JPS58218584A - Large diameter rock drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large-diameter hole-drilling device that can easily drill relatively large-diameter holes.

In order to erect utility poles, steel towers, etc. on the ground, it is necessary to drill large diameter holes, and such large diameter holes are generally formed using an auger.

However, holes made with a normal auger are made in the soil.

Although possible in soft rock and clay areas, drilling is difficult in hard rock areas. Therefore, rock augers and down-the-hole drills are used to drill large diameter holes in hard rock areas. For rock augers and down-the-hole drills, if the hole diameter is close to 50 cm, the total length is usually several meters, and since they are excavated under their own weight, the total weight is 1.
It is normal for it to reach 0 tons or more. If the device is long and heavy, a large specialized cart is required, making the overall manufacturing cost very high.Moreover, it is difficult to transport, so it is difficult to drill many relatively shallow large-diameter holes. There is a problem of low efficiency. Furthermore, although rock augers are capable of drilling holes in hard rock areas and concrete paved roads, they are time consuming and often cannot be used due to construction schedules. On the other hand, percussion rock drills such as leg drills and crawler drills have a feed mechanism and use small diameter pits, so they have good drilling efficiency, and even in hard rock areas, they can drill holes with a diameter of 30 to 59 mm. If so, drilling is easy. However, if the hole is a large-diameter hole with a diameter of nearly 20 cm, the impact force is generally insufficient and drilling is difficult, and furthermore, considering the diameter of the relay iron, it is likely to be difficult to install a large-diameter pit.

Therefore, in such cases, the current practice is to first form a large number of circular holes with small diameters, and then dig them out by hand using a hand-held breaker, sinker, or the like. If the work is done by hand, the large-diameter holes formed tend to be uneven, and additional digging is required, which takes several days to form one drilled hole, which is extremely inefficient. Although there are large rotary impact rock drills that can drill a hole with a diameter of around 19 cm in one turn, this type of rock drill requires a special cart and is expensive, and it cannot be used for long holes with a depth of 10 m or more. Even if it is possible to drill a hole of approximately 20 cm in diameter, the reality is that there are almost no rock drills that can be drilled when the hole diameter approaches 20 cm.

The present invention is intended to ameliorate the aforementioned problems encountered with the various previously existing drilling means with respect to the formation of relatively large diameter holes in hard rock areas. Therefore, an object of the present invention is to provide a large-diameter hole drilling rock that can relatively easily drill large-diameter holes by generating a striking force according to the rock quality and hole diameter by installing a striking mechanism and a rotating mechanism independently. It is to provide. Another object of the present invention is to
To provide a large-diameter hole drilling rock that can be mounted on an appropriate self-propelled truck and stably hold a large-diameter pit with a large weight. Yet another object of the present invention is to provide a large-diameter drilling rock that quickly removes a large amount of cuttings generated during drilling.

Next, an embodiment of the present invention will be described based on the drawings. Figs. 1 and 2 show a rock-cutting rock 1 according to the present invention.

The rock drill 1 includes a movable plate 4 on which a striking mechanism 2 and a rotating mechanism 3 are installed independently, a lead rod 5 that is rotated by the rotating mechanism 3, and a pit 6 that is connected to the lead rod and can be detachably attached to the tip. It is provided with a hollow rod 7 to which the movable plate 4 is attached and an elongated guide cell 8 to which the movable plate 4 is slidably attached, and the guide cell can be mounted on an appropriate self-propelled truck via a bracket 9 (FIG. 12). The rotation mechanism 3 used in the present invention includes, for example, a hydraulic or pneumatic motor, and in FIG. It is stuck in the center. On the other hand, the striking mechanism 2 used in the present invention utilizes various hydraulic or pneumatic striking devices, or is composed of a dedicated striking device, and is installed behind the rotating mechanism 3 on the movable plate 4, and is driven by the piston 12. The rear end surface of the lead rod 5 is struck directly or indirectly.

A striking device 13 used as an example of the striking mechanism 2 is shown in FIG.
4, and a substantially cylindrical elongated piston 12 is slidably housed in the cylinder. A front cap 15 is located in front of the cylinder 14, and a shank bushing 16 and a front sleeve 17 are fitted and fixed in the center hole of the front cap 15, and side rods (not shown) are erected at the four corners of the cap 15, and the cylinder 14 by tightening the side rod nut 18 through the pack cap 14a above the back cap 14a.

