JP4537605B2 - Pipe cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a pipe cutting device used when cutting and forming a branch port or the like for connecting a branch pipe while maintaining the flow of fluid in the pipe at a specific location of a fluid transport pipe such as a water pipe. The present invention relates to a pipe cutting device for cutting and removing a part of a fluid transport pipe in a sealed housing.
[0002]
[Prior art]
In the conventional pipe cutting device, as shown in FIG. 12, a joint case 3 mounted in a state where a sealed space is formed between the outer periphery of the fluid transport pipe 1 and a portion corresponding to the perforation, and the joint case 3 In the housing H composed of a working case connected to the opening 3D of the working case via the gate valve 4, the ceiling wall of the working case is displaced radially outward with respect to the fluid transport pipe. In this portion, a rotary shaft 50 that can rotate around a drilling axis Y that is parallel to the vertical direction that is also orthogonal to the tube axis X is provided to be movable up and down, and the fluid transport pipe 1 is provided at the lower end of the rotary shaft 50. A cylindrical cutter 51 capable of cutting the rotary shaft 50, a driving means for driving and rotating the rotary shaft 50, and a feeding means for feeding the cylindrical cutter 51 in the drilling direction at a predetermined cutting speed via the rotary shaft 50. (E.g. real Flat reference Patent Publication No. 4-10474).
[0003]
[Problems to be solved by the invention]
In the conventional tube cutting device, a cylindrical cutter 51 that is driven and rotated around the perforation axis Y at a portion displaced radially outward with respect to the fluid transport tube 1 is fed at a predetermined cutting speed, so A part of the fluid transport pipe 1 located at a point is cut and removed in an arc shape. However, since the cylindrical cutter 51 enters the fluid transport pipe 1 as the drilling operation proceeds, the flow loss in the pipe is large. At the same time, a large fluid pressure acts on the rotating shaft via the cylindrical cutter 51, so that the driving load increases.
[0004]
In addition, the cutting edge of the cylindrical cutter 51 comes into contact with the curved peripheral wall surface of the fluid transport pipe 1 from above, and the cylindrical cutter 51 is pivotally supported in a cantilevered posture. The cylindrical cutter 51 easily escapes to the side away from the tube axis X, and the cutting load increases due to the center deflection of the cylindrical cutter 51, and the cylindrical cutter 51 is liable to stop rotating or break the driving means.
[0005]
Further, in order to suppress the core touch of the cylindrical cutter 51 in the initial stage of cutting, the cutting edge 51a is formed along the drilling axis Y at the center position of the ceiling wall portion 51A in the cylindrical cutter 51 as shown in FIG. The guide shaft 52 that protrudes further outward is attached, and the bottom wall portion of the joint case 3 is fitted to the guide shaft 52 from above and below before the cutting edge 51a of the cylindrical cutter 51 contacts the pipe peripheral wall. In addition, it is necessary to attach the guide cylinder 53 that feeds and guides the cylindrical cutter 51 along the axial direction of the drilling axis, which easily leads to a complicated guide structure and an increase in manufacturing cost.
[0006]
Further, among the plurality of cutting tips provided on the blade edge 51a of the cylindrical cutter 51 due to the core touch of the cylindrical cutter 51, the cutting start position of the subsequent cutting tip is the drilling axis Y side from the predetermined start position. Since the cutting load of the subsequent cutting tip increases, it is necessary to attach a large cutting tip from the strength surface of the cylindrical cutter 51. As a result, a large amount of chips are generated at the time of drilling. Easy to take time.
[0007]
The present invention has been made in view of the above-mentioned actual situation, and the main problems thereof are a reduction in the flow rate loss in the pipe and a reduction in the driving load during the drilling operation, a reduction in the amount of chips generated, and a structure including the housing. The present invention is to provide a pipe cutting device capable of reliably cutting a perforation forming portion of a fluid transport pipe while simplifying the manufacturing process and reducing the manufacturing cost.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a pipe cutting device for cutting and removing a part of a fluid transport pipe in a sealed housing,
A cable capable of rotating around a drilling axis parallel to the direction intersecting the pipe axis and capable of cutting the fluid transport pipe at a portion displaced radially outward with respect to the fluid transport pipe in the housing A cutting blade unit that movably supports the cutting blade or strip-shaped cutting blade in a state where at least a part of the cutting blade is parallel or substantially parallel to the drilling axis, and is held by the cutting blade unit. Provided with driving means for driving the cord-like or strip-shaped cutting blade and feed means for rotating the cutting blade unit around the drilling axis, and parallel or substantially parallel to the drilling axis of the cord-like or band-like cutting blade This portion is constituted by a cutting action portion that cuts the pipe peripheral wall in an arc around the perforation axis as the cutting blade unit is rotated by the feeding means.
[0009]
According to the above characteristic configuration, when a specific portion of the fluid transport pipe is cut (pierced) in the housing, the cutting blade unit arranged in a portion displaced radially outward with respect to the fluid transport pipe or When the belt-like cutting blade is driven by the driving means and the cutting blade unit is rotated around the drilling axis by the feeding means, the cord-like or belt-like cutting blade is cut parallel or substantially parallel to the drilling axis. Since only the action part cuts the pipe peripheral wall while cutting it in an arc around the perforation axis, it is possible to suppress a reduction in the flow area in the pipe during drilling, as compared with the conventional pipe cutting device. The driving load due to pressure can also be reduced, and furthermore, a thin blade-like or strip-like one can be used as the cutting blade, so that the amount of chips generated can be reduced.
[0010]
In addition, at the start of cutting, by setting the line segment connecting the cutting action portion of the cord-like or strip-like cutting blade and the drilling axis to be in a state along or close to the axial direction of the fluid transport pipe as much as possible, Since it is possible to start cutting the cutting action portion of the strip-shaped cutting blade in a direction perpendicular to the pipe peripheral wall or at an angle close thereto, it is possible to prevent the cutting blade from escaping at the start of cutting. As described above, a large guide structure for correcting the cutting position of the cutting blade is not required, and the cutting load on the cutting tip or the like provided at the cutting edge of the cord-like or band-like cutting blade can be reduced.
[0011]
Therefore, the drilling location of the fluid transport pipe is reduced while reducing the flow loss in the pipe during drilling and reducing the driving load, reducing the amount of chips generated, simplifying the structure including the housing, and reducing the manufacturing cost. It can be cut reliably.
[0012]
According to a second aspect of the present invention, there is provided a tube cutting apparatus having a section collecting jig for holding a section to be cut and removed by a cord-like or band-like cutting blade in the cutting blade unit, which is relatively rotatable around a drilling axis. It is in the point provided in.
According to the above-described characteristic configuration, the section collection jig can be maintained at the section holding position facing the perforation forming portion of the fluid transport pipe regardless of the rotation of the cutting blade unit, and is cut with a cord-shaped or band-shaped cutting blade. The section to be removed can be securely held.
[0013]
According to a third aspect of the present invention, there is provided a joint case in which the housing is mounted in a state in which a closed space is formed between the housing and the outer peripheral surface of the perforation forming portion of the fluid transport pipe, A cutting work position in which the cutting blade unit is located in the joint case, and a detachment position in which the cutting blade unit is located in the work case. And is configured to be movable.
According to the above characteristic configuration, when cutting (punching) a specific part of the fluid transport pipe in the housing, the cutting blade unit is arranged at a predetermined position in the joint case through the working case and the gate valve, and in this state the cutting blade The cord-like or belt-like cutting blade of the unit is driven by the driving means, and the cutting blade unit is rotated around the drilling axis by the feeding means, and the pipe peripheral wall is cut in an arc around the drilling axis. When the cutting process is completed, the cutting blade unit located in the joint case is moved into the work case, and then the gate valve is closed to move only the cutting blade unit to the outside while maintaining the fluid flow in the pipe. Can be removed.
[0014]
According to a fourth aspect of the present invention, there is provided a tube cutting apparatus having a bearing portion that fits and holds the tip of a rotary shaft equipped with a cutting blade unit so as to be rotatable around a perforation axis. In the point.
According to the above-described characteristic configuration, the cutting blade unit is resistant to cutting reaction force and the like around the drilling shaft core by fitting the tip of the rotary shaft equipped with the cutting blade unit with the bearing portion formed in the joint case. It can be rotated well.
