JPH04200629A - Production of shell for rectangular pressure vessel - Google Patents

Abstract

PURPOSE:To obtain a shell for a rectangular pressure vessel excellent in specific strength and specific rigidity by pressing the center of each side of the core so arranged as to form a square cylinder outward to extend the center in the center axial direction and to round each core. CONSTITUTION:The center of each side of the core so arranged as to form a square cylinder is pressed outward and extended in the center axial direction to round each core. A roving is then wound on the core by the filament winding method to produce the shell for a rectangular pressure vessel having a surface coating layer. The outer surface of the unculed surface coating layer is pressed by a flat plate to flatten the core and surface coating layer. The direction of the roving of the surface coating layer is adjusted in consideration of the stress produced by the internal pressure of the enclosed material to thin the surface coating layer, and the bulging and deformation of the shell are sufficiently controlled.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for producing nonyl for square pressure vessels.

[Prior Art and its Problems] Conventionally, a metal cylindrical container is generally used as a pressure container for storing chemical substances and the like.

However, cylindrical containers require a lot of effort to fix so that they do not move when loaded onto a vehicle, and a large amount of space is wasted when stacking them in a warehouse or the like. If a rectangular container with the same volume as a cylindrical container is made of metal, it will be heavier.

Therefore, in order to contain and transport chemical substances, etc., a pressure of 10 k
As a pressure vessel used at gf/cj or below, one can be considered to have a surface coating layer made of fiber-reinforced plastic on the core material forming a rectangular cylindrical body to reduce the weight.
When winding a surface coating layer made of fiber-reinforced plastic onto a rectangular cylindrical core material using the filament winding method, it is not possible to apply sufficient force to the roving to press it against the core material, resulting in the formation of air bubbles, etc. It had void defects and uneven thickness, which degraded the quality.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a method for manufacturing a shell for a rectangular pressure vessel, which has good storage efficiency in warehouses, vehicles, etc., is stackable, is lightweight, and has excellent specific strength and specific rigidity. There is.

[Means to solve the problem]

The present invention has been made in view of such conventional technical problems, and has a structure in which an aluminum honeycomb or an aramid honeycomb is used as the core material arranged to form a rectangular cylindrical body, and the outer side of the core material is A method for manufacturing a square pressure vessel shell having a surface coating layer made of fiber reinforced plastic, comprising:
After pressing the central part of each side of the core material arranged to form a square cylindrical body outward and bulging it so as to extend in the central axis direction, giving each core material a curvature, This is a method for manufacturing a square pressure vessel shell, in which a roving is wound onto the core material using a filament winding method to form a surface coating layer. Then, by pressing the outer surface of the surface coating layer before hardening with a flat plate, the core material and the surface coating layer can be flattened.

[Effect]

In the second method of manufacturing a rectangular pressure vessel shell, the central part of each side of the core material is pressed outward to bulge out to extend in the central axis direction, thereby imparting curvature to each core material. After application, a roving is wound onto the core material using a filament winding method to form a surface coating layer. Therefore, the tension of the roving can be effectively used as a pressing force to tightly wrap the roving over the core material. As a result, the wrapping of the rovings can form a surface coating layer without voids such as air bubbles between the surface and the rovings. The winding direction of the roving can be determined by taking into account the direction of stress caused by internal pressure during use as a rectangular pressure vessel.

A pressure vessel is generally constructed by attaching a bottom part and a lid to the rectangular pressure vessel shell manufactured in this manner.

When a chemical substance or the like with a pressure of 10 kgf/ci or less is stored in a pressure vessel, the square cylinder shell tends to bulge outward due to the internal pressure. However, the bulging deformation of the shell is effectively prevented by the core material forming the honeycomb body and the surface coating layer formed by the filament winding method. In addition, by adjusting the direction of the roving of the surface coating layer in consideration of the acting direction of stress caused by the internal pressure of the contained material, the bulging deformation of the shell can be effectively suppressed while reducing the thickness of the surface coating layer. I can do it.

If the outer surface of the surface coating layer before hardening is pressed with a flat plate and the core material and surface coating layer are flattened, an even better square cylinder will be formed, and the stability will be improved especially when stacking. do.

〔Example〕

Embodiments according to the present invention will be described below with reference to the drawings.

Figures 1-11 illustrate one embodiment of the invention. Reference numeral 1 indicates a mandrel, and as shown in FIG.
A strength member 2b is welded and fixed to the outer periphery, and a shaft 3 is inserted through the center and welded and fixed to connect them together. A notch 2c is formed, a sliding member 4 made of a highly rigid square material is slidably arranged in each notch 2C, and a pushing means 5 for pushing the sliding member 4 outward is attached. The extrusion means 5 consists of a bracket 5a which is positioned and fixed inside each notch 2c of the rectangular plate 2, and a threaded member 5b that is screwed into this bracket 5a. The sliding member 4 can be pushed outward while being guided by the notch 2C. Furthermore, each rectangle 12
Four holes 2d are formed at equal intervals in the hole 2d.
An insertion member 21b, which will be described later, can be inserted through the hole.

