JP2002337133A - Perforating apparatus and perforating tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perforating apparatus which can suppress a vibration at the time of rapid rotation by matching an axis of a perforating tool to a revolving axis and to provide the perforating tool. SOLUTION: The perforating apparatus 1 comprises a cylindrical core bit 13 having a bit 15 provided at a distal end, and a direct motor 2 for rotatably driving the bit 13. The motor 2 has a cylindrical rotor 17 having a rotational shaft 11 having the bit 13 mounted at the distal end and integrally provided through the rotor 17, and a cylindrical stator 18 provided on a peripheral surface of the rotor 17. The apparatus 1 further comprises an adapter 12 provided at the distal end of the shaft 11, an attaching/detaching part 13a provided at a base end side of the bit 13, and a protruding strip 12d and a recess 13e provided as axis matching parts at the adapter 12 and the part 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, when embedding a post-installed anchor or the like in a concrete structure, when drilling an annular hole at a high speed in an excavated object made of the concrete structure. And a particularly suitable perforation device.

[0002]

2. Description of the Related Art As a method of reinforcing an existing concrete wall, first, the wall is largely pierced, an iron brace is provided in the pierced opening, and then the brace and the opening are formed. There is a method of reinforcing an entire wall by solidifying an anchor provided on the inner peripheral surface with concrete. At this time, the anchor is provided by being accommodated in a hole provided on the inner peripheral surface of the opening. The hole for arranging the anchor has a core bit as a drilling tool having an annular bit made of diamond or a carbide tip at the tip of a cylindrical tool body, and a hole for rotating the core bit around an axis. It is formed by a piercing device provided with a motor. In other words, the concrete is perforated by rotating and pressing the bit against the concrete to be excavated, thereby forming a cylindrical core. Then, the root of the core core remaining inside the concrete is broken, and then the core core is pulled out to form a hole for arranging the anchor. As such a drilling device, a DC type motor capable of high-speed rotation is used, and a core bit is directly attached to the tip of the rotation shaft of the motor, and the bit is rotated at high speed without lowering the rotation speed of the motor by gears, etc. Attempts have been made to reduce the amount of work required for excavation and increase the drilling speed while reducing the amount of cutting into the excavated object.

[0003]

However, in order to increase the drilling speed while reducing the amount of cutting into the object to be excavated, the peripheral speed of the bit must be at least 250 m / min. Then, in order to obtain this peripheral speed with a core bit having a diameter of, for example, about 20 mm necessary for drilling a hole for accommodating the anchor, the core bit must be rotated at 4000 rpm or more. Since a core bit used in a normal drilling machine is used at 2000 rpm or less, even if the core bit is attached to a rotating shaft with a screw or the like, there is no problem in moving balance. However, it is difficult to keep the axis of the core bit and the axis of rotation within a gap of about several μm by simply attaching the core bit as it is with screws or the like. At a high rotation speed of 4000 to 10000 rpm, vibration during rotation is poor due to poor motion balance. This causes a problem that the drilling speed is reduced.

[0004] The present invention has been made in view of the above circumstances, and provides a drilling device and a drilling tool that can suppress vibration during high-speed rotation by aligning the axis of the drilling tool with the rotation axis. It is in.

[0005]

In order to achieve the above object, the present invention employs the following constitution. That is, a drilling tool which is formed in a cylindrical shape and is provided with a bit for drilling an object to be excavated at a tip thereof, is driven to rotate around an axis, and is sent to the tip side in the axial direction, and a motor which rotationally drives the drilling tool The motor includes: a cylindrical rotor provided integrally with a rotary shaft through which the drilling tool is attached at a tip; and a cylindrical stator provided on an outer peripheral surface of the rotor. A drilling device configured to rotate the rotary shaft around an axis, wherein a mounting portion for mounting the drilling tool is provided at a tip of the rotary shaft, and a base end of the drilling tool is provided at a base end of the drilling tool. A detachable portion detachably attached to the attaching portion is provided, and a mounting surface is formed on a distal end side of the attaching portion facing the detachable portion, while a base end side of the detachable portion is Attach to mounting part An attachment / detachment surface capable of contacting the attachment surface is formed, and each of the attachment surface and the attachment / detachment surface is formed along the axial direction, and the axis of the rotating shaft and the axis of the drilling tool are formed. An axial alignment portion is formed which can be fitted to each other in the axial direction in the aligned state, and which restricts the movement of the drilling tool in a direction intersecting with the axial direction in the fitted state.

