JP2003074280A - Vibrating drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reduced noise type vibrating drill that can provide sufficient noise reducing effect without cost increase, taking no special manufacturing trouble, and moreover without enlarging a machine or impairing usability. SOLUTION: In this drill, a piston provided movably forward and backward in a cylinder of a drill head is operated back and forth by fluid pressure, and the impact force is transmitted to a bit through a drilling rod to drill a hole. The piston and the drilling rod whose tip is mounted with the bit are integrally connected. The forward and backward operation of the piston by the fluid pressure is performed by providing the outer periphery of the piston with a rotary valve rotated around the piston and changing a pressure fluid alternately to the piston rear chamber and front chamber of the cylinder by the rotation of the rotary valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device such as a rotary percussion drill for reducing noise generated by hitting a hammer, and more particularly to a vibration drill.

[0002]

2. Description of the Related Art A drilling device applies a turning force and a feeding force, a hitting force and a feeding force, and a turning force, a hitting force and a feeding force to a bit through a drilling rod. Various kinds of things have been proposed. Above all, a drilling device (rotary percussion drill) that drills a bit by giving a rotating force, a striking force and a feeding force to a bit through a drilling rod,
It is known that rapid excavation is possible not only in bedrock but also in gravel and boulder layers where it is difficult to excavate.

FIG. 7 is a sectional view showing an example of a drill head of a conventional rotary percussion drill. A hammer sub 102 is provided inside the drill head body 101, and a hammer pool (piston) 103 is arranged behind the hammer sub 102 with their axes aligned. Hummus pool 10
3 is slidably (movably back and forth) housed in the percussion cylinder 104, and is operated back and forth by the operation of the cylinder 104. A spindle gear 105 is provided on the outer periphery of the hammer sub 102 so as to be relatively movable via a pin 106, and a pinion 108 of a motor 107 is meshed with the spindle gear 105. The hammer sub 102 and the spindle gear 105 may be connected to each other by spline connection so as to be relatively movable. A spring guide 109 is provided on the outer circumference of the hammer sub 102, and a disc spring 110 is arranged on the outer circumference thereof. The disc spring 110 biases the hammer sub 102 rearward in the axial direction.

The drill head body 101 has a slider 11 which slides along the leader with bolts 111.
It is fixed to 2, and the drill head is provided with a feeding force by running the slider during excavation. In FIG. 7, 113 is a distributor valve, 114, 1
Reference numeral 15 indicates an accumulator.

When excavating, the hammer sub 102 is connected to the rod sub (which may not be present) and the excavating rod (neither is shown) so that the drill head advances and the hammer sub 102 drives the motor 107. To rotate. Also, the hammer mass pool 103 is operated by the operation of the percussion cylinder 104, and the hammer sub 1
Hit the rear end of 02. That is, the bit attached to the tip of the excavating rod has a feed force as the drill head advances, a rotational force as the hammer sub 102 rotates by the drive of the motor 107, and a hammer sub 102 by the hammer pool (piston) 103. The impact force is imparted by the impact of.

[0006]

In such a drilling apparatus, the hammer mass pool 103 of the percussion cylinder 104 strikes the rear end (head) of the hammer sub 102 to transfer the impact force to the bit through the excavating rod. Since it is provided, a collision sound (a hit sound) in which the hammer pool (piston) 103 hits the hammer sub 102 is generated,
There is a problem that it is released as noise into the atmosphere and becomes a problem as noise pollution. Therefore, this type of drilling device has a disadvantage that it cannot be used in urban areas or urban areas.

Conventionally, as a measure for preventing such noise,
(1) A drill head with a box-shaped soundproof cover attached, (2) A rubber head inside the drill head, and (3) Each of the drill heads. A vibration insulation member is provided at the joint of the members,
(4) Various types have been proposed, such as those in which a vibration damping member is provided around the members forming the drill head.

However, providing soundproofing means to the drill head in this manner requires much labor for manufacturing, and
High cost. In addition, as described in (1) and (4), the box-shaped soundproof cover and the vibration damping member provided around it have a problem in that the size of the machine becomes large and the operating part is covered by the cover, which deteriorates the usability. is there. further,
Providing an internal rubber cover or a vibration insulating member as in (2) and (3) cannot obtain a sufficient soundproof effect.

The present invention has been proposed in view of the conventional problems as described above, and an object of the present invention is that no special labor is required for manufacturing, the cost is not increased, and the size of the machine is increased. Without sacrificing ease of use
It is to provide a low noise type vibration drill (drilling device) capable of obtaining a sufficient noise reduction effect.