The cylinder 14 and front cap 15 are fixed to each other. A chisel 19 is inserted into the center hole of the front cap 15, a long groove 20 is provided in a part of the peripheral wall of the core chisel in the axial direction, and a pin 21 that passes through the long groove and is fitted in the horizontal direction is fixed to the cap wall. Further, the cylinder 14 has a valve case 22 at the center of its peripheral wall, and a valve spool 23 is slidably housed in the valve case. The valve spool 23 is installed to control the movement of the piston 12,
The hydraulic oil is supplied to and discharged from the piston 12 and the valve spool 23 via nipples 24, 24 mounted at the rear of the cylinder. A high-pressure accumulator 25 is installed above the cylinder 14 to smooth out pulsations in the high-pressure oil that occur when the piston 12 reciprocates. This striking device 1
3 to the drilling rock 1 of the present invention, first install the bottle 21.
It is necessary to remove the chisel 19 by pulling it out, and then loosen the side rod and remove the front cap 15. After that, as shown in FIG. 4, a separate cap 26 is placed in contact with the rear end surface of the housing 11 of the rotation mechanism 3, and the shank bushing 16 is inserted into the center hole of the separate cap 26, followed by the front sleeve 1.
7 are fitted and fixed, then the side rod 27 (M5 diagram) is erected and tightened with a hollow 18 above the cylinder 14.

As a result, the rear portion of the lead rod 5 projects rearward from the bushing 16, and the piston 12 is positioned coaxially with the lead rod 5. Furthermore, a pair of parallel brackets 28 and 28 are fixed on the movable plate 4 at right angles to the movable plate, and a cylinder 14 is arranged between both parallel brackets, and a plurality of bolts 29
The cylinder 14 is held by tightening as shown in FIG. Parallel bracket) 28. 28 is the horizontal bracket (
(not shown), and is fixed to the movable plate 4 by bolting or welding. In the striking mechanism 2 installed in this way, the hydraulic oil is switched by the pulp spool 23.
1 causes the piston 12 to reciprocate in the axial direction within the cylinder 14, and this hydraulic oil is fed and discharged through the nipple 24.
24 and a hose connected to the nuclear nipple (not shown)
For example, a power shovel 30 (see Figure 12)
by communicating with the hydraulic power source and tank.

This striking mechanism 2 is usually constructed by loosening the bolt 29 of the parallel bracket 28 and the side rod nut 18, removing the cylinder 14, and installing a new striking device having the desired striking force and number of strikes as the striking mechanism of the present invention. do it.

In this case, since the piston diameter is usually different, the bushing 1
6. Since the sleeve 17 and cap 26 are often replaced at the same time, and the impact point of the piston also changes, it is desirable to attach a suitable jig for adjustment. Furthermore, if the cylinder outer diameter of the desired impact device is different, the parallel brackets 28 and 28 may be adjusted by loosening bolts or reset to predetermined intervals using spacers (not shown) or the like.

The structure of the lead rod 5 is specifically shown in FIGS. 4 to 6, and is similar to that shown in FIGS. 1 and 2 except that the hydraulic motor 10 is installed on the side of the lead rod 5 in this embodiment.
It is almost the same as the embodiment shown in the figure. In FIG. 4, the lead rod 5 is arranged along the vertical center of the movable plate 4, and an axial protrusion 32 is formed on the peripheral wall behind the center of the rod so as to have, for example, a cross section. Furthermore, the center hole 3 of the reduction gear 34 that fits into this part of the lead rod 5
6 is formed with a predetermined number of engagement grooves 38 corresponding to the protrusions 32, the lead rod 5 is connected to the reduction gear 3 as shown in FIG.
4 and can be spline-connected so as to be movable in the axial direction. The drive gear 40 that meshes with the reduction gear 34 is connected to a key 42.
It is fixed to the rotating shaft 44 of the hydraulic motor 10 by a cover 46, and is protected by a cover 46. Due to the axially movable spline connection between the lead rod 5 and the reduction gear 34, even when the impact force of the piston 12 is transmitted to the lead rod 5, little impact is transmitted to the gears 34, 40. On the other hand, a middle upper hole 48 is provided in the front part of the lead rod 5, and the rear end of the center hole communicates with a diametrically extending horizontal hole 50. The lateral hole 50 is connected to an external compressor (not shown) via a through hole 54 in the perforated bushing 52 and a conduit 56 in the housing wall, i.e. the holes 48t 50t 54 and the conduit 56 form part of the blow passage. do. It is preferable that the upper and lower ends of the bushing 52 are brought into airtight contact with the outer circumferential wall of the lead rod and the inner circumferential wall of the housing at the center of the lead rod 5.

