JP6271255B2 - Tool insert - Google Patents

Description

  The present invention relates to a tool insertion tool for inserting a tool such as a gas bag for closing a gas pipe into a pipe.

  In general, a gas bag for closing the gas pipe when piping the gas pipe, a camera for inspecting the inside of the pipe, a gyroscope for measuring the placement angle and position of the pipe, and the wall thickness of the pipe A tool such as an ultrasonic probe for measuring a wire has a structure in which linear bodies such as various wires and piano wires for insertion / extraction operations are extended from the tool body to the rear. Used by inserting into the pipe from the end opening.

  However, when a tool is inserted through a projection inside the pipe, particularly a step near the elbow pipe, the tool body may be caught by the projection or the step, making it difficult to insert the tool.

  On the other hand, Patent Document 1 has a coil shape in which the wire 101 is formed in a spiral shape, and the front side portion thereof is a main body housing portion 102, and the extended portion behind the main body housing portion 102 is housed in a linear body. The tool insertion tool which made the part 103 is disclosed (refer FIG. 7).

  The tool insertion tool disclosed in Patent Document 1 accommodates a tool main body in the main body accommodating portion 102, accommodates a linear body in the linear body accommodating portion 103, and pushes in with the linear body accommodating portion 103. The main body housing portion 102 can be inserted into the body. Further, the main body accommodating portion 102 is configured in a spiral shape with a gap in the central axis direction of the wire 101, and when inserted while being bent along the inner surface of the elbow pipe, The main body accommodating portion 102 can be easily bent by absorbing the bending deformation.

JP 2013-134154 A (paragraph numbers 0020, 0022, 0023, 0025 to 0027, FIG. 1)

  However, since the tool insertion tool of Patent Document 1 has a gap in the central axis direction of the spiral wire constituting the main body housing portion, the main body housing portion can be easily bent along the curve of the piping. Although it is possible, when the tool insertion tool is pushed into the pipe with a stronger force, the main body housing portion may be deformed in the central axis direction, making it difficult to transmit the force.

  An object of this invention is to provide the tool insertion tool which can be easily bent along the curved part of piping, and can be reliably transmitted and inserted in piping.

In order to achieve the above object, a tool insertion tool according to the present invention is for inserting a tool having a tool main body and a linear body extending rearward from the tool main body into a pipe. The coil is formed into a spiral shape, and the winding diameter of the spiral wire is set to a large diameter to constitute a main body accommodating portion for accommodating the tool main body, and an extension extending rearward from the main body accommodating portion In this part, the winding diameter of the spiral wire rod is set to a small diameter to constitute a linear body housing portion that houses the linear body. Furthermore, the main body accommodating portion can be loaded with the frictional force between the main body accommodating portion and the inside of the pipe as a central axial force, and the interval between the adjacent portions in the central axial direction of the helical wire is determined by the main body. It is set smaller on the rear side than on the front side of the housing portion.

  According to the above configuration, the tool insertion tool is coiled, and the winding diameters of the front side portion and the rear extension portion are set to different diameters to form the main body accommodation portion and the linear body accommodation portion. The tool to be inserted can be housed inside the tool inserter for protection. This tool insertion tool can move the tool main body accommodated in the main body accommodating portion inside the pipe by pushing and pulling the linear body accommodating portion from the outside of the end opening of the pipe. Therefore, the tool can be inserted by bending it along a curved shape such as an elbow tube.

  In addition, since the interval between the helical wires constituting the main body accommodating portion is set smaller on the rear side than on the front side, the front portion of the main body accommodating portion that guides the tool insertion tool in the tube follows the curved shape of the tube. It can be easily bent. On the other hand, for the rear side portion of the main body housing portion where the force acting in the central axis direction becomes larger, the deformation in the central axis direction is suppressed and the pushing force received from the linear body housing portion is easily transmitted to the front side portion. Can do.

  More specifically, a frictional force acts between the tool insertion tool inserted into the tube and the inner peripheral surface of the tube, and this frictional force is accumulated from the front end of the main body housing portion toward the rear side to be centered. Since it is an axial force, the central axial force on the front side of the main body housing portion is relatively small, and the central axial force on the rear side of the main body housing portion is relatively large.

