KR101476318B1

KR101476318B1 - A floating body for buoy composed of multi-layer foam sheets and manufacturing method of it

Info

Publication number: KR101476318B1
Application number: KR20140126723A
Authority: KR
Inventors: 고성광; 임민석
Original assignee: 뉴마린엔지니어링(주)
Priority date: 2014-09-23
Filing date: 2014-09-23
Publication date: 2014-12-24

Abstract

The present invention relates to a buoyancy body for a buoy composed of a multi-layers arranged foam sheet and a manufacturing method thereof. According to the present invention, the buoyancy body can arrange the foam sheets having a hole on a surface on top of each other, increase connectivity between a rotation preventing plate and a fixing pin of a support rod, and uniformly and evenly cut the foam sheets which are laminated on top of each other with a heating means same as a hot wire, thereby enabling to easily provide a desired shape and size. Moreover, it is possible to maintain balance even in a rough sea condition and be stably used for a long time by inserting a thickness correction pin into an outer surface of the foam sheet which is uniformly and evenly cut, to uniformize a painting thickness by the structure of the thickness correction pin.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a buoyant body of a buoy consisting of a multi-layered laminated foam sheet,

The present invention relates to a buoyant body of a buoy, and more particularly, to a buoyant body of a buoy, and more particularly, to a buoyant body of a buoy, and more particularly, The present invention relates to a buoyant body of a buoy capable of being stably used for a long time due to its excellent bonding strength of a laminated foam sheet and a method of manufacturing the buoyant body.

Buoys, also known as buoys or buoys, are widely used as a means of directing a vessel to assist in the safe navigation of a ship, or as a means of alerting the location of dangerous goods in the ocean, such as reefs and sunken ships. A light buoy is called a light buoy when mounted on a buoy, such as a flashing light or a steady light, to illuminate a certain light in all directions. Such a light buoy can prevent a safety accident that can occur in the ocean It becomes a useful means.

A commonly used light table is shown in Fig. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a light- 1, the apparatus includes a back support 210 and a target object 220. A means 240 for supporting a center of gravity can be attached to a lower portion of the target object 220, One side is fixed to the seabed surface by a cable, a chain, or the like, and is not floated by the current. In addition, a separate bushing body 230 is provided inside the body 220. The body 220 supports various equipment installed on the body 220 using the bushing body 230 to float the sea surface.

Foam is the most widely used buoyant in the industry. The foam is foamed using a mold with a synthetic resin as a base material, and has a specific gravity smaller than that of water, and floats easily on the sea surface. Furthermore, in the foaming process in which the mold is opened, innumerable closed pores are formed inside the foam. Such closed pores function as a space filled with a considerable amount of air such as the inner space of the tube, thereby further enhancing the buoyancy function of the foam. As a buoyant body. Japanese Unexamined Patent Publication No. 09-240578 is disclosed as a buoyant body having such a single structure. However, since the foam is manufactured using a mold, it is extremely difficult to actually manufacture the foam over a certain size. That is, considering the size of a mold that can be practically used, it is impossible to manufacture a large body and a master.

In order to solve such a practical problem, a technology widely used in related industries is disclosed in Korean Patent Laid-Open No. 1997-0010578, in which a plate-like foam having a certain thickness is cut into a predetermined shape, and then an adhesive And then laminated in multiple stages. Japanese Unexamined Patent Publication (Kokai) No. 58-211987 discloses a technique of restricting a plurality of annular supporting bodies by a fixing metal such as a nut and stacking them.

These technologies are advantageous in that they are easy to manufacture because they form a buoyant body by simply cutting and bonding the foams distributed as commercial products. However, when used for a long time, the multi-layered laminate structure is easily collapsed There are disadvantages. That is, if the sea level fluctuates frequently due to waves and winds, the gap between the laminated bodies becomes inevitably widening, and eventually the laminated structure itself must collapse.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a buoyant buoyant body which can be manufactured in various sizes and shapes and a method of manufacturing the same.

