JP2540394B2 - Elbow cover manufacturing method and manufacturing apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing an elbow cover used for moisture proofing, waterproofing, heat insulation and the like of a piping elbow portion of a chemical plant, a low temperature liquefied gas storage facility or the like.

[0002]

2. Description of the Related Art Conventionally, as a pipe elbow cover, a molded body made of a rigid polyurethane foam which is lightweight and has excellent heat insulation properties is widely used.

6 to 8 show an example of a conventional manufacturing method. This manufacturing method is characterized in that a straight-tube cover formed into a semi-cylindrical shape shown in FIG. 6 is used. In the figure, 1 is a cover body of rigid polyurethane foam, 2 is a moisture-proof / waterproof exterior sheet such as asphalt roofing, and 3 is a reinforcing sheet such as glass cloth.
Is fixed integrally with the cover body 1 by a self-adhesive action during foaming of the polyurethane foam. As shown in FIG. 7, the straight pipe portion cover is cut in a direction intersecting the pipe axis direction to form a trapezoidal (shrimp-shaped) semi-annular segment A when seen in a plane, and this segment A is shown in FIG. As described above, the cut surface is adhered by an adhesive to form an elbow cover.

[0004]

The method of manufacturing the elbow cover described above is based on the moisture-proof and
It utilizes the advantage of the straight pipe part cover that can easily integrate the waterproof exterior sheet without wrinkles, but has the following problems.

(A) Since the straight pipe cover is cut by the electric band saw, the larger the diameter, the larger the cutting error due to the vibration of the blade of the electric band saw. Adhesive sealing of seams becomes difficult. In the case of an elbow cover having a diameter of 66 cm, the gap between the segments may be 3 to 4 mm at the maximum due to a cutting error. (B) Although the reaction curing time is long, the workability can be improved by using an adhesive (Elastobond UP) having a low viscosity, but since it flows out from the segment seam before curing, sealing by adhesion cannot be performed. . (C) When an adhesive having a slow reaction curing time is used, the manufacturing time is several times or more as compared with the manufacturing method of the straight pipe portion cover.

[0006]

It is an object of the present invention to efficiently integrate a semi-annular segment obtained by cutting a straight pipe part cover formed in a semi-cylindrical shape in a direction intersecting the pipe axis direction without using an adhesive. An object of the present invention is to provide a method and an apparatus for manufacturing an elbow cover that can be performed.

[0007]

A method for manufacturing an elbow cover according to the present invention is a semi-annular segment obtained by cutting a semi-cylindrical foam synthetic resin molded cover for a straight pipe portion in a direction intersecting a pipe axis direction. Are placed at a required interval on the outer surface of the elbow matrix, and the surface openings of the semi-annular cavity portions left between the semi-annular segments are covered with a lid body via an exterior sheet, and each cavity portion is A synthetic resin foam solution is injected into the mixture to foam and cure, and the molded synthetic resin product formed by
The gist is that it is integrated with the semi-annular segment by its self-adhesive action, and at the same time, the exterior sheet is integrated with the molded body.

The elbow cover manufacturing apparatus according to the present invention comprises:
The outer surface of the elbow mother surface, the mold wall rising portions provided on both ends of the outer surface of the elbow mother surface in the pipe axis direction, and the inner and outer arc edges of the outer surface of the elbow mother surface in the width direction, and the outer surface of the elbow mother mold. The concave mold chamber formed by the section and the rising portion for the mold wall, so as to cover the voids between the semi-annular segments left when the semi-annular segments are arranged side by side with the required spacing, The gist of the present invention is to include a band-shaped lid mounted on the rising portion and an injection port provided on the rising portion for injecting a synthetic foamed resin solution into the hollow portion.

[0009]

In the method of manufacturing an elbow cover according to the present invention, even if the cutting accuracy of the straight-cylindrical cover formed into a semi-cylindrical shape is poor, the cut semi-annular segments are separated between the semi-annular segments. They are integrated by the self-adhesive action of the injected foam synthetic resin.

Further, in the elbow cover manufacturing apparatus according to the present invention, when the elbow cover is formed by using the semi-annular segment obtained by cutting the straight pipe portion cover formed in the semi-cylindrical shape, By arranging the exterior sheet piece in advance in the surface opening of the space between them, the exterior sheet can be integrated at the same time on the surface of the injection-foamed synthetic resin molding, as in the case of the segment.

In addition, in the elbow cover obtained by the manufacturing method of the present invention, the existing foam synthetic resin molding segment and the foam synthetic resin molded by injection foaming and curing are integrated by the self-adhesive action of the molding. Since it has a simplified structure, it can be made stronger than a conventional product that is bonded using an adhesive.

[0012]

1 and 2 show an elbow cover manufacturing apparatus according to an embodiment of the present invention. In the figure, reference numeral 10 denotes a metal prefabricated elbow pipe used as a master die. The prefabricated elbow pipe 10 has a rising edge for a mold wall on both axial ends and widthwise inner and outer arc edges of the outer surface portion of the master die. Boards 11, 12, 1
3 and 14 are provided respectively. The rising plates 11 and 12 at both ends in the pipe axis direction are made in a semicircular shape, and by the hinge 15,
It is rotatably attached to the ends of the arc edge side rising plates 13 and 14. The rising plates 13 and 14 on the arc edge side are fixed to the metal elbow pipe 10 by welding. As shown in FIG. 2, the rotatable rising plates 11 and 12 have bolts 17 protruding from a semi-circular end plate 16 provided on the end surface of the elbow pipe passed through the holes 11a of the rising plate 11 so that the nuts 18 are secured. By being applied, the nut is held at the rising position, and the nut can be removed and tilted outward from the rising position at the time of demolding, which will be described later.

A rising plate 14 on the outer arc edge of the elbow pipe.
A plurality of strip-shaped lids 19 curved in an arc shape so as to cover the elbow pipe in the circumferential direction are rotatably attached by hinges 20 to the portions having a required interval in the pipe axial direction. ing. A hook 21 is provided at the tip of each lid body 19, and a crumb 22 that is shared with the hook 21 is attached to the rising plate 13 at the inner arc edge.

The rising plate 14 having the outer arc edge is provided with an injection port 14a and an air vent hole 14b for the synthetic foamed resin stock solution at positions corresponding to the mounting portions of the respective lids 19.
The elbow pipe 10 is fixed to a support shaft 23 inserted through it,
The support shaft 23 is supported by columns 24. This is for facilitating the work at the time of manufacturing the elbow cover, and the support shaft 23 can be made rotatable by using a transmission mechanism such as a worm.

The semi-annular segment A for the cover shown in FIG.
Is the semi-annular segment for the cover described in FIGS. 6 and 7, and is used when manufacturing the elbow cover. The exterior sheet piece 2a shown in FIG. 4 is also used. The exterior sheet piece 2a is cut into the same size as the exterior sheet in the segment A.

In order to manufacture the elbow cover, as shown in FIG. 1, the cover semi-annular segments A are arranged at equal intervals including both ends of the elbow pipe 10 in the axial direction of the elbow pipe 10 so as not to be positioned. Temporarily secure it with adhesive tape (not shown). The size of the semi-annular segments used above is preferably the same size as the voids left between the semi-annular segments. In the illustrated example, a 90-degree elbow tube is divided into nine equal parts at a central angle, and four cavities of the same size are left for five semi-annular segments. If necessary, a glass cloth reinforcing sheet piece 25 matching the surface shape size is fixed to the surface of the elbow pipe between the semi-annular segments with a double-sided adhesive tape (not shown).

Next, the double-sided adhesive tape 26 is attached to the peripheral surface of the semi-annular segment A on the opposite edge side, and the exterior sheet piece 2a is attached on the adhesive tape to cover the space between the semi-annular segments. After that, the strip-shaped lid 1 is placed on the exterior sheet piece 2a.
9 cover the clamp 22 with the lid 19
Hang it on the hook 21 and fix it by tightening. Next, from the injection port 14a of the rising plate 14, an injection foaming machine (not shown) is used to inject the synthetic foamed resin stock solution into each space between the segments. After the foaming and hardening of the injected undiluted synthetic resin foam is completed (the foaming and hardening time of polyurethane is about 20 minutes), the product is demolded. For demolding, stand up plates 1 at both ends
This is performed by lowering the lids 1 and 12 and opening the lid 19.

According to the above-mentioned manufacturing method, the synthetic resin molded body which is foam-cured in the space between the semi-annular segments is integrated with the semi-annular segment by the self-adhesive action during foam curing.
At the same time, the exterior sheet 2a is integrated with the outer surface of the molded body and the reinforcing sheet 25 is integrated with the inner surface. Therefore, an elbow cover having the same structure as the straight pipe cover can be obtained. FIG. 5 shows the elbow cover product. In the figure, B is a foam-hardened molded body portion.

In the above manufacturing apparatus, the thickness of the obtained elbow cover is regulated by the height of the mold wall rising plates 13 and 14, and becomes the maximum thickness, but if the cover is thinner than that, Can be manufactured. In that case, depending on the thickness of the segment to be used, it is possible to manufacture by simply attaching a thickness adjusting sheet made of a rubber sheet or the like to the inner surface of the band-shaped lid body 19 with a double-sided adhesive tape. For example, the manufacturing apparatus configured as described above can manufacture an elbow cover having a thickness of 25 mm to 75 mm.

[0020]

According to the manufacturing method of the elbow cover of the present invention, the working efficiency is higher than that of the manufacturing method in which the semi-annular segment obtained by cutting the straight-cylindrical cover formed into a semi-cylindrical shape is bonded with an adhesive. Can be significantly improved. For example, in terms of manufacturing speed, it can be expected to be 1/2 or less of the conventional bonding method. Further, by using the elbow cover manufacturing apparatus of the present invention, not only can the elbow cover using the semi-annular segment be configured very simply and easily, but the thickness of the injection foam synthetic resin molded body can be changed depending on the semi-annular segment thickness. It can also be adjusted. Furthermore, in the elbow cover obtained by the manufacturing method of the present invention, the existing foamed synthetic resin molded segment and the foamed synthetic resin molded body that has been injection foam cured are integrated by the self-adhesive action of the molded body. Therefore, a stronger structure can be obtained as compared with the conventional product which is bonded by using an adhesive.

[Brief description of drawings]

FIG. 1 is a perspective view of an elbow cover manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a part of the elbow cover manufacturing apparatus.

FIG. 3 is a perspective view of a cover semi-annular segment.

FIG. 4 is a perspective view of an exterior sheet piece.

FIG. 5 is a perspective view of an elbow cover product.

FIG. 6 is a perspective view of a semi-cylindrical straight-tube cover.

FIG. 7 is an explanatory view of a cutting process of a semi-cylindrical straight pipe part cover.

FIG. 8 is a bottom view of an elbow cover configured by adhering segments by a conventional manufacturing method.

[Explanation of symbols]

 A Semi-annular segment 1 Cover body of rigid polyurethane foam 2 Exterior sheet 3 Reinforcement sheet 10 Elbow pipe for mother mold 11, 12, 13, 14 Standing plate for mold wall 15 Hinge 16 Semi-circular end plate 17 Bolt 18 Nut 19 Band-shaped lid Body 20 Hinge 21 Hook 22 Clamp 14a Injection port 14b Air vent hole 23 Support shaft 24 Strut 2a Exterior sheet piece 25 Reinforcement sheet piece 26 Double-sided adhesive tape

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication 2-3683 (JP, B2) Japanese Patent Publication 2-3690 (JP, B2)

Claims (2)

(57) [Claims] 1. A semi-annular segment obtained by cutting a semi-cylindrical foam synthetic resin molded cover for a straight pipe portion in a direction intersecting the pipe axis direction is provided with a required space on the outer surface of the elbow mold. Placed, the surface opening of the semi-annular cavity portion left between the semi-annular segments is covered with a lid through an exterior sheet, and foamed synthetic resin stock solution is injected into each cavity to foam and cure, The foamed synthetic resin molded body formed thereby,
A method for manufacturing an elbow cover, characterized in that it is integrated with the semi-annular segment by its self-adhesive action, and at the same time, the exterior sheet is integrated with the molded body. 2. An elbow master mold outer surface portion, and mold wall rising portions provided on both ends of the elbow master mold outer surface portion in the pipe axis direction and on both inner and outer arc edges of the elbow master mold outer surface portion in the width direction. , A space between the semi-annular segments left when the semi-annular segments are arranged side by side at a required interval in a concave mold chamber formed by the outer surface of the elbow mold and the rising part for the mold wall So that it can cover the ridge, a strip-shaped lid attached to the rising portion, and an injection port provided in the rising portion for injecting a synthetic foamed resin solution into the void portion. Elbow cover manufacturing equipment.