KR102672701B1 - A 3-layer assembled floating body production system using rotational molding method - Google Patents

Abstract

In the present invention, a foam member is disposed between the inner case and the outer case, and in particular, the inner case and the outer case are formed to a homogenized thickness using a rotational molding method;
In the production system of a three-layer assembled floating body using a rotational molding method to produce a floating body with a buoyancy space formed inside to generate buoyancy; The floating body includes an inner case in which the buoyancy space is formed; an outer case arranged inside the inner case forming a gap; and a foam member that is foamed and filled in the gap, wherein the inner case, the foam member, and the outer case are manufactured by molding and foaming by a rotational molding method through a rotational molding device. 3. A production system for layered structure assembled floating bodies is provided.
This project (result) is the result of a local innovation project based on local government-university cooperation conducted in 2023 with the support of the National Research Foundation of Korea with funds from the Ministry of Education. (Project Management Number: 2021RIS-002)
This results was supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea(NRF) funded by the Ministry of Education(MOE) (2021RIS-002)

Description

Production system for a 3-layer assembled floating body using rotational molding method {A 3-layer assembled floating body production system using rotational molding method}

The present invention relates to a production system for floating bodies that manufacture floating bodies designed to create buoyancy in water structures floating on the water, such as floating boats, barges, pontoons, etc.

Specifically, it relates to a production system for a three-layer structured floating body in which a foam member is disposed between the inner case and the outer case.

More specifically, the inner case and the outer case are formed to a homogenized thickness using the rotational molding method, so that the buoyancy is formed homogeneously, and the quality of use is improved. A three-layer assembled unit using the rotational molding method. It is about a fluid production system.

In general, water structures such as floating boats, barges, pontoons, cage fish farms, water pensions, water leisure facilities, etc. are equipped with floating bodies that create buoyancy on the water.

These buoyant bodies have various shapes and sizes to be suitable for the water structures to which they are applied, and are mainly molded using 'plastic' as the main material, and can be used in various ways such as extrusion molding, injection molding, vacuum molding, compression molding, and rotational molding. It is manufactured through molding methods.

Meanwhile, buoyancy bodies are typically formed in a 'barrel' shape with a buoyancy space formed inside, and are formed by filling the inside with a low-density 'EPS (Expanded Polystyrene) foam' filler.

In Korean Patent Application No. 10-2018-0022736 (name: Intelligent buoyancy tube with automatic buoyancy compensation function for aquatic structures/2018.02.26.), as announced in the gazette, aquatic structures are constructed with a sealed internal space. It is an intelligent buoyancy tube that automatically compensates for the buoyancy of the buoyancy tube for an aquatic structure, which constitutes a buoyancy body that floats on the water. The buoyancy tube monitors the presence or absence of flooding in the internal space of the buoyancy tube, and transmits a flooding detection signal when flooding occurs. A submersion detection sensor module; and an inflation gas generator that generates inflation gas by the submersion detection signal transmitted from the submersion detection sensor module, and is installed in a folded state in the inner space of the buoyancy tube and then expands by the inflation gas provided from the inflation gas generator. A buoyancy tube including an airbag module composed of an airbag that compensates for the buoyancy of the buoyancy tube is described.

And, in Korean Patent Application No. 10-2016-0130346 (name: eco-friendly fish farm buoy with air cap sealed and coated with synthetic resin/2016.10.08.), as known in the gazette, air used as packaging material and insulation material The cap is rolled around a plastic branch pipe to create a cylindrical pillar, and synthetic resin is applied to seal it (pure urea, improved polyurea super paper, pp, pe, and heat-accelerating materials, etc.) to create a buoy that is used as a fish farm buoy and a buoyancy tube for a barge. It is done.