[0015]
The characteristic structure of the pipe cutting device according to claim 5 of the present invention resides in that the cord-like or strip-like cutting blade is constituted endlessly.
According to the above characteristic configuration, since the cord-like or belt-like cutting blade is endless rotation type, the life of the cutting blade can be extended compared to the reciprocating drive type.
[0016]
The characteristic configuration of the pipe cutting device according to claim 6 of the present invention is that a tension adjusting means for adjusting the tension of the endless cord-like or endless belt-like cutting blade is provided.
According to the above characteristic configuration, the tension of the endless cord-like or endless belt-like cutting blade can be adjusted to an appropriate tension according to various cutting conditions such as the thickness and material of the fluid transport pipe, and the life of the cutting blade can be reduced. Can be extended.
[0017]
According to a seventh aspect of the present invention, there is provided a tube cutting device having a feature configuration in which the endless cord-like or endless belt-like cutting blade is rotated around the plurality of rings that are rotatably driven and rotated. It is in the point which the collar part which prevents contact movement in the direction of an axial center is formed.
According to the above characteristic configuration, the cutting reaction force acting on the cutting action portion of the endless cord-like or endless belt-like cutting blade can be received by the flanges formed on the plurality of ring bodies. Alternatively, it is possible to suppress the displacement of the endless belt-shaped cutting blade in the direction of the rotation axis of the ring body.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
1 to 6 show a flow of fluid in the fluid transport pipe 1 to a specific location (perforation formation location) sealed by the housing H among metal fluid transport tubes 1 used as water pipes and gas pipes. The branch port 1A is cut and formed in an uninterrupted state as it is, and the branch tube 2 which is another fluid transport tube connected to the joint case 3 which is a constituent member of the housing H from the horizontal direction and the fluid transport tube 1 And a pipe cutting device used therefor.
[0019]
The housing H used in this fluid transport path changing method has a branch connection pipe projecting outward along a horizontal or substantially horizontal direction intersecting (orthogonal in the present embodiment) with respect to the tube axis X of the fluid transport pipe 1. The fitting case 3 made of cast iron, in which the part 3C is integrally formed, is fitted on the outer periphery of the fluid transport pipe 1 in a sealed state (sealed in a liquid-tight or air-tight state) (outer jacket mounted), A passage through which a cutting blade unit A of a pipe cutting device for cutting and forming a branch port 1A in the pipe peripheral wall of the fluid transport pipe 1 can be moved in the vertical direction in the upper opening 3D for drilling work formed in the joint case 3 Cast iron having an internal space in which the work gate valve 4 provided with 4a is detachably fixedly connected in a sealed state, and the work blade valve 4 can be accommodated in the upper part of the work gate valve 4 Work case 5 made in a sealed state It is constructed by fixedly connected to standing.
[0020]
As shown in FIGS. 1 to 4, the joint case 3 is divided into two parts so as to be externally fitted to the fluid transport pipe 1 from both sides in the pipe radial direction, and is composed of split joint case bodies 3 </ b> A and 3 </ b> B. The split joint case bodies 3A and 3B externally fitted to the fluid transport pipe 1 are detachably attached to both ends of the split joint case bodies 3A and 3B with a plurality of bolts as an example of fastening means. The connecting flange portions 3a and 3b for fixed connection are integrally formed, and the inner peripheral surface of each split joint case body 3A and 3B is made of a synthetic rubber that seals between the outer peripheral surface of the fluid transport pipe 1 An annular sealing material 6 (for example, styrene butadiene rubber or the like) is attached.
[0021]
As shown in FIGS. 1 to 4, the pipe cutting device is arranged in a vertical direction (intersection) with respect to the pipe axis X at a position displaced radially outward with respect to the fluid transport pipe 1 in the housing H. An endless cord-like or endless belt-like cutting blade 7 that can be rotated around a drilling axis Y parallel to an example of the direction) and that can cut the fluid transport pipe 1, at least a part of which is a drilling axis Y A cutting blade unit A that is supported to be driven in a parallel or substantially parallel posture is disposed, and a driving means B that drives an endless cord-like or endless belt-like cutting blade 7 held by the cutting blade unit A. And a feeding means C for rotating the cutting blade unit A around the drilling axis Y, and further, the cutting blade unit A is located in the joint case 3 and in the working case 5 It is possible to move up and down freely to and from the attachment / detachment position. And it is configured to be detachable from the use gate valve 4.
[0022]
A section recovery jig D for holding a section P to be cut and removed by the endless cord-like or endless belt-like cutting blade of the cutting blade unit A is provided so as to be relatively rotatable around the drilling axis Y, and the endless cord A tension adjusting means E for adjusting the tension of the endless or endless belt-like cutting blade 7 from the outside of the housing H is provided.
[0023]
As shown in FIGS. 1 to 6, the cutting blade unit A is connected to a connecting cylinder 5 </ b> B connected to the ceiling wall portion 5 </ b> A of the working case 5 in a concentric state with the drilling axis Y, and the working case 5 The rotary shaft 11 inserted to the vicinity of the bottom wall portion of one split joint case body 3B provided with the branch connection pipe portion 3C out of the two split joint case bodies 3A and 3B of the joint case 3 through the inside is provided with a drilling axis. Inserted slidably around Y and slidable in the drilling axis Y direction, at the lower side of the rotating shaft 11 and at two locations separated by an interval larger than the outer diameter of the fluid transport pipe 1 In other words, a state in which the band-like saw blade, which is an example of the endless cord-like or endless belt-like cutting blade 7, can be driven and rotated at two locations facing each other in the horizontal direction to both the connecting flange portions 3a of the split joint case body 3A. A pulley (an example of a wound ring body) 13 that is wound in a rectangular shape is disposed.
[0024]
The rotary shaft 11 has a double structure that is relatively slidable in the direction of the drilling axis Y and is fitted in a state in which relative rotation around the drilling axis Y is blocked by relative rotation restricting means such as a key. Consisting of the rotating cylinder shafts 11A and 11B, the lower end surface of the lower protruding cylinder shaft portion of the inner rotating cylinder shaft 11B protruding downward from the outer rotating cylinder shaft 11A is concentric with the drilling axis Y. A guide shaft 11C for rotation of rotation that protrudes in a state is provided.
[0025]
Of the four pulleys 13, the upper two pulleys 13 are horizontally extended from the lower end portion of the outer rotating cylindrical shaft 11 </ b> A toward the upper connection flange portion 3 a side of the split joint case body 3 </ b> A. The lower two pulleys 13 are separated from the power take-out case 9 fixed to the lower end of the inner rotary cylinder shaft 11B and the lower end of the inner rotary cylinder shaft 11B. A pulley 13 supported rotatably on the tip of the lower support frame 12 extending horizontally toward the lower connecting flange portion 3a side of the joint case body 3A, and further supported on the power take-out case 9 Is configured in the drive pulley.
[0026]
Of the belt-like saw blades 7 wound around the four pulleys 13, the posture is parallel or substantially parallel to the drilling axis Y, and the set maximum cutting depth position of the branch port 1 </ b> A with respect to the fluid transport pipe 1. One of the vertical saw blade portions 7a that can be moved to the cutting portion is configured as a cutting action portion that cuts the tube peripheral wall while cutting it in an arc around the perforation axis Y as the cutting blade unit A is rotated by the feeding means C. In addition, the four pulleys 13 are arranged at positions where the band-like saw blade 7 wound around the pulleys 13 does not interfere with other components.
[0027]
Each of the pulleys 13 is integrally formed with an annular flange 13a that prevents the band-like saw blade 7 from coming off and moving in the direction of the rotational axis of the pulley 13 due to a cutting load such as a cutting reaction force, The winding surface of each pulley 13 is configured as a tapered surface having a smaller diameter toward the flange 13a side.
[0028]
Furthermore, the bottom wall portion in the joint case 3 is fitted to the guide shaft 11C of the inner rotary cylinder shaft 11B of the cutting blade unit A so as to be relatively rotatable from the vertical direction, and the rotary shaft 11 is rotated around the perforation axis Y. The inner rotating cylinder shaft 11B is prevented from moving relative to the housing H in the direction of the drilling axis Y, in other words, the housing H Regulating means for preventing relative movement of the inner rotating cylinder shaft 11B in the direction of the drilling axis Y with respect to the guide shaft 11C and the bearing portion of the inner rotating cylinder shaft 11B regardless of the adjusting operation by the tension adjusting means E is provided. 15 is maintained so as to be kept in engagement.
[0029]
The drive means B is detachably fixedly connected to the connection flange 5b of the connection cylinder 5B of the work case 5 via a plurality of bolts which are examples of fastening means. The output shaft 16a of the first electric motor 16 attached to the upper portion is connected to the upper end portion of the first intermediate transmission shaft 17 supported so as to be relatively rotatable in the inner rotary cylinder shaft 11B, and to the power take-out case 9 Supports a drive shaft 18 to which the drive pulley 13 is fixed and a second intermediate transmission shaft 20 linked to the drive shaft 18 via a pair of bevel gears 19 so as to be rotatable around a horizontal axis, The first intermediate transmission shaft 17 and the second intermediate transmission shaft 20 are configured to be interlocked via a bevel gear 21 pair.
[0030]
When the first electric motor 16 is driven and controlled, power is transmitted to the drive pulley 13 via the first intermediate transmission shaft 17, the bevel gear 21 pair, the second intermediate transmission shaft 20, the bevel gear 19 pair, and the drive shaft 18, The band-like saw blades 7 wound around the four pulleys 13 are driven at an appropriate cutting rotation speed according to various cutting conditions such as the thickness and material of the fluid transport pipe 1.
[0031]
The feeding means C is fixed in the transmission case 10 to the drive gear 24 fixed to the output shaft 23a of the second electric motor 23, and to the upper end of the inner rotary cylinder shaft 11B while meshing with the drive gear 24. The passive gear 25 is provided.
[0032]
Then, when the second electric motor 23 is driven and controlled, power is supplied to the inner rotating cylinder shaft 11B via the drive gear 24 and the passive gear 25 and to the outer rotating cylinder shaft 11A that rotates integrally with the inner rotation cylinder means via relative rotation restricting means such as a key. Is transmitted, and the band-like saw blade 7 of the cutting blade unit A provided across both the rotating cylindrical shafts 11A and 11B has the perforation axis Y which is also the axis of the rotating shaft 11 as a rotation center, and the fluid transport pipe 1 It is rotated at an appropriate setting feeding speed according to various cutting conditions such as thickness and material of the steel.
[0033]
As shown in FIGS. 5 and 6, the section collection jig D is connected to the tube axis X of the fluid transport tube 1 by contact with the inner rotary tube shaft 11 </ b> B and the annular receiving member 28 fixed thereto. A swiveling member 29 is externally fitted on the perforation axis Y at the same height so as to be relatively rotatable. A magnet 30 capable of attracting and holding the section P cut and separated from the fluid transport pipe 1 is provided on the swiveling member 29. A coil that is an example of an elastic urging body that attaches the holding member 31 so as to be horizontally movable within a certain range along the diameter direction of the fluid transport pipe 1 and urges the holding member 31 to move toward the fluid transport pipe 1. A spring 32 is provided, and the holding member 31 is in contact with the peripheral wall of the fluid transport pipe 1 when the cutting blade unit A located in the work case 5 is lowered to the cutting work position in the joint case 3. Accordingly, the holding member 31 is moved to the coil spring 3 Cam surface 31a to retract is formed to a movable position passing against the elastic biasing force.
[0034]
As shown in FIGS. 2 and 5, the tension adjusting means E is provided on the upper cylindrical portion of the inner rotating cylindrical shaft 11B and the upper end portion of the outer rotating cylindrical shaft 11A located in the transmission case 10 in the drilling axis direction ( The connecting flange portions 35A and 35B that face each other in the vertical direction) are integrally formed, and of these, at the circumferential specific location (one or a plurality of locations in the circumferential direction) of the upper connecting flange portion 35A located on the inner rotating cylinder shaft 11B side. A through hole 35a is formed through which the adjustment bolt 36 is rotatably inserted and held, and the lower connection flange portion 35B located on the outer rotating cylinder shaft 11A side is provided with the adjustment bolt 36 held by the upper connection flange portion 35A. Is formed by forming a screw hole 35b into which is screwed.
