JP6924249B2 - Double resin pipe and its manufacturing method - Google Patents

Description

The present invention relates to a double resin tube used as a winding core or the like around which a film-shaped member or a sheet-shaped member is wound.

In the manufacturing process of long materials such as film-shaped members and sheet-shaped members, generally, the winding core of a winder in which the manufactured long materials are installed at the most downstream for storage and transportation of the long materials after manufacturing. It is wound around (also called a "core"), and the core is often made of resin (including at least a part made of fiber reinforced plastic, that is, FRP).

As the winding core as described above, there is a double core, that is, a double resin tube in which an outer tube is provided coaxially with the inner tube with a predetermined radial gap on the outer side in the radial direction of the inner tube (for example). , Patent Document 1). In the winding core made of this double resin tube, the inner tube can be attached to the chuck portion of the existing winding machine, so that it can be used as it is in place of the conventional winding core, and the outer tube can be used as it is. By making the diameter larger than the outer diameter of the conventional winding core, it is possible to prevent the winding habit of a long material that tends to occur in the conventional small diameter winding core.

Jitsufuku 4-8140 Gazette

By the way, in the winding core of Patent Document 1, side plates are provided between the inner peripheral surface of the end portion of the outer pipe and the outer peripheral surface of the end portion of the inner pipe at both ends in the axial direction, and the outer pipe and the side plate are provided. Is adhesively fixed with an adhesive or the like, and although it is not specified, it is considered that the side plate and the inner pipe are also adhesively fixed. Therefore, when winding a long lumber, the rotational torque applied to the inner pipe from the chuck portion of the winder causes the adhesive to peel off between the inner pipe and the side plate or between the side plate and the outer pipe. As a result, the inner pipe may slip (alone or integrally with the side plate), causing a problem that the long material cannot be wound.

Therefore, it is an object of the present invention to provide a double resin pipe in which the inner pipe and the outer pipe are firmly fixed and relative rotation does not occur even with a load of rotational torque, and a method for manufacturing the double resin pipe.

In order to solve the above problems, the double resin pipe of the present invention includes an inner pipe made of resin and a resin outer pipe arranged coaxially with the inner pipe on the radial outer side of the inner pipe. In a double resin pipe in which the inner pipe and the outer pipe are fixed at both ends in the axial direction, the end portion of the inner pipe and the end portion of the outer pipe are passed radially through the side plates at both ends in the axial direction. The structure is fixed by the fastening member. According to this configuration, the inner pipe and the outer pipe are firmly fixed by the fastening member, so that even if a rotational torque is applied to either the inner pipe or the outer pipe, the inner pipe and the outer pipe rotate relative to each other. There is no risk of doing so. As the fastening member, screws, pins and the like can be used. In addition, in the form in which the inner pipe and the outer pipe are fixed at both ends in the respective axial directions, one end of the inner pipe and the outer pipe is partially outside the other axial end in the axial direction. It also includes a form in which the portions of both ends that overlap in the radial direction are fixed to each other.

Here, at least one of the inner pipe and the outer pipe can be made of fiber reinforced plastic (FRP).

Further, if the fastening members are arranged in a staggered manner along the circumferential direction (so that the positions of the fastening members are adjacent to each other in the circumferential direction but are displaced in the axial direction), the inner pipe and the outer pipe are more firmly fixed. Even if the number of fastening members is increased, the distance between the fastening members is wider than when the fastening members are arranged on the same circumference, so that the strength around the fastening members in the inner pipe, outer pipe, and side plate is reduced. Is suppressed. In particular, when at least one of the inner pipe and the outer pipe is made of FRP, a decrease in strength around the fastening member tends to be a problem, such as cracks easily occurring due to the directionality of the reinforcing fibers. , It is effective to arrange the fastening members in a staggered pattern.

Further, if the fastening member is inserted through the outer pipe and the side plate and inserted into the fastening hole formed from the outer peripheral surface of the inner pipe to the middle of the thickness, it is inserted into the inner circumference of the inner pipe. Therefore, the member supporting the double resin pipe and the fastening member do not interfere with each other, and the member can be easily incorporated into an existing device or the like. Further, when the inner pipe is made of FRP, burrs do not protrude from the inner peripheral surface of the inner pipe when a fastening hole is made in the inner pipe, so that the case is compared with the one having a fastening hole penetrating the inner pipe. As the burr removal work can be omitted, it becomes possible to manufacture efficiently.

When the double resin pipe of the present invention is used as a winding core in which a film-shaped or sheet-shaped long material is wound around the outer peripheral surface of the outer pipe, the inner pipe is wound during the winding operation of the long material. It is possible to prevent slipping troubles, and a particularly remarkable effect can be obtained.

Further, in the method for manufacturing a double resin pipe of the present invention, in the method for manufacturing a double resin pipe having the above configuration, after the side plate inserted between the inner pipe and the outer pipe is adhered to the inner pipe and the outer pipe, the above-mentioned method is performed. The outer pipe, the side plate, and the inner pipe are perforated to form a fastening hole for inserting the fastening member. By doing so, the fastening holes of the outer pipe, the side plate, and the inner pipe can be formed without any positional deviation, and the fastening work by the fastening member can be efficiently performed.

As described above, in the double resin pipe of the present invention, since the inner pipe and the outer pipe are firmly fixed by the fastening member via the side plate, the rotational torque is applied to either the inner pipe or the outer pipe. Even if a load is applied, there is no risk that the inner pipe and the outer pipe will rotate relative to each other, and there is a remarkable effect that slipping trouble of the inner pipe during winding work can be prevented, especially when it is used as a winding core for winding a long material. Is obtained.

Further, in the method for manufacturing a double resin pipe of the present invention, when manufacturing a double resin pipe having the above configuration, the inner pipe, the side plate, and the outer pipe are perforated in a bonded state to form a fastening hole. Therefore, the fastening work by the fastening member can be efficiently performed.

Partial cutout front view of the double resin pipe of the embodiment Right side view of FIG. Longitudinal front view showing the main part of FIG. 1 in an enlarged manner An exploded perspective view showing a modified example of the arrangement of the screws (fastening members) of FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. This double resin tube is used as a winding core of a winder installed in the manufacturing process of a long material such as a film-shaped member or a sheet-shaped member, and as shown in FIGS. 1 and 2, the inner tube is used. Inserted between the inner pipe 1 and the outer pipe 2 arranged coaxially with the inner pipe 1 with a predetermined radial gap on the radial outer side of the inner pipe 1 and between the inner pipe 1 and the outer pipe 2 at both ends in the axial direction. The inner pipe 1 and the outer pipe 2 are fixed to each other with screws 4 as a plurality of fastening members via the both side plates 3, and are inserted into the inner circumference of the inner pipe 1. It is designed to be used while being supported by the chuck of the winder.

The inner tube 1 and the outer tube 2 are both tubes made of resin (FRP) formed by a filament winding molding method. In the filament winding molding method, reinforcing fibers are wound around the outer periphery of a cylindrical core material, and the resin impregnated in the reinforcing fibers is heat-cured. In this example, glass fibers are used as the reinforcing fibers. Further, the outer pipe 2 is formed to be slightly shorter than the inner pipe 1, and both end faces are covered with a part of the side plates 3 arranged flush with the end face of the inner pipe 1.

As shown in FIGS. 1 and 3, the side plate 3 is an annular member inserted without a gap between the end of the inner pipe 1 and the end of the outer pipe 2, and the outer pipe 2 is inserted at the outer end in the axial direction. It has a flange 3a that covers the end face of the. The side plate 3 is made of polyvinyl chloride, but the material is not limited thereto.

Hexagon socket set screws are used as the screws 4, and eight screws arranged at equal intervals in the circumferential direction (see FIG. 2) are provided from the radial outside of the outer pipe 2, respectively, to the outer pipe 2 and the side plate. It is screwed into the screw holes (fastening holes) 2a, 3b, and 1a formed in 3 and the inner pipe 1. Here, the screw hole 1a of the inner pipe 1 is formed only from the outer peripheral surface of the inner pipe 1 to the middle of the thickness, so that the screw 4 does not protrude from the inner peripheral surface of the inner pipe 1.

This double resin pipe has the above configuration, and since the ends of the inner pipe 1 and the ends of the outer pipe 2 are fixed with screws 4 via the side plates 3 at both ends in the axial direction, the inner pipe 1 and the outer pipe 1 and the outer pipe 2 are fixed. The pipe 2 is in a stronger fixed state than the conventional case of adhesive fixing, and there is no possibility of relative rotation even if a rotational torque is applied to either one.

Therefore, in a winder using this double resin pipe as a winding core, even if a rotational torque is applied to the inner pipe 1 from the chuck portion of the winder during the winding work of a long lumber, the inner pipe is used. There is no risk of 1 slipping, and stable operation can be performed.

