Drilling bit tool and lubrication water circulation drilling system

Abstract

To provide a drilling bit tool and a lubrication water circulation drilling system, capable of easily coping with an installation surface without water leakage even when a drilling angle is changed.SOLUTION: A drilling bit tool 20 includes: a bit 23 for drilling an object to be drilled; a rod bar 22 detachably connected to the bit and having a flow path for lubrication water inside a cylindrical body; and a driving part 21 configured to connect the rod bar to another rod bar, support the rod bar, and rotate the bit by rotating the rod bar, wherein an outer diameter D1 of the bit is 25 mm or less, and an outer diameter D2 of the rod bar is 98% or less and 95% or more with respect to the outer diameter D1 of the bit.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a drilling bit tool and a lubricating water circulation drilling system for performing deep drilling by adding a shaft while supplying lubricating water to the processing position of a member to be drilled.

Background Art

[0002] Conventionally, drilling devices for drilling members to be drilled such as concrete, high-strength concrete, tiles, and stones have been proposed (see Patent Document 1). In the drilling device described in Patent Document 1, a bit for drilling a member to be drilled is attached to the tip of a rotating shaft. Further, it also has a guide configuration for guiding the rotating shaft for drilling holes on the working surface. In addition, in the drilling device, not only vertical drilling but also drilling from an inclined direction can be performed, and a configuration using a lubricating water circulation type device that supplies, collects, filters, and then reuses lubricating water to the working site is also known (see Patent Document 2). In addition, various proposals have been made regarding configurations for avoiding the vibration of the shaft (drill rod) when performing deep drilling (for example, see Patent Documents 3 and 4).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when performing deep drilling operations by adding a shaft (lot rod) while drilling with bits as in the prior art, there has been a demand for further improvement by achieving both ensuring a flow path for sludge (a mixture of lubricating water and cutting powder) in the hole and suppressing vibration of the shaft (lot rod). The present invention has been devised in view of the above-described demand, and an object thereof is to provide a drilling bit tool and a lubricating water circulation drilling system that can appropriately perform drilling operations even when adding a lot rod for drilling.

Means for Solving the Problems

[0005] To solve the above problems, a drilling bit tool according to the present invention includes a bit for drilling a workpiece, a lot rod detachably connected to the bit and having a flow path for lubricating water inside the cylindrical shape, and a drive unit that connects and supports the lot rod to another lot rod and rotates the bit by rotating the lot rod. In the drilling bit tool, the outer diameter of the bit is 25 mm or less, and the outer diameter of the lot rod is configured to be 98% or less and 95% or more of the outer diameter of the bit.

[0006] To solve the above problems, a lubricating water circulation drilling system according to the present invention includes a drilling bit tool, a guide mechanism arranged in parallel along a lot bar of the drilling bit tool to linearly guide the drilling bit tool, and lubricating water is supplied to the tip side of the bit through a flow path in the lot bar. A lubricating water circulation device that collects and filters sludge in which the chips generated during drilling and the lubricating water are mixed through a bush holder that is inserted and attached to the drilling start surface of the workpiece to be drilled and circulates it as the lubricating water. A lubricating water circulation drilling system, wherein the guide mechanism includes a fixing base fixed to the workpiece to be drilled, a linear support column continuous with the front fixing base, a slide block slidably attached to the support column, and a mounting support portion detachably attached to the slide block and supporting the drilling bit tool. The support column has a length equal to or greater than the length of one of the connected lot bars and equal to or less than the length of two of the lot bars. The lubricating water circulation device includes a water storage tank arranged in a housing for storing the lubricating water, a supply pump for supplying the lubricating water in the water storage tank to the lot bar through a supply hose, and a dust collection drive unit for collecting the sludge from the bush holder into a filter arranged in the housing through a dust collection hose.

Effect of the Invention

[0007] In the drilling bit tool and the lubricating water circulation drilling system according to the present invention, even when shafts are connected to form deep holes, a sludge flow path is ensured and the vibration of the shafts is suppressed to perform a drilling operation for appropriately drilling deep holes.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0009] Hereinafter, an embodiment of a lubricating water circulation drilling system and a drilling bit tool in an embodiment of the present invention will be described below with reference to the drawings. In each figure, up, down, left, right, front, and rear are shown formally and do not indicate absolute directions. In addition, in each configuration, a part may be exaggeratedly described. Furthermore, in the following description, an example will be described in which it is installed in concrete as an object to be drilled and drilled with a predetermined position on the concrete as a drilling start surface.

