JP2013221613A - Fluid pipe cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pipe cutting device which can miniaturize and lighten the whole device, and allows a tip edge member of shaft member to cut a fluid pipe by driving the shaft member by a rotationally driving means and a movement driving means.SOLUTION: In a fluid pipe cutting device, a holding member 12 is arranged which holds or releases a shaft member 8, a rotationally driving means gives a rotationally driving force with respect to the holding member 12, a shaft member 8 held by the holding member 12 is composed so that it may be rotated or moved in such a way that the movement driving means allows the holding member 12 to move in an axial direction of the shaft member 8, and a contact section 22 which contacts with a peripheral surface of the shaft member 8 in the holding member 12 is composed of a molding system frictional material.

Description

  According to the present invention, a casing is attached to a fluid pipe in a sealing manner, a case body communicating with the opening of the casing is provided in a sealing manner, and a shaft member having a blade member connected to the tip is rotated in the circumferential direction. A rotation drive means and an advance / retreat drive means for moving the shaft member in the axial direction are installed outside the casing and the case body, and the shaft member is driven by the rotation drive means and the advance / retreat drive means. The present invention relates to a fluid pipe cutting device in which the blade member cuts the fluid pipe.

  A conventional work gate valve device (fluid pipe cutting device) has a case body (housing) attached to a fluid pipe, and an attachment portion and a gate valve are sequentially attached to the case body. A case body) is attached, and a hole saw (blade member) attached to the lower end of the shaft member is sent from the perforating machine toward the fluid pipe while rotating to perforate the fluid pipe (see, for example, Patent Document 1) .

  Further, the shaft member to which the hole saw (blade member) is attached is a long member having a length from the inside of the drilling machine to the position where the fluid pipe is drilled. In such a drilling machine, the hole saw is rotated. In order to send it out toward the fluid pipe, it has a main body that can accommodate the shaft member over its entire length, and a rotary drive means such as a drive motor is provided at the projecting end of the shaft member, and a support for supporting the shaft member Advancing / retreating drive means using a screw mechanism that feeds out members and shaft members is provided (see, for example, Patent Document 2).

Japanese Patent No. 4353560 (5th page, Fig. 4) JP 2007-71239 A (page 5, FIG. 4)

  However, in the drilling machine used for the operations described in Patent Documents 1 and 2, the advance / retreat drive means that feeds out while supporting the shaft member needs to have a drive stroke larger than the movement stroke of the shaft member. There is a problem that the size of the device must be formed according to the movement stroke of the member, resulting in an increase in the size of the advancing / retreating drive means, and a reduction in the overall size and weight of the apparatus.

  The present invention has been made paying attention to such problems, and the fluid pipe cutting in which the blade member at the tip of the shaft member cuts the fluid pipe by driving the shaft member by the rotation driving means and the advance / retreat driving means. An object of the present invention is to provide a fluid pipe cutting device capable of reducing the size and weight of the entire device.

In order to solve the above problems, a fluid pipe cutting device of the present invention comprises:
A rotation driving means for sealingly attaching the casing to the fluid pipe, providing a case body communicating with the opening of the casing in a sealing manner, and rotating a shaft member having a blade member connected to the tip in the circumferential direction; Advancing / retreating drive means for moving the shaft member in the axial direction is installed outside the casing and the case body, and the blade member is driven by driving the shaft member by the rotation driving means and the advance / retreat driving means. A fluid pipe cutting device for cutting the fluid pipe,
A gripping member that grips or releases the shaft member is provided, and the rotational driving means applies a rotational driving force to the gripping member, and the advance / retreat driving means advances and retracts the gripping member in the axial direction of the shaft member. By doing so, the shaft member gripped by the gripping member is rotated or advanced and retracted, and the contact portion of the gripping member that comes into contact with the outer peripheral surface of the shaft member is made of a mold friction material. It is characterized by that.
According to this feature, the rotation driving force that can cut the fluid pipe with the blade member via the outer peripheral surface of the shaft member can be transmitted from the rotation driving means to the shaft member by the holding member that holds the shaft member. In particular, a high frictional force is applied between the outer peripheral surface of the shaft member and the contact portion of the grip member because the contact portion of the grip member is made of a mold type friction material having a high friction coefficient and low wear. be able to. Further, the shaft member can be advanced and retracted in the axial direction together with the gripping member by the advancing and retracting drive means, and once the shaft member is gripped by the gripping member, the shaft member is advanced in the axial direction with a predetermined driving stroke, After releasing the grip, only the grip member is retracted to grip the shaft member again, and the shaft member can be advanced again. By repeating this drive stroke, the length of the drive stroke of the advance / retreat drive means is It can be configured to be shorter than the moving stroke that the member moves, and the advancing / retreating drive means can handle a longer shaft member. As a result, the advancing / retreating drive means can be reduced in size and weight, and the entire apparatus can be reduced in size In addition, the weight can be reduced.

The fluid pipe cutting device of the present invention comprises:
An uneven portion for improving a frictional force with the contact portion is formed on an outer peripheral surface of a portion corresponding to the grip member in the axial direction of the shaft member.
According to this feature, the concavo-convex portion of the outer peripheral surface of the shaft member bites into the contact portion formed of the mold friction material, and increases the frictional force between the contact portion of the gripping member and the outer peripheral surface of the shaft member. Can do.

