JP2006219940A - Drilling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling device which can generate a large striking force, can bore a large-diameter hole, and achieves high excavation efficiency even if the device is small in size and light in weight, by employing a penetration type drill head which is provided with a spring for energizing a weight hammer, and strikes a striking object (chuck piece) with a striking force which is obtained by adding an energizing force of the spring to a striking force of the dropping weight hammer. <P>SOLUTION: The penetration type drill head 3 has built therein a chuck mechanism 10 for gripping a drill rod 9, a driving mechanism 11 for applying a rotational force to the drill rod, and a striking mechanism 12 for applying a striking force to the drill rod. The striking mechanism is formed of a hollow weight hammer 19 in which the drill rod penetrates, so as to be slidable in a manner concentric with a spindle 13, the spring 20 for applying an energizing force to the weight hammer, and a rotary body 21 having an engaging claw 22 which engages with the weight hammer when rotated from an original location to move the weight hammer in a direction that increases the energizing force of the spring, and cancels the engagement at a predetermined location. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drilling device having a penetrating drill head, and in particular, the penetrating drill head is provided with a spring for urging the weight hammer on the weight hammer, and the impact force and spring force caused by the fall (gravity) of the weight hammer are provided. The present invention relates to a hole drilling device having a built-in striking mechanism for striking an object to be hit (chuck piece) with a striking force applied with an urging force.

In the penetration type drill head, the drilling rod passes through the drill head, and the transmission of the rotational force, the feeding force and the striking force (impact force) is performed through a chuck mechanism that holds the drilling rod. . Since the drilling rod penetrates the drill head, the through-type drill head can drill holes by repeatedly opening and closing the chuck mechanism and moving the drill head back and forth (back and forth), regardless of the length of the leader length, Long drilling rods can be used even if the leader is short. Most conventional penetrating drill heads strike the spindle (see, for example, Patent Document 1).
In this way, when hitting the spindle and the portion of the drill head outside the spindle, the impact force (impact force) is transmitted from the chuck mechanism to the drill rod via the spindle, so the impact energy is attenuated and the impact efficiency is increased. There is a bad problem.
Also, when hitting the spindle or other parts of the drill head, the impact due to the impact is directly transmitted to the devices and parts in the drill head, and the devices and parts in the drill head are liable to be destroyed and also cause failure. There are challenges.

In view of this, the present inventor has provided a drilling device that hits a chuck piece provided on a spindle with a hollow piston in the spindle as a drilling device that solves such problems (for example, see Patent Document 2).
Japanese Patent No. 2784454 JP 2001-123783 A

However, since the conventional drilling device uses a hollow piston of a hollow percussion cylinder for striking, there are the following problems.
(1) Since the hollow percussion cylinder uses hydraulic pressure for the operation of the hollow piston, a hydraulic circuit or the like is provided, which makes the structure complicated and expensive.
(2) A hollow percussion cylinder, a hydraulic pump, etc. are required, resulting in increased equipment costs.
(3) Since the striking force is generated by striking the hollow piston of the hollow percussion cylinder, a large striking force cannot be expected with a single striking. Therefore, drilling is performed by increasing the number of times of hitting with the hollow piston, but this increases the noise generated by the hitting and increases the number of impacts caused by hitting, destroying the devices and parts in the drill head. It is easy to cause failure.

  The present invention has been proposed in view of such a problem, and the object thereof is to provide a weight hammer with a spring for urging the weight hammer, and to apply a weight between the striking force due to the fall of the weight hammer and the urging force of the spring. Uses a penetrating drill head that drills holes by hitting the hitting object (chuck piece) with the applied impact force, generates a large impact force even with a small size, enables drilling with a large drilling diameter, and is lightweight and compact However, it is to provide a drilling device with high excavation efficiency.

