JPH0123640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a rock drill having a dust removal hood on a work platform that allows an operator to easily confirm the position of a drilling hole.

(Conventional technology) Various types of rock drills and augers are used to make holes in quarries or when erecting electrical or steel towers, and crawler drills and leg drills are used to drill holes in hard rock areas. It's normal. Crawler drills with good drilling efficiency produce a large amount of waste during drilling, and if this is released directly into the air, it will generate dust and worsen the working environment. For this reason, in large crawler drills, the dust collector is set on the trolley.
By connecting a hose from the dust collector to a dust removal hood on the surface of the perforation, the generated chestnut powder is sucked into the dust collector.

(Problems to be Solved by the Invention) A conventional dust removal hood is generally installed at the tip of a guide cell in a crawler drill, surrounds a rod to which a bit is connected to the tip, and is positioned on the surface of a drilled hole during drilling. For this reason, the dust removal hood completely covers the surface position of the drilled hole, making it difficult for the operator in the driver's seat of the crawler drill to confirm the position of the drilled hole, which may result in the wrong drilling position.

(Means for Solving the Problems) As a result of studying the above-mentioned problems regarding conventional dust removal hoods, the present inventor attached the dust removal hood to the front part of the rod, and as the bit moves forward, the dust removal hood becomes perforated. It has been found that once inside the hole, the operator can easily confirm the location of the drilled hole on the work trolley.

In the present invention, the rock drill 1 includes a hollow rod 7
Dust removal hood 9 with a substantially circular plane to be attached to the front part of the
It has 6. This dust removal hood is, for example, approximately umbrella-shaped or elongated cylindrical. A dust removal passage for removing the cuttings produced by the bit is formed inside or outside the hollow rod 7, and the front end of the dust removal passage is opened between the front end of the hood and the rear end of the bit. This dust removal passage may be formed by the outer cylindrical portion 76 of the hollow rod 7 as shown in FIG. may be configured. Although this dust removal passage is usually a passage through which air containing leftover flour passes, it can also be set to pass compressed air before removing leftover flour, if desired.

(Function) In the rock drill 1 of the present invention, by setting the outer diameter of the dust removal hood 96 to be approximately equal to the diameter of the bit 6, the dust removal hood 96 can be adjusted as the bit 6 moves forward.
enters the drilled hole. The chestnut powder sucked from the dust removal hood 96 passes through the dust removal passage inside the rock drill 1.
Collect it in a dust collector (not shown) set on a trolley.

(Example) To explain the present invention based on the drawings, FIGS. 1 and 2 show a rock drill 1. FIG. 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 rotates by the rotating mechanism 3, and a bit 6 that is connected to the lead rod and can be detached from its tip. A hollow rod 7 is attached to the movable plate 4, and an elongated guide cell 8 to which the movable plate 4 is slidably attached is provided. The rotation mechanism 3 is composed of, for example, a hydraulic or pneumatic motor. In FIG. 2, the hydraulic motor 10 is installed on a housing 11 housing a lead rod, and the housing is fixed to the movable plate 4 at approximately the center in the longitudinal direction. . On the other hand, the striking mechanism 2 utilizes various types of hydraulic or pneumatic striking devices, or is composed of a dedicated striking device, is installed behind the rotating mechanism 3 on the movable plate 4, and is directly or The rear end surface of the lead rod 5 is indirectly hit.

