JP2640447B2 - Resin pipe bending equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin pipe bending apparatus which is suitably used to bend (bend) a resin pipe used as a gas pipe, a water pipe or the like at an intermediate position.

[0002]

2. Description of the Related Art Generally, a bending device for a resin pipe used for a gas pipe or the like includes a beam member extending in a length direction of the resin pipe, and a beam member attached to one end of the beam member in a length direction thereof. And a plurality of clamps which are attached to the beam member at positions away from the clamps, and are formed in a ring shape so as to surround the resin tube from the outer peripheral surface thereof. The ring comprises a ring member through which the resin pipe is inserted, and a hydraulic cylinder attached to the ring member and bending the resin pipe by expanding and contracting a rod toward the outer peripheral surface of the resin pipe.

[0003] In this type of prior art resin pipe bending apparatus, the resin pipe is first inserted into a ring member, and then the resin pipe is clamped at one end of the beam member by clamps. By extending the rod of the hydraulic cylinder toward the outer peripheral surface of the resin pipe at a position away from the cylinder, a bending force is applied to the portion of the resin pipe located within the ring member, and the resin pipe is supported at the position of the clamp. Thus, the ring member is bent (bent) in the radial direction.

Here, such a conventional apparatus for bending a resin pipe is used in a work site as shown in FIG. 5, for example.

In the drawing, reference numeral 1 denotes a ground portion of a work site, 2 denotes a pipe groove which is excavated in the ground portion 1 and extends in the longitudinal direction, and the pipe groove 2 has a substantially U-shaped cross section in the ground portion 1. Formed as
A resin tube 4 to be described later is provided in the inside along the longitudinal direction. Reference numeral 3 denotes a manhole provided at an intermediate position of the pipe groove 2, and the manhole 3 has one end buried in the ground downward from the bottom of the pipe groove 2 and the other end opened toward the ground. I have.

Reference numeral 4 denotes a resin pipe used for a gas pipe or the like. The resin pipe 4 has straight pipe sections 4A and 4B extending longitudinally along a central portion in the pipe groove 2, and each of the straight pipes. Parts 4A, 4B
And a curved pipe portion 4C disposed in the piping groove 2 so as to avoid the manhole 3. The end of the straight pipe portion 4B of the resin pipe 4 is connected to another resin pipe 5 via a joint (neither is shown) or the like.

In such a conventional bending apparatus for a resin pipe 4, when the resin pipe 4 is disposed in the pipe groove 2, the manhole 3 serves as a hindrance member. By forming the curved tube portion 4C in the groove and arranging the curved tube portion 4C between the manhole 3 and the side surface of the piping groove 2, the entire resin pipe 4 can be embedded in the piping groove 2 avoiding the manhole 3. Like that.

[0008]

In the apparatus for bending a resin pipe according to the prior art described above, the bending force is applied to the resin pipe by extending the rod of the hydraulic cylinder with the resin pipe inserted through the ring member. When the bending device is mounted on the resin tube 4 shown in FIG. 5, the resin tube 4 is first inserted into the ring member from the front end side of the straight pipe portion 4B, and then the entire bending device is mounted. Resin tube 4
It is necessary to carry it along to the curved tube portion 4C so as to carry it.

After bending the resin pipe 4 curved tube portion 4C with the bending device, the entire bending device is moved again to the tip of the straight tube portion 4B, and then moved. It is necessary to remove the ring member by pulling it out from the front end side of the straight pipe portion 4B.

For this reason, in the prior art, when the entire bending apparatus is mounted (removed) on the resin pipe 4, the operation of moving the entire bending apparatus to the distal end side of the resin pipe and moving the bending apparatus becomes troublesome. In addition to lowering the efficiency, when the ring member of the bending device is removed from the resin tube 4, since the curved tube portion 4C is already formed in the resin tube 4, the inner peripheral surface of the ring member and the rod of the hydraulic cylinder are In many cases, the tip or the like is caught on the outer peripheral surface of the curved tube portion 4C, and the entire bending device cannot be pulled out smoothly from the distal end side of the resin tube 4, and the work of removing the bending device requires extra labor. There is.