[0006] With this configuration, the drilling tool can be attached to the distal end of the rotary shaft by attaching the detachable portion on the base end side of the drilling tool to the mounting portion on the distal end side of the rotary shaft. When mounting the drilling tool, the drilling tool is mounted while moving the drilling tool toward the tip of the rotating shaft along the axial direction. At this time, the axis aligning portions provided on each of the mounting surface and the attaching / detaching surface are fitted to each other so as to align the axis of the rotating shaft with the axis of the drilling tool while guiding the drilling tool, and the mounting surface and the attaching / detaching surface At the time of contact, the axis of the rotary shaft and the axis of the drilling tool are accurately matched. Thus, the axis of the drilling tool can be easily aligned with the rotation axis.

[0007] Each of the attaching portion and the attaching / detaching portion has a male screw portion in which the drilling tool is turned in a direction opposite to a direction in which the drilling tool is rotationally driven around the axis and screwed together. A female screw portion may be formed, and the axis alignment portion may be formed in a circumferential direction.

With this configuration, not only can the drilling tool be easily attached to and detached from the rotary shaft from the screw, but also, when drilling, the male screw and the female screw are tightened by digging resistance. The mounting rigidity is improved, and vibration during rotation can be suppressed. When screwing the attachment / detachment part to the attachment part, the drilling tool advances while rotating around the axis toward the rotation axis. At this time, the axially aligned portions formed in the circumferential direction are fitted to each other while rotating and guide the drilling tool, so that the axis of the rotating shaft and the axis of the drilling tool can be accurately matched. Thus, the axis of the drilling tool can be easily aligned with the rotation axis.

[0009] The axis aligning portion may have a configuration in which the mounting surface and the mounting / removing surface each have a ridge formed in a circumferential direction and a concave portion in which the ridge is fitted.

[0010] In this case, the side surface of the ridge formed concentrically along the axial direction is aligned with the side surface of the concentric concave portion formed along the axial direction, so that the axis of the drilling tool and the axis of the drilling tool are aligned. The rotation axis is exactly matched.

[0011] Further, the axis aligning portion may have a tapered surface on each of the mounting surface and the mounting / removing surface, wherein the mounting surface and the mounting / removing surface are in contact with each other and are in close contact with each other.

With such a configuration, the drilling tool is guided to the tapered surfaces that are in close contact with each other, and the axis of the drilling tool and the rotation axis can be more accurately matched. Here, the tapered surface may be formed over the entire surface of the mounting surface and the removable surface, or may be formed on a part thereof. Further, it may be formed on a part of the axis alignment portion formed by the ridge and the concave portion.

Further, the female screw portion may be formed in the mounting portion. With this configuration,
Since the screw part does not become exposed to the outside,
When replacing the drilling tool, even if the drilling tool is removed and the mounting part is left in a dusty atmosphere such as cutting chips, it prevents dust from adhering to the screw part and a new drilling tool is attached In addition, it is possible to reduce the situation where the screw portion of the drilling tool bites.

[0014] The mounting portion may be provided detachably on the rotating shaft. With such a configuration, even when the axis of the rotating shaft does not coincide with the rotating axis, the axis of the mounting portion can be accurately matched with the rotating axis, and the axis of the drilling tool is aligned with the axis of the mounting portion. The alignment allows the axis of the drilling tool to coincide with the axis of rotation.

The present invention also includes a cylindrical rotor provided integrally with a rotary shaft penetrating therethrough, and a cylindrical stator provided on the outer peripheral surface of the rotor. A drilling tool attached to the tip of the rotating shaft of a motor configured to rotate in the direction of the axis, and driven to rotate around the axis and sent to the tip side in the axial direction. A bit for drilling an excavated object is provided at the distal end, and a detachable portion is provided at the proximal end so as to be detachably attached to an attaching portion provided at the distal end of the rotating shaft. A detachable surface is formed which can be brought into contact with a mounting surface formed on the distal end side of the mounting portion facing the mounting portion, and an axial alignment portion is formed along the axial direction on the removable surface, The axis aligning portion includes the axis line on the mounting surface. A direction in which the axis of the rotary shaft and the axis of the drilling tool are aligned with each other, and intersects with the axis in the fitted state. The drilling tool is formed so as to restrict the movement of the drilling tool.