A striking device 13 used as an example of the striking mechanism 2
As shown in FIG. 3, the striking device 13 has a substantially prismatic elongated cylinder 14 in which a substantially cylindrical elongated piston 12 is slidably housed. 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 then side rods (not shown) are erected at the four corners of the cap 15, and the cylinder The back cap 14a, the cylinder 14 and the front cap 15 are fixed to each other by tightening the side rod nut 18 through the back cap 14a above the cylinder 14. A chisel 19 is inserted into the center hole of the front cap 15, and a pin 21 inserted horizontally through the long groove 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, and hydraulic oil is supplied and discharged to and from the piston 12 and the valve spool 23 via nipples 24, 24 installed 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. To install this striking device 13 on the rock drill 1, it is first necessary to pull out the pin 21, remove the drill 19, loosen the side rod, and remove the front cap 15.
After this, as shown in FIG. 4, a separate cap 26 is attached in contact with the rear end surface of the housing 11 of the rotating mechanism 3.
Place the shank button 16 in the center hole.
Next, the front sleeve 27 (FIG. 5) is erected and fastened with the nut 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. Further, a pair of parallel brackets 28, 28 are fixed on the movable plate 4 at right angles to the movable plate 4, and a cylinder 14 is arranged between both parallel brackets.
The cylinder 14 is held by tightening as shown in the figure. The parallel brackets 28, 28 are connected by a horizontal beam (not shown) located below, and are fixed to the movable plate 4 by bolts, welding, or the like. In the striking mechanism 22 installed in this way, the piston 1 is
2 reciprocates in the axial direction within the cylinder 14, and this hydraulic oil is fed and discharged via nipples 24, 24 and a hose (not shown) connected to the nipples, for example, to a power shovel 30 (see FIG. 12).
by communicating with the hydraulic power source and tank. Although this striking mechanism 2 is not normally replaced in a complicated manner, if a particular striking force is required depending on the rock quality of the place to be drilled and the diameter of the hole, the bolt 29 of the parallel bracket 28 and the side rod nut may be replaced. 18, the cylinder 14 is removed, and a new striking device having the desired striking force and number of strikes is installed as the striking mechanism in the present invention. At this time, since the piston diameters usually differ, the bushing 16, sleeve 17, and cap 26 are often replaced at the same time, and since 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, 28 can be adjusted by loosening the bolts or reset to a predetermined spacing 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 the embodiment 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 example. In FIG. 4, the lead rod 5 is arranged along the longitudinal center of the movable plate 4, and an axial protrusion 32 is formed on the peripheral wall behind the central portion of the rod so as to have, for example, a cross section. Furthermore, by forming a predetermined number of engagement grooves 38 corresponding to the protrusions 32 in the center hole 36 of the reduction gear 34 that fits into this part of the lead rod 5, the lead rod 5 can be connected to the reduction gear 34 and the shaft as shown in FIG. It can be splined so as to be movable in the direction. A drive gear 40 that meshes with the reduction gear 34 is fixed to a rotating shaft 44 of the hydraulic motor 10 by a key 42 and protected by a cover 46 . Lead rod 5 and reduction gear 34
Due to the axially movable spline connection with the lead rod 5, even if 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 center 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 48, 50, 52 and the conduit 56 are part of the blow passage. Configure. It is preferable that the upper and lower ends of the bushing 52 are brought into airtight contact with the outer peripheral wall of the lead rod 5 and the inner peripheral wall of the housing at the center of the lead rod 5.

The hollow rod 7 is coaxially and removably connected to the front end of the lead rod 5, and for this purpose the rod 7
A thick-walled cylindrical connecting member 58 having a diameter substantially equal to the outer diameter of the connecting member 58 and a tightening member 60 disposed perpendicularly above the connecting member are used (see FIGS. 4 and 6).

