JP3386022B2 - Method and apparatus for manufacturing bent piping and laminate of piping - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bent pipe manufacturing method and manufacturing device for bending pipes in a zigzag shape to obtain pipes such as cooling pipes for storing ice.

[0002]

2. Description of the Related Art FIGS. 11A to 11D show a conventional manufacturing method step by step. Referring to these, FIG.
As shown in (a), the first and second bending rollers 91 and 92 that also serve as the feeding rollers of the pipe 90 are provided, and the feeding mechanism 93 is in the home position between the bending rollers 91 and 92. A predetermined amount of pipe 90 is fed onto the rotary table 94. Each bending roller 91, 92 has a pipe 90.
A pipe holding portion is provided to hold the pipe when bending the pipe.

Then, as shown in FIG. 11 (b), the rotary table 94 is rotated by 180 ° in the clockwise direction together with the pipe holding portions of the bending rollers 91, 92, and the bending rollers 91, 9 are rotated.
After the portion of the pipe 90 at the tip of 2 is folded back to form the U-shaped portion 96, the bending roller 91 having the pipe holding portion turns in the direction of the white arrow and returns to the original position. Next, as shown in FIG. 11C, after the rotary table 94 rotates counterclockwise by 180 ° and returns to the home position, the feeding mechanism 93 causes the feeding rollers 93 to move between the bending rollers 91, 9.
A predetermined amount of pipe 90 is fed through 2.

Then, as shown in FIG. 11D, the rotary table 94 is moved counterclockwise from the home position by 18 degrees.
It is rotated by 0 °, and the entire U-shaped portion 96 is folded back in the opposite direction. By repeating such a process, alternate zigzag pipes are bent.

[0005]

However, in the above manufacturing method, since the large rotary table 94 is swiveled, the equipment becomes large. Particularly when the pipe is a cooling pipe for ice heat storage, for example, a relatively soft pipe having a diameter of about 6 mm is bent every 1.5 to 2 m. In such bending every 1.5 to 2 m, it is necessary to support the important points of the pipe, and the large rotary table 94 for supporting the pipe cannot be abolished.

Further, it is difficult to shorten the processing time because the pipe feeding work cannot be performed until each bending process of the pipe in which the rotary table rotates is completed. The present invention has been made in view of the above problems,
An object of the present invention is to provide a manufacturing method and a manufacturing apparatus for a bent pipe, which enables a pipe manufacturing operation to be carried out speedily without taking up space.

[0007]

Means for Solving the Problems and Effects of the Invention In order to achieve the above-mentioned object, the invention according to claim 1 alternately arranges a pipe in a figure-eight shape on a pair of bending columns extending in parallel at a predetermined distance. While winding, laminated in the direction in which the bending struts extend
After that, the formed laminated body is removed from the bending column, and the laminated body is removed.
By expanding the winding start and winding end of the
Provided is a method for manufacturing a bent pipe, characterized by obtaining a bent pipe in a zigzag shape . In the present invention, since the laminated body of the pipe in the process of being formed is wound around and held by the pair of bent struts in a figure-eight shape, it is possible to prevent deformation of the pipe while saving space with a simple structure. it can.

[0008] By moving along the direction of extension of the strut to bend the stack of the pipe, it can be easily removed without causing collapse mold laminate.

[0009] is et al., The laminate removed from the bending strut spread laterally to solve the laminate, bending zigzag
You can get the piping .

[0010] According to a second aspect of the invention, the displacement Te placed <br/> to claim 1, the bending post by rotating a supporting member for supporting the pair of bent struts around a predetermined rotation axis It is characterized in that the pipe is actively pulled out from the pipe feeding mechanism by the bending strut that is displaced. In the present invention, the pipe can be pulled out at the same time as the bending of the pipe, and the process time can be shortened and the processing efficiency can be improved. According to a third aspect of the present invention, in the first or second aspect , a plurality of pipes are simultaneously wound around the pair of bent columns to form a plurality of pipe laminated bodies at the same time. In this case, the manufacturing speed can be doubled or tripled, and a significant cost reduction can be achieved.