In order to achieve the above object, a drilling device of the present invention is provided with a slide table that is slidably provided along a leader by a feeding device on a leader that is erected on a base machine. A through-type drill head is fixed to the slide table. This drill head has a chuck mechanism for gripping the drilling rod, a driving mechanism for applying a rotational force to the drilling rod, and a striking mechanism for giving a striking force to the drilling rod. In a drilling device that applies rotational force, striking force and feed force to the drilling rod gripped by the chuck mechanism,
The chuck mechanism is configured such that a chuck piece is provided on a rotatable cylindrical spindle, and the chuck piece grips the outer periphery of a drilling rod that passes through the spindle,
A drive mechanism that applies a rotational force to the drilling rod is connected to the spindle via a transmission mechanism, and a drilling rod that passes through the spindle and is gripped by a chuck piece is rotated by the rotation of the spindle that is driven by the motor. As a configuration
In the striking mechanism, a hollow weight hammer through which the drilling rod passes is provided so as to be slidable concentrically with the spindle, and all or part of the weight hammer advances and retreats along the inner peripheral surface in the spindle. The chuck piece for gripping the drilling rod is hit in the axial direction, and the weight hammer is locked from the original position by rotating with a spring for applying a biasing force to the weight hammer. And a rotating body provided with a locking claw for releasing the locking at a predetermined position and moving the spring in a direction in which the biasing force of the spring is increased. The weight hammer is moved in the direction of its original position by the gravity and the biasing force of the spring by releasing the lock at a predetermined position, and the gravity of the weight hammer and the biasing of the spring are moved. Characterized in that it comprises a structure in which striking the chuck pieces holding the drilled rod by weighted striking force and.

Thereby, although it is a penetration type drill head, the chuck piece which is a hit object can be hit with the hitting force with which the gravity of the weight hammer and the energizing force of the spring were added. Therefore, not only vertical direction but also oblique direction drilling is possible. Further, the weight hammer can be lifted by the rotation of the rotating body and can be dropped.
Further, since the chuck piece that chucks (holds) the drilling rod is directly hit, the hitting efficiency is extremely good with almost no attenuation of hitting energy until the hitting force is transmitted to the drilling rod.
Further, since the chuck piece that chucks the drilling rod is directly hit, the hit energy is not directly transmitted to the devices and parts inside the drill head. Therefore, breakage of the drill head device and parts due to impact is prevented, and failure is eliminated.

Further, the spindle of the drilling device according to the present invention has an inner diameter at which all or a part of the weight hammer is located as a large diameter part, and all or a part of the weight hammer is disposed at a large diameter part of the spindle inner diameter. And a chuck piece that slides along the inner peripheral surface of the spindle and strikes the chucking rod in the axial direction.
As a result, in addition to the above action, the weight hammer advances and retreats at the same surface as the inner peripheral surface of the spindle or at a position retracted from the inner peripheral surface, so that it does not interfere with the passage of the drilled rod. Since it does not come into contact with the hole rod, it does not cause a failure and the weight hammer moves smoothly.

Further, the chuck piece of the hole drilling device of the present invention includes a hammering / feeding chuck piece for transmitting a striking force and a feeding force to the hole drilling rod, and a rotation transmitting chuck piece for transmitting a rotational force to the hole drilling rod. It is comprised by these.
As a result, it is possible to more reliably transmit the striking force, the feeding force, and the rotational force to the drilling rod in addition to the above-described effects.

Further, the locking claw of the rotating body of the drilling device according to the present invention is provided so as to protrude radially from the body of the rotating body, and the portion of the weight hammer where the locking claw of the rotating body is locked is notched. The locking claw of the rotating body is located at the cutout portion of the weight hammer and is locked to the weight hammer and is moved in a direction in which the urging force of the spring is increased.
As a result, in addition to the above-described effects, the locking pawls of the rotating body are positioned at the notches of the weight hammer (that is, enter the notches) to lock the weight hammer. The rotating body can be brought closer to the weight hammer side (the center side of the drill head), and the size can be reduced.

Furthermore, the locking claws of the rotating body of the drilling device according to the present invention are provided at both ends of the body of the rotating body so as to protrude radially, and the respective locking claws of the weight hammer rotating body are locked. The parts to be formed are formed in the notched portions, and the locking claws on both ends of the rotating body are located in the notched portions of the weight hammer and lock the weight hammer in a manner that sandwiches a part of the weight hammer from both sides, The biasing force of the spring is moved in the increasing direction.
As a result, in addition to the above-described effects, the locking claw of the rotating body locks and lifts a part of the weight hammer from both sides, so that the weight hammer rotates around its axis, There is no disturbance and accurate operation is possible.

