JP3826383B2 - Rotary drilling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a rotary drill apparatus for performing a drilling operation on a wall surface of a building or the like while supplying cooling water or an appropriate cooling medium into the drilling.In placeRelated.
[0002]
[Prior art]
  For example, in a concrete building, when repairing cracks and tiles that have occurred on the wall surface or ceiling, or peeling of the exterior wall, etc., repair holes are drilled in the generated locations. Fill the inside with an adhesive or drive an anchor pin. The repair hole is generally drilled at a predetermined location such as a wall surface using a vibration drill device or a rotary drill device. The vibration drill apparatus has a feature that a drilling operation can be easily performed by making cooling water or the like unnecessary. The vibration drill apparatus has a large noise due to the vibration of the drill during drilling work, and has a problem in use in repair work such as an apartment, a hotel, and a hospital. The vibration drill device causes a problem that the crack to be repaired is meaninglessly spread when the drilling position, the hole diameter, or the like is used in an incorrect state.
[0003]
  For this reason, recently, in the repair work described above, a rotary drill apparatus having a diamond bit attached to the tip is generally used. In order to improve work efficiency or reduce noise, this rotary drill device generally supplies cooling water from the tip of a drill bit.In the drillingDrilling is performed while feeding. In order to efficiently cool the drill bit and remove dust generated from the drilled hole, the rotary drill device uses compressed air to spray cooling water in the form of a mist.
[0004]
[Problems to be solved by the invention]
  In the conventional rotary drill device, a switching lever is provided in the drill body, and the coolant is supplied / stopped from the coolant supply unit by switching the switching lever. Rotary drilling equipmentInIn general, drilling is performed by positioning the drill bit at a drilling position in a state where the drill bit is rotationally driven and the switching lever is operated to eject the coolant from the tip thereof. Conventional rotary drilling deviceInFor this reason, during the actual drilling operation from the switching operation of the switching lever and during the switching operation of the switching lever after finishing the drilling operation, the coolant flows out from the tip of the drill bit. For this reason, the conventional rotary drill device has a problem that the coolant is wasted and the surroundings are soiled.
[0005]
  In the rotary drilling device, the coolant is always supplied from the drill bit into the drilling during the drilling operation, and the supply is stopped as soon as the drilling operation is finished.NiIdeally. Rotary drilling equipmentInIsFor thisFor example, it is considered that the valve mechanism is configured to control the opening / closing operation by detecting the rotation operation of the rotating shaft. However, such a rotary drill device is not practical because, for example, a coolant flows out when a drill bit rotation test or the like is performed.
[0006]
  The present invention solves the problems of the conventional rotary drill apparatus described above, and has a simple structure.FruitCooling medium only when drillingTheAutomatically feeds into the drillingTo improve the efficiency and usability of the cooling mediumRotating drill equipmentPlaceThe purpose is to provide.
[0007]
[Means for Solving the Problems]
  The rotary drill apparatus according to the present invention that achieves the above-described object is as follows.A cooling medium supply unit;A rotating shaft, a coupling member, a connection nozzle member, a valve member, an elastic member, and a drill head are provided.In the rotary drill device, the cooling medium supply unit is composed of a portable holder and an aerosol can that is contained in the holder and encloses a cooling medium mixed with a low boiling point organic solvent using a liquid as a base material. IsThe The rotary drill device is a rotary shaft that is driven to rotate by a drive motor.ofInside,It consists of a hole with a bottom that opens to the tip side.From the cooling medium supply unitA first cooling medium flow path to which the cooling medium is supplied is formed. In the rotary drill device, the coupling member is integrally combined with the tip of the rotating shaft, and a cooling medium supply port communicating with the opening of the first cooling medium flow path is provided. In the rotary drill device, the connecting nozzle member is fixed to the inside of the coupling member with respect to the rotation direction, and is movably combined in the axial direction.MosquitoA second cooling medium flow path communicating with the opening of the first cooling medium flow path formed in the rotating shaft through the cooling medium supply port of the pulling member is formed over the entire length in the axial direction. In the rotary drill device, the valve member is provided in the first cooling medium flow path of the rotation shaft so as to be movable in the axial direction, and opens and closes the opening of the first cooling medium flow path. In the rotary drill device, the elastic member urges the valve member toward the second cooling medium flow path to close the opening of the first cooling medium flow path, whereby the first cooling with respect to the valve member is performed. A clogging behavior is imparted between the medium flow path and the second cooling medium flow path. In the rotary drilling device, the drill head has a cooling medium flow path formed in the interior thereof, which is in communication with the second cooling medium flow path, and is attached to and detached from the tip of the connecting nozzle member.The cooling medium supplied from the cooling medium supply unitA drill bit attached to the tip is fed into the bore.
[0008]
  According to the rotary drill apparatus according to the present invention configured as described above, the valve member is connected via the connecting nozzle member in accordance with the drilling operation.Pressed against the drilling pointThe pressing force from the drill head is applied to move the first coolant flow path in the direction of opening the opening against the elastic force of the elastic member. According to the rotary drill deviceBy the movement of this valve member,The first cooling medium flow path in the rotating shaft, the second cooling medium flow path in the connection nozzle member, and the cooling medium flow path in the drill head communicate with each other.Supplied from the cooling medium supply unitCooling medium is drill bitThe drilling operation is performed in a state where the jet is supplied from the tip of the nozzle into the drilling..
[0009]
  Rotating drill equipmentIn placeAccording toWhen the predetermined drilling operation is completed and the drill head is pulled out from the drilling hole, the pressing force from the drill head is released, and the elastic force of the elastic member causes the valve member to return to the initial position so that the first cooling medium By closing the opening of the flow path, the space between the first cooling medium flow path and the second cooling medium flow path is closed. Therefore, according to the rotary drill apparatus, the cooling medium is supplied into the drilling hole only when the drill head is pushed in and the drilling operation is actually performed by the drill bit. According to the rotary drill device, the cooling medium is used at the minimum necessary,The effective use of the cooling medium is prevented, and the occurrence of a situation in which an unnecessary cooling medium scatters and stains the surroundings is prevented. Rotating drill equipmentIn placeAccording to this, the opening / closing operation of the valve mechanism is unnecessary, and the operability is improved. Rotating drill equipmentIn placeAccording to this, it is configured by a simple structure composed of a valve member and an elastic member incorporated in the rotating shaft.,smallMold weight reductionIs plannedAnd make it cheaperButPossibleNaThe
[0010]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The rotary drill apparatus 1 shown in FIG. 1 as a first embodiment of the rotary drill apparatus according to the present invention is used to prevent cracks and tiles that have occurred on the walls and ceiling of a concrete building, or to lift the exterior wall. In the repairing operation, it is preferably used when a repair hole for repairing for filling an adhesive agent or driving an anchor pin into these places is drilled. The rotary drill device 1 includes a drill main body 2, a drill unit 3, and a cooling medium supply unit 4. The drill main body 2 is configured in the same manner as a commercially available rotary drill device, and details thereof are omitted. However, a hand motor 2b is provided on one side of the drill body 2 and a drive motor or a rotation is provided inside a housing 2a in which a power switch 2c is disposed. A shaft and a well-known drill chuck mechanism provided on the rotating shaft are incorporated.
