KR920007961B1 - Mist spouting type drilling device - Google Patents

Abstract

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Description

Spray Drilling Device

1 and 2 are a partial cross-sectional view and a partially cut perspective view showing a first embodiment of the spray type drill apparatus according to the present invention.

3 is a schematic explanatory diagram showing an example of a nebulizer to be applied to the present invention.

4 is a schematic side cross-sectional view showing a second embodiment of the present invention.

5 and 6 are schematic side cross-sectional views and a schematic perspective view of a core drill showing a third embodiment of the present invention.

7 is a side cross-sectional view showing a fourth embodiment of the present invention.

8 is a perspective view showing a drill and a pore nozzle used in the drill apparatus of FIG. 7.

9 is a partial perspective view showing a fifth embodiment of the present invention.

FIG. 10 is a sectional view showing a sixth embodiment of the present invention and showing a specific example of a water supply tank commonly used in the drill apparatus of FIG.

11 is a sectional view showing the seventh embodiment of the present invention, showing a main part of a water supply tank.

The present invention relates to a drill device that can effectively drill hard materials such as concrete and stone, and in particular, sprays that can be drilled efficiently by spraying fog droplets on the drill bit to suppress heat generation during drilling and removing dust. (噴霧) The type relates to a drill device.

When drilling a hard material such as concrete using a drill having a bit containing an ultra hard material such as diamond particles, the drill generates a high heat of about 600-1000 ° C. due to rotational friction with the punched material. The heat generated during the drilling increases the wear rate of the drill bit, shortens the drill life, and also overcomes problems such as sintering of the drilled material and drill breakage. In order to suppress high heat generated at the time of drilling, conventionally, a method of cooling by supplying a cooling medium such as water or air to a drill bit is used.

As one method, many drill apparatuses have been proposed, in which a cooling medium is inserted into an axial flow path using a hollow drill flowing along an axial center, and a cooling medium is ejected from the drill tip to effectively cool the drill bit. .

The water cooling method, in which the cooling medium used to cool the drill bit, is expected to have a high cooling effect, but the water from the tip of the drill bit is dirty and the surrounding material is dirty, making it difficult to clean after work. In order to recover the discharged water, a cover for covering the drill is used to increase the size and complexity of the drill, and also require a water recovery mechanism.

On the other hand, the air-cooling method in which air is ejected from the drill tip using the cooling medium is not sufficient for the cooling effect, and it is not good for the powder generated during drilling to blow in the air. In practice, a dust cover with a drill is used, but the handling is complicated and the workability is bad. As such, the conventional drill apparatus using water or air as a cooling medium has characteristics opposite to each other, and thus a drill apparatus that can be easily handled while complementing their characteristic effects is required.

An object of the present invention is to provide an easy-to-handle drill device that has a good cooling effect and smooth perforation while minimizing contamination of the perforations and surroundings and increasing workability. Drilling apparatus of the present invention for achieving this object is a rotary drill having a cylindrical drill bit formed with a slit passing through the shaft at least at the front end and at least one air flow passage penetrating from the rear end to the slit and opening toward the slit; There is a flow passage communicating with the drill holding portion having the shaft hole to hold the rotary drill and the shaft holding portion of the drill holding portion. It is connected to a circle and a water supply to generate water droplets like mist (hereinafter abbreviated as "fog"), and it is characterized by consisting of a sprayer for emitting mist from the tip of the drill bit through the flow path in the rotary drive body and the water supply path in the drill. When the mist sprayed from the atomizer is introduced into the drill passage of the rotary drill and ejected to the tip of the drill bit, the heat generated by the rotational friction with the drilled material when the drill bit is drilled is effectively suppressed. That is, when the mist going to the drill bit through the sudden aisle touches the heated drill bit, it vaporizes. This vaporization causes the drill bit to cool. In addition, the unvaporized mist moderately wets the powder produced during the puncture to prevent it from flying into the air.

According to the present invention, a sufficient cooling effect due to the fog and the dust is prevented from flying to ensure a good working environment. If the distance from the sprayer to the perforation area is long, fog is likely to be condensed and become water droplets. In order to prevent such dropping, the sprayer should be installed near the entrance of the emergency passage of the rotary drill. In addition, by inserting a nozzle with a small hole inside the hollow drill to reduce the volume of the internal space, the start of the operation of the drill device, the supply of the stop and the fog, and the stop is well mutually responsive.

