JP2660901B2 - Cable storage tube drilling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable receiving tube drilling machine, and more particularly, to a hole for confirming whether or not a cable is present in a cable receiving tube for receiving a telephone line cable or the like. The present invention relates to a cable housing pipe drilling machine used for opening work.

[0002]

2. Description of the Related Art In general, when removing or remodeling a handhole or manhole, it is necessary to check the presence or absence of a cable inside a cable housing pipe before construction. This hole for confirming the cable is to make a small hole in the outer wall of the housing pipe and confirm through the hole whether or not a cable exists inside.

[0003] Conventionally, when drilling such holes in a cable housing tube, a drill system and a hollow mill system have been generally performed. The former presses a drill against the outer wall of the housing pipe to form a hole according to the diameter of the drill, and the latter also presses a rotating hollow mill against the pipe wall to form a hole at the end mill surface.

[0004]

However, although the conventional method can be implemented at low cost, the drill method may cause damage to the cable due to the contact of the drill tip with the housing cable due to the characteristics of the cutting tool. There is a drawback that it is easily affected by the outer diameter, and it is difficult to check the cable depending on the outer diameter. Further, there is a problem that the cutting burrs fly inside due to the tip of the drill, which causes cable damage. On the other hand, in the latter hollow mill method, the tip of the hollow mill is affected by the outer diameter of the housing cable and the hole diameter can be slightly larger than that of the drill method. The same is true. Further, there was a drawback that the cutting burrs fly out into the pipe. Further, in the conventional method, since the drilling torque is given manually, there is a possibility that the blade may fly out at the end of drilling, and the problem of cable damage has not been improved.

SUMMARY OF THE INVENTION The present invention is directed to an automatic drilling machine capable of safely drilling only a pipe wall in a state in which a cable is accommodated, and capable of easily drilling a large-diameter hole for easily checking a cable. The purpose is to provide.

[0006]

In order to achieve the above-mentioned object, a cable-housing pipe drilling machine according to the present invention firstly has a holder for enclosing a pipe housing a cable or the like. The holder is provided with a rotating body that is driven to rotate facing the tube wall, and the rotating body is provided with a plurality of pin cutters that are arranged around the center of rotation and that can be moved in and out toward the outer surface of the housing pipe. A cam for regulating the protruding length is provided so that the tip of the cutter can be brought into contact with the pipe wall surface of the housing pipe on the rotation locus, and an excavation advancing mechanism for driving the cam downward toward the housing pipe is provided.

Second, there is provided a holder for enclosing a tube accommodating a cable or the like, and the holder is capable of moving toward and away from the tube wall and rotatably facing the tube wall, and has a hydraulic chamber therein. A rotating body is provided, and a plurality of pin cutters protruding toward the outer surface of the housing pipe under the hydraulic pressure of the hydraulic chamber of the rotating body are arranged around a rotation center, and the rotating body is directed toward the housing pipe. The excavation advance mechanism that is driven to push down is provided.

[0008]

According to the first configuration, the pin cutter is moved around the cable accommodating tube along the curved surface of the cable accommodating tube while the projecting length of the cable accommodating tube is adjusted by the cam. The cam is gradually advanced in the thickness direction of the pipe wall by the excavation advancing mechanism, and cuts a ring-shaped groove. This excavation depth is fixed by the cam curved surface, and the cam itself pushes down the pin cutter at the same time, so only the pipe wall thickness can be cut, and the blade part does not fly out to the cable housed inside, and There is no problem of damage by the blade.

In the second aspect of the present invention, the force for pressing the pin cutter against the pipe wall is performed by hydraulic pressure, and the plurality of pin cutters press with the same force by receiving the pressure from the hydraulic chamber provided in the rotating body. . According to this, an arbitrary accommodation pipe can be drilled at any time without providing a cam corresponding to the diameter of the target pipe.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cable-housing pipe drilling machine according to the present invention.

FIG. 1 is a partially cutaway perspective view of the pipe drilling machine according to the embodiment in use, and FIGS. 2 to 4 are longitudinal and transverse sectional views. As shown in these drawings, the pipe drilling machine is used for opening a confirmation window hole 14 in a pipe wall of a housing pipe 12 through which the cable 10 can be inserted, and has a holder 16 for enclosing the housing pipe 12. doing. The holder 16 can be divided into upper and lower parts, and the lower holder 16D and the upper holder 16U can be joined and separated by a fastening bolt 18. A main mechanism for drilling is provided on the upper holder 16U side.

