JPH0237457Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a finned pipe bending device that can bend a pipe provided with a plurality of fins used in a heat exchanger such as an evaporator.

<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.

<Means for solving the problem> The present invention was proposed in view of the above, and includes a sliding part that is slidably supported by a base part, and a bending jig that is installed on the sliding part so that the diameter can be reduced. and a mandrel that can be fitted into the bending jig, and the bending jig consists of a plurality of jig pieces divided in the radial direction, and each jig piece is arranged in a direction perpendicular to the sliding direction of the slide part. During the pipe bending process, a mandrel is inserted between each jig piece to expand the diameter of the bending jig, and once the bending process is completed, the mandrel is retreated from the bending jig and each The diameter of the bending jig is reduced by sliding the jig piece, and the bending jig is removed from the bent portion of the pipe by sliding the sliding part.

<Operation> The diameter of the bending jig can be reduced by pulling out the mandrel from the bending jig that can be divided into a plurality of jig pieces, and the bent pipe can be separated from the diameter-reduced bending jig.

<Embodiments> The present invention will be described below with reference to embodiments of the drawings.

A bending device 1 according to the present invention includes a slide portion 2 that is slidably supported by a base portion (not shown), and a bending jig 3 that is installed on the slide portion 2 so that its diameter can be reduced.
and a mandrel 4 that can be fitted into the bending jig 3.

The slide section 2 is provided with a slide device 6 that operates using hydraulic pressure, pneumatic pressure, a motor, or the like as a drive source 5, and the operation of the slide device 6 causes the slide section 2 to slide vertically relative to the base section. Further, a flange portion 7 is provided at the upper end of the slide portion 2, and a slide hole 8 is provided that passes through the slide portion 2 in the vertical direction.

A bending jig 3 is installed on the upper surface of the flange 7 so as to be able to reduce its diameter. The bending jig 3 consists of left and right jig pieces 9, which are divided into two in the radial direction. The left and right jig pieces 9, which are divided into two parts, are each provided with a dividing device 11 having a driving source 10 such as hydraulic pressure, pneumatic pressure, or a motor. Each of the jig pieces 9, 9 slides in a direction perpendicular to the sliding direction of the slide portion 2 by the operation of the dividing device 1, thereby expanding or contracting the diameter of the bending jig 3.
In addition, the bending jig 3 has a substantially inverted U-shape having a semicircular top 12 and a flat part 13 following the top 12 in a plan view, and has a pipe groove 14 on the outer peripheral surface into which the pipe P can be fitted. have. According to the illustrated embodiment, the pipe grooves 14 are provided in two stages, upper and lower.

A recess 16 is provided in the opposing surface 15 of each jig piece 9, 9, and the recess 16 and the sliding hole 8 of the slide portion 2
A mandrel 4 is inserted in series.

The mandrel 4 is provided with a fitting device 18 using a drive source 17 such as hydraulic pressure, pneumatic pressure, or a motor to slide the mandrel 4 in the same direction as the slide portion 2, that is, in the vertical direction.

Furthermore, a pair of rollers 19, 19 are provided on the outer circumferential surface 12' of the top portion 12 of the bending jig 3, which rotate approximately 90 degrees each while facing the outer circumferential surface 12'.

The finned pipe bending device 1 of the present invention constructed as described above bends, for example, a finned pipe P as shown in FIG. 8 in the following manner.

First, the dividing device 11 is operated to separate the jig pieces 9, 9.
The bending jig 3 is opened to the left and right, and the insertion device 18 is operated to fit the mandrel 4 into the recess 16.
Expand the diameter of the pipe P and insert it into the pipe groove 14 of the bending jig 3.
(state shown in Fig. 9), a pair of rollers 19,
19 is rotated along the outer peripheral surface of the bending jig 3, and the pipe P is pressed by a pair of rollers 19, 19 to bend it along the outer peripheral surface of the bending jig 3 (Figs. 1 and 2).
condition).

When the bending step is completed, the pipe P is pushed out slightly in the convex direction of the bent portion P', and the pipe P is removed from the pipe groove 14 in the top 12 portion of the bending jig 3.
In addition, in this state, the pipe groove 14 of the flat part 13 is still
The pipe P is fitted into the (state shown in Fig. 3).

Next, the inserting device 18 is operated to lower the mandrel 4 beyond the flange 7 of the slide section 2, and the dividing device 11 is operated to bring the facing surface 15 into close contact with each jig piece 9, thereby forming the bending jig. 3 and remove the fitting between the pipe P and the pipe groove 14 (Fig. 4,
(Situation shown in Figure 5).

Then, the slide device 6 is operated to move the slide portion 2 downward, and the bending jig 3 is moved to the pipe P.
Pull it out from the bent part P' (states shown in Figures 6 and 7). In this state, the pair of rollers 19, 19
has returned to its original position.

As described above, according to the present invention, even if the pipe P has fins F, after the bending process is completed,
When the bending jig 3 is removed, the fins F are not locked to the bending jig 3, so the pipe P can be easily pulled out from the bending jig 3.

Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to the above-mentioned embodiments, and can be implemented in any manner as long as the structure described in the claims for utility model registration is not changed. For example, it is possible to increase the number of pipe grooves in the bending jig to bend even more pipes at the same time, or by arranging the bending jig and a pair of rollers in alternate directions,
It is also possible to form a meandering finned pipe in one step by moving these jigs and rollers in cooperation with each other in the vertical and horizontal directions. Furthermore, the configurations and driving means of the slide device 6, the dividing device 11, and the insertable device 18 can be selected as appropriate.

<Effects of the invention> The present invention comprises a slide part that is slidably supported by a base part, a bending jig that is installed on the slide part so that its diameter can be reduced, and a mandrel that can be fitted into the bending jig. When the bending process of the pipe is completed, the mandrel is moved back from the bending jig to reduce the diameter of the bending jig, and the sliding part is slid, so the bending jig can be easily removed from the bending part of the pipe. be able to. Therefore, according to the present invention,
It becomes possible to automate the work of bending finned pipes, greatly improving work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway schematic front view of the pipe after the bending process is completed, Fig. 2 is a schematic plan view of the same, and Fig. 3 shows the pipe bent. Fig. 4 is a schematic plan view with the mandrel pulled out from the bending jig and the diameter of the bending jig is reduced, and Fig. 5 is the same as above. A schematic plan view, FIG. 6 is a partially cutaway schematic front view of the bending jig removed from the bent part of the pipe, FIG. 7 is a schematic plan view of the same as above, and FIG. 8 is a perspective view of the finned pipe. 9 are schematic plan views of the finned pipe set in the bending device. DESCRIPTION OF SYMBOLS 1... Bending device, 2... Slide part, 3... Bending jig, 4... Mandrel, 9... Jig piece.

Claims (1)

[Scope of utility model registration request] It has a slide part that is slidably supported by the base part, a bending jig that is installed on the slide part so that the diameter can be reduced, and a mandrel that can be fitted into the bending jig, and the bending jig has a diameter Consisting of a plurality of jig pieces divided in the direction, each jig piece is slidable in a direction perpendicular to the sliding direction of the sliding part, and a mandrel is inserted between each jig piece during the pipe bending process. When the bending jig is completed, the mandrel is moved back from the bending jig, each jig piece is slid to reduce the diameter of the bending jig, and the sliding part is slid. A bending device for a pipe with fins, characterized in that a bending jig is removed from a bent portion of the pipe.