According to a fourth aspect of the present invention, the invention is supported by a support body that is bidirectionally driven to rotate about a predetermined rotation axis.
A pair of bending struts that extend parallel to each other at a predetermined distance,
Further comprising a means for moving in a direction parallel to the axis of bending struts piping to provide an apparatus for manufacturing a bent pipe, characterized in. In the present invention, while the support is rotated in reverse at every 180 °, by going wound alternately piping pair of bending struts, when going bent so as to draw a figure eight in succession piping Then, it becomes necessary for the pipe to get over the bending column, which is the fulcrum of bending, and this can be achieved by performing the operation of temporarily raising the pipe of the feeding path and then lowering it.

According to a fifth aspect of the present invention, in the fourth aspect , a strain relief mechanism having a supporting member for supporting a plurality of rollers arranged alternately in a zigzag pattern is arranged in the feeding path of the pipe, The member is rotatably supported around a predetermined rotation axis so that the path of the pipe in the strain relief mechanism always faces the tangential direction of the bending column, which is the fulcrum of bending. To do. Usually, in the bending apparatus, a strain relief mechanism for eliminating the bending strain of the pipe is arranged in the feeding path. If the position of the strain relief mechanism is fixed when the bending strut is displaced, the upstream and downstream paths of the strain relief mechanism will intersect diagonally, and the piping will be immediately after leaving the strain relief mechanism. It will be bent. For this reason, the pipes from which the bending and strain have been removed are again strained.

On the other hand, according to the present invention, since the path in the strain relief mechanism is oriented in the tangential direction of the bending column,
No strain occurs in the pipe when exiting the strain relief mechanism. According to a sixth aspect of the present invention, in the fourth aspect , a strain relief mechanism having a plurality of rollers arranged alternately in a zigzag pattern is arranged in the delivery route of the pipe, and the route of the pipe in the strain relief mechanism. The predetermined rotation axis of the support of the bending strut is displaced so that it always faces the tangential direction of the bending strut that is the fulcrum of bending. According to the present invention, it is possible to prevent the pipe from being bent and being distorted when coming out of the strain relief mechanism.

[0014] According to a seventh aspect, it claims 4, 5 or
In 6 , the means for moving is characterized in that the strain relief mechanism is moved in a direction parallel to the axis of the bending strut so that the pipe passes over the bending strut which is the fulcrum of bending next. . In the present invention, 8
When drawing the character, it is necessary for the pipe to go over the bending column which becomes the fulcrum of bending next, but this can be achieved by performing the operation of raising the strain relief mechanism once and then lowering it.

The invention according to claim 8 is the invention according to claims 4 to 7.
In any one of the above, the peripheral surface of the bending column has a groove for holding a pipe to be bent. In the present invention, the pipes can be stacked along the bending column at a precise pitch, and since the pipe does not shift in the axial direction of the bending column, the pipe is not entangled. . The invention according to claim 9 is the claim
In any one of 4 to 8 , it is characterized in that the bending column is composed of at least two vertically divided divided bodies so that the bending column can be reduced in diameter. When the pipe is held by the groove of the bending column, it is difficult to pull out the laminated body from the bending column in the axial direction. Therefore, in the present invention, the laminated body can be easily removed from the bent column by reducing the diameter of the bent column.

According to a tenth aspect of the present invention, in the ninth aspect , the bending strut is composed of a pair of divided bodies, which are arranged in a wedge-shaped space formed between these divided bodies, and both divided bodies are arranged in a radial direction. It is characterized by further comprising a biasing means for biasing, a wedge-shaped member in contact with both divided bodies in the wedge-shaped space, and a drive means for moving the wedge-shaped member forward and backward. In the present invention, the drive means is a wedge-shaped member diameter bending strut by pushing the wedge-shaped spaces, also drive means by retracting the wedge member, decrease the diameter of the bending strut by a biasing means.