The hollow iron door is coaxially and removably connected to the front end of the lead rod 5, and has a thick-walled cylindrical connecting member 58 having a diameter approximately equal to the outer diameter of the rod 7, and a connecting member 58 above the connecting member. (4th
(see Figure and Figure 6).

At the front end of the lead rod 5, an axial protrusion 6 is formed on the circumferential wall, for example, so as to have an approximately cross-shaped cross section, similar to the rear part of the center part.
2, while a projection 6 is provided above the inner circumferential wall of the connecting member 58.
A predetermined number of axial engagement grooves 64 corresponding to 2 are formed, and the lead rod 5 and the connecting member 58 are spline-coupled, and both are further fixed by a tightening member 60 to prevent the hollow door from falling off. This spline connection is suitable for increasing the contact area between both members and reliably transmitting rotational force, and it is of course possible to use other connection means as desired. To install the tightening member 60, an annular groove 66 is formed in the upper outer circumferential wall of the connecting member 58, and horizontal through holes 68, 68 are formed parallel to the diameter direction and off-center on the same horizontal plane as the annular groove. Each horizontal through hole is formed by cutting out a part of the protrusion 62 of the lead rod 5. As a result, a pair of comb-like semicircular portions 70.70 that fit into the annular groove 66 and the horizontal through-holes 68.68 are made to face each other.
It is sufficient to tighten it strongly with 72. Inner cylinder part 74 of hollow rod 7
is inserted airtightly under the inner circumferential wall of the connecting member 58, and the outer cylindrical portion 76 is screwed airtightly to the lower side of the outer peripheral wall of the connecting member 58, so that both the cylindrical portions 74 and 76 are arranged concentrically. The center hole 77 of the connecting member 58 connects to the inner cylindrical portion 74 at the center.
The diameter is smaller than the inner diameter of the A predetermined number of through holes 78 are provided near the middle of the rear end of the outer cylindrical portion 76, and a predetermined number of through holes 78 are provided in the vicinity of the rear end of the outer cylindrical portion 76. ), that is, the holes 78, 81 and the pipe 83 form part of the dust removal passage. The upper and lower ends of the bushing 80 are brought into airtight contact with the outer peripheral wall of the outer cylinder part at the rear end part of the outer cylinder part 74, and the bushing is fixed to the support member 82 with a pin 84. Since it is fixed to the upper front, the hollow rod 7 is stably supported when the movable plate 40 moves back and forth.

The relay method and bit attachment method for making the hollow rod 7 a predetermined length will become clear from FIGS. 7 to 11. To connect the hollow rods, as shown in FIG. 7, a thick cylindrical relay member 86 having a diameter approximately equal to the outside diameter of the rod is used, and the inner cylindrical portion 74a of one hollow rod is connected to the inner circumferential wall of the relay member 86. The outer cylinder part 76 is inserted airtightly into the upper part.
a is airtightly screwed to the upper part of the outer peripheral wall of the relay member 86, and the inner cylindrical part 74b of the other hollow rod is screwed to the upper part of the outer circumferential wall of the relay member 86.
6, and the outer (12) cylindrical portion 76b is hermetically screwed to the lower side of the outer peripheral wall of the relay member 86. The center hole 88 of the relay member 86 preferably has a smaller diameter than the inner diameter of the inner cylinder portion 74 at its center. The center hole 88 constitutes a part of the blow passage, and vertical through holes 90 (FIG. 8) are provided at predetermined intervals in the circumferential direction on the end face of the relay member, and each vertical through hole is connected to the inner cylindrical portion 74. By being located between the outer periphery of the outer cylindrical part 76 and the inner periphery of the outer cylinder part 76, it constitutes a part of the dust removal passage. A desired number of relay members 86 may be used depending on the depth of the large-diameter hole to be drilled and the length of the hollow rod 7, and may not be used if the depth is shallow. At the front end of the hollow rod 7, as shown in FIG. 9, a thick cylindrical mounting member 92 having a diameter approximately equal to the outer diameter of the rod is used. The outer cylindrical portion is hermetically screwed onto the upper outer peripheral wall of the mounting member 92 to maintain the concentric arrangement of both cylindrical portions 74 and 76.

