JP2011069137A - Drilling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simplified drilling device which drills a connection part of a branch pipe while being introduced to the small-diameter main pipe of a pipeline or the main pipe of the pipeline having a larger diameter. <P>SOLUTION: The drilling device includes: an extension/contraction drive part 3 having a multistage extension/contraction rod 3R comprising a plurality of rod components 31, 32 arranged tandemly in an extensible/contractable manner; a rotary drive part 5 fitted to the front end of the extension/contraction rod 3R; and a cutting tool 6 mounted to a rotation output shaft 5a of a rotary drive part 5. The extension/contraction drive part 3 is supported to be swingable around an axis 12a orthogonal to the extension/contraction direction of the extension/contraction rod 3R. The extension/contraction drive part 3 is a pneumatic actuator having a cylinder body 3C for housing the extension/contraction rod 3R in a contracted state and having such a structure that the extension/contraction rod 3R is extended by introducing the compressed air into the cylinder body 3C. The cylinder body 3C is provided with an entrance port 33 for introducing the compressed air thereinto. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drilling device used in a pipeline such as a sewer pipe, and particularly, when repairing an aged pipeline, opens a connecting portion of a branch pipe that is blocked by a lining material applied in the pipeline. The present invention relates to a perforation apparatus used for the above.

  When pipes such as sewer pipes buried in the ground have deteriorated, it is well known to repair the old pipe by forming a hard coating layer on its inner wall without excavating it and replacing it. Yes, pipe repair work by this method is generally performed widely.

  Such a construction method uses a pipe lining material in which a thermosetting resin is impregnated into a tubular resin absorbent material whose outer peripheral surface or both inner and outer peripheral surfaces are coated with a plastic film, and this is applied to the pipe line by the pressure of fluid such as water or air. After being inverted and inserted into the tube, the thermosetting resin impregnated in the resin absorbent material is cured by replacing the fluid with warm water while the tube lining material is pressed against the inner wall of the pipeline with fluid pressure, Thus, a hard coating layer made of a pipe lining material is formed on the inner wall of the pipe.

  Here, in the pipe lining method as described above, for example, when the main pipe of the sewer is lined, the connecting part of the branch pipe to the main pipe is blocked by the lining material. The perforated device is used to perforate the connecting portion of the branch pipe to communicate the branch pipe with the main pipe.

  Conventionally, as such a drilling device, a hydraulic cylinder that expands and contracts in a direction perpendicular to the length direction of the pipe line is attached to a pipe working robot introduced into the pipe main pipe, and a hydraulic motor is connected to the rod part. In addition, the one having a cutter attached to the output shaft is known (for example, Patent Document 1).

JP-A-6-297318

  However, according to the conventional pipe drilling device disclosed in Patent Document 1, the branch pipe connected to the upper part of the main pipe is cut to the connection portion of the branch pipe to be drilled. The tool may not reach and therefore the part may not be drilled. This is due to the short stroke of the rod part of the hydraulic cylinder.If the main pipe diameter increases, the branch pipe connection portion also increases accordingly. It becomes impossible to cope. If a fluid pressure cylinder having a large stroke corresponding to the main pipe having a large diameter is used, the cylinder body is correspondingly lengthened. Therefore, there is a problem that it becomes impossible to introduce a perforating apparatus to the main pipe having a small diameter.

  For this reason, conventionally, several types of drilling devices are prepared corresponding to the diameter of the main pipe, and the cost for the purchase and maintenance is a heavy burden.

  The present invention has been made in view of the circumstances as described above. The purpose of the present invention is to introduce a single perforation device into a main pipe having a small diameter or a pipe main having a larger diameter. An object of the present invention is to provide a simple drilling device capable of drilling a connecting portion of a branch pipe.

In order to achieve the above object, a perforating apparatus according to the present invention comprises:
A telescopic drive unit having a multistage telescopic rod formed by serially joining a plurality of rod constituent members in a telescopic manner, a rotational drive unit attached to the tip of the telescopic rod, and a rotational output shaft of the rotational drive unit. Cutting tool and
The telescopic drive unit is supported so as to be swingable about an axis orthogonal to the telescopic direction of the telescopic rod.

  In addition, the telescopic drive unit is a pneumatic actuator having a cylinder body that houses the telescopic rod in a contracted state, and the telescopic rod extends by introducing compressed air into the cylinder body. The cylinder body is provided with an inlet port for introducing compressed air therein.

