NO754273L

NO754273L -

Info

Publication number: NO754273L
Application number: NO754273A
Authority: NO
Inventors: N A Agren; C-G Bergstroem; K E O Bystroem; B Hoegstroem
Original assignee: Atlas Copco Ab
Priority date: 1974-12-23
Filing date: 1975-12-16
Publication date: 1976-06-24
Also published as: CA1042416A; SE395744B; DE2557338A1; SE7416214L; AU505055B2; AU8776975A; FR2296084B3; ZA757906B; FI753621A; FR2296084A1

Description

Foreliggende oppfinnelse vedrører en fremgangs- The present invention relates to a process

måte for innretting av en med en maskinelt matet fjellbore- way of aligning a with a machine-fed rock drill-

maskin forsynt med matningsbjelke til en ønsket boreretning, hvorved matningsbjelken svinges i forhold til en samme bærende bom, machine equipped with a feed beam for a desired drilling direction, whereby the feed beam is swung in relation to the same supporting boom,

og bommen dreies og/eller svinges relativt et bommen bærende stativ ved hjelp av over leddaksler leddbart koplede hydrau- and the boom is turned and/or swung relative to a stand supporting the boom by means of articulated hydraulic

liske sylinder, og en anordning for fremgangsmåtens utførelse. lish cylinder, and a device for carrying out the method.

Ved boring er det viktig at matningsbjelken When drilling, it is important that the feed beam

enkelt og korrekt kan innstilles i ønskede stillinger. Videre er det, såvel ved tunneldriving som pallsprengning av største betydning at ved siden av hverandre utførte borehull løper parallelt med hverandre. can be easily and correctly set in desired positions. Furthermore, both for tunneling and pallet blasting, it is of the greatest importance that boreholes made next to each other run parallel to each other.

Konstruksjoner for automatisert innstilling av en matningsb jelke til forskjellige bore.stillinger. og for parallell-føring av en matningsbjelke mellom forskjellige bprestillinger er tidligere kjent. Svensk patent 349.350 viser en anordning for automatisk innstilling og/eller parallellføring av en matningsbjelke. Ved denne anordning er organer anordnet for automatisk innstilling av matningsbjelken i en bestemt bæring og en bestemt vinkel i forhold til loddlinjen. Svensk patent 364.091 viser en borebom med et selvkorrigerénde elektrohydraulisk vinkel-stillingsservosystem for parallellføring av matningsbjelken mellom forskjellige borestillinger. Borebommer med rent hydrauliske eller rent mekaniske parallellføringsmidler er likeledes tidligere kjent. Constructions for automated adjustment of a feed beam to different drilling positions. and for parallel running of a feed beam between different bperformances is previously known. Swedish patent 349,350 shows a device for automatic setting and/or paralleling of a feed beam. With this device, means are provided for automatic setting of the feed beam in a specific bearing and a specific angle in relation to the plumb line. Swedish patent 364,091 shows a drilling boom with a self-correcting electro-hydraulic angular position servo system for paralleling the feed beam between different drilling positions. Drill booms with purely hydraulic or purely mechanical parallel guide means are also previously known.

Formålet med foreliggende oppfinnelse er å tilveiebringe et forenklet indikeringssystem for borebomsvinklene. The purpose of the present invention is to provide a simplified indication system for the drill boom angles.

Ved f.eks. skifting av borkrone skal det være mulig bare By e.g. changing the drill bit should only be possible

å tippe matningsbjelken og etter skiftingen føre matningsbjelken nøyaktig tilbake til den foregående stilling. Ved parallellhullsboring skal det være mulig å føre matningsbjelken ut av den parallelle stilling, f.eks. for boring av stikningshull, og deretter tilbakeføre matningsbjelken til overensstemmelse med de parallelle hullers retning. Systemet kan også med fordel anvendes som komplement til konvensjonelle parallellføringsbommer. Ved disse finnes geometriske og/eller hydrauliske feil. Med foreliggende oppfinnelse oppnås en forbedret nøyaktighet ved flytning av bommen. Ved hydraulisk parallellføring hender det ofte at operatøren ufrivillig kommer til å føre matningsbjelken ut av den riktige stilling. En innjustering av matningsbjelken. til denne stilling er både tidsødende og unøyaktig.. Med foreliggende system som komplettering til den hydrauliske parallell-føringen medfører en sådan ufrivillig retningsavvikelse ikke noe problem. to tip the feed beam and after the shift bring the feed beam exactly back to the previous position. When drilling parallel holes, it must be possible to move the feed beam out of the parallel position, e.g. for drilling pinholes, and then returning the feed beam to match the direction of the parallel holes. The system can also be advantageously used as a complement to conventional parallel guidance booms. These have geometric and/or hydraulic errors. With the present invention, an improved accuracy is achieved when moving the boom. With hydraulic parallel guidance, it often happens that the operator involuntarily moves the feed beam out of the correct position. An adjustment of the feeding beam. to this position is both time-consuming and inaccurate. With the present system as a complement to the hydraulic parallel guide, such an involuntary directional deviation does not cause any problem.