In the upper end direction of the mounting member 92, vertical holes 94 (FIG. 10) are provided at predetermined intervals in the circumferential direction, and the upper end portion 94 of each vertical hole
a is located between the outer periphery of the inner cylindrical portion 74 and the inner periphery of the outer cylindrical portion 76, and the lower end portion 941) of each vertical hole is located between the mounting member 92
The dust removal passage extends diametrically outward to the outer peripheral surface of the dust removal passage. It is preferable that the dust removal hood 96, which has a circular shape, for example, be bolted to the outer cylindrical portion 76 of the hollow rod 7 in close proximity to the bit 6 behind the lower end portion 94b of each vertical hole. The shape of the dust removal hood 96 may be a conical shape as shown in FIG. 1 or a crown shape as shown in FIG.
Alternatively, the hood may have a bowl-like shape, but the outer diameter of the hood is set to be approximately equal to the diameter of the bit 6, and the annular member 98 constituting the outermost diameter portion is an elastic member such as rubber. I like it. The annular member 98 is bolted to the lower peripheral surface of the dust removal hood 96. As a result, as the hollow rod 7 moves forward, the bit 6 forms a drilling hole, and the dust removal hood 96 also subsequently enters into the drilling hole, and at this time, the dust removal hood 96 brings the annular member 98 into contact with the hole wall. Therefore, the turning powder formed by the bit 6 can be effectively removed. The dust removal hood 96 and the annular member 98 can be replaced depending on the diameter of the bit 6. on the other hand,
The center hole 100 of the mounting member 92 has a diameter smaller than the inner diameter of the inner time portion 74 at the center thereof, and an engagement groove 102 at the lower portion so as to have a substantially cross-shaped cross section.
(Figures 10 and 11). The rear part 104 of the bit 6 has an axial protrusion 106 that corresponds to the retaining groove 102 so that it can be extended vertically below the center hole of the mounting member 92, thereby connecting the mounting member 92 and the bit 6 to a spline. Join. Further, in the lower outer peripheral wall of the mounting member 92, a pair of horizontal holes 108, 108 are provided parallel to the diametrical direction and offset from the center.
Each horizontal hole is formed by cutting out a part of the protrusion 106 of the rear part 104 of the bit. A rod-shaped cock pin 110° 110 having a rectangular cross section, for example, corresponding to the horizontal hole 108 is fitted into the horizontal hole 108, and then fixed by driving a spring pin 111 into the convex wall portion between both the horizontal holes 108. In addition to this mounting method, as shown in FIG. 2, a bottomed hole corresponding to the diameter of the mounting member 92 is provided at the rear of the bit 6, and the lower part of the mounting member 921 is inserted into the bottomed hole. Then, both may be identified using a plurality of kottapins (15). The rear part 104 of the bit has a center hole 11.
2, and the center hole communicates with the center hole 100 of the mounting member 92 to form a blow passage.

The large-diameter bit 6 attached to the front end of the hollow rod 7 is, for example, a parent-child bit as shown in FIG. It reaches the surface and blows out compressed air from there (see Figure 2). Although not shown, a finishing bit may be used depending on the size of the hole to be drilled or the rock quality of the location to be drilled. Preferably, it is expanded in the diametrical direction and has, for example, a plurality of button bit pieces embedded radially on the expanded periphery.

The guide cell 8 used in the present invention is constructed by arranging two long channel steel members 115 and 115 facing each other in parallel with their openings facing outward, as shown in FIG. 14, for example. The connection rods 116 are identified at predetermined intervals. As is clear from FIGS. 2 and 13 (16), at the rear and front ends of the guide cell 8,
A sprocket 11 is installed between the channel cables 115 and 115, respectively.
8 and 120 are rotatably supported, a chain 122 is stretched between both sprockets, and the front and rear ends of the chain are fixed to the bottom surface of the movable plate 4. Furthermore, the movable plate 4 holds the support piece 125 that sandwiches the upper side edge 124 of the guide cell 8 on the lower side by a large number of poles 123 (FIG. 1) arranged along both side edges. The movable plate 4 is slidable along the guide cell 8, and when the sprocket 118 is rotated, the movable plate 4 is moved through the chain 122.
The sprocket 118 is rotated by a hydraulic foot motor 126 installed at the rear end of the guide cell. Further, a foot pad 127 is fixedly attached to the lower front end of the guide cell 8 to support the entire rock drill during drilling work (see Fig. 12).The foot pad is spaced further from the hollow rod 7 than the guide cell 8, but 8 and extends further forward. Foot pad 12714
, for example made of a single piece of steel with an engineering cross-section, the circular shape of which tapers at the front. Further, above the front end of the guide cell 8, a centralizer 128 is installed to hold the hollow rod 7 when not drilling, and the centralizer consists of a semicircular annular member 130, 130 whose inner diameter is approximately equal to the rod diameter. Both annular members 130,1
30 is a bolt 132 (
(Fig. 1) and can be opened outward by removing the bolt 132 during drilling work. For this purpose, both annular members 1.30, 130 are pivotally connected to a mounting bracket (not shown) fixed on the guide cell 8, and a suitable bushing 134 is provided on the inner surface of the annular member to protect the outer peripheral surface of the rod.
It is preferable to affix (Fig. 2) and P.