Another object of the present invention is to provide a buoyant buoyancy body made of a foam sheet which can be stably used for a long period of time and a method for manufacturing the same.

It is still another object of the present invention to provide a buoyant body of buoys having excellent bonding strength between multi-layered foam sheets and a method of manufacturing the same.

It is still another object of the present invention to provide a buoyant buoyancy body that can flatly and uniformly cut the surface of a multi-layered foam sheet and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a buoyancy member of a buoy, comprising: a support shaft having a rod shape and including an upper fixed plate and a lower fixed plate provided at both ends, and a plurality of anti- A lower foam sheet laminated in multiple stages between a lower fixed plate and an upper fixed plate of a support rod, the lower foam sheet being formed of a plurality of semi-circular or fan-shaped plates at a lower portion thereof and having cut surfaces alternately stacked, A foam sheet having an upper foam sheet having a plurality of perforation holes formed on a surface thereof, a plurality of fixing pins inserted into the lower foam sheet, and a plurality of thickness correction pins inserted into the outer surface; And a surface protective layer made of a polyurea material applied to an outer surface of the foam sheet.

According to another aspect of the present invention, there is provided a method of manufacturing a buoyant body of a buoy, comprising: a first step of fixing a lower fixed plate to a lower end of a support rod provided with a rotation prevention plate; A lower foam sheet of a semi-circular plate or a fan-shaped plate having a plurality of perforated holes formed on its surface by using an adhesive to the support rod is closely stacked from the lower fixing plate to an upper portion thereof, A second step of laminating stacked layers; A third step of closely laminating an upper foam sheet of an original plate having a plurality of perforated holes formed on its surface to an upper end of the support bar in a conical shape using an adhesive on the lower foam sheet; A fourth step of fixing the upper foam sheet and the lower foam sheet to the support bar by fixing an upper fixed plate to the upper end of the support rod; A fifth step of rotating both ends of the support rod in a fixed state and cutting the outer surface of the upper and lower foam sheets by a heating means such as a hot wire provided in the cutting device to adjust the shape and dimensions; A sixth step of desiring the outside of the cut foam sheet as a woven net to increase the bonding force of the foam sheet; And a seventh step of inserting a plurality of thickness correction fins into the outside of the foam sheet and coating the outside with polyurea to manufacture the buoy.

In the method of manufacturing the buoyant body of the buoy according to the present invention, the heating wire used as the heating means is characterized by being a nichrome wire.

The second process of the method of manufacturing a buoyant body according to the present invention further comprises a step of inserting a plurality of fixing pins from the upper portion to the lower portion of the stacked lower foam sheet to improve the bonding force have.

The fifth step of the method for manufacturing the buoyant body of the buoy according to the present invention is characterized in that the fifth step of the method of manufacturing the buoyant body according to the present invention comprises a heating means such as a heat line for cutting the outer surface of the foam sheet, a tension device for keeping the tension acting on the heating means constant, And a control unit for controlling the heating means and the tension device.

The tension device of the method of manufacturing a buoyant body according to the present invention comprises a body, a rod connected to the heat generating means and passing through the upper portion of the body, a stainless steel wire connected to the rod, A load cell provided at a lower portion of the body, a cell provided at an upper portion of the body, a spring provided to surround the rod and the stainless steel wire between the cell and the load cell, and a stepping motor connected to the stainless steel wire The load and the cell are lifted up to extend the spring and the compression force of the spring is weakened so that the load transferred to the load cell is lowered so that the stepping motor To pull the stainless steel wire and to set the load cell This is applied the stepping motor is characterized in that the tension device driving the stopping operation.

According to the present invention, it is possible to easily manufacture a large buoyancy buoyancy body through a simpler process by cutting the foam sheet into a semi-circular plate or a fan-shaped plate, .

