JP2518658Y2 - Rotary drilling tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rotary drilling tool used for drilling a hard non-metallic material such as stone, concrete, porcelain tile, glass, and ceramics. The present invention relates to a rotary drilling tool having a structure in which a cutting blade at the tip is cooled by a mist.

[Conventional technology]

In this type of drilling tool, cooling fluid such as water or air is supplied to cool the cutting blade in order to reduce wear of the cutting blade due to friction heat during drilling, but in the case of water,
There is a problem that the working area is polluted by generating suspended water mixed with cutting chips, and in the case of air, the cooling efficiency is low.

Therefore, the applicant of the present invention, for example, the one described in Japanese Utility Model Laid-Open No. 1-153911, uses a mist as a cooling fluid that has both the advantage of water having high cooling efficiency and the advantage of air not causing a pollution problem. I proposed the structure of supplying as.

This is equipped with a rotary drill having a through hole in the axial direction and a cutting blade at the tip, and also equipped with spraying means (mist generating means) connected to an air supply source and a water source, so that the mist generated by the spraying means It has a structure in which it is guided to a rotary drill and ejected from a cutting blade.

Further, air or mist cannot prevent the scattering of cutting chips at the time of drilling, but in order to prevent this, conventionally, a cover member that covers the outside of the rotary drill in the axial direction is provided and the cover member is provided. A dust collector is connected to the discharge port of the device to suck the cutting waste accumulated in the cover member.

[Problems to be solved by the device]

By the way, in the case of using the dust collector as described above, when the length of the suction hose increases, the so-called conduit resistance increases and the suction force decreases, so the length of the suction hose is usually set to be short. However, in this case, the range of use of the drilling tool is narrowed, and the maneuverability or the handleability is deteriorated, resulting in a decrease in workability. That is, when the working position changes significantly, it is necessary to move the dust collector in accordance with the movement of the drilling tool, which is troublesome.

Further, since the suction hose has a larger diameter than an air hose or the like, it gives a heavy load to the maneuverability of the drilling tool, and from this point also the workability is deteriorated.

Furthermore, the dust collector-equipped system causes an increase in equipment cost as compared with an air supply source such as an air compressor.

As described above, while the use of the mist improves the cutting efficiency, it has a problem due to the form of dust collection.

Therefore, an object of the present invention is to provide a rotary drilling tool capable of solving the problem of dust collection and simplification of the entire equipment, and making full use of the advantages of using a mist.

[Means for solving the problem]

This invention was devised to achieve the above-mentioned object, and its features are a rotary drill provided in the tool body, having a through hole in the axial direction and a cutting blade at the tip, and a mist supply path for this rotary drill. And a mist generating means for generating mist which is ejected from the cutting blade and is connected through an air supply path common to the mist generating means through an air supply path to remove cutting chips by a negative pressure action by air discharge. A dust collecting means for discharging, a mist opening / closing member provided in the mist supply passage, and a dust collecting opening / closing member provided in the air supply passage are provided, and the mist opening / closing member and the dust collection opening / closing member are opened and closed at substantially the same time. In the configuration.

[Action]

According to this invention, the mist generated by the mist generating means is guided to the rotary drill with the mist opening / closing member in the open state via the mist supply passage, and is ejected from the cutting blade. This cools the cutting blade.

The air from the air supply source is sent to the mist generating means, is supplied to the dust collecting means with the dust collecting opening / closing member in the open state via the air supply passage, and the cutting dust is discharged by the negative pressure action of the air discharge. Due to the negative pressure effect of air discharge, a constant discharge capacity can be obtained without being affected by equipment factors such as hose length.

Also, since mist supply and dust collection can be performed with a single air supply source without the need for a dust collector, equipment costs are reduced and the structure is simplified, and the mist opening / closing member and the dust collection opening / closing member can be opened and closed at approximately the same time. As a result, backflow of mist due to pressure imbalance is prevented.

〔Example〕

 1 to 6 show an embodiment of the present invention.

A rotary drill 4 is attached to the tip side of the tool body 2, and a grip portion 6 is formed on the tip side of the tool body 2. A drive switch 8 for driving the rotary drill 4 is provided on the upper side of the handle portion 6, and a mist generating means 10 operable from the outside of the tool body 2 is provided on the lower side of the handle portion 4. It is provided. The mist generating means 10 is connected to the air supply source 14 via the air supply pipe 12,
It is connected to a water supply source (not shown) via a water supply pipe 16.