Other objects and features of the present invention will be described in detail by the accompanying drawings.

1 to 3 show an embodiment in which the spray drilling method according to the present invention is used as an example, and is applied to a drill for drilling small holes in concrete. This adopts a so-called hand drill or a drill drill, and includes a rotary drive 1 including an electric motor (not shown) and the like, and a rotary drill 10 that can be attached to and detached from the rotary drive 1. It consists of). The rotary drill 10 is mounted to the drill holding portion 3 formed at the motor rotating shaft of the rotary drive body 1 or the tip of the rotating shaft 2 connected in a state driven therewith.

In this case, since the drill holding portion 3 and the rotary drill 10 are coupled with screws, the drill holding portion 3 is formed by drilling the shaft hole 4 at the tip of the rotating shaft 2 and fixing the screw therein. The storage chamber 6 is formed in the state where the packing bearing 7 is closely bitten in the axial direction between the inner surface of the front casing 5 of the rotary drive body 1 and the outer peripheral surface of the rotary shaft 2. This storage chamber 6 communicates with the inside of the rotating shaft 2 which is the drill holding | maintenance part 3 via the one or more communication port drilled by the rotating shaft 2. In addition, the front casing 5 is provided with a water supply port 8 communicating with the storage chamber 6. Therefore, the flow path which passes through the storage chamber 6 and into the rotating shaft 2 in this air supply port 8 is formed.

9a in the figure is a bearing for the rotating shaft 2. Since the other structure of the rotating drive body 1 is the same as that of a general electric drill, it does not specifically limit here. The holding mechanism of the drill 10 may also be a means for holding by chuck as well as a screwing engagement as in the illustrated embodiment. In this embodiment, the rotary drill 10 is applied to the drilling of hard materials (m) such as concrete, stone, and shank 11 of the sintered drill bit 12 containing super hard materials such as diamond particles. It is a structure formed at the tip. The drill bit 12 is a circumferential shape having a spherical blade surface at the distal end, and at least the slit 13 passes through the shaft center and is cut at the intersection of the slit 13 and the outer circumferential surface of the drill bit 12. To form. This shank 11 has a steep passage 14 penetrating along the shaft center, and the tip is pierced toward the slit 13.

In the figure, reference numeral 15 denotes a mounting part having a threaded portion 16 for screwing into the drill holding portion 3 of the rotary drive 1, and reference numeral 17 designates a drill 10 to the drill holding portion 3; Hexagonal cross section or non-circular cross section for locking the tool for screwing. When the drill 10 having the above-described configuration is coupled to the drill holding unit 3 with a screw, a flow path leading to the inside of the air supply port 8, the storage chamber 6, and the rotating shaft 2 formed in the rotary drive unit 1 is provided. And the water supply passage 14 formed along the drill axis.

The mist sprayer 20 which produces | generates a mist is connected to the water supply port 8 formed in the front casing 5 of the rotation drive body 1 via the L-shaped connector 21. The fog mentioned here refers to the fine particles of water floating in the air. The sprayer 20 connects the compressed air source P 23 to the air supply port 22a of the spray exposure 22 via the air supply pipe 24, as shown in FIG. The water supply device 25 is connected to the water supply port 22b via the water supply pipe 26. The spray exposure 22 had a structure in which the water supply port 22b was formed in the shrinkage paper part 22c to blow off the mist.

That is, the air introduced from the air supply port 22a flows faster at the portion 22c, and the water is sucked up from the water supply port 22b to form mist-shaped water droplets W. The mist-like water droplets W are mixed with compressed air to form an internal flow path of the rotary drive unit 1 including the L-shaped connector 21 and the storage chamber 6, and the drill bit 12 through the drill feed passage 14 of the drill. Is supplied. The mist-like water droplets W generated in the sprayer 20 should not be completely vaporized or condensed (condensation) into the water droplets in the middle of the supply passage or the water supply passage supplied to the drill bit 12.