[0011]
  The drill portion 3 is composed of a cylindrical housing 5, a rotary shaft 6, a drill head 7, a rotation stop member 8, a built-in valve mechanism switching lever 9 (not shown), and the like, and the other side of the drill body portion 2. Removably attached to. The cylindrical housing 5 is provided with a bearing mechanism (not shown) in the interior thereof, and supports the rotary shaft 6 and the drill head 7 so as to be positioned coaxially with each other and rotate integrally. In addition, the cylindrical housing 5 includes a liquid-tight space that receives a cooling medium supplied from a cooling medium supply unit 4 described later.
[0012]
  The rotary shaft 6 protrudes from one side of the cylindrical housing 5 and is chucked by the drill chuck mechanism of the drill body 2 and is driven to rotate by a drive motor. The drill head 7 includes a drill bit support portion 7a and a drill bit 7b. Although not shown, the drill bit support portion 7a has an elongated cylindrical shape in which a cooling medium flow path communicating with the space portion of the cylindrical housing 5 is formed over the entire length in the axial direction. The drill bit support portion 7 a is driven to rotate by the rotating shaft 6 being chucked by the drill chuck mechanism of the drill body portion 2.Through this rotating shaft 6While being driven to rotate, a drill bit 7b is mounted at the tip. The drill bit 7b has an injection port that communicates with the cooling medium flow path at the tip thereof, and is formed of, for example, diamond, and the wall surface, etc.Repair holeThe blade edge part for perforating is formed.
[0013]
  The locking member 8 isIt is a substantially crank-shaped member, from the cylindrical housing 5 of the drill part 3Protrusively provided. When the drilling operation described later is performed by the rotary drill device 1, the rotation-stopping member 8 holds the hand-held portion 2 b of the drill body 2 with one hand and is held by the other hand, thereby In contrast, the drill head 7 is held in a stable state.
[0014]
  The cooling medium supply unit 4 includes two aerosol cans 10 </ b> A and 10 </ b> B (hereinafter collectively referred to as aerosol cans 10) enclosing the cooling medium, a holder casing 11 that houses these aerosol cans 10, and the aerosol can 10. And cylindrical housing 5 of drill part 2Configured inThe hose 12 etc. which connect a liquid-tight space part are comprised. When the aerosol can 10 is loaded into the holder casing 11, the cooling medium supply unit 4 is in a state in which the stem of the aerosol can 10 is pushed in and the enclosed cooling medium can be supplied. When the switching lever 9 is operated to open the valve mechanism, the cooling medium is supplied from the aerosol can 10 to the drill unit 3, and from the injection port of the drill bit 7 b via the cooling medium flow path in the drill head 7. It is injected into the repair hole. The cooling medium removes chips from the inside of the repair hole and cools the drill head 7.
[0015]
  Although not shown, the holder casing 11 is provided with a harness or the like and can be attached to the operator's waist or the like. The cooling medium supply unit 4 has a weight of about 900 g per aerosol can 10 and can be sufficiently carried even if the weight of the holder casing 11 is included, which may hinder the drilling of the repair hole. No. In addition, the cooling medium supply unit 4 is easy to handle because the amount of the hose 12 is reduced.
[0016]
  The aerosol can 10 has a legal regulation in which the inner volume of the filling body is 1000 ml or less and the filling rate is 90% or less in the initial storage state, and generally 800 ml or more in consideration of the safety factor. 850 milliliters of filling is filled. In the aerosol can 10, a cooling medium in which a low-boiling organic solvent is mixed with a liquid as a base material is filled as a filling with an injection pressure described later. As the base material, for example, use of volatile alcohol, acetone, or the like is considered, but it is preferable to use water that is inexpensive, safe, and easy to handle.
[0017]
  In the case of an aerosol can filled with only cooling water as a cooling medium in a state where only the cooling water is pressurized, the inside of the repair hole for drilling the cooling water with a sufficient injection pressure from the injection port of the drill bit 7b. It is difficult to inject. In addition, the aerosol can filled with only the cooling water requires the drill head 7 having a nozzle diameter of about 2.0 mm, and thus cannot be used when drilling a repair hole having a small inner diameter.
[0018]
  Therefore, the aerosol can 10 is made of a liquid in which water is used as a base material and mixed with an auxiliary agent composed of, for example, methanol, ethanol or various ester materials, a low-boiling organic solvent such as dimethyl ether and / or a soluble liquefied gas such as dimethyl ether. A configured cooling medium is enclosed. The low-boiling organic solvent is mixed in a proportion of 5% to 90% by weight with respect to the cooling water, and exhibits a melted or emulsified state depending on its property. Further, the soluble liquefied gas is mixed at a ratio of 5 wt% to 60 wt% with respect to the cooling water.
[0019]
  For example, a cooling medium in which dimethyl ether is dissolved in cooling water has extremely high fluidity compared to a cooling medium containing only cooling water, and the nozzle diameter of the drill head 7 can be reduced to about 1/10 of 0.2 mm. To. The drill head 7 has an injection pressure of 2.0 kg / cm2 of the cooling medium injected from the injection port of the drill bit 7b during the drilling operation. ² Even if it is about, the drilling efficiency is sufficiently maintained. Therefore, the rotary drill device 1 can use the cooling medium effectively and can be used for a long time, and an average of 25 repair holes can be drilled by one aerosol can 10.
[0020]
  Further, the aerosol can 10 has a cooling medium even when the outside air temperature is low, for example.The drop in the injection pressure is minimized and the injection is made from the injection port of the drill bit 7b with a sufficient injection pressure.Therefore, an inert gas such as carbon dioxide gas or nitrogen gas is filled. The inert gas has an internal pressure of the aerosol can 10 of 6.0 kg / cm at an outside air temperature of 25 ° C. ² To 6.5 kg / cm ² An amount sufficient to hold in this range is filled.