Disse og andre formål er oppnådd ved at oppfin-. nelsen har fått de i patentkrayene angitte kjennetegn. These and other purposes have been achieved by inventing. nelsen has received the characteristics specified in the patent claims.

Ytterligere utmerkende trekk ved oppfinnelsen fremgår av etterfølgende beskrivelse under henvisning til tegningene, på hvilke to utførelsesformer av oppfinnelsen vises som eksempel. Disse utførelsesformer er bare bestemt til å illustrere, oppfinnelsen som kan modifiseres på mange måter innen oppfin-nelsens ramme. Further outstanding features of the invention appear from the following description with reference to the drawings, in which two embodiments of the invention are shown as examples. These embodiments are only intended to illustrate the invention which can be modified in many ways within the scope of the invention.

På tegningene viser fig. 1 et sideriss av en borebom ifølge oppfinnelsen, fig. 2 er et forstørret snitt av et vinkel-avfølingsredskap for avføling av borebommens svingningsvinkler om vertikale leddaksler, fig. 3 viser monteringen av visere for den verdi sidevinklene bør ha, fig. 4 viser skjematisk systemet f<p>r indikering. av bommens sidevinkler og loddvinkel, og fig. 5 viser sett ovenfra en annen utførelsesform av en borebom ifølge oppfinnelsen. In the drawings, fig. 1 a side view of a drilling boom according to the invention, fig. 2 is an enlarged section of an angle sensing tool for sensing the drilling boom's swing angles about vertical joint shafts, fig. 3 shows the installation of pointers for the value the side angles should have, fig. 4 schematically shows the system for indication. of the boom's side angles and plumb angle, and fig. 5 shows, seen from above, another embodiment of a drilling boom according to the invention.

På fig. 1 vises en. borebom 10 omfattende en utliggerbom 11 som ved endene er leddet til mellomstykker 14, 15 over horisontale leddaksler 12, 13. Mellomstykket 14 danner del av et bomfeste 17. Det motsatte rriellomstykke 15 bærer en konvensjo nell matningsbjelke 20 på hvilken er glidbart styrt en. fjellboremaskin .22 som mates maskinelt f.eks. ved hjelp av en matnings-skrue og. matningsmotor 2 3 for denne. In fig. 1 is displayed a. drilling boom 10 comprising a cantilever boom 11 which is connected at the ends to intermediate pieces 14, 15 over horizontal joint shafts 12, 13. The intermediate piece 14 forms part of a boom mount 17. The opposite rriellom piece 15 carries a conventional feed beam 20 on which is slidably guided a. rock drill .22 which is fed mechanically, e.g. by means of a feeding screw and. feed motor 2 3 for this.

Over bomfestets 17 horisontale leddaksel 12 er leddbart koplet en høydevinkelhydraulisk sylinder 24 som strekker seg mellom utliggerbommens 11 mellomparti og den nedre Above the horizontal articulated shaft 12 of the boom mount 17, an elevation angle hydraulic cylinder 24 is articulated and extends between the middle part of the boom 11 and the lower

ende av mellomstykket 14.' Ved forlengelse eller innkorting av sylinderen 2 4 kan man innstille utliggerbommens 11 høydevinkel end of the intermediate piece 14.' By extending or shortening the cylinder 2 4, the elevation angle of the outrigger boom 11 can be adjusted

i forhold til bomfestet 17 ved leddakselen 12. En høydevinkel-hydraulisk sylinder 25 er også koplet over matningsbjelkens 20 horisontale leddaksel 13 og strekker seg fra et mellomparti av utliggerbommen 11 til mellomstykket 15. Ved forlengelse in relation to the boom mount 17 at the joint shaft 12. An elevation angle hydraulic cylinder 25 is also connected over the horizontal joint shaft 13 of the feed beam 20 and extends from an intermediate part of the outrigger boom 11 to the intermediate piece 15. In the case of extension

eller innkortning av sylinderen 25 kan man-innstille mellom-stykkets og altså også matningsbjelkens høydevinkel i forhold or shortening of the cylinder 25, the height angle of the intermediate piece and thus also of the feed beam can be set in relation to

til utliggerbommen 11 ved leddakselen 13. to the outrigger boom 11 at the joint shaft 13.