  Therefore, the front side portion of the main body housing portion can be easily bent by increasing the space between the wires because the force in the central axis direction is small and is not easily deformed in the central axis direction. The insertion tool can be easily guided. On the other hand, with respect to the rear portion of the main body accommodating portion, the pushing force can be easily transmitted to the front portion by reducing the distance between the wire rods and suppressing the deformation in the central axis direction because the force in the central axis direction is large. In this case, the rear portion of the main body housing portion is increased in rigidity against the amount corresponding to the reduction in the interval between the wires. However, when the main body housing portion enters the bending portion, the rear portion is easily bent by being guided by the front side portion. To do.

  Further, the main body housing portion has a coil shape in which the front side portion is formed in a spiral shape with a gap in the central axis direction, and the rear side portion is formed in a coil shape in which the wire material is formed in a spiral shape without any gap in the central axis direction. You may make it form.

  According to this configuration, since a gap is formed between the wires in the front portion of the main body housing portion, the front portion of the main body housing portion can be easily bent by absorbing bending deformation in the gap. Moreover, since the wire rod in the rear part of the main body housing part is spirally formed in the central axis direction without gaps, deformation of the rear part in the central axis direction can be suppressed as much as possible, and the pushing force can be reliably transmitted to the front part. it can.

  Furthermore, you may make it set a main body accommodating part longer than the center-axis direction length of the curved part of the pipe | tube which inserts this tool insertion tool.

  According to this configuration, since the main body housing portion is longer than the length in the central axis direction of the bending portion of the tube, when the main body housing portion passes through the bending portion such as an elbow pipe, the front end of the main body housing portion is the bending portion of the tube. Until the complete passage of the wire body, the linear body housing portion behind the body housing portion is prevented from entering the curved portion of the tube, and the pushing force is stably transmitted to the center of the body housing portion. The insertion tool can be reliably inserted.

  That is, when a linear body housing portion having a smaller winding diameter than the main body housing portion is caused to enter the curved portion of the tube and a pushing force is applied, the linear body housing portion is greatly displaced to the outside of the curved shape within the tube. The pushing force applied from the cylindrical body accommodating portion is shifted to the outside of the curved shape with respect to the central axis of the main body accommodating portion. On the other hand, by making the main body accommodating portion longer than the length in the central axis direction of the curved portion of the tube, the linear body until the front end of the main body accommodating portion leading inside the tube has completely passed through the curved portion of the tube. A pressing force can be stably transmitted from the housing portion to the center of the main body housing portion, and the tool insertion tool can be reliably inserted.

  The present invention also provides a method for inserting a tool into a tube using the tool insertion tool described above. Specifically, the tool is accommodated in the tool insertion tool, and the tool is inserted into the tube together with the tool insertion tool while rotating the tool insertion tool around the central axis.

  According to this configuration, the same effect as that obtained by adopting the configuration of the tool insertion tool described above can be obtained. Further, when there is a protrusion in the tube, the wire material constituting the main body accommodating portion can get over the protrusion in the tube by the principle of screw by rotating the coil-shaped tool insertion tool around the central axis. Moreover, since the coil-shaped main body accommodating portion meshes with the protrusion in the tube to obtain a propulsive force based on the principle of the screw, even when the elbow tube is passed by bending the main body accommodating portion, the tool can be inserted. Can be made easier.

  In addition, when the tip of the wire constituting the main body accommodating part is caught by a protrusion in the pipe, the tool inserter is further rotated around the central axis while the tip of the wire is deformed, and the hook is removed and the wire is also removed. You can jump over the protrusion at a stretch by jumping the tip part of.

  As described above, according to the present invention, the tool insertion tool is configured in a coil shape, and the space between the spiral wire rods is set to be large on the front side of the main body housing portion, thereby leading the tool insertion tool in the tube. Is easily bent along the curved shape of the tube. In addition, by setting the space between the helical wires small on the rear side of the main body housing portion, the deformation in the central axis direction of the rear portion where the central axial force becomes larger is suppressed and received from the linear body housing portion. The pushing force is easily transmitted to the front part. Thereby, a tool insertion tool can be easily bent along the curved part of piping, and can be reliably transmitted and inserted in piping.