At the front end of the lead rod 5, an axial protrusion 62 is provided 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, while an axial protrusion corresponding to the protrusion 62 is provided above the inner circumferential wall of the connecting member 58. Matching groove 6
4 are formed in a predetermined number, the lead rod 5 and the connecting member 58 are spline-coupled, and both are further fixed with a tightening member 60 to prevent the hollow rod 7 from falling off. This spline connection is suitable for increasing the contact area between both members and reliably transmitting rotational force.
Furthermore, it is of course possible to use other coupling 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 lateral through holes 68, 68 are formed parallel to the diametrical 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, the pair of comb-like semicircular parts 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 firmly tighten the bolts 72, 72. The inner cylindrical part 74 of the hollow rod 7 is inserted airtightly into the lower part of the inner circumferential wall of the connecting member 5, and the outer cylindrical part 76 is inserted into the lower part of the inner circumferential wall of the connecting member 5.
Both cylindrical parts 7 are screwed airtightly to the lower part of the outer peripheral wall of 8.
4 and 76 are arranged concentrically. The center hole 77 of the connecting member 58 has a smaller diameter than the inner diameter of the inner cylindrical portion 74 almost at the center. Further, a predetermined number of through holes 78 are provided near the rear end of the outer cylindrical portion 76, and are further connected to an external dust collector (not shown) via a through hole 81 of a perforated bushing 80 and a conduit 83 of a support member 82. That is, the holes 78, 81 and the pipe line 83 constitute a part of the dust removal passage. Bushing 8
The upper and lower ends of the bushing are brought into airtight contact with the outer circumferential wall of the outer cylinder part 74 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 the support member 82 is fixed to the front of the movable plate 4, it stably supports the hollow rod when the movable plate 4 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. For connecting hollow rods,
As shown in Fig. 7, a thick-walled cylindrical relay member 86 having a diameter approximately equal to the outer diameter of the rod is used, and the inner cylindrical portion 74a of one hollow rod is airtightly inserted above the inner circumferential wall of the relay member 86, and the The cylindrical portion 76a is screwed to the upper part of the outer peripheral wall of the relay member 86 in an airtight manner, and the inner cylindrical part 74b of the other hollow rod is hermetically inserted to the lower part of the inner peripheral wall of the relay member 86, and the outer cylindrical part 76b is screwed to the upper part of the outer peripheral wall of the relay member 86. Screw it airtightly to the lower part of the outer peripheral wall. 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 predetermined number of relay members 86 are used depending on the depth of the large diameter hole to be drilled and the length of the hollow rod 7.
If the depth is shallow, it may not be used. At the front end of the hollow rod 7, as shown in FIG. The outer cylindrical portion is hermetically inserted into the upper part of the outer circumferential wall of the mounting member 92 with screws to maintain the concentric arrangement of both cylindrical portions 74 and 76.
Vertical holes 94 (FIG. 10) are provided at predetermined intervals in the circumferential direction on the upper end surface of the mounting member 92, and the upper end 94a of each vertical hole is connected to the outer periphery of the inner cylindrical portion 74 and the outer cylindrical portion 76.
The lower end portion 94b of each vertical hole extends diametrically outward to the outer peripheral surface of the mounting member 92, and forms a part of the dust removal passage. For example, it is preferable that the dust removal hood 96, which has a circular plane shape, be bolted to the outer cylindrical portion 76 of the hollow rod 7 in a position close to the bit 6 behind the lower end portion 94b of each vertical hole. The shape of the dust removal hood 96 in the present invention may be a conical shape as shown in FIG. 1, a flat crown shape as shown in FIG. 9, or a bowl shape. The outer diameter of the bit 6 is determined to be approximately equal to the diameter of the bit 6,
The annular member 98 constituting the outermost diameter portion is preferably an elastic member such as rubber. The annular member 98 is
It is bolted to the lower peripheral surface of the dust removal hood 96. As a result, as the hollow rod 7 advances, the bit 6 forms a perforation hole, and the dust removal hood 96 also subsequently enters the perforation hole, and at this time, the dust removal hood 96 brings the annular member 98 into contact with the hole wall. As a result, the turning powder formed by Bit 6 can be effectively removed. Dust removal hood 96 and annular member 98
can be replaced depending on the diameter of the bit 6. On the other hand, the central hole 100 of the mounting member 92 has a diameter smaller than the inner diameter of the inner cylinder part 74 at the center thereof, and furthermore, an engagement groove 102 is formed in the lower part so as to have a substantially cross-shaped cross section (10th
(Fig. and Fig. 11). The rear part 104 of bit 6 is
It has an axial protrusion 106 that corresponds to the engagement groove 102 so that it can be fitted into the lower part of the center hole of the mounting member 92, thereby spline-coupling the mounting member 92 and the bit 6. Further, a pair of horizontal holes 108, 108 are provided in the lower outer circumferential wall of the mounting member 92, parallel to the diameter direction and offset from the center. Form. For example, rod-shaped cotter pins 110, 110 having a rectangular cross section, which correspond to the horizontal hole 108, are connected to the horizontal hole 1.
08, a spring pin 110 is driven into the concave wall between both horizontal holes 108 and fixed.
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 92 is inserted into the bottomed hole. , both may be fixed with a plurality of pins. A center hole 112 is provided in the rear part 104 of the bit, and the center hole communicates with a 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 and child bit as shown in FIG. It reaches the surface and blows out compressed air from here (second
(see figure). Although not shown, a finished bit may be used depending on the size of the hole to be drilled or the rock quality of the location to be drilled. It is preferable to have a structure in which, for example, a plurality of button bit pieces are embedded radially on the enlarged periphery.