With this configuration, the drilling tool can be attached to the distal end of the rotary shaft by attaching the detachable portion on the base end side of the drilling tool to the mounting portion on the distal end side of the rotary shaft. When mounting the drilling tool, the drilling tool is mounted while moving the drilling tool toward the tip of the rotating shaft along the axial direction. At this time, the axis aligning portions provided on each of the mounting surface and the attaching / detaching surface are fitted to each other so as to align the axis of the rotating shaft and the axis of the drilling tool while guiding the drilling tool, and the mounting surface and the attaching / detaching surface At the time of contact, the axis of the rotary shaft and the axis of the drilling tool are accurately matched. Thus, the axis of the drilling tool can be easily aligned with the rotation axis.

Further, the detachable portion has a threaded portion which is screwed into a threaded portion formed in the mounting portion in a direction opposite to a direction in which the attachment portion is driven to rotate about the axis. The joining portion may be formed over the circumferential direction.

With such a configuration, not only can the drilling tool be easily attached to and detached from the rotary shaft, but also the male screw portion and the female screw portion are tightened together with the drilling by excavation resistance, and the mounting rigidity of the drilling tool is increased. And vibration during rotation can be suppressed. When screwing the attachment / detachment part to the attachment part, the drilling tool advances while rotating around the axis toward the rotation axis. At this time, the axially aligned portions formed in the circumferential direction are fitted to each other while rotating and guide the drilling tool, so that the axis of the rotating shaft and the axis of the drilling tool can be accurately matched. Thus, the axis of the drilling tool can be easily aligned with the rotation axis.

The axial alignment portion formed on the attachment / detachment surface is a concave portion formed in the circumferential direction so as to fit into a ridge formed in the mounting surface in the circumferential direction as the axial alignment portion. May be.

In this case, the side surface of the ridge formed concentrically along the axial direction is aligned with the side surface of the concentric concave portion formed along the axial direction, so that the axis of the drilling tool is aligned with the axis of the piercing tool. The rotation axis is exactly matched.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a punching device according to the present invention will be described with reference to the drawings. 1 to 3 show an embodiment of a punching device according to the present invention. In FIG.
Is a punching device, and reference numeral 1a is a punching device main body, reference numeral 1b.
Is a power source, and reference numeral 2 is a motor (hereinafter, referred to as a direct motor) of the present embodiment which constitutes the punching apparatus main body 1a driven by the power source 1b. The punching device main body 1a is provided separately from the power supply 1b, and has a structure in which the direct motor 2 is supported on a support 4 erected on the base 3 via an up-down mechanism 41.
Thus, the direct motor 2 is moved along the column 4.

The direct motor 2 is a DC motor that rotates when a DC voltage is applied thereto. The direct motor 2 has a cylindrical rotating shaft 11 at the center thereof. ) Is detachably screwed into a screw portion 11a formed at the tip of the rotating shaft 11, and this adapter 12
A cylindrical core bit 13 (drilling tool) is detachably attached to the rotary shaft 11 so as to communicate with each other.

Here, the adapter 12 has a hollow and substantially cylindrical shape, and has a female screw portion 12a screwed to the screw portion 11a at the distal end of the rotating shaft 11 at the base end side, and a core bit 13 at the distal end side. A female screw portion 12 b to which a base end is attached is provided along the axis O direction of the rotating shaft 11. Here, the female screw portion 12a is formed in a direction in which the female screw portion 12a is fastened to the rotating shaft 11 by rotation during drilling. Adapter 1
2, a mounting surface 12c is formed facing the core bit 13 and a ridge 12d having a concentric side surface along the axis O direction is formed on the mounting surface 12c in the circumferential direction. ing.

The core bit 13 has a diameter of 20 to 2 mm.
At the tip of a hollow tube 14 formed in a cylindrical shape of 5 mm, a bit 15 made of a diamond bit is provided integrally in the circumferential direction. That is, the core bit 13 is provided with a cemented carbide,
Alternatively, there is provided a bit 15 made of a diamond tool in which super-abrasive grains (diamond abrasive grains or CBN abrasive grains) are hardened by a binder such as a metal bond or a resin bond. The core bit 13 is driven to rotate around the axis, and is sent to the front end side in the axial direction to excavate the concrete C (the object to be excavated) to form a columnar core. At the base end side of the core bit 13, a detachable portion 13a attached to the adapter 12 is provided.
Is provided. The adapter 1 is attached to the detachable portion 13a.
A male screw portion 13b screwed to the second female screw portion 12b is formed along the axis O 'of the core bit 13, and a flange is formed so as to extend outward from a position where the male screw portion 13b starts to be formed. The portion 13c is provided in a protruding manner. An attachment / detachment surface 13d is formed on the base end surface of the flange portion 13c so as to face the adapter 12 and contact the mounting surface 12c. Further, the axis of the core bit 13 is located at a position corresponding to the ridge 12d. Recess 13e having concentric side surfaces along O 'direction
Are formed in the circumferential direction. The flange 13c
A grip 13f is provided adjacent to the tip of the core bit 13 so that the core bit 13 can be gripped with a tool such as a wrench when the core bit 13 is attached to the adapter 12. Further, the male screw portion 13b is provided with the core bit 1 at the time of drilling.
By the rotation of 3, the core bit 13 is formed so as to be fastened to the adapter 12. The ridge 12d and the recess 13e are aligned with the axis O of the rotating shaft 11 and the core bit 1.
3 can be fitted to each other in the direction of the axis O in a state where they are aligned with the axis O ′ of the third axis, and serve as an axis aligning portion that restricts the movement of the core bit 13 in the direction intersecting with the direction of the axis O in the fitted state. I have.