[0010] <Lubricating Water Circulation Drilling System> As shown in FIG. 1, the lubricating water circulation drilling system 100 includes a lubricating water circulation device 50, a drilling bit tool 20 that receives the supply of lubricating water from the lubricating water circulation device 50 and performs drilling operations, and a guide mechanism 10 that guides the drilling bit tool 20. In the lubricating water circulation drilling system 100, it is preferably further provided with a vacuum pump 30 for fixing the fixed base 1 of the guide mechanism 10 to the installation surface W, a dust collection drive unit 60 of the lubricating water circulation device 50, a foam blocking mechanism 70 of the lubricating water circulation device 50, a drive source 41 for driving the drilling bit tool 20, and a power supply device 40 responsible for the power supply of the vacuum pump 30 and the like.

[0011] <drilling bit tool> As shown in FIGS. 1 to 3, as an example, the drilling bit tool 20 is guided by the guide mechanism 10 and drills concrete. This drilling bit tool 20 includes an electric drive motor 21, a lot rod 22 that is connected to the output shaft 21a (see FIG. 4) of the electric drive motor 21 and rotates, and a bit 23 that serves as a cutting edge installed at the tip of the lot rod 22. The lot rod 22 is formed such that its interior is hollow and has a lubricating water flow path 22e over its longitudinal direction. Further, the lot rod 22 has a connection portion formed at the end opposite to the side where the bit 23 is provided, and is formed so as to be connected to another prepared lot rod 22 for connection to adjust the length according to the purpose of the shaft length. The drilling bit tool 20 is provided with a water injection portion 24 on the side where the lot rod 22 is connected, which sends lubricating water into the flow path 22e of the lot rod 22. The water injection portion 24 is attached so that the lot rod 22 can rotate freely, and a connection portion for connecting one end of the lubricating water supply hose protrudes and is arranged. As an example, the drilling bit tool 20 is driven by operating a drive switch via the power supply device 40. Also, when the drilling bit tool 20 is driven, lubricating water is supplied from the lubricating water circulation device 50, and the operation proceeds while collecting sludge in which cutting powder and lubricating water are mixed.

[0012] As shown in FIGS. 4 and 5, as an example, the bit 23 has an outer diameter of 25 mm or less, and here, it will be described with an outer diameter of 15.5 mm. The bit 23 has a bit flow path 23a for supplying lubricating water to the tip side substantially at the center, penetrating through the center. Further, the bit 23 has an arc-shaped notch groove 23b in a part of the cylindrical body. Furthermore, the bit 23 is provided with a screw receiving portion 23c for connecting to the lot bar 22 on the rear side thereof. The bit 23 is used with the lot bar 22 connected to the screw receiving portion 23c.

[0013] The lot bar 22 is connected between the bit 23 and the output shaft 21a corresponding to the drilling depth. The lot bar 22 includes a cylindrical lot body 22a, a screw receiving portion 22b formed inside the lot body 22a for connecting to the output shaft 21a of the electric drive motor 21 which is a drive portion or another lot bar 22 on one end side of the lot body 22a, a screw portion 22c having an outer diameter smaller than the outer diameter of the lot body 22a on the other end side of the lot body 22a, a wrench operation portion 22d having a plane parallel to each other on the outer peripheral surface of the lot body 22a, and a flow path 22e for lubricating water penetrating in the longitudinal direction of the lot bar 22.

[0014] Note that the wrench operation portion 22d has a plane parallel formed inside the outer diameter of the lot body 22a. This wrench operation portion 22d is a portion used when an operator externally rotates the lot bar 22 with a tool such as a wrench for attachment or removal operations. The wrench operation portion 22d is not limited in its position, the shape of the plane, the size, or the number of planes as long as it is inside the outer diameter range of the lot body 22a and inside the outer diameter of the lot body 22a. Also, the flow path 22e formed inside the lot bar 22 has an inner diameter of 2.1 mm with respect to the outer diameter of the lot body 22a of 8.7 mm or 15 mm. This flow path 22e is formed so as to have an inner diameter in the range of 14% or more and 30.9% or less with respect to the outer diameter of the lot body 22a.