A plurality of holes are formed on the surface of the foam sheet to bond the adjacent foam sheets in a state in which the adhesive can easily permeate the adhesive sheet. A plurality of fixing pins are inserted into the lower foam sheet, The protective layer is formed as a polyurea, and the large buoyant body can stably float for a long time while maintaining its shape even in a rough marine environment.

In addition, by cutting the outer surface of the foam sheet by using the heating means connected to the tension device, the outer surface of the foam sheet is flat and uniformly cut, and a plurality of thickness correction fins are inserted into the foam sheet outside the formation of the protective layer, There is also an effect that the protective layer can be painted with a certain thickness.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a light-
2 is a perspective view showing a buoyant body of a buoy comprising a multi-layer laminated foam sheet according to the present invention.
3 is a partially cutaway perspective view showing a buoyant body of a buoy consisting of a multi-layer laminated foam sheet according to the present invention.
Fig. 4 is an exploded perspective view showing a supporting bar of a buoyant buoyant body made of a multi-layer laminated foam sheet according to the present invention.
5 is a flowchart showing a method of manufacturing a buoyant buoyancy member made of a multi-layer laminated foam sheet according to the present invention.
6A to 6E are views showing a laminated state of a lower foam sheet of a buoyant body of a buoy comprising a multi-layered laminated foam sheet according to the present invention.
7A and 7B are views showing the laminated state of the upper foam sheet of the buoyant body of the buoy comprising the multi-layer laminated foam sheet according to the present invention.
8 is a view showing a state in which a foam sheet of a buoyant body made of a multi-layer laminated foam sheet according to the present invention is cut with a cutting device.
9A and 9B are views showing a cutting device used for manufacturing a buoyant buoyancy member made up of a multi-layer laminated foam sheet according to the present invention.
10A and 10C are views showing a state in which a thickness correction pin is inserted into a foam sheet of a buoyant body made of a multi-layer laminated foam sheet according to the present invention, and a thickness correction pin.
11 is a view showing a state in which a buoyant body is manufactured by coating a foam sheet of a buoyant buoyancy body made of a multi-layer laminated foam sheet according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a buoyant buoyant body according to an embodiment of the present invention; FIG. 2 is a perspective view showing a buoyant body of a buoy comprising a multi-layer laminated foam sheet according to the present invention, FIG. 3 is a partially cutaway perspective view showing a buoyant body of a buoy consisting of a multi-layered laminated foam sheet according to the present invention, Fig. 3 is an exploded perspective view showing a supporting bar of a buoyant body of a buoy comprising a multi-layer laminated foam sheet according to the invention.

2 to 4, the buoyant body 100 of the buoy consisting of the multi-layer laminated foam sheet according to the present invention is composed of the support rod 10, the foam sheet 20, and the surface protection layer 30.

Referring to FIGS. 3 and 4, the support rod 10 is the center of the buoyant body 100 and supports the foam sheet 20 described below. The support rod 10 is rod-shaped. The support rod 10 may be made of a metal material.

The support bar 10 includes an upper fixing plate 11, a lower fixing plate 12, a rotation preventing plate 13, a lighter supporting plate 14, a mooring annular plate 15, and a mooring ring 16.

The upper fixing plate 11 is provided at the upper end of the support rod 10 and the lower fixing plate 12 is provided at the lower end of the support rod 10. A foam sheet 20 is provided between the upper fixing plate 11 and the lower fixing plate 12 and fixedly coupled thereto.

A plurality of rotation preventing plates 13 are provided on the lower side of the support rods 10. For example, the rotation preventing plates 13 may be provided on both sides of the support bar 10, and two of them may be provided. In the present embodiment, two rotation preventing plates 13 are provided, but the present invention is not limited thereto. The rotation preventing plate 13 prevents the foam sheet 20 coupled to the support rod 10 from rotating and is firmly fixed.