According to an eleventh aspect of the present invention, in the ninth aspect , the bending strut is composed of a pair of split bodies which are connected to each other so as to be relatively rotatable around a connecting shaft parallel to the axis of the bending strut. It is characterized by further comprising a link mechanism for connecting portions of the body apart from the connecting shaft, and a drive means for expanding / contracting the diameter of the bending column via the link mechanism. In the present invention, the driving means expands or contracts the diameter of the bending column via the link mechanism.

[0018] The invention of claim 1 wherein, in any one of claims 4 to 1 1, is supported by the support, and clamping the pipe between the corresponding bent struts straightening bulge of the pipe It is characterized by further comprising a straightening roller. In the present invention, it is possible to prevent the pipe that is bent by using the bending column as a fulcrum for bending from expanding, and it is possible to achieve accurate bending. Claim 13
Of the invention as an intermediate for manufacturing a zigzag bent pipe.
, Which is a laminated body of pipes, wound alternately in a figure eight shape.
And a laminated body of pipes laminated in a predetermined direction .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of an essential part of a bending pipe manufacturing apparatus according to a first embodiment of the present invention.
In the present embodiment, the straight pipe 2 delivered through the delivery path 1 is alternately wound around a pair of bending struts 3 and 4 extending in parallel at a predetermined distance in an 8 shape (crossing shape), The bending columns 3 and 4 are laminated in a plurality of stages at predetermined intervals in the extending direction of the bending columns 3 and 4 to form a laminated body 5 of bending pipes. After removing this laminated body 5 from the bending columns 3 and 4, the laminated body 5
By expanding the winding start 5a and the winding end 5b in the lateral direction as shown in FIG. 2 (a), a zigzag product pipe P as shown in FIG. 2 (b) is obtained.

Referring to FIG. 1 and FIG. 3 which is a schematic side view of the manufacturing apparatus, the bending columns 3 and 4 are supported by both ends of a supporting body 6 and extend in parallel with each other. A support shaft 8 having a rotation axis 7 is integrally rotatably connected to a central portion of the support body 6. The support shaft 8 is drivingly connected to a rotating shaft 11 of a motor 10 via a reduction mechanism 9. The speed reduction mechanism 9 and the motor 10 are fixed on the base B. on the other hand,
At the start end of the feeding path 1, the pipe 2 is wound, and a rotatable roll body 12 is arranged around a rotation axis 13 and the pipe 2 is fed from the roll body 12 via a strain relief mechanism 14. It is adapted to be supplied to the bent columns 3 and 4.

The strain relief mechanism 14 comprises a plurality of rollers 15 arranged alternately in a zigzag pattern, and a support member 16 for rotatably supporting these rollers. The pipe 2 unwound from the wound roll body 12 has a bending strain (bending tendency), but the bending strain is removed when passing between the plurality of rollers 15. The support member 16 is supported by a drive member 17 such as an air cylinder,
It is designed to move up and down. Bend the pipe 2
When it is wound in the shape of a figure of 8 on the 4th, the driving member 17 gradually lifts the pipe 2 of the feeding path 1 through the strain relief mechanism 14 in the direction along the axes 3a, 4a of the bending columns 3, 4. The pipes of the laminated body 5 are prevented from overlapping each other. Further, when the pipe 2 needs to get over the bending columns 3 and 4, the driving member 17 once lifts the pipe 2 of the feeding path 1 via the strain relief mechanism 14 and then lowers it to get over the bending columns 3 and 4. This is to allow it.

The support member 16 is supported by the drive member 17 so as to be rotatable about an axis 18 orthogonal to the support member 16. This is to prevent bending strain from occurring again in the pipe 2 from which the strain has been removed by the strain relief mechanism 14. As shown in FIGS. 4A, 4 </ b> B, and 4 </ b> C, the rotation axis 7 of the support 6 is arranged on a line L that extends in parallel with the feeding path 1 in close proximity. Then, the support 6 is rotated and the bending rods 3 and 4 are used to move the support 6 as shown in FIG.
As shown in (a), (b), and (c), when the pipe 2 is bent, the swiveling bending support pillar 3 serving as the fulcrum of the bending moves away from the strain relief mechanism 14, and the strain relief mechanism is removed. The pipe 2 is actively fed out from the feeding mechanism 12 (see FIG. 3) via 14. That is, the pipe 2 can be drawn out at the same time while bending the pipe 2, and the manufacturing speed can be remarkably increased as compared with the conventional case in which the bending and the drawing steps are separately performed.