[0035]
Further, the adjustment bolt 36 is brought into contact with the lower surface of the upper connecting flange portion 35A, so that the outer rotary cylinder shaft 11A moves upward relative to the inner rotary cylinder shaft 11B at times other than during the tension adjustment operation by the adjustment bolt 36. The transmission case 10 is provided with an operation window 38 for adjusting the adjustment bolt 36 from the outside with a tool or the like.
[0036]
When the adjustment bolt 36 is rotated through the operation window 38, both the rotating cylinder shafts 11A and 11B are in an integrally rotating state via the relative rotation restricting means, and the inner rotating cylinder shaft 11B is perforated with respect to the housing H. Since the relative movement in the axis Y direction is restricted, the outer rotary cylinder shaft 11A slides along the perforation axis Y direction with respect to the inner rotary cylinder axis 11B, and accordingly, the upper support frame 8 side. The two pulleys 13 move in the drilling axis Y direction, and the tension of the band-shaped saw blade 7 wound around the pulley 13 is adjusted.
[0037]
The tension of the band-like saw blade 7 is adjusted according to various cutting conditions such as the thickness and material of the fluid transport pipe 1, but according to the cutting situation during the cutting process of cutting and forming one branch port 1A. The tension of the band-like saw blade 7 may be adjusted. That is, at the initial stage of cutting when the cutting edge of the band-shaped saw blade 7 is easy to escape, the tension of the band-shaped saw blade 7 is set larger than the set standard tension, and when the cutting groove is formed on the tube wall of the fluid transport pipe 1, The adjusting bolt 36 is operated so that the tension of the band-shaped saw blade 7 is returned to the set standard tension.
[0038]
[Second Embodiment]
In the first embodiment described above, an example of the endless cord-like or endless belt-like cutting blade 7 is provided at two locations on the lower side of the rotary shaft 11 and at a distance greater than the outer diameter of the fluid transport pipe 1. Four pulleys (an example of a wound ring body) 13 for winding a certain band-shaped saw blade 7 in a rectangular shape in a state where it can be driven and rotated are arranged. As shown in FIGS. The blade 7 may be implemented by providing three pulleys 13 that are wound in a triangular shape in a state where the blade 7 can be driven and rotated.
[0039]
In this case, the three pulleys 13 of the upper support frame 8 extending horizontally from the lower end portion of the outer rotary cylinder shaft 11A constituting the rotary shaft 11 toward the upper connection flange portion 3a side of the split joint case body 3A. A power take-out case 9 fixed to the lower cylindrical shaft portion at the same height as the tube axis X of the fluid transport pipe 1 among the distal end portion and the inner rotating cylindrical shaft 11B constituting the rotating shaft 11, and the inner side It is rotatably supported at the tip end portion of the lower support frame 12 that extends horizontally from the lower end portion of the rotating cylindrical shaft 11B toward the lower connecting flange portion 3a side of the split joint case body 3A.
[0040]
Of the strip-shaped saw blades 7 wound around the three pulleys 13, the posture is parallel or substantially parallel to the drilling axis Y and moves to the maximum cutting depth position of the branch port 1A with respect to the fluid transport pipe 1 The possible vertical saw blade portion 7a is configured as a cutting action portion that cuts the pipe peripheral wall while cutting it in an arc around the perforation axis Y as the cutting blade unit A is rotated by the feeding means C.
[0041]
Since other configurations are the same as or substantially the same as the configurations described in the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. To do.
[0042]
[Third Embodiment]
In each of the above-described embodiments, the cutting blade unit A is fixed at a fixed position with respect to the rotating shaft 11, but as shown in FIGS. 9 and 10, the rotating shaft 11 and the movable frame frame 40 of the cutting blade unit A In the meantime, by cutting and adjusting the cutting blade unit A in the radial direction of the fluid transport pipe 1 with respect to the rotating shaft 11, cutting from the drilling axis Y to the cutting action portion 7a of the endless cord-like or endless belt-like cutting blade 7 is performed. You may implement by providing the cutting depth adjustment means F which changes a radius.