[0021]
  In the rotary drill apparatus 1 configured as described above, the operator holds the hand-held portion 2b of the drill body 2 with one hand and the anti-rotation member 8 with the other hand, and the drill bit 7b of the drill head 7 The power switch 2c and the switching lever 9 are operated in a state where is placed on the perforation position of the wall surface or the like. In the rotary drill device 1, the power is supplied to the drive motor by the operation of the switch 2c, the drill head 7 is rotated through the rotary shaft 6, and the repair hole is drilled by the drill bit 7b. Further, the rotary drill device 1 is supplied with a cooling medium from the cooling medium supply unit 4 and ejects the cooling medium into a repair hole drilled from the tip of the drill bit 7b through the cooling medium flow path.
[0022]
  The cooling medium is atomized in the repair hole by the action of the mixed auxiliary agent, and is rapidly vaporized and diffused by the outside air temperature and the frictional heat of the drill bit 7b due to the drilling operation. The drill bit 7b is cooled by the heat of vaporization of the cooling medium.ByDrill repair holes in good condition. In addition, the cooling medium is vaporized in the repair hole and its capacity expands abruptly several hundred times. At the same time, chips and other waste are efficiently discharged to the outside.
[0023]
  In addition, the cooling medium remaining inside the drilled repair hole is accelerated in the repair hole for a short time because evaporation of the cooling water of the base material is promoted by the azeotropic phenomenon with the low-boiling organic solvent and the liquefied gas. Dry with. The rotary drill device 1 has substantially the same time required for drilling a repair hole as that of a conventional rotary drill device using a low-temperature liquefied gas. However, the setup time can be greatly reduced and the efficiency can be improved by a simple operation. Furthermore, since the drying time for repair holes is also about one-tenth, the construction period is greatly reduced.Make it possible to plan. The rotary drill device 1 is small and light.AhTherefore, it is not necessary to route a long hose, so that work at a high place such as a wall surface or a ceiling can be performed safely. In addition, since the rotary drill device 1 does not require a large amount of cooling water, it can be used even on the site without water facilities, and inconveniences such as a water leakage disaster such as downstairs due to the spilled cooling water and on-site contamination. It will not cause.
[0024]
  2 and 3 are views showing the details of the internal structure of the drill main body 2 of the rotary drill apparatus 1 described above. The rotary drill device 1 operates the switching lever 9 while the drill bit 7b is rotated after the operation of the switching lever 9 during the drilling operation and the drilling operation of the repair hole is actually started and when the drilling of the repair hole is completed. In the meantime, a so-called automatic valve mechanism for preventing the coolant from flowing out unnecessarily is provided. In other words, in order to use the cooling medium efficiently, the rotary drill device 1 is supplied from the drill bit 7b only while the cooling medium is actually drilling the repair hole.
[0025]
  The automatic valve mechanism includes a valve member 13 provided in the rotary shaft 6, a coupling member 14 that rotates integrally with the rotary shaft 6, a connecting nozzle member 15 to which the drill head 7 is attached, and the cylindrical housing 5. , A pair of bearings 17A and 17B (hereinafter collectively referred to as bearings 17) for rotatably supporting the rotary shaft 6 in the cylindrical housing 5, and a pair of sealing members. 18A and 18B (hereinafter collectively referred to as a sealing member 18) and members such as a coil spring 19 are configured.
[0026]
  A rotating shaft 6 is rotatably supported by the cylindrical housing 5 with a bearing 17 incorporated therein at a predetermined interval so that one end of the rotating shaft 6 is exposed. The cylindrical housing 5 is divided between the bearings 17 in a liquid-tight manner by a sealing member 18 to form a cooling medium supply space 21. The cooling medium supply space 21 omits the details of opening and closing operation by the switching lever 9.ValveThe cooling medium flow path 23 of the mechanism 22 is communicated.
[0027]
  The rotary shaft 6 is formed with a D-cut portion 6a for chucking by the chucking mechanism of the drill main body portion 2 on the outer periphery of one end portion that protrudes from the cylindrical housing 5 and expands at the other end portion. In addition, a flange portion 6b having a reverse screw 6c formed on the outer periphery is integrally formed to protrude. The rotary shaft 6 is prevented from coming off from the cylindrical housing 5 by the flange portion 6b being abutted against the one bearing 17B. The rotary shaft 6 is provided with a first cooling medium passage 24 in the axial direction therein. In the first cooling medium flow path 24, one end 24a bent toward the outer peripheral side of the rotating shaft 6 communicates with the cooling medium supply space 21, and the other end (opening) 24b is on the flange 6b side. Is open. The first cooling medium flow path 24 has a diameter-expanded space 24c with the diameter of the opening 24b being increased. The expanded diameter space 24c also constitutes a cooling medium flow path as will be described later.
[0028]
  The valve member 13 is incorporated in the diameter expansion space 24c of the rotary shaft 6 so as to be movable in the axial direction. The valve member 13 has a substantially cylindrical shape having an outer diameter dimension slightly smaller than the inner diameter dimension of the expanded diameter space portion 24c. For example, when the cross section is hexagonal, the outer peripheral portion and the expanded diameter space are formed. A space part through which the cooling medium flows is formed between the part 24c and the part 24c. Further, the valve member 13 is urged to the left in FIG. 2 within the first cooling medium flow path 24 by the coil spring 19 incorporated in the enlarged diameter space portion 24c, and the tip end portion closes the opening portion 24b. ing.
[0029]
  The coupling member 14 is formed in a substantially bottomed short cylinder shape having an outer diameter dimension substantially equal to the inner diameter dimension of the cylindrical housing 5, and the first inner screw is screwed into the reverse screw 6 c of the flange portion 6 b. The cooling medium flow path 24 is closed and integrated with one end of the rotary shaft 6. The coupling member 14 includes a first cooling medium flow path 2 provided at the center of the rotating shaft 6.4A cooling medium supply port 14a is provided in communication with the cooling medium supply port 14a. The cooling medium supply port 14a is connected to the first cooling medium flow path 24The inner diameter of the valve member 13 is substantially the same as that of the tip of the valve member 13.
[0030]
  The coupling member 14 is provided with a cylindrical protrusion 14b integrally projecting on one side surface thereof. The cylindrical convex portion 14b has a slightly smaller diameter than the inner diameter of the cylindrical housing 5, and is provided with a key groove 14c. Although not described in detail, the coupling member 14 is liquid-tight by a shield ring that is fitted into a butt end with the rotating shaft 6.
[0031]
  The connection nozzle member 15 is configured by a round bar member having a smaller diameter than the inner diameter of the cylindrical convex portion 14b of the coupling member 14, and the second cooling medium flow path 25 is provided in the inside thereof over the entire length in the axial direction. Is provided. Further, the connecting nozzle member 15 is integrally provided with an axial valve driving convex portion 15a having a diameter slightly smaller than the inner diameter of the cooling medium supply port 14a at one end thereof, and at the outer periphery of the other end portion. A reverse screw 15b is formed.