  Further, the present invention is characterized in that it includes a telescopic support leg that supports a reaction force acting on the telescopic rod when the cutting tool is pressed against an object to be drilled.

  According to the present invention, since the telescopic rod of the telescopic drive unit has a multistage structure, the stroke at the time of expansion can be increased while shortening the overall length at the time of reduction. For this reason, even in a large-diameter pipe main pipe where the connecting part of the branch pipe becomes high, the portion can be drilled while pressing the cutting tool against the connecting part of the branch pipe by extension of the telescopic rod. Since the telescopic drive unit having the rod is supported so as to be swingable about an axis perpendicular to the expansion / contraction direction of the expansion / contraction rod, the expansion / contraction rod can be oriented in the direction in which the connecting portion of the branch pipe to be drilled is located.

  In addition, since the expansion / contraction drive is a pneumatic actuator, there is no risk of hydraulic oil leaking into the pipeline when used as in the hydraulic type, and even if flammable gas is generated in the pipeline, an explosion accident occurs. Can be prevented.

  In addition, when the cutting tool is pressed against the drilling object, it is equipped with support legs that support the reaction force acting on the telescopic rod from the cutting tool. Can be done.

Side view showing a perforating apparatus according to the present invention. Front view of the device Partial sectional view showing the main part of the device Block diagram showing an example of pneumatic circuit Explanatory drawing which shows the use aspect of the drilling apparatus which concerns on this invention Explanatory drawing showing usage in small diameter main pipe Explanatory drawing showing usage in large diameter main pipe Schematic cross section showing an example of changing the telescopic drive

  Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings. First, the overall configuration of the drilling apparatus according to the present invention will be outlined with reference to FIGS. 1 and 2. Reference numeral 1 denotes an in-pipe working robot with a wheel introduced into the pipe line, and the upper end of the pipe has an inside of the pipe line. A camera 11 for photographing is attached.

  In addition, a swing actuator (in this example, a pneumatic motor 12) having a rotation output shaft 12a that can be rotated in the forward and reverse directions directed in the length direction of the pipe is incorporated in the distal end portion of the in-pipe working robot 1. Yes. The rotation output shaft 12a of the pneumatic motor 12 is coupled to a shaft coupling 13, and the shaft coupling 13 is rotatably supported by a bearing unit 14 fixed to the in-pipe work robot 1.

  On the other hand, 2 is a detachable bracket fastened to the tip of the shaft coupling 13 with a bolt or the like, and the telescopic drive unit 3 is mounted and fixed to the bracket 2. The telescopic drive unit 3 has a multistage telescopic rod 3R that can perform an expansion / contraction operation, and is attached to the bracket 2 in a state in which the expansion / contraction direction is orthogonal to the rotation output shaft 12a of the pneumatic motor 12. That is, the telescopic drive unit 3 is supported so as to be swingable in the left-right direction around the rotation output shaft 12a of the pneumatic motor 12, and the tip of the telescopic rod 3R is directed to the inner wall surface of the pipe in the pipe. Is done.

  In addition, a rotation drive unit (in this example, a rotary actuator including a pneumatic motor 5) is attached to the distal end of the telescopic rod 3R via a connecting arm 4. The pneumatic motor 5 has a rotation output shaft 5a parallel to the expansion / contraction direction of the expansion / contraction rod 3R, and a cutting tool 6 is mounted on the rotation output shaft 9a.

  In this example, the cutting tool 6 is a conical drill, but instead of this, a diamond cutter in which diamond abrasive grains are fixed to a substrate made of metal, carbon, or the like, or a blade portion at the edge of a cylindrical body. A formed hole saw or the like can also be suitably used.

  1 and 2, reference numeral 7 denotes a support leg provided on the bottom surface of the bracket 2, and the support leg 7 is a columnar part 71 which is adjustable in length and a lower part (column base part). The slide shoe 72 is bent at both ends upward.

  Next, the structure of the main part of the drilling apparatus according to the present invention will be described with reference to FIG. 3. The telescopic drive part 3 constituting the main part is a single-acting pneumatic actuator in which the expansion rod 3R is extended by air pressure. The telescopic rod 3R is formed by serially joining a plurality of (two in the illustrated example) rod constituent members 31 and 32 having different diameters so as to be telescopic. In other words, the rod constituent members 31 and 32 are fitted in series so as to be stretchable on the same straight line. The rod constituent members 31 and 32 are rigid metal cylinders, and upper flanges 31a and 32a and lower flanges 31b and 32b are formed on the outer circumferences of both ends thereof.