As described above, the direct motor 2
Is a core bit 13 which is a tool directly connected to the rotating shaft 11.
Is a direct type motor that directly rotates without using a rotation transmission mechanism such as a gear, and is capable of rotating at 4000 to 9500 rpm. The direct motor 2 includes a rotor 17 in which a coil coated with a heat-resistant resin such as polyimide is wound in a housing 16, and a cylindrical stator 18 provided on an outer peripheral surface of the rotor 17 and having a permanent magnet. And a configuration including: Rotating shaft 11
Are inserted so as to be pressed into an insertion hole 17 a formed at the center of the rotor 17, and are integrally fixed to the rotor 17. Bearings 19a and 19b for rotatably supporting the rotor 12 are provided inside the upper wall 16a and the lower wall 16b of the housing 16, respectively. That is, the bearings 19a and 19b support the vicinity of the upper and lower ends of the rotating shaft 11 inserted into the center of the rotor 17, and act on the rotating shaft 11 and the rotor 17 through which the rotating shaft 11 is inserted. It is configured to be able to receive a thrust force and a radial force.

At the rear end of the direct motor 2, there is provided a rotating shaft support table 20 rotatably supporting a mechanical seal portion 38 rotatably and liquid-tightly connected to the rear end of the rotating shaft 11, An upper housing 21 fixed on the shaft support 20 and accommodating the rear end of the rotating shaft 11 is provided. The upper housing 21 is formed with a flow path 22 communicating with the through hole 11 a at the center of the rotating shaft 11, and the flow path 22 is opened on the side of the upper housing 21. A tube 24 is connected to the opening 23 opened to the side, and cooling water for wet excavation is sent from the tube 24. Then, the tube 24 passes through the flow path 22 of the upper housing 21 and passes through the through-hole 11
a, and then the adapter 1 is attached to the tip of the rotating shaft 11.
2 into core bits 13 connected via
The excavation point by the bit 15 is cooled. At the rear end of the upper housing 21, a mounting screw portion 31 is formed, and a cap 32 is screwed and fixed to the mounting screw portion 31. The cap 32 has an insertion hole 34 formed at the center thereof. The upper housing 21 is formed with a communication hole 35 communicating with the insertion hole 34 of the cap 32 and the through hole 11a of the rotating shaft 11. An extruding rod 36 is inserted into the through-hole 34, the through-hole 35 and the through-hole 11a which communicate with each other. An O-ring 37 is provided between the push rod 36 and the insertion hole 34 of the cap 32 and is sealed.

Reference numeral 25 denotes a brush portion disposed in the circumferential direction on the upper side of the housing 16 of the direct motor 2 so as to contact the rotating shaft 11. And a drive current is supplied.

A power supply 1b for supplying a direct current to the direct motor 2 has a power supply body 5, and further has a plug 5 for connecting the power supply body 5 to an AC source supplied to the work site.
1 is provided. Power supply body 5
In addition to the main switch 53, there is provided a current amount selection switch 54 for selecting an appropriate current amount according to the allowable current amount of the power supply on the input side. Although not shown here, the power supply body 5 is also provided with a switch for emergency stop of the drilling operation, a cooling water inlet for introducing cooling water for cooling the power supply, and the like.

A control unit 6 is provided in the drilling apparatus main body 1a. The control unit 6 includes a rotation speed adjusting knob 61 for adjusting the rotation speed of the direct motor 2, and a control of the rotation of the direct motor 2 at hand. A reset button 62 is provided to start and stop the motor at the same time, or to restart the rotation when the output voltage drops to zero due to the power supply interlock.