FIGS. 12 to 14 show an example of a bracket 9 for mounting the rock drill l on a suitable self-propelled truck, and the bracket is positioned, for example, approximately in the center of the guide cell 8 as desired. When the bracket 9 is viewed from the front, as shown in FIG. 13, there is, for example, a horizontally long rectangular bracket main body 136, and in FIG. 14, a mounting plate 138 is arranged on the left side thereof. The mounting plate 138 has a rectangular shape, has an upper surface abutting the lower side edges 140 of the guide cell 8 along the longitudinal direction, and has pressing pieces 14 on both lower side edges.
2, 142, and then the guide cell 8 is fixed to the mounting plate 138 by tightening with a large number of bolts 144. A circular projection 146 is formed at the center of the lower surface of the mounting plate 138, and this projection projects to the back surface through a through hole 148 of the bracket body, so a nut 150 is tightened to this projection to enable the mounting plate 138 to rotate. Hold. Hydraulic cylinder 1
52 is arranged on the right side of the bracket main body 136 in parallel with the upper surface thereof, the rear end of the tube 154 is pivotally connected above the right end of the bracket main body 136, and the front end of the piston rod 156 is attached to the mounting plate 138. By being pivotally mounted below the right end, it is arranged diagonally with respect to the mounting plate. As a result, if the piston rod 156 of the hydraulic cylinder 152 is extended, the mounting plate 138, that is, the guide cell 8, can be rotated clockwise (19) in FIG. When the contraction operation is performed, the guide cell 8 can be rotated counterclockwise.

The possibility of such a pivoting movement is advantageous when drilling obliquely to the surface to be drilled. Hydraulic cylinder 15
2 may be covered with a suitable cover (not shown) to prevent dust from entering. Still on the bracket body 136,
On the right side, a pair of juxtaposed plates 158, 1 perpendicular to the lower surface
58, the juxtaposition plates having a substantially triangular side profile (see FIG. 12), and each having a pair of bottle holes 160.
, 160 are provided at predetermined intervals. Juxtaposed plates 158, 15
Between the holes 160 and 160, the tip of an appropriate self-propelled truck's arm swing or boom and a packet link or piston rod may be arranged, and the pins may be passed through the holes 160, 160 for pivoting. With respect to the arm or boom of the self-propelled truck, the guide cell 8 can be placed on the left side as shown in FIG. 13, or the bracket 9 can be attached in the opposite direction to that shown and the guide cell 8 can be placed on the right side. It is possible, and the arrangement may be determined so that the driver of the self-propelled trolley can easily operate it.

(20) FIGS. 15 and 16 show modified examples of the present invention, and the striking device 13 as illustrated in FIG. 3 can be used as it is as the striking mechanism 163 of the rock drill 162. In other words, in the striking device 13, when the pin 21 is attached or removed and the chisel 19 is replaced with a shorter cylindrical chisel 164, the striking device can be replaced with a parallel bracket on the movable plate 165).
It is sufficient to install the device between 1661166 and 1661166. At this time, the parallel bracket 166 is bolted or welded to the movable plate 165, and after mounting, the cylindrical chisel 164 is close to the rear end surface of the lead rod 167 (see the two-dot chain line in FIG. 16). On the other hand, a hydraulic motor 168, which is a rotation mechanism, is fixed on a movable plate 165 via a housing 169 that houses a lead rod 167, and a drive gear 170 fixed to the rotation shaft of the hydraulic motor is connected to a large diameter Reduction gear 171
meshing, and reduction gear 171 and lead rod 1
67 are spline-connected so as to be movable in the axial direction. The hollow rod 172 is not a double cylinder, but simply a fairly thick and elongated cylindrical body having a blow passage.Bottomed holes 173 and 174 are respectively formed in the front and rear end surfaces of the hollow rod, and one bottomed hole ] Insert the front part of the dororad 167 into the hole 73 and secure it with the cotter pin 175, and then open the other bottomed hole 1
Insert the rear part of the bit 176 into 74 and attach the cotter pin 1.
It stops at 77.

