JPH0429532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a synthetic resin corrugated tube having a cylindrical portion.

As a manufacturing method for synthetic resin corrugated pipes, a semi-molten tape-like material and a separately manufactured linear material are supplied around the outer circumference of a core metal, and the wound part is set as the axis center while being wound around the outer circumference of the core metal. Methods for moving in this direction are conventionally known. By the way, in order to connect the corrugated tube manufactured in this way to other equipment etc., as shown in FIG. It was necessary to screw in the connector 2 having the cylindrical part 2b for joining at the other end of the connector 2a. This is because this kind of corrugated pipe 1 has a spiral protruding part, so even if it is inserted into a connector and its outer circumference is tightened with a hose band, etc., a continuous spiral non-adhesive part will occur inside the pipe. It is. Therefore, an extra connector 2 is required, and it takes time and effort to assemble it, and the airtightness cannot be maintained unless adhesive is applied to the threaded part of the corrugated tube 1 and the connector 2. Moreover, when the corrugated tube 1 is made of polyethylene, There were problems such as lack of effective adhesive.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a method for manufacturing a synthetic resin corrugated pipe having a cylindrical part that can be integrally formed at an arbitrary position during manufacturing of the corrugated pipe. do.

For this reason, the present invention supplies a semi-molten tape material and a wire material to the outer periphery of a core metal, and while winding the material around the outer periphery of the core metal, moves the wound portion in the axial direction to form a corrugated tube. At a desired time, the linear material before being wrapped around the core metal is clamped with rollers, and this linear material is flattened and wound around the core metal to form a cylindrical portion at an arbitrary position. Provided is a method for manufacturing a synthetic resin corrugated pipe having the following properties.

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 2 shows a corrugated tube 10 manufactured by the manufacturing method according to the present invention, in which a cylindrical portion 12 is integrally formed at the end of the corrugated tube portion 11. This corrugated tube 10
According to the above, after fitting a hose band or the like around the outer periphery of the cylindrical part 12, inserting the cylindrical part 12 into a hose nipple (not shown) or the like of a connecting device and tightening the hose band, it can be made completely airtight. Can be connected.

An example of a method for manufacturing the corrugated tube 10 having such a cylindrical portion 12 will be explained with reference to FIGS. 3 to 7.
Reference numeral 13 denotes a core metal, in which a large number of cylindrical rotors 15 are attached to the outer peripheral surface of a rotatable support shaft 14 by a holding member 16 at a constant twist angle with respect to the axial direction of the support shaft 14. They are arranged in a plurality of rows, and either the rotor 15 or the spindle 14 is made of a magnet, and the spindle 14 is configured to be rotated by a rotation drive device 17. Reference numeral 18 denotes a synthetic resin material supplying device disposed on one side of this core metal 13, which feeds a semi-molten tape-like material 20 and wire from a die 19 at its tip, as shown in FIGS. 5 and 6. The shaped material 21 is continuously supplied toward the outer periphery of the core metal 13.

22a and 22b are linear materials 21 between the supply device 18 and the core bar 13, as shown in FIGS. 3 and 5.
These are a pair of rotating rollers disposed above and below the passage path, and are configured to be movable up and down between a clamping position where the linear material 21 is clamped and flattened and a standby position spaced apart vertically, and at least When it is in the clamping position, it is configured to rotate at a peripheral speed equal to the feeding speed of the linear material 21 by a drive device not shown.

In such a configuration, the tape-like material 20 and the linear material 21 supplied from the supply device 18 are supplied onto the rotors 15 on the outer periphery of the core metal 13, and are applied to each rotor 15 that rotates due to the rotation of the support shaft 14. Therefore, as the supplied material is wound in a spiral, the wound portion is successively moved in the axial direction of the core metal 13, and as shown in FIG. A corrugated tube portion 11 is formed. After forming the corrugated tube portion 11 to the required length,
When forming the cylindrical portion 12, the rollers 22a and 22b are moved toward the clamping position as shown by the arrows in FIG. 5, and as shown in FIG. is pressed and crushed together with the tape-like material 20 to form a flat band-like body 21a and the core metal 13
The cylindrical portion 12 is formed by winding the material around the material. After forming the cylindrical portion 12 of the required length, the corrugated tube portion 11 is formed by moving the rollers 22a and 22b back to the standby position. Therefore, by positioning the rollers 22a and 22b in the clamping position for a certain period of time at certain time intervals, it is possible to continuously manufacture a tube having a predetermined length of corrugated pipe portions 11 and cylindrical portions 12 alternately. By cutting at appropriate positions, it is possible to obtain a corrugated tube 10 having a cylindrical portion 12 for connection at the end, as shown in FIG. By making the width of the strip 21a formed by pinching the linear material 21 equal to the feeding pitch of the core metal 13, a completely smooth cylindrical portion 12 can be formed. Further, the rollers 22a, 2
Although two pairs of 2b are provided in the illustrated example, only one pair may be provided if the flattening can be achieved sufficiently with one clamping pressure.
On the other hand, three or more pairs may be provided and gradually flattened so that the thickness becomes uniform in the width direction. However, when the number of rollers is increased, the material cools and the tape-like material 20
In some cases, the integration may be insufficient.