A cable 7 is provided between the punching device main body 1a and the power supply 1b. This cable 7
Two current supply lines (not shown) for supplying a direct current from the power supply 1b to the direct motor 2, a lead wire for controlling the power supply, a ground wire, and the like are bundled by a waterproof cover 74 having a waterproof property to form a single cable. When the punching device main body 1a is transported, a current supply line, a conductor for controlling a power supply, a ground line, and the like are configured to be integrally routed. Furthermore, the punching device main body 1a of the cable 7
At one end on the side, a multi-core perforation device main body connection portion 7a is provided so that a current supply line, a lead wire for controlling a power supply, a ground line, and the like are connected to the perforation device main body 1a in a watertight and integral manner.
At the other end on the power supply 1b side, a multi-core motor power supply connection portion 7b is provided so that a current supply line, a conductor for controlling the power supply, a ground line, and the like are connected to the power supply 1b in a watertight manner and integrally. . The waterproof cover 74 is attached to the perforation device main body connection portion 7a and the motor power supply connection portion 7b while maintaining watertightness.
The inner current supply line, the conductor for controlling the power supply, the ground wire, and the like are configured to be waterproof.

Next, the operation of the drilling device 1 having the above configuration and the drilling operation for the concrete C using the drilling device 1 will be described. First, the axis O ′ of the core bit 13 is aligned with the axis O of the rotating shaft 11, and the core bit 13 is rotated in a direction opposite to the direction of rotation of the core bit 13 during drilling.
Is screwed into the female screw portion 12b of the adapter 12. At this time, the core bit 13 advances toward the adapter 12 while rotating around the axis O, and the ridges 12d and the recesses 13e formed in the circumferential direction fit while rotating with each other. The core bit 13 is guided by aligning the side surface of the ridge 12d formed concentrically along the axis O direction with the side surface of the concentric concave portion 13e formed along the axis O 'direction. When the mounting surface 12c and the attaching / detaching surface 13d come into contact with each other, the axis O of the rotating shaft 11 and the axis O 'of the core bit 13 are accurately matched.

After the core bit 13 is attached to the rotating shaft 11, the direct motor 2 positioned above the support column 4 is moved to a predetermined drilling position in the concrete C and the rotating shaft 11 is rotated.
And the base 3 is fixed to the concrete C.

When the drilling machine main body 1a is installed on the concrete C, the drilling machine main body connecting portion 7a is connected to the drilling machine main body 1a, and the motor power supply connecting portion 7b is connected to the power source 1b. Are electrically connected by a cable 7. Main switch 53 of power supply 1b
Is set to the ON side, and the current amount selection switch 54 is set in accordance with the allowable current on the AC voltage supply side. Reset button 62
When a direct current voltage is applied to the brush 25 of the direct motor 2 to energize the coil of the rotor 17 (or the stator 18) to rotate the rotor 17 at a high speed of 4000 rpm or more, Cooling water is fed from a cooling water supply device (not shown) via a tube 24. The rotation speed at this time is controlled by turning a rotation speed adjustment knob 61 provided in the control unit 6.

In this state, the moving mechanism 41
By lowering the direct motor 2 by
The bit 15 of the core bit 13 rotating around the axis connected to the tip of the rotating shaft 11 is pressed against the surface of the concrete C. In this way, an annular hole H is formed in the concrete C by the bit 15 rotating at a high speed. If the bit 15 comes into contact with a hard reinforcing member such as a reinforcing bar for reinforcing the concrete C during such a drilling operation, and the rotation of the direct motor 2 is suddenly suppressed, the induced voltage suddenly decreases and the winding is reduced. Excessive current flows due to only the resistance. For this reason, the threshold value is appropriately set, and when the current value detected by the current detector 59 exceeds the threshold value, the triac control unit 58 immediately adjusts the firing angle of the gate current to adjust the phase control unit 56. Is set so that there is no output from. Thus, when the bit 15 comes into contact with a reinforcing member such as a reinforcing bar, the rotation of the direct motor 2 is immediately stopped, and the drilling operation is interrupted. Thus, when the interlock is activated and the drilling operation is interrupted, the drilling position is changed, and the operation is restarted without hitting the reinforcing bar. At this time, the reset button 62 is pressed to rotate the direct motor 2 again. During the drilling operation, even if cooling water is applied to the cable 7, since the waterproofness of the cable 7 is maintained, the inner current supply line,
The control line, ground line, etc. are isolated from water and do not cause a short circuit or short circuit. After the annular hole H is formed to a predetermined depth, the direct motor 2 is raised, the bit 15 is pulled out from the hole H, and the center core is removed to form an anchor hole.