Further, when the pipe 2 is paid out in accordance with the bending operation, the support member 16 of the strain relief mechanism 14 rotates around the axis 18, and the path 19 in the strain relief mechanism 14 serves as a fulcrum for bending. It is designed to face the tangential direction of 3. Since it is straightly discharged from the path 19 in the strain relief mechanism 14 to reach the bending strut 3, no bending strain occurs during this period. 4 (a), (b) and (c), 20 and 21 are straightening rollers facing the bending columns 3 and 4, respectively.
The pipe 2 is supported between the pipe 2 and the corresponding bending columns 3 and 4, and the bulge of the pipe 2 is corrected. Although not shown, the straightening rollers 20 and 21 are slidably and rotatably supported by the stays extending in the lateral direction of the corresponding support body 6, and the corresponding bending columns 3 and 4 are further driven by a drive mechanism (not shown). And the posture in which the pipe 2 is sandwiched between the pipes 2 and 3 and the posture in which the pipe 2 is released from the corresponding bent columns 3 and 4 by releasing the distance. Figure 4
In (a), (b) and (c), the straightening roller 20 is in the former posture of sandwiching and the straightening roller 21 is in the posture of releasing the latter sandwiching.

Next, the manufacturing process will be described in sequence with reference to the schematic plan views of FIGS. First, FIG.
As shown in (a), the supporting bodies 6 of the bending struts 3 and 4 are placed along the line L described above along the same side of the bending struts 3 and 4 (opposite side of the straightening rollers 20 and 21). Next, as shown in FIG. 5 (b), the pipe 2 is allowed to pass over the bending column 3 and the bending column 3 and the straightening roller 2 in the releasing posture
0, and then the straightening roller 20 is displaced as shown in FIG. 5C, and the pipe 2 is sandwiched between the straightening roller 20 and the bending column 3.

Next, as shown by the white arrow in FIG. 5C, the support 6 is rotated counterclockwise about the rotation axis 7 by 18 degrees.
It is rotated by 0 °, and the portion of the pipe 2 at the tip of the bending column 3 is folded back by using the bending column 3 as a fulcrum for bending,
The state shown in FIG. Then, in FIG. 5 (d),
After the bending column 4 serving as the fulcrum of bending is overlaid on the pipe 2, the straightening roller 21 is displaced to displace the straightening line between the straightening roller 21 and the bending column 4 as shown in FIG. 5 (e). 2 is clamped and the straightening roller 20 is displaced to release the pinching of the pipe 2 between the straightening roller 20 and the bending column 3.

Next, from the state shown in FIG. 5 (e), the support 6 is rotated clockwise by 180 °, which is shown in FIG.
As shown in (f), a complete figure 8 is formed to complete one layer of the laminated body, and the straightening roller 21 is displaced to release the pinching of the pipe 2 between the straightening roller 21 and the bending column 4. To do. After that, the same operation is repeated to form the laminated body 5 by laminating the 8-shaped pipes. When the laminated body 5 is completed, it is removed from the bending columns 3 and 4, and then the zigzag product pipe P is obtained as shown in FIGS. 2A and 2B described above.

In the first embodiment, since the laminated body 5 in the process of being formed is wound around a pair of bending struts and held in a shape of a figure 8, the deformation of the pipe 2 can be achieved with a simple structure while saving space. Can be prevented. Further, the pipe 2 can be pulled out (extended) at the same time as the pipe 2 is bent, so that the process time can be greatly shortened and the processing efficiency can be improved. Therefore, an accurate bending pipe can be manufactured speedily and at low cost.