The fluid pipe cutting device of the present invention comprises:
The shaft member is inserted from the insertion port of the case body, and a seal member is provided for sealing between the inner peripheral surface of the insertion port and the outer peripheral surface of the shaft member, and the case body and the shaft member And the fluid pipe is cut in an uninterrupted state.
A depth dimension of the uneven portion is 10 to 500 μm.
According to this feature, the concavo-convex portion of the outer peripheral surface of the shaft member bites into the contact portion formed of the mold friction material, and increases the frictional force between the contact portion of the gripping member and the outer peripheral surface of the shaft member. If it is an uneven part with a depth dimension of 10 to 500 μm, the sealing performance of the housing and the case body can be maintained without affecting the sealing performance of the sealing member.

The fluid pipe cutting device of the present invention comprises:
The concavo-convex portion is formed by arranging concavo-convex portions of a predetermined shape as a geometric pattern.
According to this feature, the uneven portion in which uneven portions of a predetermined shape are arranged as a geometric pattern can increase the frictional force between the outer peripheral surface of the shaft member and the contact portion formed of the mold friction material, In addition, since the concavo-convex portion is uniformly formed over the entire circumference of the shaft member, the concavo-convex portion of the shaft member and the surface of the seal member have uniform adhesion over the entire circumference of the shaft member, and are sealed. Can increase the sex.

The fluid pipe cutting device of the present invention comprises:
The shaft member is inserted from the insertion port of the case body, and a seal member is provided for sealing between the inner peripheral surface of the insertion port and the outer peripheral surface of the shaft member, and the case body and the shaft member And the fluid pipe is cut in an uninterrupted state.
The case body includes at least two seal members that are spaced apart in the axial direction of the shaft member, and the uneven portion is an outer peripheral surface of a portion corresponding to the gripping member in the axial direction of the shaft member And a smooth smooth surface is formed at other portions, and the smooth surface comes into contact with at least one of the seal members when the uneven portion passes through the insertion opening of the case body. It is characterized by becoming.
According to this feature, when the uneven portion of the shaft member passes through the insertion opening of the case body, the at least one seal member comes into contact with the smooth surface while avoiding the uneven portion, and is in contact with the smooth surface. The sealing member in the casing can be maintained by the sealing member.

(A) is a side view which shows the introducing device of the working tool in Example 1, (b) is a top view similarly. It is a sectional side view which shows the state of the introduction initial stage of an introduction apparatus. (A) is AA sectional drawing of FIG. 2 which shows a holding member, (b) is a side view of (a) similarly. It is a sectional side view which shows before the delivery of the shaft member in a movement process. It is a sectional side view which shows after sending out of the shaft member in a movement process. It is a sectional side view which shows a movement control process and a connection process. It is a sectional side view which shows a regulation release process. (A) is a figure which shows the outer peripheral surface of the shaft member by which the grid process was carried out, (b) is a figure which shows the outer peripheral surface of the shaft member by which the labyrinth process was carried out, (c) is a shaft by which the knurling process was carried out. It is a figure which shows the outer peripheral surface of a member. It is a sectional side view which shows the state of the introduction initial stage of the introduction apparatus in Example 2.

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

  A fluid pipe cutting device according to Embodiment 1 will be described with reference to FIGS. 1 to 7. In a case 2 in which a fluid pipe 1 through which a fluid flows is hermetically enclosed, a work such as drilling or fluid control insertion at a predetermined position of the fluid pipe 1 is performed in an uninterrupted state by various kinds of working tools. There is. In the present embodiment, a method of introducing a cutter as a working tool for cutting a predetermined portion of the fluid pipe 1 to cut the fluid pipe 1 or form an opening in an uninterrupted state will be described.

  As shown in the lower part of FIG. 4, first, a two-divided housing 2 having an opening 2 a on the upper side is sealed at a predetermined position of the fluid pipe 1, and the opening 2 a of the housing 2 is sealed. In this case, an introduction device 5 for introducing a work tool into the housing 2 is installed through a work valve 4 capable of sealingly closing the opening 2a. In addition, the fluid in the fluid pipe may be, for example, gas or a gas-liquid mixture of gas and liquid in addition to water, industrial water, sewage, and the like. Furthermore, the housing has a two-divided structure in the present embodiment, but may have another multiple-divided structure, and the divided housings may be joined with bolts via welding or packing.

  The structure of the introduction device 5 will be described in detail with reference to FIGS. 1 and 2. The introduction device 5 includes a case member 3 that is a case body of the present invention that communicates with the housing 2 and a cylindrical member 6 that communicates with the case member 3. A shaft member 8 to which a cutter 7 as a blade member in the present invention for cutting the fluid pipe 1 in the housing 2 is connected, and an advance / retreat restricting mechanism 10 for restricting forward / backward movement or forward / backward movement of the shaft member 8. And is composed of. In addition, the cylindrical member 6 has the insertion port 6a in which the sealing member 20 was provided so that it may mention later.

  The case member 3 is attached in a sealed manner above the opening 2 a of the housing 2, and a flange 3 a is formed at the upper end of the case member 3. A cylindrical member 6 communicates with the flange 3a and is hermetically connected by bolts and nuts 27. The cylindrical member 6 includes a stopper member that can advance and retract from the outside of the cylindrical member 6 toward the inner diameter direction. 9,9 are provided. Further, an insertion port 6 a having a diameter smaller than that of the cylindrical member 6 is extended at the upper part of the cylindrical member 6. A mounting portion 6b projecting in the outer peripheral direction is provided on the peripheral surface of the insertion port 6a, and a support member 11 serving as a guide for the advance / retreat restriction mechanism 10 is fixedly installed on the mounting portion 6b.

  The support member 11 includes a substrate 11a whose one end is fixed to the mounting portion 6b, columns 11b and 11b which are vertically erected from the substrate 11a, and a beam plate 11c which is installed on the other end of the columns 11b and 11b. The four support shafts 11d are inserted through the substrate 11a and the beam plate 11c. Each column 11b, 11b is spaced apart from one side of the side surface of the substrate 11a, and one side end of each column 11b, 11b is fixed on the side surface. In addition, a beam plate 11c is fixed to the other side end of the columns 11b and 11b. The substrate 11a and the beam plate 11c are provided with a shaft member 8 at the center thereof, and support shafts 11d are provided so as to surround the shaft member 8. The support member 11 configured in this manner is set to be shorter than the axial length of the shaft member 8.

  As a result, the shaft member 8 is guided by the support member 11 to move forward and backward, so that the shaft member 8 can move forward and backward stably. That is, it is possible to prevent the shaft member 8 from being displaced or tilted in the forward / backward movement of the shaft member 8. Furthermore, since the support member 11 is set to be shorter than the length of the shaft member 8 in the axial direction, the length of the introduction device 5 extending outward of the housing 2 can be suppressed within the range of the shaft member 8. . In addition, not only the support member 11 of the present embodiment but also, for example, an integral cylindrical member having a space in which the shaft member can be inserted may be used, which is rigid and further has an axial length of the shaft member. What is necessary is just to be set shorter.

  In this embodiment, annular seal members 20 and 20 having elasticity such as rubber are spaced apart in the extending direction of the insertion port 6a, that is, the axial direction of the shaft member 8 on the inner peripheral surface of the insertion port 6a. The two seal members 20, 20 are in contact with the outer peripheral surface of the shaft member 8, so that the inside of the case member 3 and the cylindrical member 6 is sealed. By providing the seal members 20, 20 apart from each other in the axial direction, not only can the shaft member 8 be prevented from tilting but also guided in the insertion direction, the sealing performance can be improved. The number of seal members is not limited to two, and a plurality of seal members may be provided at three or more locations, or only one location may be provided.

  The shaft member 8 will be described. A joint shaft 18 which is a separate shaft member to be described later can be attached to and detached from the shaft member 8, and the axial length can be extended or shortened. Further, the cutter 7 is connected to the front end of the shaft member 8 by a bolt / nut 21, and a recess 8 a that opens in the rear end direction is provided at the rear end of the shaft member 8. More specifically, the cutter 7 includes a cylindrical member provided with a perforating blade 7a at the peripheral end, and a center drill 7b that is disposed coaxially with the cylindrical member and protrudes further forward than the perforating blade 7a. Further, on the peripheral surface of the shaft member 8 on the cutter 7 side, an annular locking portion 8b protruding outward is formed.

  Further, on the outer peripheral surface of the shaft member 8, minute uneven portions 30 are formed over the entire circumferential direction and the axial direction of the shaft member 8. As shown in FIG. 8 (a), the concavo-convex portion 30 is a lattice pattern having a geometric pattern in which concave portions 30a having a substantially square shape and ridges 30b extending in the circumferential direction and the axial direction are combined. It has become. In addition, it is preferable that the pitch of the uneven | corrugated | grooved part 30 which is the separation width of the recessed parts 30a is about 1-2 mm, and it is preferable that the depth dimension D of this uneven | corrugated | grooved part 30 is 10-500 micrometers. . In the present embodiment, the depth dimension D of the concavo-convex part 30 is 10 to 500 μm. However, in particular, when the depth dimension D of the concavo-convex part 30 is in the range of 10 to 100 μm, the sealing performance is enhanced. Furthermore, the same uneven | corrugated | grooved part 30 'is formed in the outer peripheral surface of the joint shaft 18 over the whole surface of the circumferential direction and an axial direction.

  Next, the advance / retreat restriction mechanism 10 will be described. As shown in FIGS. 1 to 3, the advance / retreat restriction mechanism 10 mainly includes a gripping member 12 that can grip or release the shaft member 8, and a gripping member 12. The member 8 includes an advancing / retracting member 13 that moves forward and backward within a range in the axial direction of the member 8 and a restricting member 14 that can restrict or release the movement of the shaft member 8.

  More specifically, as shown in FIG. 1B, the advance / retreat member 13 has a substantially rectangular shape in plan view, and the support shaft 11d of the support member 11 fixedly installed on the attachment portion 6b is inserted vertically. Has been. Therefore, the advance / retreat member 13 is configured to move along the support shaft 11d. Further, as shown in FIG. 1A, an advance / retreat cylinder 15 that is connected to a shaft 28 and advances / retreats the advance / retreat member 13 is disposed above the advance / retreat member 13. A holding member 12 is fixed below the advance / retreat member 13 by a support bolt 12g and a connecting bolt 12h. As a result, the advancing / retreating member 13 moves with the gripping member 12. In this embodiment, the support member 11, the advance / retreat member 13, the advance / retreat cylinder 15 and the shaft 28 constitute an advance / retreat driving means. Further, the advance / retreat cylinder 15 can move the advance / retreat member 13 along the axial direction of the shaft member 8 with a predetermined drive stroke, as will be described later.