This is because fog condensation on the supply passage causes a problem such as water cooling using water as a cooling medium. In order not to completely vaporize the mist (W), the air to be supplied to the sprayer 20 is mixed with water at the most appropriate ratio. Therefore, the flow control valve 27 may be formed in the middle of the air supply pipe 24. The drilling apparatus is operated prior to drilling, and at this time, the flow control valve 27 may be operated to allow good mist to be ejected from the tip of the drill 10. In the case of forcibly supplying water to the sprayer 20, the flow control valve 28 may be formed in the middle of the water supply pipe.

In addition, in order to reduce the possibility of condensation occurring when condensation occurs in the water supply path to the drill bit 12 due to condensation in the water supply path to the drill bit 12, the distance from the sprayer 20 to the drill bit 12 is reduced. Keep it as short as possible. Accordingly, the sprayer 20 is brought as close as possible to the water supply port 8 formed in the portion of the front casing portion 5 of the rotational drive 1. That is, the L type connection part 21 which connects the nebulizer 20 and the water supply tool 8 may be cut or omitted.

When a hard material such as concrete is drilled using the above-described drill device, the drill bit 12 which is connected to the rotating shaft 2 of the rotary drive 1 and rotates rotates and rubs with the hard material m. Generates a high heat of 600 ° C or more, the mist (W) to be supplied via the spray passage 14 made in the sprayer 20 is vaporized when contacted the drill bit 12, the drill bit 12 by the action of the vaporization heat of the fog. Is cooled. In addition, since the powder produced when drilling without vaporization is adequately wetted, it will not be blown into the air even if the powder is discharged from the drilled hole.

In this way, when drilling concrete, fog is supplied to the perforations to suppress performance deterioration caused by heat generation of a very strong drill bit containing diamond particles and the like, while preventing powder from scattering and deteriorating workability. As a result of comparative drilling experiments in which anchor holes are drilled in concrete, it was confirmed that the spraying apparatus of the present invention has the same efficiency as the conventional water-cooling drilling apparatus.

In addition, Table 1 shows the results of concrete drilling experiments using two types of drill apparatuses, the spray method according to the present invention and the conventional air-cooled method. The experiment was carried out by rotating a diamond bit of 9.5 mm in 8000 revolutions.

TABLE 1

As apparent from the results of the experiment, the spraying method according to the present invention has a 50% higher drilling efficiency than the conventional air cooling method. That is, according to the present invention, while achieving a performance equivalent to that of the water cooling method, it is possible to achieve better workability than the air cooling method.

In the above embodiment, the sprayer 20 is housed in the protective cover 20a fixed to the drill rotary drive 1 so as to be easily applied to a conventional drill device, but the rotary drive 1 and You may comprise separately and you may assemble the atomizer 20 in the rotating drive body 1 inside. In other words, any structure may be adopted as long as the fog can be ejected from the drill bit 12 via the sudden aqueduct in the drill.

In the second embodiment shown in FIG. 4, the present invention is applied to a core drill. In other words, the drill has a circular frame with a large shaft and a large diameter, and can drill a large diameter hole in a hard material such as concrete. When the concrete is drilled with this core drill, the drill shaft has a circumferential shape. The concrete mass remains.

The core drill 30 described here includes a round frame-shaped shank 31 having a large diameter, a bit 32 having a shape at the tip of the shank 31, and a drill holding part 3 of the rotary drive unit 1. It consists of a snow-mounted part 35 which has the threaded part 36 screwed into (). An empty portion of the drill shaft core is used as the supply passage 34 for guiding the fog supplied to the drill holding section 3 to the drill tip bit 32.

In addition, as in the third embodiment shown in FIGS. 5 to 6, a linear aerodynamic passageway penetrating in the axial direction inside the wall surface 33 that forms the drill installation portion 35 and the shank 31 ( 34 may be provided in plurality. According to the structure of this embodiment, compared with the use of the hollow center of the shaft center of the core drill 30 as a quick passage, the supply loss is small in the drilled portion by the drill bit 32, and the fog can be supplied. Other components in this embodiment are the same as in the above embodiment. In actual use of the drill apparatus of FIG. 1, the mist is generated as a sprayer at the same time as the operation of the apparatus is started, but the mist is ejected from the drill tip after a little delay from the operation start time.