Four plate members 6 made of light metal (for example, aluminum, aluminum alloy) are arranged so as to cover each rectangular plate 2, and the four plate members 6 are connected to angle members 7 with screws 8. , each butting corner is filled with a light metal angle member 9 that is slidable in the direction of the central axis of the shaft 3. In this way, a flexible square cylindrical body is formed by the four plate members 6 and the angle members 7.9.

Next, a method of manufacturing a square pressure vessel shell using the above-mentioned mandrel 1 will be described.

First, a third plate is placed on the outer surfaces of the four plate members 6 and the angle member 9.
As shown in the figure, a mold release treatment is performed by applying a separating agent 10 or the like. A strip of fiber-reinforced plastic is wound around the outer surface of the mandrel 1 as shown in FIG. 4, and is cured to form the inner layer 11. This inner layer 11 can also be formed by a filament winding method.

Next, on the outer surface of the inner layer 11, four honeycomb bodies 12 made of aluminum or aramid, which are core materials, are placed on the outer surface of the inner layer 11.
Glue and fix so that a is almost perpendicular to the outer surface. This bonding operation of the honeycomb body 12 is performed by interposing an adhesive between the honeycomb body 12 and the inner layer 11 and using a fastening tool 13 as shown in FIG. The fastener 13 includes metal plates 13a arranged on the outer surfaces of the opposing honeycomb bodies 12, restraining members 13b arranged at appropriate intervals on the outer surfaces of each metal plate 13a, and clamping members 13b arranged at both ends of each restraining member 13b. Consisting of a bolt member 13c inserted through the bolt member 13c and a nut member 13d screwed into each bolt member 13c, the nut member 13d is screwed in to securely press the pair of opposing honeycomb bodies 12 to the inner layer 11. Glue. The other pair of honeycomb bodies 12 are each firmly adhered to the outer circumferential surface of the inner layer 11 after the pair of honeycomb bodies 12 are bonded or by using a similar fastener 13 with the restraining member 13b shifted in position.

The space created at the butt corner of each honeycomb body 12 is filled by adhering a stuffing member 14 made of urethane or aluminum, and the slight gap created between the stuffing member 14 and the honeycomb body 12 is filled with putty. In addition, each honeycomb body 12
As shown in FIG. 6.10, a thin intermediate plate 15 of fiber-reinforced plastic with glass cloth or carbon cloth as roving is laminated on the outer surface of the plate, and a resin which also serves as an adhesive is cured.

Next, in such a mandrel 1, the extrusion means 5 is applied to give each honeycomb body 12 a curvature as schematically shown in FIG. That is, the screw member 5b is connected to the bracket 5a.
Push each sliding member 4 outward while guiding it to the notch 2C, and remove the central part of each side of the four plate members 6, inner layer 11, honeycomb body 12, and intermediate Fi 15. A curvature is imparted by pressing it toward the center and bulging it out so as to extend in the direction of the central axis.

In this state, the shaft 3 of the mandrel I is rotatably attached to the filament winding forming apparatus. and,
Rovings 17a made of carbon fiber, glass fiber, etc. are wound around the honeycomb body 12 and the stuffing member 14 by a filament winding method while applying rotational drive to the mandrel 1 to form a surface coating layer 17 shown in FIG. 10. 9th
As shown in the figure, the roving 17a is guided by a guide roll 18, immersed in, for example, a thermosetting molten resin in a resin bath 19, passed through a pair of rolls 20, and placed on the intermediate plate 15 under a predetermined tension. and wrap it around to form a surface coating layer 17. By winding the rovings 17a while applying an appropriate tension, the rovings 17a are tightly wound with sufficient force applied during pressing, and there are no gaps such as air bubbles between the rovings 17a and the intermediate plate 15 and between the rovings 17a. It is possible to form a surface coating layer 17 that does not exist. When forming the surface coating layer 17 in this way, the direction of the fibers is determined in consideration of the direction of stress produced by internal pressure during use as a square pressure vessel.

After the surface coating layer 17 is cured, the action of the extrusion means 5 is released, and the nonyl for a square pressure vessel consisting of the inner layer 11, the honeycomb body I2, the surface coating layer 17, etc. is separated from the mandrel I. During this separation, each angle member 9 is pulled out in advance to reduce the outer size of the mandrel l. Each side of the separate rectangular pressure vessel shell has a slight curvature and bulges outward.

Using the square pressure vessel shell having such a structure, a bottom and a lid (not shown) are attached to assemble a square pressure vessel.