  Further, the regulating member 14 is fixed to the substrate 11a of the support member 11 so as to be immovable by a support bolt and a connecting bolt so as to be close to the insertion port 6a. That is, the regulating member 14 is provided in the vicinity of the seal members 20 and 20. Thus, even if a force for tilting the shaft member 8 is applied due to the restriction of the restriction member 14, not only can the influence on the sealing performance of the seal members 20, 20 be minimized, but also the case body rather than the restriction member 14. By arranging the gripping member 12 and the advancing / retreating member 13 at the outer location, a large movement range in the axial direction can be taken.

  Next, the holding member 12 and the regulating member 14 will be described. In the present embodiment, the gripping member 12 and the regulating member 14 have the same structure, and only the gripping member 12 will be described regarding the structure of the gripping member 12 and the regulating member 14.

  As shown in FIG. 3A, the gripping member 12 is composed of four pinching pieces 12a, 12b, 12a ′, 12b ′ having an inner peripheral portion along the outer peripheral surface of the shaft member 8, The axial pressure of the shaft member 8 is narrowed from the outer diameter direction toward the inner diameter direction. Since the respective clamping pieces 12a, 12b, 12a ′, 12b ′ pinch the shaft member 8 in the inner diameter direction, the displacement forces acting in the inner diameter direction are canceled each other, so that the axial center position of the shaft member 8 is maintained. In addition, the shaft member 8 can be securely gripped. Thereby, it can prevent that the axial center of the shaft member 8 displaces and the sealing performance of the sealing members 20 and 20 falls.

  The end portion 12c in the circumferential direction of the narrow pressure piece 12a and the end portion 12d of the narrow pressure piece 12b have an uneven shape, and the uneven shape is alternately fitted. A bolt hole 12k is drilled in the same direction as the shaft member 8 at a fitting portion between the end 12c and the end 12d, and the support bolt 12g serving as a support shaft is inserted into the bolt hole 12k to be narrowed. The pressure piece 12a and the narrow pressure piece 12b are pivotally supported with respect to each other. That is, the narrow pressure pieces 12a and 12b are hinges 12j connected in a substantially hinge shape that can be rotated around a support bolt 12g inserted into the bolt hole 12k. The narrow pressure pieces 12a 'and 12b' are also hinges 12j 'by the same configuration.

  Pin holes 16, 16 are bored in the same direction as the shaft member 8 at both ends of the hinge 12 j around the support bolt 12 g. Similarly, the hinge 12j 'is also provided with pin holes 16' and 16 'at both ends around the spindle bolt 12g'. A pivot pin 17 and a pivot pin 17 'are rotatably arranged in the pin hole 16 and the pin hole 16'.

  Between the hinge 12j and the hinge 12j ', grip cylinders 23 and 23' are installed at two locations. The gripping cylinder 23 has a piston 23a that expands and contracts toward the pivot pins 17 and 17 'on the upper side of FIG. 3 (a). The gripping cylinder 23' is lower in the drawing of FIG. 3 (a). It has a piston 23a 'that expands and contracts toward the side pivot pins 17, 17'. The pistons 23a and 23a 'are connected to the respective pivot pins 17 and 17' located in the extending and contracting direction.

  Thus, the pressing pieces 12a, 12b, 12a ′, 12b ′ are in a state of being connected in an approximately annular shape so as to surround the shaft member 8 in the circumferential direction, and an annular space in the center in plan view. Is formed. The annular space has a slightly larger diameter than the outer periphery of the shaft member 8 in a natural state, and a shaft member is disposed on the inner peripheral portion of each of the pressing pieces 12a, 12b, 12a ′, 12b ′ located in the annular space. A protrusion 12e protruding toward the surface 8 is formed. The protrusion 12e is substantially U-shaped in a cross-sectional view so as to cover the protrusion 12e, and the contact as a contact portion in the present invention is formed of a mold-based friction material. A member 22 is provided (see a partially enlarged view of FIG. 4). In the present embodiment, it is preferable to use Ultrastop (registered trademark) manufactured by NICHIAS Corporation for the contact member 22 as a mold friction material.

  In the present embodiment, the plurality of contact members 22 are arranged at equal intervals over the entire protrusion 12e extending in the circumferential direction. By doing in this way, the usage-amount of a mold type friction material can be reduced, maintaining the holding | grip force which the holding member 12 hold | grips the shaft member 8. FIG. In addition, you may make it provide the contact member 22 extended integrally in the circumferential direction for every protrusion 12e of each pinching piece 12a, 12b, 12a ', 12b'.

  Furthermore, in this embodiment, as shown in the partially enlarged view of FIG. 4, protrusions 12e and 12e are formed at two upper and lower portions of the inner peripheral portion of each pressing piece 12a, 12b, 12a ′, 12b ′. Contact members 22, 22 are provided on the upper and lower protrusions 12e, 12e. The protrusions 12e provided with the contact members 22 may be provided in a plurality of rows in the axial direction, or the protrusions 12e are formed so as to extend in the axial direction, and the protrusions 12e extending in the axial direction are formed in the circumferential direction. A plurality of rows may be provided. In addition, without forming the protrusion 12e in each pinching piece 12a, 12b, 12a ', 12b', the contact member 22 is made over the whole inner peripheral surface of each pinching piece 12a, 12b, 12a ', 12b'. You may make it provide.

  In addition, the mold friction material constituting the contact member 22 is a resin-based non-asbestos hard friction material which is mainly heat-molded with aramid fiber as a main material and a special thermosetting synthetic resin and a filler. It has a high coefficient of friction and low wear. The non-asbestos friction material is composed of a material other than asbestos (organic fiber, inorganic fiber, etc.) as a main constituent material, plus a binder (synthetic resin, rubber, etc.) and a filler. Further, non-asbestos friction materials include woven friction materials in addition to mold friction materials, and mold friction materials include semi-metallic friction materials, which may be used depending on the application.

More specifically, the mold type friction material has a friction coefficient in the range of 0.25 to 0.54 and a wear rate of 0.05 to 0.39 (× 10 ⁻⁷ cm ² / N) at a temperature of 100 to 250 ° C. It is preferable to use those within the range of m) (test method according to JIS D 4411, pressing pressure: 1 MPa, sliding speed: 7 m / s). Moreover, it is preferable to use a mold type friction material having a specific gravity in the range of 1.7 to 1.8. Further, it is preferable to use a mold friction material having a compressive strength in the range of 5000 to 18000 (N / cm ² ) (strength when 20 mm × 20 mm × 6 ^t mm is applied). Further, it is preferable to use a mold friction material having a bending strength in the range of 18 to 56 (N / mm ² ) (test method according to JIS D 4311). Further, it is preferable to use a mold type friction material having a Brinell hardness within a range of 15 to 39 HB (10/500/30) (according to a JIS Z 2243 Brinell hardness test method).

In addition, the mold type friction material of a present Example is a temperature of 100-250 degreeC, a friction coefficient is in the range of 0.44-0.51, and a wear rate is 0.07-0.25 (* 10 < ^-7 > cm < ² >). / N · m), specific gravity is 1.8, compression strength is 8000 (N / cm ² ), bending strength is 45 (N / mm ² ), and Brinell hardness is 25 HB (10/500/30). ) Is used.

  Further, the connecting bolt 12h described above is formed in each of the pinching pieces 12a, 12b, 12a ′, 12b ′, and is inserted into a long hole 24 having a length in the substantially radial direction of the shaft member 8 and fixed to the advance / retreat member 13. ing. Accordingly, the pinching pieces 12a, 12b, 12a ', 12b' are arranged to be allowed to move in the substantially radial direction of the shaft member 8 by the length of the long hole 24 with respect to the shaft member 8, respectively. Such pivot pins 17 and 17 'and the connecting bolt 12h are provided with a retaining member 25 for locking against the detachment movement of the pivot pins 17 and 17' and the connecting bolt 12h. , 12a ′ and 12b ′.

  An operation in which the grip member 12 grips or releases the grip on the shaft member 8 will be described. Pistons 23a and 23a 'are driven by connecting hydraulic hoses (not shown) to the gripping cylinders 23 and 23'. The gripping operation of the gripping member 12 is such that when the pistons 23a and 23a ′ are contracted, the hinges 12j and the hinges 12j ′ rotate so as to close toward the shaft member 8, and the pinching pieces 12a, 12b, and 12a. ', 12b' makes the shaft member 8 gripped by narrowing the shaft member 8 in the radial direction. Further, the grip releasing operation of the grip member 12 is brought into a grip release state by rotating the hinges 12j and 12j 'apart from the shaft member 8 by extending the pistons 23a and 23a'. Is. The operations of these pistons 23a and 23a 'are interlocked.

  The forward / backward restricting mechanism 10 configured as described above further includes a rotation motor 19 as rotation driving means in the present invention that imparts rotation to the gripping member 12 that is gripping the shaft member 8. Specifically, a rotation motor 19 is fixed to a part of the advancing / retreating member 13, and rotation is applied to the gripping member 12 in a state in which the shaft member 8 is gripped by the rotation motor 19. The cutter 7 can be applied as a work tool by transmitting the rotation and rotating the shaft member 8.

  Next, a method for cutting the fluid pipe 1 in an uninterrupted state by the introduction device 5 configured as described above will be described.

  As shown in FIG. 2, in the initial state in which the introduction device 5 is installed in the opening 2 a of the housing 2, the stopper members 9 and 9 of the cylindrical member 6 are moving toward the shaft member 8, and the stopper A state in which the locking portion 8b of the shaft member 8 is placed on the members 9, 9 is locked. In this state, the shaft member 8 is prevented from falling into the housing 2 due to its own weight or the weight of the cutter 7, and the cutter 7 is housed in the case body. The stopper member and the locking portion are not limited to those provided on the cylindrical member, and may be provided outward from the insertion port. It may be gripped.

  First, the movement process of the present invention in which the shaft member 8 is sent out into the housing 2 by the advance / retreat restriction mechanism 10 to restrict the advance / retreat movement of the shaft member 8 will be described.

  As shown in FIG. 4, in the initial state of the introduction device 5, a hydraulic hose (not shown) is connected to the gripping member 12, and the gripping member 12 is held in the shaft member 8 by the gripping operation to the shaft member 8 described above. Grip to the outer peripheral surface on the rear end side. At this time, the contact member 22 of the gripping member 12 is made of a mold-type friction material having a high friction coefficient and low wear, so that the outer peripheral surface of the shaft member 8 and the contact member 22 of the gripping member 12 A high frictional force can be applied between them. Further, the contact member 22 bites into the concave portion 30a of the concave-convex portion 30 formed on the outer peripheral surface of the shaft member 8, so that the frictional force is increased. In this way, the hydraulic hose is removed from the gripping member 12 while maintaining the gripping state of the gripping member 12 on the shaft member 8. Further, the stopper members 9, 9 are retracted toward the outside of the cylindrical member 6, and the movement restriction of the shaft member 8 is released. As a result, the shaft member 8 and the cutter 7 are brought into a state where the movement of the shaft member 8 and the cutter 7 is restricted by the gripping member 12 while the movement restriction of the stopper members 9 and 9 is released.