Further, in the bending device according to the prior art, since the support portion for the resin pipe is fixed to the tip end of the rod of the hydraulic cylinder, when the bending angle of the resin tube gradually increases with the extension of the rod, the support portion of the support portion becomes smaller. The contact (contact) area between the contact surface and the outer peripheral surface of the resin pipe gradually becomes smaller, and the pressing force from the bearing cannot be efficiently transmitted to the resin pipe, and the resin pipe cannot be bent effectively. There is.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can easily perform the work of attaching and detaching to and from a resin pipe, and can greatly improve the workability during bending. It is another object of the present invention to provide a resin pipe bending apparatus capable of efficiently transmitting a bending force to a resin pipe.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a frame body formed to have a fixed length so as to extend in the longitudinal direction of a resin tube, and a frame body provided at one end of the frame body. A fixed arm having a fixed end protruding toward the outer peripheral surface of the resin tube at a fixed length, and the resin tube attached to the distal end of the fixed arm and abutting the outer peripheral surface of the resin tube widely. A fixed-side support portion having a contact portion extending in the circumferential direction, and a movable portion provided on the other end side of the frame body apart from the fixed arm and extending and contracting a rod toward the outer peripheral surface of the resin tube. An arm and a movable-side support portion, which is swingably provided on a rod tip side of the movable arm and has a contact portion extending in the circumferential direction of the resin tube so as to abut on the outer peripheral surface of the resin tube widely. And located between the fixed arm and the movable arm A substantially U-shaped handle provided at a middle portion in the longitudinal direction of the frame, and wound between the frame and the resin tube via the handle to support the fixed side and the movable side; And a detachable holding band for holding the resin tube between the first and second portions.

[0014]

According to the above construction, the movable-side support portion having the contact portion extending in the circumferential direction of the resin tube so as to contact the outer peripheral surface of the resin tube widely can be swung to the rod tip side of the movable arm. Therefore, even when the degree of bending of the resin tube increases with the elongation of the rod, the support portion swings with respect to the rod of the movable arm so that the contact portion of the support portion can be moved. A wide and reliable contact can be made with the outer peripheral surface of the resin pipe, and the pressing force from the bearing can be efficiently transmitted to the resin pipe.

[0015] Further, since the substantially U-shaped handle portion is provided between the fixed arm and the movable arm and provided at an intermediate portion in the longitudinal direction of the frame body, it is possible to carry the frame body through the handle portion. When the resin pipe bending apparatus is mounted on the resin pipe, the frame body can be easily moved to an appropriate mounting position.

Further, the detachable holding band is wound between the frame body and the resin tube through the handle portion, so that the resin tube is connected between the fixed-side support portion and the movable-portion support portion. Can be detachably held (clamped) with respect to the frame body, and by attaching and detaching the holding band, the bending device for the resin pipe can be easily attached to and detached from the resin pipe.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 11 denotes a resin pipe formed in the same manner as the resin pipe 4 described in the prior art, and the resin pipe 11 has, as described in the prior art, for example, an on-site piping groove as shown in FIG. 2.

Numeral 12 designates a rectangular tubular frame constituting a main body of the bending apparatus. The frame 12 has an upper plate extending at a constant length in the longitudinal direction as shown in FIGS. 12A, lower plate 12B and left and right side plates 12
It is formed as a rectangular cylindrical body composed of C and 12D, and its both ends are closed by lids (not shown).

Reference numeral 13 denotes a fixed arm provided on one end side of the frame body 12 and protruding toward the resin tube 11. The fixed arm 13 is, as shown in FIGS.
It is composed of a short-axis rod-shaped arm portion 13A and a sphere portion 13B integrated with the distal end side of the arm portion 13A. The base portion of the arm portion 13A of the fixed arm 13 is fixed to the lower plate 12B or the like of the frame body 12, and a support portion 14 described later is swingably attached to the spherical portion 13B on the distal end side.