The rotation preventing plate 13 is formed by firmly fixing the support rod 10 and the foam sheet 20 by the rotation preventing plate 13 in the process of cutting the outer surface of the foam sheet 20 described below, The release of the foam sheet 20 can be prevented and the outer surface of the foam sheet 20 can be uniformly and flatly cut without causing the support bar 10 to rotate. As a result, the surface protective layer 30 coated on the outer surface of the foam sheet 20 is uniformly coated, and the center of gravity of the buoyant body 100 is not deviated.

The backing plate 14 provided on the upper fixing plate 11 is a portion to which a flat mirror (not shown) provided on the buoyancy body 100 is fixed. The mooring ring plate (15) provided under the lower fixing plate (12) is a portion for fixing the mooring ring (16).

Referring to Figures 2 and 3, the foam sheet 20 can be made of conventional foam, which is widely used in the industry, as a means of providing buoyancy to the buoyant body 100. The foam sheet 20 is multi-layered between the lower fixing plate 12 and the upper fixing plate 11 of the support rod 10. [

The foam sheet 20 includes an upper foam sheet 21, a lower foam sheet 22, a fixing pin 24, and a thickness correction pin 25.

The shape of the lower foam sheet 22 is shown in Figure 6a. This lamination structure of the lower foam sheet 22 is intended to enhance the bonding force between the lower foam sheets 22 to be laminated. That is, in order to prevent the multi-layered laminate structure from collapsing around the cut surface by continuing the cut surfaces of the lower foam sheet 22 having the multi-layers stacked. In FIG. 6A, the lower foam sheet 22 is shown as an example of a fan-shaped plate, but the present invention is not limited thereto.

The lower foam sheet 22 is a part of the foam sheet 20 laminated by a predetermined vertical height. The stack height of the lower foam sheet 22 may vary depending on the shape and size of the buoyant body 100. The lower foam sheet 22 is formed of a plurality of semi-circular or fan-shaped plates, and the cut surfaces are staggered. The lower foam sheet 22 can be obtained by suitably cutting a plate material foam having a predetermined thickness. When the sheet material foams are cut to form individual lower foam sheets 22, the upper and lower adjacent foam sheets 22 are stacked alternately so that the cut surfaces are not continuous.

The lower foam sheet 22 has a plurality of perforation holes 23 formed in its surface. The perforation hole 23 is a portion for guiding the adhesive to easily permeate between the lower foam sheets 22 to be laminated. Such a perforation structure can further enhance the bonding force between the adjacent lower foam sheets 22 .

The upper foam sheet 21 is multi-tiered in a conical shape by a predetermined vertical height at an upper portion of the foam sheet 20. The upper foam sheet 21, as shown in Fig. 7A, is in the shape of a disc and is multi-layered in a conical shape with a decreasing radius toward the top. This is for guiding the buoyant body 100 floating on the sea surface to easily center the center of gravity. In this case, it is not only easy to cut the plate form, but also it is very convenient to laminate the support rod 10.

The upper foam sheet 21 has a plurality of perforations formed in the surface thereof. The perforation hole 23 is a portion for guiding the adhesive to easily permeate between the upper foam sheets 21 to be laminated. Such a perforation structure can further enhance the bonding force between adjacent upper foam sheets 21 .

A plurality of fixing pins (24) are inserted into the lower foam sheet (22). The fixing pin 24 is inserted to fix the lower foam sheet 22 to improve the binding force of the lower foam sheet 22. For example, as shown in Figs. 6C to 6E, when three sheets of the lower foam sheet 22 in the shape of a fan plate are stacked on one layer, the fixing pins 24 can be inserted one by one into the center of each plate, It is not limited to this form.

The fixing pin 24 increases the coupling force between the lower foam sheets 22 and increases the efficiency of the stacking operation of the lower foam sheet 22. [ That is, the fixing pin 24 has the effect of further increasing the bonding force in a state in which the bonding force between the lower foam sheets 22 is increased by the perforation hole 23. Unlike the upper foam sheet 21, the lower foam sheet 22 should be laminated so that a plurality of sheet-like sheets are gathered to form one layer, and the adjacent layers and the cut surfaces are not connected. In this case, the outer diameter may not be uniform. However, since the lower foam sheet 22 is fixed at the correct position by the plurality of fixing pins 24, the shape is easily maintained during the work, There is an increasing effect.

