JP2898902B2 - Auxiliary equipment for pipe bender - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary device for a pipe bender (hereinafter simply referred to as an auxiliary device). More specifically, the present invention relates to an auxiliary device used for bending a pipe (pipe) used for industrial piping such as an air conditioning refrigerant pipe and a hot / cold water pipe.

[0002]

2. Description of the Related Art Conventionally, bending of large diameter pipes (diameter of 19 mm or more) such as copper pipes as pipes used in industrial pipes has been performed using a pipe bender installed in a factory. . In bending, an auxiliary device is used to prevent wrinkles and flattening in a bent portion of the pipe. As this auxiliary device, there is a type in which a solid mandrel made of urethane or nylon is inserted into a pipe, or a type in which a ball made of steel or synthetic resin is inserted into a pipe.

[0003]

However, the auxiliary device using the above-mentioned solid mandrel, after bending the pipe, forcibly presses the solid mandrel tightly fastened to the bent portion of the pipe. Since the solid mandrel is pulled out by a mandrel drawing device or the like, the solid mandrel is significantly worn. For example, a urethane mandrel is disposable 5 to 6 times, and a nylon mandrel is 100 to 5 times.
There is a problem that it cannot be used after 00 times. Further, in the auxiliary device using the ball, a method in which the ball in the pipe is moved in accordance with the stretching of the pipe in the bending portion to perform the bending process, and a method in which the number of balls is increased to bend without moving the ball. However, in each case, there is a problem that the structure is complicated and auxiliary equipment is significantly consumed. Further, there is a problem that such an auxiliary device using a solid mandrel or a ball is limited to installation in a factory.

[0004] In view of the circumstances described above, the present invention can be used not only for a factory-installed type but also for a movable vendor, and it is possible to obtain a bent part having excellent durability and high precision. The purpose is to provide assistive devices.

[0005]

An auxiliary device according to the present invention is an auxiliary device used for a bender for bending a pipe. The auxiliary device includes an inflatable body inserted into the pipe, and an inflatable body for expanding and contracting the inflatable body. an expansion means, Ri Do and a power transmission means for connecting the said inflatable body said expansion means, said expansion body
A hollow mandrel, wherein the mandrel is
Layers, outer layers, and supplements interposed between the inner and outer layers.
Is characterized in Rukoto such is the multilayer structure of strong layer.

[0006] An auxiliary device used for a bender for bending a pipe, comprising a hollow mandrel inserted into the pipe, a pressurizing pump for enclosing a pressure medium inside the mandrel, and a pump. disposed between the said mandrel and pressure pump, Ri Do a connecting pipe for transporting a pressurized medium, wherein the mandrel, the inner layer, outer layer, and
Multilayer consisting of reinforcing layers interposed between inner and outer layers
Is characterized in Rukoto such is the structure.

[0007]

According to the present invention, a hollow mandrel is inserted into a pipe, and then a pressure medium is sealed in the mandrel and expanded in the pipe. After that, the pipe is bent around the mandrel. After completing this pipe bending process,
Shrink the mandrel and pull it out of the pipe. Thus, the mandrel is not worn when the mandrel is pulled out.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an auxiliary device according to the present invention.

FIG. 1 is a partially cutaway external view showing an embodiment of the assisting device of the present invention, FIG. 2 is a partially cutaway enlarged view of the mandrel in FIG. 1, and FIG. FIG.

