JPH0358808B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a finned pipe bending device that can bend a pipe provided with a plurality of fins used in heat exchangers such as evaporators, condensers, and radiators. Regarding.

<Conventional technology> Conventionally, as a device for bending pipes,
-59771 publication and Utility Model Application Publication No. 54-95544 are known. The former forms the pipe in a meandering shape;
A groove is provided on the outer circumferential surface of the jig to prevent the pipe from flattening, and the latter is a method in which pipes are arranged side by side on the circumferential surface of the jig so that multiple pipes can be bent at the same time. .

<Problems to be Solved by the Invention> However, all of the above-mentioned conventional bending devices bend a single pipe, and when the above-mentioned conventional bending devices are applied to a pipe with fins, The pipe cannot be removed from the jig after the bending process is completed. Furthermore, if conventional bending devices are applied to ultra-thin pipes or grooved pipes with grooves formed on the inner surface, the crushing rate during bending will increase, making it impractical.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and includes a rotatable top that is rotatably provided at a bending center position of a pipe to be bent. In addition to providing a small diameter part where the distance between the lines is shorter than the distance from the rotation axis to the outer surface of the set pipe,
A large-diameter support part is provided whose distance from the center line to the outside line is approximately equal to the distance to the axis of the set pipe, and a receiving groove for the pipe is provided in the large-diameter support part, and the bending center of the pipe is set to the revolution axis. A revolving top is arranged so as to be able to revolve around the above-mentioned rotating top, and the rotating top is provided with a holding groove corresponding to the receiving groove of the above-mentioned rotating top.

<Function> The pipe is held by the receiving groove provided on the large-diameter support part of the rotating top and the holding groove provided on the protrusion of the revolving top, and the revolving top that revolves around the rotating top holds the pipe.
Pipes can be bent. Moreover, since each piece can be evacuated, the pipe that has been bent can be removed from the bending device.

<Example> Hereinafter, the present invention will be described with reference to an example shown in the drawings.

Finned pipe bending device 1 according to the present invention
has a rotating piece 2 that can rotate at a position O, which is the bending center of a pipe P having fins F, and a revolving piece 3 that faces this rotating piece 2, and both pieces 2 and 3 have grooves for receiving the pipe P. 4 or a holding groove 5 is provided.

For rotating frame 2, the distance r from the center line to the outer line
A small diameter portion 6 whose distance from the axis of rotation is shorter than the distance d from the outer surface of the set pipe P, and a large diameter portion whose distance R from the center line to the outer line is approximately equal to the distance D from the axis of rotation to the axis of the set pipe P. A support portion 7 is provided. Further, the large-diameter support portion 7 is provided with a receiving groove 4 corresponding to the pipe P to be bent. According to the illustrated embodiment, two upper and lower receiving grooves 4 are provided so that the two pipes P can be bent at the same time.
The receiving grooves 4 can be provided as appropriate depending on the number of pipes P to be bent.

On the other hand, the above-mentioned rotating top 2 has a pipe P
A revolution top 3 that can revolve around the center of bending as the revolution axis O' is faced. According to the embodiment shown in FIGS. 1 to 3, this revolving top 3 has a cylindrical shape and has holding grooves 5 on its outer peripheral surface corresponding to the receiving grooves 4 of the rotating top 2. The set pipe P can be held by the holding groove 5.

Further, the above-mentioned revolving top 3 can move away from the rotating top 2 and retreat on a bending surface of the pipe P, in other words, on a surface including the axis of the pipe P to be bent.

The bending operation performed by the bending device 1 as described above is as follows.