When the bit 15 is pulled out of the hole H by raising the direct motor 2, the core bit 13
When the core remains inside, the extruding rod 36 is extruded to the tip side.

As described above, according to the present embodiment, by rotating the rotating shaft 11, the core bit 13 attached to the rotating shaft 11 is directly rotated without passing through a rotation transmitting mechanism such as a gear or a belt. Therefore, the transmission loss of the torque by the rotation transmission mechanism can be eliminated, the run-out of the rotating shaft 11 can be minimized, and the drilling device main body 1a itself can be reduced in size and weight. Thus, the handleability of the drilling device main body 1a can be improved, and the noise generated during the drilling operation can be reduced to a minimum.

That is, since the rotary shaft 11 is press-fitted into the insertion hole 17a formed at the center of the rotor 17 and is directly fixed and integrated, the overall rigidity can be greatly improved. The hole can be formed by rotating the core bit 13 at a high speed, and the drilling speed can be greatly increased as compared with the conventional case. Accordingly, the drilling operation can be performed quickly, and the construction period of various construction operations including the drilling operation can be shortened.

The noise can be greatly reduced (about 70 dB) as compared with the case where an engine, a hydraulic motor, or a geared motor that rotates a rotary shaft via a gear is used. Therefore, the labor required for the maintenance work can be significantly reduced.

The bit 1 at the tip of the core bit 13
5 is high speed (4000 rpm) by the direct motor 2 for directly applying a rotational force from the rotating shaft 11 to the core bit 13.
pm or more) and the peripheral speed of the bit 15 is 250
m / min or more. As described above, the rotation speed of the core bit 13 is set to the rotation speed obtained by the direct motor 2, and the rotation speed of the core bit 13 is increased by rotating the bit 15 at a high speed under a predetermined drilling speed. This means that the drilling depth, in other words, the depth of excavation of the bit 15 into the excavated object is reduced, and the resistance to excavation is reduced. The amount of decrease in resistance to excavation exceeds the amount of decrease in the torque generated by the direct motor 2, so that the drilling speed can be increased and the drilling time can be shortened. Thus, the perforation time can be reduced as compared with the case where the number of revolutions is reduced by using a gear or the like.

Further, by attaching and detaching the core bit 13 with the adapter 12, it is possible to easily exchange the core bit 13 with the core bit 13 having various diameters. This allows
Maintenance such as replacement of the core bit 13 can be easily performed, workability can be improved, and the core bit 13 can be replaced, so that one having bits 15 with various blade thicknesses and shapes can be selected. Can be used. At this time, a ridge 12d as an axis alignment portion provided on each of the mounting surface 12c and the attaching / detaching surface 13d.
The recess 13e and the recess 13e are fitted to each other while guiding the core bit 13, so that the axis O of the rotating shaft 11 and the axis O 'of the core bit 13 can be easily matched.

Since the movement of the core bit 13 once attached in the direction intersecting with the axis O is restricted by the axis aligning portion, the axis of the core bit 13 does not deviate from the rotation axis, and the motion balance is maintained well. Even when rotating at a high speed, no vibration or the like is generated, so that a reduction in the drilling speed can be suppressed.

Here, since the adapter 12 is screwed at the tip of the rotating shaft 11, even if the axis O of the rotating shaft 11 does not coincide with the rotating axis, the axis of the adapter 12 is accurately aligned with the rotating axis. Core bit 1
The axis O ′ of the core bit 13 can be made to coincide with the rotation axis by aligning the axis O ′ of the third with the axis of the adapter 12.

Further, the female screw portion 12 is provided on the adapter 12 side.
b, the female screw portion 12b is not exposed to the outside. Therefore, when the core bit is replaced, the core bit is removed and the adapter 12b is removed.
Even if left in an atmosphere with a lot of dust such as cutting chips, the adhesion of dust to the female screw portion 12b is suppressed, and when a new core bit is attached, the male screw portion of the core bit bites into the female screw portion, It is possible to reduce a situation in which the vehicle has an inclination.

In the present embodiment, the axial alignment portion is formed by the ridge 12d formed on the mounting surface 12c and the detachable surface 1d.
The recess 13e formed in 3d is used as the mounting surface 12c.
A recess may be formed in the circumferential direction in the peripheral portion, and a ridge fitted to the recess may be formed in the attaching / detaching surface 13d in the circumferential direction.