[0015] The outer diameter of the rod 22 is formed to be 98% or less and 95% or more of the outer diameter of the bit 23. When the outer diameter of the bit 23 is 25 mm or less and the rod 22 with a small outer diameter is used, if it is connected to a length exceeding 1 m to 2 m, it is likely to vibrate. Therefore, it has been found that vibration can be suppressed by adjusting the outer diameter of the rod 22 to a range where vibration is less likely to occur with respect to the outer diameter of the bit 23. Further, for the rod 22, it is necessary to form a drainage channel between the outside of the rod body 22a and the inner peripheral surface of the drilling for the sludge in which the chips cut by the bit 23 and the lubricating water are mixed. Therefore, the outer diameter of the rod 22 needs to be suppressed to a size that can smoothly discharge the sludge. Here, the outer diameter of the rod 22 is set to 98% or less with respect to the outer diameter of the bit 23 to secure a drainage channel for the sludge, and further, by setting it to 95% or more with respect to the outer diameter of the bit 23, vibration due to resonance is suppressed.

[0016] Considering vibration suppression and drainage channels, it is preferable that the outer diameter of the rod 22 be 98% or less and 95% or more with respect to the outer diameter of the bit 23. Further, it is more preferable that the outer diameter of the rod 22 be 98% or less and 95.5% or more with respect to the outer diameter of the bit 23, and it is even more preferable that it be 97.5% or less and 95.5% or more. As an example, the length of one rod 22 is 200 mm, and it is configured to be extendable so that deep drilling can be performed. In the drilling bit tool 20, since the outer diameter of the rod 22 is close to the diameter of the drilled hole, the rod 22 serves as a guide, and for example, it is possible to drill linearly at 1 m or more, 3 m or more, 5 m or more, 10 m or more, 15 m or more.

[0017] <Guide mechanism> The guide mechanism 10 is for reducing the deviation at the start of hole drilling. The guide mechanism 10 includes a fixing base 1 that is detachably vacuum-sucked to the installation surface adjacent to the bit 23 of the drilling bit tool 20, an angle adjustment mechanism 2 provided on the fixing base 1, a support column 7 disposed with the angle adjustment mechanism 2 and supported via a rotation support shaft 4, a slide block 8 slidably installed along the support column 7, and a mounting support portion 9 detachably attached to the slide block 8 and supporting the drilling bit tool 20.

[0018] As shown in FIGS. 1 and 3, the fixing base 1 is for stably installing a guide portion 11 that guides the support column 7 of the guide mechanism 10 and the drilling bit tool 20 on the installation surface W. This fixing base 1 is configured to be detachably fixed to the installation surface W by a vacuum pump 30, for example. The fixing base 1 is formed to have a space inside, and an elastic member such as rubber is disposed at a portion that contacts the installation surface W.

[0019] The angle adjustment mechanism 2 is for inclining and supporting the angle of the support column 7 within a preset range. The angle adjustment mechanism 2 is arranged such that an angle adjustment shaft 5 is inserted into an angle adjustment hole 6 formed in an angle adjustment plate 3. The angle adjustment hole 6 is formed as an arc-shaped long hole through which the angle adjustment shaft 5 can move when the support column 7 is at a predetermined angle. Further, the angle adjustment shaft 5 is fixed at the moving position by a nut or the like so that it can move within the range of the angle adjustment hole 6 and be fixed at a predetermined position, and thus the support column 7 can be installed at a predetermined angle.

[0020] The support column 7 is detachably attached to the fixing base 1 with screws to a base that is tiltably attached by a rotation support shaft 4. Further, the support column 7 has the angle adjustment mechanism 2 on the fixing base 1 side and is disposed to be tiltable within a predetermined angle range via the rotation support shaft 4. When the support column is attached to the fixing base 1, it is attached via screws to a long hole so that the position of the support column 7 can be adjusted by moving within the range of the long hole. The support column 7 is formed in a column shape with metal, for example, and here, as an example, it is installed to be longer than the length of one lot bar 22 and shorter than the length of two lot bars 22.

[0021] The support column 7 supports the slide block 8 so that it can move freely along the longitudinal direction. Further, a rotatable support column 7a that can rotate in the circumferential direction around the longitudinal direction of the support column is arranged on one end side of the support column 7. Therefore, by moving and holding the slide block 8 to the position of the rotatable support column 7a and rotating the rotatable support column 7a by 90 degrees, the space above the lot bar 22 used for drilling can be opened up. Therefore, by operating the rotatable support column 7a to open up the space above the drilled lot bar 22, the operator can easily pull up and remove the lot bar 22 and the bit 23 located in the concrete (see Fig. 8(b)). Further, it is preferable that this support column 7 is configured to be able to adjust the column length by connecting to the position where the rotatable support column 7a is connected. The support column 7 and the rotatable support column 7a are here formed with a rectangular cross-section, and a rack of a rack and pinion is formed along the longitudinal direction on one side of the rectangle.