  Further, as shown by the solid line in FIG. 3, the telescopic drive unit 3 includes a cylinder body 3C that accommodates the telescopic rod 3R in a contracted state. The cylinder body 3C is a metal cylinder having a larger diameter than the maximum diameter portion of the telescopic rod 3R (the lower flange 32b of the rod constituent member 32), and an inlet port 33 into which compressed air is taken is formed in the lower peripheral surface. ing.

  According to the telescopic drive unit 3, when compressed air is introduced into the cylinder body 3 </ b> C from the inlet port 33, the air pressure acts on the inner front end surface of the rod constituent member 31 (hereinafter referred to as the front end rod). The distal end rod 31 is extended, and then the lower flange 31b is locked to the inner distal end edge of the second stage rod constituent member 32, whereby the rod constituent member 32 is pushed out from the cylinder body 3C, and the lower flange 32b is The extension stroke becomes maximum when the cylinder body 3C is locked to the inner front end edge of the cylinder body 3C.

  When the telescopic rod 3R is reduced, the upper flange 32a of the rod constituent member 32 is engaged with the outer front end edge of the cylinder body 3C, and the upper flange 31a of the front end rod 31 is engaged with the outer front end edge of the rod constituent member 32. As a result, an airway leading from the inlet port 33 to the inside of the distal end rod 31 is secured. As is clear from FIG. 3, the bracket 2 is formed with a ventilation path 2a communicating with the inlet port 33, and the ventilation path 2a and the compressed air supply source are connected by a flexible tube (not shown). It is said that.

  Further, as is clear from FIG. 3, the support column 71 of the support leg 7 is composed of a hollow shaft 71a communicating with the inner bottom of the cylinder body 3C and a piston rod 71b inserted into the hollow shaft 71C. The strut portion 71 is also extended when compressed air is introduced into the cylinder body 3C in order to extend. The support column 71 is always in an extended state upon receiving an axial force in the extending direction from the slide shoe 72, but when the compressed air is introduced into the cylinder body 3C, the cutting tool 6 is subject to drilling due to the extension of the telescopic rod 3R. The reaction force when pressed against an object can be supported.

  FIG. 4 shows an example of a pneumatic circuit that operates pneumatic equipment including the telescopic drive unit 3. In FIG. 4, Ac is a compressed air supply source (air compressor), P is an air flow path connecting the air compressor Ac, the pneumatic motors 5 and 12, and the telescopic drive unit 3 as a pneumatic actuator. Is a flexible tube P1 connected to the primary side of the pneumatic motor 12, a flexible tube P2 connected to the secondary side thereof, a flexible tube P3 connected to the telescopic drive unit 3, and a flexible tube P4 connected to the pneumatic motor 5. It is comprised including. Af is an air filter interposed in the air flow path P, V1 to V3 are direction switching valves, and these direction switching valves V1 to V3 all block the air flow path P when not energized. Among these, the direction switching valve V1 can switch the supply of compressed air to the primary side and the secondary side of the pneumatic motor 12 when energized, and the corresponding pneumatic motor 12 supplies air to the primary side. Forward rotation and reverse rotation by supplying air to the secondary side.

  On the other hand, the direction switching valve V2 enables supply of compressed air to the expansion / contraction drive unit 3 when energized. The expansion / contraction drive unit 3 corresponding to the direction switching valve V2 receives the compressed air and expands. When not energized, it receives a compressive load from the cutting tool 6 and shrinks while releasing compressed air to the outside.

  The direction switching valve V3 enables supply of compressed air to the pneumatic motor 5 when energized, and the corresponding pneumatic motor 5 receives the compressed air and rotates in one direction to cut the cutting tool. 6 is rotated.

  Next, if the usage pattern of the present device configured as described above is described, the perforating device is introduced into the main pipe Mp of the sewer as illustrated in FIG. As shown in FIG. 5, the main pipe Mp is lined in advance by a pipe lining material L, and the connecting portion of the branch pipe Sp to the main pipe Mp is closed by the pipe lining material L. Therefore, the perforating apparatus is used to cut the pipe lining material L that closes the connecting portion of the branch pipe Sp (hereinafter referred to as a perforating position) and to connect the branch pipe Sp to the main pipe Mp.