According to the drilling device of the present invention, the following effects can be obtained.
(1) Gravity due to the free fall of the weight hammer and the biasing force of the spring are applied as the striking force. Therefore, a large striking force can be applied, and the striking force can be controlled not only by the weight of the weight hammer and the height of lifting (the height of dropping) but also by a spring. Since the falling speed is faster than the free fall of the weight hammer, the number of hits can be reduced, and the drilling efficiency can be improved.

(2) Since the weight hammer is lifted and dropped by the rotation of the rotating body, the fall distance can be reduced and the structure can be simplified, so that the size can be reduced. In addition, the locking pawls of the rotating body are positioned at the notch of the weight hammer (entering the notch) to lock the weight hammer, so that the rotating body is connected to the weight hammer side (drill head). Can be further reduced in size.
(3) Since the weight hammer is lifted and dropped by the rotation of the rotating body, adjustment of increase / decrease of the number of hits within a predetermined time is facilitated, and the number of hits by the weight hammer is made plural by one rotation of the rotating body. In addition, since the number of hits can be adjusted by the rotation speed of the rotating body, the number of hits can be increased in combination with the fall speed of the weight hammer.

(4) The weight hammer is lifted and dropped by the rotation of the rotating body, and the weight hammer is urged and dropped by the urging force of the spring, so that the timing of hitting can be easily adjusted.
(5) Since the urging force of the spring acts on the weight hammer, the striking force can be applied not only in the vertical direction but also in the oblique direction.
(6) A striking force, a rotational force, and a feeding force can be selectively applied, and the magnitude of the striking force can be increased / decreased, the number of times of striking, the number of revolutions can be adjusted.
(7) Since the locking pawls of the rotating body are locked by lifting a part of the weight hammer from both sides and lifted and dropped, the weight hammer does not rotate around the axis, and the position is not disturbed. Good operation is possible.

(8) Since the chuck piece that chucks (grips) the drilling rod is directly hit, the hitting efficiency is very good with almost no attenuation of hitting energy until the hitting force is transmitted to the drilling rod.
(9) Further, since the chuck piece that chucks the drilling rod is directly hit, the hit energy is not directly transmitted to the devices and parts inside the drill head. Therefore, breakage of the drill head device and parts due to impact is prevented, and failure is eliminated.
(10) Since the impact is performed inside the spindle, noise due to impact is hardly leaked to the outside, and there is almost no noise pollution.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a drilling device showing an embodiment of the present invention, FIG. 2 is a perspective view showing the main part of FIG. 1A, and FIG. 3 is a cross-sectional view showing the main part of FIG.

In the hole drilling device of the present invention, a leader 2 is erected on a base machine 1 so that it can be tilted up and down, and a penetrating drill head 3 (hereinafter abbreviated as a drill head) is slidably provided on the leader 2. Composed. In this example, a crawler type is shown as the base machine 1, but this may be a mounting type. The leader 2 is erected on a base main body 5 provided on the lower traveling body 4 so as to be able to turn, through various cylinders 6 so that the leader 2 can be tilted up and down. The base body 5 is provided with a power unit, a control box, and the like. The base body 5 is provided with an outrigger (not shown) so as to stably support the base machine 1 during work.
The reader 2 is provided with a slide table 7 slidably along the reader 2, and the drill head 3 is fixed to the slide table 7. A feeding device 8 is connected to the slide table 7 and is advanced and retracted. Examples of the feeding device 8 include a field chain that is driven and transmitted through a hydraulic cylinder or a sprocket from a drive motor.

  2 and 3, the drill head 3 includes a chuck mechanism 10 that grips the drilling rod 9, a drive mechanism 11 that applies a rotational force to the drilling rod 9, and a striking mechanism that provides a striking force to the drilling rod 9. 12 is built in. Therefore, the drilling rod 9 gripped by the chuck mechanism 10 is given a rotational force by the drive mechanism 11, a striking force is given by the striking mechanism 12, and a feeding force is given by the feeding device 8.