As shown in FIG. 4, a tapered surface is formed on the entire mounting surface 12c. The tapered surface is inclined toward the base end from the outside to the inside, and the tapered surface 13d corresponds to the tapered surface. The whole may be configured such that a tapered surface inclined toward the base end side from the outside toward the inside is formed. In this case, core bit 13
Are guided to the tapered surfaces in close contact with each other, so that the axis O ′ of the core bit 13 and the rotation axis can be more accurately matched.

Here, this tapered surface is attached to the mounting surface 12c.
And a part of the surface of the attachment / detachment surface 13d. For example, as shown in FIG. 5, the protrusion 12e and the recess 13g are formed on a part of the projection 12e and the recess 13g. The shape may have a mountain-shaped ridge.
The point is that the axis O 'of the core bit 13 and the rotation axis can be made to coincide with each other as long as the inclined surfaces that come into contact with each other are formed.

[0047]

The present invention has the following effects. According to the first aspect of the present invention, each of the mounting portion provided on the distal end side of the rotating shaft and the attaching / detaching portion provided on the proximal end side of the cylindrical drilling tool provided with the bit at the distal end include: A drilling tool that is formed along the axial direction, can be fitted to each other in the axial direction in a state where the axis of the rotating shaft and the axis of the drilling tool are aligned, and that intersects the axial direction in the fitted state. Is formed, the vibration of the drilling tool at the time of high-speed rotation can be suppressed by aligning the axis of the drilling tool with the rotation axis.

According to the second aspect of the present invention, the drilling tool is rotated in the direction opposite to the direction in which the drilling tool is rotationally driven around the axis, and is screwed into each of the mounting portion and the detachable portion. A male screw portion and a female screw portion to be combined are formed, and the axial alignment portion is formed in the circumferential direction. Therefore, at the time of drilling, the male screw portion and the female screw portion are tightened by excavation resistance, and the mounting rigidity of the drilling tool is set. And vibration during rotation can be suppressed. Further, the axis aligning portions are fitted to each other while rotating and guide the drilling tool, so that the axis of the rotating shaft and the axis of the drilling tool can be accurately matched.

According to the third aspect of the present invention, the axis aligning portion has, on each of the attachment surface and the attachment / detachment surface, a ridge formed in the circumferential direction and a concave portion into which the ridge is fitted. Therefore, the axis of the drilling tool and the rotation axis can be accurately matched.

According to the fourth aspect of the present invention, the axis aligning portion has a tapered surface on each of the mounting surface and the detachable surface where the mounting surface and the detachable surface come into contact with each other and come into close contact with each other. Therefore, the drilling tools are guided to the tapered surfaces that are in close contact with each other, and the axis of the drilling tool and the rotation axis can be more accurately matched.

According to the fifth aspect of the present invention, since the female screw portion is formed in the mounting portion, the adhesion of dust to the female screw portion is suppressed, and when a new drilling tool is mounted. Further, it is possible to reduce a situation in which the thread portion of the drilling tool bites.

According to the sixth aspect of the present invention, since the mounting portion is provided detachably on the rotary shaft, even when the axis of the rotary shaft does not coincide with the rotary axis, the mounting portion can be mounted on the rotary shaft. The axis can be made to exactly match the axis of rotation, and the axis of the drilling tool can be aligned with the axis of rotation by aligning the axis of the drilling tool with the axis of the mounting.

According to the seventh aspect of the present invention, vibration during high-speed rotation of the drilling tool can be suppressed by aligning the axis of the drilling tool with the axis of rotation.

According to the invention described in claim 8, at the time of drilling, the male screw portion and the female screw portion are tightened by digging resistance, the rigidity of the drilling tool is improved, and vibration during rotation is suppressed. Can be. Further, the axis aligning portions are fitted to each other while rotating and guide the drilling tool, so that the axis of the rotating shaft and the axis of the drilling tool can be accurately matched.

According to the ninth aspect of the present invention, the axis of the drilling tool and the rotation axis can be accurately matched.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention,
It is a side view which shows an example of a perforation apparatus.

FIG. 2 is a side view showing the punching device main body of the punching device in a partially cutaway view.

FIG. 3 is a diagram showing an embodiment according to the present invention,
It is a figure which expands and shows the part of the core bit as a drilling tool, and the adapter as an attachment part.

FIG. 4 is a view showing another embodiment of the present invention, and is an enlarged view showing a core bit as a drilling tool and an adapter as an attachment part.