In the above embodiment, by supplying the linear material 21 from a position below the tape-like material 20 as shown in FIG. 6, the linear material 21 is exposed to the inner wall surface of the pipe as shown in FIG. Although the case of forming the section 11 is shown, even when forming a similar corrugated tube section 11, a die is used in which the linear material 21 is integrated and supplied on the lower surface of the tape-like material 20, as shown in FIG. 1
9a, or a die 19b in which the linear material 21 is positioned above the tape-like material 20 in the material feeding direction and fed as shown in FIG. 9, or the like may be used.

In addition, as shown in FIG. 9, when feeding the linear material 21 at a side position of the tape-like material 20, as shown in FIG. What is necessary is just to configure it so that it can hold and press. Further, FIG. 10 shows an embodiment using different types of core metals.

In FIG. 10, the rotor 15 of the above embodiment is shown.
Instead of the fixed core metal 13 using It is configured to be connected sequentially at one end in the axial direction, disassembled sequentially at the other end in the axial direction, and circulated to the one end. Further, the connecting portion 23a of each core metal 23 is configured to connect the core metals 23 concentrically and to transmit forces in the axial direction and rotational direction. Even when such a core metal 23 is used, the method of forming the corrugated tube portion 11 and the cylindrical portion 12 is the same as described above.

Furthermore, when the corrugated tube portion 11 is configured such that the linear material 21 is in a sandwich state between the tape-like materials 20 as shown in FIG. 11, or is exposed on the outer wall surface of the tube, as shown in FIG. The die 19c is designed to feed the linear material 21 from above the tape-like material 20, and the tape-like material 2 is supplied from the die 19c as shown in FIG.
As shown in FIG. 14, the die 19d is configured to integrally supply the linear material 21 on the upper surface of the tape-shaped material 20, and the linear material 21 is provided at a position downstream from the tape-shaped material 20 in the material feeding direction. The cylindrical portion 12 can be formed by using a die 19e or the like having a similar shape, and the formation of the cylindrical portion 12 in this case is also the same as described above.

According to the method of manufacturing a corrugated tube having a cylindrical portion of the present invention, as is clear from the above description, the linear material before being wrapped around the core metal is clamped and flattened with rollers during the manufacture of the corrugated tube. A cylindrical part can be formed by this simple method, and since it does not affect the core metal in any way, there is no risk of wear or deformation of the core metal, especially when forming a cylindrical part with a rotor on the outer periphery. The effect on money is significant. In this way, it is possible to easily obtain a corrugated tube having an integral cylindrical portion without requiring any extra parts or processing effort at the connecting portion as in the conventional art, and without causing problems in airtightness.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional view showing a connecting cylindrical part of a conventional corrugated pipe, Figs. 2 to 7 show an embodiment of the present invention, and Fig. 2 shows a cylindrical part of a manufactured corrugated pipe. A front view, FIG. 3 is a plan view showing the manufacturing process of the corrugated tube part, and FIG. 4 is a plan view showing the manufacturing process of the cylindrical part.
Fig. 5 is a side view taken along line A-A in Fig. 3, Fig. 6 is a front view of the die of the material supply device as seen from line B-B in Fig. 3, and Fig. 7 is a longitudinal section of the corrugated pipe section. 8 and 9 are a front view similar to FIG. 6 showing the shape of a die for manufacturing the same corrugated tube section, FIG. 10 is a plan view of another embodiment, and FIG. 11 is a corrugated tube section. FIGS. 12 to 14 are longitudinal cross-sectional views showing other structural examples, and are front views similar to FIG. 6 showing the shape of a die for manufacturing the same corrugated tube section. 10 is a corrugated tube, 11 is a corrugated tube portion, 12 is a cylindrical portion, 13 and 23 are metal cores, 14 is a supply device, 20 is a tape-shaped material, 21 is a linear material, 22a, 22b
is Laura.

Claims (1)

[Claims] 1. Supply semi-molten tape material and wire material to the outer periphery of the core metal, and while winding the material around the core metal, move the wound part in the axial direction to form a corrugated tube, and at any time. It has a cylindrical part characterized in that the linear material before being wrapped around the core metal is clamped with rollers, the linear material is flattened and wound around the core metal to form a cylindrical part at an arbitrary location. A method for manufacturing corrugated synthetic resin pipes.