[0032]
  A key 20 that engages with a key groove 14 c provided in the cylindrical convex portion 14 b of the coupling member 14 is fitted to the outer peripheral portion of the coupling nozzle member 15. Accordingly, the connecting nozzle member 15 is movable in the axial direction with respect to the coupling member 14 and is integrated with the coupling member 14 in other words, in other words, the rotating shaft 6 with respect to the rotational direction. The drill head 7 is fixed to the connecting nozzle member 15 by using a reverse screw 15b provided at the other end.
[0033]
  As shown in FIG. 3, the second cooling medium flow path 25 has one end 25 a via the valve member 13, and the first cooling medium flow path 2.4Communicated with. The second cooling medium flow path 25 isAs shown in FIG.The nozzle part 25b is comprised by making the other edge part side into a small diameter. As described above, the nozzle portion 25b has a diameter of 0.2 mm, and the cooling medium supplied from the cooling medium supply unit 4 and flowing in the second cooling medium flow path 25 to the drill head 7 as described later. Let spray.
[0034]
  The fixing member 16 has a bottomed cylindrical shape having an outer diameter dimension substantially equal to the inner diameter dimension of the cylindrical casing 5, and is firmly attached to the inside thereof so as to close one opening of the cylindrical casing 5. It is fixed. The fixed member 16 is provided with a shaft hole at the center thereof, and faces one end of the connecting nozzle member 15 outward. The fixing member 16 is a shield ring that is fitted on the outer periphery of the cylindrical convex portion 14b, although details are omitted.The inside of the cylindrical housing 5 is liquid-tight via the.
[0035]
  Automatic valve machine configured as aboveStructureIn the rotary drill device 1 provided, the cooling medium is efficiently supplied to the drill head 7 only while the repair hole is actually drilled in the wall surface or the like. The cooling medium is generated when the switching lever 9 is operated.ValveAs the mechanism 22 opens, it cools.MediumThe cooling medium supply space 21 is filled through the flow path 23. The cooling medium is further filled into the first cooling medium flow path 24 of the rotating shaft 6 from the cooling medium supply space 21. As described above, since the first cooling medium flow path 24 is closed by the valve member 13 urged by the elastic force of the coil spring 19 in the first cooling medium flow path 24, the first cooling medium flow path 24 of the connecting nozzle member 15 is used. The second cooling medium flow path 25 is not supplied.
[0036]
  In the rotary drilling apparatus 1, pressure is applied to the drill head 7 as the repair hole is drilled, so that the connecting nozzle member 15 moves in the first cooling medium flow path 24 as shown by an arrow A in FIG. Moves to the right side of the figure. Accordingly, the connecting nozzle member 15 moves the valve member 13 to the right side in the drawing against the elastic force of the coil spring 19 by the valve driving convex portion 15a. The valve member 13 releases the closed state of the opening 24b of the first cooling medium flow path 24 by this moving operation. Therefore, in the rotary drill device 1, the cooling medium flows from the first cooling medium flow path 24 into the second cooling medium flow path 25 of the connection nozzle member 15 through the opening 24b, and further through the nozzle section 25b. Then, the spray is supplied to the drill head 7.
[0037]
  The rotary drill device 1 is configured to automatically operate the automatic valve machine by releasing the drill head 7 from the wall surface after completing the drilling operation of the repair hole.StructureIn operation, the supply of the cooling medium is automatically stopped. That is, the valve member 13 releases the pressing force applied from the drill head 7 through the connection nozzle member 15, and thereby the inside of the first cooling medium flow path 24 in FIG. Move back to the left. The valve member 13 closes the opening 24b of the first cooling medium flow path 24 by a tip portion thereof to block between the first cooling medium flow path 24 and the second cooling medium flow path 25. Thus, the supply of the cooling medium to the drill head 7 is stopped.
[0038]
  As described above, the rotary drill device 1 is supplied with a cooling medium only when a force in the direction opposite to the drilling direction is applied to the drill head 7 regardless of the rotational operation of the drill head 7. By comprising, a cooling medium is used efficiently. Moreover, since the rotation drill apparatus 1 does not use the cooling medium more than necessary as described above, the contamination of the wall surface and the floor can be kept to a minimum range.
[0039]
  As shown in FIGS. 4 to 6, the present invention is also developed in an attachment device 40 for a rotary drill device that is attached to and detached from a small rotary drill device 35 that is commercially available. The attachment device 40 includes a device main body 41 and a cooling medium supply unit 42 that supplies a cooling medium to the device main body 41. Note that the cooling medium supplied to the attachment device 40 and the aerosol can 68 filled with the cooling medium are the same as the cooling medium and the aerosol can 10 described above, and therefore the details thereof are omitted.
[0040]
  As shown in FIG. 4, the rotary drill device 35 has a mounting flange plate 36a integrally formed on one side of a housing 36 in which a motor (not shown) is incorporated, and a hand-held portion 36b provided on the other side. Yes. As will be described later, an attachment device 40 is attached to the rotary drill device 35 via a mounting flange plate 36a. In the rotary drill device 35, a power switch 37 is disposed on the hand-held portion 36b. When the power switch 37 is operated, the drive motor is turned on and the rotary shaft 38 shown in FIG. 5 is rotationally driven. .
[0041]
  One end portion of the rotating shaft 38 protrudes from the housing 36 and is located inside the cylindrical housing 43 in a state where the attachment device 40 is attached. The rotating shaft 38 is provided with a chucking mechanism 39 whose details are omitted at the exposed end portion. The chucking mechanism 39 faces an opening 43b provided in the cylindrical housing 43 as shown in FIG. 5, and a plurality of chucking levers 39a are converged by a rotation operation of a chucking key inserted from the opening 43b. One end portion of the drive shaft member 44 of the attachment device 40 which will be expanded and described later44aPut on and take off.
[0042]
  The attachment device 40 includes a cylindrical housing 43 that forms the device main body 41, a drive shaft member 44, and each member that includes the drive shaft member 44 and forms an automatic valve mechanism 45 to be described later.(Fixed cylinder member 46, oil seal 47, ball bearing bearing 48, valve member 49, coil spring 50, outer cylinder member 51, connecting nozzle member 53, key 54, stopper 55, etc.)And a nozzle member 56 and a supply pipe member 57. The attachment device 40 includes a drill head 58 that is attached to and detached from the device main body 41, a dust scattering prevention mechanism 59 that is disposed at the tip of the drill head 58 to prevent dust and the like from being scattered, and these drills. A guide mechanism 60 for guiding the head 58 and the dust scattering prevention mechanism 59 is provided.