In addition, after stopping the driving drill device, the mist is stopped for a while. This is due to the fact that the volume of the emergency passage from the sprayer to the drill tip retains the mist, and furthermore, the amount of mist per hour required for spraying drilling is smaller than the internal volume of the general-purpose hollow rotary drill. It became.

7 and 8 show an embodiment in which the small hole nozzle 40 is inserted into the water supply passage 14 of the hollow rotary drill 10 to shorten the time difference from spray start to spraying. Indicates. The small hole nozzle 40 decreases the volume of the water supply passage 14 of the rotary drill 10 and at the same time speeds up the flow of mist supplied to the water supply passage 14. According to this embodiment, the fog could be seen from the drill tip immediately after the operation of the drill apparatus. The small hole nozzle 40 has an outer shape to occupy as much as possible the volume of the water supply passage 14 of the rotary drill 10, and at the same time the volume of the inner flow passage 40 'is the minimum required. do.

In addition, the tip of the small hole nozzle 40 may be thinned so as to be easily inserted into the drill 10. This may also increase the flow of fog passing through the flow path 40 '. In the illustrated embodiment, the small hole nozzle 40 is made smaller than the general hollow drill inner diameter so that the small hole nozzle 40 is drilled using the sleeve 41 made of a soluble material. It can be attached closely to the Therefore, different sized sleeves can be applied to any size drill. Further, the small hole nozzle 40 may be made of metal, and the sleeve 41 may be molded of synthetic resin or the like, and of course, both of them may be integrally molded of synthetic resin.

7 and 8, the configuration of the flow path from the sprayer 20 to the water supply passage 14 inside the drill is different from that of the above embodiment, but there is no difference in the spirit of the invention. Here, the structure which introduce | transduces a mist in the rear end of the rotating shaft 42 which has the drill holding part 43 at the front-end | tip was employ | adopted. The rotating side coupling member 44 is fixed to the rear end of the rotating shaft 42, and the fixed side coupling member 45 connected to the connector 21 connected by the sprayer 20 via the flexible pipe 21a is a spring 47 Force is applied to the rotational side coupling member 44, and the flow path of the fog is kept in a tightly sealed state by the action of the O-shaped ring packing 46 between the coupling members 44 and 45.

In the figure, 48 is a power shaft connected to the motor rotation shaft, and 49a and 49b are gears for transmitting rotational movement from the power shaft 4 8 to the rotation shaft 42. 42a and 42b are bearings of the rotating shaft 42 and the power shaft 48, respectively. Other components having the same reference numerals as the above embodiments are equivalent to the same components, and thus redundant descriptions are omitted. In the illustrated embodiment, the small hole nozzle 50 is also attached to the inner flow passage 42 'of the rotating shaft 42. This small hole nozzle 50 has the same configuration as the small hole nozzle 40, and is tightly stored in the rotation shaft flow path 42 'by the sleeve 51. As shown in FIG. If the inner diameter of the rotating shaft flow path 42 'is sufficiently small, it is not necessary to form the small hole nozzle 50. Using a drill device equipped with a small hole nozzle (40, 50) in the water supply passage, and equipped with a sprayer capable of emitting a mist of 0.05CC per second, a hole having a diameter of 9.5-14.5mm was drilled. Within just 0.5 seconds of operation of the (20), mist erupted from the drill tip. As described above, in the drill apparatus without the small hole nozzle, it took 5 to 20 seconds from the start of spraying to the ejection.

Using the small-bore nozzle as described above, it was experimentally confirmed that the workability was improved by spraying the mist from the drill tip with good responsiveness immediately after the operation of the emergency aisle. The illustrated embodiment has been applied to a drill without a core, but can of course also be applied to core reels.