A casing 20 is integrally attached to the upper holder 16U, and faces the outer surface of the housing tube 12 inside the housing 20. The rotating body 2 having the diameter axis of the housing tube 12 as the center of rotation.
2 are accommodated. In this embodiment, the rotating body 22 is
As shown in FIG. 3, the worm 2 is engaged with the worm wheel 26 as shown in FIG.
8 to be rotated. Warm 28
Is configured as an output shaft of a gear box 30 attached to the casing 20, and is rotatably driven by an input of a drive motor 32 mounted on the gear box 30. A plurality of cylinders 34 are formed at an equal distance from the center of rotation in the cylinder block 24 at the center of the rotating body, and a pin cutter 36 for cutting is mounted on the cylinder 34 so as to be able to enter and exit from the cylinder block 24 toward the pipe wall. Pink cutter 3
The cylinder 6 is urged upward by a spring 38 inside each cylinder, and the protrusion of the cutter portion is adjusted by the cam surface while the upper surface is held by a solid cam described later. For this reason, when the worm wheel 26 is rotationally driven by the drive motor 32, the cylinder block 24 integrated with the wheel is rotated, and the plurality of pin cutters 36 protruding from the lower surface side are centered on the diameter axis of the housing tube 12. It is configured to make a circular motion along a circular locus.

The rotation trajectory of the pin cutter 36 corresponds to the accommodation tube 1.
2, the cutting depth of the pipe wall is reduced at each position of the rotation trajectory while the pin cutter 36 is in contact with the circular shape of the pipe wall when viewed from the cross section of the pipe.
A solid cam 40 is provided so as to be the same in 6. The solid cam 40 is formed in a cylindrical shape having a diameter corresponding to the orbital circle of the pin cutter 36, and presses the upper end surface of the pin cutter 36 urged upward by the spring 38 and makes sliding contact during its orbital movement to make the lower end cutter A cam surface that follows the curved shape of the housing tube 12 is formed on the contact surface.

The cylindrical solid cam 40 needs to push down the pin cutter 36 as the cutting progresses. Therefore, the cylindrical solid cam 40 is held by a cam housing 42 provided on the outer periphery of the cam 40 so as not to rotate, while the housing pipe 12 is held. It is mounted so as to be able to move in the vertical direction along the diameter axis direction.
That is, as shown in FIG. 5, a mounting hole 44 is formed in the cam housing 42, a solid cam 40 is mounted in the hole 44 via a key 46, and the cam 46 is housed movably up and down using the key 46 as a guide. The solid cam 40 has a cylindrical shape as described above, but is provided with an end plate 48 at the upper end surface, and a screw hole 50 is formed at the center thereof. The feed for excavation progress is performed using the screw holes 50.

The excavation advancing mechanism is a ratchet mechanism in this embodiment, and a ratchet gear 52 is rotatably mounted on the casing 20 in parallel with the cam end plate 48. A feeder screw 54 is fixed to the center of the ratchet gear 52, protrudes toward the solid cam 40, and is screwed into the screw hole 50. For this reason, when the feeder screw 54 is rotated together with the rotation of the ratchet gear 52, the solid cam 40 screwed to the feeder screw 54 is rotated.
Is screwed to move the cam 40 downward. As shown in FIG. 6, the mechanism for rotating the ratchet gear 52 is performed by a feed link mechanism 58 provided with a feed blade 56 that engages with the gear surface of the ratchet gear 52. The feed link mechanism 58 is disposed on the same plane as the ratchet gear 52, and is provided with a swing lever 60 to which the feed blade 56 is attached, a drive lever 62 for swinging the swing lever 60, and a connection connecting the two levers 60, 62. It is constituted by a link 64. The drive lever 62 operates by utilizing the rotational driving force of the pin cutter 36. Therefore, a rotation shaft 66 is attached to the base of the drive lever 62 so as to be orthogonal to the lever swing surface. The rotating shaft 66 extends to a position lateral to the worm wheel 26 of the rotating body. As shown in FIGS. 6 (2) and 6 (3), an operating lever 68 extending along the upper surface of the worm wheel 26 and extending toward the center of rotation is attached to the rotating shaft 66. The operating lever 68 is kicked in the wheel rotation direction by a pin 70 implanted on the upper surface of the worm wheel 26, thereby rotating the rotating shaft 66 only within the pin engagement range. This rotation is transmitted to the drive lever 62, thereby rotating the ratchet gear 52 by a predetermined angle. Operating lever 6
The left and right 8 maintain a neutral position, that is, a direction along the radial direction of the worm wheel 26, by a spring 72, and return to the neutral position after the pin 70 has passed. The pin 70 is provided at one position on the worm wheel 26, and the feed blade 56 feeds the ratchet gear 52 half gear pitch at a time.

