JP6037975B2 - Pipe cutting machine and pipe cutting method - Google Patents

Description

The present invention relates to a tube cutting machine and a tube cutting method for cutting a tube along a circumferential direction.

  2. Description of the Related Art Conventionally, pipe cutting machines that can cut a pipe into a rounded state are known in various forms such as a pipe saw, a wire saw, a rotary cutter, and a gas fusing machine.

JP 2002-205218 A

  Conventional pipe saws and rotary cutters require a large space outside the pipe in the radial direction when cutting the pipe. For this reason, there is a possibility that this conventional pipe saw or the like cannot be used for cutting a pipe when the outer side in the radial direction of the pipe is a narrow space, such as when an object exists on the outer side in the radial direction of the pipe. is there. In addition, there is a multiple tube having an inner tube and an outer tube. In such a multiple tube, the inner tube may be left as it is, and only a part of the outer tube may be cut. However, the conventional pipe saw and wire saw cut the pipe from the radially outer side to the radially inner side, and it is difficult to cut only the outer pipe without damaging the inner pipe. Furthermore, the multiple tube may be used as a gas tube that allows gas to pass inside the inner tube. And when the gas is a combustible gas, it is not preferable to use the conventional gas fusing machine cut | disconnected by an open fire for the cutting | disconnection of an outer tube | pipe. Here, the above-mentioned Patent Document 1 is a tube cutting machine that facilitates cutting of a tube in a narrow space, in which the tube is cut into a round shape with a rotary blade while moving in the circumferential direction of the tube. Is disclosed. This tube cutting machine cuts a tube by causing the blade edge to penetrate the tube and then moving it one turn in the circumferential direction while rotating the rotary blade. However, this conventional tube cutting machine still has room for improvement.

  Accordingly, a first object of the present invention is to provide a tube cutting machine capable of cutting a tube even in a narrow space. A second object of the present invention is to provide a tube cutting machine capable of cutting only the outer tube of a multiple tube. A third object of the present invention is to provide a pipe cutting machine capable of cutting pipes in places where the use of fire is restricted.

In order to achieve the above object, a tube cutting machine according to one aspect of the present invention is a cutting blade that cuts the cutting target tube while rotating on the radially outer side of the cutting target tube, and a rotation shaft of the cutting blade, A rotating shaft that extends in parallel to the axial direction of the cutting target tube, a drive unit that rotates the cutting blade via the rotating shaft, and the cutting target between the cutting blade and the driving unit. A cylindrical stator fixed to the pipe to be cut covering the outer peripheral surface of the tube, a cylindrical rotor covering the outer peripheral surface of the stator and capable of relative rotation in the circumferential direction concentrically with the stator, and the rotor A rotating operation unit that is operated by an operator when the rotor is rotated relative to the stator, and a holding unit that rotatably holds the rotating shaft that is positioned radially outside the stator and the rotor. And on the radially outer side of the rotor A support shaft that is arranged in parallel with a space with respect to the rotation shaft and that rotatably supports the holding portion, a fixing portion that fixes the support shaft to the rotor, and a shaft of the support shaft together with the rotation shaft A tube cutting machine comprising: a position adjusting unit that locks the holding unit rotated about a center at the rotated position and adjusts a cutting depth of the cutting blade; The plurality of members in the stator can be divided into a plurality of members in parallel with the axial direction, and the plurality of members in the stator are integrated on the outer peripheral surface of the pipe to be cut to form a cylindrical shape, and the rotor is in the axial direction The plurality of members in the rotor are integrated on the outer peripheral surface of the stator to form a cylindrical shape, and the position adjusting unit includes a first elastic member, Connected to the second elastic member and the holding portion. And an extending member disposed between the first elastic member and the second elastic member, which is disposed on the outer side in the radial direction of the rotor and opposite to the support shaft with respect to the rotation shaft. The first elastic member applies a force radially outward to the extending member, and the second elastic member applies a force radially inward to the extending member. it is characterized in that that.

A pipe cutting method according to an aspect of the present invention is a pipe cutting method using the pipe cutting machine according to the above invention, wherein at least a part of the pipe to be cut is embedded in a structure, and When the cutting part of the pipe to be cut exists along the space inside the structure, the length of the rotation shaft is between the wall surface on the side where the operator is present in the structure and the cutting part. It is characterized by being longer than the distance .