[0043]
  The attachment device 40 includes a cooling medium supply space 61 in which the cooling medium is supplied from the cooling medium supply unit 42 into the apparatus main body 41, and a first cooling medium flow path 62 that is opened and closed by the automatic valve mechanism 45. A second cooling medium flow path 63 is formed. The attachment device 40 has a third cooling medium flow path 64 communicating with the second cooling medium flow path 63 inside the drill head 58, as will be described in detail later.
[0044]
  Furthermore, the attachment device 40 includes:Casing bodyA holder casing 65 comprising 66 and a lid member 67;Casing body 66LoadedNot shownThe cooling medium supply unit 42 is configured by the aerosol can, the hose 69 connecting the holder casing 65 and the apparatus main body 41, and the harness belt 70.
[0045]
  In the apparatus main body 41, a cylindrical housing 43 is integrally formed of a lightweight metal material or the like, and constitutes an external member of the apparatus main body 41 together with a fixed cylinder member 46 and an outer cylinder member 51 of an automatic valve mechanism 45 described later. As shown in FIG. 5, the cylindrical housing 43 is inserted with the rotating shaft 38 of the rotary drill device 35 from the opening 43c on one end side thereof, and has an inner peripheral screw made of a reverse screw in the opening on the other end side. The fixed cylinder member 46 is fixed with screws. Further, the cylindrical casing 43 is integrally formed with a guide cylinder portion 43d through which a guide shaft member 87 constituting a guide mechanism 60 described later is penetrated and supported on the outer peripheral portion. Further, as shown in FIG. 4, the cylindrical housing 43 is provided with a rotation stop lever 71 on a side surface thereof. The stop lever 71 constitutes an operator's grip part together with the hand-held part 36b on the rotary drill device 35 side when the repair hole is drilled.
[0046]
  The automatic valve mechanism 45 includes a drive shaft member 44 and a fixed cylinder member 46, a pair of oil seals 47A and 47B (hereinafter collectively referred to as an oil seal 47), and a pair of ball bearing bearings 48A and 48B (hereinafter referred to as an oil seal 47). And a valve member 49, a coil spring 50, an outer cylinder member 51, a coupling member 52, a coupling nozzle member 53, a key 54, a stopper 55, and the like. . The automatic valve mechanism 45 increases the amount of use of the cooling medium by supplying the cooling medium to the drill head 58 described later only while the repair hole is actually drilled.
[0047]
  As described above, one end 44a of the drive shaft member 44 is chucked by the chucking mechanism 39 of the rotary drill device 35, and the rotary drill device 35 is powered on to drive the drive motor.38And is driven to rotate through a chucking mechanism 39. As shown in FIG. 5, the drive shaft member 44 is integrally formed with a large-diameter flange portion 44b on the other end side. Further, the drive shaft member 44 is provided with a first cooling medium flow path 62 formed of an axial blind hole at the tip end side thereof, and communicates with the first cooling medium flow path 62 and the other end side is a flange. An axial fitting hole 44c is provided in the portion 44b. The drive shaft member 44 forms a valve step portion 44d at the connecting portion thereof by making the inner diameter dimension of the first cooling medium flow path 62 slightly smaller than the inner diameter dimension of the fitting hole 44c.
[0048]
  The drive shaft member 44 is described in detail later.FirstA valve member 49 and a coil spring 50 are incorporated in the cooling medium flow path 62. The drive shaft member 44 is fitted with one end portion of the connection nozzle member 53 in the fitting hole 44c as will be described in detail later. Further, the drive shaft member 44 includesFirstA cooling medium flow path 44e is formed to connect between the cooling medium flow path 62 and the cooling medium supply space 61 formed on the outer periphery.
[0049]
  The drive shaft member 44 is rotatably supported inside the fixed cylinder member 46 via a bearing 48. As described above, one end of the fixed cylinder member 46 is screwed and fixed to the cylindrical casing 43, andOtherBy fixing the outer cylinder member 51 to the end portion via an inner peripheral screw, an external member of the apparatus main body 41 is configured together with these members. The fixed cylinder member 46 is fitted with a presser plate 72 so that the drive shaft member 44 penetrates through one opening, and is positioned inside the presser plate 72 and the flange portion 44b and separated from each other in the axial direction. Each bearing 48 is incorporated.
[0050]
  The fixed cylinder member 46 has an oil seal 47 that is positioned inside the bearing 48 and that constitutes the cooling medium supply space 61 in the opposed space. Further, as shown in FIG. 5, the fixed cylinder member 46 is provided with a connection hole 46 a having an inner peripheral screw into which a later-described supply pipe member 57 is screwed so as to communicate with the cooling medium supply space 61. .
[0051]
  The valve member 49 has a substantially hexagonal cross section whose outer diameter is slightly smaller than the inner diameter of the first cooling medium flow path 62 provided in the drive shaft member 44. It is incorporated in the flow path 62 so as to be movable in the axial direction. Further, the valve member 49 has an outer shape and an axial space is formed between the outer peripheral portion and the first cooling medium flow path 62, and the first cooling medium flow path 62 and the first cooling medium flow path 62 are formed through the space. Second cooling medium flow path 63Can communicate with each other. Further, the valve member 49 is integrally formed with a valve convex portion 49a that can project into an axial hole 52a from an opening 52b of a coupling member 52, which will be described later.
[0052]
  The valve convex portion 49 a faces the valve driving portion 53 a configured at one end portion of the connection nozzle member 53. The valve member 49 is urged to the left in FIG. 5 by a coil spring 50 that is incorporated in the first cooling medium flow path 62 in a slightly compressed state, whereby the valve convex portion 49 a is coupled to the coupling member 52. Opening52bAnd the first cooling medium flow path 62 is closed.
[0053]
  The coupling member 52 has an overall bottomed cylindrical shape having an outer diameter substantially equal to the fitting hole 44c provided in the flange portion 44b of the drive shaft member 44 and having a shaft hole 52a opened at one end. ing. Although the coupling member 52 is omitted in detail, its outer peripheral portionAnd a fitting hole 44c of the drive shaft member 44,It is liquid-tight. The coupling member 52 has an opening 52b that communicates with the first cooling medium flow path 62 described above at the center of the bottom thereof, and a disk-like flange portion 52c that integrally protrudes from the outer periphery.