Meanwhile, in Korean Patent Application No. 10-2008-0099378 (name: barge with attached tube/2008.10.10.), as known in the gazette, the material is made of rubber and synthetic resin-based materials, and air or It is used by injecting gas and maintains buoyancy for a long period of time. The rubber can be divided into natural rubber (N.R) and synthetic rubber. Synthetic rubber is NBR (Nitrile-Butadiene Rubber) and EPDM (Ethylene Propylene Diene Monomer) rubber. , Chloroprene Rubber, Silicone Rubber, and Polyurethane Rubber, etc., and tubes manufactured by mixing one or two or more of these materials are described.

In addition, in Korean Patent Application No. 10-2007-0111293 (name: Barge expansion structure and method/2007.11.02.), as known in the gazette, the first sealed buoyancy space is formed to be sealed inside. A second buoyancy space divided from the first buoyancy space and open downward is formed on the lower side, and a dock filled with a buoyancy member such as Styrofoam is provided inside the first buoyancy space.

Korean Patent Application No. 10-2018-0022736 (2018.02.26.) Korean Patent Application No. 10-2016-0130346 (2016.10.08.) Korean Patent Application No. 10-2008-0099378 (October 10, 2008) Korean Patent Application No. 10-2007-0111293 (2007.11.02.)

However, the conventional buoyancy bodies as described above are made of simple cylindrical air tubes or foam moldings such as Styrofoam, and thus have problems of not only being less durable but also causing environmental pollution when damaged.

The present invention was proposed to solve the above-described conventional problems, and the purpose of the present invention is to manufacture a floating body that forms buoyancy in water structures floating on the water, such as floating boats, barges, pontoons, etc. In this way, a foam member is placed between the inner case and the outer case, and in particular, the inner case and the outer case are formed to a homogenized thickness using the rotational molding method, so that the buoyancy is formed homogeneously, thus improving the quality of use. The goal is to provide a production system for a three-layer assembled floating body using an improved rotational molding method.

The production system of a three-layer assembled floating body using the rotation molding method according to the present invention to achieve the purpose of the present invention as described above is a rotational process for producing a floating body with a buoyancy space formed inside to generate buoyancy. In the production system of a three-layer assembled floating body using a molding method; The floating body includes an inner case in which the buoyancy space is formed; an outer case disposed on the outside while forming a gap with the inner case; and a foam member that is foamed and filled into the gap between the inner case and the outer case.

The inner case, the foam member, and the outer case are characterized in that they are manufactured by molding and foaming 'polyethylene (PE)' as a material.

The inner case, the foam member, and the outer case are manufactured by molding and foaming by a rotational molding method using a rotational molding device.

The rotation molding device includes a base frame whose longitudinal ends are rotatably coupled to the floor structure; A mold is coupled to the base frame so as to be capable of axial rotation in a direction perpendicular to the base frame, and is configured to sequentially mold and foam the outer case, the foam member, and the inner case.

The production system of a three-layer assembled floating body using the rotational molding method according to the present invention, which is achieved as described above, is applied to floating structures on the water such as floating boats, barges, and pontoons, and consists of an inner case, an outer case, and a foam member. They form buoyancy on the water surface through their respective buoyancy forces. In particular, the inner and outer cases are formed to a homogenized thickness using the rotational molding method, so that the buoyancy is formed uniformly, improving the quality of use. It has the effect of being

In addition, the external case's own elastic force not only stably offsets the impact load applied from the outside, but also forms stable durability by evenly distributing the impact load through the foam member placed on the inside. In particular, the external case Even if the case and foam member are damaged and lose buoyancy, buoyancy is maintained against impact water pressure through the inner case, which has the effect of increasing stability and safety in use.

In addition, because it does not use EPS foam, which was previously used for internal filling, there is no leakage of plastic fine particles, which is a major cause of environmental pollution in the water when damaged, and it is a homogenized product made of PE material, making it easy to recycle after collection.

Figure 1 is a schematic illustration showing a production system for a three-layer assembled floating body using a rotational molding method according to an embodiment of the present invention.
Figures 2 and 3 are schematic illustrations showing molds constituting a production system for a three-layer structured floating body using the rotational molding method according to this embodiment.
Figure 4 is a schematic illustration showing a floating body manufactured through a production system for a three-layer assembled floating body using the rotational molding method according to this embodiment.

