JP5474388B2 - Pipe cutting device - Google Patents

Description

  The present invention relates to a tube cutting device for cutting a predetermined portion of an existing fluid pipe in a casing having a split structure and having an opening that can be opened and closed, and watertightly surrounding an existing fluid pipe.

  The conventional pipe cutting device is placed in a case that surrounds the existing fluid pipe in a water-tight manner, and is mainly connected to the main body attached to the existing fluid pipe and a cutting tool to advance and retract in the radial direction of the existing fluid pipe. A cutting unit that has a stepping screw portion that is rotatably attached to the main body portion, and a kicker portion that is fixedly attached in the vicinity of the rotation path of the cutting unit. The kicker piece of the kicker portion is in contact with and engaged with the stepping screw portion, the stepping screw portion is rotated, the cutting tool advances in the radial direction of the existing fluid pipe, and the existing fluid pipe is cut.

  In this type of pipe cutting device, the amount of advancement that advances in the radial direction of the existing fluid pipe in the cutting bite when the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe is changed by appropriately changing the number of kicker portions. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 3-14996 (page 4, FIG. 16)

  In the tube cutting device described in Patent Document 1, in order to adjust the amount of radial step in the cutting bite per rotation of the cutting unit, the number of existing fluid tubes is set to an appropriate number for each cutting. Since the kicker portion must be attached or removed, there is a risk that the adjustment work of the stepping amount of the cutting tool is troublesome.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide a tube cutting device capable of easily adjusting a stepping amount of a cutting tool.

In order to solve the above-mentioned problem, the tube cutting device of the present invention comprises:
A pipe cutting device that has a split structure and has an opening that can be opened and closed, and that cuts a predetermined portion of the existing fluid pipe in a casing that watertightly surrounds the existing fluid pipe,
A main body fixedly attached to the existing fluid pipe, a cutting unit attached to the main body so as to be rotatable in a circumferential direction of the existing fluid pipe, and fixedly attached to the main body near the rotation path of the cutting unit A kicker section, and
The cutting unit is connected to the cutting bit capable of cutting the peripheral wall of the existing fluid pipe along the circumferential direction, and connected to the cutting bit, and rotates around a rotation axis, thereby removing the cutting bit of the existing fluid pipe. A stepping screw part that moves forward and backward by a predetermined amount according to the rotation angle of the rotation in the radial direction;
The kicker portion abuts and engages with the stepping screw portion that rotates in the circumferential direction, and rotates the stepping screw portion about the rotation axis, and the kicker piece with respect to the stepping screw portion An adjustment portion for adjusting the degree of contact;
The adjusting portion is characterized in that the rotation angle of the stepping screw portion can be changed by adjusting the contact degree.
According to this feature, the rotation angle of the stepping screw portion is changed only by operating the adjusting unit that adjusts the degree of contact of the kicker piece with the stepping screw portion, and the cutting unit changes the circumferential direction of the existing fluid pipe by one. Since the amount of stepping in the radial direction of the cutting bit per rotation is adjusted, an adjustment operation for adjusting the cutting depth of the cutting bit in the existing fluid pipe according to the material of the existing fluid pipe can be easily performed.

The tube cutting device of the present invention comprises:
The stepping screw portions are positioned at substantially equal intervals in the circumferential direction of the rotating shaft, extend radially about the rotating shaft, and have a plurality of radiating portions capable of abutting engagement with the kicker piece. With
The kicker piece is adapted to sequentially abut and engage with one of the plurality of radiating portions each time the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe.
The adjustment unit moves the kicker piece forward and backward toward the rotation shaft, so that the kicker piece sequentially contacts and engages with the radiating unit adjacent to and engaging with the radiating unit that has been engaged with the previous contact. The degree of contact and the kicker piece are adjusted at least to a second degree of contact that sequentially contacts and engages with one or more radiating parts from the radiating part that has been contacted and engaged last time. It is characterized by being.
According to this feature, the radiating portions are positioned at substantially equal intervals in the circumferential direction of the rotating shaft, so that special rotating means for changing the rotation angle of the stepping screw portion per rotation of the cutting unit is provided on the rotating blade. Without being able to adjust the rotation angle of the stepping screw part per rotation of the cutting unit with only the rotating blades, the cutting unit is already installed by adjusting the first contact degree or the second contact degree. Each time the circumferential direction of the fluid pipe is rotated, the stepping screw portion can be reliably rotated at different rotation angles according to the degree of contact.

The tube cutting device of the present invention comprises:
By forming the tip of the kicker piece to be gradually tapered , the kicker piece is adjacent to the radiating portion that abuts and engages with the kicker piece in a state where the rotary blade is rotating around the rotation axis. And a radiating part that is structured to avoid interference.
According to this feature, the tip portion of the kicker piece is gradually tapered, so that the kicker piece and the radiating portion that abuts and engages with the kicker piece in a state where the rotary blade rotates around the rotation axis. Since the radiating part adjacent to the radiating part avoids interference, the kicker piece interferes with the radiating part adjacent to the radiating part that abuts and engages with it. Can be prevented.

The tube cutting device of the present invention comprises:
The structure for avoiding the interference has a shape in which the tip portion of the kicker piece is gradually tapered, and the radiating portion adjacent to the kicker piece is widened in the circumferential direction of the rotation shaft with respect to the kicker piece. It is characterized by an arranged structure.
According to this feature, the tip portion of the kicker piece is gradually tapered, and the adjacent radiating portion is arranged with a gap in the circumferential direction of the rotating shaft with respect to the kicker piece, thereby radiating portion. Therefore, even if the rotation angle of the stepping screw part per rotation of the cutting unit is larger than that of the first contact degree, the kicker piece is not contacted with the previous contact degree. Without interfering with the radiating portion sandwiched between the combined radiating portion and the radiating portion that contacts and engages next time, the radial step amount of the cutting tool per one rotation of the cutting unit increases, and a relatively soft existing fluid pipe When cutting the existing fluid pipe, it is possible to cut the existing fluid pipe by reducing the number of rounds of the cutting unit required for cutting the existing fluid pipe.

It is a front view which shows the state in which the upper case is attached surrounding the existing fluid pipe | tube. It is a partial cross section figure which shows the state by which the tube cutting device has been arrange | positioned at the cutting part. It is a partial sectional view showing a tube cutting device. It is a partial side sectional view showing a tube cutting device. (A) is sectional drawing which shows the cutting unit and kicker part of FIG. 3, (b) is an upper sectional view of (a). It is a top sectional view showing the cutting unit and kicker part which show the state where the contact degree is adjusted by the adjustment part. It is sectional drawing which shows the state which the cutting tool has moved to the internal diameter direction of the existing fluid pipe | tube. (A)-(d) is explanatory drawing which shows the state which a radiation | emission part rotates 1 pitch for every rotation of cutting unit by contact | abutting engagement with a kicker piece, (e)-(h) These are explanatory drawing which shows the state which a radiation | emission part rotates 2 pitches in time series similarly. (A)-(d) is explanatory drawing which shows the state in which the radiation | emission part of a modification rotates 1 pitch for every rotation of cutting unit by contact | abutting engagement with a kicker piece, and (e)- (H) is explanatory drawing which shows the state which the radiation | emission part of a modification rotates 2 pitches in time series similarly.

  EMBODIMENT OF THE INVENTION The form for implementing the pipe | tube cutting device which concerns on this invention is demonstrated below based on an Example.

  An embodiment of the present invention will be described with reference to FIGS. In the following description, the front side in FIG. 3 is the front side of the tube cutting device, and the left and right sides in FIG.

  In general, in an existing fluid pipe that is buried in the ground and through which clean water flows, a water control body disposing step is performed in which a water control body is disposed in a predetermined water-free state at a predetermined location of the existing fluid pipe in order to control the flow of water. In this type of water control body arrangement step, in order to arrange the water control body at a predetermined location of the existing fluid pipe, the predetermined location of the existing fluid pipe is cut in a non-continuous water state using a pipe cutting device. In this embodiment, a pipe cutting device that cuts an existing fluid pipe in an indefinite water state will be described.

  1 is an existing fluid pipe in which the fluid embedded in the soil and flowing inside is clean water. After cleaning the existing fluid pipe P, the existing fluid pipe P is a fixing member 101 made of H steel and concrete, Reinforced and fixed at 101.

  Next, the existing fluid pipe P is surrounded in a watertight manner using the housing 2. Here, the structure of the casing 2 will be described. As shown in FIG. 2, the casing 2 has a split structure, and mainly includes an upper case 2d and a lower case 2e having a split structure, and a valve inside. And an on-off valve 2a provided with a body 2b.

  The upper case 2d surrounds the existing fluid pipe P along the outer peripheral surface by the lower case 2e. The lower case 2e is supported by a jack 75 and supports the lower case 2e protruding in the front-rear direction of the drawing. A member W is formed.

  The on-off valve 2a is detachably provided on the upper part of the upper case 2d, and the on-off valve 2a constitutes an openable / closable opening of the present invention. As shown in FIG. 2, a work cylinder 11 and a lid portion 12 that are in watertight communication with the housing 2 via the open / close valve 2a in an open state are detachably provided on the open / close valve 2a.

  The lid 12 has an insertion hole 12a through which one end of the drive long shaft 106 extends to the outside of the work cylinder 11, and the inside of the housing 2 and the work cylinder 11 with the drive long shaft 106 inserted through the insertion hole 12a. And a sealing material 112 for maintaining the sealed state. In addition, the sealing material 112 is attached to the upper part of the cover part 12 in the state fitted to the insertion hole 12a, and the drive long shaft 106 is inserted into the sealing material 112 in a watertight manner.

  Next, the enclosure of the casing will be described. As shown in FIG. 1, first, in the lower case 2 e of the casing 2 that surrounds the existing fluid pipe P in a watertight manner, the existing fluid pipe P in the casing 2 is formed. In the state where the lower guide 4b (see FIG. 3) of the guide portion 4 in the tube cutting device 1 for cutting the excision portion K is supported, the lower case 2e and the lower guide 4b are shown below the existing fluid pipe P by the suspension means 102. It arrange | positions so that the outer peripheral surface in the side may be surrounded, and the supporting member W of the lower case 2e is supported with the some jack 75. FIG. Then, as shown in FIG. 2, the tube cutting device 1 is disposed in the excision K in the housing 2.

  Here, the structure of the tube cutting device 1 will be described. As shown in FIGS. 3 and 4, the tube cutting device 1 mainly includes a guide portion 4 as a main body portion fixedly attached to an existing fluid pipe P, A cutting unit 3 that is rotatably mounted in the circumferential direction of the existing fluid pipe P, a kicker unit 30 that is fixedly attached to the guide unit 4 in the vicinity of the rotation path of the cutting unit 3, and a rotational drive generated by a drive motor 6 described later. It comprises a drive transmission portion 5 that rotates the cutting unit 3 by transmitting force through the expansion joint portion 107. Further, the upper guide 4a and the lower guide 4b constituting the guide portion 4 are fixedly held on the outer peripheral surface of the existing fluid pipe P in the casing 2 that is watertightly sealed outside the existing fluid pipe P. (See FIG. 2).

  A plurality of bolts 28 provided along the circumferential direction of the upper guide 4a and the lower guide 4b are screwed in the inner diameter direction and come into contact with the outer peripheral surface of the existing fluid pipe P, whereby the upper guide 4a and the lower guide 4b. Is positioned and fixed with respect to the existing fluid pipe P.

  On the upper part of the guide part 4, a drive shaft 7 ′ fixedly connected to the expansion joint part 107, a drive shaft 7 having a gear 7 a meshing with a gear 7 a ′ provided at the tip of the drive shaft 7 ′, A pair of drive sprockets 8 provided at both ends of the drive shaft 7 to which the rotational drive force is applied via the drive long shaft 106, the expansion joint 107, and the drive shaft 7 'by the drive motor 6 that generates the rotational drive force; The above-described drive transmission unit 5 is connected, and the drive motor 6 protrudes outside the housing 2 and is detachably disposed on the drive transmission unit 5 (see FIG. 2).

  A pair of driven sprockets 9 which are composed of an upper sprocket 9a and a lower sprocket 9b having a vertically divided structure and are rotatable in the circumferential direction of the existing fluid pipe P are disposed at both ends of the guide portion 4.

  As shown in FIG. 5A, fixing rings 33 protrude from the both ends of the guide portion 4 around the outer periphery of the existing fluid pipe P. A recess that can be fitted to the fixed ring 33 is formed on the back surface of the driven sprocket 9, and the driven sprocket 9 is fitted to the fixed ring 33 so as to be slidable around the pipe axis of the existing fluid pipe P. .

  The back ring 32 is integrated with the driven sprocket 9 by a plurality of back locking bolts 40 on the back of the driven sprocket 9 fitted to the fixed ring 33 so that the driven sprocket 9 does not fall off the fixed ring 33. While being held, it can rotate around the pipe axis of the existing fluid pipe P.

  As shown in FIG. 4, the pair of driven sprockets 9 are respectively connected to the upper pair of drive sprockets 8 via a wound endless chain 10. By operating the drive motor 6 described above, a drive long shaft 106 to which the drive motor 6 is attached, an expansion joint portion 107 to which the drive long shaft 106 is detachably connected, and drive shafts 7 'and 7 are provided. The driving sprocket 8 is driven through this, and a rotational force is applied to the driven sprocket 9 by this driving, and the driven sprocket 9 goes around the outer periphery of the existing fluid pipe P.

  Further, the cutting units 3 are fixedly arranged at four locations at equal intervals on the outer surfaces of the pair of driven sprockets 9, and the outer periphery of the existing fluid pipe P can be rotated along with the rotation of the driven sprockets 9. The existing fluid pipe P can be cut around the outer periphery by the cutting tool 19. That is, the cutting unit 3 is attached to the guide portion 4 via the driven sprocket 9.

  The cutting unit 3 will be described in detail. As shown in FIGS. 3 to 5, the cutting unit 3 mainly includes the cutting bit 19 described above and a support member 18 that supports the cutting bit 19 in a fixed manner, and a rotating shaft. A stepping screw portion 20 that moves the cutting tool 19 and the support member 18 forward and backward by a predetermined amount according to the rotation angle of the existing fluid pipe P by rotating around the O, and the stepping screw portion 20 in the outer circumferential direction. A base member 14 and a plate member 14a having a cylindrical opening U that covers the base member 14; a shaft support member 15 fixedly connected to the base member 14 and rotatably inserted into the step screw portion 20; The protective member 16 is disposed between the screw portion 20 and the outer peripheral surface of the existing fluid pipe P and prevents the chips discharged from the existing fluid pipe P from entering the stepping screw portion 20.

  As shown in FIG. 5 (a), the cutting tool 19 is attached to the outer peripheral portion of the support member 18, and the mounting portion 19b extends to the existing fluid pipe P side. And a cutting part 19a for cutting the fluid pipe P. The plate member 14a is attached to the base member 14 with a screw 14c inserted through a long hole formed in the vertical direction (not shown), thereby covering an open portion (not shown) of the base member 14. Then, the plate member 14 a is moved along the elongated hole with respect to the base member 14, so that the opening portion is opened, and the cutting tool 19 can be attached to and detached from the support member 18.

  As shown in FIGS. 5A and 5B, the stepping screw portion 20 includes a shaft member 17 having a screw portion 17a that is screwed into the support member 18, and an upper portion of the shaft member 17 in FIG. And a rotating blade 21 provided on the surface.

  The rotary blades 21 are positioned at substantially equal intervals in the circumferential direction of the rotation axis O, extend radially around the rotation axis O, and can be in contact with and engaged with a kicker piece 31 of the kicker section 30 described later. 34 (12 in this embodiment) and a fitting portion 35 having a recess into which the load member 23 provided on the shaft support member 15 can be fitted. The radiating portion 34 is formed in a shape that gradually tapers in a direction away from the rotation axis O. Further, as shown in FIG. 5B, the load member 23 has a spring body therein, and is pressed and urged toward the fitting portion 35 by the elastic force of the spring body.

  The protective member 16 is a bendable bending member made of an elastic material such as rubber. The protective member 16 covers the opening U of the base member 14 and is in a state before being brought into contact with the tapered surface 19c formed on the mounting portion 19b. It is attached to the base member 14 so as to contact the portion 19a.

  Further, the protection member 16 has a main body portion 16a fixed to the base member 14, and an abutting portion 16b that abuts on an attachment portion 19b that moves in the inner diameter direction. The contact portion 16b is formed by two incisions directed inward from one side of the protection member 16, and the contact portion can be bent with respect to the main body portion 16a (see FIG. 7). ).

  As shown in FIGS. 3 to 5, the kicker portions 30 are respectively arranged on the left and right of the upper guide 4 a along the rotation path in FIG. 3, and fixed to the upper guide 4 a by a plurality of screws 130. An adjusting portion 26 that adjusts the degree of contact of the kicker piece 31 with respect to the stepping screw portion 20 described later, and the stepping screw portion 20 that makes contact with the stepping screw portion 20 that rotates in the circumferential direction of the existing fluid pipe P. There is an operating portion 25 that is movable between a contact position that will be described later and a later-described retracted position that avoids contact engagement with the stepping screw portion 20.

  The adjustment portion 26 mainly has a tip portion that gradually tapers toward the rotation axis O, and is arranged at the contact position to rotate the stepping screw portion 20 around the rotation axis O, and a fixing portion. 27, a movable member 121 that is movable relative to the movable member 121, a housing member 125 that is fixedly attached to the movable member 121, and that partially accommodates the kicker piece 31, a cam member 123 that presses the kicker piece 31, and a cam member 123 A screw member 127 to be connected and a screw support member 128 fixedly attached to the moving member 121 and rotatably supporting the screw member 127 are provided. The cam member 123 has an eccentric shape having a short diameter portion 123a and a long diameter portion 123b.

  As shown in FIG. 5B, the moving member 121 is formed with a plurality of elongated circular insertion holes 121a, which are formed in the insertion hole 121a and the fixing portion 27 corresponding to the insertion hole 121a. By inserting the bolt 122 integrally into a screw hole (not shown), the moving member 121 is fixed to the fixing portion 27 in a state where the bolt 122 is loosely fitted into the elongated circular insertion hole 121a. Therefore, with the configuration of the moving member 121, the adjustment unit 26 is supported so as to be movable with respect to the fixed unit 27.

  The moving member 121 is formed on the upper and lower sides of the fixed portion 27 and is fitted in guide portions 27a and 27a extending to the front side of the drawing. The moving member 121 is guided by the guide portions 27a and 27a. Thus, the position of the kicker piece 31 can be adjusted in the horizontal direction in the figure without being displaced in the vertical direction in the figure.

  The housing member 125 is formed with a housing hole 125a for housing a part of the kicker piece 31, and a ring member 124 is fixed to the housing member 125 on the right side in the drawing in the housing hole 125a. Is done.

  Further, between the ring member 124 and a ring-shaped retaining ring 126 fixedly attached to the kicker piece 31, the elastic member 24 is inserted through the kicker piece 31.

  The cam member 123 is initially operated through the screw member 127 and the connecting piece 129 connected to the screw member 127, with the short diameter portion 123a abutting the illustrated left end portion of the kicker piece 31. Since the cam member 123 is rotated by rotating the operation unit 25 and the long diameter portion 123b of the cam member 123 is in contact with the kicker piece 31, the solid line kicker piece 31 is illustrated. It moves toward the right (see the dashed line in FIG. 5B).

  5B, the position of the kicker piece 31 that contacts the short diameter portion 123a of the cam member 123 is in contact with the radiation portion 34 of the rotary blade 21 of the stepping screw portion 20, as indicated by the solid line. The position of the kicker piece 31 that contacts the long diameter portion 123b of the cam member 123 is in contact with the rotary blade 21 of the stepping screw portion 20 as shown by the alternate long and short dash line. Is in position. In this contact position, the adjustment unit 26 can adjust the contact degree of the stepping screw unit 20 with the rotary blade 21.

  Further, as described above, since the elastic member 24 is disposed between the ring member 124 and the ring member 124 and the retaining ring 126, the operation unit is configured to move the kicker piece 31 from the retracted position to the contact position. By rotating 25, the retaining ring 126 of the kicker piece 31 approaches the ring member 124, and the elastic member 24 is held between the retaining ring 126 and the ring member 124.

  On the other hand, by rotating the operation unit 25 from the contact position of the kicker piece 31, the elastic return force of the elastic member 24 is applied to the retaining ring 126 so that the kicker piece 31 maintains the contact state with the cam member 123. The kicker piece 31 returns from the contact position to the retracted position by this elastic return force.

  Thus, in the vicinity of the rotation path of the cutting unit 3 that rotates in the circumferential direction of the existing fluid pipe P, the kicker portion 30 is fixedly disposed on the outer surface of the upper guide 4a, and the kicker portion 30 includes a kicker piece. 31 protrudes so that the stepping screw part 20 can be rotated. Therefore, when the cutting unit 3 that rotates in the circumferential direction of the existing fluid pipe P passes near the kicker portion 30, the radiating portion 34 of the rotary blade 21 of the stepping screw portion 20 contacts the kicker piece 31. The rotating blades 21 are rotated by a predetermined amount until they are engaged and the cutting unit 3 has passed through the vicinity of the kicker portion 30 and the engagement is released (see FIGS. 3 and 4).

  Therefore, each time the cutting unit 3 rotates in the circumferential direction of the existing fluid pipe P and passes through the kicker portion 30, the radiating portion 34 of the rotary blade 21 of the stepping screw portion 20 contacts and engages with the kicker piece 31. Then, the cutting tool 19 fixedly supported by the support member 18 screwed into the screw portion 17a of the shaft member 17 of the stepping screw portion 20 moves in the inner diameter direction by an amount per unit. Thus, the cutting edge 19 rotates the outer periphery while cutting the outer peripheral wall of the existing fluid pipe P by a certain amount, thereby cutting the existing fluid pipe P (see FIGS. 3 and 4).

  Further, as shown in FIG. 5B, when the radiating portion 34 of the rotating blade 21 is rotated by a predetermined amount by contact engagement with the kicker piece 31, the fitting portion 35 is similarly rotated by a predetermined amount, and the load member 23 is fitted into the recess of the fitting portion 35 that faces after the fitting portion 35 rotates by a predetermined amount. That is, since the fitting portion 35 is held by the load member 23 that is pressed and urged by the spring body after rotating by a predetermined amount, the cutting tool 19 similarly proceeds in the inner diameter direction of the existing fluid pipe P per unit. Held at a point.

  Therefore, when cutting the existing fluid pipe P, the force in the backward direction with respect to the cutting tool 19 due to the sliding contact with the outer wall of the existing fluid pipe P is received by the fitting of the load member 23 and the recess of the fitting portion 35. Therefore, the cutting position of the cutting tool 19 can be held without the rotating blade 21 rotating in the reverse direction.

  As a matter of course, since the concave portion formed in the fitting portion 35 and the radiating portion 34 are provided at the same predetermined angular interval, the radiating portion 34 becomes a kicker piece when the existing fluid pipe P is cut. Since the load member 23 is fitted in the facing concave portion at a point rotated by a predetermined amount by 31, the cutting tool 19 is securely held at the point moved by the unit amount given by the predetermined amount rotation. The

  Next, the arrangement of the tube cutting device 1 will be described. First, the upper sprocket 9a to which the cutting unit 3 is fixedly disposed is attached to the upper guide 4a of the guide portion 4, and the lower portion to which the cutting unit 3 is firmly disposed. The sprocket 9b is attached to the lower guide 4b of the guide portion 4. And the fixing | fixed part 27 is fixed to the upper guide 4a with the screw | thread 130 (refer FIG.3 and FIG.4).

  Next, as shown in FIG. 1, the drive transmission portion 5 and the upper guide 4a of the guide portion 4 are attached to the lower guide 4b, and the bolts 28 provided on the upper guide 4a and the lower guide 4b (see FIG. 6). ) To fix the guide portion 4 to the existing fluid pipe P.

  Then, as shown in FIG. 6, the long diameter portion 123 b of the cam member 123 is brought into contact with the kicker piece 31 by operating the operation portion 25. Then, with the bolt 122 loosely connected to the moving member 121, the adjustment portion 26 is moved with respect to the fixed portion 27, the position of the kicker piece 31 is changed as appropriate, and the degree of contact of the kicker piece 31 with the stepping screw portion 20. Are adjusted (see FIG. 5A).

  Here, the adjustment of the contact degree of the kicker piece 31 with respect to the stepping screw portion 20 will be specifically described.

  As shown by the solid line in FIG. 6, the adjustment portion 26 moves the kicker piece 31 forward and backward in the linear direction with respect to the stepping screw portion 20, thereby adjusting the contact degree of the kicker piece 31 with respect to the stepping screw portion 20. The bolt 122 is tightened and the moving member 121 is fixed to the fixed portion 27. The contact position of the solid line kicker piece 31 shown in FIG. 6 is the contact position of the kicker piece 31 shown in FIGS. 8A to 8D. In FIG. 3 indicates a rotation direction in which the stepping screw portion 20 rotates the existing fluid pipe P in the circumferential direction. Further, at this contact position, the separation dimension between the tip of the kicker piece 31 and the rotation axis O in the linear direction in which the kicker piece 31 moves forward and backward toward the rotation axis O is M (see FIG. 5A). .

  First, as shown in FIG. 8 (a), when the stepping screw portion 20 rotates in the rotation direction, the radiating portion 34a and the kicker piece 31 come into contact with each other, and the stepping screw portion 20 is By rotating in the rotation direction, the rotating blade 21 rotates in the direction of the outlined arrow about the rotation axis O while the contact portion between the radiating portion 34a and the kicker piece 31 is changed.

  Then, as shown in FIG. 8 (b), the rotating blade 21 rotates about the rotation axis O, and the contact portion between the radiating portion 34a and the kicker piece 31 becomes the tip of each other, and further the stepping screw As the portion 20 rotates in the rotation direction, the radiating portion 34a and the kicker piece 31 are separated from each other. As described above, the fitting portion of the stepping screw portion 20 is held by the load member that is pressed and urged by a spring body after rotating by a predetermined amount, so that the radiating portion 34a and the kicker piece 31 are separated from each other. At the same time, the load member is fitted into the recess of the fitting portion, and the rotating blade 21 stops rotating.