  Next, as shown in FIG. 5, the rotary motor 19 is activated. The gripping member 12 is rotated by the rotary motor 19 while the gripping state of the shaft member 8 is held by the gripping member 12, whereby the shaft member 8 and the cutter 7 are rotated. Further, the advancing / retreating member 13 and the gripping member 12 are advanced by the advancing / retreating cylinders 15 and 15 in a state where the shaft member 8 and the cutter 7 are rotated, so that the housing 2 is kept in a state where the shaft member 8 and the cutter 7 are rotated. The center drill 7b of the cutter 7 first pierces the tube wall of the fluid tube 1. The movement of the shaft member 8 and the cutter 7, that is, the driving stroke is performed in a range from the gripping position of the gripping member 12 to the position close to the regulating member 14, and the shaft member 8 includes the sealing members 20, 20. And move forward. The state where the movement of the shaft member 8 and the cutter 7 after completion of the advancing movement is restricted by the gripping member 12 is continued.

  Next, after the shaft member 8 and the cutter 7 are moved forward, the rotation of the shaft member 8 by the rotary motor 19 is stopped. And the process which connects the joint shaft 18 mentioned above to the shaft member 8 which is a connection process of this invention is performed.

  When this connection process is described, as shown in FIG. 6, the joint shaft 18 has the same diameter as that of the shaft member 8 excluding the locking portion 8 b and has the same axial length as that of the shaft member 8. In addition, a convex portion 18a that can be fitted into the concave portion 8a of the shaft member 8 is provided at the front end, and a concave portion 8a ′ similar to the concave portion 8a of the shaft member 8 is provided at the rear end. Further, a through-hole 18b penetrating in the radial direction is formed in the convex portion 18a of the joint shaft 18, and holes 8c and 8c corresponding to the through-hole 18b are formed in the concave portion 8a of the shaft member 8. Has been.

  First, the convex portion 18a of the joint shaft 18 is fitted into the concave portion 8a of the shaft member 8, and alignment is performed so that the through hole 18b and the hole portions 8c and 8c communicate with each other. Thereafter, a connecting member 26 for connecting the shaft member 8 and the joint shaft 18 is inserted into the through hole 18b and the holes 8c, 8c, and the connecting member 26 is connected to the shaft member 8 and the joint shaft 18 by pinning 26a, 26a. Fix across. The connecting member 26 and the pin stoppers 26 a and 26 a are substantially flush with each other without protruding outward from the outer peripheral surface of the shaft member 8. That is, in the connecting step, the shaft member 8 and the joint shaft 18 are connected to each other by the connecting member 26 and the pinning 26a, 26a formed substantially flush with the outer surfaces of the shaft member 8 and the joint shaft 18. Since the connecting member 26 does not protrude outward from the shaft member 8, even if the connecting member 26 passes through the seal members 20 and 20, the sealing performance is not hindered. In the same manner as described above, a plurality of joint shafts are sequentially connected by fitting a convex portion of another joint shaft having the same structure as the joint shaft 18 into the recess 8a ′ at the rear end of the joint shaft 18. Can be done.

  After this connection process is completed, a movement restriction process is performed. The movement restricting step is a step of holding the shaft member 8 at a narrow pressure by the restricting member 14, and the shaft member 8 and the joint shaft 18 are made unmovable by performing this movement restricting step. Then, the grip member 12 is released from the shaft member 8 by performing the above-described grip release operation of the grip member 12 while the shaft member 8 is held narrowly by the regulating member 14. In the present embodiment, the movement restricting step is performed after the completion of the connecting step. However, the connecting step may be performed after the movement restricting step is completed. In order to hold the pinching force 8, any step may be performed first.

  Next, as shown in FIG. 7, when the shaft member 8 and the joint shaft 18 are incapable of moving, the advance / retreat member 13 and the gripping member 12 are moved backward to above the support member 11 by the advance / retreat cylinders 15, 15. In this state, the holding member 12 is released from the holding state of the shaft member 8, so that the shaft member 8 and the joint shaft 18 held narrowly by the restricting member 14 maintain the positions after the moving process, and the advancing / retreating member. Only 13 and the gripping member 12 can be moved backward above the support member 11.

  After only the advancing / retracting member 13 and the gripping member 12 are moved backward to above the support member 11, the gripping member 12 is again gripped on the outer peripheral surface on the rear end side of the shaft member 8 by the above-described operation. At this time, since the movement of the shaft member 8 and the joint shaft 18 is restricted by the restriction member 14, the restriction member 14, which is a restriction release process, is released from the shaft member 8. Thus, the shaft member 8 and the joint shaft 18 can be moved forward and backward again by the advance / retreat member 13 and the gripping member 12.

  After the regulation release step, although not particularly shown, the fluid pipe 1 is cut by the cutter 7 by performing the above-described moving step again. These steps are performed outside the case body, and thus there is no concern of affecting the case body and the housing 2. Furthermore, after the cutting is completed, the shaft member 8 can be retracted from the housing 2 by moving the shaft member 8 backward in the moving step and sequentially removing in the connecting step. That is, since the shaft member 8 is detachably connected to the joint shaft 18, the length of the shaft member 8 extending outward from the case body can be shortened. In addition, the axial direction toward the housing | casing 2 of the shaft member 8 and the predetermined number of joint shafts 18 is performed by performing the process steps of the movement process, the connection process, the movement restriction process, and the restriction release process described above a plurality of times. Can be extended in sequence.