9 is an embodiment of a drill device in which the water supply tank 60 together with the sprayer 20 is mounted on the rotary drive unit 1. The sprayer 20 and the water supply tank 60 are supplied with compressed air via a cap tire hose 61 and air supply pipes 6 2, 63, and the compressed air is supplied to the sprayer 20 by spraying the sprayer 20. ) Pressure to feed water. Water replenishment of the water supply tank 60 can be performed arbitrarily in the water supply port 60a. In this way, by providing the water supply tank 60 and the sprayer 20 integrally with the drill device, the handleability is improved. The structure of the nebulizer 20 in this embodiment is the same as that of the said embodiment, but the control valve 64 which adjusts the amount of aerosol is formed in the discharge flow path of the nebulizer 20. By operating this control valve 64, it is possible to manually stop and adjust the fog supply.

Further, the drill apparatus here includes a dust discharge fan 67 mounted on the dustproof cover 65 and the rotary shaft 66 so as to cover the front casing 5 and the drill holding portion 3 of the rotary drive body 1. Equipped with. These dustproof mechanisms can effectively remove dust generated during drilling. Since other components are the same as those of the above-described embodiment or the conventional drill apparatus, detailed descriptions are omitted.

Next, FIG. 10 shows a sixth embodiment as a specific example of the water supply tank 60. As shown in FIG. The water supply tank 60 is provided with a sliding contact between the cylindrical tank main body 68 and the blocking plates 69 and 70 for closing the openings before and after the tank main body 68 and the tank main body 68. It is schematically comprised by the fuselage 71. O-shaped rings 72 and 73 are fitted to each of the blocking plates 69 and 70 so that the airtightness or watertightness of the tank body 68 can be maintained. The sliding body 71 has two O-shaped rings 74, and is formed to slide while maintaining airtightness to the tank body 68 by the air pressure flowing into the tank body 68 from the air supply pipe 63. have.

The air supply pipe 63 is composed of, for example, a short pipe 75 connected to the cap tire hose 61, a pull lug 76 screwed to the blocking plate 70, and a coupler 77 connecting them. do. One air supply pipe 62 is formed as one pipe which connects between the nebulizer 20 and the cap tire hose 61. In addition, the water supply tank 60 and the sprayer 20 are connected by a coupler 78 screwed to the blocking plate 69 and a discharge pipe 80 formed of a short pipe 79.

The compressed air coming from the compressed air source 23 branches at the ends of the captire hose 61 with air of equal pressure to the air supply pipes 62 and 63. When the compressed air enters the tank body 68 via the air supply pipe 63, the sliding body 71 moves in the direction of the arrow L at the pressure. By the movement of this sliding body 71, the water W stored in the tank is forcibly sent to the atomizer 20 via the discharge pipe 80. As shown in FIG. In addition, a filling hole 81 for filling water W is formed in the blocking plate 69 forming the front end of the water supply tank 69, and the filling hole 81 is blocked by a cap 82. The water in the tank disappeared Fill the water in the filling port (81). At this time, the sliding body 71 is pushed in the opposite direction to the arrow (L) direction by the charging pressure.

The water supply tank 60 is connected to the coupler 77 and 78, and the water supply tank 60 is installed so that the water supply tank 60 can be detachably attached to the rotary drive 1 by a simple fixing means such as a band. Can be made into a cartridge type. In addition, with the structure of the sliding body 71, even if the water supply tank 60 is inclined due to the use state of the rotary drive unit 1, the water (W) maintains a good pouring state, so that the simplicity or usability of the drill device Is improved.

In this way, by pressurizing the water in the water supply tank 60 and forcibly sending it to the sprayer 20, the air in the air supply pipe 62 is increased due to the increase in the centrifugal force under high-speed rotation of the rotary drill 10 or the aeration resistance during drilling. Even if the flow rate is reduced, the sprayer 20 can produce fog. In the sixth embodiment, a simple type in which the water supply tank 60 is integrally fixed to the rotary drive unit 1 is illustrated. For example, the water supply tank 60 is separately installed to continue the drilling operation. It can also be set as the structure which enlarges a volume. This example is shown in FIG. 11 as a seventh embodiment.

