JPS608017A - Method and apparatus for preparing foamed resin heat insulating cover - Google Patents

Abstract

PURPOSE:To obtain a mold of lighter weight without loading unreasonable force on the mold when a foamed resin heat insulating cover of elbow type pipe is molded in the split-in-two form by molding two pieces at the same time. CONSTITUTION:A mold is composed of an inner force 21, a pair of outer forces, upper and lower 31, four ring frames 41, several metal fixings 42 and so on. A pair of outer forces 31 are fitted to the assembled inner force 21. The thickness of the space making a part of a split-in-two hollow doughnut circle formed by the outside of the core 23 of the inner force and the inside of the cover plate 32 of the outer force is adjusted to be constant and then the flat plate 22 of the inner force 21 and the flanges 33 of the outer force 31 are fixed by metal fixings 42.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a foamed resin heat insulating cover and a manufacturing apparatus used for the manufacturing, and more particularly, to a foamed resin heat insulating cover used for pipes, etc. When manufacturing two-piece insulation covers that are mainly used for curved pipe parts such as elbows, the two pieces are molded at the same time so that foaming pressure is evenly applied to the manufacturing equipment, and the inner mold is also coated with foaming pressure.

Made of foamed resin that prevents heat dissipation by using an insulating material, making it possible to omit or shorten the preheating time of the mold, and by using a thin plate for the outer mold, it is possible to reduce the size of the mold. The present invention relates to a method for manufacturing a heat insulating cover and an apparatus for manufacturing the same.

Liquefied natural gas and liquefied petroleum gas have been widely used as fuel for power generation and city gas due to the effects of the recent oil crises and for the purpose of controlling pollution. As is well known, these liquefied gases are stored or transported at low temperatures, so storage tanks,
Piping, etc. must be insulated. These storage tanks, piping, etc. have recently become larger and larger, and taking piping as an example, the size is 20B.
~40B, and the insulation thickness is also required to be 150~250mm. FIG. 1 ((A) is a sectional view, (B) is a front view) is a diagram showing an example of such a piping insulation method. In the figure, a heat insulating cover 2 is attached to the outside of the pipe 1. The heat insulating cover 2 has a cylindrical shape cut in half, and is molded to a predetermined length for ease of handling. Meji 3 is filled between the piping 1 and the heat insulating cover 2 and between the heat insulating covers 2 and fixed to each other. When the diameter of the pipe is large and the insulation thickness is thick, a heat insulation cover made of a cylinder divided into three or four parts may be used.

Foaming urethane resin is often used as the material for this heat insulating cover. In addition to its excellent insulation performance, it can be easily foamed on-site.
This is because it has the advantage of significantly reducing transportation costs.

Conventionally, this foamable urethane resin heat insulating cover has been molded using a mold as shown in 6-2 (perspective view). That is, in the same figure, the mold 11 consists of a female mold 12, a male mold 13, and two end plates 14. A half-cylindrical space 12A having a diameter approximately equal to the outer diameter of the required heat insulating cover is provided in the center of the female mold 12, and a half cylindrical space 12A having a diameter approximately equal to the outer diameter of the required heat insulating cover is provided in the center of the male mold 13. A cylindrical half-shaped convex portion 13A having approximately the same outer diameter is provided. The lengths of the space portion 12A and the convex portion 13A are both made to substantially match the length of the required heat insulating cover. The end plate 14 is a plate having a height and width approximately equal to the height and width of the female mold 12.

The following procedure is used to mold a heat insulating cover using this mold 11.

■ Place the two end plates 14 into the female mold 12.

■Set the male mold 13 into the female mold 12.

■ Tighten the female mold 12 and male mold 13 using a tool (° not shown in Figure 2).

■ Mix and stir the foaming urethane resin stock solution.

■ Pour the foamable urethane resin stock solution into the space 12A of the female mold 12.

(2) After foaming and a predetermined curing period after foaming, the mold is disassembled in the reverse order to take out the heat insulating cover 2 (shown on the recess 12A of the female mold 12 in FIG. 2).

The conventional method of forming a heat insulating cover described above had no major drawbacks while the size of the heat insulating cover was small, or as the size of the heat insulating cover gradually increased, the following drawbacks were observed. .

■ When foaming urethane resin, foaming pressure is applied to each part of the mold, which tends to cause mold deformation.Especially, half-split molds have a shape that is mechanically disadvantageous to pressure, so the mold should be made with a thick wall. It needs to be highly rigid, making the mold expensive.