  Further, when the shaft member 8 is pulled back until it returns to the initial state, the casing 2 is sealed by the work valve 4 and the introduction of the introduction device 5 completes the disconnection of the fluid pipe 1 in the unsteady flow state.

  As described above, in the fluid pipe cutting device according to the first embodiment, the shaft member 8 can be moved back and forth together with the gripping member 12 by the advance / retreat cylinder 15, and the shaft member 8 is once gripped by the gripping member 12. Thus, the shaft member 8 is advanced in the axial direction with a predetermined drive stroke, and after the advancement, the grip is released, only the grip member 12 is retracted, the shaft member 8 is gripped again, and the shaft member 8 is advanced again. By repeating this driving stroke, the length of the driving stroke of the advance / retreat cylinder 15 can be made shorter than the moving stroke in which the shaft member 8 and the joint shaft 18 move, and the advance / retreat cylinder 15 has a longer shaft member 8. 18 can be made smaller and lighter as a result, and the entire apparatus can be made smaller and lighter.

  In addition, since the contact member 22 of the grip member 12 is made of a mold friction material, a high friction force can be applied between the outer peripheral surface of the shaft member 8 and the contact member 22 of the grip member 12, As a result, a sufficient gripping force can be obtained even if the driving force of the gripping cylinders 23, 23 ′ is reduced, and the members such as the pistons 23a, 23a ′ driven by the hydraulic pressure in the gripping cylinders 23, 23 ′ can be reduced in size. And weight reduction.

  Since the rotary motor 18 and the advance / retreat cylinder 15 that drive the shaft member 8 are installed outside the housing 2 and the case body, the influence of fluid such as water in the sealed housing 2 and the case body. The failure rate can be reduced without receiving the rotation motor 18 and the advance / retreat cylinder 15.

  The frictional force of the mold-type friction material is reduced when it gets wet with water or the like. However, since the gripping member 12 and the like are installed outside the casing 2 and the case body, they are sealed. The frictional force can be maintained without the contact member 22 made of a mold friction material being affected by the fluid such as water in the casing 2 and the case body.

  In addition, since the shaft member 8 is driven by the frictional force, the structure of the shaft member 8 and the gripping member 12 is simplified, and even if the load is unexpectedly applied to the cutter 7 while the fluid pipe 1 is being cut, the contact is a friction material. Since the shaft member 8 is slid by the member 22, there is no influence on other devices such as the rotary motor 18 and the advance / retreat cylinder 15, and failure of these devices can be prevented.

  Moreover, the uneven part 30 of the outer peripheral surface of the shaft member 8 is formed of a mold-type friction material by forming the uneven part 30 for improving the frictional force with the contact member 22 on the entire outer peripheral surface of the shaft member 8. Thus, the frictional force between the contact member 22 of the gripping member 12 and the outer peripheral surface of the shaft member 8 can be increased.

  The uneven portion 30 having a depth D of 10 to 500 μm increases the frictional force between the contact member 22 of the gripping member 12 and the outer peripheral surface of the shaft member 8, while the uneven portion 30 is the insertion port 6 a of the tubular member 6. When passing through the housing 2, the sealing member 20 has an optimum dimension capable of maintaining the sealing property within the housing 2 and the case body without affecting the sealing property of the sealing member 20.

  Further, the concave and convex portion 30 has a lattice shape which is a geometric pattern in which concave portions 30a having a substantially square shape and convex ridges 30b extending in the circumferential direction and the axial direction are combined. Since the frictional force between the outer peripheral surface of the member 8 and the contact member 22 made of the mold friction material can be increased, and the uneven portion 30 is formed uniformly over the entire circumference of the shaft member 8, the shaft The uneven portion 30 of the member 8 and the surface of the seal member 20 have uniform adhesion over the entire circumference of the shaft member 8, and the sealing performance by the seal member 20 can be improved.

  Note that, in the lattice-shaped concavo-convex portion 30, the ridges 30 b extending in the circumferential direction of the shaft member 8 are extended over the entire circumference of the shaft member 8, and the concavo-convex portion 30 is inserted into the cylindrical member 6. When the seal member 20 and the protrusion 30b come into contact with each other when passing through the opening 6a, the sealing performance by the seal member 20 can be maintained over the entire circumference of the shaft member 8.

  Furthermore, in the present embodiment, the lattice-shaped uneven portion 30 is formed on the outer peripheral surface of the shaft member 8, but the uneven portion 30 may be formed as a geometric pattern other than the lattice shape. As a modification of the geometric pattern, for example, as shown in FIG. 8 (b), a lateral groove in which a groove 31a extending in the circumferential direction of the shaft member 8 and a protrusion 31b extending in the circumferential direction are combined. The uneven portion 31 may be formed by performing a labyrinth process. As another modification of the geometric pattern, as shown in FIG. 8 (c), the concavo-convex portion 32 may be formed by performing a knurling process having convex portions 32b formed by a plurality of quadrangular pyramids. . In addition, although the tip of the convex part 32b formed with the quadrangular pyramid is tapered, if the knurling process, the tip of the convex part may not be sharp, for example, the convex part is a prism or a cylinder. Alternatively, it may be a truncated cone or a truncated pyramid having convex portions formed in a truncated pit body, and the tip surface may be a rhombus, a quadrangle, a parallelogram, or a circle.

  Next, a fluid pipe cutting device according to a second embodiment will be described with reference to FIG. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted.