The water supply tank 83 is composed of a drum-shaped tank main body 84 having an upper surface perforated and a blocking plate 85 for blocking an opening in the upper surface of the tank main body 84. The blocking plate 85 is fitted with an O-shaped ring 86 for maintaining airtightness. In addition, a substantially L-shaped plug 88 having an air supply hole 87 is installed in the blocking plate 85, and couplers 89 and 90 are installed. The coupler 89 is connected to a discharge pipe 91 for sending water from the water supply tank 83 to the sprayer 20, and is connected to an upper end of the water supply pipe 92 provided in a suspended state in the tank.

On the other hand, the air supply pipe 93 for sending compressed air to the sprayer 20 is connected to the coupler 90, and a communication tube 94 is provided between the coupler 90 and the plug 88. The diameter of the communicating tube 94 is fitted close to the coupler 90 and is set to a size corresponding to a part of the plug 88. As a result, the compressed air passing through the plug 88 branches into the water supply tank 83 and the air supply pipe 93. The water (W) is pressurized by the compressed air flowing into the tank and sent to the sprayer (20) via a water supply (92). Moreover, the air of the same pressure as the air which flows in into a tank is sent to the atomizer 20 via the communication pipe 94. As shown in FIG.

In addition, in this embodiment, the communication tube 94 may be removed, but when the water W is full or similar, the water W may be caused by shaking of the liquid surface due to vibration of the tank. 93 is confirmed by actually using the suction, and can be prevented by installing a communication tube 94.

As described above, according to the present invention, when drilling a hard material such as concrete to cool the drill bit by releasing mist from the drill tip, the drill bit for rotating drilling is effectively cooled without generating high heat, so it is a disadvantage of the water cooling method. It is possible to expect the same drilling performance as the water cooling method while eliminating the need for more effective drilling while minimizing the wear of the drill. Moreover, by spraying the mist from the drill tip, it is possible to work effectively without blowing the dust generated during drilling into the air, which makes the handling easier and the drilling workability is greatly improved, and the dust treatment after the work is simplified. . In addition, since the sprayer can be applied only to the drill apparatus using the hollow drill, the performance is very high.

Claims (11)

A rotary drill having a circumferential drill bit having a slit passing through the shaft at least at the leading end, and having at least one sluice path passing through the leading end from the rear end to the slit; There is a drill holding part with shaft hole, and a flow path communicating with the drill holding part shaft hole, and it is connected in communication with the rotating driving body to hold and rotate the rotating drill in the drill holding part and the flow path of the drill holding part. At the same time, it is connected to the compressed air source and the water supply to generate water droplets, such as mist, spray atomizer drill device for spraying mist-like water droplets to the drill bit tip through the flow path in the rotary drive and the drill path in the drill. 2. The spray according to claim 1, wherein the drill has a hollow core and a large diameter rounded core drill, wherein the empty portion of the shaft is an emergency passage for supplying mist from the sprayer to the drill bit portion. Anti-corrosion drill. The core drill as set forth in claim 1, wherein the drill is a core drill having an axially hollow and large diameter rounded wall, which forms a plurality of linear emergency passages axially penetrating into the inner wall. Spray-type drill device to supply the return mist to the drill bit part through this steep passage. The spray type drill apparatus according to claim 1, wherein at least one communication hole is drilled on a side surface of the drill holding portion of the rotary shaft to communicate the atomizer with the inside of the rotary shaft. The spray type drill apparatus according to claim 1, wherein the spray type drill apparatus is in communication with the spray gun at the rear end opening of the rotary shaft. The spray type drill apparatus according to claim 1, wherein a nozzle having a small hole is inserted into an emergency passage of a rotary drill. The spray type drill apparatus according to claim 1, wherein a nozzle having a small hole is inserted into an internal flow path of the rotating shaft. The sprayer of claim 1, wherein a compressed air supply source is connected to the air supply port of the spray nozzle through the air supply pipe, and a water supply port is formed in the shrinkage diameter portion of the spray nozzle, and the water supply port is connected to the water supply port via the water supply pipe. Spray-type drill device constructed by connection. The spray type drill apparatus according to claim 1, wherein a water supply tank is mounted on the rotary driver, and the sprayer receives water from the water supply tank. The spray method of claim 1, wherein the spray amount control valve is formed in the sprayer. The spray type drill apparatus according to claim 1, further comprising a dust cover covering the drill holding portion and a fan for dust discharge on a rotating shaft.

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