The cable-housing pipe drilling machine constructed as described above is used as follows. The holder 16 is attached to the cable accommodating tube 12 and fixed by the fastening bolt 18.
At this time, it is desirable that the inner diameter of the holder 16 matches the outer diameter of the target accommodation tube 12. The operation is started with the holder 16 fixed and the solid cam 40 positioned at the upper end, and the worm wheel 26 inside the casing rotates through the worm 28 by starting the motor 32. The cylinder block 24 at the center is also rotated with the worm wheel 26, and the plurality of pin cutters 36 attached to this rotate in a circular locus. The pin cutter 36 has its lower end protruding toward the outer surface of the housing tube 12. The pin cutter 36 is urged upward by a spring 38 and received by the solid cam 40. Therefore, the amount of projection of the lower end cutter portion is changed according to the shape of the cam surface while the pin cutter 36 performs a circular motion. Since the cam surface is set to coincide with the cross-sectional curved surface of the housing tube 12, the pin cutter 36
The protrusion amount changes so as to follow the cross-sectional curved surface of No. 2.

With the orbital movement of the pin cutter 36, the pin 70 provided on the worm wheel 26 kicks the operating lever 68 every week, whereby the rotary shaft 66 is reciprocated within a certain range. Such reciprocating rotation is transmitted to the swing lever 60 through the drive lever 62 and the connection link 64 of the feed link mechanism 58, and rotates the ratchet gear 52 by the ratchet feed blade 56 by a small angle. The ratchet gear 52 is on the same rotation axis as the solid cam 40, and a feeder screw 54 integrated with the gear 52 is screwed to the cam 40. Therefore, the solid cam 40 is gradually driven downward by the rotation of the ratchet gear 52. With the lowering of the solid cam 40,
The plurality of pin cutters 36 rotating while sliding on the lower end cam surface come into contact with the tube wall of the housing tube 12 and perform cutting while following the tube wall shape. The pin cutter 36 performs ring-shaped cutting in order to orbit the circular locus, and does not protrude into the pipe even if the cutting depth becomes deep as shown in FIGS. 7 (1) and 7 (2). When the cutting at the depth of the pipe wall thickness is completed, the central circular pipe wall is removed by ring-shaped excavation, and the large-diameter confirmation window hole 14 is opened. The time required during this time is about 2 minutes.

According to such an embodiment, the pin cutter 3
6, a large-diameter opening can be bored by drilling, and the tip bite of the pin cutter 36 is not protruded into the housing pipe 12 during the excavation. 10 is prevented from being damaged by the cutter.

Next, FIGS. 8 and 9 show a second embodiment. This is different from the first embodiment in that the pin cutter 36 is configured to adjust the amount of protrusion along the pipe wall shape by the solid cam 40. On the other hand, the pin cutter 36 is formed into a ring shape following the curved shape of the housing pipe 12 by hydraulic pressure. The difference is that the groove is excavated and drilled. That is, the cylinder block 24 to which the pin cutter 36 is mounted is mounted so as to rotate together with the worm wheel 26, but is movable along the rotation axis. Thereby, the cylinder block 24 can be moved toward and away from the housing tube 12. A hydraulic chamber 74 is provided inside the cylinder block 24, to which the plurality of cylinders 34 are communicated.
The inside is filled with hydraulic oil at a predetermined pressure, and the hydraulic pressure is set so as to act commonly on the upper surfaces of the pin cutters 36. A mounting block 76 is disposed on the upper surface of the cylinder block 24, and the ratchet gear 5
2, a feeder screw 54 attached thereto is screwed. Other configurations are the same as in the first embodiment.