[0043]
The incision depth adjusting means F fixes the sliding guide member 41 that supports the rectangular movable frame frame 40 of the cutting blade unit A to be slidable in the horizontal direction at two upper and lower portions of the rotary shaft 11, and Between the movable frame 40 and the rotating shaft 11, a screw type adjusting mechanism 42 that expands and contracts by rotating operation is provided.
[0044]
The screw type adjustment mechanism 42 includes a first screw shaft 42A pivotally attached to the bracket 42 of the movable frame frame 40, a second screw shaft 42B pivotally attached to the bracket 43 of the cylindrical shaft-shaped rotating shaft 11, and The adjusting operation body 42C is screwed over the screw shafts 42A and 42B.
[0045]
In addition, the cutting blade unit A is a pulley that winds in a rectangular shape in a state in which a belt-like saw blade, which is an example of an endless cord-like or endless belt-like cutting blade 7, can be driven and rotated at four corners of the movable frame 40. An example of a wound ring body) 13 is disposed, and among the band-like saw blades 7 wound around the four pulleys 13, the posture is parallel or substantially parallel to the drilling axis Y and the fluid transport pipe 1 On the other hand, one vertical saw blade portion 7a that can be moved to the set maximum cutting depth position of the branch port 1A is moved around the perforation axis Y as the cutting blade unit A is rotated by the feeding means C. And a cutting action part that cuts while cutting in an arc shape at the upper part of the back surface of the movable frame frame 40 and a corner part farthest from the vertical saw blade part 7a of the band-shaped saw blade 7 is driven. Install an intermediate transmission case 45 to support the drive shaft 18 of the pulley 13 It is configured Te.
[0046]
The power take-out case 9 fixed to the rotary shaft 11 is supported by a spline cylinder shaft 46 that is linked to the first intermediate transmission shaft 17 disposed concentrically within the rotary shaft 11 via a pair of bevel gears 21. In addition, the intermediate transmission case 45 has a spline shaft 47 which is linked to the drive shaft 18 via a pair of bevel gears 19 and is fitted to the spline cylinder shaft 46 so as to be extendable from the horizontal direction in an integrally rotated state. It is supported.
[0047]
The same or substantially the same components as those described in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.
[0048]
[Fourth Embodiment]
In the first embodiment described above, the cutting blade unit A can be rotated around the perforation axis Y over an arbitrary angular range by the drive control of the second electric motor 23 of the feeding means C. As shown in FIGS. 11A and 11B, the rotation range of the cutting blade unit A around the drilling axis Y by the feeding means C is set to a specific rotation angle range (for example, , Within 180 degrees), a rotation range regulating means G that regulates the angle may be provided.
[0049]
The rotation range restricting means G includes an arc-shaped long hole 48 engaged with the connecting flange 5b of the work case 5 and the tip of the adjusting bolt 36 of the tension adjusting means E 180 degrees around the drilling axis Y. And the rotation range of the cutting blade unit A around the drilling axis Y is restricted to a rotation angle range of 180 degrees.
[0050]
Since other configurations are the same as or substantially the same as the configurations described in the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. To do.
[0051]
[Other Embodiments]
(1) In each of the above-described embodiments, a band-like saw blade is used as the endless cord-like or endless belt-like cutting blade 7, but instead of this, an endless chain saw or a wire saw equipped with a cutting tip is used. In addition, instead of such an endless rotation type, a linear or belt-like cutting blade 7 may be configured to reciprocate.
[0052]
(2) Of the wound ring body 13 such as a pulley for rotatably winding the endless cord-like or endless belt-like cutting blade 7, at least the drive-side wound ring body 13 has slip caused by cutting resistance. In order to suppress the occurrence, anti-slip processing such as urethane may be performed.
[0053]
(3) In each of the above-described embodiments, the holding member 31 of the section collection jig D is provided with the magnet 30 for attracting and holding the section P cut and removed from the metal fluid transport pipe 1 such as a cast iron pipe or a steel pipe. However, the entire holding member 31 may be configured by a magnet.
In this case, it is also possible to collect chips by attaching them to the slice P magnetized by the magnet.