Hereinafter, with reference to the attached drawings, a production system for a three-layer assembled floating body using a rotational molding method according to a preferred embodiment of the present invention will be described in detail as follows.

Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This example is provided to more completely explain the present invention to those with average knowledge in the art. Therefore, the shapes of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that identical members in each drawing may be indicated by the same reference numerals. Detailed descriptions of well-known functions and configurations that are judged to unnecessarily obscure the gist of the present invention are omitted.

1 to 4 are diagrams showing a production system (1) for a three-layer assembled floating body utilizing the rotational molding method according to an embodiment of the present invention, utilizing the rotational molding method according to this embodiment. The production system (1) for a three-layer assembled floating body is designed to produce a floating body (100) applied to water structures floating on the water such as floating boats, barges, and pontoons, and is designed to generate internal buoyancy. It is suitable for producing a buoyant space.

In the above, the floating body 100 may have an overall 'cylinder' or 'cube' shape; It can be appropriately applied depending on the user's choice.

In the production system (1) for a three-layer assembled floating body using the rotational molding method according to this embodiment, the floating body (100) has an inner case (110) in which the buoyancy space (A) is formed. and; an outer case 120 disposed on the outside while forming a gap with the inner case 110; It includes a foam member 130 filled in the gap between the inner case 110 and the outer case 120.

That is, the floating body 100 is composed of a three-layer structure in which the inner case 110, the foam member 130, and the outer case 120 are sequentially arranged and stacked, so that they float on the water surface through the buoyancy forces formed respectively. A stable buoyancy is formed.

In the above, the outer case 120 is molded from linear low density polyethylene (LLDPE: Linear Low Density Polyethylene), and as it forms its own elastic force, it is damaged during primary contact with the impact load applied from the outside. It can be offset by responding sexually.

In the above, the foam member 130 is formed of foam made of 'polyethylene (PE) foam' to stably offset the impact load applied inward while passing through the outer case 120 through even distribution. It can be.

In the above, the inner case 110 may be molded from polyethylene (PE), thereby increasing the overall structural durability of the floating body 100.

In particular, when the outer case 120 and the foam member 130 are damaged by impact load and lose buoyancy, the durability of the inner case 110 made of 'polyethylene (PE)' provides resistance to shock water pressure. Buoyancy can be maintained while responding stably.

Accordingly, stability and safety in use can be increased.

Meanwhile, in the production system 1 for a three-layer structured floating body utilizing the rotational molding method according to this embodiment, the inner case 110 and the outer case 120 are formed using a rotational molding device 10. It can be molded and manufactured using the ‘rotational molding method’.

That is, the inner case 110 and the outer case 120 are formed to have a homogenized thickness using a rotational molding method, so that buoyancy is uniformly formed, and the quality of use can be improved.

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In the above, the foam member 130 is molded and manufactured by inserting an 'external molding material' that primarily forms the outer case 120 inside the mold 12 constituting the rotation molding device 10. The 'foam material' is injected to form the foam member 130 secondarily by foaming, and the 'internal molding material' forming the inner case 110 is injected to form the foam member 130 tertiarily.

That is, the outer case 120, the foam member 130, and the inner case 110 can be formed by sequentially stacking and arranging them inside the mold 12 constituting the rotational molding device 10. ; The composition and structure of the molding and foaming process may be suitably selected by the user from among conventionally known techniques.

In the production system 1 of a three-layer assembled floating body utilizing the rotational molding method according to this embodiment, the rotational molding device 10 has both ends in the longitudinal direction with respect to the floor structure 200. A base frame (11) coupled to an axis so as to be rotatable; A mold (12) is coupled to enable axial rotation in a direction perpendicular to the base frame (11) and is configured to sequentially mold and foam the outer case (120), the foam member (130), and the inner case (110). ); may include.