foot collar fixed to the front end of the guide cell 178) 1
79 consists of a pair of parallel bars, each of which has a conical tip. The rock drill 162 in this embodiment usually does not have a built-in dust removal mechanism, but may be equipped with a dust removal hood 180 as shown in FIG. 17 as desired. Dust removal hood 1
80 is an elongated cylindrical body that roughly corresponds to the hollow rod 172, and its inner diameter is larger than the diameter of the hollow rod 172, but its outer diameter is smaller than the diameter of the bit 176.

An annular member 181 is fixed to the inside of the rear end of the dust removal hood 180, and a brush 18 is arranged outwardly and annularly on the outside of the front end of the hood.
2 should be buried. The annular member 181 is connected to the hollow rod 17
2, the dust removal hood 180 has a downward opening, and the spacer 183 allows the dust removal hood 180 to open downwardly.
be placed coaxially with the

If the through hole 184 provided at the rear end of the dust removal hood 180 is connected to the hose of a dust collector (not shown), the bit 176
The chestnut powder generated can be sucked into the dust collector through the dust removal hood 180. At this time, the front end of the dust removal hood 180 is located slightly behind the pit 176 and comes into contact with the inner circumferential wall of the perforated hole 185 together with the bit to reduce the pressure in the space behind the bit.

Since the hammering device 162 can be attached to a known hitting device without disassembling it, it is preferable to classify it as an attachment for a hitting device. That is, the striking device 13
In normal cases, it is mounted as a breaker on a power shovel or the like, and only when drilling is required, it is attached to the drilling Iwatsuki 162 as a striking mechanism 163, and once the drilling work is completed, it can easily be used as a breaker again. be.

The self-propelled truck on which the rock-cutting rock 1 according to the present invention is mounted is the 12th
In addition to the power shovel 30 shown in the figure, use a backhoe or crane trolley! - Furthermore, the traveling body may be a roller as shown in the figure, or a wheel type or track type running body (23) may be used to further improve transportability. As shown in the figure, in the case of a power shovel 30, the larger the impact force or rotational force of the rock drill 1, the greater the impact, so in order to prevent the arm from deforming or breaking, the arm is removed and the boom is directly mounted. Although it is attached to the 186, if it is a large power shovel, it can also be pivoted to the arm and packet link. In the striking mechanism 2 in the Iwatsuki I, the piston 12 is operated by the function shown in FIG. 18, for example. In Fig. 18, the piston 12
is in a state where it has advanced almost to the bottom dead center, and the pressure receiving surface 190 of the piston large diameter portion 188 moves into the intermediate oil chamber 192, so that the high pressure conduit 194 is moved into the upper oil chamber 196. Intermediate oil chamber 19
2 and the first switching conduit 195 to the valve spool 23
It communicates with the lower oil chamber 197 of. Since the upward pressure receiving surface 198 of the valve spool disposed in the lower oil chamber 197 has a larger area than the downward pressure receiving surface 200, the valve spool 23
to retreat. As a result, the high pressure conduit 194 increases the pressure in the lower oil chamber 206 in order to communicate with the (24) second switching conduit 204 via the intermediate small diameter portion 202 of the valve spool 23 . As a result, since the upward pressure receiving surface 210 of the piston large diameter portion 208 has a larger area than the downward pressure receiving surface 190, the piston 12 begins to retreat. When the piston 12 retracts almost to the top dead center, the small diameter portion 212 between the large diameter portions 188 and 208 allows the intermediate oil chamber 192 to communicate with the low pressure conduit 214, so that the switching conduit 195 connected to the intermediate oil chamber becomes the low pressure conduit. It communicates with 214. As a result, the switching conduit 195
Since the pressure in the lower oil chamber 197 connected to the lower oil chamber 197 becomes lower, the valve spool 23 is moved forward by the downward pressure receiving surface 200 disposed in the intermediate oil chamber 216 connected to the high pressure conduit 194.