As shown in FIGS. 1 to 3, the auxiliary device 1
Is an expansion body A inserted into the pipe P, expansion means B for expanding and contracting the expansion body A, and expansion means B
When the pressure medium 2 of the expansion means B is pressurized and sealed in the expansion body A, which is composed of the power transmission means C connecting the expansion body A to the power transmission means C, the expansion body A has a pressure of 1 to 300 kgf.
/ Cm ² , and a hollow mandrel 3 that returns to its original shape when decompressed can be used. As shown in FIG. 2, the mandrel 3 includes an inner layer 4, an outer layer 5, and a reinforcing layer 6 interposed between the inner layer 4 and the outer layer 5 or embedded in the inner layer 4. As the pressure medium 2, water, mineral oil, vegetable oil, hydraulic synthetic oil such as synthetic oil, air, etc. are used as the pressure medium 2, but safety, economy, versatility and durability of the inner layer of the flexible mandrel are used. It is preferable to use water or hydraulic oil for its properties. The material of the inner layer 3 can be appropriately selected from rubber or synthetic resin having water resistance, oil resistance, and air resistance according to the type of the pressure medium 2 to be enclosed.
Although not particularly limited in the present invention, examples of the rubber include natural rubber (NR), synthetic natural rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR), and nitrile-butadiene rubber (NB).
R), hydrogenated nitrile-butadiene rubber (H-NB
R), butyl rubber (IIR), chlorinated butyl rubber (CL
-IIR), brominated butyl rubber (Br-IIR), ethylene propylene rubber (EPM), ethylene propylene diene methylene rubber (EPDM), chloroprene rubber (CR), chlorosulfonated rubber (CSM), urethane rubber (U ), Fluorine rubber (FKM), silicon rubber, etc., and as the synthetic resin, urethane elastomer, styrene elastomer, vinyl chloride elastomer, olefin elastomer, polyester elastomer, polyamide elastomer, etc. be able to. The material of the outer layer 5 is similarly
It can be appropriately selected from rubber or synthetic resin having excellent wear resistance, oil resistance, weather resistance, and the like. Specific examples of such rubber and synthetic resin include those similar to the inner layer. The outer layer 5 includes MoS ₂ , Si
By impregnating, kneading or reacting with oil, Teflon-based powder, ceramic powder, or the like, it is possible to improve the removability. The reinforcing layer 6 is made of a fiber such as rayon, cotton, nylon, vinylon, polyester, or aramid, or a steel wire such as a piano wire or a stainless wire, and is formed by directly knitting a bag, spiral, or knit. The inner layer 4 is made by braiding with a braider or covering the inner layer 4 with a woven fabric in advance.

As the expansion means B, a pressure pump 7 can be used. The pressurizing pump 7 is a manual pump, an electric pump, a pneumatic pump, or the like. For example, a plunger pump, a vane pump, a gear pump, a diaphragm pump, or the like can be used. When using water pressure, it can be used by directly connecting to a water supply pipe.

As the power transmission means C, a connecting pipe 8 can be used. This connecting pipe 8 has a withstand pressure of 1 to 3.
It has a water resistance, oil resistance and air resistance of about 00 kgf / cm ² , and is a flexible pipe such as a rubber hose, a synthetic resin hose, a metal flexible pipe, or a rigid pipe such as a metal pipe. It is preferable to use a rubber hose, a synthetic resin hose or a flexible tube. The material of the rubber hose and the material of the synthetic resin hose may be the same as the material of the inner layer 3, and the rubber hose and the synthetic resin hose may be made of rayon, cotton, nylon, vinylon, polyester, aramid, piano wire, Reinforced with stainless wire, soft wire, etc. The connection pipe 8 and the mandrel 3 are connected by a fastening portion 9. The fastening portion 9 includes a sleeve 10 inserted into the inner layer 4 of the mandrel 3 and a first caulking member 1 caulked to the outer layer 5.
1 and a nut portion 12 screwed to one end of the sleeve 10
And a second caulking member 14 for caulking the connecting pipe 8 fitted into the flange 13 of the nut portion 12. The connecting pipe 8 and the pressurizing pump 7 are
Are connected by the caulking member 15. The connection between the connecting pipe 8 and the mandrel 3 and the pressurizing pump 7 is not limited to the fastening portion 9 and the third caulking member 15, but may be, for example, a screw type coupling or a fitting quick cup. It can be performed by a ring or the like.

Next, an example of use of the auxiliary device of the present invention will be described.

As shown in FIG. 3, the pipe bender includes a drive roll 21, a slide die 22 for guiding the sliding of the pipe P, and a chuck die 23 for rotating around the outer periphery of the drive roll 21 with the pipe P fixed. What is equipped with is used. Then, the outer peripheral surface 2 of the driving roll 21
1a, side surface 2 of slide mold 22 and chuck mold 23
A curvature surface substantially equal to the curvature surface of the pipe P is formed in 2a and 23a. Reference numeral 24 denotes a parallel die attached to a corner part of the drive roll 21 which is partially cut away.