Side view of the tool insert according to the present invention Enlarged view of the main part of the tool insertion tool Diagram explaining the behavior of the tool insertion tool inserted into the tube Perspective view of piping to insert tool insertion tool Vertical section of piping with tool insert Horizontal section of piping with tool insert Figure showing a conventional tool insertion tool

  Hereinafter, the form for implementing the tool insertion tool concerning the present invention is explained using a drawing.

  As shown in FIGS. 1 and 2, a tool insertion tool 1 is used for inserting a tool having a tool body and a linear body extending rearward from the tool body into a pipe 2 such as a gas pipe. For example, the wire 3 having a flat cross-section, such as a spring steel wire, is formed in a spiral shape, and the surface thereof is formed into a coil shape that is lubricated as necessary. The front end portion of the tool insertion tool 1 is configured with a main body housing portion 4 for housing the tool main body with the winding diameter of the spiral wire 3 set to a large diameter, and extends rearward from the main body housing portion 4. In the extended portion, a linear body accommodating portion 5 is configured to accommodate the linear body by setting the winding diameter of the spiral wire rod 3 to a small diameter.

  The main body accommodating portion 4 is formed in a coil shape in which the front side portion 6 is helically formed with a gap (P) in the central axis direction of the wire 3, and the rear side portion 7 has a gap in the central axis direction of the wire 3. Instead, the coil is formed in a spiral shape. The gap (P) of the wire 3 in the front portion 6 of the main body housing portion 4 can be appropriately set according to the bending performance required for the main body housing portion 4.

  The length (L0) of the main body accommodating portion 4 is set to be longer than the length in the central axis direction of the curved portion 8 of the pipe 2 into which the tool insertion tool 1 is inserted, and is ½ the length (L0 / 2) on the front side thereof. ) Is the front portion 6 and the rear half length (L0 / 2) is the rear portion 7.

  The linear body housing portion 5 has a smaller diameter than the main body housing portion 4 and has a coil shape in which the wire 3 is spirally formed in the central axis direction without a gap, and is continuous backward from the main body housing portion 4 via the tapered portion 9. Is formed.

  The length (L1) of the linear body housing part 5 is set to be sufficiently longer than the length (L0) of the main body housing part 4 so that the main body housing part 4 can be inserted from the opening of the pipe 2 to the back. The length (L2) of the tapered portion 9 is set to a length sufficient to smoothly transmit force from the small-diameter linear body housing portion 5 to the large-diameter main body housing portion 4.

  The tool to be inserted using the tool insertion tool 1 is, for example, a gas bag for closing the gas pipe at the time of piping work of the gas pipe. The tool body of the gas bag includes, for example, a balloon that can be inflated by remote control. By inserting the tool body into the gas pipe and inflating the balloon, the gas pipe is closed to block the gas flow. . The linear body of the gas bag is a sufficiently long tube, and the tool body is operated from the outside of the gas pipe by an operation portion provided at the rear end thereof.

  Next, the behavior of the main body housing portion 4 when the tool insertion tool 1 is inserted into the pipe will be described.

  First, as shown in FIG. 3A, when the tool insertion tool 1 is inserted and pushed into the pipe 2, one surface in the radial direction of the main body housing portion 4 slides on the inner peripheral surface 2 a of the pipe 2. Frictional force (F) acts. The frictional force (F) is accumulated from the front end of the main body housing portion 4 toward the rear side, and becomes a central axial force (N) acting on each part of the main body housing portion 4.

  In the front side portion 6 of the main body housing portion 4, since the frictional force (F) is not sufficiently accumulated, the central axial direction force (N) is relatively small, and the front side portion 6 has a gap ( Even the structure provided with P) is not excessively deformed in the central axis direction. On the other hand, in the rear portion 7 of the main body housing portion 4, the frictional force (F) is sufficiently accumulated, so that the central axial force (N) is relatively large. It has a spiral structure with no gaps, and deformation in the central axis direction is minimized.

  As shown in FIG. 3 (b), the frictional force (F) acts eccentrically by (d / 2) with respect to the central axis of the main body housing portion 4, thereby applying a moment (M) to the main body housing portion 4. It is made to act, and it tries to bend the main body accommodating part 4 to the side to which a frictional force (F) acts.