Due to this forward movement, the switching groove connected to the lower oil chamber 206,
Pipe 204 communicates with low pressure conduit 214 via an upper oil chamber 218 of valve spool 23 . By lowering the pressure in the lower oil chamber 206, the downward pressure receiving surface 190 of the piston large diameter portion 188
Since the upper oil chamber 196 in which the lead rod 5 is located is always connected to the high pressure conduit 194, the piston 12 moves forward and hits the rear end surface of the lead rod 5, and during this advancement, the lower oil chamber 20
The hydraulic fluid rapidly discharged from switching conduit 204. Variable oil chamber 22 via upper oil chamber 218 and low pressure conduit 214
Flows into 0. The accumulator 25 is used to smooth out hydraulic pulsations caused by the reciprocating movement of the piston 12. When the forward movement of the piston 12 is completed, the above-described stroke is repeated to continue the striking operation.

The impact force of the piston 12 is transmitted to the bit 6 via the lead rod 5 and the hollow rod 7, and at the same time, the impact force is transmitted to the bit 6 via the lead rod 5 and the hollow rod 7.
The hollow rod 7 or bit 6 is rotated by O.

Compressed air from the compressor, which is still external, enters through conduit 56, as shown in FIG. It flows through the hole 48, passes through the inner cylindrical portion 74 of the hollow rod 7 and the center hole 100 of the mounting member 92 shown in FIG. 9, passes through the center hole 112 of the bit 6, and is ejected from the tip of the bit. This blows away the boring powder that tends to accumulate at the location of the drilled hole 222 (FIG. 12) and speeds up the drilling process. It is sucked into the vertical hole 94 of the mounting member 92 and rises through the cylindrical space between the outer cylindrical part 76 and the inner cylindrical part 74 of the hollow rod 7, and even when the hollow rod 7 is rotating, the rear end of the rod is Through hole 7
8 to the through hole 81 of the bushing 80 and the support member 82
The dust passes through the conduit 83 and is collected in an external dust collector. At this time, the circular plane dust removal hood 96 advances into the hole 222 being drilled as the hollow rod 7 moves forward as the drilling progresses with the bit 6, and the annular member 98 fixed to the outer periphery of the hood is attached to the hole wall. come into contact with. As a result, a reduced pressure is generated between the perforated portion in the perforated hole 222 and the dust removal hood 96, and the dust suction by the external dust collector can be effectively achieved. The large-diameter bit 6 that performs drilling is stably held by a hollow rod 7 with a relatively large outer diameter, and is connected by a spline to a cotter pin 110 □
It is removably and firmly connected to the hollow rod 7 by. The drilled hole 222 can be formed to a depth of, for example, about 2 m (27) by one drilling with the large-diameter bit 6, and when the drilled hole is large or the location to be drilled is particularly hard, impact force or rotational force may be applied. Depending on the situation, the desired hole diameter may be achieved by double or more drilling using a pit l-6 and a finishing bit.

The drilling rock according to the present invention has a striking mechanism and a rotation mechanism installed independently, so that the striking mechanism can be installed according to the rock quality and hole diameter to generate a suitable striking force, and it can be used in hard rock areas or on concrete paved roads. However, relatively large diameter holes can be easily drilled. Therefore, the use of the rock drill of the present invention is much more efficient than the conventional manual digging work, and is also economically advantageous when labor costs and construction period are taken into consideration. The holes that can be formed with the rock drill of the present invention are generally larger in diameter than those made with known large rock drills, so they can be used, for example, to erect utility poles or steel towers in hard rock areas, or to install utility poles or guardrails on concrete paved roads. It is convenient to use when erecting etc. Since the rock drill of the present invention can be mounted on an appropriate self-propelled truck via a bracket, it can be adapted to the environment of the place to be drilled (28). Using a running truck is advantageous in terms of overall civil engineering costs.In addition, in the rock drilling of the present invention, in order to stably hold a heavy and large diameter bit, a relatively large diameter bit such as a double tube is used. A hollow rod is used.Furthermore, in the rock drill according to the present invention, in order to effectively remove the cutting powder generated during drilling, a circular plane dust removal hood is attached to the hollow rod, and the dust removal hood is used to remove drilling particles as the drilling progresses. Since it enters the hole, it increases the suction of the sawdust by the dust collector.Furthermore, if the sawdust being sucked passes through a double cylindrical hollow rod, the dust collection hose becomes an obstacle during drilling work. Another advantage is that the possibility of accidentally damaging the dust collection hose is reduced.