[0054]
  The coupling member 52 is combined with the drive shaft member 44 with its bottom face abutted against the valve step 44d and the flange 52c abutted with the flange 44b. The coupling member 52 and the drive shaft member 44 are integrated with each other by a set screw 73 that is provided at a position where the flange portions 52c and 44b face each other and is screwed into a screw hole communicating with each other. Further, the coupling member 52 has an inner wall of the shaft hole 52a.Key 54 engagesAn axial keyway 52d is provided, and this keyway 52dAnd key 54Thus, the connecting nozzle member 53 is integrated in the rotational direction and is movable in the axial direction.
[0055]
  The connection nozzle member 53 is formed of a round bar member having an outer diameter that is slightly smaller than the inner diameter of the shaft hole 52 a of the coupling member 52. Connecting nozzle member 53InOne end of the valve protrusion 49a of the valve member 49 described aboveHitAs will be described later, the valve member 49 moves the valve member 49 in the axial direction against the elastic force of the coil spring 50.Configured asThe connection nozzle member 53 is provided with a second cooling medium flow path 63 over the entire length in the axial direction. Further, one end of the connection nozzle member 53 is exposed from the coupling member 52, and a reverse screw 53b for attaching a drill head 58 to be described later is formed on the outer periphery of the exposed end.
[0056]
  The connecting nozzle member 53 is integrated with the coupling member 52 in the rotational direction as described above by the relative engagement of the key 54 fixed to the outer periphery thereof with the key groove 52d of the coupling member 52. In addition, it is movable in the axial direction. The connecting nozzle member 53 has its axial movement range restricted by the key 54 abutting against a stopper 55 provided on the coupling member 52 side. A nozzle member 56 is attached to the connecting nozzle member 53 on one end side where the reverse screw 53b is provided.
[0057]
  As shown in FIG. 5, the nozzle member 56 has a substantially cap shape as a whole, and is connected to the second cooling medium flow path 63 in a state of being attached to the connection nozzle member 53, and has a slightly enlarged diameter cooling medium flow path. 56a and a small-diameter nozzle hole 56b continuous with the cooling medium flow path 56a are provided therein. As will be described later, the nozzle member 56 injects and supplies the cooling medium supplied to the third cooling medium flow path 64 of the drill head 58 to the drill head 58 by the action of the nozzle hole 56b.
[0058]
  As described above, the supply pipe member 57 is attached to the fixed cylinder member 46 by screwing one end thereof into the connection hole 46a. As shown in FIG. 4, a hose 69 is attached to the supply pipe member 57 at the other end to connect the cooling medium supply unit 42 described later. Although not described in detail, the supply pipe member 57 is provided with a valve mechanism. Supply of the cooling medium supplied from the cooling medium supply unit 42 to the apparatus main body 41 by rotating the switching lever 74 is performed.・ Blocking is performed.
[0059]
  Further, the supply pipe member 57 is omitted in detail, but a structure is adopted in which the tip is divided into, for example, two parts and these are integrated by a cylindrical ring member. The supply pipe member 57 is loaded with a filter 75 from one side where the ring member is removed and divided. As shown in FIG. 5, the filter 75 is loaded on the front end side of the supply pipe member 57, removes relatively large foreign matters such as dust mixed in the cooling medium, and clogs each cooling medium flow path and nozzle section in the subsequent stage. To prevent. The filter 75 is formed by porous sintered metallurgy, and for example, a wire mesh or a non-woven fabric is also used. The filter 75 is replaced at an appropriate time by removing the ring member.
[0060]
  In the apparatus main body 41 configured as described above, the drill head 58 is attached to the distal end portion of the connection nozzle member 53. As shown in FIG. 6, the drill head 58 includes a drill bit support member 76, a drill bit 77 attached to the tip of the drill bit support member 76, and a filter 78 loaded in the drill bit support member 76. It is composed of The drill bit support member 76 is formed of a stepped cylindrical member having a slightly larger diameter at the base end portion 76a, and a third cooling medium flow path 64 is formed in the inside thereof over the entire length in the axial direction.
[0061]
  The drill bit support member 76 has an inner diameter dimension of the base end portion 76a substantially equal to an outer diameter dimension of the distal end portion of the connection nozzle member 53, and a first inner peripheral screw 76b made of a reverse screw is formed on the inner peripheral wall. . The drill bit support member 76 is attached to the connection nozzle member 53 by the first inner peripheral screw 76b being screwed into the outer peripheral screw 53b. The drill bit support member 76 is formed with a filter loading space 76d at the tip 76c so that the third cooling medium flow path 64 has a larger diameter. Further, the drill bit support member 76 has a second inner peripheral screw 76e formed of a reverse screw on the inner peripheral wall constituting the filter loading space 76d.
[0062]
  The drill bit 77 is attached to the distal end portion of the drill bit support member 76 by the second inner peripheral screw 76e. The drill bit 77 is formed in a cylindrical shape from a sintered alloy in which diamond grains are mixed, and a cooling medium flow path 77a is formed in the inside over the entire length in the axial direction. The drill bit 77 is formed with a reverse screw that is screwed into the second inner peripheral screw 76e of the drill bit support member 76 on the outer periphery of the base end portion. Therefore, the drill bit 77 is separated from the drill bit support member 76 and replaced when it is worn with the drilling operation. In other words, in the attachment device 40, only the drill bit 77 can be replaced without replacing the entire drill head 58, and maintenance when the cooling medium flow path 77a is clogged is facilitated.
[0063]
  The drill bit 77 has a nozzle with a small diameter in a part of the cooling medium flow path 77a.Hole77b is formed. The drill bit 77 has this nozzle.HoleA coolant injection port 77c is opened at the distal end portion through 77b. Further, although the details are omitted in the drill bit 77, in order to efficiently discharge the cutting powder from the inside of the repair hole to be drilled to the outside, the tip of the outer peripheral wall constituting the cooling medium injection port 77c is provided from the tip thereof. A slit-like groove is formed in the axial direction.
[0064]
  For example, the drill bit 77 has a nozzle when drilling a repair hole of 4.5 mm to 8 mm.HoleThe inner diameter of 77b is 0.3 mm or less. The drill bit 77 is a nozzle when drilling a repair hole of about 18 mm to 20 mm.HoleThe inner diameter of 77b is 0.5 mm. The drill bit 77 injects the cooling medium from the cooling medium injection port 77c with a sufficient injection pressure.
[0065]
  In the attachment device 40 described above, nozzles are respectively connected to the drill bit 77 of the drill head 58 and the nozzle member 56 attached to the connecting nozzle member 53.Hole77b and nozzleHole56b is provided. In the attachment device 40, the nozzleHole77bOr nozzle holeOf course, any one of 56b may be provided.