The chuck mechanism 10 is configured such that a chuck piece 14 is provided on a rotatable cylindrical spindle 13 and the chuck piece 14 grips the outer periphery of a drilling rod 9 penetrating through the spindle 13.
The spindle 13 has a hollow cylindrical shape through which the drilling rod 9 passes, and is attached to the head main body 3a so as to be able to rotate and advance and retreat by a certain distance. A restoring spring 23 is disposed below the spindle 13 and is configured to return to its original position when the external force is removed after moving by striking. The spring 23 also serves as a buffer. In this example, a leaf spring is illustrated as the spring 23. The chuck piece 14 is provided on the spindle 13 so as to be able to advance and retract toward the center, and is configured to grip the drilling rod 9 penetrating the spindle 13. The chuck piece 14 may be provided at one place, but usually, a plurality of chuck pieces 14 are provided at predetermined intervals in the circumferential direction of the spindle 13. For example, three pieces are provided at intervals of 120 degrees in the circumferential direction of the spindle 13, and the drilling rod 9 is gripped at three places on the circumference. Conventionally known means can be adopted for the advance and retreat drive of the chuck piece 14. For example, a configuration in which the wedge piece is advanced and retracted hydraulically on the inclined surface 14a on the outer side of the chuck piece 14 can be exemplified.
The chuck piece 14 has a vertical position different from that of the spindle 13 and transmits a striking force / feeding force to the drilling rod 9 and a rotational force to the drilling rod 9. The rotation transmission chuck piece may be provided. In this way, the chuck piece 14 can be configured to correspond to the function, and the occurrence of deterioration in the function of the chuck piece 14 is reduced, and the impact force, the feeding force, and the rotational force are transmitted to the drilling rod 9. Is more preferable because it can be made more reliable.

In the drive mechanism 11 for applying a rotational force to the drill rod 9, a spindle gear 15 is provided on a spindle 13 by spline coupling 16, and a gear 18 provided on a drive shaft of a motor 17 is engaged with the spindle gear 15. Is configured to rotate the spindle 13 via the transmission mechanism of the gears 18 and 15.
Since the spindle gear 15 is provided on the outer periphery of the spindle 13 by spline coupling 16, both can move relative to each other. Therefore, the spindle gear 15 can maintain the meshing position with the gear 18 even if the spindle 13 moves forward and backward.
Since the drilling rod 9 penetrating the spindle 13 is held by a chuck piece 14 provided on the spindle 13, the motor 17 is driven to rotate the spindle 13 through the transmission mechanisms of the gears 18 and 15 to cut the rod 13. Rotational force can be transmitted to the hole rod 9 and thereby it can be rotated.

  In the striking mechanism 12, a hollow weight hammer 19 through which the drilling rod 9 passes is provided so as to be slidable concentrically with the spindle 13, and a lower portion of the weight hammer 19 is fitted into the spindle 13 so that the spindle 13 The chuck piece 14 that moves forward and backward along the inner circumferential surface and strikes the chucking rod 14 in the axial direction, and further rotates with a spring 20 that applies a biasing force to the weight hammer 19. And a rotating body 21 provided with a locking claw 22 that locks the weight hammer 19 from its original position and moves the spring 20 in a direction in which the urging force of the spring 20 increases and releases the locking at a predetermined position. The weight hammer 19 is locked by the rotation of the rotating body 21 and moved in the direction in which the urging force of the spring 20 is increased, and the weight hammer is released by releasing the lock at a predetermined position. 9 moves in the direction of the original position by the gravity and the urging force of the spring 20, and strikes the chuck piece 14 that grips the drilling rod 9 by the weighting force of the weight hammer 19 and the urging force of the spring 20. It has a configuration.

  Weight hammer 19 The center is a hollow through which the drilling rod 9 passes, and is arranged concentrically with the spindle 13 directly above the spindle 13, and the drilling rod 9 can be set through the spindle 13 and the weight hammer 19. It has become. Accordingly, the spindle 13 and the weight hammer 19 are arranged so as to be vertically arranged around the drilled rod 9 penetrating. The lower portion of the weight hammer 19 is inserted into the spindle 13, advances and retreats along the inner peripheral surface in the spindle 13, and strikes the chuck piece 14 that grips the drilling rod 9 in the axial direction. Yes. Therefore, the spindle 13 has a large diameter portion 13a (see FIG. 3) as an inner diameter at a position where the lower portion of the weight hammer 19 is inserted and advances and retreats along the inner peripheral surface, and a portion of the weight hammer 19 inserted into the spindle 13 is When the chuck piece 14 that is disposed at the large diameter portion 13a of the spindle 13 and slides along the inner peripheral surface of the spindle 13 and grips the drilling rod 9 is hit in the axial direction. Since the hollow inner peripheral surface of the weight hammer 19 is the same as the inner peripheral surface of the spindle 13 or moves back and forth at a position retracted from the inner peripheral surface, it does not interfere with the passage of the drilled rod. Since it does not come into contact with the drilling rod 9, it does not cause a failure, and the movement of the weight hammer becomes smooth, which is preferable.

