JP3358218B2 - Corrugated pipe manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a corrugated pipe made of synthetic resin having a sufficient flat strength by forming a pipe wall surface into a corrugated cross section, and particularly to an apparatus for manufacturing a corrugated pipe having high molding stability. About.

[0002]

2. Description of the Related Art Conventionally, as a corrugated pipe manufacturing apparatus of this type, for example, as shown in FIGS. 2 and 3, a plurality of corrugated pipes are formed along a virtual circumference between opposing support frames 2 and support plates 4. Rollers 3a, 3b,..., 3i that are rotatably disposed to form substantially one rotating shaft body;
A corrugated pipe manufacturing apparatus is known which has a plurality of corrugated rings 12, 12,... arranged on the peripheral surface of a, 3 b,.
2-60261).

[0003] In manufacturing a corrugated pipe performed by these devices, a synthetic resin strip A is extruded from an extruder 24, and the strip A is rotated by the rotating shaft and the respective rollers 3 driven by a motor 16. This is performed by spirally advancing and winding around the outer periphery of the rotating shaft body, and overlapping and fusing with the previously extruded belt-like body one round before.
Further, irregularities are formed on the peripheral surface of the tube by the convex shape of the wave ring 12 and the outer periphery of the roller.

In the drawing, reference numeral 1 denotes a base of the apparatus, 5 denotes a base shaft which is disposed between the support frame 2 and the support plate 4 and supports the support plate 4, and 6 and 7 are provided at both ends of the shaft of the roller 3. Shafts which are arranged and penetrate through the support frame 2 and the support plate 4 to make the roller 3 rotatable, 16 is a motor as a driving source of the roller 3, 17 is a reduction gear, 18 and 21 are sprockets, 19 and 22 is a chain, 20 is a shaft, and 23 is a tension device.

Since the roller 3 is rotated at a uniform speed by the chain 22, the belt A is wound around the rotating shaft at a uniform speed.

[0006]

However, looking at the peripheral speed of each roller alone, the peripheral speed of the roller is 55 to 90% of the peripheral speed at the top of the wave ring due to the difference in diameter. Therefore, there has been a problem that a vertical wrinkle (internal distortion) is generated between a peak (wave ring pressure contact portion) and a valley (roller pressure contact portion) of the formed corrugated pipe. In addition, there is a problem that the corrugated pipe having the vertical wrinkles has low durability such as impact resistance and pressure resistance.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems in the conventional manufacturing apparatus, and has a high durability such as impact resistance and pressure resistance, and a crest of a corrugated pipe manufactured. An object of the present invention is to provide a corrugated pipe manufacturing apparatus in which vertical wrinkles (internal distortion) do not occur between the corrugated pipe and the valley.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above, and is provided with a plurality of members rotatably disposed along an imaginary circumference between opposing support frames and support plates. A roller forming two rotating shafts, a plurality of wavy rings provided on the peripheral surface of the roller and having a helical cross-section, and a molten synthetic resin strip provided near the support frame. An apparatus for manufacturing a corrugated pipe having an extruder for extruding, wherein a body ring driven by an outer periphery of a roller between the wave rings is provided.

In the present invention, the body ring is disposed so as to be driven and rotatable around the outer periphery of the roller via a bearing, and covers the roller between the wave rings. Here, the strip advances while contacting the wave ring and the body ring. However, since the trunk ring is driven, the strip advances according to the peripheral speed of the wave ring. Therefore, by adopting the trunk ring,
It is not affected by the peripheral speed of the roller, which is 55 to 90% of the peripheral speed at the top of the wave ring.

According to the present invention, there is provided an apparatus in which a presser roll for fixing the shape from outside the virtual cylinder is added, and further, a smooth roll is provided inside the corrugated pipe in order to manufacture a two-layer corrugated pipe. It is needless to say that the present invention can be applied to an apparatus constituting a synthetic resin pipe forming apparatus.

[0011]

According to the present invention, a molten synthetic resin strip is extruded against a corrugated ring having a plurality of helical cross-sections which are arranged on a peripheral surface of a roller arranged along a virtual circumference. In a corrugated pipe manufacturing apparatus for manufacturing a corrugated pipe by winding, a trunk ring driven by an outer periphery of a roller between the corrugated rings is disposed, and thereby the strip is advanced at a substantially uniform speed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view schematically showing a roller, a wave ring, and a body ring, which are characteristic parts of one embodiment of a corrugated pipe manufacturing apparatus according to the present invention.

