamber (13).

Rock drilling device according to any one of the preceding patent claims, characterized in that the casing (11) with some clearance (24) is arranged in a tubular holder (20), the fluid supply to channels or the channels (18, 19) to the cylindrical chamber (13) of the casing. ) takes place from the clearance (24) between the housing (11) and the holder (20).

Rock drilling device according to any one of the preceding claims, characterized in that the housing (11) comprises a further cylindrical, with the first-mentioned chamber (13) coaxial chamber (26), which encloses a spring-loaded (29), annular piston means (27), enclosing the runner (2) and during operation of the drilling element Mlles depressed against the spring force of pressure fluid initiated in the chamber (26), but when the supply of pressure fluid to the rock drilling device is interrupted and the pressure in the chamber (26) drops, the spring force (29) is shifted to abut against a approach (30) on the 15 pairs (2) and bring denim and the drill bit (3), so that the drill is displaced away from the attack layer.

Rock drilling device according to any one of patent claims 1-7, characterized by an axial guide Indian drive rod (1) and the runner (3), which prevents relative rotation between them, saint a device for turning the drive rod (1), whereby a chisel-shaped drill bit can be brought out of active contact with the surrounding mountain.

Rock drilling device according to any one of the preceding patent claims, characterized in that the seals between the drive rod (1) and the runner (2), the disc-shaped flange (4) of the drive rod and the cradle (11) of the cavity (5), the runner's piston-like extension (6) ) and the first chamber (13) of the housing, the housing and the holder (20) and the piston member (27) and the second chamber of the housing reap. lOperen all best & air arranged sealing rings in pairs, whereby oil under pressure is pressed into the clearances Indian these sealing rings to lubricate the sliding surfaces of the drilling element and improve the sealing. Cited publications: