CH633074A5 - Rock-drilling apparatus - Google Patents

Description

The invention relates to a rock drilling device with a drilling drive that can be displaced on a carriage by means of a drive element. According to the preamble of patent claim 1.

In a known rock drilling machine of this type (DE-OS 2253 842), noise and dust development during operation are considerable, in particular when the drill drive is a hammer drill, that is to say the rotary drilling movement is supplemented by the superimposed impact movement of a hammer mechanism.

The invention is generally based on the object of reducing noise and dust development in such rock drilling devices and of proposing means by which the discharge of liquid and drill material from the borehole can be improved compared to the prior art.

This object is achieved according to the invention in that an insulating body surrounding the drill rod is connected soundproof to the front of the support plate and that at least the front edge of the insulating body is elastic.

On the one hand, this can completely eliminate dust development from the drilling dust emerging from the borehole and, on the other hand, the noise development can be mitigated by the tool working in the borehole. This applies if the boring bar is only driven in a rotating or rotating manner and additionally in a striking manner. The elastic edge of the insulating body is designed to compensate for any unevenness in the face and is intended to form an effective seal between the insulating body and the face against rock dust and noise. The elastic edge can e.g. B. consist of foam rubber.

According to one embodiment of the invention, the connection between the support plate and the insulating body is articulated. The desired seal between the insulating body and the face can also be achieved if there is an angle that deviates from the right angle between the boring bar and the face. This articulated connection can advantageously consist of a bellows. However, the articulated connection can also have a hollow spherical part connected to the support plate and a complementary spherical guide on the insulating body which overlaps the hollow spherical part. The insulation body then automatically adjusts to the optimal working pivot position with respect to the support plate. The ball connection can at the same time be designed as a stop for this pivoting movement of the insulating body.

5 According to a further embodiment of the invention, at least one nozzle for pressure medium is arranged in the region of the entry of the boring bar into the interior of the insulating body. Water, air or a mixture of water and air can be used as the pressure medium. The pressure medium at least approximately prevents drilling dust and flushing liquid, which emerge from the borehole into the interior of the insulating body, from being able to pass between the boring bar and the support plate.

According to another embodiment of the invention, at least one outlet opening is provided in a wall of the insulating body and is connected to a sound-insulating line. Drilling powder and flushing liquid are removed from the inside of the insulating body from this outlet opening. The line can end below the liquid level of a sump or 20 in a soundproofed separator. An outlet opening is expediently provided at the deepest point of the interior of the insulating body.

According to one embodiment of the invention, forward-facing spacer elements cooperating with the elastic edge are provided on the front of the insulating body. Then the otherwise usual, eccentrically arranged support mandrel can be omitted. The spacers can e.g. B. may be formed as arranged in a foam rubber mandrel.

According to a further embodiment of the invention, a sound-absorbing member surrounding the drill rod is connected on the one hand to a rear side of the support plate and on the other hand to the drill drive. This also effectively combats the noise development on the section between the support plate and the drill drive if this noise development should be impermissibly high. The drill drive itself can be silenced.

The sound-absorbing organ can have at least one bellows. The free ends of adjacent bellows can each be connected in a soundproof manner to a guide bushing for the boring bar that can be moved along the carriage.

According to another embodiment of the invention, the sound-absorbing member has at least one pipe section which is connected to the rear of the support plate and a pipe section which is soundproof with the drill drive, a soundproof connection being provided between the free ends of the pipe sections 45. The soundproof connection can have at least one intermediate pipe section, each end pipe section being telescopically connected at its ends to the free end of at least one of the pipe sections and / or to one end of a further one of the intermediate pipe sections. In this case, an outer end of each intermediate tube piece can be fastened to a support which can be displaced on the mount. An outer free end of the tube piece connected to the support plate can also be fastened to a support connected to the mount.

55 According to a further embodiment of the invention, between the drill drive and the support closest to the drill drive, on the one hand, and two successive supports on the other, a spacer, e.g. a slide bar or chain. The spacers ensure that the supports 60 assume the desired relative position to one another even when drilling inclined relative to the horizontal.

According to another embodiment of the invention, the pipe pieces and / or the intermediate pipe pieces are made of synthetic material, e.g. B. made of polypropylene. The pipe sections and / or the intermediate pipe sections can also consist of rubber. They can also be coated on one side on the same side with an elastic layer, one end ring in each case one of the

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Pipe pieces and the intermediate pipe pieces with the elastic layer of the adjacent pipe piece or intermediate pipe piece in soundproof sliding connection. The pipe sections and intermediate pipe sections can e.g. are made of tubular steel and the elastic layer of rubber or plastic. 5

According to one embodiment of the invention, a guide ring is arranged at an inner end of each elastic layer. which is in sliding contact with the adjacent pipe section or intermediate pipe section. This guide ring can, for. B. consist of brass or plastic or be molded onto the elastic layer. It should result in a favorable bearing pairing with the tube piece or intermediate tube piece interacting therewith.

The end rings and the guide rings can be designed as rings limiting the relative extension of the associated pipe pieces and intermediate pipe pieces 15.

According to a further embodiment of the invention, the elastic layer is provided on its side facing away from the associated pipe section or intermediate pipe section with axially spaced circumferential ribs which can be brought into sealing contact with the associated end ring. Between the individual circumferential ribs there are then annular pockets which receive foreign bodies as well as drilling dust and liquid which have got into the interior of the tube pieces or intermediate tube pieces and, after passing through the end rings, throw them outwards.

According to another embodiment of the invention, a radial end of each circumferential rib is arranged at a radial distance from the opposite pipe section or intermediate pipe section. This limits the mutual friction of the pipe sections and intermediate pipe sections to the necessary extent.

According to a further embodiment of the invention, the pipe drive-side tube section is connected in a soundproof manner to a spindle of the drill drive that rotates the drill rod. The pipe section on the drill drive side also rotates with the spindle, thereby allowing the operator a simple visual inspection of whether and how the boring bar rotates during operation. In the event of deviations from the desired boring bar speed, the operator can intervene quickly and thus protect the rock drilling rig. The pipe section and the spindle can be releasably connected to one another via an elastic coupling sleeve. This makes the spindle and the boring bar quickly accessible when needed. The coupling sleeve can be made of rubber.

According to another embodiment of the invention, the pipe section on the drill drive side is connected to a housing of the drill drive. A particularly favorable sound insulation can be achieved here, including the housing.

The insulating body can have a ring which can be rotated about its longitudinal axis and has at least one outlet opening which is connected to a sound-insulating line. The rock drilling rig can thus be attached to the working face regardless of the random position of the outlet opening of the insulating body. Even after this attachment, the rotatable ring of the outlet opening or openings can be rotated relative to the rest of the insulation body in such a way that the outlet opening or outlet openings are directed downwards in an optimal manner for easy and complete emptying of the insulation body.

According to a further embodiment of the invention, the ring has an annular cavity and is rotatably mounted with an open side on a guide tube of the insulating body which has at least one opening connected to the cavity. The guide tube is expediently attached directly or indirectly to the support plate. This results in a particularly rigid construction and good guidance of the ring. According to another embodiment of the invention, the guide tube has a support crown adjacent to the elastic edge at its free end.

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The support crown engages the face and prevents excessive stress on the front elastic edge of the insulating body. The elastic edge can protrude beyond the support crown when at rest. It is then compressed more and more while increasing the sealing effect when the rock drilling machine is applied, until the support crown has finally come into engagement with the face.

According to a further embodiment of the invention, the elastic edge is designed as a sleeve which can be expanded by a pressure medium and is supported on the insulating body in the axial direction. The pressure medium is only introduced into the cuff when the rock drill is attached. The sleeve can then be used to achieve a perfect seal and soundproofing of the insulating body with respect to the face, to which the sleeve seals.

According to one embodiment of the invention, the elastic edge is supported in the axial direction on the rotatable ring. In this way, the ring can be automatically fixed in its chosen favorable rotary position until the rock drilling machine is moved again.

According to one embodiment of the invention, an elastic ring is arranged between the rotatable ring and the support plate. This ring allows the ring to be rotated and also ensures that the ring is sealed off from the insulating body.

If the working stroke of the rock drilling device is undesirably reduced by the sound-absorbing measures provided on the mount, the support plate can be arranged at the front end of an extension piece mounted in front of the front end of the mount. Although this increases the overall length of the rock drill, practically the entire working stroke of the non-silenced rock drill is available. This measure is recommended if existing rock drilling rigs are to be subsequently equipped with sound-absorbing devices.

Several exemplary embodiments of the invention are shown in the drawings. Show it:

Figure 1 is a partially schematic cross section through a first embodiment.

FIG. 2 shows a detail from FIG. 1 on an enlarged scale;

3 shows the sectional view along line III-III in FIG. 1 in an enlarged representation;

4 shows a longitudinal section through the front part of another embodiment;

5 shows a longitudinal section through the front part of a further embodiment;

6 shows a longitudinal section through part of a further embodiment;

7 shows a longitudinal section through part of another embodiment;

8 shows a longitudinal section through part of yet another embodiment;

9 shows a schematic longitudinal section through a further embodiment;

10 above and below the longitudinal axis two different embodiments of insulating bodies in longitudinal section and in the idle state;

11 shows the two embodiments according to FIG. 10 in their operating state applied to the working face, and

Fig. 12 in longitudinal section a soundproofed rock drill with head-side extension piece on the carriage.

In Fig. 1, a rock drill 20 has a carriage 23, on which by means of a drive member, not shown, for. B. a chain, a drill drive 25 is displaceable. At the front end, the mount 23 has a support plate 27 which, via a bushing 29, guides a boring bar 31 equipped with a tool 30 at the front end. The boring bar 31 is connected via a coupling sleeve 33 to a spindle 35 of the boring

25 coupled inserted end 37 coupled.

The carriage 23 has a tubular support 39, to which a guide rail 40 and 41 is welded at the top on both sides. A support mandrel 45 extends forward from the carriage 23 to a face 43. The carriage 23 is e.g. Carried three-dimensionally adjustable via a boom, not shown, by a chassis, also not shown.

In the area between the face 43 and the support plate 27, the boring bar 31 is surrounded by an insulating body 47. The insulating body 47 is essentially frustoconical and is fastened on the one hand to the support plate 27 and on the other hand is provided with a front ring flange 49. The insulating body 47 consists of sheet steel. A front edge 50 of the insulating body 47 consists of a ring 51 made of foam rubber, which conforms to local unevenness of the face 43 and thereby ensures a dust and soundproof connection between the face 43 and the insulating body 47.

An annular nozzle 53 with a number of nozzle openings distributed over the circumference is fastened to the bushing 29 in an interior space 55 of the insulating body 47. Through a tube 57, the nozzle 53 from outside the insulating body 47 is a pressure medium, for. B. pressurized water, which exits through the nozzle openings in the direction of the dashed arrows and thus prevents drilling dust and possibly rinsing liquid from a borehole 59 into the interior 55 from passing through the bushing 29 onto the back of the support plate 27.

In the lower region, the insulating body 47 has an outlet opening 60 which is connected to a sound-insulating line 61, which ends under a liquid level 63 of a sump 65. Drill 66 settles on the bottom of the sump 65.

A sound-absorbing member 70 surrounding the boring bar 31 is connected in a soundproof manner to a rear side of the support plate 27 and also to the drill drive 25. The organ 70 has a pipe section 73 which is connected soundproof to the rear side of the support plate 27 and a pipe section 75 which is connected soundproof to the drilling drive 25, between which telescopic intermediate pipe sections 76 and 77 are each arranged in a soundproof manner. A free end of the pipe section 73 is fastened to a support 79 connected to the mount 23. The outer free ends of the intermediate tube pieces 76 and 77 are each fastened to a support 80 and 81 which is displaceable on the mount 23. Spacers 83, 84 and 85 in the form of slide rods are displaceably guided on the drill drive 25 or on the supports 79, 80 and 81 and ensure a targeted sliding entrainment or positioning of the supports 80 and 81 during the operation of the rock drilling machine 20 Pipe pieces 73 and 75 and the intermediate pipe pieces 76 and 77 are made of flame-retardant polypropylene suitable for underground use.

In FIG. 2, an end ring 90 is screwed into the inner end of the intermediate tube piece 77, which carries a metallic guide ring 93 for the boring bar 31 on the inside and a plastic guide ring 95 on the outside, which is in sliding contact with an inner wall of the intermediate tube piece 76. An annular seal 97 bears on an outer end face of the intermediate tube piece 76, which on the other hand is in a sound-absorbing sealing connection with an outer surface of the intermediate tube piece 77. The ring seal 97 is held in place by a split clamp 100 which can be tensioned by means of screws 99.

In Fig. 3 it can be seen how the supports 80 with a carriage 103 overlap the guide rails 40 and 41 of the carriage 23.

In FIG. 4, a hollow spherical part 11O is fastened to a front end of the bushing 29 and guides the insulating body 47 via a complementary spherical guide 113 overlapping the hollow spherical part 110. This creates an articulated connection

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between the insulating body 47 and the support plate 27. The annular nozzle 53 is in this case supplied with pressure medium via a connecting channel 115 in the bushing 29.

FIG. 5 shows a modified embodiment of the insulating body 47 insofar as thorn-like spacer elements 117 directed towards the front are attached to the flange 49. Each spacer element is arranged in an opening 118 in the elastic ring 51. As the upper half of FIG. 5 shows, in the idle state the ring 51 projects forward over a tip of the spacer element 117. If, on the other hand, according to the lower half in FIG. 5, the insulating body 47 is moved against the face 43, the elastic ring 51 is compressed until the spacer elements are supported on the face 43. In this way, a complete crushing of the elastic ring 51 is avoided and a separate support mandrel corresponding to the support mandrel 45 in FIGS. 1 and 4 is unnecessary.

In the embodiment according to FIG. 6, the pipe section 75 has a steel pipe 120 which is coated on the outside with an elastic layer 121, e.g. B. a rubber layer is coated. The steel tube 120 is welded at one end to a transition ring 123, which is connected by screws 125 to a housing 127 of the drill drive 25. At its free end, the steel tube carries a guide ring 130 secured by a locking ring 129, which is in sliding contact with an inner surface of a steel tube 131 of the intermediate tube piece 77. The guide ring 130 bears against an end face of the elastic layer 121 and projects radially beyond this elastic layer 121.

The intermediate tube piece 77 also has an elastic layer 133 on the outside and a closing ring 135 at one end. An end ring 137 is inserted into the closing ring 135 adjacent to an end face of the steel tube 131 and secured by a locking ring 139. The end ring 137 is in soundproof sliding connection with the elastic layer 121 with its radially inner surface. Further pipe sections, not shown in FIG. 6, are constructed in a similar manner to the pipe section 75 and the intermediate pipe section 77.

The embodiment of FIG. 7 is the same as that of FIG. 6. Another intermediate tube piece 140 is arranged between the intermediate tube pieces 76 and 77. The pipe section 73 and the intermediate pipe sections 76 and 140 each have a steel pipe 143, 144 and 145 which, like the steel pipes 120 and 131 in the case of FIG. 7, are coated on the outside with an elastic layer 150 to 154. The elastic layers 151 to 154 are provided on the outside with circumferential ribs 157 which are arranged at an axial distance from one another and have a radial distance from the inner wall of the opposite steel tube 143, 144, 145 and 131. However, these circumferential ribs 157 come into sealing contact with the associated end ring 137 via a funnel-shaped curvature 159. The end rings 137 are each secured by an end ring 160, which is fastened to the end ring 135 with screws 161.

In Fig. 8, the pipe section 75 is not coupled to the housing 127 of the drilling drive 25, but with its spindle 35. This is done via an elastic, e.g. Coupling sleeve 165 made of rubber, which is tightened by means of a tensioning strap 167 and a screw 168 on the steel tube 120 and by means of a tensioning strap 169 and a screw 160 on the spindle 35. When the spindle 35 is rotated by the drill drive 25, the pipe section 75 is rotatably carried along.

9, the articulated connection between the insulating body 47 attached to the oblique face 43 and the support plate 27 consists of a bellows 180. The sound-absorbing member 70 is also equipped in FIG. 9 with bellows 183 and 184, the opposite ends of which are also soundproof a guide bushing 187 for the boring bar 31, which can be moved along the carriage 23, are connected. The other end of the bellows 183 is soundproof connected to the back of the support plate 27 and the other end of the bellows 184 to the housing 127 of the drilling

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drive 25. A spacer 190 in the form of a slide rod between the guide bushing 187 and the drilling drive 25 ensures correct positioning of the guide bushing 187 and prevents overstressing of the bellows 183 and 184.

In FIG. 10, one half of a rock drilling device 201 is shown above the longitudinal axis, which is not described in any more detail, and which has a mount 203, a support plate 204 fastened at the front to the mount 203 with a bush 205 held therein for a drill rod 208 carrying a tool 207 at the front. The boring bar 208 is provided with an axial bore 209, through which rinsing liquid reaches the tool 207 in the direction of the arrow.

On the back of the support plate 204, a pipe socket 211 is flanged onto which a piece of pipe made of sound-absorbing material, in this case made of rubber, is pushed tightly. The pipe section 212 and other similar pipe sections, not shown, which are telescopically guided into one another, surround the entire boring bar 208 and provide effective sound insulation.

At the front of the support plate 204 is a spray plate

214 screwed on. The spray plate 214 is through a line

215 a print medium, e.g. B. pressurized water, which passes through a connecting channel 216 into an annular channel 217 of a nozzle insert 218 of the spray plate 214. From the annular channel 217, the pressure medium passes through nozzle openings 220 in a ring-shaped manner in the area in which the drill rod 208 passes through the nozzle insert 218 into a guide tube 211 of an insulating body 223 fastened to the front of the spray plate 214. The pressure medium emerging from the nozzle openings 220 prevents drilling dust and possibly rinsing liquid from a borehole 225 (FIG. 11) from entering the interior of the guide tube 221 through the nozzle insert 218 and the bush 205 through to the rear of the support plate 204.

The front of the guide tube 221 has a support crown 226, with which it establishes positive contact with a face 227 concentrically with the drill tube 208. Approximately in its longitudinal center, the guide tube 221 has openings 229 which connect its interior to an annular cavity 230 of a ring 231. The ring 231 is rotatably supported with an open side on the guide tube 221 and has an outlet opening 233 which is connected via a connecting piece 234 to a sound-insulating line 235 which ends under a liquid level of a sump (not shown). The ring 231 is covered on the outside with a sound-absorbing layer 236.

An elastic ring 238 is inserted between the rotatable ring 231 and the flushing plate 214, which serves both as soundproofing and as a seal for flushing liquid and pressure medium emerging from the nozzle openings 220.

The insulating body 223 has a front elastic edge 240. 10 and 11, above the center line as the first embodiment of this elastic edge 240, a tubular sleeve 241 is placed on the one hand on the guide tube 221 and on the other hand in the axial direction on a side wall of the rotatable ring 231. The interior of the sleeve 241 is connected to a line 242 through which pressure medium can be introduced into the sleeve 241. This happens when the support crown according to FIG. 11 bears against the face 227. The cuff 241 is then able to seal even larger bumps in the face 227 so that there is a perfect seal against sound and liquid between the face 227 and the insulating body 223 around the boring bar 208. As soon as the drilling process is complete, the pressure medium is released from the sleeve 241 through the line 242. As a result, the cuff 241 shrinks back to the size shown in FIG. 10.

Another embodiment of the elastic edge 240 in the form of a rubber ring 244 protruding beyond the front end of the support crown 226 in the rest state according to FIG. 10 is shown below the center line in FIGS. 10 and 11. The rubber ring 244 is held on the guide tube 221 by a bandage 245. When the rock drill 201 is moved into contact with the face 227, the rubber ring 244 first lies against the face 227 and is compressed more and more until the support crown 226 finally comes into contact with the face 227 until it assumes the shape shown in FIG. 11 . In this position, a good seal against sound and liquid is achieved between the guide tube 226 and the rotatable ring 231.