The guide cell 8 is constructed by, for example, as shown in FIG. 14, two long channel steel members 115, 115 are arranged parallel to each other with their openings facing outward, and both channel steel members are connected to a plurality of connecting rods 116. They are fixed at predetermined intervals. As is clear from Figures 2 and 13,
At the rear end and front end of the guide cell 8, sprockets 1 are installed at the channel steel members 115 and 115, respectively.
18 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 edge 124 of the guide cell 8 on the lower side by a large number of bolts 123 (FIG. 1) arranged along both side edges. As a result, the movable plate 4 can freely slide along the guide cell 8, and the sprocket 1
By rotating 18, the movable plate 4 can be moved via the chain 122. The rotation of sprocket 118 is
Hydraulic feed motor 1 installed at the rear end of the guide cell
26. Further, a foot pad 127 is fixed to the lower front end of the guide cell 8 to support the entire rock drill during drilling work (see Fig. 12), and the foot pad is located further away from the hollow rod 7 than the guide cell 8 is. It extends further forward in parallel with the guide cell 8. The footpad 127 is made of, for example, a single piece of steel having an I-shaped cross section, and its side surface is tapered at the front. Further, above the front end of the guide cell 8, there is a centralizer 12 that holds the hollow rod 7 when not drilling.
8, and the centralizer includes semicircular annular members 130, 130 whose inner diameter is approximately equal to the rod diameter.
Consisting of Both annular members 130, 130 have bolts 132 (FIG. 1) inserted through their upper flanges.
It is possible to close and fix the hole with the bolt 132 and open it outward by removing the bolt 132 during the drilling operation. For this purpose, both annular members 130, 130 are pivotally connected to a mounting bracket (not shown) fixed on the guide cell 8, and a suitable bushing 134 (second It is preferable to attach the following.

An example of a bracket 9 for mounting the rock drill 1 on a suitable self-propelled truck is shown in FIGS. 12 to 14, and the bracket is positioned approximately at the center of the guide cell 8 as desired, for example. . When the bracket 9 is viewed from the front, as shown in FIG. 13, there is, for example, a horizontally long rectangular bracket body 136,
In FIG. 4, the mounting plate 138 is arranged on the left side thereof. The mounting plate 138 has a rectangular shape, and the lower side edge 14 of the guide cell 8 is attached to the upper surface of the mounting plate 138 in the longitudinal direction.
0 and 140 are abutted, and pressing pieces 142 and 142 are placed on both lower side edges, and then the guide cell is fixed to the mounting plate 138 by tightening with a 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 body 136 in parallel with the upper surface thereof, and the rear end of the tube 154 is pivoted above the right side end of the bracket body 136, and the front end of the piston rod 156 is attached to the right side of the mounting plate 138. By pivoting the end downward, it is arranged diagonally with respect to the mounting plate. As a result, when the piston rod 156 of the hydraulic cylinder 152 is extended, the mounting plate 138, that is, the guide cell 8 is moved into the first position with the protrusion 146 as the center.
If the guide cell 8 can be rotated clockwise in FIG. 3 and the piston rod is contracted, 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 152 may be covered with a suitable cover (not shown) to prevent ingress of dust. The bracket body 136 also has a pair of juxtaposed plates 158, 1 on its right side at right angles to the bottom surface.
58, the juxtaposed plates have a substantially triangular side profile (see FIG. 12), and are each provided with a pair of pin holes 160, 160 spaced apart at a predetermined distance.
Between the juxtaposed plates 158, 158, the tip of the arm or boom of a suitable self-propelled truck and a bucket link or piston rod are arranged, and the pin is inserted into the hole 16.
0.160 and pivotably attach it. 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.