The mist generating means 10 is connected to the rotary drill 4 via the mist supply passage 18, and the air supply pipe 12 is connected to the dust collecting means 22 via the air supply passage 20. Also, mist common road
A mist opening / closing member 24 for opening / closing mist supply to the rotary drill 4 is provided at 18, and a dust collecting opening / closing member 26 for opening / closing air supply to the dust collecting means 22 is provided at the air supply passage 20. The mist opening / closing member 24 and the dust collecting opening / closing member 26 can be opened / closed simultaneously by the drive switch 8.

As shown in FIG. 2, the mist generating means 10 has a connecting member.
28 and an adjusting member 30 for adjusting the amount of water. The connection member 28 is formed with a connection port 28a for connecting the mist supply passage 18, a connection port 28b for connecting the air supply pipe 12, and a connection port 28c for connecting the water supply pipe 16.

In addition, the connection member 28 is formed with a guide path 28d for connecting the connection port 28a and the connection port 28b, and also with a water reservoir 28e. The guide passage 28d and the water storage portion 28e are communicated with each other through a communication hole 28f having a small diameter. Also, the connecting member 28
A screw hole 28g for attaching the adjusting member 30 is formed in the.

The adjusting member 30 includes, for example, a male screw portion 30a screwed into the screw hole 28g of the connecting member 28 and a needle portion 30 facing the communication hole 28f.
b and an adjusting knob 30c protruding outside the tool body 2. The amount of mist M produced is adjusted by the operation of the adjusting knob 30c. Compressed air flows from the air supply pipe 12 into the guide passage 28d and flows into the mist supply passage 18, whereby the guide passage 28d becomes a negative pressure state, and the needle portion 30b.
The water whose flow rate is regulated by is atomized.

Further, as shown in FIG. 3, the mist opening / closing member 24 slides in the connecting member 32 connecting the mist supply passage 18 and the inside of the connecting member 32 in association with the operation of the drive switch 8.
An opening / closing rod 34 for opening / closing 18 is roughly configured.
More specifically, the connection member 32 is formed with connection ports 32a, 32a for connecting the mist supply passages 18 at the upper and lower ends thereof, and a communication passage 32b is formed inside for communicating with these.

The opening / closing rod 34 includes, for example, a rod main body 34a integrally formed with the drive switch 8 and a head portion 34 located in the communication passage 32b.
It can consist of b and. Further, the connecting member 32 is provided with an inner guide 36 and an outer guide 38 for guiding the sliding movement of the opening / closing rod 34.

The inner guide 36 has an insertion hole 36a for the opening / closing rod 34 and a connection path 36b communicating with the communication path 32b. In addition, one side of the inner guide 36 is in contact with the lower surface of the head portion 34b of the opening / closing rod 34 to connect with the communication passage 32b.
A closed end edge 36c that closes the communication with 36b is formed.
In the figure, reference numeral 40 indicates a seal member.

The outer guide 38 is formed with an insertion hole 38a for the opening / closing rod 34 and a male screw portion 38b.
Correspondingly, a mounting screw hole 32c for the outer guide 38 is formed in the connecting member 32. Also, the outer guide 38 has
A flange 38c is formed to restrict the amount of screwing into the connecting member 32, and a spring accommodating recess 38d is formed so as to open toward the drive switch 8 side.

The drive switch 8 has a fitting recess for the outer guide 38.
8a is formed, and a spring member 42 for urging the return operation of the drive switch 8 is provided between the fitting recess 8a and the spring accommodating recess 38d of the outer guide 38. An O-ring 44 is provided on the contact surface between the inner guide 36 and the outer guide 38 to prevent the mist M from leaking. Reference numeral 46 is a seal member for ensuring airtightness between the outer guide 38 and the connecting member 32.

The dust collecting opening / closing member 26 is connected to the connection ports 48a, 48b of the air supply passage 20.
The structure is the same as that of the mist opening / closing member 24 except that the connecting member 48 having is different.

FIG. 3 shows a state in which the rotary drill 4 and the dust collecting means 22 are stopped and the mist supply passage 18 and the air supply passage 20 are closed. From this state, when the drive switch 8 is pressed in the direction of arrow T to drive the rotary drill 4 and the dust collecting means 22,
Inner guides for both the mist opening / closing member 24 and the dust collecting opening / closing member 26
Closing edges 36c, 36c of 36, 36 and head 34 of opening / closing rods 34, 34
The space between b and 34b is opened as shown by the chain double-dashed line. As a result, the communication passages 32b, 32b communicate with the connection passages 36b, 36b, the mist supply passage 18 communicates with each other, and the mist M is supplied to the rotary drill 4. At the same time, the air supply path 20 is connected to supply compressed air to the dust collecting means 22.