  Further, as shown in FIG. 3C, when the main body accommodating portion 4 is pushed into and passes through the bending portion 8 of the pipe 2, the main body accommodating portion 4 is opposed to the curved outer surface of the inner peripheral surface of the bending portion 8. And the frictional force (F) acts on the outside of the curved shape. As described above, the frictional force (F) tends to bend the main body accommodating portion 4 to the acting side, so that the main body accommodating portion 4 is bent to the opposite side of the curved shape of the bending portion 8.

  On the other hand, the main body accommodating portion 4 is forced to receive a reaction force (R) from the curved outer surface of the inner circumferential surface of the bending portion 8 when passing through the bending portion 8 of the pipe 2. Curved. That is, the reaction force (R) resists the rigidity of the main body housing portion 4 with respect to its own bending and the opposite moment (M) due to the frictional force (F). Forcibly bend along the curved shape.

  When the reaction force (R) curves the main body housing portion 4, a moment (M) in the opposite direction due to the frictional force (F) acts at the same time, but in the front portion 6 of the main body housing portion 4, the distance between the wires 3 is Since the rigidity against bending is relatively small, the force required to bend the front portion 6 of the main body housing portion 4 along the bending portion 8 is not excessively increased.

  On the other hand, in the rear portion 7 of the main body housing portion 4, the rigidity against bending increases as the distance between the wires 3 is made relatively small, but the rear side from the position where the reaction force (R) acting on the front portion 6 acts. Since the distance to the portion 7 is long, a relatively large moment acts on the rear portion 7 due to the reaction force (R), and the rear portion 7 of the main body accommodating portion 4 is easily curved. That is, the rear portion 7 of the main body housing portion 4 easily curves along the curved portion 8 by following the curvature of the front portion 6.

  Next, a tool insertion method for inserting a tool into the pipe 2 shown in FIG. 4 using the tool insertion tool 1 will be described.

  First, the tool body is housed in the body housing portion 4 of the tool insertion tool 1 and the linear body is housed in the linear body housing portion 5.

  The main body accommodating portion 4 of the tool insertion tool 1 is inserted into the pipe 2 shown in FIG. 4 from the upper end opening thereof, and is pushed in by holding the rear end portion of the linear body accommodating portion 5. The front end is inserted into the first elbow pipe 10.

  By further pushing the tool insertion tool 1, the front side portion 6 of the main body housing portion 4 is inserted while being curved along the inner surface of the first elbow pipe 10. At that time, since the wire 3 of the front portion 6 is formed in a spiral shape with a gap (P) in the central axis direction, bending deformation is absorbed in the gap (P), and the front portion 6 is easily bent. Can be made.

  When inserting the front part 6 into the first elbow pipe 10, the tool insertion tool 1 is pushed in while rotating around the central axis, and the coiled front part 6 is engaged with the step 11 on the start end side of the first elbow pipe 10. Thus, a propulsive force can be obtained by the principle of a screw, and the front side portion 6 can be easily inserted into the first elbow pipe 10 while being curved. Since the wire rod 3 has a flat cross section, it is easy to mesh with the step 11, and the meshing is unlikely to occur as in the case where the wire rod 3 has a circular cross section.

  By pushing the front part 6 further into the first elbow pipe 10, the vicinity of the front end of the front part 6 is caught by the step 12 on the terminal side of the first elbow pipe 10 (see FIG. 5). In the form shown in FIG. 5, since the winding diameter of the front end of the front portion 6 is set to be smaller than the central portion, the front end of the wire rod 3 rides on without being caught by the step 12. In this state, the tool insertion tool 1 is pushed in while being rotated around the central axis, whereby the coiled front portion 6 smoothly passes through the step 12 by the principle of screws.

  After the front end of the front portion 6 of the main body accommodating portion 4 passes through the first elbow pipe 10 and the rear end of the front portion 6 enters the first elbow pipe 10, the rear portion 7 continues to the front portion 6 and the rear portion 7 1 Enter the elbow pipe 10. After the rear part 7 has entered the first elbow pipe 10, it passes through the first elbow pipe 10 while being curved following the front part 6.