15 and 16 show modified examples of the rock drill, and as the striking mechanism 163 of the rock drill 162, the striking device 13 as illustrated in FIG. 3 can be used as is. That is, in the striking device 13, when the pin 21 is attached/detached and the chisel is replaced with a shorter cylindrical chisel 164, the striking device is directly attached to the parallel brackets 166, 1 on the movable plate 165.
It should be installed between 66 and 66. 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 (first
(See the two-dot diagonal line in Figure 6). On the other hand, a hydraulic motor 168 serving as a rotation mechanism is fixed onto a movable plate 165 via a housing 169 that houses a lead rod 167. and the reduction gear 171 and lead rod 16
7 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 with a blow passage.
Bottomed holes 17 are provided on the front and rear end surfaces of the hollow rod, respectively.
3,174, the front part of the lead rod 167 is fitted into one of the bottomed holes 173 and fixed with a bolt pin 175, and the rear part of the bit 176 is fitted into the other bottomed hole 174. Kottapin 17
It stops at 7. Further, a footpat 179 fixed to the front end of the guide cell 178 is composed of a pair of parallel bars, and the tip thereof has a conical point. The rock drill 162 in this embodiment is equipped with a dust removal hood 180 as shown in FIG. 17, if desired. The dust removal hood 180 has an elongated cylindrical shape that generally corresponds to the hollow rod 172 and has an inner diameter larger than the diameter of the hollow rod 172 but an outer diameter smaller than the diameter of the bit 176. An annular member 181 is fixed inside the rear end of the dust removal hood 180,
and a brush 1 in an outward annular shape on the outside of the front end of the hood.
82 may be buried. When the annular member 181 is attached to the rear of the hollow rod 172, the dust removal hood 1
80 has a downward opening and is arranged coaxially with the hollow rod 172 by a spacer 183. If a through hole 184 provided at the rear end of the dust removal hood 180 is connected to a hose of a gathering machine (not shown), the cutting powder generated in the bit 76 can be sucked into the dust collector through the dust removal hood 180. At this time, use the dust removal hood 1
The front end of the bit 80 is located slightly behind the bit 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. Although not shown, the annular member 181 is attached to the hollow rod 1 by a known combination of an annular groove and an annular protrusion.
Even if the dust removal hood 180 is installed rotatably on the circumferential surface of the rod 72, the dust removal hood 180 is kept non-rotatable with respect to the rotation of the rod. In addition, the dust removal hood 180 itself is a hollow rod 1.
The structure may be such that the through hole 184 is covered with a cover that does not rotate even if it rotates with 72, and a hose is connected to the cover. In normal cases, the striking device 13 is mounted as a breaker on a power shovel or the like, and only when drilling is required, it is attached to the rock drill 162 as a striking mechanism 163, and once the drilling work is completed, it can be used again as a breaker. The rock drill 162 should rather be classified as a percussion device attachment, since it is easy to do so.

The self-propelled truck on which this rock drill 1 is mounted is the 12th
In addition to the power shovel 30 as illustrated in the figure,
It may be a back platform or a trolley of a crane, and the traveling body may be a crawler as shown in the figure, or a wheel-type or truck-type traveling body may be used to improve transportability. As shown in the figure, in the case of a power shovel 30, the weight of the rock drill 1 is generally quite large as the striking force and rotational force of the rock drill 1 increases, so in order to prevent the arm from deforming or breaking, the arm is removed and attached directly to the boom 186. Although it is attached, if it is a large power shovel, it is also possible to pivot it to the arm and bucket link.