According to the second embodiment, the cylinder block 24 is rotated by the rotation of the worm wheel 26 and, at the same time, is gradually lowered by the fixed angle rotation of the ratchet gear 52. The lower end of the cylinder block 24 causes the tip of the pin cutter 36 to come into contact with the outer peripheral surface of the housing tube 12, but all the pin cutters 36 come into contact with the same pressure. During the rotation of the pin cutter 36, the hydraulic chamber 74
9, the same pressing force is applied to the cutter part, so that the amount of protrusion of the cutter part is automatically adjusted according to the shape of the housing tube 12, and as shown in FIGS. A ring-shaped digging groove with the same digging depth is formed according to
Finally, the drilling is completed.

In the second embodiment, since the pin cutter 36 is adjusted by the pressure from the hydraulic chamber 74 so that the pin cutter 36 has the same contact pressure without adjusting the excavation depth by using the cam 40 in particular, the housing pipe There is obtained an advantage that it can automatically follow the shape of the 12 curved surfaces and can quickly cope with different diameter storage tubes.

[0022]

As described above, the cable-housing pipe drilling machine according to the present invention adjusts the amount of projection of the pin cutter in accordance with the curved surface of the housing pipe while moving the plurality of pin cutters around the same. It does not protrude into the housing pipe during the hole work. Therefore, an excellent effect that the occurrence of a cable damage accident due to the drilling operation can be effectively prevented can be obtained. In addition, the ring-shaped excavation groove is cut and opened by moving the pin cutter orbitally, so that a large-diameter opening window hole can be made, and it is easy to confirm the presence or absence of a cable.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a cable housing pipe drilling machine according to a first embodiment in use.

FIG. 2 is a side sectional view of the cable-housing pipe drilling machine.

FIG. 3 is a plan sectional view of the cable-housing pipe drilling machine.

FIG. 4 is a longitudinal sectional view of the cable-housing pipe drilling machine.

FIG. 5 is an exploded perspective view of a main part of the cable housing pipe drilling machine.

FIG. 6 is an explanatory diagram of an excavation progress mechanism of the cable-housing pipe drilling machine.

FIG. 7 is an explanatory view of a state of excavation by the cable-housing pipe drilling machine.

FIG. 8 is a longitudinal sectional view of a cable-housing pipe drilling machine according to a second embodiment.

FIG. 9 is an explanatory diagram of a state of excavation by the cable-housing pipe drilling machine of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cable 12 Housing pipe 14 Window for confirmation 16 Holder 16U Upper holder 16D Lower holder 18 Fastening bolt 20 Casing 22 Rotating body 24 Cylinder block 26 Warm wheel 28 Worm 30 Gear box 32 Drive motor 34 Cylinder 36 Pin cutter 38 Spring 40 Solid cam 42 Cam housing 44 Mounting hole 46 Key 48 End plate 50 Screw hole 52 Ratchet gear 54 Feeder screw 56 Feed blade 58 Feed link mechanism 60 Swing lever 62 Drive lever 64 Connection link 66 Rotary shaft 68 Actuation lever 70 Pin 72 Spring 74 Hydraulic chamber 76 Mounting block

Claims (2)

(57) [Claims] A holder for enclosing a tube accommodating a cable or the like is attached to the holder, and a rotating body that is driven to rotate facing the wall of the tube is attached to the holder, and the rotating body is provided around the rotation center thereof. A plurality of pin cutters which are arranged at a position that can be moved in and out toward the outer surface of the housing tube, and a cam that regulates a protrusion length so that the tip of the cutter can be brought into contact with the tube wall surface of the housing tube on the rotation trajectory of these pin cutters. A cable housing pipe drilling machine provided with an excavation advancing mechanism for driving the cam downwardly toward the housing pipe. 2. A rotating device having a holder for enclosing a tube accommodating a cable or the like, wherein the holder is capable of moving toward and away from the tube wall and rotatably driven facing the tube wall and having a hydraulic chamber formed therein. And a plurality of pin cutters protruding toward the outer surface of the housing pipe receiving the hydraulic pressure from the hydraulic chamber of the rotating body, are arranged around the center of rotation, and the rotating body is pressed down toward the housing pipe. A cable housing pipe drilling machine provided with an excavation advancing mechanism.