Reference numeral 14 denotes a fixed-side support portion provided on the fixed arm 13 so as to be swingable. The fixed-side support portion 14 extends in the longitudinal direction of the resin tube 11 as shown in FIGS. 4 and is formed in an equiped trapezoidal shape in the circumferential direction of the resin tube 11 as shown in FIG. The contact portion 14A is formed in a concave curved shape corresponding to the outer peripheral surface of the resin tube 11 so as to make contact.

Further, the fixed side support portion 14 has an insertion hole 1 located at the upper end side thereof and into which the spherical portion 13B is inserted.
4B, a plate-shaped sphere receiving portion 15 having a curved sliding contact surface 15A corresponding to the outer peripheral surface of the sphere portion 13B of the fixed arm 13 is provided on the bottom side of the insertion hole 14B. It is fixed. The fixed-side support portion 14 is swingably held by the spherical portion 13B of the fixed arm 13 by a cover plate 16 described below provided on the upper end thereof, and the resin tube 1
1 is supported by the contact portion 14A.

Reference numeral 16 denotes a ring-shaped cover plate provided on the upper end surface of the fixed-side support portion 14. The cover plate 16 has a through hole 16A formed in the center thereof. Are integrally attached to the upper end face via a plurality of bolts 17, 17,....

Here, the diameter of the through hole 16A of the cover plate 16 is larger than that of the arm portion 13A of the fixed arm 13,
And it is formed smaller than the diameter of the spherical part 13B, thereby preventing the spherical part 13B inserted into the insertion hole 14B of the support part 14 from coming out of the insertion hole 14B,
The arm portion 13A is made to protrude from the insertion hole 14B to the outside via the through hole 16A.

The cover plate 16 has the lower edge of the through hole 16A slidably in contact with the upper outer peripheral surface of the spherical portion 13B of the fixed arm 13, and connects the outer peripheral surface of the spherical portion 13B to the inner peripheral surface of the insertion hole 14B. The fixed-side support portion 14 can be swingably held by the spherical portion 13B of the fixed arm 13 by being slidably brought into contact with the sliding surface 15A of the spherical receiving portion 15.

Reference numeral 18 denotes a movable arm provided on the other end side of the frame body 12. As shown in FIGS. 1 and 2, the movable arm 18 has a cylindrical cylinder portion 18A composed of a hydraulic cylinder or the like, and A rod 18B is provided in the cylinder 18A so as to be extendable and retractable, and a ball 18C is formed integrally with the tip of the rod 18B and formed similarly to the ball 13B of the fixed arm 13. .

The cylinder portion 18A penetrates the other end of the frame body 12 from the upper plate 12A side to the lower plate 12B side, and is fixed to the upper plate 12A and the lower plate 12B. It is attached integrally. Also,
Pressure oil is supplied to and discharged from the cylinder portion 18A of the movable arm 18 from an external hydraulic pressure source (not shown) into the cylinder portion 18A.
A supply / discharge pipe 18 for extending and contracting the rod 18A is connected.

Numeral 19 denotes a movable-side support portion which is swingably provided on the spherical portion 18C of the movable arm 18. The movable-side support portion 19 is, as shown in FIGS. The contact portion 19A is formed in the same manner as the support portion 14 and has a lower end side formed in a concavely curved shape so as to abut on the outer peripheral surface of the resin pipe 11 in the circumferential direction. Further, the movable-side support portion 19 is provided with an insertion hole 19B which is located at the upper end side and into which the spherical portion 18C of the movable arm 18 is inserted. Further, a sphere receiving portion 20 formed similarly to the sphere receiving portion 15 and having a concavely curved sliding contact surface 20A in the center is fixed to the bottom surface side in the insertion hole 19B. The movable-side support portion 19 is swingably held by a spherical portion 18C of the movable arm 18 by a cover plate 21 provided at the upper end thereof, which will be described later.
The contact portion 19A is extended by extending the rod 18B.
Thus, a bending force is applied to the outer peripheral surface of the resin tube 11 to bend the resin tube 11.