På motsatt side av utliggerbommen 11 i forhold On the opposite side of the outrigger boom 11 in relation

til høydevinkelsylinderen 24 er leddbart koplet en hydraulisk pilotsylinder 28 som strekker seg fra et mellomliggende parti, to the elevation angle cylinder 24, a hydraulic pilot cylinder 28 extending from an intermediate part is articulatedly connected,

av utliggerbommen 11 til den øvre ende av mellomstykket 14. Pilotsylinderen 28 velges like stor som vinkelsylinderen 25 og of the outrigger boom 11 to the upper end of the intermediate piece 14. The pilot cylinder 28 is chosen to be the same size as the angle cylinder 25 and

de geometriske forhold mellom disse leddpunkter og leddakselen 12 gjøres lik tilsvarende arrangement av sylinderens 25 leddpunkter i forhold til leddakselen 13. Den hydrauliske sylinder the geometric relationships between these joint points and the joint shaft 12 are made equal to the corresponding arrangement of the cylinder's 25 joint points in relation to the joint shaft 13. The hydraulic cylinder

25 er over en hydraulisk høydeinnstillingskrets koplet slavisk 25 is above a hydraulic height adjustment circuit connected slave

til pilotsylinderen 28. Høydeinnstillingskretsen består av hydrauliske kanaler som forbinder pilotsylinderens 28 motsatte sylinderrom med de volummessig tilsvarende-sylinderrom i sylinderen 25. Ved forbindelsene til høydevinkelsylinderen 25 er i de nevnte kanaler innsatt hydrauliske låser og tilbake-slagsventiler av konvensjonell type. to the pilot cylinder 28. The height adjustment circuit consists of hydraulic channels which connect the opposite cylinder spaces of the pilot cylinder 28 with the volume-corresponding cylinder spaces in the cylinder 25. At the connections to the elevation angle cylinder 25, hydraulic locks and non-return valves of a conventional type are inserted in the said channels.

Mellomstykket 14 er ved hjelp av en vertikal leddaksel 16 leddet til bomfestet 17. Over en siderettet arm er mellomstykket 14 leddbart koplet til en hydraulisk sidevinkelsylinder 27 som ved et leddpunkt er festet på bomfestet 17. Ved forlengelse eller innkorting av sidevinkelsylinderen 27 skjer en sidesvingning av utliggerbommen 11 og én innstilling av dens sidevinkel til leddakselen 16. Mellomstykket 15 ved utliggerbommens 11 ytre ende er ved hjelp av en vertikal leddaksel 18 leddet til en konsoll 19, som danner styring for den i lengderetningen ved hjelp av en hydraulisk matningsforskyvningssylinder 21 innstillbare matningsbjelke 20. Over den vertikale leddaksel 18 er leddbart koplet en hydraulisk sidevinkelsylinder 26 mellom mellomstykket 15 og konsollen 19. Ved forlengelse eller innkortning av sidevinkelsylinderen 26 kan matningsbjelkens sidevinkel innstilles ved leddakselen 18. Den- hydrauliske sylinder 26 er slavisk koplet til en i størrelse identisk pilotsylinder The intermediate piece 14 is connected to the boom mount 17 by means of a vertical joint shaft 16. Above a side-directed arm, the intermediate piece 14 is articulately connected to a hydraulic side angle cylinder 27 which is attached to the boom mount 17 at a joint point. When extending or shortening the side angle cylinder 27, a lateral swing of the outrigger boom 11 and one setting of its lateral angle to the joint shaft 16. The intermediate piece 15 at the outer end of the outrigger boom 11 is connected by means of a vertical joint shaft 18 to a console 19, which forms a guide for the longitudinally adjustable feed beam 20 by means of a hydraulic feed displacement cylinder 21 Above the vertical joint shaft 18, a hydraulic side angle cylinder 26 is articulated between the intermediate piece 15 and the console 19. By extending or shortening the side angle cylinder 26, the side angle of the feed beam can be set at the joint shaft 18. The hydraulic cylinder 26 is slavishly connected to a pilot cylinder identical in size