The lower foam sheet 22 is firmly fixed in the process of cutting the outer surface of the foam sheet 20 to prevent the problem of the separation of the foam sheet 20 due to the centrifugal force or the weight being biased downward , And as the outer surface is uniformly cut, the surface protective layer 30 can be evenly coated. That is, the surface protective layer 30 is uniform and the center of gravity is not deviated.

A plurality of thickness correction pins (25) are inserted into the outer surface of the foam sheet (20). The thickness correction pin 25 is in the form shown in FIG. 10C, and a plurality of the thickness correction pins 25 are inserted outside the cut foam sheet 20 as shown in FIGS. 10A and 10B. By the thickness correction pin 25, the following surface protection layer 30 can be coated with a certain thickness. That is, the upper projecting portion 26 of the thickness correcting pin 25 has a size corresponding to the thickness of the surface protective layer 30, and the surface protective layer 30 is formed by the thickness correcting pin 25, .

The surface protection layer 30 is a means for protecting the outer surface of the foam sheet 20. The surface protection layer 30 is made of polyurea. Polyurea is a coating which is dried at a very high speed after treatment and, as is known, is excellent in abrasion resistance and impact resistance as well as adhesive strength, corrosion resistance and acid resistance.

As described above, the buoyant body 100 of the buoy consisting of the multi-layered laminated foam sheet according to the present embodiment includes the rotation preventing plate 13 provided under the support bar 10, the perforation hole (not shown) formed in the foam sheet 20 23 and the fixing pin 24 inserted into the lower foam sheet 22 to improve the bonding force between the foam sheets 20 and prevent the foam sheet 20 from escaping from the foam sheet 20, There is an effect that an easy outer surface cutting of the sheet 20 is possible.

That is, in the process of cutting the outer surface of the foam sheet 20, the support rod 10 and the foam sheet 20 are firmly fixed by the rotation prevention plate 13 and the fixing pin 24, and the lower foam sheet 22 So that the separation of the foam sheet 20 due to centrifugal force can be prevented and the outer surface of the foam sheet 20 can be uniformly and flatly cut. As a result, the surface protective layer 30 coated on the outer surface of the foam sheet 20 is uniformly coated, and the center of gravity of the buoyant body 100 is not deviated.

Further, the bonding force between the lower foam sheets 22 is further enhanced by the perforation holes 23 and the fixing pins 24, and the lower foam sheet 22 can be easily stacked.

Hereinafter, a method of manufacturing a buoyant body of a buoy consisting of a multi-layered laminated foam sheet according to the present embodiment will be described. 5 is a flowchart showing a method of manufacturing a buoyant buoyancy member made of a multi-layer laminated foam sheet according to the present invention.

Referring to FIG. 5, first, the lower fixing plate 12 is fixedly coupled to the lower end of the support rod 10 provided with the rotation prevention plate 13 (S1).

Subsequently, a lower foam sheet 22 of a semicircular plate or a fan-shaped plate having a plurality of perforation holes 23 formed on the surface of the support rod 10 by adhesive is closely stacked from the lower fixing plate 12 to the upper side (S2). Here, the upper and lower adjacent lower foam sheets 22 are stacked such that the cut surfaces are not continuous but staggered with each other. This process is shown in Figs. 6A and 6B. 6A to 6E are views showing a laminated state of a lower foam sheet of a buoyant body of a buoy comprising a multi-layered laminated foam sheet according to the present invention.

As shown in FIG. 6A, the lower foam sheets 22 of the upper and lower adjacent fan-shaped plates are stacked alternately without cutting surfaces, and the lower foam sheets 22 of three fan-shaped plates are laminated on one layer . This can prevent the multi-layer laminated structure of the lower foam sheets 22, which are stacked in layers, from collapsing around the cut surface. And the perforation hole 23 of the lower foam sheet 22, the adhesive can easily penetrate and the bonding force between the adjacent lower foam sheets 22 can be enhanced.

