JP2010179384A - Cutter for pipe connection part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and inexpensive cutter for a pipe connection flange, which is easy to mount on and dismount from a pipe or a flange, and easy to carry, and can efficiently and correctly cut a welded part of the flange provided on a pipe connection part, irrespective of a diameter or an installation orientation of the pipe. <P>SOLUTION: The cutter for a pipe connection flange includes: a body 1 provided to be movable in a direction of an arrow C on the outer peripheral surface of the flange 18; an end mill 3 driven by an air motor; an endless chain 4 wound around the outer peripheral surface of the flange 18; a sprocket 5a and a roller 5b pivoted with holders 6 and 6 and engaging with the endless chain 4; a decelerator 7 for transmitting the driving force of an electric motor to the sprocket 5a; an end mill gear for advancing/retreating the end mill 3 in a direction of an arrow A by operating a handle 8a; and movement supporting rollers 9 and 9 pivoted with roller holders 10 and 10 so that they can engage with the flange 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for cutting a flange joint provided in a pipe connection, and in particular, efficiently welds the flange connection while self-running in the circumferential direction while being attached to the outer peripheral surface of the apparatus. The present invention relates to a pipe connection section cutting device that can be excised well.

Generally, the connection part of piping is joined via a pair of flange to which the butt | matching surface was welded, in order to prevent the leakage of an internal fluid. Furthermore, the butted surface of the flange is sealed using a lip ring or the like.
When cutting and inspecting the connection part of the pipe, it is necessary to remove the welding of the flange, and it is necessary to weld the flange again at the end of the inspection. Usually, the inspection of the connecting portion of the pipe is periodically repeated, and each time a work such as removing the flange welding or welding the flange again occurs. Therefore, when welding is removed from the joint portion of the flange, it is necessary to accurately remove the weld by accurately positioning the tool with respect to the joint portion so that a welding operation performed thereafter is facilitated. Conventionally, after performing the above-described alignment using a dedicated jig, welding is removed over the entire circumference of the flange joint while manually moving the tool in the circumferential direction of the pipe. However, such a method has a problem in that it takes time to align the tool and move it in the circumferential direction, resulting in poor work efficiency.

Several inventions and devices have already been disclosed for cutting the outer peripheral surface of the pipe over the entire circumference, although the welding applied to the joint portion of the flange is not excised.
For example, Patent Document 1 discloses an invention relating to an apparatus that cuts a part of an existing pipe such as a water pipe in a watertightly sealed casing under the name “existing pipe cutting apparatus”.
The invention disclosed in Patent Document 1 includes a cutting unit composed of a cutting bit that cuts the peripheral wall of an existing water pipe along the circumferential direction, a guide unit that rotatably holds the cutting unit in the circumferential direction, and a cutting unit. And a drive unit that rotationally drives the unit.
In the “existing pipe cutting device” having such a structure, the peripheral wall of the existing water pipe is arranged along the circumferential direction by rotationally driving the guide portion to which the cutting unit is attached around the pipe axis of the rotating existing water pipe. Can be cut.

Patent Document 2 discloses an apparatus that cuts a canopy seal portion between a nozzle of a nuclear reactor vessel and a tubular member joined to the same under the name of “device for cutting a circumferential seal weld”. An invention related to this is disclosed.
The invention disclosed in Patent Document 2 is an apparatus for cutting a circumferential seal weld formed between a small-diameter tubular object and a large-diameter tubular object, and an inner cylinder can be attached to and detached from the end of the small-diameter tubular object. A single drive motor is attached to a disk-shaped fixed base fixed to one end of the inner cylinder, and a cutting tool and a roller cutter are respectively mounted on a rotating base that is rotatably supported on the outer peripheral surface of the inner cylinder. It is arranged so that it can be fed separately, and the drive force of the drive motor is transmitted to the rotation base, the cutting tool and the roller cutter by a power transmission mechanism.
According to the “circumferential seal welded cutting device” having such a structure, the outermost part of the circumferential seal welded part is mechanically scraped by a cutting tool, and the remaining innermost part is a roller cutter. It has the effect of being pushed out by. In this case, it is possible to reduce the amount of generated chips.

