JPS63200905A - Drilling device - Google Patents

Abstract

PURPOSE:To prevent noise, make chips collected and stabilize rotation of a drill at the time of boring in stone or the like by sending pressure air through a shaft to be exhausted from the forward end of the drill and sucking to be discharged from a vent hole provided in a joint part of a cover enclosing the whole length of the drill. CONSTITUTION:A drill holding part 15 is engaged in a joint member 22, so the main body 1 of a drilling device is joined with a cover member 20. When boring, a cutting blade 17 is inserted into a work, and an attachment member 23 and the front end of a cover 21 are attached to the surface of the work so as to close the inner space of the cover 21. Pressure fluid is sent from a duct P1 through a fluid supply tube 11 and a fluid storage chamber 8 into passages 7, 16 penetrating through a rotary shaft 5 and a drill 14, and air in the cover 21 is discharged from a vent hole 28 by means of a pump or the like connected with a connecting tube P2. Air flowing from the forward end of the drill 14 goes outside the drill 14 reversely along the shaft to get into the vent hole 28, so chips and dust produced from the work for boring are carried out by air current.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drilling device for forming holes in hard materials such as concrete and stone. The present invention relates to a drill device that can effectively reduce dust, collect dust, etc., and also provide stable drill rotation.

[Prior Art] When forming holes in various hard materials such as concrete and stone, in addition to drilling equipment that uses a hammer blow using a high-pressure air flow, drilling equipment that utilizes the rotary drilling and drilling action of a drill is used. .

The former device makes a lot of noise and vibration when hammered, and has been criticized as a pollution hazard.

On the other hand, the latter drill device usually uses a rotary driver such as an electric motor inside the main body to perform twist drills,
It is configured to rotate a drill having a grinding blade formed of an abrasive material. When drilling hard materials with such drilling equipment, noise and vibration can be suppressed compared to the former type of impact drilling equipment, but the generation and dissipation of dust is still small but still unsolved.

Various attempts have been made to reduce noise and dust pollution generated during drilling operations. For example, a dust cover has been installed that surrounds the drill protruding from the drill equipment body like a skirt. There is. This dustproof cover is made of flexible synthetic resin or elastic material such as rubber and is formed into a cylindrical bellows shape. The space is kept closed and the bellows of the dust cover expands and contracts as the drill digs. This reduces noise generated during drilling and prevents dust from dissipating.

Furthermore, if the shavings or chips generated during drilling are not smoothly removed from the hole being drilled, it may cause clogging or displacement or wobbling of the tip of the drill. In order to avoid these inconveniences, the drill proposed by the present inventor in Japanese Patent Application Laid-open No. 146412/1983 is effective. That is, a fluid flow path is formed along the axis of the drill, and lubricating fluid or high-pressure air is discharged from the tip of the drill through this flow path. As a result, the above-mentioned dust can be effectively discharged from the machined hole, and a lubricating effect and a cooling effect can be provided to the cutting edge portion at the tip of the drill, so that efficient drilling work can be expected.

Furthermore, the present inventor has proposed, in Japanese Utility Model Application Laid-open No. 168904/1983, a drilling device employing a hollow drill having the above-mentioned structure, which is provided with the above-mentioned lubricant recovery mechanism. This proposed drill device applies suction force via a suction tube to an annular liquid collection member that surrounds the processing area where the cutting edge at the tip of the drill is located. Therefore, the lubricating fluid that is supplied to the flow path formed along the axis of the drill during machining work and discharged from the tip of the drill can be collected together with chips in the liquid collection section.

[Problems to be solved by the invention] Although the above-mentioned drill device equipped with the dustproof cover can simply reduce the noise generated during operation, it does not have the function of eliminating the chips and dust that are generated at the same time. ,
Therefore, chips may not be removed from the hole being drilled, or dust may scatter from the gap between the dust cover and the object to be drilled.

Further, there are inconveniences such as the need to frequently interrupt work to remove dust.

Clogging of holes due to chips during drilling is described in JP-A-61-1 mentioned above.
The problem can be solved by using the drill according to No. 46412, and furthermore,
It is conceivable that the dissipation of chips and dust generated during drilling can be prevented by applying the liquid recovery member of Utility Model Application No. 61-168904 mentioned above. However, chips and dust generated during drilling are scattered from the drilling location and spread throughout the space, even if the space is narrow and closed inside the dustproof cover. Therefore.