The rotary drill 4 is formed with an axial through hole 4a, and a cutting blade 50 formed by, for example, sintering diamond grains is attached to the tip of the through hole 4a. A jet port 50a is formed in communication with the hole 4a.
The mist M generated by the mist generating means 10 is guided to the rotary drill 4 via the mist supply passage 18 and ejected from the cutting blade 50. As a result, the cutting blade 50 is cooled, and early wear due to frictional heat during drilling is suppressed.

The dust collecting means 22 is roughly composed of a cover member 52 that covers the outside of the rotary drill 4 in the axial direction, and a dust collecting body 54. The cover member 52 has a contact portion 56 having an opening 56a.
A mounting portion 58 having a discharge port 58a, a contact portion 56 and a mounting portion 5
8 and a bellows portion 60 connecting between the two.

The bellows portion 60 is formed of, for example, an elastic material such as rubber or elastomer, and is capable of expanding and contracting according to the excavation movement of the rotary drill 4. The elasticity of the bellows portion 60 allows the cover member 52 to recover from its contraction by itself, but the abutment portion 56 and the attachment portion 58 have attachment pieces 56b and 58b, respectively.
Is installed to dispose the rod 62, and a spring 64 is attached to the rod 62.
It is also possible to insert and insert a spring-elastically forced return structure.

As shown in FIG. 4, the dust collecting body 54 has a discharge port 58, for example.
A nozzle member 66 connected to a and a dust bag 68 attached to the tip of the nozzle member 66 can be used.

As shown in FIG. 5, the nozzle member 66 includes an outer cylinder 70, an inner cylinder 72 mounted in the outer cylinder 70, and an air throttle member 74 mounted at the tip of the inner cylinder 72 in the outer cylinder 70. Made of. The outer cylinder 70 is composed of a large diameter portion 70a, a reduced diameter portion 70b, and a discharge port 70c to which the dust collecting bag 68 is attached, and the compressed air from the air supply passage 20 is taken into the side portion of the large diameter portion 70a. An ejection port 70d for ejecting the inside is formed. A ridge 70e that prevents the dust bag 68 from falling off is formed at the tip of the discharge port 70c.

The inner cylinder 72 is composed of a large-diameter portion 72a, a small-diameter portion 72b, and a tapered taper portion 72c.

The air throttle member 74 is formed in a ring shape, and its inner hole 74a is tapered with the same gradient so as to be fitted in close contact with the tapered portion 72c of the inner cylinder 72. Also, the inner hole 74a
Aperture hole 74b having an axis parallel to the inclination of inner hole 74a or taper 72c is formed in the periphery of. The inner cylinder 72 is fixed to the outer cylinder 70 by a means such as adhesion or press fitting with its large diameter portion 72a. In the mounted and fixed state, the large diameter portion 72a of the inner cylinder 72 is projected from the outer cylinder 70 by a certain size, and the discharge port 58a of the cover member 52 correspondingly corresponds to the small diameter portion 58b with respect to the inner cylinder 72 and the outer cylinder.
The stepped structure is composed of a large diameter portion 58c with respect to 70. Therefore, a strong connection can be obtained by means such as adhesion. Further, at the inner tip of the large diameter portion 70a of the outer cylinder 70,
A locking surface 70f for the air throttle member 74 is formed,
The air throttle member 74 can be held by being sandwiched between the taper portion 72c of the inner cylinder 72 and the locking surface 70f. With the inner cylinder 72 and the air throttle member 74 attached to the outer cylinder 70, the large diameter portion 70 of the outer cylinder 70
An annular air reservoir 76 as a pressure space is provided on the inner tip side of a.
Is formed.

When the compressed air is supplied through the air supply passage 20, the compressed air is ejected from the ejection port 70d to the air reservoir 76. Then, the pressure is increased by the air reservoir 76, and the air is ejected at high speed from the throttle hole 74b as indicated by the solid arrow. As a result, the inside of the inner hole 72d of the inner cylinder 72 is in a negative pressure state, and the cutting dust D in the cover member 52 is sucked into the nozzle member 66 as indicated by the broken arrow. The suctioned cutting dust D is discharged from the nozzle member 66.
It is accommodated in the dust bag 68 via 70c.