  Here, the perforating apparatus is drawn into the main pipe Mp by the wire rope W connected to the in-pipe work robot 1. The flexible pipes P1 to P4 are pulled out from a manhole (not shown) together with the wire rope W to the ground, and the operation devices including the direction switching valves V1 to V3 and the air compressor Ac are installed on the ground. Thus, the image taken by the camera 11 provided in the in-pipe work robot 1 and the camera C introduced into the branch pipe Sp is projected on the ground monitor, and the cutting tool 6 is directly opposed to the drilling position while watching this. Let

  The direct positioning of the cutting tool 6 with respect to the drilling position is performed by remotely operating the pneumatic motor 12 from the ground, and thereafter, compressed air is supplied to the telescopic drive unit 3. When compressed air is supplied to the telescopic drive unit 3, the telescopic rod 3R expands and the cutting tool 6 is pressed against the drilling position, and the reaction force acts on the telescopic rod 3R. 7 is also extended, and a slide shoe 72 at the lower end thereof is crimped to the inner wall of the main pipe Mp on the opposite side of the cutting tool 6 as shown by a one-dot chain line in FIG. The in-pipe work robot 1 is prevented from being tilted in the main pipe Mp because the pipe 7 is supported.

  Accordingly, it is possible to drill the drilling position while supplying the compressed air to the pneumatic motor 5 and rotating the cutting tool 6 while applying the pressure of the compressed air to the telescopic drive unit 3. In particular, according to the perforating apparatus according to the present invention, since the expansion rod 3R of the expansion / contraction drive unit 3 has a multi-stage structure, the stroke at the time of expansion can be increased while shortening the entire length at the time of reduction, as shown in FIG. Moreover, it can introduce | transduce into the main pipe Mp whose diameter is larger than the main pipe Mp shown in FIG.

  Although a preferred example of the present invention has been described above, the perforating apparatus is not limited to the above configuration, and the in-pipe work robot 1 may be self-propelled, for example. Further, the swing actuator built in the in-pipe work robot 1 and the rotary actuator that rotationally drives the cutting tool 6 are not limited to the pneumatic motor, and a hydraulic motor or an electric motor can also be used for this. In particular, when a fluid pressure motor such as the pneumatic motor 12 or the hydraulic motor as described above is used as the swing actuator, the positioning of the cutting tool 6 becomes difficult. A control motor can be suitably used.

  On the other hand, the expansion / contraction drive unit 3 is not limited to a pneumatic actuator, but employs an electric expansion / contraction mechanism in which a multistage expansion / contraction rod expands / contracts by forward / reverse drive of an electric motor (electric motor), such as a known electric vehicle pole. be able to. In this type of electric telescopic mechanism, a flexible linear body is passed through a multistage telescopic rod, and its tip is locked inside the tip rod, which is rotated by an electric motor. The telescopic rod expands and contracts by winding it around a drum or unwinding it.

  Here, the telescopic rod 3R is not limited to the two-stage type in which the two rod constituent members 31 and 32 are connected in series, but may be three or more stages, and the tip rod 31 of each rod constituent member 31 and 32 is hollow. Not limited to this, a solid shaft provided with a lower flange 31b (piston) as shown in FIG. 8 may be used.

  Further, as the support leg 7, a fluid pressure cylinder capable of independent expansion / contraction operation may be used separately from the expansion / contraction drive unit 3, or a screw shaft whose length can be adjusted by a rotation operation may be used.

1 In-pipe work robot 12 Oscillating actuator (pneumatic motor)
12a Rotation output shaft (Oscillation center of telescopic drive unit)
DESCRIPTION OF SYMBOLS 3 Telescopic drive part 3R Telescopic rod 31 Rod structural member 32 Rod structural member 33 Inlet port 3C Cylinder cylinder 5 Rotation drive part (pneumatic motor)
5a Rotation output shaft 6 Cutting tool 7 Support leg 71 Post unit 72 Slide shoe

Claims (3)

A telescopic drive unit having a multistage telescopic rod formed by serially joining a plurality of rod constituent members in a telescopic manner, a rotational drive unit attached to the tip of the telescopic rod, and a rotational output shaft of the rotational drive unit. Cutting tool and
The expansion / contraction drive unit is supported so as to be swingable about an axis orthogonal to the expansion / contraction direction of the expansion / contraction rod. The telescopic drive unit is a pneumatic actuator having a cylinder body for accommodating the telescopic rod in a contracted state, and extending the telescopic rod by introducing compressed air into the cylinder body. 2. The perforating apparatus according to claim 1, further comprising an inlet port for introducing compressed air therein. The drilling device according to claim 1, further comprising an extendable support leg that supports a reaction force acting on the telescopic rod when the cutting tool is pressed against an object to be drilled.

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