29. Denne er leddbart koplet over den vertikale ieddaksel 16 en 0 29. This is hingedly connected over the vertical ieddaxle 16 en 0

mellom bomfestet 17 og/siderettet arm pa mellomstykket 14. between the boom attachment 17 and/side-directed arm on the intermediate piece 14.

på motsatt side av sidevinkelsylinderen 27'.. For en mer detal-jert beskrivelse av borebommen og dens innstilling til forskjellige borestillinger henvises til vårt kanadiske patent 886.975. on the opposite side of the side angle cylinder 27'.. For a more detailed description of the drilling boom and its adjustment to different drilling positions, reference is made to our Canadian patent 886,975.

Fig. 2 viser i snitt monteringen av en viser for avlesning av utliggerbommens 11 sidevinkel relativt bomfestet 17. Mellomstykket 14 er festet til den rørformede leddaksel 16. Fig. 2 shows in section the installation of an indicator for reading the lateral angle of the outrigger boom 11 relative to the boom attachment 17. The intermediate piece 14 is attached to the tubular joint shaft 16.

Ved hjelp av lagerbøssinger 30, 31 er mellomstykket 14 og leddakselen 16 dreibart lagret i bomfestet 17, hvortil en endeplate 32 er festet, hvilken endeplate 32 bærer en skålformet holder By means of bearing bushings 30, 31, the intermediate piece 14 and the joint shaft 16 are rotatably stored in the boom mount 17, to which an end plate 32 is attached, which end plate 32 carries a bowl-shaped holder

33 hvori en induktiv vinkelviser 39 er montert og beskyttet av 33 in which an inductive angle indicator 39 is mounted and protected by

et lokk 35. Ved den rørformede leddaksel 16 er en annen skålformet holder 36 montert. Viserens 39' aksel er via en bøyelig metallbelg 37 forbundet med holderens 36 bunn. Vinkelviseren 39, som i det viste utførelseseksempel utgjøres av en elgon, avgir på kjent måte et signal hvis størrelse og fortegn representerer elgonakselens dreining og dermed utliggerbommens 11 dreining relativt bomfestet. Til leddakselen 18 er på samme måte forbundet en elgon for bestemmelse av konsollens 19 dreining i forhold til utliggerbommen 11. a cover 35. At the tubular joint shaft 16, another cup-shaped holder 36 is mounted. The shaft of the pointer 39' is connected to the bottom of the holder 36 via a flexible metal bellows 37. The angle indicator 39, which in the embodiment shown is constituted by an elgon, emits in a known manner a signal whose magnitude and sign represent the rotation of the elgon shaft and thus the rotation of the outrigger boom 11 relative to the boom attachment. In the same way, an elgon is connected to the joint shaft 18 for determining the rotation of the console 19 in relation to the outrigger boom 11.

Til konsollen 19 er festet en loddvinkelviser A plumb angle indicator is attached to the console 19

38 som kan være av en hvilken som helst for Øyemedet passende type. Som eksempel på loddvisere henvises til amerikansk patent 3.113.283. I det foreliggende utførelseseksempel utgjøres dog loddviseren av en elgon av samme type som sidevinkelviseren hvorved en pendel er montert på elgonens aksel. 38 which can be of any type suitable for Øyemedet. As an example of lot pointers, reference is made to American patent 3,113,283. In the present embodiment, however, the plumb pointer is made up of an electrogon of the same type as the side angle indicator, whereby a pendulum is mounted on the electrogon's shaft.