[0022] As shown in Figs. 1 to 3, the slide block 8 includes a block body 8A that is inserted into the support column 7, a rotary handle 8B that is provided on the side surface of the block body 8A and rotatably supports and operates a pinion that meshes with the rack of the support column 7 inside the block body 8A, an operation handle 8C that is provided on the rear side of the block body 8A and moves the block body 8A up and down along the support column 7, and a mounting support portion 9 that is provided on the front side of the block body 8A and is equipped with the mounting support portion 9 of the drilling bit tool 20.

[0023] The mounting support portion 9 is for detachably fixing the drilling bit tool 20. As an example, the mounting support portion 9 has an annular portion that inserts the tip side of the drilling bit tool 20 and faces the flange portion formed on the body portion of the drilling bit tool 20. And the mounting support portion 9 is configured to fix the drilling bit tool 20 by screwing a screw that passes through the flange portion of the drilling bit tool 20 into a screw hole provided in the annular portion.

[0024] As shown in FIGS. 1 and 3, the guide part 11 includes a guide annular part 12 installed on the mounting support part, a guide rod 13 whose upper end is engaged with the guide annular part 12 and is arranged at intervals on the left and right of the lot rod 22 along the lot rod 22, a coil spring 14 wound around each of the guide rods 13, and a holding part 15 that supports the lower end side of the guide rod 13 and inserts and guides the lot rod 22. Further, below the guide part 11, a bush holder 16 and a contact pad 17 are arranged.

[0025] The guide rod 13 is installed along the lot rod 22 of the drilling bit tool 20 at a certain distance on the left and right of the lot rod 22. The upper end side of the guide rod 13 is slidably engaged with linear bushes 12A, 12A provided on the left and right of the guide annular part 12, and the lower end side is supported by the holding part 15. A coil spring 14 is wound around the guide rod 13 and is provided so as to always urge the linear bushes 12A, 12A downward between the linear bushes 12A, 12A and the holding part 15. Therefore, the bit 23 is always in a state of being urged in the drilling direction.

[0026] The holding part 15 has a shape in which the center is recessed downward to form a recess, and flat parts are formed on the left and right of the recess via steps. Further, a through hole is formed in the center of the recess of the holding part 15. And a cylindrical bush (not shown) is installed on the upper side of the holding part 15 so as to communicate with the through hole, and a bush holder 16 is installed on the lower side corresponding to the bush. The bush, the illustration of which is omitted, is configured to insert and rotatably guide the lot rod 22 and prevent the outflow of sludge.

[0027] The bush holder 16 is formed in a cylindrical shape, is rotatably inserted with the lot bar 22, and is formed so that the contact pad 17 can be detachably attached from one open end side of the cylinder. This bush holder 16 has a connection part 16d of the recovery hose 52 for recovering sludge. Note that the contact pad 17 is detachably attached from one open end side of the cylindrical bush holder 16 and abuts on the drilling start surface that drills through the lot bar 22.

[0028] The contact pad 17 is detachably installed on the bush holder 16 by inserting the lot bar 22 and the bit 23, and is a member for recovering sludge generated by cutting concrete with the bit 23 without water leakage. The contact pad 17, for example, is formed of an elastic member such as rubber, synthetic rubber, CR sponge, silicone rubber, etc., and preferably has a shore hardness in the range of 20 to 30. Note that when the contact pad 17 is drilled with a set inclination angle with respect to the drilling surface, a pad with a tip inclined along the inclination angle is used.

[0029] The vacuum pump 30 is for fixing the guide mechanism 10 to the installation surface W. By operating this vacuum pump 30, the fixing base 1 can be fixed by vacuum-sucking it to the installation surface W. The power supply device 40 operates the drilling bit tool 20, the vacuum pump 30, the lubricating water circulation device 50, the dust collection drive unit 60, etc. As the power supply device 40, a general one used when operating this type of tool etc. can be used. Note that the dust collection drive unit 60 recovers sludge from the recovery hose, for example, by making the air in the lubricating water circulation device 50 into a negative pressure. The dust collection drive unit 60 collects sludge by arranging an electric suction pump inside the housing of the lubricating water circulation device 50. Note that when it is a configuration in which an ejector is used to form an air flow inside the housing for dust collection, a compressor may be used.