Reference numeral 21 denotes a ring-shaped cover plate provided on the upper end surface of the movable-side support portion 19. The cover plate 21 has a through hole 21A formed in the center thereof. Are integrally attached to the upper end face of the first through a plurality of bolts 22, 22,.... A movable arm 1 in the center
8, a through-hole 21A larger than the rod 18B and smaller than the spherical portion 18C is formed.
Are integrally attached to the upper end face of the first through a plurality of bolts 22, 22,....

Here, the through hole 21A of the cover plate 21 is formed to have a diameter larger than the width dimension of the rod 18B of the movable arm 18 and smaller than the diameter of the spherical body portion 18C. The spherical portion 18C inserted into the insertion hole 19B of the support portion 19 is prevented from being pulled out of the insertion hole 19B, and the rod 18B is projected from the insertion hole 19B to the outside via the through hole 21A. ing.

The lower edge of the through-hole 21A is slidably contacted with the outer peripheral surface of the spherical portion 18C of the movable arm 18, and the outer peripheral surface of the spherical portion 18C is inserted into the insertion hole of the support portion 19 on the movable side. By slidingly contacting the inner peripheral surface of 19B and the sliding contact surface 20A of the sphere receiving portion 20, the movable supporting portion 19
Can be swingably held by the spherical portion 18C of the movable arm 18.

23A, 23B, 23C... Are located between the fixed-side and movable-side bearings 14, 19, respectively.
2 is provided with a plurality of handles (each handle 23 as a whole).
Each handle 23 is formed in a substantially U-shape as shown in FIGS. 1 to 3, and the handle 23A is
Only one piece is fixed at the center of A along the length direction.
The other handle portions 23B and 23C are connected to the respective side plates 12C and 1C.
Two pieces are fixed on the lower side of the 2D to be separated from each other to the left and right along the length direction.

Each handle portion 23 facilitates the carrying of the frame body 12 by the operator grasping each handle portion 23 when changing the mounting position of the bending device with respect to the resin tube 11. It is.

Reference numerals 24, 24 denote two holding bands for holding the resin tube 11 so as to clamp the resin tube 11 to the frame body 12 between the contact portions 14A, 19A of the bearing portions 14, 19, respectively. The holding band 24 is wound, for example, around a central portion on the outer peripheral side of the frame body 12 and a central portion on the outer peripheral surface of the resin pipe 11 via a handle portion 23A, and both ends of the holding band 24 are connected to the connecting tools 24A,
24A, they are connected to each other on the side plate 12D side.

Here, each of the connecting tools 24A is provided with, for example, a ratchet mechanism (not shown), so that both sides of the holding band 24 can be easily attached and detached, and the length of the holding band 24 can be easily reduced. Can be adjusted. Further, each holding band 24 is passed between the handle portion 23A on the upper plate 12A side and the upper plate 12A, thereby preventing the displacement of each holding band 24. And
The length of each holding band 24 is adjusted by the connecting portion 24A, and the resin tube 11 is connected to the abutting portions 14A, 14A of the supporting portions 14, 19, respectively.
It is possible to reliably clamp (hold) the frame body 12 between 19A.

The resin tube bending apparatus according to the present embodiment has the above-described configuration, and the operation thereof will be described below.

First, as shown in FIG. 1, the contact portions 14A and 19A of the support portions 14 and 19 are brought into contact with the outer peripheral surface of the resin tube 11, and each holding band 24 is inserted into the handle portion 23A of the frame body 12. The resin tube 11 and the frame 1
2, the resin tube 11 is held in a clamped state with respect to the frame body 12.