The locking claw 22 of the rotating body 21 is provided so as to protrude from the body 21a of the rotating body 21 in the radial direction (radial direction), and the portion of the weight hammer 19 where the locking claw 22 of the rotating body 21 is locked is cut. The locking claw 22 of the rotating body 21 is formed in the cutout portion 19a that is notched, and is positioned at the cutout portion 19a of the weight hammer 19 (that is, enters the cutout portion 19a) so as to lock the weight hammer 19. It has become. A motor (not shown) is connected to the rotating body 21 and is driven to rotate.
Further, a spring (compression spring in this example) 20 for applying a biasing force to the weight hammer 19 is provided between the weight hammer 19 and the top plate 3b of the head body 3a as shown in FIG.

  Therefore, when the rotating body 21 is rotated, the locking claw 22 of the rotating body 21 locks the notch 19a of the weight hammer 19 and lifts it upward from below. At this time, the compression spring 20 is compressed by the weight hammer 19 and the urging force is increased. Then, when the locking claw 22 of the rotating body 21 rotates and passes through the top dead center, the locking claw 22 and the cutout portion 19a of the weight hammer 19 are disengaged. It falls by the urging force and hits the chuck piece 14 as the hit object. This striking force is obtained by weighting the weight of the weight hammer 19 and the biasing force of the spring 20.

  In FIG. 2 and FIG. 3, the two locking claws 22 are provided on the rotating body 21 with an interval of 180 °. The number of hits. Therefore, if the spring force of the spring 20 is constant, the number of hits within a predetermined time can be determined by the rotational speed. Further, by increasing or decreasing the number of the locking claws 22 provided on the rotating body 21, the number of hits can be increased or decreased even at the same rotational speed. For example, when the rotating body 21 has one locking claw 22, the number of hits per rotation is one, and if the rotating body 21 is provided with three locking claws 22 at 120 ° intervals, Three rotations can be obtained in one rotation. In such a drill head 3, since the urging force of the spring 20 acts on the weight hammer 19, not only the vertical direction but also an oblique striking force can be applied.

The weight hammer 19 is preferably mounted in the head main body 3a so as not to rotate but to be slidable in the axial direction because the weight hammer 19 does not rotate when the weight hammer 19 is lifted or dropped.
Further, as shown in FIG. 4, the locking claws 22 of the rotator 21 are provided at both ends of the body 21 a of the rotator 21 so as to go out in the radial direction (radial direction), and each of the rotators 21 of the weight hammer 19. The engaging claws 22, 22 are formed in the notched portions 19 a, 19 a, and the engaging claws 22 at both ends of the rotating body 21 are located in the notched portions 19 a of the weight hammer 19. A structure in which the weight hammer 19 is locked in such a manner as to sandwich a portion 19b (see FIG. 4) of the weight hammer 19 from both sides (that is, entering the notch 19a) and moved in a direction in which the urging force of the spring 20 increases. Then, the rotation of the weight hammer 19 around the axis can be prevented, and a positional shift does not occur, which is preferable. As described above, the locking claw 22 provided on the rotating body 21 may be singular or plural, and the rotating body 21 including the locking claw 14 may be singular or plural. Correspondingly, the notch 19a of the weight hammer 19 is increased or decreased, and the position where the notch 11a is provided also changes.