  When the tool insertion tool 1 is further pushed in, the main body accommodating portion 4 passes through the second elbow pipe 13 in the same manner as the first elbow pipe 10. At that time, by rotating the tool insertion tool 1 about the central axis, the tool insertion tool 1 is engaged with the step 14 on the start end side of the second elbow pipe 13 to obtain a driving force, and the step 15 on the end side of the second elbow pipe 13 is set. Pass smoothly (see FIG. 6).

  Here, the length (L0) of the main body accommodating portion 4 is set to be longer than the length in the central axis direction from the first elbow pipe 10 to the second elbow pipe 13 which is the curved portion of the pipe 2, and the front portion 6 The linear body accommodating portion 5 does not enter the first elbow pipe 10 until its front end passes through the second elbow pipe 13. Thereby, the linear body accommodating portion 5 is prevented from being displaced to the outside of the curved shape of the first elbow pipe 10 and the pushing force is deviated from the central axis of the main body accommodating portion 4.

  In this way, the tool 4 is inserted into the pipe 2 together with the tool insertion tool 1 while being protected inside the tool insertion tool 1. The tool inserted into the pipe inflates, for example, a balloon of the tool body to close the pipe 2 and closes the flow of gas and the like, thereby facilitating the piping work.

  In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, the interval between the spiral wire rods 3 constituting the main body accommodating portion 4 may be set so that the interval between adjacent portions in the central axis direction is set smaller on the rear side than the front side of the main body accommodating portion 4. Instead of dividing into a front part 6 having a gap between them and a rear part 7 having no gap between the wires 3, the gap may be gradually narrowed from the front end toward the rear end.

  The tool is not limited to a gas bag, and may be a camera for inspecting the inside of the pipe 2 or a gyroscope for measuring the arrangement angle and position of the pipe 2.

  Moreover, the main body accommodating part 4 can set not only the winding diameter of the front side front end to be smaller than the central part, but also can be set to the same winding diameter as the central part. In this case, the tip of the wire 3 may be caught by the steps 12 and 15, but the tip of the wire 3 is jumped by further rotating the tool insertion tool 1 around the central axis while deforming the tip of the wire 3. Steps 12 and 15 can be overcome at a stretch.

DESCRIPTION OF SYMBOLS 1 Tool insertion tool 2 Piping 2a Inner peripheral surface of piping 3 Wire rod 4 Main body accommodating part 5 Linear body accommodating part 6 Front side part 7 Rear side part 8 Bending part 9 Tapered part 10 1st elbow pipe 11, 12 Step 13 Second elbow Tubes 14, 15 Steps P Clearance L0 Length of main body accommodating portion L1 Length of linear body accommodating portion L2 Length of tapered portion F Friction force N Center axial force d / 2 Eccentric amount of friction force M Moment R Reaction force

Claims (4)

A tool insertion tool for inserting a tool having a tool body and a linear body extending rearward from the tool body into a pipe,
The coil is formed by forming a wire rod in a spiral shape, and a main body housing portion for housing the tool body is configured with the winding diameter of the spiral wire rod being set to a large diameter. A linear body accommodating portion configured to accommodate the linear body by setting the winding diameter of the spiral wire rod to a small diameter in the extending portion that is extended to,
The main body accommodating portion can be loaded with a frictional force between the main body accommodating portion and the inside of the tube as a central axial force, and a space between adjacent portions in the central axial direction of the spiral wire rod is defined as the main body. A tool insertion tool characterized by being set smaller on the rear side than on the front side of the housing portion.   The main body housing portion has a coil shape in which the front side portion is formed in a spiral shape with a gap in the central axis direction, and the rear side portion is a coil in which the wire shape is formed in a spiral shape without a gap in the central axis direction. The tool insertion tool according to claim 1, wherein the tool insertion tool is formed in a shape.   The tool insertion tool according to claim 1 or 2, wherein the main body housing portion is set to be longer than a length in a central axis direction of a bending portion of a tube into which the tool insertion tool is inserted.   A method for inserting the tool into a tube using the tool insertion tool according to claim 1, 2 or 3, wherein the tool is received in the tool insertion tool, and the tool insertion tool is rotated around a central axis. A tool insertion method comprising inserting a tool into a tube together with a tool insertion tool.

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