JPS584613B2 - Buoy manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing a buoy that can be used for a long period of time and that can be easily and quickly installed without requiring a bonding process between parts. One embodiment of this will be described below based on the drawings.

In FIGS. 1 and 2, 1 is a rotary type, and is rotatable around a horizontal axis 2. In FIG.

First, the film 3 is placed on the inner peripheral surface of the rotary mold 1.

Next, brim-like bodies 4 and 5 are attached within the film 3 and at both ends of the rotary mold 1.

These brim-like bodies 4, 5 are disc part 4A5A, disc part 4A
, 5A, and outer ring portions 4B and 5B that are continuous inward from the outer edge of the outer ring portions 4B and 5B.
It consists of inner ring parts 4D and 5D which are connected outwardly to form central holes 4C and 5C, and a foaming liquid inlet 6 is formed in one disc part 5A.

Therefore, the attached brim-like bodies 4 and 5 are attached to the outer ring portion 4B.
, 5B come into contact with the film 3, and at this time the brim-like bodies 4, 5 are fixed to the rotary mold 1 by appropriate means.

Next, as shown in FIGS. 3 and 4, while the rotary mold 1 is being rotated, a resin supply pipe 7 is inserted through one central hole 5C, and resin is supplied from its nozzle 8 to form both by centrifugal molding. A resin cylindrical body 9 is formed integral with the brim-like bodies 4 and 5, that is, integral with the outer ring portions 4B and 5B.

The resin used in this case may be either thermosetting or thermoplastic, and may also be resin concrete or fiber reinforced resin.

Next, as shown in FIGS. 5 and 6, with the rotation of the rotary mold 1 stopped, a pipe 10 is inserted between the central holes 4C and 5C.
Insert.

At this time, the resin cylinder 9 is not yet cured, but has been cured to the extent that it does not drip.

Further, the inserted pipe 10 is in close contact with the inner ring portions 4D and 5D.

The pipe 10 is pre-formed as a horizontally layered pipe with inner and outer fiber-containing resin layers and an intermediate mortar layer, and has a grain 11 formed on its outer peripheral surface.

After inserting the pipe 10, a foaming liquid injection pipe 12 is connected to the foaming liquid injection port 6, and the foaming liquid to be supplied is passed through the pipe 10.
The buoyancy body 13 is filled by foaming in the space formed by the resin cylinder 9 and the brim-like bodies 4 and 5.

As the buoyant body 13 to be foamed, polyethylol, polyethylene, urethane, cement, etc. are used.

After foam filling, the foaming liquid injection pipe 12 is removed and the mold is demolded to obtain the buoy 14 shown in FIG. 7.

At this time, although the resin cylinder 9 is not cured, its shape is not disturbed due to the sandwich between the buoyant body 13 and the film 3, and the film 3 makes demolding smooth.

Furthermore, since the buoyant body 13 bites into the grit 11 due to its foaming, the connection with the pipe 10 is firmly established.

Note that the film 3 may be removed or left as is.

The buoy 14 manufactured as described above is used for holding fish farming nets, setting up oil fences, floating rafts, etc.

As an example, as shown in FIG. 8, a plurality of buoys 14 are arranged horizontally, and a rope body 15
It is used for fish farming by inserting the pipes 10 and the cables 15 into one body using appropriate fixtures, and then attaching the nets 16 to the cables 15.

According to the present invention described in the embodiments above, almost the entire body is made of resin, and the inside is... A filled buoy that can be used for a long period of time and is easy to install can be easily and quickly obtained without requiring a bonding process between the parts.

In other words, in the case of room-temperature molding using thermosetting resin, high production is possible because no curing time is required, and the brim-like body and resin cylinder are integrally molded and joined, and the resin cylinder and pipe are bonded by buoyancy. Since the pipe and brim-like body are joined and sealed by foaming the buoyant body, the whole can be quickly integrated, and the outer film and inner foaming allow the resin cylinder to be released in an uncured state. Can be molded.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and include FIGS. 1, 3, and 5.
The figures are longitudinal sectional front views showing the manufacturing state, Figures 2, 4, and 6.
7 is a partially cutaway front view of the manufactured buoy, and FIG. 8 is a front view showing an example of how the buoy is used. 1...Rotating type, 3...Film, 4,
5...Flame-like body, 4C, 5C...Central hole, 9...Resin cylinder, 10...Pipe,
13... Buoyant body, 14... Buoy.

Claims (1)

[Claims] 1. A film is placed inside a rotary mold, a flange-like body is attached within the film and at both ends of the rotary mold, and resin is supplied into the rotary mold to form a resin cylinder integral with both flange-like bodies by centrifugal molding. A method for producing a buoy, in which a pipe is inserted between the central holes of the brim-like body, and a buoyant body is filled by foaming into the space formed by the pipe, the resin cylindrical body, and both brim-like bodies.