As can be understood from the above description, according to the drilling device of the present invention, the chuck mechanism 10 holds the drilling rod 9 penetrating through the spindle 13 with the chuck piece 14. 15 can be transmitted to the drilling rod 9 via the spindle 13 and the chuck piece 14, whereby the drilling rod 9 can be rotated. Further, the drill head 3 is fixed to a slide table 7 that slides along the leader 2, and a feeding device 8 is connected to the slide table 7, so that the sliding table 7 is advanced and retracted by this feeding device 8. Accordingly, the drill head 3 can also be advanced and retracted. Accordingly, since the drilling rod 9 is held by the chuck mechanism 10 built in the drill head 3, the feeding force of the feeding device 8 is transmitted to the drilling rod 9 via the slide table 7 and the drill head 3. As a result, the drilling rod 9 can be advanced and retracted. Further, the striking mechanism 12 is configured so that the hollow weight hammer 19 through which the drilling rod 9 penetrates the chuck piece 14 holding the drilling rod 9 in the spindle 13 between the weight of the weight hammer 19 and the biasing force of the spring 20. Since the striking force is applied with a heavy striking force, this striking force can be transmitted to the drilling rod 9 via the chuck piece 14. Therefore, the drilling rod 9 passes through the drill head 3 and its outer peripheral surface is gripped and attached by the chuck mechanism 10, where the motor 17, the feeding device 8 and the striking mechanism 12 are driven (the driving of the striking mechanism 12 is When the motor (not shown) connected to the rotating body 21 is driven), the drill rod 9 is rotated by the motor 17 via the spindle 13 and the chuck mechanism 10, moved forward and backward by the feeding device 8, and hitting the hitting mechanism 12. Communicated. That is, since the advance and retreat in the feeding device 8 is the feeding and the drawing, it is possible to transmit the rotational force, the feeding force, the drawing force and the striking force to the drilling rod 9. As a result, the ground can be drilled by rotating, feeding and striking the drilling rod 9.
At this time, the drive of the motor 17 is stopped (OFF), the rotation of the spindle 13 is stopped, and only the weight hammer 19 is operated by the drive of the striking mechanism 12 alone. It is also possible to stop the driving of the striking mechanism 12 and rotate only the spindle 13 by driving the motor 17 to apply only the rotational force and the feeding force.

5 and 6 are cross-sectional views showing an embodiment of the drill head of the drilling device of the present invention. FIG. 5 shows the embodiment before operation, FIG. 6 shows the operation in progress, and FIG. 2 and FIG. The same components are denoted by the same reference numerals.
The drill head 3 of this embodiment incorporates a chuck mechanism 10 that grips the drilling rod 9, a drive mechanism 11 that applies a rotational force to the drilling rod 9, and a striking mechanism 12 that provides a striking force to the drilling rod. It goes without saying that the drill head 3 is fixed to a slide table that advances and retreats along the leader by the feeding device.

The chuck mechanism 10 is configured such that a chuck piece 14 is provided on a rotatable cylindrical spindle 13, and the chuck piece 14 grips the outer periphery of the drill rod 9 passing through the spindle 13.
A drive mechanism 11 that applies a rotational force to the drilling rod 9 is connected to a spindle 13 via a spindle gear 15 and a gear 18, and a motor 17 is coupled to the drilling rod 9 that penetrates the spindle 13 and is gripped by a chuck piece 14. , It is configured to rotate by the rotation of the spindle 13 driven by the motor 17,
In the striking mechanism 12, a hollow weight hammer 19 through which the drilling rod 9 passes is provided slidably on the spindle 13 and concentrically with the spindle 13, and the lower portion of the weight hammer 19 is inserted into the spindle 13. In the spindle 13, the chuck piece 14 moves forward and backward along the inner peripheral surface and strikes the chuck piece 14 that holds the drilling rod 9 in the axial direction.

The striking mechanism 12 is further rotated by a compression spring 20 that applies an urging force to the weight hammer 19 and is rotated to lock the weight hammer 19 from its original position and move the urging force of the spring 20 in an increasing direction. And a rotating body 21 provided with a locking claw 22 for releasing the locking at a predetermined position. Accordingly, the weight hammer 19 is locked by the locking claw 22 by the rotation of the rotating body 21 and moved in the direction in which the urging force of the compression spring 20 is increased. The chuck piece 14 is moved in the original direction by gravity due to free fall and the biasing force of the compression spring 20, and grips the drilling rod 9 by the weighted striking force of the gravity of the weight hammer 19 and the biasing force of the spring 20. Blow.
Therefore, the drill head 3 of the embodiment shown in FIGS. 5 and 6 also has the same action as the drill head shown in FIGS. 5 and 6 are specific examples as examples, and specific members are displayed. However, it can be well understood by referring to FIG. 2 and FIG.