FIG. 5 is a view showing still another embodiment according to the present invention, and is an enlarged view showing a core bit as a drilling tool and an adapter as an attachment part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drilling device C ... Excavated object 1a ... Drilling device main body 1b ... Power supply 2 ... Direct motor (motor) 7 ... Cable 11 ... Rotating shaft 12 ... Adapter (Mounting part) 12b ... female screw part 12c ... mounting surface 12d ... ridge (axis alignment part) 13 ... core bit (piercing tool) 13a ... attaching and detaching part 13d ... attaching and detaching surface 13e ... recess (axis alignment part) 15 ... bit 17 ... rotor 18 ... stator

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Imaoka 681 Saedo-cho, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Japan Diamond Co., Ltd. (72) Inventor Kyushu Sato 5-3-13 Sotokanda, Chiyoda-ku, Tokyo Onda Building 201 F-term (Reference) 3C036 EE18 3C069 AA04 BA09 BB03 CA07 EA01 EA02

Claims (9)

[Claims] 1. A drilling tool which is formed in a cylindrical shape, and is provided with a bit for drilling an object to be excavated at a tip thereof, and which is driven to rotate around an axis and is fed toward the tip in the axial direction; A motor for driving, the motor comprising: a cylindrical rotor integrally provided with a rotating shaft through which the drilling tool is attached at a tip; and a cylindrical stator provided on an outer peripheral surface of the rotor. A drilling device configured to rotate the rotary shaft around an axis, comprising: a mounting portion for mounting the drilling tool at a tip of the rotary shaft; and a base for the drilling tool. At the end, an attachment / detachment portion is provided, which is detachably attached to the attachment portion. On the distal end side of the attachment portion, an attachment surface is formed facing the attachment / detachment portion, and on the base end side of the attachment / detachment portion. Is the mounting part An attachment / detachment surface which can be brought into contact with the attachment surface is formed.The attachment surface and the attachment / detachment surface are respectively formed along the axial direction, and the axis of the rotating shaft and the axis of the drilling tool are formed. Are aligned with each other in the axial direction in a state where they are matched with each other, and an axial alignment portion that restricts movement of the drilling tool in a direction intersecting with the axial direction in the fitted state is formed. Drilling device characterized. 2. The drilling device according to claim 1, wherein each of the attaching portion and the attaching / detaching portion is configured to rotate the drilling tool in a direction opposite to a direction in which the drilling tool is rotationally driven around the axis. A male screw portion and a female screw portion which are screwed together are formed, and the axial alignment portion is formed in a circumferential direction. 3. The drilling device according to claim 2, wherein the axial alignment portion includes a ridge formed in the mounting surface and the attachment / detachment surface in a circumferential direction, and a concave portion in which the ridge is fitted. A perforation device comprising: 4. The perforating apparatus according to claim 2, wherein the axis aligning portion is in close contact with the mounting surface and the mounting / removing surface, wherein the mounting surface and the mounting / removing surface are in contact with each other. A perforation device characterized by having a tapered surface. 5. The drilling device according to claim 2, wherein the female screw portion is formed in the mounting portion. 6. The drilling device according to claim 1, wherein the mounting portion is detachably provided on the rotating shaft. 7. A cylindrical rotor provided integrally with a rotary shaft penetrating therethrough, and a cylindrical stator provided on an outer peripheral surface of the rotor to rotate the rotary shaft about an axis. A drilling tool attached to the tip of the rotating shaft of the motor having the above configuration, and driven to rotate around the axis and sent to the tip in the axial direction, wherein the drilling tool is formed in a cylindrical shape and covered with the tip. A bit for drilling an excavated object is provided, and a base portion is provided with a detachable portion that is detachably attached to an attachment portion provided at the distal end of the rotary shaft. A mounting surface formed on the distal end side of the mounting portion facing the portion, and a detachable surface capable of contacting the mounting surface is formed, and the mounting surface is formed with an axis aligning portion along the axial direction; Is formed on the mounting surface along the axial direction. The shaft alignment portion, the axis of the rotary shaft, the axis of the drilling tool can be fitted in a state of being aligned, and, in the fitted state of the drilling tool in the direction intersecting the axial direction A drilling tool characterized by being formed so as to restrain movement. 8. The drilling tool according to claim 7, wherein the attachment / detachment portion includes a screw formed on the attachment portion, the screw being turned in a direction opposite to the direction of being driven to rotate about the axis. A drilling tool, wherein a screw portion to be attached is formed, and the axis alignment portion is formed in a circumferential direction. 9. The drilling tool according to claim 8, wherein the axial alignment portion formed on the attachment / detachment surface is fitted to a ridge formed on the mounting surface as the axial alignment portion in a circumferential direction. A drilling tool, characterized in that the recess is formed in a circumferential direction.