[0010]

In order to achieve the above object, in a vibrating drill according to claim 1 of the present invention, a piston provided in a cylinder of a drill head so as to be movable back and forth is operated back and forth by fluid pressure. A vibrating drill that transmits the striking force to a bit through a drill rod to drill a hole is characterized in that the piston and a drill rod having a bit mounted at a tip thereof are integrally connected.

According to a second aspect of the present invention, in a vibrating drill, a piston provided in a cylinder of a drill head so as to be movable back and forth is operated forward and backward by fluid pressure, and is rotated by a motor via a transmission mechanism. A vibrating drill that drills a bit by applying a striking force and a rotational force to the bit through the excavating rod, wherein the piston and the excavating rod having the bit attached to the tip are integrally connected.

Further, in the vibrating drill according to claim 3 of the present invention, a piston provided in the cylinder of the drill head so as to be movable back and forth is operated back and forth by fluid pressure, and the striking force is transmitted to the bit through the excavating rod. In the drill for making a hole, the piston and a drill rod having a bit attached to the tip are integrally connected, and the forward and backward movement of the piston due to fluid pressure is performed around the piston on the outer periphery of the piston. A rotating rotary valve is rotatably provided, and the pressure fluid is alternately switched between the rear chamber and the front chamber of the piston of the cylinder by the rotation of the rotary valve.

According to a fourth aspect of the present invention, in a vibrating drill, a piston provided in a cylinder of a drill head so as to be movable back and forth is operated back and forth by fluid pressure, and is rotated by a motor through a transmission mechanism. In a drill that drills a bit by giving a striking force and a rotational force to the bit via a drill rod, the piston and a drill rod having a bit mounted at the tip are integrally connected, and the piston is operated forward and backward by fluid pressure. The rotary valve that rotates around the piston is rotatably provided on the outer circumference of the piston, and the rotation of the rotary valve alternately switches the pressure fluid to the rear chamber and the front chamber of the piston of the cylinder. Characterize.

Further, in the vibration drill according to the fifth aspect of the present invention, the stroke end of the longitudinal movement of the piston is restricted by switching the pressure fluid by the rotation of the rotary valve to the rear chamber and the front chamber of the piston of the cylinder. It is characterized by

Further, in the vibrating drill according to claim 6 of the present invention, one rotation of the rotary valve causes the cylinder's piston rear chamber and front chamber to be alternately switched a plurality of times. It is characterized in that the piston reciprocates a plurality of times.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. 1 and 2 are sectional views of a drill head showing an embodiment of the present invention.

The cylinder 2 of the drill head 1 accommodates a piston 3 that slides back and forth with a pressure fluid (for example, pressure oil), and the front end side of the piston 3 has a drilling rod 6 with its axis aligned. Are connected together. Piston 3 and drill rod 6
Is integrally connected includes that the piston 3 and the excavating rod 6 may be integrally formed, or may be separately formed and connected. As for the connection, the excavation rod 6 may be directly connected to the piston 3, or may be connected via a connecting member. For example, the rod sub 4 is screwed 5 to the piston 3, and the excavation rod 6 is screwed to the rod sub 4 by a coupling (not shown). Therefore, a striking force (vibration) is applied to the bit 7 provided at the tip of the excavating rod 6 by the operation of the piston 3 by the operation of the cylinder 2. That is, the bit 7 operates (vibrates) together with the piston 3 through the excavation rod 6, and the operation (vibration) causes the bit 7 to strike the ground.

A rotary valve 8 which rotates around the piston 3 is rotatably provided on the outer periphery of the piston 3. The rotary valve 8 alternately switches the pressure fluid to the piston rear chamber 2a and the front chamber 2b of the cylinder 2 by rotation.

3 to 6 are sectional explanatory views showing the operation of the rotary valve 8 in the order of steps. First, as shown in FIG. 3, the rotary valve 8 rotates and the high pressure port HP
Is communicated with the notch 8a of the rotary valve 8, the high-pressure fluid enters the piston rear chamber 2a of the cylinder 2 and the piston 3 advances. At this time, the piston front chamber 2b of the cylinder 2 is
The cutout 8d of the rotary valve 8 communicates with the low pressure port LP, and the fluid flows out from the low pressure port LP.

Next, as shown in FIG. 4, the rotary valve 8
Continues to rotate, the notches 8a and 8d of the valve 8 are closed, and the piston 3 is ready to move from the forward movement to the backward movement.

Next, as shown in FIG. 5, the rotary valve 8
Continues to rotate, the notch 8b of the valve 8 communicates with the high pressure port HP, the high pressure fluid enters the piston front chamber 2b of the cylinder 2, and the piston 3 retracts. At this time, the piston rear chamber 2a of the cylinder 2 communicates with the notch 8c of the rotary valve 8, and the fluid flows out from the low pressure port LP.