  The embodiments and examples are not intended to limit the present invention, and various modifications can be made without departing from the scope of the invention.

1 is a front view of a drilling device showing an embodiment of the present invention. It is a perspective view which shows the principal part of the FIG. 1A part. It is sectional drawing which shows the principal part of the FIG. 1A part. It is a disassembled perspective view of the part of the weight hammer and rotary body which shows other embodiment of this invention. It is sectional drawing of the drill head which shows the Example of this invention, and shows before an operation | movement. It is sectional drawing of the drill head which shows the Example of this invention, and shows the middle of operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base machine 2 Leader 3 Through-type drill head 3a Head main body 7 Slide table 8 Feeding device 9 Drilling rod 10 Chuck mechanism 11 Drive mechanism 12 Impact mechanism 13 Spindle 14 Chuck piece 15 Spindle gear 17 Motor 18 Gear 19 Weight hammer 19a Notch Part 20 Spring (compression spring)
21 Rotating body 22 Locking claw

Claims (5)

A slide table, which is advanced and retracted along the leader by a feeding device, is slidably provided on a leader standing upright on the base machine. A through-type drill head is fixed to the slide table. The head incorporates a chuck mechanism for gripping the drilling rod, a drive mechanism for applying rotational force to the drilling rod, and a striking mechanism for applying striking force to the drilling rod. In a drilling device that provides force and feed force,
The chuck mechanism is configured such that a chuck piece is provided on a rotatable cylindrical spindle, and the chuck piece grips the outer periphery of a drilling rod that passes through the spindle,
A drive mechanism that applies a rotational force to the drilling rod is connected to the spindle via a transmission mechanism, and a drilling rod that passes through the spindle and is gripped by a chuck piece is rotated by the rotation of the spindle that is driven by the motor. As a configuration
In the striking mechanism, a hollow weight hammer through which the drilling rod passes is provided so as to be slidable concentrically with the spindle, and all or part of the weight hammer advances and retreats along the inner peripheral surface in the spindle. The chuck piece for gripping the drilling rod is hit in the axial direction, and the weight hammer is locked from the original position by rotating with a spring for applying a biasing force to the weight hammer. And a rotating body provided with a locking claw for releasing the locking at a predetermined position and moving the spring in a direction in which the biasing force of the spring is increased. The weight hammer is moved in the direction of its original position by the gravity and the biasing force of the spring by releasing the lock at a predetermined position, and the gravity of the weight hammer and the biasing of the spring are moved. Drilling apparatus characterized by comprising a structure in which striking the chuck pieces holding the drilled rod by weighted striking force and.   The spindle has an inner diameter at which all or part of the weight hammer is positioned as a large diameter part, and all or part of the weight hammer is disposed at the large diameter part of the spindle inner diameter along the inner peripheral surface of the spindle. 2. The drilling device according to claim 1, wherein the drilling device is provided to slide and hit a chuck piece that grips the drilling rod in the axial direction.   The chuck piece is composed of a hitting / feeding chuck piece that transmits a striking force and a feeding force to the drilling rod, and a rotation transmitting chuck piece that transmits a rotating force to the drilling rod. The drilling device according to claim 1 or 2.   The locking claw of the rotating body is provided so as to protrude in the radial direction from the body portion of the rotating body, and the portion of the weight hammer where the locking claw of the rotating body is locked is formed in a notched cut portion. The body locking claw is located at a notch portion of the weight hammer, locks the weight hammer, and moves in a direction in which the urging force of the spring increases. Drilling device.   The locking claws of the rotating body are provided radially outward at both ends of the body of the rotating body, and the portions to which the locking claws of the rotating body of the weight hammer are locked are notched. The locking claws at both ends of the rotating body are located in the notch portion of the weight hammer and lock the weight hammer so that a part of the weight hammer is sandwiched from both sides, so that the urging force of the spring increases. The drilling device according to any one of claims 1 to 3, wherein the drilling device is moved.

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