Further, the strain relief mechanism 14 is moved up and down when required, so that the pipe 2 serves as a fulcrum for bending next.
By surmounting the above condition, it is possible to continuously perform the bending in the shape of a figure 8. Furthermore, since the path 19 in the strain relief mechanism 14 is always oriented in the tangential direction of the bending column 3 (or 4) that serves as the fulcrum of bending, strain may occur in the pipe 2 when leaving the strain relief mechanism 14. Can be prevented.

Next, FIGS. 6A to 6C show a second embodiment of the present invention. In the embodiment of FIG. 4,
In order to direct the path 19 in the strain relief mechanism 14 to the bending column 3 serving as the fulcrum of bending, the strain relief mechanism 14 is rotatable about the axis 18. On the other hand, in the second embodiment, the posture of the strain relief mechanism 14 is fixed,
As shown in FIGS. 6A to 6C, the bending column 3 (or 4) serving as the fulcrum of bending is on the extension line of the path 19 in the strain relief mechanism 14 (actually, on the line L adjacent to this). So that the rotation axis 7 of the support 6 is always located at the line L.
This is a point that is displaceable on an axis K that is orthogonal to.

Since the bending strut 3 is located on the line L offset from the extension line of the path 19 by a predetermined distance (actually, the radius of the bending strut), the extension line of the path 19 is tangential to the bending strut 3. It is designed to follow the direction.
Also in this embodiment, it is possible to prevent the strain from occurring in the pipe 2 when exiting the strain relief mechanism 14. Next, FIG. 7 shows a third embodiment of the present invention. In the third embodiment, grooves 22 for holding bendable pipes are provided on the peripheral surfaces of the bending columns 3 and 4 (only the bending column 3 is shown in FIG. 7). The groove 22 may have a spiral shape that winds around the entire circumference of the bending column 3 (or 4), or may have an inclined groove only at a portion around which the pipe 2 is wound instead of around the entire circumference. In the third embodiment, the pipes 2 can be stacked along the bending struts 3 and 4 at an accurate pitch, and the pipes 2 are displaced in the axial direction of the bending struts 3 and 4. Since it does not happen, the pipe 2 will not be entangled during stacking.

When the grooves 22 are provided in the bending columns 3 and 4 as shown in FIG. 7, it may be difficult to remove the laminated body 5 from the bending columns 3 and 4. Therefore, the bending columns 3, 4
We propose fourth and fifth embodiments having a structure for expanding or contracting the diameter of the. First, in the fourth embodiment shown in FIGS. 8A and 8B, the bending column 3
(4) A pair of vertically-divided divided bodies 23 so that the diameter can be reduced,
24. Opposing surface 2 of these divided bodies 23, 24
A wedge-shaped space 27 is formed between 5 and 26. In the wedge-shaped space 27, an urging member 28, which is composed of, for example, a tension coil spring, which urges the two divided bodies 23 and 24 in the radial direction, is interposed. Further, in the wedge-shaped space 27, a wedge-shaped member 30 which is slid by a driving member 29 formed of, for example, an air cylinder is interposed. In the figure, 31 indicated by a broken line is a support member that slidably supports the wedge-shaped member 30.

In the fourth embodiment, as shown in FIG. 8A, the driving member 29 pushes the wedge-shaped member 30 into the wedge-shaped space 27 so that the bending column 3 can be expanded. Further, as shown in FIG. 8B, the driving member 29 pulls back the wedge-shaped member 30 to reduce the diameter of the bending strut 3 by the urging member 28, so that the pipe stack can be easily formed from the bending strut 3. Can be removed. Next, in the fifth embodiment shown in FIGS. 9A and 9B, the bending column 3 (4) is composed of a pair of divided bodies 33 and 34, and the corresponding divided bodies 33 and 34 correspond to each other. The side edges of 1 are connected to each other about a connecting shaft 32 parallel to the axis of the bending column 3 (4) so as to be relatively rotatable. As the connecting shaft 32, for example, a shaft included in trillion may be used.