First, as shown in FIG. 3, a pipe P is inserted between the drive roll 21 and the slide mold 22 and the chuck mold 23, and then the slide mold 22 and the chuck mold 23 are inserted.
To the drive roll 21 side to pinch the pipe P.
Then, after inserting the mandrel 3 of the auxiliary device 1 shown in FIG. 1 from one end of the pipe P to the position of the bent portion,
The pressure medium 2 is sealed under pressure in the mandrel 3, and the mandrel 3 is expanded in the pipe P. Next, the chuck die 23 is turned while rotating the drive roll 21.
Thereby, the pipe P extends while sliding, and is bent along the outer periphery of the drive roll 21. When the bending of the pipe is completed, the pressure medium 2 in the mandrel 3 is discharged, the mandrel 3 is returned to the original size and shape, and then the mandrel 3 is pulled out of the pipe P.

[0016]

As described above, according to the present invention, in bending a pipe, a mandrel is inserted, expanded at a bent portion, and after the bending process, the mandrel is contracted and pulled out. Almost gone, about 5-5 in conventional solid mandrel
Although it can not be used within 00 times,
It can be used more than 100,000 times, is excellent in durability, and can reduce the cost.

Further, since the mandrel can be easily pulled out by manpower, a special drawing device as in the prior art is not required, so that the installation space of the device can be effectively utilized and the cost of the device can be reduced. Reduction can be achieved.

Further, since the auxiliary device of the present invention can be easily transported, it can be used not only for a factory installation bender but also for a movable type easy-to-cylinder bender, which enables pipe bending at a construction site and improves workability. I do.

Further, since the mandrel of the present invention has flexibility, it is possible to continuously perform a two-dimensional bending process and a three-dimensional bending process on, for example, a 4 m fixed length tube.

Further, by using the auxiliary device of the present invention, wrinkles and flatness are reduced in the bent portion of the pipe, and abrasion is not generated on the inner surface of the pipe. A curved tube can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway external view showing one embodiment of an auxiliary device of the present invention.

FIG. 2 is a partially cutaway enlarged view of a mandrel in FIG. 1;

FIG. 3 is an explanatory view showing an example of use of the auxiliary device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Auxiliary equipment 2 Pressure medium 3 Mandrel 7 Pressurizing pump 8 Connecting pipe

Claims (7)

(57) [Claims] An auxiliary device used for a bender for bending a pipe, comprising: an inflatable body inserted into the pipe;
Expansion means for expanding and contracting the expansion body, and power transmission means connecting the expansion means and the expansion body.
The inflatable body is a hollow-shaped mandrel;
The drell is the inner layer, the outer layer, and the inner layer
Pipe bender auxiliary instrument according to claim Rukoto such is the multi-layer structure comprising a reinforcing layer interposed. 2. An auxiliary device used for a bender for bending a pipe, comprising: a hollow mandrel inserted into the pipe; a pressurizing pump for enclosing a pressure medium inside the mandrel; disposed between the and the pressurizing pump said mandrel, Ri Do a connecting pipe for transporting a pressurized medium, wherein the mandrel, the inner layer, outer layer, and an inner layer
Structure consisting of a reinforcing layer interposed between the outer layer and the outer layer
Pipe bender auxiliary instrument according to claim Rukoto such been. 3. The auxiliary device according to claim 2, wherein the pressure medium is a fluid. 4. The auxiliary device according to claim 2, wherein the connecting pipe is a rigid pipe. 5. The auxiliary device according to claim 2, wherein the connecting tube is a flexible tube. 6. The method of claim 1, wherein the multilayer structure comprises an inner layer, an outer layer, and an inner layer.
Multi-layer structure consisting of reinforcing layers interposed between layers and outer layers
Instead of the inner layer, the outer layer, and the supplements embedded in the inner layer.
3. The auxiliary device according to claim 1 , wherein the auxiliary device comprises a strong layer . 7. The stretchable rubber according to claim 1, wherein the inner layer and the outer layer are elastic.
7. The auxiliary device according to claim 6, which is made of a synthetic resin .