Even if a suction member is provided near the perforation point like the liquid collection member described above, the fluid flows through the shortest path from the outlet of the tip of the drill to the inlet of the suction pipe, so the fluid is dissipated from the flow path and dust cannot be collected.

Furthermore, none of the conventional drills and drill devices described above has the ability to stably rotate the drill during drilling.

Therefore, it is an object of the present invention to effectively reduce the noise generated when drilling hard materials such as concrete and stone, and to effectively collect chips and dust, and to ensure stable rotation of the drill by suppressing vibration. The object of the present invention is to provide a drilling device that is driven and is easy to handle.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a rotary shaft driver, etc., which is equipped with a rotary shaft and is built into a drill device main body; a drill removably connected to the rotating shaft; and an extendable cover connected to the main body of the device so as to surround the entire length of the drill in a normal state and provided with an air vent at or near the connected portion; The present invention is characterized in that the air in the space surrounding the cover can be evacuated from an air vent provided in the cover during drilling work.

[Operation J] When pressurized air is introduced into the flow path of the shaft center and exhausted from the tip of the drill, chips and dust generated during drilling are discharged out of the hole. Since the cover that surrounds the entire length of the drill has its tip opening in contact with the object to be drilled, the internal surrounding space is closed. Therefore, dust generated during drilling is not dissipated to the outside, and noise caused by drilling is also blocked.

Furthermore, during drilling work, by forcibly suctioning and discharging the air in the space closed by the cover from the air vent provided at the connection part, the air exhausted at the tip of the drill flows into the air vent along the drill. do. In this way, the air flowing from one end of the internal surrounding space of the cover to the other end prevents dust generated during perforation from adhering to the inner surface of the cover, thereby eliminating the accumulation of dust. Moreover, since the airflow flows along the axis of the drill,
Uniform fluid pressure is applied to the entire circumferential surface of the drill, and the drill, which makes one rotation, is stabilized by the support of pressure fluid from the sides.
Shaking is suppressed.

[Example] An example of the present invention will be described below based on the drawings. 1st
2 is a partially cutaway side view of a drilling device according to the present invention, and FIG. 2 is a partially cutaway perspective view of the front half of the device including a cover.

In the figure, 1 is the main body of the drill device. This device main body l has a rotational drive unit 3 such as an electric motor inside the casing 2, and the vicinity of both ends of a rotating shaft 5 that holds a rotor 4 of a zero-rotation drive unit 3 is fixed to the casing 2. bearings 6a, 6b
It is rotatably supported on a shaft.

The rotary shaft 5 has a flow path 7 passing through it along its axis.A rear end 5a of the rotary shaft 5 protrudes into a fluid reservoir 8 provided in the casing 2. The peripheral surface of 5a is closed with a sealing material 9. The fluid reservoir chamber 8 is located in the device main body 1
It is connected to a fluid introduction member 12 provided at the lower end of the handle 10 via a fluid supply pipe 11 arranged inside the handle 10 that hangs down from the rear of the handle 10. Therefore, by connecting the conduit P1 from a pressure fluid generating device (not shown) such as a compressor to the fluid introduction member 12, pressure fluid is introduced from the fluid supply pipe 11 through the fluid reservoir chamber 8 into the flow path 7 of the rotating shaft 5. can be sent.

13 is a switch provided on the handle 10.

By operating this switch 13, the rotation drive unit 3 can be rotationally driven. If the 0 rotation section vJ performance 3 is an electric motor, the switch 13 is an electric switch,
If it is driven by high-pressure gas, it is a fluid switch and has a switch mechanism depending on the driving source.

14 is a drill held by a drill holding part 15 such as a chuck provided at the front part of the drill body l. The drill 14 here has a passage 16 passing through it along its axis. The tip of the drill 14 is provided with a cutting blade 17 formed into a cylindrical shape by sintering ultra-hard abrasive grains containing diamond or the like.

The front surface of this cutting edge 17 is recessed into a spherical shape to enhance the drilling effect.