  In the tube cutting machine according to the present invention, a rotating shaft is disposed on the radially outer side of the stator and the rotor, and the cutting blade and the drive unit are disposed with the stator and the rotor sandwiched in the axial direction. For this reason, this pipe cutting machine can cut | disconnect this cutting object pipe | tube along the circumferential direction, even if it is the space where the radial direction outer side of a cutting object pipe | tube is narrow. Moreover, since this pipe cutting machine can finely adjust the cutting depth of the cutting blade with the position adjusting unit, it is possible to cut only the outer pipe that is the cutting target pipe without damaging the inner pipe. In addition, this pipe cutting machine makes the cutting depth shallower than the wall thickness of the pipe to be cut at the position adjusting section, and cuts little by little while moving the rotating cutting blade and the like in the circumferential direction over a plurality of turns. As a result, the pipe to be cut is divided into a circular state. For this reason, this tube cutting machine has a greater depth of cut than the thickness of the tube to be cut, and the spark cutting is less than the case where the cutting blade or the like is moved only once in the circumferential direction of the tube to be cut. Occurrence can be suppressed. Therefore, this pipe cutting machine can cut the pipe to be cut at a place where the use of fire is restricted.

FIG. 1 is a front view of a pipe cutting machine installed on a pipe to be cut. FIG. 2 is a side view of a pipe cutting machine installed on the pipe to be cut. FIG. 3 is a top view of a pipe cutting machine installed on the pipe to be cut. FIG. 4 is a rear view of the pipe cutting machine installed on the pipe to be cut. FIG. 5 is a perspective view of a double pipe embedded in a structure. FIG. 6 is a perspective view of the double pipe embedded in the structure after the suspension operation. FIG. 7 is a cross-sectional view of the double pipe embedded in the structure as seen from the side after the suspension operation. FIG. 8 is a front view showing the stator before installation with respect to the cutting target pipe. FIG. 9 is a side view showing the stator before installation on the cutting target pipe. FIG. 10 is a front view showing the stator installed on the cutting target pipe, the rotor before the stator is installed, and the cutting device. FIG. 11 is a side view showing a stator installed on a pipe to be cut, a rotor before the stator is installed, and a cutting device. FIG. 12 is a diagram for explaining the movement of the cutting blade when the housing of the driving unit is pushed down.

  Below, the example of the pipe cutting machine concerning the present invention is described in detail based on a drawing. The present invention is not limited to the embodiments.

[Example]
An embodiment of a pipe cutting machine according to the present invention will be described with reference to FIGS.

  The code | symbol 1 of FIGS. 1-4 shows the pipe cutting machine of a present Example. These drawings show a state in which the tube cutting machine 1 is installed on a cylindrical tube to be cut (hereinafter referred to as a “cutting target tube”) Pc. In the following, unless otherwise specified, a direction along the central axis of the cutting target pipe Pc is referred to as an axial direction, and a direction around the cutting target pipe Pc is referred to as a circumferential direction. In addition, a direction perpendicular to the central axis of the pipe to be cut Pc is referred to as a radial direction, and among these, a side facing inward is referred to as a radially inner side and a side facing outward is referred to as a radially outer side.

  This pipe cutting machine 1 cuts the cutting target pipe Pc in the circumferential direction and divides it into a ring-cut state. In this pipe cutting machine 1, the cutting target pipe Pc is cut while moving the cutting blade 10 along the circumferential direction on the outer peripheral surface of the cutting target pipe Pc. The tube cutting machine 1 can cut not only a single tube but also a multiple tube having at least one inner tube and one outer tube. When cutting the multiple pipe, the pipe cutting machine 1 can cut all of them as the cutting target pipe Pc in order from the outer pipe side from the outer pipe to the inner pipe. If the inner pipe is present, it is possible to cut it while leaving at least one inner pipe on the radially inner side, and it is also possible to cut only the outer pipe as the cutting target pipe Pc.

  In the following description, the pipe cutter 1 will be described with a double pipe P (FIGS. 5 to 7) provided with one outer pipe P1 and one inner pipe P2 as a specific example.

  The fluid can be carried elsewhere by moving through the tube. For this reason, in order to transport the fluid using the pipe, for example, in order to protect the pipe through which the fluid passes from the surroundings, a double pipe P in which the inner pipe P2 through which the fluid passes is covered with the outer pipe P1 from the radially outer side is used. Used. For example, the double pipe P is installed as a pipe passing through a structure St such as a bridge pier, and is used to carry a fluid such as a gas inside the inner pipe P2. The double pipe P is buried in the structure St in a state of being covered from the outside in the radial direction by a structural member such as concrete. In such a buried double pipe P, for example, a resin mortar or rubber or the like is filled in the annular space between the outer pipe P1 and the inner pipe P2 in order to prevent deterioration in durability due to external factors. The member F is filled.

  The double pipe P having such a usage form is periodically inspected by an operator's visual inspection or a nondestructive inspection device for occurrence of a factor relating to a decrease in durability. First, the outer tube P1 is covered with the constituent members of the structure St and is difficult to inspect. Therefore, the outer pipe P1 is not inspected, the structure St around the outer pipe P1 is removed to cut a part of the outer pipe P1, and the filling member F is removed to expose the inner pipe P2. After that, the inner pipe P2 is inspected and repaired. 6 and 7 show an example of the state after the suspension work. This hanging work is performed using, for example, a water jet method. Furthermore, since the reinforcing bar of the structure St becomes an obstacle when the outer tube P1 is cut and removed, a part of the reinforcing bar is removed in the narrowest possible range necessary for cutting and removing the outer tube P1 in the radial direction. Therefore, in this example, as shown in FIG. 7, the back side removal range is narrower than the front side removal range. However, the back side removal range is a range in which at least the cutting blade 10 can be disposed in a space radially outside the outer tube P1. Further, the range for removing the hanger on the near side is set to a range necessary to restore at least the reinforcing bars of the cut structure St. On the other hand, since the periphery of the inner pipe P2 is covered with the outer pipe P1 and the filling member F, this is also difficult to inspect. For this reason, the inner pipe P2 is inspected after a part of the outer pipe P1 is cut and removed in the circumferential direction and the filling member F is further removed.

  Here, when the outer pipe P1 is cut, the outer pipe P1 is cut to a range where the durability and the range in which the durability of the inner pipe P2 that has been grasped or assumed in the inspection can be inspected and repaired can be performed. To do. In addition, as a result of the inspection of the inner pipe P2, when a repair target part in which a factor relating to the decrease in durability has occurred or there is a risk of a decrease in durability is detected, for example, the repair target part is radially A sleeve tube (not shown) (a tube having an inner diameter larger than the outer diameter of the inner tube P2 and smaller than the inner diameter of the outer tube P1) is arranged so as to cover from the outside, and both ends of the sleeve tube and the inner tube P2 are arranged. The inner pipe P2 is repaired by welding the outer peripheral surface thereof.

  In the double pipe P that has finished this inspection, it is necessary to repair the outer pipe P1 from which a part has been removed regardless of whether or not the inner pipe P2 is repaired. In that case, by arranging a new pipe having the same diameter as the outer pipe P1 in the removed part of the outer pipe P1, and mechanically connecting or fixing the pipe to the remaining part of the outer pipe P1 by welding. Then, the outer pipe P1 is repaired. After that, if the worker fills the space between the outer pipe P1 and the inner pipe P2 with the filling member F and removes the reinforcing bars, the worker replenishes the removed part by welding or the like, and removes the structure from the place where the suspension is removed. St constituent members are newly provided (concrete is placed).

  As described above, when the double pipe P is buried in a structure St such as a bridge pier when the double pipe P is inspected or repaired, the outer pipe P1 is surrounded as described above. It is necessary to remove the constituent member of the covering structure St. However, when removing the constituent member, it is not preferable to remove the constituent member over a wide range, for example, for reasons related to the strength of the structure St. For this reason, in such a work site, a pipe cutting machine that can cut the outer pipe P1 is required even if the space outside the radial direction of the outer pipe P1 (annular space after removing the suspension) is narrow. The tube cutting machine 1 of the present embodiment is configured so that the outer tube P1 (the cutting target tube Pc) can be cut even in such a narrow space. Hereinafter, the structure of this pipe cutting machine 1 is demonstrated based on FIGS. 1-4.

  The tube cutting machine 1 includes a cutting device including a cutting blade 10 for a cutting target tube Pc and a drive unit 20 for the cutting blade 10.

  The cutting blade 10 is a disk-shaped rotary blade that cuts the cutting target pipe Pc while rotating on the outer side in the radial direction of the cutting target pipe Pc. The cutting blade 10 has a rotating shaft (spinning shaft) 11 fixed at the center thereof. The cutting blade 10 is disposed on the radially outer side of the cutting target pipe Pc, and cuts the cutting target pipe Pc in the circumferential direction from the radial outer side. Therefore, the rotating shaft 11 is arranged in parallel to the axial direction on the radially outer side of the cutting target pipe Pc. The rotating shaft 11 is disposed on the radially outer side of a stator 31 and a rotor 32, which will be described later, covering a part of the outer peripheral surface of the cutting target pipe Pc. The cutting blade 10 is covered with a cover 12 at a portion that does not contact the cutting target pipe Pc.

  Here, in this illustration, the cutting location of the cutting target pipe Pc (outer pipe P1) is present at a position recessed with respect to the wall surface on the side where the worker is present in the structure St. For this reason, the rotating shaft 11 is extended from the wall surface of the structure St so that the cutting blade 10 is arrange | positioned in the deep position.

  The drive unit 20 rotates the cutting blade 10 by transmitting a driving force to the cutting blade 10 via the rotary shaft 11. Therefore, the drive unit 20 is provided with at least a power source (not shown). In the drive unit 20, an air motor, an electric motor, or the like is considered as a specific example of the power source, and the power of the power source is transmitted to the rotating shaft 11 as a driving force via a gear or the like. In this example, the output shaft 21 of the drive unit 20 is connected to the rotary shaft 11 via the shaft coupling 22. The output shaft 21 is a shaft concentric with the rotating shaft 11.

  The housing 23 of the drive unit 20 has a function of a grip unit when an operator performs a cutting operation. The grip portion may be provided with an on / off switch (not shown) that operates or stops the driving portion 20. When an operator cuts the cutting target pipe Pc, the operator pushes down the casing 23 (grip part) radially inward to press the cutting blade 10 against the cutting target pipe Pc.

  Further, the tube cutting machine 1 is provided with a circumferential direction guide device for guiding the cutting blade 10 in the circumferential direction. The circumferential direction guide device is for causing the operator to move the cutting blade 10 in the circumferential direction smoothly and simply. This circumferential guide device includes a stator 31 and a rotor 32.

  The stator 31 is a metal (for example, aluminum) cylindrical body that covers the outer peripheral surface of the cutting target pipe Pc, and is disposed between the cutting blade 10 and the drive unit 20. The stator 31 includes a cylindrical portion 31a having an inner diameter larger than the outer diameter of the cutting target pipe Pc, and an annular flange portion 31b provided at each end in the axial direction of the cylindrical portion 31a ( 2 and 3). The flange portion 31b extends radially outward from the outer peripheral surface of the cylindrical portion 31a.

Specifically, the stator 31 is divided into a plurality of members parallel to the axial direction, and these are integrated on the outer peripheral surface of the cutting target pipe Pc to form a cylindrical shape. Here, as shown in FIGS. 8 and 9, the first and second stator members 31 </ b> A and 31 </ b> B are divided in half. The first stator member 31A has a curved portion 31a ₁ which forms a portion of the cylindrical portion 31a, a flange portion _31b 1, 31b ₁ which forms a portion of the flange portion 31b, a. Further, the second stator member 31B includes a curved portion 31a ₂ that forms part of the cylindrical portion 31a, and flange portions 31b ₂ and 31b ₂ that form portions of the flange portion 31b.

As shown in FIGS. 10 and 11, the stator 31 covers the first stator member 31 </ b> A and the second stator member 31 </ b> B on the outer peripheral surface of the cutting target pipe Pc, and these are fixed by a fixing portion 31 c to be integrated. Let The fixing portion 31c fixes, for example, the respective end portions of the flange portions 31b ₁ and 31b ₁ of the first stator member 31A and the respective end portions of the flange portions 31b ₂ and 31b ₂ of the second stator member 31B. It is. For example, a screw portion having a male screw and a female screw may be used as the fixing portion 31c.

  The stator 31 is provided with a shaft center adjusting portion 31d for aligning the shaft center with the shaft center of the cutting target pipe Pc. The shaft center adjusting portion 31d includes female screws provided in at least three locations of the cylindrical portion 31a and at least three male screws that are respectively screwed into the female screws. The female screw is formed in a radial through hole provided in the cylindrical portion 31a. The worker attaches the male screw to the female screw, and protrudes the tip of the male screw from the inner peripheral surface of the cylindrical portion 31a so as to contact the outer peripheral surface of the cutting target pipe Pc. Then, the operator adjusts the amount of protrusion of each male screw from the cylindrical portion 31a, thereby aligning the axis of the stator 31 with the axis of the cutting target pipe Pc.

  Subsequently, the rotor 32 is a metal (for example, aluminum) cylindrical body that covers the outer peripheral surface of the stator 31. In this example, the rotor 32 is disposed so as to cover the outer peripheral surface of the cylindrical portion 31 a of the stator 31. The rotor 32 has an inner diameter that is larger than the outer diameter of the cylindrical portion 31a. Further, the rotor 32 can rotate in the circumferential direction concentrically with the stator 31.

  Specifically, the rotor 32 is divided into a plurality of members parallel to the axial direction, and these are integrated on the outer peripheral surface of the stator 31 to form a cylinder. The rotor 32 has a cutting device such as the cutting blade 10 or the drive unit 20 attached to one of the divided bodies. Here, as shown in FIGS. 10 and 11, the first and second rotor members 32 </ b> A and 32 </ b> B are divided into two halves. The cutting device is installed in the first rotor member 32A.

As shown in FIGS. 1 and 2, the rotor 32 covers a first rotor member 32A and a second rotor member 32B on the outer peripheral surface of the cylindrical portion 31a of the stator 31, and these are fixed by a fixing portion 32a. Integrate. Its fixed portion 32a includes a first engaging member 32a ₁ of annular, the second engagement member 32a ₂ having a claw portion for hooking to the first annular portion of the engaging member 32a _1, a. The second engagement member 32a ₂ includes a link mechanism that pulls the claw portion. One of the first engaging member 32a ₁ and the second engaging member 32a ₂ is provided at each end in the circumferential direction of the first rotor member 32A, and the other is disposed at each end in the circumferential direction of the second rotor member 32B. Provided in the section. The fixing portion 32a, by pulling the second pawl portion of the engaging member 32a ₂ hooked to the first engagement member 32a ₁ in the link mechanism to engage each other. The fixing portion 32a may be a screw portion having a male screw and a female screw provided on the first rotor member 32A and the second rotor member 32B, respectively.

  As described above, in this circumferential guide device, the rotor 32 is rotated relative to the stator 31 in the circumferential direction. The rotation of the rotor 32 in the circumferential direction is performed by the operator's hand. Therefore, the rotor 32 is provided with a rotation operation unit 32b used when the operator performs the rotation operation. The rotation operation part 32 b is formed in a shape that an operator can have when rotating the rotor 32, and is fixed to, for example, the outer peripheral surface of the rotor 32. In this example, three are provided.

  Further, the rotor 32 is provided with a plurality of friction reducing portions 32c at the time of relative rotation in a plurality of locations in the circumferential direction so that the relative rotation with respect to the stator 31 can be performed smoothly (FIGS. 10 and 11). The friction reducing portion 32c corresponds to a bearing between the outer peripheral surface of the stator 31 and the inner peripheral surface of the rotor 32, and a rotating body is interposed therebetween. The rotating body is arranged on the inner peripheral surface side of the rotor 32 so as to protrude from the inner peripheral surface toward the outer peripheral surface of the cylindrical portion 31a of the stator 31 and to contact the outer peripheral surface. This rotating body is rotatably held by a holding mechanism. For example, the rotating body is a sphere, a shaft roller, or the like. In this example, a sphere is arranged. In addition, you may arrange | position this friction reduction part 32c in the stator 31 side.

  The cutting device is attached to the first rotor member 32A via a fixing mechanism. The fixing mechanism will be described below.

  The fixing mechanism includes a holding unit that rotatably holds the rotating shaft 11 of the cutting blade 10. In this example, it has plate-shaped first and second holding portions 41A and 41B arranged at intervals in the axial direction (FIGS. 2 and 3). In the first and second holding portions 41A, 41B, for example, bearings are provided in through holes formed at one end in the longitudinal direction. The first and second holding portions 41A and 41B are arranged on the radially outer side of the rotor 32 (first rotor member 32A). The rotating shaft 11 is rotatably held by the first and second holding portions 41A and 41B by being inserted into the bearings of the first and second holding portions 41A and 41B.

  The fixing mechanism is provided with a support shaft 42 that is arranged in parallel to the axial direction and rotatably supports the first and second holding portions 41A and 41B. The support shaft 42 is disposed on the radially outer side of the rotor 32 (first rotor member 32A) and at the other end in the longitudinal direction of the first and second holding portions 41A and 41B. A through hole is formed at the other end in the longitudinal direction, and for example, a bearing is provided in the through hole. The first and second holding portions 41A, 41B are rotatably supported by the support shaft 42 by inserting the support shaft 42 into the other end bearing. That is, the support shaft 42 is arranged in parallel with the rotation shaft 11 with a space therebetween.

  In addition, the fixing mechanism is provided with a fixing portion that fixes the support shaft 42 to the rotor 32 (first rotor member 32A). In this example, it has plate-shaped 1st and 2nd fixing | fixed part 43A, 43B arrange | positioned at intervals in the axial direction. The first fixing portion 43A holds one end of the support shaft 42 in a non-rotatable state. On the other hand, the second fixing portion 43B holds the other end of the support shaft 42 in a non-rotatable state. The first and second fixing portions 43A and 43B are fixed to the outer peripheral surface of the rotor 32 (first rotor member 32A) using a screw member such as a bolt, for example.

  As described above, the fixing mechanism fixes the cutting device (the cutting blade 10, the drive unit 20, and the like) to the rotor 32 (the first rotor member 32A) via the rotating shaft 11. This fixing mechanism does not interfere with the cutting operation by the cutting blade 10 because the rotation of the rotating shaft 11 is not hindered. The fixing mechanism rotates the cutting device integrally with the first and second holding portions 41A and 41B around the support shaft 42, so that the cutting blade 10 and the outer peripheral surface of the cutting target pipe Pc are rotated. The interval can be changed.

  In this fixing mechanism, when the casing 23 (grip portion) of the drive unit 20 is pushed down radially inward, the rotation of the cutting device or the like around the support shaft 42 is restricted. A locking portion (not shown) is provided for locking so as not to rotate further. For example, the locking portion is provided in the first and second holding portions 41A and 41B. In this case, the rotor 32 side of the first and second holding portions 41A and 41B is set as a locking portion, and the locking portion is brought into contact with the outer peripheral surface of the rotor 32, whereby the casing 23 (grip portion). Restricts the rotation of the cutting device or the like when it is pushed down radially inward. Further, the locking portion may be provided between the first and second holding portions 41A, 41B and the support shaft 42. In this case, the locking portion restricts the rotation of the first and second holding portions 41 </ b> A and 41 </ b> B with respect to the support shaft 42, and is disposed on the outer peripheral surface of the support shaft 42 or the rotor 32, for example.

  In addition, the cover 44 which covers the rotating shaft 11 from the radial direction outer side is provided in this fixing mechanism. The cover 44 is attached to the first and second holding portions 41A and 41B, for example, and can rotate integrally with the cutting device or the like around the support shaft 42.

  Here, the cutting device can change the position of the cutting blade 10 with respect to the outer peripheral surface of the cutting target pipe Pc by rotation about the support shaft 42. That is, the rotation of the cutting device changes the cutting depth of the cutting blade 10 at the time of cutting. On the other hand, if this cutting device cannot stop the rotation about the support shaft 42, there is a possibility that the cutting depth during cutting may vary. This is because, as described above, when the cutting target pipe Pc is cut, the operator pushes down the casing 23 (grip part) of the drive unit 20 in the radial direction so that the cutting blade 10 is moved to the cutting target pipe Pc. It is because it presses against. Therefore, in this tube cutting machine 1, the first and second holding portions 41A and 41B rotated around the axis of the support shaft 42 together with the cutting device such as the rotating shaft 11 are rotated at the positions rotated. The position adjustment part 50 which locks and adjusts the cutting depth of the cutting blade 10 is provided.

  The position adjustment unit 50 includes an extending member 51, a shaft member 52, an operation member 53, a first elastic member 54, a second elastic member 55, and a locking member 56.

  The extending member 51 is a plate-like member attached to the cover 44 by a screw member, welding, or the like, and has a plane extending in a tangential direction with respect to the cutting target pipe Pc and the outer peripheral surface of the rotor 32. The extending member 51 is disposed on the outer side in the radial direction of the rotor 32 (first rotor member 32A) and on the opposite side of the support shaft 42 with respect to the rotating shaft 11.

  The extending member 51 is formed with a circular through hole having a perpendicular direction as an axis in the plane. The shaft member 52 is inserted into the through hole of the extending member 51, and one end thereof is inserted into the groove or hole on the outer peripheral surface of the rotor 32 (first rotor member 32A). One end of the shaft member 52 is fixed to the groove or hole. The shaft member 52 is a cylindrical or columnar shaft, and a male screw is formed on the outer peripheral surface thereof.

  The operation member 53 is a member formed in an annular shape, and a female screw is formed on the inner peripheral surface thereof. The operating member 53 is attached to the shaft member 52 by screwing the female screw into the male screw of the shaft member 52 from the other end side of the shaft member 52. That is, the operation member 53 is attached to the outer side in the radial direction than the extending member 51 in the shaft member 52.

  The first elastic member 54 is inserted into the shaft member 52 between the extending member 51 of the shaft member 52 and the outer peripheral surface of the rotor 32. The first elastic member 54 generates an elastic force in the extending direction between the extending member 51 and the outer peripheral surface of the rotor 32. On the other hand, the second elastic member 55 is attached to the shaft member 52 on the radially outer side than the extending member 51 and is inserted into the shaft member 52 on the radially inner side of the operation member 53. A locking member 56 is attached to the other end of the shaft member 52 in order to prevent the operation member 53 from falling off the shaft member 52. The engaging member 56 has a female screw formed on the inner peripheral surface thereof, and is attached to the shaft member 52 by screwing the female screw with the male screw of the shaft member 52. The second elastic member 55 generates a resilient force in the extending direction between the extending member 51 and the operation member 53.