Further, in this double resin pipe, the screw 4 for fixing the inner pipe 1 and the outer pipe 2 is prevented from protruding from the inner peripheral surface of the inner pipe 1, so that the screw 4 interferes with the chuck portion of the winder. It is easy to incorporate it into an existing winder as a winding core. Moreover, even if the inner pipe 1 is made of FRP, burrs do not protrude from the inner peripheral surface of the inner pipe 1 when the screw hole 1a of the inner pipe 1 is drilled, so that there is no need to perform deburring work. , It can be manufactured more efficiently than the case of drilling a screw hole that penetrates the inner pipe.

Then, when manufacturing this double resin pipe, side plates 3 are inserted between the inner pipe 1 and the outer pipe 2 at both ends in the axial direction, and after each side plate 3 is adhered to the inner pipe 1 and the outer pipe 2, after Threaded holes 2a, 3b, and 1a are formed by threading and drilling the outer pipe 2, the side plate 3, and the inner pipe 1 from the radial outer side of the outer pipe 2. As a result, the screw holes 2a, 3b, and 1a can be formed so that the female screws are surely continuous without being displaced, and the screw 4 can be efficiently fastened.

FIG. 4 shows a modified example of the arrangement of the screws 4 of the above-described embodiment. In this modified example, the number of screws 4 is doubled as in the examples of FIGS. 1 to 3, and the screws 4 are arranged in a staggered manner along the circumferential direction. Further, in order to carry out the staggered screw 4 arrangement, the width (axial dimension) of the side plate 3 is made larger than that in the examples of FIGS. 1 to 3.

In this modified example, the inner pipe 1 and the outer pipe 2 are more firmly fixed by increasing the number of four screws, and by adopting the staggered screw four arrangement, the screws 4 are arranged on the same circumference as compared with the case where the screws 4 are arranged on the same circumference. Since the distance between the screws 4 is widened and the strength decrease around the screws 4 in the inner pipe 1, the outer pipe 2 and the side plate 3 is suppressed, the screws 4 can be used stably for a long period of time.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims, not the above-mentioned meaning, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

For example, in the above-described embodiment, the case where both the inner pipe and the outer pipe are made of FRP has been described, but one or both of the inner pipe and the outer pipe are formed of a resin containing no reinforcing fiber. You can also do it.

Further, the fastening member for fixing the inner pipe and the outer pipe so as not to rotate relative to each other is not limited to the screw of the embodiment, and the inner pipe such as a pin which is driven into the inner pipe from the outer pipe via the side plate and is in a tightened state. A pipe that is passed through the outer pipe in the radial direction via a side plate can be used.

The present invention is not limited to the double resin pipe used for the winding core as in the embodiment, but can be widely applied to the double resin pipe in which the inner pipe and the outer pipe are fixed at both ends thereof. ..

1 Inner pipe 1a Screw hole (fastening hole)
2 Outer pipe 2a Screw hole (fastening hole)
3 Side plate 3a Flange 3b Screw hole (fastening hole)
4 screws (fastening member)

Claims (5)

A resin inner pipe and a resin outer pipe arranged coaxially with the inner pipe on the radial outer side of the inner pipe are provided, and the inner pipe and the outer pipe are fixed at both ends in the axial direction. In the double resin pipe, the end portion of the inner pipe and the end portion of the outer pipe are fixed by fastening members that are passed in the radial direction via the side plates at both ends in the axial direction.
The fastening member penetrates through the outer tube and the side plates, double resin pipe you characterized in that it is inserted into the fastening hole formed to the middle of the thickness from the outer peripheral surface of the inner tube. The double resin pipe according to claim 1, wherein at least one of the inner pipe and the outer pipe is made of a fiber reinforced resin. The double resin pipe according to claim 1 or 2, wherein the fastening members are arranged in a staggered manner along the circumferential direction. The double resin tube according to any one of claims 1 to 3 , wherein the long material in the form of a film or a sheet is wound around the outer peripheral surface of the outer tube as a winding core. In the method for manufacturing a double resin pipe according to any one of claims 1 to 4 , after the side plate inserted between the inner pipe and the outer pipe is adhered to the inner pipe and the outer pipe, the outer pipe, the side plate and the inner pipe are attached. A method for manufacturing a double resin pipe, which comprises drilling a pipe to form a fastening hole for inserting the fastening member.

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