  Next, when the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe, the radiating portion 34b and the kicker piece 31 are again brought into contact with each other as shown in FIG. As the blade 21 rotates about the rotation axis O, the radiating portion 34b and the kicker piece 31 are separated from each other, and the load member is fitted into the concave portion of the fitting portion, as shown in FIG. The rotating blade 21 stops rotating. That is, the rotary blade 21 is rotated by 1 pitch, that is, 30 ° from the state of FIG. Thereafter, similarly, although not shown, the cutting unit makes one turn in the circumferential direction of the existing fluid pipe from the state of FIG. The blades 21 rotate one pitch (30 °).

  That is, the adjustment unit moves the kicker piece 31 forward and backward toward the rotation axis O so as to have the separation dimension M, so that the adjustment unit radiates each time the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe. The part 34 rotates by one pitch, that is, the kicker piece 31 can be adjusted so as to sequentially contact and engage with the adjacent radiating part and the adjacent radiating part. The contact degree constitutes the first contact degree of the present invention.

  The cutting tool moves in the inner diameter direction by a predetermined amount corresponding to the rotation of one pitch of the radiating portion 34 every time the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe, and the existing fluid pipe Will be cut.

  Next, adjustment of the second contact degree different from the first contact degree will be described.

  As shown by the alternate long and short dash line in FIG. 6, the degree of contact of the kicker piece 31 with the stepping screw portion 20 is adjusted by the adjusting portion 26 so that the kicker piece 31 is further advanced toward the stepping screw portion 20 than described above. After adjusting, the bolt 122 is tightened and the moving member 121 is fixed to the fixed portion 27. 6 is the contact position of the kicker piece 31 shown in FIGS. 8 (e) to 8 (h), and at this contact position, the kicker piece 31 is rotated about the rotation axis. The separation dimension between the tip of the kicker piece 31 and the rotating shaft O in the linear direction moving forward and backward toward O is N shorter than the separation dimension M (see FIG. 5A).

  First, as shown in FIG. 8 (e), when the stepping screw portion 20 rotates in the rotation direction (see the black arrow in the drawing), the radiation portion 34k and the kicker piece 31 come into contact with each other. When the stepping screw portion 20 rotates in the rotation direction, the rotating blade 21 rotates in the direction indicated by the white arrow around the rotation axis O while the contact portion between the radiation portion 34k and the kicker piece 31 changes. .

  Then, as shown in FIG. 8 (f), the rotating blade 21 rotates about the rotation axis O, the contact portion between the radiating portion 34k and the kicker piece 31 becomes the tip of each other, and further the stepping screw As the portion 20 rotates in the rotation direction, the radiating portion 34k and the kicker piece 31 are separated from each other, the load member is fitted into the concave portion of the fitting portion, and the rotary blade 21 stops rotating.

  Next, as the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe, as shown in FIG. 8G, the radiating portion 34l is skipped, and the radiating portion 34m and the kicker piece 31 are brought into contact with each other. As a result, the rotary blade 21 rotates about the rotation axis O, the radiating portion 34m and the kicker piece 31 are separated from each other, and the load member is fitted into the concave portion of the fitting portion. ), The rotary blade 21 stops rotating. That is, the rotary blade 21 rotates by 2 pitches, that is, 60 ° from the state of FIG. Similarly, although not shown, the cutting unit makes one turn in the circumferential direction of the existing fluid pipe from the state of FIG. 8 (h), so that the radiating part 34n is skipped, and the radiating part 34p and the kicker piece 31 are separated. Abutting and engaging, the rotary blade 21 rotates 2 pitches (60 °).

  That is, the adjustment unit moves the kicker piece 31 toward and away from the rotation axis O so as to have the separation dimension N, so that each time the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe, The pitcher 31 can be adjusted so that the kicker piece 31 is sequentially abutted and engaged with every other radiating part from the radiating part that was previously engaged with the abutment. The contact degree to be adjusted constitutes the second contact degree of the present invention.

  Further, each time the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe, the cutting tool moves in the inner diameter direction by a predetermined amount corresponding to the rotation of the two pitches of the radiating portion to cut the existing fluid pipe. Will do.

  As described above, since the radiating portions 34 are positioned at substantially equal intervals in the circumferential direction of the rotation axis O, the rotation angle of the stepping screw portion 20 per rotation of the cutting unit 3 is changed by the rotating blade 21. Without providing a speed reduction means, the rotation angle of the stepping screw portion 20 per rotation of the cutting unit 3 can be adjusted only by the rotary blade 21, and the first contact degree or the second contact degree can be adjusted. With this adjustment, each time the cutting unit 3 rotates in the circumferential direction of the existing fluid pipe P, the stepping screw portion 20 can be reliably rotated at different rotation angles in accordance with the degree of contact.

  Further, as described above, the kicker piece 31 has a tip portion that gradually tapers toward the rotation axis O. That is, in a state where the rotary blade 21 is rotating around the rotation axis O, the kicker piece 31 and the radiating part adjacent to the radiating part that abuts and engages with the kicker piece 31 are structured to avoid interference. Therefore, it is possible to prevent the rotation failure of the rotary blade 21 due to the kicker piece 31 interfering with the radiating portion adjacent to the radiating portion that is in contact with and engaged with the kicker piece 31.