Reference numeral 20 denotes a cover member for housing the liquid in the drill holding portion 15. This cover member 20 is made of flexible synthetic resin, or
A cover 21 is configured to be expandable and contractible by forming an elastic material such as rubber into a bellows shape, and a substantially cylindrical connecting member 22 is attached to one end of the cover to connect the cover 21 to the drill holding part 15. , an annular abutting member 23 provided on the outer periphery of the other end of the cover 21 , and a support member 24 , 24 having one end connected to the abutting member 23 and the other end protruding from both sides of the connecting member 22 . and a guide rod 25.25 which is slidably supported in the axial direction. By providing a coil spring 26 between the abutment member 23 and the support member 24 around each guide rod 25, the abutment member 23 is normally connected to the support member 24.
It is biased in the direction away from the In other words, the contact member 2
The tip of the cover 21, which is elastically connected to the cover 3, is always pushed forward, and the cover 21 is in an extended state.

Reference numeral 27 denotes a finger rest hanging vertically from the abutment member 23. When you hook your finger on this finger hook z7 and pull it backward, the guide rod 2
While the coil spring 26 tied around the coil spring 26 is compressed, the guide rods 25, 25 on both sides are moved backward, and these guide rods 2
5.25, the cover 21 expands and contracts. Of course, if the front end of the cover 21 or the abutting member 23 is brought into contact with a suitable object and the drill device main body l is pressed toward the object.

Similarly to the above, the cover 21 expands and contracts together with the abutting member 23.

The connecting member 22 located between the cover 21 and the drill holding part 15 has an air vent 28 penetrating through a part of the peripheral wall, and this air vent 28 has a connector 29 protruding from the connecting member 22.
It opens to the internal flow path 29'. The connector 29 is for connecting to a connecting pipe P2 from a suction device W1 (not shown) such as a vacuum or a suction pump. 30 is formed. Therefore, when the suction force from the pump is appropriately applied via the connecting pipe P2 and the connector 29, the air inside the cover 21 flows out from the air vent 28. At this time, as shown in the figure, the internal flow path 2 of the connector 29
If an orifice is formed by narrowing 9' in the vicinity of the air vent 28, the suction flow rate becomes faster.

The connecting member 22 also has a holding portion 32 that clamps and holds a limiting rod 31 for limiting the depth of the hole during drilling.

The holding portion 32 is configured such that a pair of holding pieces 32a and 32b projecting like a membrane from the outer peripheral surface of the connecting member 22 can be pinched with a thumb screw 33. As a result, the holding mold 32a,
The rod-shaped restriction rod 31 held between the thumbscrews 33 and 32b
You can freely move or fix it in the length direction by operating . Therefore, limit rod 31 and drill 1
The drilling depth determined between the two optical ends of No. 4 can be set arbitrarily.

Next, the operation of the above embodiment will be explained.

When drilling a concrete object, the drill holding part 15 is made to be a liquid chamber in the connecting member 22, so that the drill device main body 1 and the cover member 20 are joined together as shown in FIG. Therefore, while gripping the handle 10 with one hand and gripping the grip portion 30 of the connector 29 with the other hand, the cutting blade 17 of the drill 14 and the front end of the cover 21 are brought into contact with the object to be drilled. At this time, in order to confirm whether the cutting blade 17 is hitting the drilling position of the object to be drilled, the finger hook 27 is used to move back the abutment member 23 and the cover 21 is expanded and contracted. Visually check the position.

During the drilling operation, the cutting blade 17 penetrates into the object to be drilled, and the contact member 23 and the front surface of the cover 21 come into contact with the surface of the object S to be drilled, and the internal space of the cover 21 is brought into a closed state (third figure).

Therefore, a compressor or the like connected to the conduit Pi is driven, and the fluid supply pipe 11. The rotating shaft 5 via the fluid reservoir chamber 8,
Pressure fluid is introduced into the flow path 7.degree. 16 passing through the drill 14, and at the same time, a pump or the like connected to the connecting pipe P2 is driven to exhaust the air inside the cover 21 from the air vent 28. As a result, the air flowing out from the tip of the drill 14 flows against the outside of the drill 14 in the axial direction, as indicated by the arrow in the figure, and flows into the air vent 28. In this fluid supply state, the switch 13 is operated to rotate the rotary driver 3, and the drill 14 is rotated, thereby drilling a hole in the object S to be drilled. During this drilling process, chips and dust are generated from the object S to be drilled, but the airflow flowing out from the tip of the drill and flowing into the air vent 28 carries out the chips. This effectively eliminates chips inside the hole being machined. At this time, by slightly increasing the suction force of the fluid discharged from the air vent 28 with respect to the pressure fluid supplied to the flow path 16 inside the drill 14, the surface of the drilling target S and the cover in contact therewith are increased. Since outside air flows into the inside of the cover 21 through the gap between the cover 21 and the front edge of the cover 21, it is possible to prevent chips from escaping to the outside through the gap.