■ Each component of the mold is heavy, so it takes a lot of time to disassemble and assemble, and a large crane is also required, which increases equipment costs and ultimately increases the cost of the insulation cover.

7- ■ It is desirable to preheat the mold to 40° to 50°C to promote foaming, but since each component is thick, it has a large heat capacity and takes time to heat. A lot of energy is wasted.

■ Insulating covers are needed not only for straight pipes, but also for curved pipes such as elbows, but the mold used to mold such insulating covers for curved pipes is more irregular than that for straight pipes. Since the shape is more disadvantageous in terms of material mechanics,
The disadvantages described in , ■, and ■ are even greater than those for straight pipes.

The present invention eliminates the above-mentioned drawbacks of the conventional manufacturing method of foam resin insulation covers, and provides a method for easily and inexpensively manufacturing high-quality foam resin insulation covers, and a manufacturing apparatus used in the manufacturing method. is intended to provide.

The present invention realized that a curved pipe with strong resistance to internal pressure can be easily made by joining thin plates of metal etc., and uses this for the main part of the outer mold, -9--I-1 8- In addition, we have realized that there are materials such as foam glass that have strong resistance to external pressure and good heat insulation performance, and we have achieved the above objective by using these materials in the main parts of the inner mold.

Embodiments of the present invention will be described below based on the drawings. FIG. 3 is an exploded perspective view showing an apparatus for manufacturing a foamed resin heat insulating cover according to the present invention. In the figure, the manufacturing apparatus is comprised of an inner mold 21, a pair of upper and lower outer molds 31, four ring frames 41, several fasteners 42, and the like. Figures 4 to 8 (in either case, (A) is a front view and right side view)
2 is a diagram showing details of the components of the inner mold 21. FIG. That is, the flat plate 22 shown in FIG. 4 is a part of a circular ring and has a fan-like shape, and engaging protrusions 22A are provided at both ends of both sides of the flat plate 22. What is shown in FIG. 5 is the mandrel 23, which consists of a part of the annular plate (the one shown is approximately 1A part) and a part of the half-split p-donut (the one shown is approximately 1/4 part). At both ends of the flat portion thereof, engaging portions 23A that engage with the aforementioned retaining protrusions 22A are provided.

Fig. 6 shows a reinforcing material 24 made of canvas, asphalt roofing, etc., Fig. 7 shows a restraint (phantom 25), and Fig. 8 shows a restraint (small) 26. Reinforcing material 24 The shape approximates the developed view of the outer surface of the mandrel 23 described above, and the retainer (large) 25 and retainer (small) 26 are both approximately part of the annular plate (the one shown is the annular plate IA). part).

The inner mold 21 is attached by attaching a pair of mandrels 23 to both sides of a flat plate 220 by engaging their engagement recesses 23A with the engagement protrusions 22A, and then attaching reinforcing members 24 to the outer surface of the mandrels 23 (in this state). is shown in the center of Figure 3).
Further, on the outer and inner surfaces of the mandrel 23, one pair each of a retainer (dog) 25 and a retainer (small) 26 are attached to the flat plate 22 with the end portions of the reinforcing member 24 interposed therebetween. The assembly of the inner mold 21 is now completed.

Figure 9 shows the outer mold 31, (a) is a front view, (b)
is a right side view. In the figure, the outer mold 31 includes a cover plate 32 formed from a thin plate of metal or the like and shaped like a portion (1/4 of the ring in this figure) of an approximately half-split hollow donut, and the cover plate 32. It consists of a flange 33 attached to the outside of nine 320 halves. A resin injection port 34 is drilled near the inner side of the cover plate 32, and a plurality of protrusions 35 are removably housed on the inner surface of the semicircular openings at both ends of the cover plate 32. It is attached.

FIG. 10 is a diagram showing the ring frame 41, in which (a) is a front view and (b) is a right side view. In the same figure, ring frame 4
1 consists of a half-circular plate. FIG. 11 is a perspective view showing the stop plate 43, and FIG. 12 is a perspective view of the stop metal fitting 42. In both figures, the stop plate 43 is made of a rectangular plate;
In addition, the stopper 42 has a shape like a so-called mantis shrimp vise,
It has a structure.

Next, a method for manufacturing a foamed resin heat insulating cover using the manufacturing apparatus described above will be explained according to its process steps.

(α) A pair of outer W31'' is attached to the assembled product of the inner mold 21, and is formed by the outer surface of the core metal 23 of the inner mold and the inner 111 surface of the covering plate 32 of the outer mold. Adjust the thickness of the space forming part of the half-split hollow donut-shaped ring to be constant, and then fix the flat plate 22 of the inner mold and the flange 33 of the outer mold using the fasteners 42. .

(b) inserting four ring frames 41 into the opening of the end face of the space forming a part of the half-split hollow donut-shaped ring;
The inner surface of the protrusion 35 of the outer mold is attached to the outer surface of the ring frame 41, and the eight stop plates 43 are attached to the legs to stop the stop plates 43 and the flat plate 22 of the inner mold. It is fixed using the metal fittings 42. The assembly of the manufacturing apparatus is completed in this step, and the completed state is as shown in FIG. 13 ((a) is a front view, (b) is a bottom view). In order to simplify the drawings, the stopper 42 is shown only along its center line in this figure and in FIG. 14, which will be described later.

(C) Foamed resin is injected from the resin injection port 34 of the outer mold.

It goes without saying that preparations such as mixing a foamable resin stock solution must be made in advance for this injection. In addition, it is preferable that the injection method is as shown in FIG. That is, the manufacturing apparatus is placed on a horizontal surface of a workbench or the like 44 so that its resin injection port is directly above it, and resin is injected as shown by arrow X.

(d) After a predetermined curing period has elapsed, the stopper 42 is removed and the inner mold 21, outer mold 31. ! The molding frame 41 is disassembled and the molded product is taken out.

The method and apparatus for manufacturing the foamed resin insulation cover described above were mainly for 90° elbows, but
It goes without saying that the present invention can be effectively applied to heat insulating covers for 45° elbows, 1135° elbows, 1U bends, and the like. Of course, the present invention can also be effectively applied to a heat insulating cover for straight pipes.

In the present invention, when manufacturing a two-part heat insulation cover, by molding the two divided pieces at the same time, unreasonable force is prevented from acting on the manufacturing equipment, and a thin plate of metal or the like is used as the cover plate of the outer mold. The use of heat insulating materials to reduce the weight of the mold, and the use of heat insulating material in the core of the inner mold to prevent heat dissipation, have the following excellent effects: .

■ The weight of the mold can be reduced, and the cost of the mold can be reduced.

■ Since the mold is lightweight, it is extremely convenient to handle.Moaba does not require a large crane, which can significantly reduce equipment costs.

■ Since there is little heat dissipation and the mold itself is light, the preheating time is extremely short, and in some cases it is possible to omit preheating altogether, preventing energy loss and reducing costs.

■ The thin metal plates used for memory boards are extremely easy to process, and multiple pieces can be easily and firmly joined together using methods such as seams, making it easy to create curved surfaces with complex shapes. It can be made to. Furthermore, if foam glass or plastic foam is used as the heat insulating material for the mandrel, it is also extremely easy to process and can be easily molded into complex curved surfaces. Therefore, it is extremely convenient for manufacturing heat insulating covers for bent pipes.

■ In short, heat insulating covers made of foamed resin such as polyurethane can be manufactured easily and inexpensively, and can be quickly adapted to larger liquid equipment, making it possible to make a major contribution to overcoming the energy crisis.

[Brief explanation of the drawing]

Figure 1 shows an example of the insulation method used for liquefied natural gas and liquefied petroleum gas piping, where (a) is a cross-sectional view and (b) is a cross-sectional view.
2 is a front view, FIG. 2 is a perspective view showing a conventional mold for a heat insulating cover, FIG. 3 is an exploded perspective view showing an apparatus for manufacturing a foamed resin heat insulating cover according to the present invention, and FIGS. 4 to 8 The figures show details of the components of the inner mold; (A) is a front view, (B) is a right side view, and Figure 9 is a view showing the outer mold (
(a) is a front view, (b) is a right side view, Fig. 10 is a view showing the ring frame, (a) is a front view, (b) is a right side view, and Fig. 11 is a view showing the ring frame.
Figure 12 is a perspective view showing the stopper plate, Figure 12 is a perspective view showing the stopper, Figure 13 is a view showing the heat insulating cover manufacturing device when the assembly is completed, (a) is a front view, (b) is bottom view,
Figure 14 is a diagram showing the situation in which resin cloth is injected. (A) is a front view and (B) is a view from the upper left side. 21@-
111+inner mold, 22/1111-flat plate, 22A...
Engagement protrusion, 23... Core metal, 23A... Engagement recess, 24... Reinforcement material, 25... Holder metal (phantom, 26
...Pressure metal (small), 31・φ・・Outside mold, 32@e・
Nose glaze plate, 33・Kai・7uy9.34・・・・Resin injection port, 35・Skewer・Protrusion, 41＠・Ring frame, 42
...Stopping metal fitting, 43...Fist/stopping plate, 44...
Patent applicant for workbench etc. Sanshin Seinetsu Kogyo Co., Ltd. Agent Patent attorney Tsukamoto Inuzanbe-81- (f) (y) Ward C)

Claims (6)

[Claims] (1) A part of the ring consists of a flat plate in the shape of a fan, and an approximately half-split ring formed by rotating the semicircle around the - axis, which is attached to both sides of the flat plate. A pair of core metals made of heat insulating material with a partial shape, a reinforcing material made of cloth, asphalt roofing, etc. wrapped around the surface of the core metal,
an inner mold consisting of a pair of large and small hooks in the shape of a part of a ring, which are attached to the flat plate with the reinforcing material sandwiched between the outer side and the inner side of the core metal; two concentric halves; A pair of thin plate cover plates in the shape of a part of a hollow donut-shaped ring formed by rotating a circle around the - axis, and attached to the outer side of the nine half halves of the nuclear cover plate. A pair of outer molds consisting of a flange with a cylindrical shape and a resin injection port provided on a hollow plate; four half-ring frames each having an annular shape; and a plurality of fasteners. A method for manufacturing a foamed resin heat insulating cover, characterized in that the heat insulating cover is molded using the following steps (α) to (d) K: (α) a pair of cores of the inner mold; A pair of external molds are attached to the outside of the metal, and the thickness of the space forming a part of the hollow doughnut-shaped ring formed by the outer surface of the core metal and the inner surface of the cover plate is constant. Cb) Fix the flat plate of the inner mold and the flange of the outer mold with a fastening fitting. (C) Inject foamed resin from the resin injection port of the outer mold (d) After the specified curing period, disassemble the inner mold, outer mold, and ring frame and take out the molded product. (2) The diameter of the ring of the flat plate that makes up the inner mold, the radius of rotation of the mandrel, and the radius of rotation of the cover plate that makes up the outer mold are all infinite, so the molded insulation cover is suitable for straight pipes. 2. A method of manufacturing a thermal cover made of foamed resin according to claim 1. (3) The shape of the mandrel constituting the inner mold has a central angle of approximately 9
The shape of the cover plate, which is part of a 0° half-split donut-shaped ring and constitutes the outer mold, is a part of a half-split hollow donut-shaped ring with a central angle of approximately 90°, and is therefore molded. 2. The method of manufacturing a foamed resin heat insulating cover according to claim 1, wherein the insulating cover is for a 90° elbow. (4) A flat plate shaped like a sector, which is part of a circular ring, and a part of a roughly half-split donut-shaped circular ring, which is attached to both sides of the flat plate and is made by rotating the semicircle around the negative axis. A pair of core metals made of heat insulating material in the shape of 01, a reinforcing material made of cloth, asphalt roofing, etc. wrapped around the surface of the core metal,
an inner mold consisting of a pair of large and small pressers, which are attached to the flat plate with the reinforcing material sandwiched between the outer side and the inner side of the core metal, each having a shape of a part of a ring, and 12 concentric semicircles; a pair of thin plate cover plates in the shape of a part of an approximately half-split hollow donut-shaped ring formed by rotating the base plate around a - axis; A pair of outer molds consisting of a flange plate and a resin injection port provided on the cover plate; a ring frame having a ring shape of four halves; and a plurality of fasteners; The outer mold is attached to the outside of the mandrel of the inner mold, and a ring frame is attached to the end face of the space forming a part of the half-split hollow donut-shaped ring formed by the inner mold and the outer mold. An apparatus for manufacturing a heat insulating foam cover made of foamed resin, characterized in that after attaching the and outer mold with fasteners, resin is injected from a resin injection port to form the cover. (5) The diameter of the ring of the flat plate constituting the inner mold, the radius of rotation of the mandrel, and the radius of rotation of the cover plate constituting the outer mold are all infinite, and therefore the formed heat insulating cover is suitable for straight pipes. An apparatus for manufacturing a foamed resin heat insulating cover according to claim 4, characterized in that the apparatus is an apparatus for producing a heat insulating cover made of foamed resin according to claim 4. (6) The shape of the mandrel constituting the inner mold has a central angle of approximately 9
The shape of the cover plate, which is a part of a 0° half-split donut-shaped ring and constitutes the MiJ external mold, is a part of a half-split hollow donut-shaped ring with a central angle of approximately 90°, and therefore the forming 5. The apparatus for producing a foamed resin heat insulating cover according to claim 4, wherein the heat insulating cover is for a 90° elbow.