  As shown in FIG. 9, in the shaft member 8 ′ in Example 2, the uneven portion 33 is formed in a predetermined region of the outer peripheral surface of the portion corresponding to the grip member 12 in the axial direction, and the other regions are A smooth surface 34 is formed. Further, similar uneven portions 33 ′ and smooth surfaces 34 ′ are formed on the outer peripheral surface of the joint shaft 18.

  In addition, the concavo-convex portion 33 vertical width L1 of the shaft member 8 ′ is larger than the vertical separation width L2 of the contact members 22 and 22 in which the protrusions 12e and 12e are formed at the two upper and lower portions of the gripping member 12, and The upper and lower seal members 20, 20 provided on the inner peripheral surface of the insertion port 6 a of the cylindrical member 6 are formed to be smaller than the upper and lower separation width L 3.

  In this way, when the shaft member 8 ′ is gripped by the gripping member 12, the upper and lower contact members 22, 22 come into contact with the uneven portion 33. Further, when the concave and convex portion 33 of the shaft member 8 passes through the insertion port 6a of the cylindrical member 6, the concave and convex portion 33 comes into contact with one of the upper and lower seal members 20 and 20, and the sealing performance is increased. However, the other sealing member 20 comes into contact with the smooth surface 34 while avoiding the concavo-convex portion 33, and the sealing performance within the housing is maintained by the sealing member 20 that is in contact with the smooth surface 34. be able to.

  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 the above embodiment, the shaft member 8 and the joint shaft 18 are coupled in the coupling step to form a long shaft member, but the shaft member 8 and the joint shaft 18 are one shaft member. Even such a long shaft member can be handled by repeating the drive stroke by the advance / retreat drive means, and the advance / retreat drive means can be reduced in size and weight.

  In the above embodiment, the gripping member and the restricting member have the same structure, and the gripping member can be moved forward and backward, and the restricting member cannot be moved forward and backward. The structure may be different from the member, and the restricting member may be capable of moving forward and backward. Alternatively, the gripping member and the regulating member may be unable to move forward and backward, and can be applied to various modes. In addition, the contact member comprised with the mold type friction material should just be provided in the holding member at least, and the contact member provided in a control member is the metal which has other friction materials, such as other wet and dry types, and a high friction coefficient. You may be comprised with materials, such as a board, an elastomer, and rubber | gum.

1 Fluid Pipe 2 Housing 3 Case Member (Case Body)
5 Introducing device 6 Cylindrical member (case body)
6a Insertion slot 7 Cutter (blade member)
8,8 'shaft member 10 advance / retreat restriction mechanism 11 support member (advance / retreat drive means)
12 gripping member 13 advance / retreat member (advance / retreat drive means)
15 Reciprocating cylinder (Advancing / retreating drive means)
18, 18 'joint shaft (shaft member)
19 Rotating motor (Rotating drive means)
20 Seal member 22 Contact member (molded friction material)
28 axes (advance / retreat drive)
30, 30 'Concave portion 30a Concave portion 30b Convex portion 31 Concave portion 31a Convex portion 31b Convex portion 32b Convex portion 33, 33' Concavity portion 34, 34 'Smooth surface

Claims (5)

A rotation driving means for sealingly attaching the casing to the fluid pipe, providing a case body communicating with the opening of the casing in a sealing manner, and rotating a shaft member having a blade member connected to the tip in the circumferential direction; Advancing / retreating drive means for moving the shaft member in the axial direction is installed outside the casing and the case body, and the blade member is driven by driving the shaft member by the rotation driving means and the advance / retreat driving means. A fluid pipe cutting device for cutting the fluid pipe,
A gripping member that grips or releases the shaft member is provided, and the rotational driving means applies a rotational driving force to the gripping member, and the advance / retreat driving means advances and retracts the gripping member in the axial direction of the shaft member. By doing so, the shaft member gripped by the gripping member is rotated or advanced and retracted, and the contact portion of the gripping member that comes into contact with the outer peripheral surface of the shaft member is made of a mold friction material. A fluid pipe cutting device.   The fluid pipe cutting device according to claim 1, wherein an uneven portion that improves a frictional force with the contact portion is formed on an outer peripheral surface of a portion corresponding to the gripping member in an axial direction of the shaft member. . The shaft member is inserted from the insertion port of the case body, and a seal member is provided for sealing between the inner peripheral surface of the insertion port and the outer peripheral surface of the shaft member, and the case body and the shaft member And the fluid pipe is cut in an uninterrupted state.
The fluid pipe cutting device according to claim 2, wherein a depth dimension of the uneven portion is 10 to 500 μm.   The fluid pipe cutting device according to claim 2, wherein the concavo-convex portion is formed by arranging concavo-convex portions having a predetermined shape as a geometric pattern. The shaft member is inserted from the insertion port of the case body, and a seal member is provided for sealing between the inner peripheral surface of the insertion port and the outer peripheral surface of the shaft member, and the case body and the shaft member And the fluid pipe is cut in an uninterrupted state.
The case body includes at least two seal members that are spaced apart in the axial direction of the shaft member, and the uneven portion is an outer peripheral surface of a portion corresponding to the gripping member in the axial direction of the shaft member And a smooth smooth surface is formed at other portions, and the smooth surface comes into contact with at least one of the seal members when the uneven portion passes through the insertion opening of the case body. The fluid pipe cutting device according to any one of claims 2 to 4, wherein the fluid pipe cutting device is formed.

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