JP 2007-38316 A Japanese Patent No. 3035182

  However, in the invention disclosed in Patent Document 1 which is the above-described prior art, there is a problem that the diameter of a water pipe that can be cut is limited. In addition, there is a problem that the water pipe cannot be cut unless it is installed in the horizontal direction. Furthermore, since the apparatus is large and heavy, and the structure is complicated, there is a problem that the apparatus is not easily mounted and transported, and the manufacturing cost increases. In addition, the present invention does not have a structure that can efficiently cut out the welding of the flange provided at the connection portion of the pipe.

  Further, the invention disclosed in Patent Document 2 has a problem that it cannot be applied when the diameter and installation direction of the tubular member are different. In addition, there is a problem that it is not easy to reduce the size and weight of the apparatus. Furthermore, there was a problem that it could not be manufactured at low cost. Moreover, also in this invention, the welding of the flange provided in the connection part of piping cannot be excised efficiently.

  The present invention has been made in response to such a conventional situation, and is easily attached to, detached from, and transported to a pipe and a flange, and is provided at the connection portion regardless of the diameter and installation direction of the pipe. It is an object of the present invention to provide a small and inexpensive pipe connection cutting device capable of cutting out the welding of the flange efficiently and accurately.

In order to achieve the above object, a pipe connection portion cutting device according to the first aspect of the present invention is a pipe connection portion cutting device that cuts a joint portion of a flange provided in a pipe connection portion, and is orthogonal to the axial direction of the pipe. An endless chain wound around the outer peripheral surface of the flange, a sprocket that is rotatably installed in a plane perpendicular to the axial direction of the pipe, and a sprocket drive means that rotationally drives the sprocket. A cutting tool installed so as to be movable forward and backward with respect to the radial direction of the pipe and rotatable about an axis parallel to the radial direction of the pipe, tool driving means for rotationally driving the cutting tool, and moving the cutting tool forward or And a notch amount adjusting means for retreating, and the sprocket is fastened to the flange by an endless chain.
According to such a structure, the pipe connection cutting device is fastened to the outer peripheral surface of the flange by the endless chain, and is guided by the endless chain by the rotation of the sprocket and moves on the outer peripheral surface of the flange in the circumferential direction. Has an effect. In addition, since the rotation axis of the cutting tool is orthogonal to the circumferential direction of the pipe, the cutting resistance is unlikely to fluctuate even when the moving direction of the cutting tool is reversed. That is, it has the effect that the machining state is stable regardless of the moving direction of the cutting tool.

According to a second aspect of the present invention, in the pipe connection part cutting device according to the first aspect, the movable support roller is installed so as to be movable in the circumferential direction of the pipe while engaging with the flange. It is characterized by having.
In the pipe connection part cutting device having such a structure, the cutting tool is positioned with respect to the axial direction of the pipe by the moving support roller. Further, when the pipe is installed in the vertical direction, the weight of the pipe connection cutting device applied to the endless chain is reduced by the moving support roller.

According to a third aspect of the present invention, in the pipe connection portion cutting device according to the first or second aspect, the endless chain is provided with chain adjusting means for adjusting the tension of the endless chain by changing the interval between the flange and the sprocket. Is constituted by a plurality of frame-like bodies, and this frame-like body has a hooking portion that is key-shaped in a side view so as to be connectable to each other.
According to such a structure, the ring-shaped endless chain is partially stripped by releasing the engagement state of any two continuous frame-like bodies, and becomes a belt-like shape. Further, by engaging the two frame-like bodies, the endless chain becomes circular again. Therefore, attachment to a flange or piping is easy. Further, the length of the endless chain is adjusted by increasing / decreasing the number of frame-like bodies in the endless chain formed into a belt shape. The endless chain wound around the flange or the like is adjusted to an appropriate tension by the chain adjusting means. Thereby, the effect | action of the endless chain of fastening a piping connection part cutting device to a flange etc. is exhibited more reliably.

According to a fourth aspect of the present invention, in the pipe connection part cutting device according to any one of the first to third aspects, the sprocket driving means includes an electric motor, and a power supply unit that supplies electricity to the electric motor. The motor rotation speed adjusting means and a clutch that transmits or cuts off the driving force of the electric motor to the sprocket.
In the pipe connection part cutting device having such a structure, the moving speed and moving direction of the cutting tool with respect to the circumferential direction of the pipe are switched by changing the rotating speed and rotating direction of the sprocket.

According to a fifth aspect of the present invention, in the pipe connection part cutting device according to any one of the first to fourth aspects, the tool driving means includes an air motor and an air for supplying air to the air motor via an air hose. And a flow rate adjusting valve that is interposed in the air hose and controls the flow rate of the air.
In the pipe connection part cutting device having such a structure, the tool driving means is reduced in size and weight compared to the case of using an electric motor.

  For example, when a tool such as a disk cutter that rotates in a plane perpendicular to the axial direction of the pipe is moved in the circumferential direction along the outer peripheral surface of the flange, the frictional resistance generated for the tool differs depending on the moving direction. Therefore, when the moving direction is reversed, it is necessary to readjust the tool cutting amount, rotational speed or feed amount (movement amount in the circumferential direction) again. On the other hand, in the pipe connection part cutting device according to claim 1 of the present invention, since the moving direction of the cutting tool does not affect the cutting resistance, the moving direction of the cutting tool can be easily reversed. . Accordingly, by appropriately reversing the moving direction of the cutting tool, it is possible to reduce the number of turns of the cutting tool with respect to the pipe and prevent the cables from being tangled with the pipe. In addition, since it has a structure that cuts the welds of the joints while being self-propelled in the circumferential direction while being fastened to the outer peripheral surface of the flange, the joints are cut regardless of the installation direction of the piping. It is possible. In addition, since a member for supporting the apparatus main body is not required, it is possible to reduce the size and to reduce the manufacturing cost.

  In the invention according to claim 2 of the present invention, the welding tool or the like can be accurately cut by applying the cutting tool to the joint portion of the flange. As a result, the flange can be reused. Further, even when used for cutting a connection portion of a pipe arranged in the vertical direction, the required specification of the tensile strength for the endless chain is relaxed, so that the manufacturing cost can be reduced.

  In the invention according to claim 3 of the present invention, attachment to and removal from the flange or the like is easy. Further, the length and tension of the endless chain can be adjusted according to the diameter of the flange or the like. Therefore, it is possible to reliably prevent an accident in which the pipe connection portion cutting device is detached from the endless chain and falls regardless of the diameter of the flange or the like.

  In invention of Claim 4 of this invention, the moving speed of the cutting tool with respect to the circumferential direction of piping can be stabilized. In addition, the moving direction of the cutting tool can be easily switched as compared with the case of using an air motor.

  In the invention according to claim 5 of the present invention, since the tool driving means is reduced in size and weight, it is easy to attach to, remove from, and carry the flange.

It is an external view of the Example of the piping connection part cutting device which concerns on embodiment of this invention. It is a top view of the piping connection part cutting device of a present Example. It is a front view of the piping connection part cutting device of a present Example. (A) is a side view of the piping connection part cutting device of a present Example, (b) is a front view of a movement support roller. (A) thru | or (c) are the figures which expanded a part of endless chain which comprises the piping connection part cutting device of a present Example, (a) is a front view, (b) and (c) are side views. is there.

  An example of a pipe connection part cutting device according to the best mode of the present invention will be described with reference to FIGS.

  FIG. 1 is an external view of an example of a pipe connection cutting device according to an embodiment of the present invention. 2 and 3 are a plan view and a front view, respectively, of the pipe connection cutting device of the present embodiment. Further, FIG. 4A is a side view of the pipe connection cutting device of the present embodiment, and FIG. 4B is a front view of the moving support roller. In FIG. 1 to FIG. 4, illustration of components other than the apparatus main body such as power cables is omitted. 5 (a) to 5 (c) are enlarged views of a part of the endless chain constituting the pipe connection portion cutting device of this embodiment, (a) is a front view, and (b) and (c). Is a side view.

  The pipe connection part cutting device of the present embodiment includes a main body 1 that is installed on the outer peripheral surface of the flange 18 so as to be movable in the circumferential direction of the pipe (hereinafter referred to as the direction of arrow C), a fueling device (lubricator), and An air hose provided with a flow control valve, a power cable, an air source and a power source connected to the main body 1 via the air hose and the power cable, and an operation panel, respectively. The operation panel is provided with a clutch switch and a power ON / OFF switch in addition to a power switch, an electric motor operation / stop switch, a rotation speed adjustment knob, and a rotation direction switch.

  As shown in FIGS. 1 to 3, the main body 1 is driven by an air motor built in a casing 2 a (see FIG. 3) and around an axis parallel to the radial direction of the pipe (hereinafter referred to as the direction of arrow A). The end mill 3 that rotates to cut away the weld 20, the endless chain 4 wound around the outer peripheral surface of the flange 18 so as to be orthogonal to the axial direction of the pipe (hereinafter referred to as the direction of arrow B), A sprocket 5a and a roller 5b that are rotatable in a plane perpendicular to the direction and can be moved back and forth in the direction of the arrow A and mesh with the endless chain 4, and a holder 6 that supports the sprocket 5a and the roller 5b. , 6 and the electric motor and the clutch are incorporated in the casing 2b, and the reduction gear 7 is composed of a plurality of gears for transmitting the driving force of the electric motor to the sprocket 5a, and is incorporated in the casing 2c. The end mill gear for moving the end mill 3 back and forth in the direction of arrow A, the handle 8a for rotating the end mill gear, and the roller holders 10 and 10 can be engaged with the flange 18 and perpendicular to the direction of arrow B. There are provided moving support rollers 9 and 9 that are rotatably supported in a plane.

  The power cable, the power source, the electric motor, the clutch, and the speed reducer 7 constitute sprocket driving means for rotationally driving the sprocket 5a. The electric motor is a brushless DC motor (a DC motor without a rectifying brush) and has a built-in motor rotation speed adjusting means. Accordingly, the rotation speed can be adjusted and the rotation direction can be switched by operating the rotation speed adjustment knob and the rotation direction switch on the operation panel. Note that when the rotation speed of the electric motor is changed, the rotation speed of the sprocket 5a changes, and accordingly, the movement speed of the end mill 3 attached to the main body 1 in the direction of arrow C changes.

  The clutch is a so-called electromagnetic tooth clutch that transmits torque by meshing teeth (tooth). By operating a clutch changeover switch of the operation panel, transmission of driving force of the electric motor to the speed reducer 7 and switching between cutoff are switched. It is possible. Then, the transmission of the driving force of the electric motor to the speed reducer 7 is temporarily interrupted by operating the clutch changeover switch, the rotation direction changeover switch of the operation panel is operated to reverse the rotation direction of the electric motor, and then the clutch changeover switch again. Is operated to transmit the driving force of the electric motor to the speed reducer 7, whereby the rotation direction of the sprocket 5a is reversed. Accordingly, the moving direction of the end mill 3 with respect to the circumferential direction of the pipe is switched.

  Further, the air hose, the air source, and the air motor constitute tool driving means for rotationally driving the end mill 3. And it has the structure which can change the rotational speed of an air motor by operating the flow control valve and changing the flow rate of the air in an air hose. The air motor is characterized by generating a large torque for its small size compared to the electric motor. Therefore, by using the air motor, the tool driving means is reduced in size and weight.

  Thus, in the pipe connection part cutting device of the present embodiment, since the electric motor incorporating the motor rotation speed adjusting means is used as the sprocket driving means, the end mill 3 is moved in the direction of the arrow C as compared with the case where the air motor is used. Can be moved stably. In addition, since the electric motor can be easily switched in the rotation direction as compared with the air motor, the moving direction of the end mill 3 can be easily switched. Furthermore, since the tool driving means is reduced in size and weight, the main body 1 can be reduced in size and weight. In this case, attachment and removal of the main body 1 with respect to the flange 18 and transportation of the main body 1 can be easily performed.

Note that the end mill gear operated via the handle 8a constitutes a cutting amount adjusting means of the end mill 3. Moreover, in order to connect an air hose and a power cable to the casings 2a and 2b, an air hose coupler 11 and a connector 12 are provided, respectively, and an end mill shaft 3a projects from the front surface of the casing 2c.
Further, the support pillars 13a, 13a arranged in parallel to the direction of the arrow A are connected to each other by the connecting plate 14 arranged in parallel to the direction of the arrow B, and the base end part is the main body. 1 is fixed. And the holder 6 is hold | maintained by the support | pillars 13a and 13a so that it can advance / retreat to the direction of the arrow A. FIG. A screw shaft 13b having a handle 8b at the distal end and a base end fixed to the holder 6 is disposed in parallel to the columns 13a and 13a, and screw holes 14a (see FIG. 4 (a)). Therefore, when the handle 8b is rotated, the screw shaft 13b moves relative to the connecting plate 14 and the support columns 13a and 13a. As a result, the holder 6 moves forward or backward in the direction of arrow A, and accordingly, the sprocket 5a and the roller 5b also move forward or backward in the direction of arrow A. As a result, the tension of the endless chain 4 changes. That is, the sprocket 5a, the roller 5b, and the support pillars 13a and 13a whose tip parts are connected by the connecting plate 14, the holding tool 6 that is held by the support pillars 13a and 13a so as to be movable back and forth in the direction of arrow A, and the handle at the tip part. The screw shaft 13b having 8b constitutes a chain adjusting means for adjusting the tension of the endless chain 4.

  As shown in FIGS. 4A and 4B, the moving support roller 9 has a structure in which stepped disk portions 9a and 9b are provided at both ends of a support shaft (not shown). The roller holder 10 is held in parallel with the direction of the arrow B and is rotatable. Further, a guide plate 15 is screwed to the side surface of the roller holder 10 using screws 16 and 16. In addition, the screw hole 15a (refer FIG.4 (b)) of the guide plate 15 in which the screw | thread 16 is inserted is formed long in the direction of the arrow B. As shown in FIG. When the screws 16 are loosened, the guide plate 15 can be moved up and down by up to about 2 mm in parallel with the direction of the arrow B. A guide roller 17 is attached to one end of the guide plate 15 so as to be rotatable about an axis parallel to the tapered surface 18a of the flange 18 (see FIG. 4B).

When the main body 1 is attached to the flange 18, as shown in FIG. 4B, the stepped disk portions 9 a and 9 b of the moving support roller 9 have end surfaces 23 a and 23 b that are flat surfaces 18 b of the flange 18 and taper surfaces of the flange 19. Each abuts against 19a. Thereby, the end mill 3 is positioned with respect to the weld 20. In addition, the space | interval of the stepped disk parts 9a and 9b can be adjusted by utilizing a spacer.
Further, the mounting position of the guide plate 15 can be adjusted so that the guide roller 17 contacts the tapered surface 18 a of the flange 18. Thereby, the said positioning of the end mill 3 with respect to the welding 20 is performed more correctly.

As shown in FIGS. 5A and 5B, the endless chain 4 is formed in an annular shape by a plurality of frame-like bodies 21 connected to each other, and the sprocket 5a is formed in the opening 21b of the frame-like body 21. The teeth 22 are inserted and meshed with the endless chain 4. In addition, a hooking portion 21a having a key shape in side view is provided on one side of the frame-like body 21, and a hooking portion 21a of another frame-like body 21 can be hooked on a side facing the hooking portion 21a. It has a shape. In addition, in this application, the side view key shape includes the case of a side view substantially key shape.
As shown in FIG. 5C, when the two adjacent frame bodies 21 and 21 are rotated so as to form approximately 90 ° in a side view, one frame body 21 is moved in the direction of arrow D. The engagement state of the frame-like bodies 21 and 21 is released. When the engaged state of the frame-like bodies 21 and 21 is released, the annular endless chain 4 is cut off at that location and becomes a belt shape. And if the frame-like bodies 21 and 21 of the cut part are engaged again, the endless chain 4 will become cyclic | annular. In this way, the endless chain 4 is easily disconnected or connected. Therefore, attachment to and removal from the flange 18 can be easily performed. Further, another frame-like body 21 can be newly added by performing a procedure reverse to the above-described procedure. That is, the length of the endless chain 4 can be freely adjusted by removing or adding the frame-like body 21.

The pipe connection cutting device having such a structure has an effect that the main body 1 is fastened to the outer peripheral surface of the flange 18 by the endless chain 4. And the tension | tensile_strength of the endless chain 4 wound around the flange 18 is adjusted appropriately by a chain adjustment means so that this effect | action can be exhibited reliably.
Moreover, in the pipe connection part cutting device of the present embodiment, the main body 1 moves in the direction of the arrow C while being guided by the endless chain 4 as the sprocket 5a rotates, and is driven by the air motor to rotate the end mill 3. The weld 20 is cut off over the entire circumference of the flange 18. The rotation axis of the end mill 3 is orthogonal to the moving direction (the direction of the arrow C), and the cutting resistance is unlikely to fluctuate even when the moving direction is switched to the reverse direction (the reverse direction to the arrow C). For this reason, the working state by the end mill 3 is stable regardless of the moving direction. Further, the end mill 3 is positioned by the moving support roller 9 in the direction of arrow B. Since the moving support roller 9 is engaged with the flange 18, the weight of the main body 1 applied to the endless chain 4 is reduced by the moving support roller 9 even when the pipe is installed in the vertical direction. Become.

  In general, when a tool such as a disk cutter that rotates in a plane perpendicular to the axial direction of the pipe is moved in the circumferential direction along the outer peripheral surface of the flange 18, different frictional resistance is generated with respect to the tool depending on the moving direction. To do. In this case, when reversing the moving direction of the tool, it is necessary to readjust the cutting amount, rotational speed, or feed amount (moving amount in the circumferential direction) of the tool again. On the other hand, in the pipe connection part cutting device of the present embodiment, since the moving direction of the end mill 3 does not affect the cutting resistance, the moving direction of the end mill 3 can be easily reversed. Accordingly, by appropriately reversing the moving direction of the end mill 3, it is possible to reduce the number of turns of the end mill 3 with respect to the pipe and to prevent the cables from being tangled with the pipe. Moreover, in the piping connection part cutting device of the present embodiment, the weld 20 of the joint is cut by the main body 1 that is self-propelled in the circumferential direction while being fastened to the outer peripheral surface of the flange 18. The connecting portion can be cut regardless of the direction. In addition, since a member for supporting the main body 1 is unnecessary, the apparatus can be reduced in size and the manufacturing cost can be reduced. Furthermore, since the end mill 3 is accurately positioned in the direction of the arrow B by the moving support roller 9, the weld 20 applied to the joint portion of the flange 18 can be surely cut off. Thereby, the flange 18 can be reused. Even when the pipes are arranged in the vertical direction, the weight of the main body 1 applied to the endless chain 4 is reduced, so that the required specification of the tensile strength for the endless chain 4 is relaxed. Therefore, the endless chain 4 can be made inexpensive and the manufacturing cost can be reduced. Furthermore, the length and tension of the endless chain 4 can be adjusted according to the diameter of the flange 18. Therefore, it is possible to reliably prevent an accident that the main body 1 is detached from the endless chain 4 and falls, regardless of the diameter of the flange 18.