[0030] The lubricating water circulation device 50 sends the supplied lubricating water to the tip side of the drilling through the flow path 22e inside the lot bar 22, and collects the sludge that is collected through the drainage flow path that becomes the gap between the outside of the lot bar 22 and the inner peripheral surface of the drilled hole, filters it with the filter F, and supplies it again. This lubricating water circulation device 50 includes a housing, a pump (vacuum pump or ejector) provided in the housing for collecting sludge, a supply pump provided in the housing for supplying lubricating water, a filter provided in the housing for filtering sludge, and a storage section for storing the lubricating water filtered by the filter. Then, the lubricating water circulation device 50 supplies the lubricating water in the storage section to the lot bar 22 side via the supply hose 51, and collects the sludge via the recovery hose 52. Further, it is preferable that the lubricating water circulation device 50 is provided with a foam blocking mechanism 70 that blocks the foam generated from the filter F before it reaches the dust collection driving section 60 side. The foam blocking mechanism 70 has a configuration such as arranging a mesh-like scrubbing brush in the space up to the dust collection driving section 60, for example, and can block the foam by bursting it.

[0031] An example of drilling concrete using the drilling bit tool 20 having the configuration described above will be described with reference to FIGS. 6(a) to 8(b). In FIG. 7(a), the bush holder 16 and the contact pad 17 are shown, and the configuration of the guide section 11 (guide annular section 12, guide rod 13, coil spring 14, holding section 15) is omitted. In FIGS. 7(b), (c), 8(a), and (b), the bush holder 16, the contact pad 17, and the configuration of the guide section 11 are omitted and shown. As shown in FIG. 6(a), first, the fixing base 1 is adsorbed and fixed using the vacuum pump 30 at a position adjacent to the drilling position on the installation surface W of the concrete to be drilled. Next, as shown in FIG. 6(b), the support column 7 is attached to the fixing base 1 and screwed. Subsequently, the drilling bit tool 20 is slidably arranged on the support column 7 by the slide block 8 and the mounting support section 9. As shown in FIG. 6(c), a centering rod Sb with a pointed tip is attached to the drilling bit tool 20. Then, the position of the support column 7 is adjusted so that the tip of the centering rod aligns with the drilling position. The support column 7 is attached to the fixing base 1 with screws and can move within the range of the long hole, so the position is adjusted within that range.

[0032] As shown in FIG. 7(a), remove the centering rod of the drilling bit tool 20, and attach the lot rod 22 and the bit 23 connected to the lot rod 22 to the drilling bit tool 20. Then, connect the supply hose 51 of the lubricating water circulation device 50 to the water injection part 24, and connect the recovery hose 52 to the bush holder 16. In this state, start the drilling operation while operating the lubricating water circulation device 50 to supply lubricating water, recover and filter the sludge, and proceed with the operation while circulating the lubricating water. Specifically, in the drilling operation, lubricating water is supplied from the flow path 22e of the lot rod 22 to the cutting position through the bit flow path 23a of the bit 23. Note that in FIGS. 7(b), 7(c), 8(a), and 8(b), the description of the lubricating water circulation device 50 and the like is omitted.

[0033] Furthermore, the sludge in which the cutting powder and the lubricating water are mixed by the bit 23 cutting the concrete is recovered by a recovery hose connected to the bush holder 16 through the drainage flow paths on the outer periphery of the lot rod 22 and the inner periphery of the hole being drilled, and is recovered to the filter in the lubricating water circulation device 50. In the drilling operation, when the range that can be drilled by the length of one lot rod 22 is completed, as shown in FIG. 7(b), once stop the drive of the drilling bit tool 20, leave the lot rod 22 and the bit 23 in the hole being drilled, disconnect the connection between the lot rod 22 and the drilling bit tool 20, and connect the additional lot rod 22. Then, as shown in FIG. 7(c) again, perform the drilling operation. By repeating such an operation, the lot rod 22 can be added and the hole can be drilled deeper.