  In the position adjusting unit 50, when the operator rotates the operation member 53 around one axis, the extension member 51 is pushed up radially outward by the elastic force of the first elastic member 54 in the extending direction. It is done. For this reason, in this case, together with the extending member 51, the first and second holding portions 41A, 41B and the cutting device rotate around the axis of the support shaft 42 and are pushed up. Therefore, in this case, the cutting blade 10 can be separated from the outer peripheral surface of the cutting target pipe Pc. On the other hand, in the position adjusting unit 50, when the operator rotates the operation member 53 around the other axis, the extending member 51 is pushed down radially inward. For this reason, in this case, together with the extending member 51, the first and second holding portions 41A, 41B and the cutting device rotate around the axis of the support shaft 42 and are pushed down. Therefore, in this case, the cutting blade 10 can be brought close to the outer peripheral surface of the cutting target pipe Pc (FIG. 12). Therefore, the position adjusting unit 50 can adjust the cutting depth of the cutting blade 10 by operating the operation member 53 of the operator. The cutting depth is determined according to the rotation angle of the operation member 53. In FIG. 12, for convenience of illustration, a part of the structure of the fixing mechanism, the position adjusting unit 50, and the like are omitted.

When the operator finishes the attachment work up to the rotor 32, the position adjusting unit 50 adjusts the cutting depth (for example, 1 mm) of the cutting blade 10. Thereafter, the operator operates the drive unit 20 to rotate the cutting blade 10. When the operator holds the casing 23 (grip part) and the rotation operation part 32b and rotates the rotor 32 in the circumferential direction, the operation member 53 of the position adjustment part 50 turns the cutting blade 10 being rotated into the cutting target pipe Pc. Go closer (for example, 1 mm). At that time, the extending member 51 moves up and down by the rotation of the operation member 53, and the first elastic member 54 becomes a force in a direction away from the tube, and the cutting blade 10 being cut by the second elastic member 55 is the object to be cut. It plays the role of a damper (cushion) that suppresses separation from the tube Pc. In a state where the pressing of the casing 23 stops, the cutting blade 10 that is rotating by the amount of the cutting depth adjusted by the position adjusting unit 50 cuts the cutting target pipe Pc. The operator operates the rotation operation unit 32b to rotate the rotor 32 once in the circumferential direction while keeping the cutting blade 10 cut into the cutting target pipe Pc. Thereby, the outer peripheral surface side of the cutting target pipe Pc is cut by the adjusted cutting depth. The operator adjusts the cutting depth of the cutting blade 10 again, pushes down the housing 23, rotates the rotor 32 once in the circumferential direction, and cuts the cutting target pipe Pc by the amount of the increased cutting depth. The operator repeats this work by the thickness of the cutting target pipe Pc, thereby dividing the cutting target pipe Pc.

  As described above, in this pipe cutting machine 1, the rotary shaft 11 is disposed outside the stator 31 and the rotor 32 in the radial direction, and the cutting blade 10 and the drive unit 20 are sandwiched between the stator 31 and the rotor 32 in the axial direction. It is arranged. For this reason, this pipe cutting machine 1 can cut | disconnect this cutting object pipe Pc along the circumferential direction, even if the radial direction outer side of the cutting object pipe Pc is a narrow space. In particular, it is desirable that the tube cutting machine 1 is provided with the rotating shaft 11 having a length matching the drive unit 20 so as to be disposed outside the structure St when the tube cutting machine 1 is installed. That is, at least a part of the cutting target pipe Pc is embedded in the structure St, and the cutting target pipe Pc is cut along the inner space of the structure St (the annular space after the suspension is removed). When the location exists, it is desirable that the length of the rotating shaft 11 be longer than the distance between the wall surface on the side of the worker in the structure St and the cut location. Thereby, even if the radial gap (annular space after suspension removal) between the pipe to be cut Pc and the structure St is narrow, the pipe cutting machine 1 moves the pipe to be cut Pc along the circumferential direction. Can be cut.

  Moreover, since this pipe cutter 1 can finely adjust the cutting depth of the cutting blade 10, it can cut only the outer pipe P1 that is the cutting target pipe Pc without damaging the inner pipe P2.

  In addition, the pipe cutting machine 1 is provided with a liquid supply device 60 that supplies a nonflammable liquid (water or the like) to a portion cut by the cutting blade 10. Thereby, this pipe cutting machine 1 can suppress generation | occurrence | production of the spark at the time of a cutting | disconnection. Therefore, this pipe cutting machine 1 can ensure safety when cutting the outer pipe P1 outside the inner pipe P2 through which the combustible gas passes, for example. That is, this pipe cutting machine 1 can cut the cutting target pipe Pc in a place where the use of fire is restricted.

  Furthermore, this pipe cutting machine 1 makes the cutting depth shallower than the thickness of the pipe Pc to be cut, and cuts little by little while moving the rotating cutting blade 10 and the like in the circumferential direction over a plurality of rounds. As a result, the cutting target pipe Pc is divided into a circular cut state. For this reason, this pipe cutting machine 1 is divided by making the cutting depth deeper than the wall thickness of the cutting target pipe Pc and only moving the cutting blade 10 etc. once in the circumferential direction of the cutting target pipe Pc. Can suppress the occurrence of sparks. Therefore, this pipe cutting machine 1 can cut | disconnect the cutting object pipe | tube Pc in the place where use of a fire is restrict | limited, combined with the effect of supply of the fluid to the cutting part mentioned above.