In Fig. 12, the same parts as in Figs. 10 and 11 are given the same reference numerals. In this case, an extension piece 247, which carries the support plate 204 at its front end, is provided with screws 246 at the front end of the mount 203. The axial length of the extension piece 247 corresponds approximately to the length of the pipe section 212. Further pipe sections 249, 250 and 251 telescopically adjoin the pipe section 212 towards the rear and encapsulate the boring bar 208 up to a drill drive 255 which can be displaced on the carriage 203 and is soundproof. The pipe sections 212, 249, 250 and 251 are supported on the carriage 203 in part in a longitudinally displaceable manner by supports 256, 257 and 258.

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Claims (36)

633 074 PATENT CLAIMS 1. Rock drilling device with a on a carriage (23) by means of a drive member displaceable drilling drive (25) for a boring bar (31) which is guided by a support plate (27) connected to the front end of the carriage, characterized in that with the front an insulating body (47) surrounding the boring bar (31) is connected to the support plate (27) in a soundproof manner, and that at least the front edge (50) of the insulating body (47) is elastic. 2nd 2. Rock drill according to claim 1, characterized in that the connection between the support plate (27) and the insulating body (47) is articulated. 3. Rock drill according to claim 2, characterized. that the articulated connection consists of a bellows (180). 4. Rock drilling apparatus according to claim 2, characterized in that the articulated connection has a hollow spherical part (110) connected to the support plate (27) and a complementary spherical guide (113) overlapping the hollow spherical part (110) on the insulating body (47). 5 5. Rock drilling device according to one of claims 1 to 4, characterized in that at least one nozzle (53) for a pressure medium is arranged in the region of the entry of the boring bar (31) into the interior of the insulating body (47). 6. Rock drilling device according to one of claims 1 to 4, characterized in that in the wall of the insulating body (47) at least one outlet opening (60) is provided for the drill material, which is connected to a sound-absorbing line (61). 7. Rock drilling apparatus according to claim 6, characterized in that the outlet opening (60) is provided at the deepest point of the interior (55) of the insulating body (47). 8. Rock drilling apparatus according to one of claims 1 to 7, characterized in that spacer elements (117) are provided at the front of the insulating body (47) and are directed towards the front and cooperate with the elastic edge (50). 9. Rock drilling device according to one of claims 1 to 8, characterized in that on the one hand with the back of the support plate (27) and on the other hand with the drill drive (25) a sound-absorbing member (70) surrounding the boring bar (31) is connected soundproof. 10th 10. Rock drilling apparatus according to claim 9, characterized in that the sound-absorbing member (70) has at least one bellows (183; 184). 11. Rock drilling apparatus according to claim 10 with a plurality of bellows, characterized in that the free ends of adjacent bellows (183, 184) are each soundproof connected to a guide bushing (187) for the drill rod (31) which can be moved along the carriage (23). 12. Rock drilling apparatus according to claim 9, characterized in that the sound-absorbing member (70) has a pipe section (73; 75) connected to the rear of the support plate (27) and to the drill drive (25) in a soundproof manner, and that between the free ends the pipe sections (73; 75) are provided with a soundproof connection (76, 77). 13. Rock drilling apparatus according to claim 12, characterized in that the soundproof connection has at least one intermediate pipe section (76; 77; 140), each intermediate pipe section either with the free end of one of the pipe sections or an intermediate pipe section and on the other hand with the free end of the other pipe section or an intermediate pipe section is connected telescopically. 14. Rock drilling apparatus according to claim 13, characterized in that the outer end of each intermediate tube piece (76; 77) is attached to a support (80; 81) displaceable on the carriage (23). 15 15. Rock drill according to claim 13 or 14, characterized in that the outer free end of the Support plate (27) connected pipe section (73) is attached to a support (79) connected to the carriage (23). 