First, the tip of the large-diameter support portion 7 of the rotating top 2 is directed toward the rear end of the pipe P (for convenience, the bent end of the pipe P is referred to as the tip and the fixed end is referred to as the rear end), and the small diameter portion The finned pipe P is set in the apparatus 1 in an initial state in which the rotating top 6 is placed in the setting position of the pipe P and the revolving top 3 is retracted from the setting position (FIG. 3). Next, the rotating top 2 is rotated 90 degrees toward the pipe P, the large-diameter support part 7 is turned toward the pipe P, the revolving top 3 is brought close to the pipe P, and the receiving groove 4 and the holding groove 5 are connected to the pipe P. (Figure 3). Then, when the rotating top 2 is further rotated and the rotating top 3 is rotated to revolve around the rotating top 2 with the bending center as the revolution axis, the pipe P is bent in the receiving groove 4 and the holding groove 5 (the third figure). Rotate the rotating top 2 to 270 degrees, and rotate the rotating top 3
When the pipe P is rotated 180 degrees, the pipe P is pressed by the receiving groove 4 and the holding groove 5, and the bending process of the pipe P is completed (FIG. 3). Next, rotate top 2 for another 90
degree to direct the large-diameter support part 7 toward the rear end of the pipe P, and at the same time, the revolution piece 3 is reversed on the revolution trajectory to return to the bending start position (Fig. 3), and further retreated to move it away from the pipe P. Then, both frames 2 and 3 are returned to their initial states (Fig. 3).

In this state, the pipe P is not engaged with any of the pieces 2 and 3, so the pipe P can be easily removed.

According to the bending device 1 as described above, the receiving groove 4 and the holding groove 5 can always be located at the bent portion of the pipe P, and a bent shape without collapse can be obtained. Moreover, since the revolving top 3 can be evacuated from the pipe P after the bending is completed, the pipe P that has been bent can be easily removed from the apparatus, and continuous automatic work is possible.

4 and 5 show a second embodiment of the present invention, in which the rotating top 2 and the revolving top 3 have the same shape, and both the tops 2 and 3 are connected to the curved surface of the pipe P. This makes it possible to retreat in a direction perpendicular to .

That is, the rotating top 2 has a small diameter portion 6 in which the distance from the center line to the outer line is shorter than the distance from the rotating axis to the outer surface of the set pipe P, as in the above embodiment.
and a large-diameter support part 7 whose distance from the center line to the outline line is approximately equal to the distance from the axis of rotation to the center line of the set pipe P. A corresponding receiving groove 4 is provided. On the other hand, the revolving top 3 is provided with a protrusion 9 along the axial direction on the outer peripheral surface of the small diameter cylindrical part 8, and the protrusion 9
A holding groove 5 is provided in the holder. Therefore, the revolving top 3 has the protruding portion 9 and the small diameter cylindrical portion 8.

Furthermore, the rotating top 2 and the revolution top 3 can be retracted in a direction perpendicular to a plane including the axis of the bent pipe P.

The bending operation in the bending device 1 according to the above embodiment is as follows. At the standby position of both the tops 2 and 3 provided below the set position of the pipe P, the large-diameter support portion 7 of the rotating top 2 and the protrusion portion 9 of the revolving top 3 are aligned parallel to each other toward the rear end of the pipe P. The pipe P is set at the set position (FIG. 5). The rotating top 2 and the revolving top 3 are raised so that the pipe P is located between the small diameter portion 6 of the rotating top 2 and the small diameter cylindrical portion 8 of the rotating top 3, and the large diameter of the rotating top 2 is raised. The support part 7 and the protrusion part 9 of the revolving top 3 are rotated 90 degrees so that they face each other, and the pipe P is held by the receiving groove 4 and the holding groove 5 (FIG. 5). By further rotating the rotating top 2 in the same direction and rotating the rotating top 3 around the rotating top 2 with the bending center of the pipe P as the revolution axis,
The pipe P is bent in the receiving groove 4 and the holding groove 5 (FIG. 5). When rotating top 2 rotates to 270 degrees and rotating top 3 to 180 degrees,
The bending process of the pipe P is completed (FIG. 5). Next, the rotating top 2 is further rotated 90 degrees, and
The revolving top 3 is returned to the bending start position by going backwards on the revolving trajectory, and the revolving top 3 is rotated 90 degrees to move the large diameter support portion 7 and the protruding portion 9 of both the tops 2 and 3 toward the rear end of the pipe P. At the same time, the small diameter portion 6 and the small diameter cylindrical portion 8 face the side surface of the pipe P (FIG. 5).
In this state, if both pieces 2 and 3 are lowered to return to the initial state, the bent pipe P
can be removed from the device (Figure 5).