  After the adjustment of the first contact degree or the second contact degree, the kicker piece 31 is moved to the retracted position by operating the operation unit 25. Next, the endless chain 10 is wound around the driven sprocket 9 and the drive sprocket 8, a motor base (not shown) is connected to the drive shaft 7 ′, and the drive motor 6 is attached to the motor base. Then, the drive motor 6 is operated and the cutting unit 3 is trial-rotated in the circumferential direction of the existing fluid pipe P in an unloaded state, and it is confirmed whether there is any abnormality in the tension of the endless chain 10 (FIGS. 2 and 2). 3).

  After the trial rotation of the cutting unit 3, the motor base and the drive motor 6 are removed. Then, the upper case 2d of the housing 2 is attached to the upper part of the lower case 2e so as to surround the upper side of the existing fluid pipe P in the figure, and both cases 2d and 2e are fixed to the existing fluid pipe P. Then, packings 69, 69, push wheels Q, Q, and rubber rings 68, 68 are attached to the side openings of the upper case 2d and the lower case 2e, respectively, and the side openings are sealed (see FIG. 2).

  Next, as shown in FIG. 2, the on-off valve 2a is attached to the upper part of the upper case 2d. Then, water is applied to the inside of the housing 2, that is, the upper case 2d, the lower case 2e, and the on-off valve 2a, and a predetermined water pressure is applied, and a water pressure test inside the housing 2 is performed. After the water pressure test, the water in the housing 2 is drained, the work cylinder 11 is attached to the upper part of the on-off valve 2a, and the lid 12 is attached to the upper part of the work cylinder 11 (see FIG. 2).

  Then, as shown in FIG. 2, the expansion joint 107 is connected to the drive shaft 7 ′ of the tube cutting device 1 disposed in the cutting section K, and the other end of the drive long shaft 106 inserted into the insertion hole 12 a. Connect between.

  Specifically, first, the expansion joint 107 is attached to the drive shaft 7 ′ of the tube cutting device 1, and the drive long shaft 106 into which the motor base 108 is inserted is inserted into the sealing material 112 and the insertion hole 12 a. In this state, one end side of the drive long shaft 106 extends outward from the work cylinder 11 and is exposed. Then, the expansion joint 107 and the drive long shaft 106 are connected, and the drive motor 6 is coupled to the motor base 108.

  Next, the tube cutting process will be described. The drive motor 6 is attached to the drive long shaft 106, and the drive motor 6 is operated to transmit the rotational driving force to the expansion joint portion 107 via the drive long shaft 106. By this transmission, the cutting unit 3 rotates, and the cutting screw unit 20 contacts the kicker piece 31 each time the cutting unit 3 rotates in the circumferential direction of the existing fluid pipe P and passes through the kicker unit 30. 5a, the cutting part 19a of the cutting tool 19 comes into contact with the contact part 16b of the protection member 16, and the support member 18 and the cutting tool 19 are unit. Step by step in the inner diameter direction. As the support member 18 and the cutting tool 19 are stepped, the leading edge of the cutting tool 19 comes into contact with the outer peripheral wall of the existing fluid pipe P, and the existing fluid pipe P is cut by a predetermined amount as shown in FIG. . By this cutting, the existing fluid pipe P is cut at two cut surfaces at the cut portion K, that is, a pipe piece (not shown) between the cut surfaces is cut off from the existing fluid pipe P.

  As described above, in the tube cutting device 1 according to the embodiment, the rotation angle of the stepping screw portion 20 can be adjusted only by operating the adjusting portion 26 that adjusts the degree of contact of the kicker piece 31 with the stepping screw portion 20. Since the amount of stepping in the radial direction of the cutting tool 19 when the cutting unit 3 makes one rotation in the circumferential direction of the existing fluid pipe P is adjusted, the existing fluid pipe P according to the material of the existing fluid pipe P is adjusted. Adjustment work for adjusting the cutting depth of the cutting tool 19 can be easily performed.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in this embodiment, the fluid flowing inside the existing fluid pipe P is clean water, but the fluid is not necessarily limited to clean water, and may be, for example, industrial water, or in a gas or gas-liquid mixed state. The present invention can also be applied to a fluid pipe through which a fluid flows.

  Moreover, in the said Example, the kicker part 30 is arrange | positioned in the vicinity of the rotation path of one side, ie, two sets, that is, a plurality of the kicker parts 30 are disposed in the vicinity of the rotation path of the one side. Compared with the case where the cutting unit 3 increases the amount of the cutting tool 19 that advances in the diameter direction per rotation that rotates along the circumferential direction of the existing fluid pipe P, it is necessary to cut the existing fluid pipe P. Although the number of rounds of the cutting unit 3 can be reduced, it is not always necessary that there are two types. For example, only one type may be provided according to the material of the existing fluid pipe P such as a ductile cast iron pipe or a steel pipe. And three or more types may be arranged.

  Further, in the above embodiment, two sets of kickers 30 are arranged in the vicinity of the rotation path on one side, so that each time the cutting unit 3 goes around the existing fluid pipe P, two sets of kickers 31 are used. The stepping screw portion 20 is driven twice. For example, only one kicker piece 31 is arranged at the contact position according to the material of the ductile cast iron pipe or steel pipe of the existing fluid pipe P, and the other kicker piece By arranging 31 at the retracted position, it is possible to adjust the amount by which the cutting unit 3 advances in the diameter direction of the cutting bite 19 per rotation that rotates along the circumferential direction of the existing fluid pipe P.