In addition, the air discharged from the tip of the drill suppresses the heat generation of the cutting blade during drilling, and the airflow reaching the air vent 28 is controlled by the drill 1.
Since it acts as a lateral pressure on the circumferential surface of 4 and becomes a shaft supporting force, it suppresses slight vibrations and shakes of the drill.

As the drilling process progresses as described above, the state shown in the lower half of FIG. 3 shifts to the drilling state shown in the same half. In this process, the drill bit 4 penetrates into the object S to be drilled, but the front end of the cover 21 and the front surface of the abutting member 23 are prevented from moving forward by the object S, so that the guide rod 25 is repelled by the spring 26. It retreats, and at the same time, the bellows-shaped cover 21 expands and contracts.

The forward drilling of the drill 14 during drilling is stopped when the tip of the limiting rod 31 held by the holding part 32 comes into contact with the surface of the object S. In this way, a hole with a desired depth can be bored in the object S.

As is clear from the above, in order to allow the air discharged from the tip of the drill 14 to flow along the axis of the drill 14, the air vent 28 is provided at or near the connection between the cover 21 and the drill device main body l. It is not necessary to provide the vent hole 28 in the connecting member 22. In other words, it is not necessary to provide the vent hole 28 directly on the cover 21, or it may be provided on the drill main body 1. Of course, in such a case , connector 29
Furthermore, although the case where compressed air is introduced from the channels 7 and 16 has been described, if it is configured so that it can be sucked from the air vent hole 28 of the cover 21, substantially the same effect can be achieved even without introducing compressed air. can be achieved.

Furthermore, although the rotary driver 3 has been illustrated and described as having a rotary shaft 5 having a passage 7 passing through it along its axis,
Even if the structure is such that compressed air can flow from, for example, the drill holder 15 only into the flow path 16 passing through the axis of the drill 14, implementation is not hindered.

[Effects of the Invention] As described above, according to the present invention, pressurized air is introduced into the flow path of the drill and ejected from the tip of the drill, and the air flows through the flow path defined by the cover surrounding the drill to the cover and the drill device main body. The air flow was made to flow into the air vent provided near the connection with the

Chips and dust from drilling by the cutting blade at the tip of the drill are effectively removed without remaining inside the drilled hole and the cover, and the lateral pressure on the drill due to the air flow stabilizes the rotational movement of the drill. In addition, since the cover is made of an elastic material that can be expanded and contracted, it is easy to confirm the drilling position at the start of work, and during drilling work, it expands and contracts as the drill penetrates, so it is possible to reach the desired location without impairing work efficiency. Completely implements AI methods for dust removal and noise prevention. Further, since the connector of the air vent opening at the connecting portion of the cover that connects the cover and the drill device main body functions as a handle, handling becomes easy. Further, since the depth of drilling by the drill can be set by the limit rod provided on the holding part on the connecting part, a hole of the desired depth can be obtained even if the drill is hidden behind the cover.

[Brief explanation of the drawing]

The drawing shows an embodiment of the drilling device according to the invention, and shows a first embodiment of the drilling device according to the invention.
The figure is a partially cutaway side view, Figure 2 is a partially cutaway perspective view of the cover member, and Figure 3 is a side cross-sectional view showing two states in use, the lower half is the drilling start state, and the upper half is the drilling state. This is the state at the end. ■0. Drill device main body, 390 rotation driver, 510 rotation axis, 7. , flow path, 140. Drill. 160. Channel, 210. cover, 281. Air vent.

Claims (1)

[Claims] A rotary shaft motor equipped with a rotary shaft and built into a drill device main body; A drill having a flow path passing through the shaft center and detachably connected to the rotary shaft; Normally surrounding the entire length of the drill. a retractable cover connected to the device main body and provided with an air vent at or near the connection part; A drilling device characterized by being able to release air.