Indikeringssystemet for sidevinklene og loddvinkelen, se fig. 4, innbefatter elgonene 39, 40 og en elgon The indication system for the side angles and plumb angle, see fig. 4, includes the elgons 39, 40 and one elgon

41 for innstilling av verdien for den ønskede boreretnings 41 for setting the value for the desired drilling direction

sidevinkel i forhold til' en referanseretning. Videre finnes en elektronisk sentral som inneholder en oscillator 42 for frembringelse av passende matningsspenning for elgonviserne,. lateral angle in relation to' a reference direction. Furthermore, there is an electronic central which contains an oscillator 42 for generating a suitable supply voltage for the electric indicators.

ca. 6 V, 700 Hz. Oscillatoren 42 mates med 24 V likestrøm fra akkumulator. En fasedetektor 4 3 er anordnet for fasedetektering av sumsignalene fra elgonene 39, 40, 41. Fasedetektorens 43 referanseinngang mates med oscillatorens 4 2 utgangsspenning. Detektorens 43 signalinngang påføres sumsignalene fra side-vinkelelgonene 39, 40, 41, hvilket signal fås ut på elgonens 40 rotorvikling. Fra detektorens 4 3 utgang f.ås en likestrøm som about. 6 V, 700 Hz. The oscillator 42 is fed with 24 V direct current from the accumulator. A phase detector 4 3 is arranged for phase detection of the sum signals from the electrogons 39, 40, 41. The reference input of the phase detector 43 is fed with the output voltage of the oscillator 4 2 . The signal input of the detector 43 is applied to the sum signals from the side-angle electrogons 39, 40, 41, which signal is obtained on the electrogon 40 rotor winding. From the detector's 4 3 output, a direct current is obtained which

med størrelse og fortegn angir avvikelsen fra sumvinkelen 0°. Vinkelavvikelsen påføres et indikatorinstrument som viser avvikelsen liniært innen f.eks. - 10 . with magnitude and sign indicates the deviation from the sum angle 0°. The angular deviation is applied to an indicator instrument which shows the deviation linearly within e.g. - 10 .

o Ved hjelp av en elgon 47 innstilles børverdien o Using an elgon 47, set the target value

for den ønskede boreretnings loddvinkel. Sumsignalene■fra elgonen 47 og loddvinkelviseren 38 påføres signalinngangen til en fasedetektor 44, fra hvis utgang fås en glattet likestrøm som med størrelse og fortegn angir, avvikelsen fra sumvinkelen 0°. Vinkelavvikelsen påføres, et indikatorinstrument 46 som viser avvikelsen liniært. for the plumb angle of the desired drilling direction. The total signals ■from the electrogon 47 and the plumb angle indicator 38 are applied to the signal input of a phase detector 44, from the output of which a smoothed direct current is obtained which, with magnitude and sign, indicates the deviation from the total angle 0°. The angular deviation is applied, an indicator instrument 46 which shows the deviation linearly.

I en foretrukket tilpasning av oppfinnelsen utgjøres referanseretningen i horisontalplanet av tunnelens eller ortens drivretning. Korrigeringsvinkelen mellom retningen, av. stativet In a preferred adaptation of the invention, the reference direction in the horizontal plane is the driving direction of the tunnel or the locality. The correction angle between the direction, of. the stand

som bærer bomfestet 17 og referanseretningen innstilles ved hjelp av et manøvreringsratt 48 (se fig. 3) som er forbundet which carries the boom mount 17 and the reference direction is set by means of a maneuvering wheel 48 (see fig. 3) which is connected

med elgonen 41 over en kjede (ikke vist). Den ønskede bore-vLnkel i forhold til drivretningen innstilles ved hjelp av et manøvreringsratt 49, som er montert på elgonens 41 aksel. Dreiningsvinkelen av rattet 48 kan avleses på en skala 51. Dreiningsvinkelen av rattet 49 og elgonakselen i forhold til elgonen 41 kan avleses på en skala 50. with the elgon 41 over a chain (not shown). The desired drilling angle in relation to the drive direction is set by means of a steering wheel 49, which is mounted on the shaft of the electrogon 41. The angle of rotation of the steering wheel 48 can be read on a scale 51. The angle of rotation of the steering wheel 49 and the elgon shaft in relation to the elgon 41 can be read on a scale 50.

På fig. 5 vises en annen utførelsesform a<y>In fig. 5 another embodiment a<y> is shown

en borebom ifølge oppfinnelsen.. For enkelhets skyld er tilsvarende deler på utførelsesformene ifølge fig. 1 og 5 gitt samme henvisningsbetegnelser. Ved hjelp av en skjematisk betegnet dreieanordning 52 er bomfestet 17 dreibart 360° om en geometrisk a drilling boom according to the invention.. For the sake of simplicity, corresponding parts on the embodiments according to fig. 1 and 5 given the same reference designations. By means of a schematically designated turning device 52, the boom attachment 17 can be turned 360° about a geometric

polakse 53 som går gjennom senterlinjen for en dreieanordning 52 som inngår i akselen 54. En nærmere beskrivelse av borebommen gjenfinnes i svensk patentsøknad 7309394-0. pole axis 53 which passes through the center line of a turning device 52 which is part of the shaft 54. A more detailed description of the drilling boom can be found in Swedish patent application 7309394-0.