The roller 3 which is a feature of the present embodiment is a tubular shaft, and a body ring 8 and a wave ring 12 are arranged on the outer periphery of the roller 3 every other. Here, the body ring 8 is rotatably disposed between the roller 3 via a tubular dry bearing 9 and a positioning tool 10.
2 is fixed via a fixture 11. The hollow portion 31 of the roller 3 is provided for cooling and solidifying a corrugated pipe formed through cooling water supplied from a cooling water supply device (not shown).

Here, the operation when the configuration of FIG. 1 is applied to the above-described conventional apparatus will be described with reference to FIGS. 2 and 3 where it is assumed that the illustration of the body ring 8 is omitted.

The molten synthetic resin strip A extruded from the extruder 24 is passed through a guide roller 26 to form a wave ring 1.
The rollers 3a, 3b,..., 3i are rotated by the motor 16 at the same time as the supply speed of the strip A. By the above two actions, the tip of the band-shaped body A spirally moves on the outer circumference of the wave ring 12 and the body ring 8. When the belt-shaped body A further advances, the entire roller advances spirally. When the belt-shaped body A is wound one round, the belt-shaped body A extruded later partially overlaps with the belt-shaped body A one round before, and the belt-shaped body A A is formed in a tubular shape as a whole. On the other hand, the belt-like body A formed in a tubular shape has its outer peripheral unevenness adjusted by the pressing of the pressing roller 25 from the outside, and is cooled and solidified by cooling water passing through the hollow portion 31 or an ambient temperature.

The progress of the band A during the above operation is as follows.
As shown in FIG. 3, the driving of the motor 16 is controlled by the rollers 3a, 3b,.
The rotation proceeds by the rotation of itself and the rotation of a rotating shaft composed of an assembly of the rollers 3a, 3b,. However,
The wave ring 12 and the body ring 8 are in direct contact with each other. Since the body ring 8 is a driven roller, the belt-shaped body A advances at the peripheral speed of the wave ring 12.

In this embodiment, since the roller surface is covered with the wave ring and the body ring and the body ring is driven, there is an effect that the traveling speed of the synthetic resin strip traveling on the outer periphery is not generated. And the pitch of the wave ring can be easily adjusted by selecting the body ring.

[0018]

According to the present invention, both shaft ends of a plurality of rollers arranged along an imaginary circumference so as to form a substantially rotating shaft are rotatably mounted on the support frame and the support plate. A corrugated pipe having a shaft bearing, a plurality of corrugated rings arranged on the peripheral surface of the roller and having a helical cross section as a whole, and an extruder disposed near the support frame and extruding a molten synthetic resin strip. In the manufacturing apparatus, a body ring driven by the outer periphery of the roller between the wave rings is disposed, thereby having high durability such as impact resistance and pressure resistance, and the crests and valleys of the manufactured corrugated pipe. This has the effect that vertical wrinkles (internal distortion) do not occur between them.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a roller, a corrugated ring, and a body ring, which are characteristic parts of an embodiment of a corrugated pipe manufacturing apparatus according to the present invention, by extracting them.

FIG. 2 is a plan view schematically showing the present embodiment and a conventional corrugated pipe manufacturing apparatus.

FIG. 3 is a left side view of the manufacturing apparatus of FIG. 2;

[Explanation of symbols]

 2 Support frame 3 Roller 4 Support plate 9 Body ring 12 Wave ring 24 Extruder A Synthetic resin strip

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 53/58 B29C 53/82 B29D 23/00

Claims (1)

(57) [Claims] A roller which is rotatably arranged along a virtual circumference between opposing support frames (2) and support plates (4) to substantially form one rotating shaft. (3)
And a plurality of wave rings (12, 12,...) Having a helical cross-section and arranged on the peripheral surface of the roller (3).
And a corrugated pipe manufacturing apparatus having an extruder (24) disposed near the support frame (2) and extruding a molten synthetic resin strip, wherein an outer periphery of a roller (3) between the corrugated rings (12) is provided. An apparatus for manufacturing a corrugated pipe, comprising a body ring (9) driven by a corrugated pipe.