Next, the rotary valve 8 continues to rotate, the notches 8b and 8c of the valve 8 are closed, and the piston 3 is ready to move from the backward movement to the forward movement. When the rotary valve 8 continues to rotate, the state changes from this state to the state shown in FIG. 1 and is repeated.

Actually, the step of one reciprocating motion of the piston 3 is repeated a plurality of times by one rotation of the rotary valve 8. Of course, one rotation of the rotary valve 8 may cause the piston 3 to reciprocate once.

Therefore, from the above description, the strokes of the forward movement and the backward movement of the piston 3 are determined by the circumferential lengths of the notches 8a and 8b of the rotary valve 8 and the rotary valve 8.
It can be understood that it can be determined by the rotation speed of. That is, it is determined by the time during which the notches 8a and 8b of the rotary valve 8 are in communication with the high pressure port HP. Further, it can be understood that the stroke end of the piston 3 can be regulated by switching the rotary valve 8. Further, it can be understood that the present invention can cope with a change in the weight to be loaded depending on the number of the excavating rods 6 connected to the piston 3.

A spindle gear 9 is provided on the piston 3 at the front end side so as to be movable relative to each other by spline coupling, and a drive gear 12 fixed to a drive shaft 11 of a motor 10 is attached to the spindle gear 9. It is meshed via the idler gear 13 (see FIG. 2). here,
The idler gear (intermediate gear) 13 may be eliminated and the spindle gear 9 may be directly meshed with the drive gear 12. Therefore, the piston 8 can be rotated by driving the motor 10, and this rotation imparts a rotational force to the bit 7 via the excavation rod 6.

The drive shaft 11 of the motor 10 has a
The gear 14 is fixed, and the gear 14 is engaged with the gear 15 of the rotary valve 8 to rotate the rotary valve 8 by driving the motor 10 (see FIG. 2). In this example, the drive gear 12 for rotating the piston 3 and the gear 14 for rotating the rotary valve 8 are integrally connected. Of course, this may be a separate body, and the motor may be separate. In FIG. 1, reference numerals 16 and 17 are accumulators, and the cylinder 2 is operated by these accumulators.

The drill head 1 thus constructed is
The drill head 1 is fixed to a slider (not shown) that advances and retreats along a leader or a guide cell (hereinafter referred to as a leader), and the drill head 1 travels (reciprocates) during excavation.
To go back and forth together. For example, a cylinder is connected to the slider and is moved back and forth. Therefore, the advance of the drill head 1 due to the traveling of the slider gives the bit 7 a feeding force through the excavating rod 6.

When excavating, the excavating rod 6 having the bit 7 attached to the piston 3 is connected (connected) to the piston 3 so that the drill head 1 moves forward and the piston 3 rotates by driving the motor 10. . Further, the piston 3 is operated by the operation of the cylinder 2, that is, the switching of the pressure fluid by the rotary valve 8, and the striking force is generated. As a result, the bit 7 attached to the tip of the excavation rod 6
The advance of the drill head 1 gives a feed force, the rotation of the piston 3 driven by the motor 10 gives a rotational force, and the operation of the cylinder 2 gives a striking force. The striking force at this time is transmitted as vibration because the reciprocating motion of the piston is short and the number of times per unit time is large.

At this time, since the piston 3, the excavation rod 6 and the bit 7 are integrally connected, they operate together with the operation of the piston 3, and the bit 7 directly strikes the ground. Therefore, the piston does not strike the hammer sub and transmit the striking force to the bit as in the conventional case shown in FIG. Therefore, the noise due to the impact is only the impact sound that the bit 7 strikes the ground, and does not generate the impact sound that hits the hammer sub as in the related art. Since the bit 7 enters into the hole as the hole is drilled, noise that hits the ground by the bit 7 is also reduced and transmitted to the outside, so that the noise is less generated. That is, with respect to the sound of impact of the bit 7 inside the drilled hole, the drilled hole has a soundproofing effect, and the noise to the outside is reduced.

The stroke end of the piston 3 is
Cylinder 2 of pressure fluid generated by rotation of rotary valve 8
Since the piston is regulated by switching to the rear chamber 2a and the front chamber 2b, the rotary valve 8 and each port will not be displaced. Furthermore, the weight can be actuated without being influenced by the weight of the excavating rods 6 connected to the piston 3 changing and being affected.