Med leddakslene 16, 18 er forbundet vinkelvisere 39, 40. En loddvinkelviser 38 er forbundet med akselen 34 og angir dennes dreining om polaksen 53. Matningsbjelken 20 er sving-bar i et plan som går gjennom polaksen 53. Ved hjelp av vinkel-viserne 39, 40 fås et signal som representerer matningsbjelkens. 20 stilling i dette plan. Loddvinkelviseren 38 angir dette plans dreining om polaksen 53. Børverdiene for matningsbjelkens stilling i dette plan respektiv planets dreiningsvinkel innstilles ved hjelp av elgoner 41 respektivt 47. Erverdiviserne og børverdi-viserne forbindes ifølge fig. 4 og forskjellen mellom tilsvarende erverdier og børverdier indikeres ved hjelp av viserinstru-menter 45, 46. Angle pointers 39, 40 are connected to the joint shafts 16, 18. A plumb angle pointer 38 is connected to the shaft 34 and indicates its rotation about the pole axis 53. The feed beam 20 is pivotable in a plane that passes through the pole axis 53. With the help of the angle pointers 39 , 40 a signal is obtained which represents the feed beam's. 20 positions in this plan. The plumb angle pointer 38 indicates the rotation of this plane about the pole axis 53. The target values for the position of the feed beam in this plane, respectively the plane's rotation angle, are set with the help of electrodes 41 and 47, respectively. The actual value pointers and target value pointers are connected according to fig. 4 and the difference between corresponding actual values and desired values is indicated by means of display instruments 45, 46.

Oppfinnelsen kan også tilpasses ved andre typer, av borebommer, f.eks. bommer som består av innbyrdes leddede elementer. The invention can also be adapted to other types of drill booms, e.g. booms consisting of interconnected elements.

Claims

1. Method for aligning a feed beam (20) provided with a mechanically fed rock drilling machine (22) to a desired drilling direction, in which the feed beam is swung in relation to the same load-bearing boom (11) and the boom is rotated and/or swung relative to a load-bearing boom stand by means of articulated hydraulic cylinders connected over articulated shafts, and by which the desired drilling direction is defined by specifying the angle of rotation of the feed beam about two mutually perpendicular axes (16,. 18.; 53, 18), characterized by the values that should be for the feed beam (20) angle of rotation about each of the perpendicular axes (16, 18; 53, 18) is set by means of indicator means (41, 47), so that the instantaneous angle of rotation of the feed beam (20) about the perpendicular axes (16, 18; 53, 18) is sensed, that error signals are formed by the difference between the instantly sensed turning angles and respective target values, that the error signals are indicated visually, and that the feed beam and/or the boom is swung or turned ma nually until the instantly sensed turning angles agree consistent with the respective fair value. V

2. Method according to patent claim 1, characterized in that the size and sign of the error signals are indicated by means of a pointer instrument with a central zero line.

3. Method according to patent claim 1 or 2, characterized in that the value that should be for the side angle of the desired drilling direction in relation to a reference direction, preferably a tunnel's or location's driving direction, in is set with the help of a first indicator device (.41), that the value that should be for the plumb angle of the desired drilling direction is set with the help of another indicator device (47), that the vertical plane through the feed beam (20)'s instantaneous side angle in relation to the reference direction is read using by an angle-reading device (39, 40), that a first error signal is formed by the difference between the instantaneous side angle read and the side angle's target value, that this first error signal is indicated-visually, that the feed beam's instantaneous angle to the plumb line in the aforementioned vertical plane is sensed by means of a plumb line -sensing device (38), that another error signal is formed by the difference between the instantly sensed plumb angle and the plumb angle's desired value, that this second error signal is indicated visually, and that the feed beam and/or boom is swung or turned manually until said instantly sensed angles agree with respective target value.