Next, in this state, when the pressure oil from the hydraulic pressure source is supplied into the cylinder portion 18A via the supply / discharge pipe 18D,
The rod 18B extends toward the resin pipe 11 by the pressure of the pressurized oil, and a large pressing force (bending force) acts on the outer peripheral surface of the resin pipe 11 via the abutting portion 19A of the support portion 19. Become. At this time, since the left half of the resin pipe 11 is strongly pressed by the holding bands 24 against the contact portion 14A of the fixed-side support portion 14, the pressing force (bending force) from the contact portion 19A side. A large bending moment can be applied to the right half of the resin pipe 11, and the resin pipe 11 can be bent by an arbitrary angle according to the degree of extension of the rod 18B of the movable arm 18, as shown in FIG.

Here, since the movable-side support portion 19 is swingably held by the spherical portion 18C of the movable arm 18,
Even when the bending angle of the resin tube 11 gradually increases with the extension of the rod 18B, the contact portion 1 of the support portion 19
9A can be held in a state of contact with the outer peripheral surface of the resin pipe 11 with a large contact area as shown in FIG. 2, and the bending force of the rod 18B of the movable arm 18 can be applied to the resin pipe 11 efficiently. Can be.

Therefore, according to the present embodiment, the movable arm 1
8 by extending the rod 18B.
The pressing force (bending force) from the contact portion 19A can be efficiently transmitted to the outer peripheral surface of the resin pipe 11, and the resin pipe 1
1 can be bent with a sufficiently large angle.

Further, by winding each holding band 24 around the outer peripheral surface of the resin tube 11 and the outer peripheral side of the frame body 12, the resin tube 11 is fixedly and movablely supported.
Since the holding members 24 are held in a clamped state with respect to the frame body 12 between the members 9, the bending device can be easily attached to the resin pipe 11 by attaching and detaching each holding band 24 via the connecting tool 24 </ b> A. Can be removed, and the time spent for such work can be greatly reduced, and workability can be reliably improved. In addition, each holding band 2
4 from the position of the handle portion 23A to the handle portions 23B, 2B.
By moving to the left or right along the length direction of the frame body 12 in FIG. 1 to the position of 3C,
The bending position of the resin tube 11 can be easily changed.

Further, the fixed and movable bearings 1
4 and 19 are respectively connected to the arm 13A and the rod 18B.
In such a manner that the side plate 12C (or the side plate 12D) of the frame body 12 is installed (grounded) together with the resin tube 11 on the flat ground, for example, so that the resin tube 11 is parallel to the ground. The side plate 12C of the frame body 12 (or the side plate 12
D) with each support 1
4 and 19 are connected in the axial direction of the arm 13A and the rod 18B.
In this state, the contact portions 14A and 19A of the support portions 14 and 19 can abut on the outer peripheral surface of the resin pipe 11 widely, whereby the resin pipe 11 can be inclined. 11 can be easily bent in the left-right direction parallel to the ground.

Further, each of the handle portions 23A, 23B, 2
By providing the 3C on the frame body 12, the frame body 12 can be easily carried, and when the bending device is mounted on the resin tube 11, the mounting position can be easily changed.

In addition, for example, the upper plate 12 of the frame body 12
Since each holding band 24 is passed between A and the handle portion 23A on the upper plate 12A side, displacement of each holding band 24 can be effectively prevented, and each holding band 2
4, the resin tube 11 is fixed and movable.
4 and 19, the frame body 12 can be securely clamped.

In the above embodiment, each of the handle parts 23B,
23C is provided on each of the side surfaces 12C and 12D of the frame body 12, and only one handle portion 23A is provided on the upper plate 12A. However, the present invention is not limited to this. Two or more plates may be provided on the plate 12A, or each of the handle portions 23B, 2B may be provided on each of the side surfaces 12C, 12D.
3C or more may be provided for each of the 3Cs.
While carrying the frame body 12 can be made easier,
When each holding band 24 is wound around the frame body 12, regardless of the winding position, each holding band 24
Can be passed between the handle portion 23 and the frame body 12, and the displacement of each holding band 24 can be effectively prevented.

In the above-described embodiment, two holding bands 24 are provided. However, the present invention is not limited to this. For example, only one band may be provided, or three or more bands may be provided. The resin tube 1 is held by each holding band 24.
1 can be more reliably held between the fixed-side and movable-side bearings 14 and 19.