[0034] Note that, as shown in Fig. 8(a), when the length of the drill rod 22 exceeds the range of 1 m to 2 m, the vibration of the rotation of the bit 23 is likely to be transmitted to the drill rod 22 and resonate easily. However, by setting the outer diameter of the drill rod 22 to be 98% or less and 95% or more with respect to the outer diameter of the bit 23, the vibration of the drill rod 22 can be suppressed and the drilling operation can be carried out efficiently. Also, since the outer diameter of the drill rod is 98% or less, a drainage channel for sludge can be secured, and the drilling operation can proceed smoothly, and the filtration and circulation of lubricating water can be appropriately performed. Furthermore, when the drilling operation is completed, the slide block 8 is moved to the position of the rotating support column 7a and held, and the rotating support column 7a is rotated by 90 degrees. Therefore, the drilling bit tool 20 can be moved, and the space above the drill rod 22 used for drilling can be vacated. Thus, by vacating the space above the drilled drill rod 22 by the operation of the rotating support column 7a, the operator can easily pull up and remove the drill rod 22 and the bit 23 located in the concrete.

[0035] In addition to performing vertical drilling from the installation surface W of the concrete, drilling operations can also be carried out in a direction inclined at a predetermined angle with respect to the vertical direction of the concrete. When performing the drilling operation with an inclined angle, it is preferable to use a contact pad 17 interposed between the bush holder 16 and the concrete surface and having a tip side formed at the inclined angle. In the case of a contact pad having an inclined surface at the tip, if the inclined angle of the inclined hole to be drilled is in the range of 10 to 45 degrees (see Fig. 2(b)), sludge and water leakage generated during drilling can be appropriately collected without occurring from the portion of the contact pad 17.

[0036] Furthermore, as shown in FIGS. 9 and 10, the percussion bit tool 20A may be configured such that the shank 22A is formed corresponding to the outer diameter of the connection portion of the drive motor in the first one where the lot bar 22 is connected to the connection portion of the drive motor. Although the configuration of the shank 22A is different from that already described, other configurations such as other lot bars 22 are the same. That is, the shank 22A includes a lot body 22a, a screw receiving portion 22b1 formed at one end side of the lot body 22a, a wrench operating portion 22d1 disposed adjacent to the screw receiving portion 22b1, a screw portion 22c that connects to another lot bar 22 or bit 23 at the other end of the lot body 22a, and a lubricating water flow path 22e that penetrates in the longitudinal direction of the shank 22A.

[0037] The shank 22A is used when changing the size of the lot bar 22 according to the outer diameter of the bit 23 to be drilled. When the outer diameter of the bit 23 changes, the lot bar 22 is connected via the shank 22A in order to adjust the screw portion connected to the percussion bit tool 20A and the screw portion connected to the bit. Note that the lot body 22a of the shank 22A has the same configuration as the lot bar 22 having the configuration already described. Also, the bit 23 or other lot bar 22 connected to the shank 22A has the same configuration as the configuration already described.

[0038] Furthermore, as shown in FIG. 11, the lot bar 22B may be configured such that a spiral groove 22f is formed on the outer peripheral surface of the lot body 22a2. As an example, the spiral groove 22f is formed with a groove width of 3.5 mm or more and 5.3 mm or less, a groove depth of 0.45 mm or more and 0.55 mm or less, a groove pitch of 18 mm or more and 22 mm or less, and an inclination angle with respect to the axial direction of 42 degrees or more and 47 degrees or less. Note that the outer diameter D2 of the lot body 22a2 is configured to be 98% or less and 95% or more, preferably 97.5% or less and 95.5% or more, and more preferably 97% or less and 96% or more, with respect to the outer diameter D1 of the bit 23, in the same manner as already described. Since the lot rod 22B has a spiral groove 22f in the lot body 22a2, it has the following advantages. That is, when drilling deeply downward by 15 m or the like, there may be a problem that sludge is not discharged in the suction operation of the dust collection drive unit 60. However, by providing a spiral groove 22f like the lot rod 22B, since the lot rod 22 also rotates due to the rotation of the bit 23, it becomes possible to lift the sludge through the spiral groove 22f by the rotation.

Example

[0039] Next, a specific example actually tested in which the outer diameter of the lot rod 22 is in the range of 98% or less and 95% or more with respect to the outer diameter of the bit 23 according to the present invention will be described below. Of course, the lot rod 22 used in the drilling bit tool 20 according to the present invention is not limited to this specific example. The guide mechanism 10, the drilling bit tool 20, and the lubricating water circulation device 50 use configurations equivalent to those shown in FIG. 1.

[0040] More specifically, Basic base equipment (guide mechanism): TS-092 (manufactured by Shibuya Corporation) Support column of the guide mechanism: 40 cm (manufactured by Shibuya Corporation) Fixed base of the guide mechanism: Vacuum pad (manufactured by Shibuya Corporation) Bush holder: LBD lightweight bush holder (manufactured by Kure Eisei Co., Ltd.) φ16 slide part: Linear bush (manufactured by Kure Eisei Co., Ltd.)