Further, the second side edges of both divided bodies 33, 34 are connected by a link mechanism 38. Link mechanism 3
Reference numeral 8 is, for example, a two-node pair in which opposed ends of two elements 35 and 36 are connected to each other by a connecting portion 37 so as to be relatively rotatable. The connecting portion 37 is rotatably connected to a rod end of, for example, an air cylinder 39 serving as a driving member 39. The driving member 39 is connected to the bending column 3 via the link mechanism 38.
The diameter of (4) is enlarged as shown in FIG. 9 (a) or reduced as shown in FIG. 9 (b). Also in the fifth embodiment, the same operational effect as that of the fourth embodiment is obtained.

The present invention is not limited to the above embodiments, and for example, as shown in FIG. 10, a plurality of pipes 2 and 2 are simultaneously wound around bending columns 3 and 4 to form a plurality of laminated layers. The body may be manufactured at the same time. The plurality of pipes 2 and 2 are provided with a predetermined space therebetween along the extending direction of the bending columns 3 and 4. Plural grooves corresponding to the plural pipes 2 may be formed in the bending columns 3 and 4, respectively. In the case of the example in FIG. 10, the manufacturing speed can be significantly improved, and the manufacturing cost can be reduced. In addition, since the plurality of manufactured laminated bodies do not intersect with each other, they can be easily separated from each other after the plurality of laminated bodies are removed from the bending columns 3 and 4.

Besides, various modifications can be made within the scope of the present invention.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a bending pipe manufacturing apparatus according to a first embodiment of the present invention.

2A and 2B are schematic diagrams sequentially showing a state in which a laminated body of pipes manufactured by the manufacturing apparatus of FIG. 1 is expanded to be product pipes.

FIG. 3 is a schematic side view of the entire manufacturing apparatus of FIG.

4A to 4C are process drawings for explaining the operation of the strain relief mechanism and the bending support.

5 (a) to 5 (f) are process diagrams sequentially showing that the bending column is swung to wind the pipe in an 8-shape.

6 (a) to 6 (c) are process diagrams showing an essential part of the manufacturing apparatus according to the second embodiment of the present invention, and explaining the operations of the strain relief mechanism and the bending column.

FIG. 7 is an enlarged side view showing a bending column of a manufacturing apparatus according to a third embodiment of the present invention.

8 (a) and 8 (b) are schematic plan views showing the operation of the mechanism for enlarging and reducing the diameter of the bending column in the fourth embodiment of the present invention.

9 (a) and 9 (b) are schematic plan views showing the operation of the mechanism for enlarging and reducing the diameter of the bending column in the fifth embodiment of the present invention.

FIG. 10 is a side view of a bending column according to a sixth embodiment of the present invention.

FIG. 11 is a schematic process diagram sequentially showing a manufacturing operation in a conventional bending pipe manufacturing apparatus.

[Explanation of symbols]

1 Feeding route 2 piping 3,4 Bending support 3a, 4a axis 5 laminate 5a start winding 5b winding end 6 support 7 Rotation axis P Product piping 10 motors 12 rolls (feeding mechanism) 14 Strain relief mechanism 15 Laura 16 Support member 17 Drive member 18 axis 19 routes 20,21 Straightening roller 22 groove 23,24 division 27 Wedge-shaped space 28 Biasing member 29 Drive member 30 wedge-shaped member 32 connection shaft 33,34 division 38 Link mechanism 39 Drive member

Continuation of the front page (56) References JP-A-4-123827 (JP, A) JP-A-3-42124 (JP, A) JP-A-60-196227 (JP, A) Jitsuko Sho-47-25787 (JP , Y1) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21D 53/06 B21D 7/00 B21D 3/05

Claims (13)