As described above, if the dust collecting body 54 is configured to have the negative pressure region on the discharge port 58a side and includes the nozzle member 66, and the dust collecting bag and 68, the suction path can be extremely shortened and the suction force can be supplied by the air. Since it does not depend on the length of the passage 20, a high suction force can always be obtained, and the chip discharging efficiency can be improved. Further, since the air supply path 20 having a relatively small diameter can be set as long as possible, the range of use of the drilling tool can be expanded and the weight load due to the hose length can be reduced, thus improving the mobility or handling of the drilling tool. Workability can be improved. Moreover, since a simple facility such as a compressor can be shared with the mist generating means 10 to obtain a suction force for discharging cutting waste, facility cost can be reduced.

Further, since the mist opening / closing member 24 and the dust collecting opening / closing member 26 can be opened and closed at the same time, the mist M caused by the pressure imbalance
Backflow (inflow into the dust collecting means 22) can be prevented.

Although a specific structure is shown in this example, the structure is not limited to this. In short, the air from the air supply source 14 can be ejected to the outside of the tool body 2 to suck the chips in the cover member 52. It is sufficient to form a pressure state, and various designs can be made within this range.

Next, a drive mechanism of the rotary drill 4 and a supply structure of the mist M will be shown as an example based on FIG. The dust collecting means 22
Is omitted.

A hollow member 80 is rotatably provided inside the tool main body 2 via bearings 82 and 84. Hollow member 8
0 is rotatably provided via bearings 86, 86, and is driven by a drive shaft 88 connected to an electric motor via gears 90, 92. A rotary connector 94 is fixed to the rear end of the hollow member 80, and the tool main body 2 is correspondingly fixed thereto.
Is a fixed connection body 96 in which a mist passage 96a is formed.
Is provided. A thrust bearing 98 is provided between the rotary connecting body 94 and the fixed connecting body 96, and O-rings 100 and 102 having different diameters are provided between the central portions of the two to form a two-stage sealing. There is. The mist supply device 18 from the mist generating means 10 side is connected to the mist passage 96a of the fixed connection body 96 by the connecting pipe 104.

A mounting recess 80a is formed at the tip of the hollow member 80 so that the tapered shank portion 4b of the rotary drill 4 can be mounted and the depth end can be fixed by screwing. Further, in order to reduce the adverse effect on the mist M due to the centrifugal force and the size of the passage area, a thin tube 106 having a tapered tip with a narrow mouth at the hollow member 80 has a fixed connection body 96 at the rear end. A thin tube 110 of the same shape is provided inside the rotary drill 4 via a spacer 108. The thin tubes 106 and 110 suppress the disappearance of the mist M. Reference numeral 112 indicates a material to be perforated such as concrete.

[Effect of device]

According to this invention, it is possible to improve the efficiency of perforation by cooling the mist and improve the efficiency of dust collection.

Since the dust collecting means is configured to discharge the cutting chips by the negative pressure effect of the air discharge, it is possible to always obtain a constant suction force that is not affected by the length of the air supply path, and to supply the same air as the mist generating means. In addition to the use of the source, there is no need for dust collector equipment, so that the equipment cost can be greatly reduced and simplified.

Further, since the mist opening / closing member and the dust collecting opening / closing member are opened / closed at substantially the same time, it is possible to avoid backflow of mist due to pressure imbalance, and maintain the merit by sharing the air supply source. it can.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a rotary drilling tool according to the present invention, FIG. 2 is an enlarged sectional view of a mist generating means portion, and FIG. 3 is an enlarged sectional view of a mist opening / closing member and a dust collecting opening / closing member. 4 and 5 are enlarged cross-sectional views showing the suction operation of the cutting dust of the dust collecting means, FIG. 5 is an exploded perspective view of the nozzle member of the dust collecting means, and FIG. It is sectional drawing which abbreviated the dust means. 2 ... Tool body 4 ... Rotary drill 4a ... Through hole 10 ... Mist generating means 14 ... Air supply source 18 ... Mist supply path 20 ... Air supply path 22 ... Dust collecting means 24 ... Mist opening / closing Member 26 …… Dust collection opening / closing member 50 …… Cutting blade D …… Cutting waste

Claims (1)

(57) [Scope of utility model registration request] 1. A rotary drill provided in a tool body, having a through hole in the axial direction and having a cutting blade at its tip, and a mist which is connected to the rotary drill via a mist supply passage and is ejected from the cutting blade. Mist generation means for
A dust collecting means that is connected to an air supply source common to this mist generating means through an air supply path and discharges cutting chips by a negative pressure action by air discharge; a mist opening / closing member provided in the mist supply path; A rotary drilling tool, comprising: a dust collecting opening / closing member provided in a supply path, wherein the mist opening / closing member and the dust collecting opening / closing member are opened and closed at substantially the same time.