  In this embodiment, the stepping screw portion 20 has twelve radiating portions 34 that are positioned at substantially equal intervals in the circumferential direction of the rotation axis O. However, the present invention is not limited to this. As shown in FIG. 9 (a), the rotating blade 21 'is 6 so that the adjacent radiating portions are positioned with a wider interval in the circumferential direction of the rotation axis O'. It may have one radiation part 34 '.

  9A to 9D, each time the cutting unit rotates once in the circumferential direction of the existing fluid pipe (see the black arrow in the figure), the radiating portion 34 ′ rotates in the direction of the white arrow in the figure. 9 (e) to 9 (f), each time the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe (see the black arrow in the drawing), the radiating portion 34 'has two pitches shown in white. It shows that it rotates in the direction of the pull arrow.

  Thus, the number of the radiating portions 34 ′ is reduced because the radiating portions adjacent to the kicker pieces 31 ′ are arranged with a gap in the circumferential direction of the rotation axis O ′ with respect to the kicker pieces 31 ′. Therefore, even if the rotation angle of the stepping screw portion 20 ′ per rotation of the cutting unit 3 is larger than the first contact degree, the kicker piece 31 ′ does not contact the previous contact. Without interfering with the radiating portion sandwiched between the engaged radiating portion and the radiating portion that contacts and engages next time, the radial step amount of the cutting tool per rotation of the cutting unit increases, and the existing soft and relatively soft When the fluid pipe is cut, the existing fluid pipe can be cut by reducing the number of rounds of the cutting unit required for cutting the existing fluid pipe.

  Further, in the present embodiment, the adjustment unit 26 is configured so that the kicker piece 31 rotates two pitches every time the cutting unit 3 makes one rotation in the circumferential direction of the existing fluid pipe P. The second abutment degree is adjusted so as to sequentially abut and engage with the radiating portions located at every other place. However, the adjustment is not limited to this, and for example, the adjustment unit is configured so that the cutting unit is arranged around the existing fluid pipe. Every time the direction is rotated, the second contact degree in which the kicker piece rotates by 3 pitches or more, that is, sequentially contacts and engages with two or more radiating portions from the radiating portion that has been contacted and engaged last time. You may adjust it.

  Furthermore, in addition to the first contact degree, the adjusting unit has a second contact degree in which the kicker pieces sequentially contact and engage with every other radiating part from the radiating part with which the kicker piece has been in contact with the previous contact. The kicker piece may be adjusted to the third contact degree in which the kicker pieces are sequentially contacted and engaged with every second radiation part from the radiation part that was previously contacted and engaged. That is, the adjustment unit may be adjustable to a plurality of different contact degrees where one or more kicker pieces are located.

DESCRIPTION OF SYMBOLS 1 Pipe cutting device 2 Case 2a On-off valve (opening part)
3 Cutting unit 4 Guide part (main part)
19 Cutting tool 20, 20 'Step screw part 21, 21' Rotary blade 26 Adjusting part 30 Kicker part 31, 31 'Kicker piece 34, 34' Radiation part K Cutting part O Rotating shaft P Existing fluid pipe

Claims (4)

A pipe cutting device that has a split structure and has an opening that can be opened and closed, and that cuts a predetermined portion of the existing fluid pipe in a casing that watertightly surrounds the existing fluid pipe,
A main body fixedly attached to the existing fluid pipe, a cutting unit attached to the main body so as to be rotatable in a circumferential direction of the existing fluid pipe, and fixedly attached to the main body near the rotation path of the cutting unit A kicker section, and
The cutting unit is connected to the cutting bit capable of cutting the peripheral wall of the existing fluid pipe along the circumferential direction, and connected to the cutting bit, and rotates around a rotation axis, thereby removing the cutting bit of the existing fluid pipe. A stepping screw part that moves forward and backward by a predetermined amount according to the rotation angle of the rotation in the radial direction;
The kicker portion abuts and engages with the stepping screw portion that rotates in the circumferential direction, and rotates the stepping screw portion about the rotation axis, and the kicker piece with respect to the stepping screw portion An adjustment portion for adjusting the degree of contact;
The said cutting part can change the rotation angle of the said stepping screw part by adjustment of the said contact degree, The pipe cutting device characterized by the above-mentioned. The stepping screw portions are positioned at substantially equal intervals in the circumferential direction of the rotating shaft, extend radially about the rotating shaft, and have a plurality of radiating portions capable of abutting engagement with the kicker piece. With
The kicker piece is adapted to sequentially abut and engage with one of the plurality of radiating portions each time the cutting unit makes one rotation in the circumferential direction of the existing fluid pipe.
The adjustment unit moves the kicker piece forward and backward toward the rotation shaft, so that the kicker piece sequentially contacts and engages with the radiating unit adjacent to and engaging with the radiating unit that has been engaged with the previous contact. The degree of contact and the kicker piece are adjusted at least to a second degree of contact that sequentially contacts and engages with one or more radiating parts from the radiating part that has been contacted and engaged last time. The tube cutting device according to claim 1, wherein: By forming the tip of the kicker piece to be gradually tapered , the kicker piece is adjacent to the radiating portion that abuts and engages with the kicker piece in a state where the rotary blade is rotating around the rotation axis. The tube cutting device according to claim 2, wherein the radiating portion is configured to avoid interference. The structure for avoiding the interference has a shape in which the tip portion of the kicker piece is gradually tapered, and the radiating portion adjacent to the kicker piece is widened in the circumferential direction of the rotation shaft with respect to the kicker piece. The tube cutting device according to claim 3, wherein the tube cutting device is arranged.

Images