16. Rock drill according to claim 14 or 15, characterized in that between the drill drive (25) and the drill drive (25) closest support (81) on the one hand and between two successive supports (80; 81; 79.80) on the other hand, a spacer (85; 84; 83), e.g. B. a slide rod or a chain is arranged. 17. Rock drill according to one of claims 13 to 16, characterized in that the pipe pieces (73; 75) and / or the intermediate pipe pieces (76; 77) made of plastic, for. B. polypropylene. 18. Rock drill according to one of claims 13 to 16, characterized in that the pipe pieces and / or the intermediate pipe pieces consist of rubber. 19. Rock drill according to one of claims 13 to 16, characterized in that the pipe pieces (73; 75) and / or the intermediate pipe pieces (76; 77; 140) on one side on the same side with an elastic layer (121; 133; 150 to 154 ) are coated, and that in each case one end ring (137) of one (73) of the pipe sections (73; 75) and the intermediate pipe sections (75; 77; 140) is in sound-proof sliding connection with the elastic layer of the adjacent pipe section or intermediate pipe section. 20th 20. Rock drill according to claim 19, characterized in that a guide ring (130) is arranged at the inner end of each elastic layer (121; 151 to 154), which is in sliding contact with the adjacent pipe section or intermediate pipe section. 21. Rock drilling apparatus according to claim 20, characterized in that the end rings (137) and the guide rings (130) are designed as rings limiting the relative extension of the associated pipe pieces and intermediate pipe pieces. 22. Rock drill according to one of claims 19 to 21, characterized in that the elastic layers (151 to 154) are provided on their outer sides with axially spaced circumferential ribs (157) which are in sealing contact with the end ring (137) of the pipe section or intermediate pipe section connected below can be brought. 23. Rock drilling apparatus according to claim 22, characterized in that the radial end of each circumferential rib (157) is arranged at a radial distance from the opposite pipe section (73) or intermediate pipe section (76; 77; 140). 24. Rock drilling apparatus according to one of claims 12 to 23, characterized in that the pipe drive piece (75) on the drill drive side is connected in a soundproof manner to a spindle (35) of the drill drive (25) which rotates the drill rod (31). 25th 25. Rock drilling apparatus according to claim 24, characterized in that the pipe section (75) and spindle (35) are detachably connected to one another via an elastic coupling sleeve (165). 26. Rock drilling apparatus according to one of claims 12 to 23, characterized in that the pipe drive piece (75) on the drill drive side is connected to a housing (127) of the drill drive (25). 27. Rock drilling apparatus according to claim 1, characterized in that the insulating body (223) has a ring (231) which can be rotated about its longitudinal axis and has at least one outlet opening (233) which is connected to a sound-insulating line (235). 28. Rock drilling apparatus according to claim 27, characterized in that the ring (231) has an annular cavity (230) and is rotatably mounted with an open side of this cavity on a guide tube (221) of the insulating body (223), which has at least one with the Has cavity (230) communicating opening (229). 29. Rock drill according to claim 28, characterized in that the guide tube (221) with the support plate (214, 204) is fixedly connected. 30. Rock drilling apparatus according to claim 28 or 29, characterized in that the guide tube (221) has at its free end a support crown • (226) adjacent to the elastic edge (240). 30th 31. Rock drilling apparatus according to claim 30, characterized in that the elastic edge (240) projects beyond the supporting crown (226) in the idle state. 32. Rock drilling apparatus according to claim 31, characterized in that the elastic edge (240) is designed as a tubular sleeve (241) which can be expanded by a pressure medium and is supported in the axial direction on the insulating body (223). 33. Rock drill according to one of claims 27 to 32, characterized in that the elastic edge (240) is supported in the axial direction on the rotatable ring (231). 34. Rock drilling machine according to one of claims 27 to 33, characterized in that an elastic ring (238) is arranged between the rotatable ring (231) and the support plate (214, 204). 35. Rock drill according to one of claims 27 to 34, characterized in that the support plate (204) is arranged at the front end of an extension piece (247) mounted in front of the front end of the mount (203). 35 40 45 50 55 60 65 633 074 36. Rock drill according to claim 1, characterized in that an extension piece (247) is arranged between the support plate (204) and the front end of the mount (203).