According to the bending device 1 as described above, the receiving groove 4 and the holding groove 5 can always be located at the bent portion of the pipe P, and a bent shape without collapse can be obtained. Moreover, since both pieces 2 and 3 can be lowered from the pipe P after the bending is completed, the pipe P that has been bent can be easily removed from the bending device 1, allowing continuous automatic work.

Furthermore, when bending the pipe P into a serpentine shape, in the first embodiment described above, since the bending direction is only one direction, it is necessary to reverse the pipe P after the bending process and before the next bending process. In the case of this second embodiment, the pipe P can be moved by simply alternating the roles of rotation and revolution of both the pieces 2 and 3, that is, by causing the piece 3 to rotate and the piece 2 to revolve. Can be bent and formed into a serpentine shape.

FIG. 6 shows a modification of the second embodiment,
In this third embodiment, as shown in the figure, the tip of the large-diameter support portion 7 of the rotating top 2 and the tip of the protrusion 9 of the revolving top 3 always come into contact at point a during the bending process. In this way, the rotating top 3 is rotated on its own axis while revolving around the rotating top 2 with the bending center as an axis.

In the third embodiment, it is preferable to electrically control the rotation speeds of the rotating top 2 and the revolving top 3.
Further, the bending process in this embodiment is the same as that in the second embodiment described above, so a description thereof will be omitted.

According to this third embodiment, since the rotating piece 2 and the revolving piece 3 are always in contact with each other, it is possible to reliably prevent the pipe P from collapsing. Suitable for bending groove pipes.

Although the present invention has been described above with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments described above, and can be implemented as appropriate without changing the configurations set forth in the claims. For example, a larger number of pipes can be processed in parallel, or it can easily be applied to a continuous bending process.

<Effects of the Invention> In the present invention, a rotating top is rotatably provided at the bending center position of a pipe to be bent, and the rotating top has a distance from the center line to the outer line of the pipe set from the rotating axis. A small diameter part shorter than the distance to the outer surface is provided, and a large diameter support part whose distance from the center line to the outside line is approximately equal to the distance to the axis of the set pipe is provided, and the pipe is received in the large diameter support part. A groove was provided, and a revolving piece with the bending center of the pipe as its axis of revolution was arranged to be able to revolve around the rotating piece, and the revolving piece was provided with a holding groove corresponding to the receiving groove of the rotating piece. It is possible to reliably prevent the collapse of the pipe, and it becomes possible to bend ultra-thin pipes and pipes with complicated cross-sectional shapes, which ultimately makes it possible to improve the performance and reduce the weight of the heat exchanger. Further, according to the present invention, it is possible to automate the work of bending a finned pipe, and work efficiency can be greatly improved.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a schematic explanatory diagram, FIG. 2 is a perspective view of the main part, FIG. 3 is a process explanatory diagram of the bending work, and FIG. 4 is the main part of another embodiment. FIG. 5 is a process explanatory diagram of the bending operation in the same embodiment, and FIG. 6 is a plan view of the main parts of another embodiment. 1...Bending device, 2...Rotating top, 3...Revolving top,
4... Receiving groove, 5... Holding groove, 6... Small diameter part, 7... Large diameter support part.

Claims (1)

[Claims] 1. At the bending center position of the pipe to be bent,
A rotating top is provided to be able to rotate, and the rotating top is provided with a small diameter portion where the distance from the center line to the outer line is shorter than the distance from the rotating axis to the outer surface of the set pipe, and the distance from the center line to the outer line is provided. A large-diameter support part is provided that is approximately equal to the distance to the axis of the pipe set, and a receiving groove for the pipe is provided in the large-diameter support part. 1. A bending device for a finned pipe, characterized in that the revolving piece is provided with a holding groove corresponding to the receiving groove of the rotating piece. 2. A claim in which a protrusion along the axial direction is provided on the outer peripheral surface of the revolving top, and a holding groove is provided in the protrusion, and the rotating top and the revolving top are retractable in a direction perpendicular to the curved surface of the pipe. Item 1. The finned pipe bending device according to item 1.