[Brief explanation of drawings]

FIG. 1 is a front view showing a rock-throwing rock according to the present invention with the rotation mechanism omitted, and FIG. 2 is a schematic side sectional view of the rock-throwing rock according to the present invention.
FIG. 3 is a longitudinal sectional view of a striking device used as an example of the striking mechanism of the present invention, FIG. 4 is a schematic longitudinal sectional view showing an example of the lower part of the striking mechanism and the rotation mechanism of the present invention, and FIG. Fig. 4 is a schematic sectional view taken along line V to V, Fig. 6 is a schematic sectional view taken along line VI-VI, l (J) in Fig. 4, and Fig. 7 is a relay section of the hollow rod. , FIG. 8 is a schematic sectional view taken along the line VHI-Vm in FIG. 7, FIG. 9 is a schematic longitudinal sectional view showing an example of the lower part of the hollow rod, and FIG. A schematic cross-sectional view of the several-piece member cut along the line X-X in Figure 9, and Figure 11 is the
I-XI? A schematic cross-sectional view of the mounting part taken along line A, Fig. 12 is a side view showing the state in which the rock drill according to the present invention is mounted on a power shovel, and Fig. 13 shows the state in which the bracket is attached to the rock drill according to the present invention. FIG. 14 is a schematic sectional view taken along the line XIV-XIV in FIG. FIG. 17 is a schematic vertical cross-sectional view showing a modification of the dust removal hood used in the present invention, and FIG. 18 is a vertical cross-sectional view showing an example of the piston operating principle of the striking mechanism in the present invention. DESCRIPTION OF SYMBOLS 1... Drilling Iwatsuki, 2... Impact mechanism, 3... Rotating mechanism, 7... Hollow rod, 8... Guide cell, 9-mount bracket, lO... Hydraulic motor, 11... Housing, 12...Piston, 58...Connecting member, 60...
- Tightening member, 74... Inner cylinder part, 76... Outer cylinder part, 8
2... Support member, 86... Relay member, 92... Mounting member, 94... Vertical hole, 96... Dust removal hood, 98
... Annular member, 110 ... Kota pin. Applicant Okada Kaoru Iwaki Co., Ltd. Teikoku Tsunai Seisakusho Co., Ltd. Agent Patent Attorney Akio Kanzaki JP 58-218584 (1G) 4th Ward Totsai JP 58-218584 (13)

Claims (1)

[Scope of Claims] 1. A rock-pounding tool in which a striking mechanism and a rotating mechanism are installed independently on a movable plate, wherein the rotating mechanism rotates a lead rod and is movable via a housing that houses the rod. A relatively large-diameter pit is removably attached to the tip of a hollow rod that is fixed to the plate and connected to the lead rod, and the elongated guide cell to which the movable plate is slidably attached can be moved by itself via a bracket. A large-diameter hole drilling rock that can be mounted on a trolley, and a striking mechanism is installed behind a rotating mechanism on a movable plate to directly or indirectly strike the rear end face of a lead rod with a piston. 2. The hollow rod has a double cylinder shape, and the inner cylinder part is a blow passage through which the compressed air from the conopressor flows through the center hole of the lead rod, and the outer cylinder part is connected from the vicinity of the bit to the dust collector. The drilling rock according to claim 1, characterized in that it constitutes a communicating dust removal passage. 3. Attach a circular plane dust removal hood to the front part of the hollow rod close to the bit, and set the outer diameter of the hood to be approximately equal to the bit diameter, and set the hood so that the outer diameter is approximately equal to the bit diameter, and between the front end of the hood and the rear end of the bit. Claim 1, characterized in that by opening the front end of the dust removal passage, the dust removal hood that enters into the drilling hole as the bit moves forward effectively removes the shavings formed by the bit. Nosaku Iwatsuki. 4. A relatively large-diameter bit is spline-connected to the hollow rod at the front end of the rod, and is removably fixed to the hollow rod using a cotter pin. When drilling with the bit, first use a parent-child bit to form a drilling hole; The rock drill according to claim 1, wherein the drill bit is then replaced with a finishing bit to widen the hole to a predetermined diameter.