Although the rotary percussion drill has been described as the hole drilling device in the above-described embodiment, the present invention is not limited to this and includes a percussion drill. In this case, the mechanism for rotating the piston, that is, the configuration of the spindle gear 9, the drive gear 12, and the like becomes unnecessary.

[0032]

As described in detail above, the present invention is
There is no hitting sound that hits the hammer sub like in the past, but only the hitting sound that the bit hits the ground.As this bit also goes into the drilling hole as it drills, it also cuts the hitting sound of the bit. Since the holes have a soundproof effect, the amount of noise leaking to the outside is reduced and the noise is less generated.

Moreover, there is no special labor for manufacturing, the cost does not increase, the machine does not increase in size, and the usability is not impaired.

[Brief description of drawings]

FIG. 1 is a sectional view of a drill head showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a cutting surface different from that of FIG. 1 of the drill head showing the embodiment of the present invention.

FIG. 3 is a cross-sectional explanatory view showing an operating state of a rotary valve.

FIG. 4 is a cross-sectional explanatory view showing a next operating state of the rotary valve.

FIG. 5 is a cross-sectional explanatory view showing the next operation state of the rotary valve.

FIG. 6 is an explanatory sectional view showing a further operation state of the rotary valve.

FIG. 7 is a cross-sectional view showing an example of a drill head of a conventional rotary percussion drill.

[Explanation of symbols]

1 drill head 2 cylinders 3 pistons 6 drilling rod 7 bits 8 rotary valve 9 Spindle gear 10 motors 12 Drive Gear 14, 15 Ga HP High pressure port LP low pressure port

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsuneo Iwasaki             36 Tojo, Tojo-cho, Tojo-cho, Hiba-gun, Hiroshima Yama             Inside Motolock Machine Co., Ltd. (72) Inventor Kazuo Haga             36 Tojo, Tojo-cho, Tojo-cho, Hiba-gun, Hiroshima Yama             Inside Motolock Machine Co., Ltd. (72) Inventor Hongao Masamasa             36 Tojo, Tojo-cho, Tojo-cho, Hiba-gun, Hiroshima Yama             Inside Motolock Machine Co., Ltd. F-term (reference) 2D029 BA01                 2D058 AA14 BA11 CA03 CA05 CC04                 2D065 AA04 AA23 AA28                 3C069 AA05 BA10 BB01 BC02 DA00                       DA01 EA00

Claims (6)

[Claims] 1. A vibrating drill, wherein a piston provided in a cylinder of a drill head so as to be movable back and forth is operated forward and backward by fluid pressure, and the striking force is transmitted to a bit through a drill rod to drill a hole. A vibrating drill, characterized in that it is integrally connected to a drilling rod having a bit attached to its tip. 2. A piston, which is provided in a cylinder of a drill head so as to be movable back and forth, is moved forward and backward by a fluid pressure, and is rotated by a motor through a transmission mechanism, so that a bit and an impact force are applied to a bit through a drill rod. A vibrating drill for making a hole by providing a drill, wherein the piston and an excavating rod having a bit attached to a tip thereof are integrally connected. 3. A drill in which a piston provided in a cylinder of a drill head so as to be movable back and forth is operated back and forth by fluid pressure to transmit a striking force to a bit through a drill rod to drill a hole, wherein the piston and the tip end. A drilling rod to which a bit is attached is integrally connected, and for the forward and backward movement of the piston by fluid pressure, a rotary valve that rotates around the piston is rotatably provided on the outer periphery of the piston. An oscillating drill, characterized in that it is performed by alternately switching the pressure fluid between the rear chamber and the front chamber of the cylinder piston by the rotation of a rotary valve. 4. A piston, which is provided in a cylinder of a drill head so as to be movable back and forth, is moved forward and backward by fluid pressure, and is rotated by a motor through a transmission mechanism, and a striking force and a rotating force are applied to a bit through a drill rod. In a drill for drilling a hole, the piston and a drilling rod having a bit attached to the tip are integrally connected, and the piston is moved forward and backward by fluid pressure so that the piston is centered on the outer circumference of the piston. A vibrating drill characterized in that a rotary valve that rotates in a circular manner is rotatably provided, and the rotation of the rotary valve alternately switches the pressure fluid to a rear chamber and a front chamber of a piston of a cylinder. 5. The stroke end of the back-and-forth movement of the piston is regulated by switching the pressure fluid by the rotation of the rotary valve to the piston rear chamber and front chamber of the cylinder. Vibration drill. 6. One rotation of the rotary valve causes the cylinder to alternately switch between the rear chamber and the front chamber of the piston a plurality of times, and one rotation of the rotary valve causes the piston to reciprocate a plurality of times. The vibration drill according to claim 3.