(57) [Claims] 1. A pipe (2) is alternately wound around a pair of bending struts (3, 4) extending in parallel at a predetermined distance from each other,
Formed after stacking in the direction of extension of the bending struts (3,4)
Remove the stack (5) from the bending columns (3,4) and remove the stack (5)
The winding start (5a) and winding end (5b) of the above laminate (5)
Zigzag By expanding laterally to solve the laminate
A method for producing a bent pipe, which comprises obtaining a bent pipe (P) . 2. A support for supporting the pair of bending columns (3, 4).
To rotate the body (6) around a predetermined rotation axis (7)
The bending struts (3, 4) are displaced further, and the bending struts (3, 4) are displaced.
4) from the feeding mechanism (12) of the pipe (2) to the pipe (2)
The method according to claim 1, wherein the
The method of manufacturing bending pipe. 3. A plurality of pipes on the pair of bent columns (3, 4)
(2,2) is wound at the same time to form a stack (5,5) of pipe (2).
Serial to claim 1 or 2, characterized by forming several simultaneously
Method for producing a mounting of the bending pipe. 4. Bidirectional rotation about a predetermined rotation axis (7)
It is supported by a driven support (6) and is
A pair of bent struts (3,4) extending parallel to each other and a pipe (2)
Is moved in a direction parallel to the axes (3a, 4a) of the bending columns (3, 4).
Causing means (17) and the apparatus for manufacturing a bending pipe you comprising: a. 5. An outlet line (1) for the pipe (2) is connected to
A support for supporting a plurality of rollers (15) arranged in a staggered pattern.
A strain relief mechanism (14) having a holding member (16) is arranged and supported.
The member (16) is the path (19) of the pipe (2) in the strain relief mechanism (14).
Is the fulcrum of bending and the tangential direction of the bending columns (3, 4) is
Free to rotate around a given rotation axis (18) so that it is always facing
The bent pipe manufacturing apparatus according to claim 4, wherein the bent pipe manufacturing apparatus is supported by . 6. The feed path (1) of the pipe (2) is connected to
Supporting supporting a plurality of rows la (15) arranged in staggered each other
A strain relief mechanism (14) having a holding member (16) is arranged, and
The path (19) of the pipe (2) in the strain relief mechanism (14) is the bending fulcrum.
Always face the tangential direction of the bent struts (3, 4)
In addition, the supporting shaft (6) of the bending column (3, 4) has a predetermined rotation axis (7).
5. The bending pipe manufacturing apparatus according to claim 4, wherein the bending pipe is displaced . 7. The moving means (17) is a strain relief mechanism.
Move (14) in a direction parallel to the axes (3a, 4a) of the bending columns (3, 4).
The pipe (2) and then the bending fulcrum.
The apparatus for manufacturing a bent pipe according to claim 4, 5 or 6, wherein the bent pillar (3, 4) is overcome . 8. The curved surface of the bending column (3, 4) is bent.
8. The bending pipe manufacturing apparatus according to claim 4, further comprising a groove (22) for holding the pipe (2) . 9. The diameter of the bending columns (3, 4) can be reduced,
Consists of at least two vertical divisions (23,24; 33,34)
Apparatus for manufacturing a bent pipe according to any one of claims 4, characterized in that the 8. 10. The bending column (3, 4) comprises a pair of split bodies (23, 4) .
24) and is formed between these divided bodies (23, 24)
It is placed in the wedge-shaped space (27), and the two divided bodies (23, 24) are reduced in the radial direction.
The urging means (28) for urging the
The wedge-shaped member (30) in contact with the body (23, 24) and the wedge-shaped member (30) are advanced.
The bending pipe manufacturing apparatus according to claim 9 , further comprising drive means (29) for retracting . 11. The bending strut (3, 4) is the same as the bending strut (3, 4).
Connected relatively freely around the connecting shaft (32) parallel to the axis.
It is composed of a pair of divided bodies (33, 34)
Link that connects the parts apart from the connecting shaft (32) of 4)
The mechanism (38) and the bending strut (3, 4) through the link mechanism (38).
The bending pipe manufacturing apparatus according to claim 9, further comprising a driving means (39) for expanding and contracting the diameter . 12. A support supported by the support (6),
The pipe (2) with the pipe (2) sandwiched between the bent columns (3, 4)
The bending pipe manufacturing apparatus according to any one of claims 4 to 11, further comprising a straightening roller (20, 21) for straightening the bulge . 13. Intermediate for manufacturing a zigzag bent pipe (P).
It is a laminated body (5) of pipes as a body, and is formed into a figure-8 shape.
A laminated body of pipes wound around each other and laminated in a predetermined direction
(Five) .