[0066]
  As described above, the drill head 58 is connected to the drill bit 77 with the nozzle.HoleBy providing 77b, the spray pressure of the aerosol can 68 can be reduced to just before that.RetentionIs done. Therefore, in the drill head 58, the loss of the injection pressure in the third coolant flow path 64 is reduced as compared with the case where the nozzle member 56 is simply attached to the connection nozzle member 53. In the attachment device 40, the cooling medium is injected and supplied at a high pressure from the cooling medium injection port 77c to the repair hole drilled by such a configuration to efficiently cool the drill bit 77 and reliably generate dust from the repair hole. To remove.
[0067]
  The filter 78 is made of porous sintered metallurgy, and is disposed immediately before the nozzle portion 77b having a small diameter, thereby preventing clogging of the nozzle portion 77b. In the attachment device 40, as described above, the filter 50 is also loaded inside the supply pipe member 57 to remove relatively large dust mixed in the cooling medium. However, the drive shaft member 44 rotates at a high speed. Fine dust generated from the oil seal 47 and the bearing 48 is removed by the filter 78. Therefore, the filter 78 is finer than the filter 50.
[0068]
  The apparatus main body 41 configured as described above is provided with a dust scattering prevention mechanism 59 in order to prevent scattering of dust generated from the repair hole drilled by the drill head 58. As shown in FIG. 4, the dust scattering prevention mechanism 59 includes a cover member 80, a mounting bracket member 81, and a gelled dust discharge guide member, a set screw, a discharge pipe, an attachment 84, and the like (not shown). It is configured. In the dust scattering prevention mechanism 59, the dust that has been mixed with the cooling medium and formed into a gel as the repair hole is drilled is formed in the inner space portion of the cover member 80.Within 80aDischarged furtherA dust outlet (not shown) is connected to the internal space 80a.It is discharged to the outside through. In the dust scattering prevention mechanism 59, the cover member 80 is tightly held on the wall surface or the like by the guide mechanism 60 in a state where the repair hole is drilled by the drill bit 77 of the drill head 58.
[0069]
  As shown in FIG. 4, the guide mechanism 60 includes a guide cylinder portion 43d formed integrally with the above-described cylindrical casing 43, a guide shaft member 87 penetrating through the guide cylinder portion 43d, a coil spring 88, and the like. The guide shaft member 87, whose details are omitted, is configured by members such as a retaining cap, an end pin, and a stopper member for retaining the guide shaft member 87. The outer diameter of the guide shaft member 87 is slightly smaller than the inner diameter of the guide hole of the guide cylinder portion 43d, and one end portion thereof is inserted by being secured by an end pin. The other end of the guide shaft member 87 is penetrated through a guide hole provided in the mounting bracket member 81 that constitutes the dust scattering prevention mechanism 59, and is secured by a retaining cap. The guide shaft member 87 has a length dimension that positions the opening of the cover member 80 so as to constitute substantially the same plane as the drill bit 77 in the state of being most protruded from the guide tube portion 43 d.
[0070]
  The guide mechanism 60 presses the cover member 80 against the wall surface by the elastic force of the coil spring 88 in a state where the drill head 58 is driven to rotate and a repair hole is drilled in the wall surface or the like. The dust scattering prevention mechanism 59 described above causes the attachment 84 to be elastically deformed and closely adheres to the wall surface, and keeps the dust scattering prevention by the cover member 80 and reduces the generation of vibration noise. The guide mechanism 60 is a drill that advances into the wall surface as the repair hole is drilled.Bit 77In response to this drillBit 77The relative position between the cover member 80 and the cover member 80 is adjusted and guided. That is, the guide mechanism 60 is a drillBit 77The cover member 80 moves in the anti-drilling direction along the guide shaft member 87 while compressing the coil spring 88 as it enters the wall surface.By the elastic force of the coil spring 88The cover member 80 is kept in close contact with the wall surface. The guide mechanism 60 prevents scattering of dust and the like generated from the repair hole to be drilled by the cover member 80 described above and keeps the vibration noise reducing action.
[0071]
  The attachment device 40 configured as described above is set.By the worker in stateWhen the switching lever 74 is switched,,A cooling medium is supplied from the cooling medium supply unit 42 to the apparatus main body 41. As described above, the cooling medium is injected and supplied from the injection port 77c of the drill bit 77 into the repair hole only while the repair hole is drilled by the action of the automatic valve mechanism 45 as described above. The cooling medium supply unit 42 has been described above.likeCooling mediumNot shownIt consists of an aerosol can, a casing body 66 and a lid member 67.Inside the casing body 662 aerosol cansCollectA holder casing 65 to be housed, a hose 69 whose one end is connected to the supply pipe member 57 of the apparatus main body 41, and a harness belt 70 and the like are configured.
[0072]
  The holder casing 65 has a harness belt 70 attached to an attachment portion 66d formed integrally with the casing body 66, and is attached to an operator's waist or the like. The holder casing 65 is assembled to the casing main body 66 through a hinge mechanism (not shown) so that the lid member 67 can be opened and closed. The stem driving mechanism provided on the inner surface of the lid member 67 presses the stem of the aerosol can to cool it. Make the medium spout. The cooling medium is guided to the hose 69 from the supply pipe member 108 provided on the lid member 67 and supplied to the apparatus main body 41. The supply pipe member 108 is provided with a valve mechanism inside and supplies and shuts off the cooling medium to the apparatus main body 41 by switching the switching lever 109.
[0073]
  Also in the attachment device 40 including the automatic valve mechanism 45 configured as described above, the cooling medium is drill bit 77 only while the repair hole is actually drilled in the wall surface or the like as in the rotary drill device 1 described above. To be supplied efficiently. In the attachment device 40, the cooling medium is supplied from the cooling medium supply unit 42 to the device main body 41 by switching the switching lever 109. The cooling medium is filled into the cooling medium supply space 61 of the drive shaft member 44 via the supply pipe member 108, the hose 69, and the supply pipe member 57. The cooling medium is further filled from the cooling medium supply space 61 into the first cooling medium flow path 62 formed inside the drive shaft member 44 via the cooling medium flow path 44e. As described above, the cooling medium is provided in the connecting nozzle member 53 because the opening of the first cooling medium flow path 62 is closed by the valve member 49 urged by the elastic force of the coil spring 50. The second cooling medium flow path 63 is not supplied.