4. Method according to patent claim 3, characters! characterized by the stand's direction in relation to the reference direction being set, that the set stand direction being set with the help of a first maneuvering device (48), that the desired drilling direction in relation to the reference direction being set with the help of another maneuvering device (49), that the sum of the the angles set by the first and second maneuvering means are formed, in order to obtain the desired value of the side angle of the drilling direction in relation to the stand, that. the direction of the feed beam in relation to the stand is sensed by angle detection devices (39, 40) connected to each of the joint shafts, that the sum of the angles sensed instantaneously with each of the angle sensing devices is formed to obtain the existing value of the side angle of the drilling direction relative to the stand, and that the feed beam and/or the boom is swung or turned until the aforementioned existing value agrees with the aforementioned desired value.

5, Method according to patent claim 1, in which the feed beam is rotatable about an axis (53) parallel to its swing plane and the desired drilling direction is defined by specifying the angle of rotation of the feed beam and thus also of the swing plane about the parallel axis (53) as well as of the feed beam rotation in the plane of oscillation, characterized in that the desired values for the rotation angles of the feed beam (20) about the par-allel axis (53) and about it with this perpendicular axis (18) are set by means of pointers (41, 47), that the feed beam (20)'s instantaneous rotation angles about the perpendicular axes (53, 18) are sensed, that error signals are generated by the difference between the instantaneously sensed rotation angles and the respective target value, that these error signals are indicated visually, and that the feed beam and/or the bore boom are manually swung or turned until the instantaneously sensed turning angles agree with the respective set value.

6. Barrier for carrying out the method according to et of the preceding patent claims 1 to 5, for aligning a feed beam (20) equipped with a mechanically fed rock drilling machine (22) to the desired drilling direction, which boom is articulated via joint shafts (16, 18) as well as to a boom mount (17) carried by a stand ) as for the feed beam and is provided with hydraulic cylinders connected over the joint shafts, characterized by means (41, 47) for setting the target values for the feed beam rotation angles about two mutually perpendicular axes (16, 18;

53, 18)/organs for sensing the instantaneous angle of rotation of the feed beam (20) about the perpendicular axes (16, 18; 53, 18), that the setting means (41, 47) and the sensing means (39, 40;

38) is arranged to generate error signals from the difference between the instantaneously sensed rotation angles and the respective target value, and means (45, 46) for visual indication of the error signals.

7. Boom according to patent claim 6, in which the joint shafts include both vertical and horizontal shafts, - k a r a k - , . ,r.. the desired value for terized by means (41) for setting the side angle of/the desired drilling direction relative to a reference direction, angle-sensing tool (39, 40) connected to each of the vertical joint shafts (16, 18) and means ( 45) for visual indication of the error signal formed by the difference between the desired value of the side angle and the sum of the angles sensed by means of each of the aforementioned angle sensing devices.

8. Boom according to patent claim 7, characterized in that the setting means (41) for the mentioned desired value of the side angle comprise means (48) for setting the stand's side angle relative to the reference direction and means. (49) for setting the side angle of the desired drilling direction relative to the reference direction.

9. Boom according to patent claim 7 or 8, characterized by means (47.) for setting the desired value for the plumb angle of the desired drilling direction, plumb sensing means (38) for sensing the instantaneous plumb angle of the feed beam, and means (46) for visual indication of the of the difference between said desired value of the plumb angle and said instantaneous sensed plumb angle formed an error signal.

10. Boom according to patent claim 6, in which the feed beam is rotatable about an axis (53) parallel to its pivot plane and the desired drilling direction is defined by specifying <v>the angle of rotation of the feed beam and thus also of the oscillating plane about the parallel axis (53), as well as of the angle of rotation of the feed beam in the oscillating plane, characterized by means (41, 47) for setting the desired values of the rotation angles of the feed beam about the parallel axis (53) and about the with this perpendicular shaft (18), and organs (39, 40; 38) for sensing the feed beam's instantaneous rotation angles about the perpendicular shafts (18, 53).

11. Boom according to one of patent claims 6 to 10, characterized in that the said organ for visual indication consists of a pointer instrument with a middle zero position.

12. Boom according to one of the patent claims 6 to 11, characterized in that the boom is partly assigned means for automatic movement of the feeding beam between mutually essential parallel positions when swinging the boom, in part the above-mentioned means superior organs for manual alignment of the feed beam so that the mentioned target value or values agree with the respective actual value for correcting the geometrical and/or hydraulic errors of the parallel guide means, deflections from a new position exactly parallel to the previous position when swinging the drilling boom.