Further, in the above embodiment, the movable arm 18
It has been described that the rod 18B expands and contracts by supplying pressure oil into the cylinder portion 18A. However, the present embodiment is not limited to this. For example, an internal thread portion is provided on the inner peripheral surface in place of the cylinder portion 18A. In addition to providing the formed tubular portion, a threaded portion is formed on the base end side of the rod 18B so as to be screwed into the female threaded portion of the tubular portion, and the rod is manually rotated in the circumferential direction to expand and contract the rod. You may make it do.

[0048]

As described in detail above, according to the present invention, the movable member having the contact portion extending in the circumferential direction of the resin tube so as to contact the outer peripheral surface of the resin tube widely as described in the first aspect. Since the supporting portion on the side of the movable arm is configured to be swingably provided on the tip end side of the rod of the movable arm, the bending force from the supporting portion on the movable side can be efficiently applied to the outer peripheral surface of the resin pipe, Thereby, the resin tube can be bent sufficiently large.

Further, since a substantially U-shaped handle portion is provided between the fixed arm and the movable arm and provided at an intermediate portion in the longitudinal direction of the frame body, the frame body can be easily carried. When the resin pipe bending device is mounted on the resin pipe, the mounting position can be easily changed, and the work efficiency of such a work can be effectively improved.

Further, a structure in which a detachable holding band is wound between the frame body and the resin tube via a handle portion to hold the resin tube between the fixed side and the movable side support portions. Therefore, the resin pipe bending apparatus can be easily attached to and detached from the resin pipe by attaching and detaching the holding band, and this is spent for mounting and removing the resin pipe bending apparatus. Time can be greatly reduced, and workability can be reliably improved. Further, the displacement of the holding band can be effectively prevented, and the resin tube can be reliably held between the fixed side and the movable side supporting portions by the holding band.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing a state in which a bending device according to an embodiment of the present invention is mounted on a resin pipe.

FIG. 2 is a front view similar to FIG. 1, showing a state where a rod of a movable arm is extended and a resin tube is bent.

FIG. 3 is a cross-sectional view taken along a line III-III in FIG. 1 showing a frame body, a cylinder portion, and the like.

FIG. 4 is an enlarged sectional view taken in the direction of arrows IV-IV in FIG.

FIG. 5 is an explanatory cross-sectional view showing a work site where a conventional resin pipe bending apparatus is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Resin pipe 12 Frame body 13 Fixed arm 14, 19 Support part 14A, 19A Contact part 18 Movable arm 18A Cylinder part 18B Rod 23A, 23B, 23C Handle part 24 Holding band

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shiro Aruga 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Takashi Anamizu 1-7-7 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture No. Tokyo Gas Co., Ltd. Conduit Technology Development Center (72) Inventor Takaro Yoshii 1-7-7 Suehirocho, Tsurumi-ku, Yokohama, Kanagawa Prefecture Tokyo Gas Co., Ltd. Conduit Technology Development Center

Claims (1)

(57) [Claims] 1. A frame body formed with a certain length so as to extend in the length direction of a resin pipe, and provided on one end side of the frame body, and a tip side has a certain length toward an outer peripheral surface side of the resin pipe. A fixed arm protruding at a fixed angle, and a fixed-side support portion having a contact portion attached to the distal end side of the fixed arm and extending in the circumferential direction of the resin tube so as to widely contact the outer peripheral surface of the resin tube. A movable arm that is provided at the other end of the frame body and is separated from the fixed arm and that expands and contracts a rod toward the outer peripheral surface of the resin tube; and a swingable arm is provided at the rod tip side of the movable arm. A movable-side support portion having a contact portion extending in the circumferential direction of the resin tube so as to contact the outer peripheral surface of the resin tube in a wide range; An approximately U-shape provided in the middle part of the frame body in the length direction A handle portion, and a detachable holding band that is wound between the frame body and the resin tube via the handle portion and holds the resin tube between the fixed side and the movable side support portion. A resin tube bending device configured.