Furthermore, in the case where the fluid transport pipe 1 is a synthetic resin pipe such as a vinyl chloride pipe or a polyethylene pipe, the holding member 31 may be secured in advance to the portion corresponding to the section of the synthetic resin fluid transport pipe 1 with an adhesive.
In short, the section collecting jig D may have any structure as long as it can hold the section P cut and removed by the cord-like or strip-like cutting blade 7.
[0054]
(4) As the driving means B, any structure may be used as long as it can drive the cord-like or belt-like cutting blade 7 held by the cutting blade unit A.
[0055]
(5) Further, the feeding means C may be implemented using any structure as long as the cutting blade unit A can be rotated around the drilling axis Y.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing a first embodiment of the present invention before starting drilling.
[Fig. 2] Side view of a partly cutout during drilling
FIG. 3 is a partially cutaway side view when the cutting blade unit is raised into the working case.
FIG. 4 is a cross-sectional plan view before starting drilling
FIG. 5 is an enlarged cross-sectional side view of the main part.
6 is a sectional view taken along line VI-VI in FIG.
FIG. 7 is an enlarged cross-sectional side view of a main part in the middle of drilling showing a second embodiment of the present invention.
FIG. 8 is an enlarged sectional plan view of a cutting blade unit.
FIG. 9 is an enlarged front view of the main part showing a third embodiment of the present invention.
FIG. 10 is an enlarged sectional plan view of the main part.
FIG. 11 shows a fourth embodiment of the present invention,
(B) is an enlarged cross-sectional side view of the main part
(B) is an enlarged sectional plan view of the main part
FIG. 12 is an enlarged cross-sectional side view of a main part showing a conventional tube cutting device.
[Explanation of symbols]
A Cutting blade unit
B Drive means
C delivery means
D Section recovery jig
E Tension adjustment means
X Tube axis
Y Drilling core
H housing
P section
1 Fluid transport pipe
3 Joint case
4 Work gate valve
5 Case for work
13 Winding ring (pulley)
13a buttock
15 Bearing part

Claims (7)

A tube cutting device for cutting and removing a part of a fluid transport tube in a sealed housing,
A cable capable of rotating around a drilling axis parallel to the direction intersecting the pipe axis and capable of cutting the fluid transport pipe at a position displaced radially outward with respect to the fluid transport pipe in the housing A cutting blade unit that movably supports a blade-like or belt-like cutting blade in a state where at least a part of the blade is parallel or substantially parallel to the drilling axis, is detachably disposed, and is held by the cutting blade unit. A driving means for driving the cord-like or band-like cutting blade and a feeding means for rotating the cutting blade unit around the drilling axis, and parallel or substantially parallel to the drilling axis of the cord-like or band-like cutting blade A pipe cutting device comprising a cutting portion configured to cut the pipe peripheral wall in an arc around the perforation axis as the cutting unit is rotated by the feeding means. The tube cutting device according to claim 1, wherein the cutting blade unit is provided with a section collecting jig for holding a section to be cut and removed by a cord-shaped or strip-shaped cutting blade so as to be relatively rotatable around a drilling axis. The housing is connected to a joint case, which is mounted in a state where a sealed space is formed between the housing and the outer peripheral surface thereof at a perforation forming portion of the fluid transport pipe, and is connected to an opening of the joint case via a gate valve. 3. The apparatus according to claim 1, wherein the cutting blade unit is configured to be movable between a cutting work position located in the joint case and a detaching position located in the work case. Tube cutting device. The pipe cutting device according to claim 3, wherein the joint case is formed with a bearing portion that fits and holds the tip of the rotary shaft equipped with the cutting blade unit so as to be rotatable around the perforation axis. The tube cutting device according to any one of claims 1 to 4, wherein the cord-like or strip-like cutting blade is configured to be endless. The tube cutting device according to claim 5, further comprising tension adjusting means for adjusting the tension of the endless cord-like or endless belt-like cutting blade. A collar portion that prevents the endless rope-like or endless belt-like cutting blade from detaching in the direction of the axis of rotation on the plurality of rings that wind and hold the endless cord-like or endless belt-like cutting blade. The tube cutting device according to claim 5 or 6, wherein:

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