  The pipe connection part cutting device of the present invention is not limited to the structure shown in the present embodiment. For example, the main body 1 may be structured to be fastened to the outer peripheral surface of the pipe instead of the flange 18. Further, a structure in which the power source is mounted on the main body 1 may be adopted. In this case, since the power cable is shortened, there is no possibility of entanglement with the piping and the flange 18. Furthermore, the end mill 3 may be driven by an electric motor instead of an air motor. In this case, an air hose is unnecessary, and the main body 1 becomes the pipe connection cutting device itself. If the required accuracy of positioning the end mill 3 with respect to the axial direction of the pipe is not high, the moving support roller 9 can be omitted. In this case, it is possible to use this apparatus also for cutting the connection portion of the pipe not provided with the flange 18 or cutting the portion other than the connection portion of the pipe.

  As described above, the inventions described in claims 1 to 5 are applicable when cutting a tubular member to which a flange is attached.

DESCRIPTION OF SYMBOLS 1 ... Main body 2a-2c ... Casing 3 ... End mill 3a ... End mill shaft 4 ... Endless chain 5a ... Sprocket 5b ... Roller 6 ... Holder 7 ... Reduction gear 8a, 8b ... Handle 9 ... Movement support roller 9a, 9b ... Stepped disk Part 10: Roller holder 11 ... Air hose coupler 12 ... Connector 13a ... Post 13b ... Screw shaft 14 ... Connecting plate 14a ... Screw hole 15 ... Guide plate 15a ... Screw hole 16 ... Screw 17 ... Guide roller 18 ... Flange 18a ... Tapered surface 18b ... Flat surface 19 ... Flange 19a ... Tapered surface 20 ... Welding 21 ... Frame-shaped body 21a ... Engagement part 21b ... Opening part 22 ... Teeth 23a, 23b ... End face AD ... Arrow

Claims (5)

In a pipe connection part cutting device for cutting a flange joint provided in a pipe connection part,
An endless chain wound around the outer peripheral surface of the flange so as to be orthogonal to the axial direction of the pipe;
A sprocket that is rotatably installed in a plane perpendicular to the axial direction of the pipe and meshes with the endless chain;
Sprocket driving means for rotationally driving the sprocket;
A cutting tool installed so as to be movable back and forth with respect to the radial direction of the pipe and rotatable about an axis parallel to the radial direction of the pipe;
Tool driving means for rotationally driving the cutting tool;
A cutting amount adjusting means for moving the cutting tool forward or backward, and
The sprocket is fastened to the flange by the endless chain.   The pipe connection part cutting device according to claim 1, further comprising a moving support roller that is installed on the outer peripheral surface of the flange so as to be movable in the circumferential direction of the pipe while engaging with the flange. Chain adjusting means for adjusting the tension of the endless chain by changing the interval between the flange and the sprocket,
The endless chain is constituted by a plurality of frame-like bodies,
The pipe connection part cutting device according to claim 1 or 2, wherein the frame-like body has a hook part that is key-shaped so as to be connectable to each other.   The sprocket driving means comprises an electric motor, a power supply for supplying electricity to the electric motor, a motor rotation speed adjusting means, and a clutch for transmitting or interrupting the driving force of the electric motor to the sprocket. The piping connection part cutting device according to any one of claims 1 to 3, wherein: The tool driving means includes an air motor, an air source that supplies air to the air motor via an air hose, and a flow rate adjustment valve that is interposed in the air hose and controls the flow rate of the air. The piping connection part cutting device according to any one of claims 1 to 4.