JPH09254251A - Large bore synthetic resin pipe bending apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a bending apparatus having a portable compact structure and capable of simply subjecting a large bore synthetic resin pipe to bending processing on the spot in a simple structure. SOLUTION: A pair of upper and lower receiving molds 1, 2 each having such a form that a circular arc-shaped cylindrical body bent in a predetermined curvature is divided at the intermediate part of the inner and outer diameters thereof in a truncated state along its axial direction are arranged so that the opening parts of them are opposed to each other and the upper receiving mold 1 is fixed to a holder 3 and the lower receiving mold 2 is held to the holder so as to be movable toward the upper receiving mold. Further, the heaters 4 incorporated in the receiving molds 1, 2 to heat the molds to predetermined temp. and the pressure cylinder 5 pressing and moving the lower receiving mold 2 toward the upper receiving mold 2 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-diameter synthetic resin pipe bending apparatus mainly used for water and sewer pipes.

[0002]

2. Description of the Related Art In general, synthetic resin pipes for water and sewage systems which have a large diameter are those having a diameter of 75 mm or more, and large ones are sewage pipes having a diameter of 2000 mm or more. It is easy to bend such a large-diameter synthetic resin pipe to the desired size with a large-scale device installed in the factory in advance, but it is flexible to bend it according to the conditions of construction on site. This is a very difficult task because the pipe diameter is large.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention is to provide a bending device having a simple structure which can be easily carried on site and can easily bend a large-diameter synthetic resin pipe at a low cost with a simple structure. It is the main purpose.

[0004]

In order to achieve the above object, the present invention takes the following technical measures. That is, in the bending device of the present invention, a pair of upper and lower receiving molds having a shape in which an arc-shaped cylindrical body bent with a predetermined curvature is divided into half-cuts along the axial direction at an intermediate portion between the inner diameter and the outer diameter. 1, 2 are arranged with their openings facing each other, the upper receiving mold 1 is fixed to the holder 3, and the lower receiving mold 2 is held by the holder 3 so as to be movable toward the upper receiving mold. The receiving mold 1,
Heater 4 incorporated in 2 to heat the mold to a specified temperature
And a pressure cylinder 5 for pressing and moving the lower receiving mold 2 toward the upper receiving mold 2.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on an embodiment shown in the drawings. 1 to 3 show a bending apparatus according to the present invention, which includes a pair of upper and lower receiving molds 1, 2. The receiving molds 1 and 2 have a shape in which an arc-shaped cylindrical body bent with a predetermined curvature is divided into half-cuts along the axial direction at an intermediate portion between the inner diameter and the outer diameter, and the opening portions face each other. It is held by the holder 3 by means described later.

The holder 2 is formed so as to sandwich the upper and lower receiving molds 1 and 2 from the side surface, and the upper receiving mold 1 is fixed to the holder 3 by bolts 6. Further, the lower receiving mold 2 is provided with a slider 8 in a groove 7 formed on the inner surface of the adjacent holder.
It is slidably held via and can move toward the upper receiving mold 1. Then, it is configured to be driven by the pressure cylinder 5 and the plunger 10 which are operated by hydraulic pressure or atmospheric pressure. Further, a heater 4 is incorporated in the receiving molds 1 and 2 so that the receiving molds 1 and 2 can be heated to a predetermined temperature. A temperature controller 11 for controlling the temperature and heat generation time of the heater is provided so as to be connected to the terminal 4a of the heater.

In the above bending apparatus, as shown in FIG. 2, a synthetic resin tube 9 to be bent is inserted between the upper and lower receiving molds 1 and 2, and the receiving mold heater 4 is energized to have a temperature of 160 to 200 degrees Celsius.
Then, the lower receiving mold 2 is pushed upward by the pressure cylinder 5 to bend the synthetic resin pipe 9. in this case,
The bending rate of the synthetic resin pipe 9 is set by the moving amount of the plunger 10, that is, the pushing amount of the lower receiving mold 2. The temperature of the heater 4 is adjusted by the temperature controller 8 according to the thickness and diameter of the synthetic resin resin tube to be bent.

Although not shown, it is preferable that the cylinder 5 or the holder 3 be held by another underframe so that the posture of the bending device can be stably maintained. Alternatively, a leg stand or the like that holds the vertical posture may be attached.

Further, in the present invention, it is preferable that the upper and lower receiving molds 1 and 2 are detachable from the holder 3 so that they can be replaced with receiving molds of different sizes. Accordingly, if several types of receiving molds having different sizes are prepared in advance, it becomes possible to perform bending at a desired angle on site.

The large-diameter synthetic resin pipe bent by the bending apparatus of the present invention is not limited to the simple pipe-shaped pipe as shown in the above embodiment, but a large-diameter synthetic pipe having a joint portion at one or both ends of the pipe. Needless to say, this can also be implemented in a pipe joint.

The embodiments of the present invention have been described above.
The present invention is not limited to these examples, and it is possible to provide the constituent elements thereof, and achieve the object of the present invention, and appropriately modify and implement within the scope of the following effects. Of course.

[0012]

As described above in detail, according to the present invention, since the device is simple and compact, it is easy to carry,
There is a remarkable effect that a large-diameter synthetic resin pipe can be easily bent to a predetermined size at a work site, which is convenient, and the structure is simple, so that it can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing an embodiment of a bending device according to the present invention.

FIG. 2 is a side view showing the operation of the bending device.

FIG. 3 is a schematic cross-sectional view taken along the line AA of the bending device.

[Explanation of symbols] 1 Upper receiving mold 2 Lower receiving mold 3 Holder 4 Heater 5 Cylinder

Claims (1)

[Claims] 1. A pair of upper and lower receiving molds 1 and 2 having a shape in which an arcuate cylindrical body bent with a predetermined curvature is divided into half-cuts along an axial direction at an intermediate portion between an inner diameter and an outer diameter. The upper receiving mold 1 is fixed to the holder 3, the lower receiving mold 2 is held by the holder 3 so as to be movable toward the upper receiving mold. A large-diameter synthetic resin, comprising a heater 4 incorporated therein for heating the receiving mold to a predetermined temperature, and a pressure cylinder 5 for pressing and moving the lower receiving mold 2 toward the upper receiving mold 2. Pipe bending equipment.