That is, the 'materials' for molding and foaming the outer case 120, the foam member 130, and the inner case 110 are sequentially introduced into the mold 2, and are sequentially molded and foamed. can be formed.

In the above, the rotational molding device 10 includes a first driving means 13 that is driven by receiving power to rotate the base frame 11 axially; It may further include a second driving means 14 that is supplied with power and driven to rotate the mold 12 axially.

That is, according to the driving of the first driving means 13 and the second driving means 14, the base frame 11 and the mold 12 may each rotate on their axis.

Accordingly, the mold 12 can perform a 'two-axis rotational movement' with directions perpendicular to each other.

Accordingly, the 'materials' accommodated inside the mold 12 and molded and foamed are molded and foamed while forming an even distribution, so that the molding and foaming quality can be improved.

In the above, the configuration and structure of the first driving means 13 and the second driving means 14 may be suitably selected by the user from among conventionally known technologies.

In the production system 1 of a three-layer assembled floating body using the rotational molding method according to this embodiment, the mold 12 has a vacuum between the inner wall 121 and the outer wall 122. It is formed with a 'double-wall vacuum structure', which blocks convection, conduction, and radiation paths that transmit external heat, thereby stably maintaining the molding and foaming temperatures of the 'materials' that are injected inside and molded and foamed. .

Accordingly, the quality of molding and foaming processes performed inside the mold 12 can be improved.

In the above, the mold 12 is provided with a connection hole 123 that is opened at a time set by the drop box 2 and into which the material supply box 3 filled with the material is introduced; The drop box (2) is formed as a ‘double wall vacuum structure’; A 'pneumatic opening facility (4)' that operates the drop box (2) at a set time to open and close the connection hole (123) may be installed.

That is, in a state in which each of the 'materials' is filled in the material supply box 3, the drop box 2 is driven forward and backward through the supply and discharge of air pressure through the pneumatic opening facility 4, thereby connecting the drop box 2. The hole 123 is opened and closed.

At this time, when the connection hole 123 is opened, the material supply box 3 may be supplied into the interior of the mold 12 through the connection hole 123.

Accordingly, the 'materials' are sequentially introduced into the interior of the mold 12 through the connection hole 123 at set time intervals, thereby allowing the molding and foaming processes to be performed respectively.

In the above, the drop box 2 is formed in the same 'double wall vacuum structure' as the mold 12, and can be formed to form insulation properties that stably correspond to the melting temperature of the material and the external temperature and internal temperature, respectively. as; The configuration and structure selected by the user from among conventionally known technologies may be appropriately applied.

In the above, the material supply box 3 is made of a material that is easily damaged by heat and shock, and when heat and shock are applied to the inside of the mold 12, it is damaged and the 'material' filled inside is discharged and the mold 12 is damaged. ) that can be arranged to be supplied to the interior of; The material and structure selected by the user from among conventionally known technologies may be appropriately applied.

In the above, the pneumatic opening equipment (4) is designed to extract air pressure and perform forward and reverse driving of the drop box (2); The configuration and structure selected by the user from among conventionally known technologies may be appropriately applied.

In the production system 1 of a three-layer structured floating body utilizing the rotational molding method according to the present embodiment as described above, the mold 12 has a lower mold 124 with a molding space having a discharge opening therein. )class; It may include an upper mold 125 configured to open and close the discharge opening of the lower mold 124.

In other words, the 'molding' molded in the molding space can be separately discharged through the discharge opening opened and closed by the upper mold 125.

On the other hand, when attempting to mold and manufacture the floating body 100 through the production system 1 for a three-layer assembled floating body utilizing the rotational molding method according to this embodiment, first, the lower mold 124 The upper mold 125 is combined to form the mold 12, and the drop box 2 is inserted into the mold 12 through the pneumatic opening facility 4, which is sequentially driven at a set time. As it is driven, the connection hole 123 is opened and closed.

Then, when the connection hole 123 is opened, the material supply box 3 is introduced into the mold 12, and the connection hole is closed through reverse driving of the drop box 2, As the material supply box 3 is damaged through heat and impact inside the mold 12, the material filled inside is discharged and supplied to the molding space.

At this time, the 'material' constituting the outer case 120 is first introduced, the 'material' constituting the foam member 130 is secondarily introduced, and the 'material' constituting the inner case 110 is added. As the material is added three times, each molding process is performed separately.

In addition, while the 'materials' are supplied into the mold 12 at set time intervals, heating and rotational movement are performed on the mold 12 through the rotational molding device 10. As each 'material' sequentially introduced into the mold 12 is rotationally molded, the outer case 120, the foam member 130, and the inner case 110 are sequentially molded, forming the part. Fluid 100 is molded and manufactured.

In addition, when the floating body 100 is molded inside the mold 12, the mold 12 is cooled to shrink the floating body 100 while cooling, thereby forming the inner surface of the mold 12. It is separated from.

Then, when the floating body 100 is separated from the mold 12 through cooling of the mold 12, the rotational movement through the rotomolding device 10 is stopped, and the upper mold 125 is The manufacturing process is completed when the floating body 100 is removed from the lower mold 124 and the floating body 100 is taken out with the discharge opening open.

In the above, the thickness of the outer case 120, the foam member 130, and the inner case 110 depends on the 'amount of material (raw material)' input when the 'material' is input into the inside of the mold 12. can be custom formed.

As described above, the production system 1 of a three-layer assembled floating body using the rotational molding method according to this embodiment is applied to an aquatic structure floating on the water, and the inner case 110 and the outer case Buoyancy is formed with respect to the water surface through the respective buoyancy of the foam members 120 and 130, and the shock load applied from the outside is stably offset through the elastic force of the outer case 120. , stable durability is formed through even distribution of impact load through the foam member 130 disposed inside, and in particular, the outer case 120 and the foam member 130 are damaged and lose buoyancy. However, buoyancy is maintained against the shock water pressure through the inner case 110, and in particular, the inner case 110, the outer case 120, and the foam member 130 are homogenized using a rotational molding method. A feature of the technical configuration is that the buoyancy is formed homogeneously by being formed with a thickness.

One embodiment of the present invention described above is merely illustrative, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible. . Therefore, it will be understood that the present invention is not limited to the forms mentioned in the detailed description above. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the attached patent claims. In addition, the present invention should be understood to include all modifications, equivalents and substitutes within the spirit and scope of the present invention as defined by the appended claims.

1: Production system of floating body
10: rotational molding device 11: base frame
12: Mold 121: Inner wall
122: outer wall 123: connection hole
124: lower frame 125: upper frame
13: first driving means 14: second driving means
2: Drop box 3: Material supply box
4: Pneumatic opening facility
100: floating body
110: inner case 120: outer case
130: foam member 200: floor structure
A: Buoyancy space

Claims (4)

An inner case 110 with a buoyancy space (A) formed inside, an outer case 120 disposed on the outside while forming a gap with the inner case 110, and the inner case 110 and the outer case 120 ) The floating body 100, which is provided with a foam member 130 filled in the gap to form buoyancy, is sequentially formed by forming the outer case 120, the foam member 130, and the inner case 110. In the production system (1) for a three-layer structured floating body using a rotational molding method to be produced through a foaming mold (12);
The inner case 110 is,
It is molded using ‘polyethylene (PE)’;
The external case 120 is,
'It is molded from linear low density polyethylene (LLDPE: Linear Low Density Polyethylene);
The mold 12 is,
It is formed as a 'double wall vacuum structure' in which a vacuum is formed between the inner wall 121 and the outer wall 122, and the material is supplied by opening the connection hole 123 through the 'pneumatic opening facility 4' that is driven at a set time. A production system for a three-layer structure assembled floating body using the rotational molding method, wherein a box (3) is inserted and a drop box (2) formed in a 'double wall vacuum structure' is embedded. delete delete delete

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