[0041] Plate: Use a plate for vacuum pad Drilling bit tool: (manufactured by Kure Eisei Co., Ltd.) Bit: Outer diameter of 15.5 mm, outer diameter of 9 mm (manufactured by Kure Eisei Co., Ltd.) Lot rod: Made of steel, outer diameter of 15 mm, outer diameter of 14.5 mm, outer diameter of 8.5 mm, outer diameter of 8.6 mm, outer diameter of 8.7 mm (manufactured by Kure Eisei Co., Ltd.) Lubricating water circulation device: (manufactured by Kure Eisei Co., Ltd.) Vacuum pump V-300: (manufactured by Shibuya Corporation) Power supply device: (manufactured by Kure Ei Seisakusho Co., Ltd.)

[0042] Using each of the above components, a lubricating water circulation drilling system was used to connect a lot rod to the bit by more than 1 m, and the drilling operation was performed on a concrete block at a rotational speed of the drilling bit tool of about 9,000 revolutions per minute. It was tested whether drilling became impossible due to vibration or whether a drainage channel for sludge was secured. The bit used the following two configurations. No1B with an outer diameter of φ15.5 (15.5 mm) No2B with an outer diameter of φ9 (9 mm)

[0043] The lot rod was made of S45C (JIS standard), S45C: JIS G4051 carbon steel for machine structures (SUJ2: JIS G4805 high-carbon chromium bearing steel), and those with a Rockwell hardness in the range of 40 to 46 (40 - 46 HrC) were used. The lot rods used had the following six outer diameters. No1R with an outer diameter of φ15 (15 mm) No2R with an outer diameter of φ14.8 (14.8 mm) No3R with an outer diameter of φ14.5 (14.5 mm) No4R with an outer diameter of φ8.7 (8.7 mm) No5R with an outer diameter of φ8.6 (8.6 mm) No6R with an outer diameter of φ8.5 (8.5 mm)

[0044] Evaluation of the outer diameter of the lot rod with respect to the outer diameter of the bit [Test result 1] = (〇) Combination of No1B and No1R (lot rod diameter 96.8% with respect to bit diameter) Vibration disappeared and it was confirmed that a drainage channel for sludge was secured. [Test result 2] = (〇) Combination of No1B and No2R (lot rod diameter 95.5% with respect to bit diameter) Vibration disappeared and it was confirmed that a drainage channel for sludge was secured. [Test result 3] = (×) Combination of No1B and No3R (Lot bar diameter 93.5% of bit diameter) Vibration occurred due to resonance and drilling became impossible.

[0045] [Test result 4] = (〇) Combination of No2B and No4R (Lot bar diameter 96.7% of bit diameter) Vibration disappeared and ensuring the drainage channel for sludge was also confirmed. [Test result 5] = (〇) Combination of No2B and No5R (Lot bar diameter 95.6% of bit diameter) Vibration disappeared and ensuring the drainage channel for sludge was also confirmed. [Test result 6] = (×) Combination of No2B and No6R (Lot bar diameter 94.4% of bit diameter) Vibration occurred due to resonance and drilling became impossible.

[0046] Based on the results of such tests, vibrations due to resonance were suppressed in test results 1, 2, 4, and 5, and the drainage channels for sludge were also ensured. In test results 3 and 6, vibrations due to resonance could not be suppressed. Therefore, it was found that when the outer diameter of the lot bar is 95% or more and 98% or less of the outer diameter of the bit, it is possible to suppress vibrations due to resonance and ensure the drainage channels for sludge. Note that the outer diameter of the lot bar is preferably 95.5% or more and 98% or less of the outer diameter of the bit, more preferably 95.5% or more and 97.5% or less, and even more preferably 96 or more and 97% or less.