[0074]
  In the attachment device 40, the connection nozzle member 53 is formed in the coupling member 52 in the second cooling medium flow path 63 by a reaction force caused by the drill head 58 being pushed into the wall surface as the repair hole is drilled. Is moved to the right in FIG. As a result, the valve driving portion 53a of the connecting nozzle member 53 abuts on the valve convex portion 49a to move the valve member 49 to the right side in the figure against the elastic force of the coil spring 50. The valve member 49 opens the coupling member 52 by this moving operation.52bAnd the closed state of the second coolant flow path 63 is released. Therefore, in the attachment device 40, the cooling medium is opened from the first cooling medium flow path 62 provided in the drive shaft member 44 to the opening of the coupling member 52.52bThen, it flows into the second cooling medium flow path 63 formed in the connection nozzle member 53. The cooling medium further passes through the nozzle member 56 and the drill head.58And injected into the third cooling medium flow path 64 formed in the above.
[0075]
  In the attachment device 40, when the drilling operation of the repair hole is finished and the drill head 58 is released from the wall surface or the like, the automatic valve mechanism 45 operates and the supply of the cooling medium is automatically stopped. That is, the valve member 49 releases the pressing force applied from the drill head 58 via the connection nozzle member 53, so that the elastic force of the coil spring 50 allows the valve member 49 to move inside the first cooling medium flow path 62. Move back to the left. As a result, the valve protrusion 49a of the valve member 49 is an opening of the coupling member 52.52bThe first cooling medium flow path 62 and the second cooling medium flow path 63 are closed and blocked. Therefore, the automatic valve mechanism 45 automatically stops the supply of the cooling medium to the drill head 58.
[0076]
  As described above, the attachment device 40 supplies the cooling medium only when a force in the direction opposite to the drilling direction of the repair hole is applied to the drill head 58 regardless of the rotational operation of the drill head 58. With this configuration, the cooling medium is used efficiently. Further, the attachment device 40 does not use a cooling medium more than necessary as described above, so that the contamination of the wall surface, floor, etc. is kept to a minimum range.
[0077]
  In addition, in the rotary drill apparatus and attachment apparatus of each embodiment mentioned above, although the case where the repair hole for repair was drilled in a wall surface, a ceiling, etc. was demonstrated, it is not limited to this about the use. Of course.
[0078]
【The invention's effect】
  As described above in detail, the rotary drill device according to the present invention is provided.In placeAccording toBy automatic valve mechanismSince the cooling medium is supplied from the drill head into the drilling hole only while the drilling operation is performed by the drill head, the cooling medium is effectively used and the unnecessary cooling medium is scattered to contaminate the surroundings. The occurrence of such a situation is prevented. Rotating drill equipmentIn placeAccording toFor supplying the cooling medium in the drillingThe opening / closing operation of the valve member is unnecessary, and the operability is improved. Rotating drill equipmentIn placeAccording toAutomaticThe valve mechanism is combined with the rotating shaftA valve member and an elastic member are incorporated in the coupling member, and a pressing force from the drill head is applied to the valve member via the connecting nozzle member in accordance with the drilling operation.Since it is configured with a simple structure, it is possible to achieve a reduction in size and weight and at a low cost.
[Brief description of the drawings]
FIG. 1 relates to the present invention.AutomaticIt is a principal part perspective view of the rotary drill apparatus provided with the valve mechanism.
FIG. 2 is a longitudinal sectional view of a main part showing details of an internal structure of the rotary drill device.
FIG. 3 is a longitudinal sectional view of a main part for explaining the configuration of the automatic valve mechanism.
FIG. 4 is a perspective view of a main part of an attachment device for a rotary drill device provided with an automatic valve mechanism according to the present invention.
FIG. 5 is a longitudinal sectional view of a main part for explaining the configuration of the automatic valve mechanism.
FIG. 6 is a longitudinal sectional view of a main part for explaining the configuration of the drill head.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 1 Rotating drill apparatus, 2 Drill main-body part, 3 Drill part, 4 Cooling medium supply part, 5 Cylindrical housing (outer cylinder member), 6 Rotating shaft, 7 Drill head, 10 Aerosol can, 11 Holder casing, 13 valve member, 14 coupling member, 15 connecting nozzle member,16 fixing member, 17 bearing, 18 sealing member,19 Coil spring, 21 Cooling medium supply space, 22 Valve mechanism, 23 Cooling medium flow path,24 1st cooling-medium flow path, 25 2nd cooling-medium flow path, 35 Rotary drill apparatus,38 Rotating shaft, 39 Chucking mechanism, 40 Attachment device, 41 Device body,42 Cooling medium supply unit, 43 cylindrical casing, 44 drive shaft member,45 Automatic valve mechanism,46 fixed cylinder member, 47 oil seal, 48 ball bearing,49 Valve member, 50 Coil spring,51 outer cylinder member,52 coupling member, 53 connecting nozzle member, 56 nozzle member, 58 drill head,62 first cooling medium flow path, 63 second cooling medium flow path, 64 third cooling medium flow path,65 holder casing,77 Drill Bit

Claims (1)

A cooling medium supply unit composed of a portable holder and an aerosol can that is contained inside the holder and encloses a cooling medium mixed with an organic solvent having a low boiling point characteristic using a liquid as a base material;
A rotary shaft that is rotationally driven by a drive motor and that has a first cooling medium flow path formed therein with a bottomed hole that opens to a tip side to which the cooling medium is supplied from the cooling medium supply unit ;
A coupling member provided integrally with the tip of the rotating shaft and provided with a cooling medium supply port communicating with the opening of the first cooling medium flow path;
The first cooling medium flow fixed inside the coupling member with respect to the rotation direction and movably combined with respect to the axial direction, and formed inside the rotation shaft via the cooling medium supply port. A connecting nozzle member formed over the entire length of the second cooling medium flow path communicating with the opening of the path;
A valve member provided in the first cooling medium flow path of the rotating shaft so as to be movable in the axial direction, and opening and closing an opening of the first cooling medium flow path;
The valve member is urged toward the second cooling medium flow path to close the opening of the first cooling medium flow path, whereby the first cooling medium flow path and the above-mentioned valve member are closed. An elastic member for providing a closing behavior with the second cooling medium flow path;
A cooling medium flow path that communicates with the second cooling medium flow path is formed over the entire length and is attached to and detached from the distal end portion of the connection nozzle member. A drill head for supplying
The first cooling medium flow is resisted against the elastic force of the elastic member due to the pressing force from the drill bit that is pressed against the drilling location by the valve member through the connecting nozzle member during the drilling operation. The cooling medium supplied from the cooling medium supply unit is moved in the direction in which the opening is opened in the path, so that the first cooling medium flow path, the second cooling medium flow path, and the cooling medium A rotary drilling device that performs a drilling operation while spraying from the drill bit into the drilling through a flow path .

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