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 hollow rod 7, that is, the bit 6 is rotated by the hydraulic motor 10. Further, compressed air from an external compressor flows through the conduit 56 as shown in FIG. 48, and the inner cylindrical portion 74 of the hollow rod 7 and the mounting member 9 shown in FIG.
Through the center hole 100 of bit 2, the center hole 11 of bit 6
2 and ejects from the tip of the bit. This blows away the cutting powder that tends to accumulate at the location of the drilled hole 222 (FIG. 12), thereby speeding up the drilling process. The sawdust generated by drilling is removed from the mounting member 9 located below the dust removal hood 96.
2, 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, it is sucked into the through hole 78 at the rear end of the rod. The dust passes through the through hole 81 of the bushing 80 and the conduit 83 of the support member 82, 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 attaches to the hole wall. come into contact with. As a result, the hole to be drilled in the hole 222 and the dust removal hood 9 are separated.
6, a vacuum is generated between the two and 6, so that the dust can be effectively sucked by the external dust collector. A large-diameter bit 6 for drilling is stably supported by a hollow rod 7 having a relatively large outer diameter, and is removably and firmly connected to the hollow rod 7 by a knock pin 110 and a spline connection. The drilling hole 222 can be formed to a depth of, for example, about 2 m by one drilling with a large-diameter bit 6, and when the drilling hole is large or the location to be drilled is particularly hard, the drilling hole 222 can be formed to a depth of about 2 m depending on the impact force or rotational force. The desired hole diameter can be achieved by drilling two or more times using the bit 6 and the finishing bit.

(Effects of the Invention) In the rock drilling machine according to the present invention, the dust removal hood enters the drilled hole as the bit moves forward, so that the operator can easily confirm the position of the drilled hole on the work cart. In this rock drill, the sawdust sucked from the dust removal hood is generally connected to a dust collector via a hose through the dust removal passage of the rock drill, thereby collecting the generated sawdust in the dust collector and preventing deterioration of the working environment. The dust removal hood of the present invention can be installed on a large crawler drill or tunnel master, etc., since it is easy to confirm the position of the drilling hole even when it is attached to a rock drill.

[Brief explanation of drawings]

Fig. 1 is a front view showing a rock drill having a dust removal hood according to the present invention with the rotating mechanism omitted, Fig. 2 is a schematic cross-sectional view of the rock drill shown in Fig. 1, and Fig. 3 is an example of a striking mechanism. 4 is a schematic vertical sectional view showing an example of the lower part of the striking mechanism and the rotation mechanism; FIG. 5 is a schematic sectional view taken along the line - in FIG. 4; Figure 6 is a schematic cross-sectional view taken along the - line in Figure 4, Figure 7 is a schematic longitudinal cross-sectional view showing the relay part of the hollow rod, and Figure 8 is a schematic cross-sectional view taken along the - line in Figure 7. 9 is a schematic longitudinal sectional view showing an example of the lower part of the hollow rod, FIG. 10 is a schematic sectional view of the mounting member cut along the - line in FIG. 9, and FIG. A schematic sectional view of the mounting member cut along the line XI-XI in the figure, Figure 12 is a side view showing the rock drill mounted on the power shovel, and Figure 13 shows the rock drill with the bracket attached. Front view showing,
Fig. 14 is a schematic sectional view taken along the - line in Fig. 13, Figs.
FIG. 7 is a schematic vertical sectional view showing a modification of the dust removal hood according to the present invention. DESCRIPTION OF SYMBOLS 1... Rock drill, 5... Lead rod, 6... Bit, 7... Hollow rod, 74... Inner cylinder part, 76... Outer cylinder part, 96... Dust removal hood.

Claims (1)

[Claims] 1. A dust removal hood with a substantially circular plane is attached to the front part of the hollow rod in close proximity to the rear end of the bit, and a dust removal passage for removing the turning powder generated in the bit is provided inside the hollow rod. Alternatively, by forming the dust removal passage on the outside and opening the front end of the dust removal passage between the front end of the hood and the rear end of the bit, as the bit moves forward, the dust removal hood always maintains a constant distance from the bit in the drilling hole. A rock drilling device characterized in that the outer diameter of the hood is set to be approximately equal to the diameter of the bit so that the dust removal hood can enter the hole, and an elastic member or brush is attached to the peripheral surface of the front end of the dust removal hood so that the dust removal hood is always in contact with the wall of the drilled hole. Machine. 2. The rock drill according to claim 1, wherein the dust removal hood is approximately umbrella-shaped, and the outer cylinder portion of the hollow rod having a double cylinder shape constitutes the dust removal passage. 3. The rock drill according to claim 1, wherein the dust removal hood has an elongated cylindrical shape, and the dust removal passage is formed inside the dust removal hood, which is arranged coaxially with the hollow rod.