[0047] As described above, the lubricating water circulation drilling system 100 performs drilling work by adjusting the drilling angle using the drill bit tool 20 using the guide mechanism 10 while circulating lubricating water through the lubricating water circulation device 50, and can drill holes of 1 to 2 m or more, 3 m or more, 5 m or more, or 10 m or more in concrete structures such as buildings, civil engineering structures such as bridges, etc., to inspect the condition of the internal structure, check for repair work for cracks, etc., or perform piping work such as checking the location of pipes that carry wiring and electric wires used in the new installation or expansion of various communication equipment in buildings, etc. The drilling machine according to the embodiment of the present invention has been described in detail above. The embodiments shown in the drawings are each a specific embodiment for carrying out the present invention. The technical scope of the present invention should not be construed as being limited thereby. do. [Explanation of symbols]

[0048] 1 Fixed base 2 Angle adjustment mechanism 3 Angle adjustment plate 5 Angle adjustment axis 6 Angle adjustment hole 7 pillars 8 Slide Block 8A Block body 8B Rotating handle 8C Operating handle 9 Mounting support 10 Guide mechanism 11 Information Department 12 Guide ring 12A Linear Bush 13 Guide rod 14 Coil spring 15 Holding part 16 Bush holder 17 Contact Pad 20 Drilling bit tool 20A drilling bit tool 21 Electric drive motor 21a Output shaft 22b1 Screw receiving part 22a2 Lot body 22 Lot bar 22A Shank 22B Lot bar 22a Lot body 22b Screw receiving part 22c Threaded part 22d Wrench operating part 22d1 Wrench operating part 22e Flow path 22f Groove 23 Bit 23a Bit flow path 23b Groove 23c Screw receiving part 24 Water injection part 30 Vacuum pump 40 Power supply device 50 Lubricating water circulation device 51 Supply hose 52 Recovery hose 60 Dust collection drive part 70 Bubble cut-off mechanism 100 Lubricating water circulation perforation system D1 Outer diameter of bit D2 Outer diameter of lot bar W Installation surface

Claims

1. A bit for piercing a workpiece, a chuck bar detachably connected to the bit and having a flow path for lubricating water inside a cylindrical shape, and the chuck bar is connected to and supported by another said chuck bar, and a drive unit for rotating the bit by rotating the chuck bar. In a piercing bit tool comprising: The outer diameter of the bit is 25 mm or less, A piercing bit tool in which the outer diameter of the chuck bar is 98% or less and 95% or more of the outer diameter of the bit.

2. The piercing bit tool according to claim 1, wherein the outer diameter of the chuck bar is 97.5% or less and 95.5% or more of the outer diameter of the bit.

3. The piercing bit tool according to claim 1, wherein the outer diameter of the chuck bar is 97% or less and 96% or more of the outer diameter of the bit.

4. The piercing bit tool according to claim 1, having a shank interposed between the drive unit and the chuck bar.

5. The chuck bar includes a cylindrical chuck body, a screw receiving portion formed inside the chuck body at one end of the chuck body and engaging with a screw portion of another said chuck bar or the drive unit, and at the other end of the chuck body, formed for connection to another said chuck bar, a screw portion smaller than the outer diameter of the chuck body, and a wrench operation portion on the outer peripheral surface of the chuck body that becomes a surface parallel to each other. The piercing bit tool according to claim 1.

6. The chuck body has a spiral groove on the circumferential surface, The groove is formed with a groove width of 3.5 mm or more and 5.3 mm or less, a groove depth of 0.45 mm or more and 0.55 mm or less, a groove pitch of 18 mm or more and 22 mm or less, and an inclination angle with respect to the axial direction of 42 degrees or more and 47 degrees or less. The piercing bit tool according to claim 5, wherein the wrench operation portion is disposed between the chuck body and the screw receiving portion.

7. A lubricating water circulation piercing system comprising: the piercing bit tool according to any one of claims 1 to 6, a guide mechanism arranged parallel to the chuck bar of the piercing bit tool and linearly guiding the piercing bit tool, and lubricating water is supplied to the tip side of the bit through the flow path in the chuck bar, and chips generated during piercing and sludge in which the lubricating water is mixed are collected and filtered through a bush holder inserted and attached to the piercing start surface of the workpiece, and circulated as the lubricating water. The guide mechanism includes a fixing base fixed to the object to be perforated, a linear support column continuous with the front fixing base, a slide block slidably attached to the support column, and a mounting support portion removably attached to the slide block for supporting the perforating bit tool. The support column is not less than the length of one of the connected lot rods and not more than the length of two of the lot rods. The lubricating water circulation device is a lubricating water circulation perforation system including a water storage tank disposed in a housing for storing the lubricating water, a supply pump for supplying the lubricating water in the water storage tank to the lot rod via a supply hose, and a dust collection driving portion for collecting the sludge from the bush holder into a filtration filter disposed in the housing via a dust collection hose.

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