  In addition, this pipe cutting machine 1 can be used not only in one direction but also in the opposite direction when an operator moves the cutting device (the cutting blade 10 or the drive unit 20) together in the circumferential direction. Can move. That is, the tube cutting machine 1 does not have a structure or member that hinders reverse rotation of the cutting device. Therefore, even if the cutting blade 10 is bitten into the cutting target pipe Pc, the pipe cutting machine 1 is bitten by the operator moving the cutting blade 10 or the like in the direction opposite to that at the time of cutting. Can be eliminated. For this reason, this pipe cutting machine 1 can suppress a decrease in durability of the cutting blade 10.

DESCRIPTION OF SYMBOLS 1 Pipe cutting machine 10 Cutting blade 11 Rotating shaft 20 Drive part 31 Stator 32 Rotor 41A 1st holding | maintenance part 41B 2nd holding | maintenance part 42 Support shaft 43A 1st fixing | fixed part 43B 2nd fixing | fixed part 50 Position adjustment part 51 Extension member 52 Axis Member 53 Operation member 54 First elastic member 55 Second elastic member 56 Locking member 60 Liquid supply device Pc Pipe to be cut

Claims (6)

A cutting blade that cuts the tube to be cut while rotating on the radially outer side of the tube to be cut;
A rotation axis that is a rotation axis of the cutting blade, and extends in parallel to the axial direction of the cutting target pipe;
A drive unit for rotating the cutting blade via the rotating shaft;
A cylindrical stator fixed to the cutting target pipe covering the outer peripheral surface of the cutting target pipe between the cutting blade and the drive unit;
A cylindrical rotor that covers the outer peripheral surface of the stator and is capable of relative rotation in the circumferential direction concentrically with the stator;
A rotation operation unit fixed to the rotor and operated by an operator when rotating the rotor relative to the stator;
A holding portion for rotatably holding the rotating shaft located on the radially outer side of the stator and the rotor;
A support shaft that is arranged in parallel to the rotary shaft on the radially outer side of the rotor with a space therebetween, and rotatably supports the holding portion;
A fixing portion for fixing the support shaft to the rotor;
A position adjusting unit that locks the holding unit rotated about the axis of the support shaft together with the rotating shaft at the rotated position, and adjusts a cutting depth of the cutting blade;
A tube cutting machine comprising:
The stator is configured to be divided into a plurality of members in parallel to the axial direction, and the plurality of members in the stator are integrated on the outer peripheral surface of the cutting target pipe to form a cylindrical shape,
The rotor is configured to be divided into a plurality of members in parallel to the axial direction, and the plurality of members in the rotor are integrated on the outer peripheral surface of the stator to form a cylindrical shape,
The position adjustment unit is connected to the first elastic member, the second elastic member, and the holding unit, and is arranged on the outer side in the radial direction of the rotor and on the side opposite to the support shaft with respect to the rotation shaft, An extending member provided between the first elastic member and the second elastic member;
A force acts radially outward on the extending member by the first elastic member, and a force acts radially inward on the extending member by the second elastic member. A tube cutting machine characterized by that. The position adjusting unit has an operation member capable of adjusting the position of the extending member by expanding and contracting the first elastic member and the second elastic member, and adjusting the cutting depth of the cutting blade by the operation member. The pipe cutter according to claim 1, wherein the pipe cutter is configured to be capable of being used. 3. The tube cutting machine according to claim 1, wherein the stator includes an axial center adjustment unit that aligns the axial center of the stator with the axial center of the pipe to be cut. 4. The shaft center adjusting portion includes female screws provided in at least three locations on each of the plurality of members, and at least three male screws that are respectively screwed into the female screws. The tube cutting machine described. The rotor has a friction reducing portion in which a rotating body is interposed between an outer peripheral surface of the stator and an inner peripheral surface of the rotor, and the rotating body is rotatably held by a holding mechanism. The peripheral surface side is arranged so as to protrude from the inner peripheral surface of the rotor toward the outer peripheral surface of the stator and to contact with the outer peripheral surface of the stator. The tube cutting machine according to claim 1. A tube cutting method using the tube cutting machine according to any one of claims 1 to 5,
It is embedded in at least a portion the structure of the previous SL be cut tube, and, if the cut part of the cut target tube along the inner space of said structure is present, the rotary shaft The length is made longer than the distance between the wall surface on the side where the worker is present in the structure and the cutting location .

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