The square pressure vessel accommodates chemical substances, etc., and has a pressure of 10 kg.
Used below f/-. Due to the internal pressure of the contained material, it tries to bulge outward and deform. However, this bulging deformation is effectively prevented by the inner layer 11, the honeycomb body 12, the intermediate plate 15, and the surface coating layer 17.

Further, since the honeycomb body 12 is mounted so that the through holes 12a are substantially perpendicular to each outer surface, it is lightweight and effective in terms of specific strength and specific rigidity. Furthermore, by adjusting the direction of the fibers of the surface coating layer 17 in consideration of the acting direction of the stress caused by the internal pressure of the contained material, it is possible to reduce the thickness of the surface coating layer 17 and improve the expansion deformation of the pressure vessel. Can be suppressed.

By the way, each surface of the rectangular pressure vessel shell has a slight curvature and bulges outward. In order to correct this bulging deformation, as shown in FIG. 8, the action of the extrusion means 5 is released and the correction means 21 is brought into action before the surface coating layer I7 is hardened. As shown in detail in FIG. 11, the correction means 21 includes a correction plate 21a and a pressing member 21e, each of which is a flat plate and which is placed on the surface coating layer 17 having a square shape, and each rectangular plate 2.
The insertion member 21b and the pressing member 21 are inserted into the hole 2d.
e, a bolt member 21c inserted through the insertion member 21b, and a nut member 21d screwed onto the bolt member 21c, and by tightening the nut member 21d, the inner layer TI, honeycomb body 12, intermediate plate 15, surface coating layer 17, etc. are removed. The bulges on each side of the rectangular pressure vessel shell can be flattened. After flattening, the surface coating layer 17 is hardened and the straightening means 21 is released.

Pressure vessels using rectangular pressure vessel shells with this bulge corrected have a good square shape, making it easier to load and transport onto vehicles, and more efficiently with almost no gaps in warehouses. Can be stacked and stored.

〔Effect of the invention〕

As understood from the above explanation, according to the present invention, the following effects can be obtained.

(1) Wrapping of rovings can form a surface coating layer of good quality without void defects such as bubbles or uneven thickness between the surface and between the rovings, and the square-shaped pressure has excellent specific strength and specific rigidity. Container shells can be manufactured. In addition, according to the rectangular pressure vessel shell manufactured by this method, outward bulging deformation due to internal pressure is suppressed by the honeycomb core material and the surface coating layer made of fiber-reinforced plastic. Since the shape of the cylindrical body is firmly held, a high degree of specific strength and specific rigidity is ensured. As a result, the reliability and durability of the pressure vessel are both good.

(2) According to the shell for a square pressure vessel manufactured by this method, it has a structure that has a surface coating layer made of fiber reinforced plastic on the outside of the core material made of aluminum honeycomb or aramid honeycomb, and is relatively lightweight. be.

(3) According to a pressure vessel constructed by attaching a bottom and a lid to a rectangular pressure vessel shell manufactured by this method,
Since they are rectangular in shape, they can be stacked and stored efficiently in warehouses, vehicles, etc. with almost no gaps.

[Brief explanation of the drawing]

Figures 1 to 11 show one embodiment of the present invention, Figure 1 is a diagram showing a mandrel, Figure 2 is a sectional view taken along line 11-11 in Figure 1, and Figures 3 to 8 each show the manufacturing process. Fig. 9 is a schematic diagram showing a filament winding device, Fig. 1O is a sectional view showing an enlarged corner of a rectangular pressure vessel shell,
FIG. 11 is a diagram showing the correction means. 1: Mandrel 52: Rectangular plate, 3: Shaft, 4: Sliding member,
5: Extrusion means, 6: Plate member, 7.9: Angle member, 1
1 inner layer, 12: honeycomb body (core material), 12a: through hole, 1
3: Fastener, 14: Packing member 515: Intermediate plate, 17: Surface coating layer, 17a: Roving, 19: Resin tank, 21:
corrective means. 21a: Correction plate (flat plate). Agent Patent Attorney Mae 1) Hiroshi (Fig. 1, Fig. 2, Fig. 9, Fig. 10, Fig. 11) 21d 2d

Claims (2)

[Claims] (1) A method for manufacturing a shell for a square pressure vessel, in which aluminum honeycomb or aramid honeycomb is used as the core material arranged to form a square cylindrical body, and a surface coating layer made of fiber-reinforced plastic is provided on the outside of the core material. Then, the central part of each side of the core material arranged to form a square cylindrical body is pressed outward to bulge out so as to extend in the direction of the central axis, giving each core material a curvature. A method for producing a shell for a rectangular pressure vessel, characterized in that a roving is then wound around the core material using a filament winding method to form a surface coating layer. (2) Pressing the outer surface of the surface coating layer before curing with a flat plate,
The method for manufacturing a square pressure vessel shell according to claim 1, wherein the core material and the surface coating layer are flattened.