Next, when the lower foam sheet 22 is stacked by a predetermined vertical height, the fixing pin 24 is inserted into the lower foam sheet 22 (S3). As shown in FIGS. 6C and 6D, the fixing pins 24 are inserted into the center of the lower foam sheet 22 of each of the fan-shaped plates to have a shape as shown in FIG. 6E. The fixing force of the lower foam sheet 22 can be improved by the fixing pin 24.

Subsequently, the upper foam sheet 21 of the circular plate on which the plurality of perforation holes 23 are formed on the surface of the lower foam sheet 22 on which the fixing pin 24 is inserted is adhered to the upper end of the support rod 10 And is tightly laminated in a conical shape (S4). This process is illustrated in Figures 7A and 7B. 7A and 7B are views showing the laminated state of the upper foam sheet of the buoyant body of the buoy comprising the multi-layer laminated foam sheet according to the present invention.

As shown in FIGS. 7A and 7B, the upper foam sheet 21 is stacked on the lower foam sheet 22 in a conical shape with a decreasing radius toward the upper side. Due to the perforation hole 23 of the upper foam sheet 21, the adhesive can easily penetrate and the bonding force between adjacent upper foam sheets 21 can be enhanced.

Through these processes, the upper and lower foam sheets 21 and 22 are stacked at a predetermined vertical height from the lower fixing plate 12 of the support rod 10 and have a multi-layered structure. As described above, the present embodiment proposes a method of cutting a plate material foam to be produced to a predetermined size and then stacking the same in a multi-stage manner, so that a buoyancy structure of any shape can be implemented very easily, It is easy to implement large buoyancy bodies that are impossible.

In addition, in the multi-layer lamination of individual foam sheets obtained through cutting, each end of the lower foam sheet 22 in the lower portion is not constituted of one foam sheet, but is formed of a plurality of at least two or more sheets, The stability of the lower portion of the buoyant body 100, which is the most important part for generating the buoyant force in the buoyant body 100, can be remarkably improved by performing the bonding treatment through the perforation hole 23 .

Next, the upper fixing plate 11 is fixedly coupled to the upper end of the support rod 10, and the upper foam sheet 21 and the lower foam sheet 22 are tightly fixed to the support rod 10 (S5). FIG. 7B shows the upper fixing plate 11 fixedly coupled with this process.

Subsequently, the outer surface of the foam sheet 20 is cut with a heat generating means 41 such as a hot wire of the cutting device 40 (S6). Through this process, the shape and dimensions of the buoyant body 100 may be met. The cutting device 40 is shown in Fig. 8 is a view showing a state in which a foam sheet of a buoyant body made of a multi-layer laminated foam sheet according to the present invention is cut with a cutting device. 8, both ends of the support rod 10 are fixed to the rotary shaft of the cutting device 40, and then the driving means is operated to cut the outer surface of the foam sheet 20 while rotating the support rod 10. 8 shows a case where cutting is performed while the support rod 10 is held horizontally. Alternatively, the support rod 10 may be cut while maintaining the vertical state.

The driving of the cutting apparatus 40 will be described with reference to Figs. 9A and 9B. 9A and 9B are views showing a cutting device used for manufacturing a buoyant buoyancy member made up of a multi-layer laminated foam sheet according to the present invention. 9A and 9B, the cutting apparatus 40 includes a heat generating unit 41, a tension device 50, and a control unit (not shown).

A nichrome wire is used as the heating wire used as the heat generating means 41. Nichrome is an alloy of Ni-Cr. Because it has high heat resistance and corrosion resistance, it is widely used for heating wires or heat-resistant parts such as wire and bar. The tension device (50) keeps the tension acting on the heat generating means (41) constant. The control unit controls the heat generating means 41 and the tension device 50. [

The tension device 50 includes a body 51, a rod 52, a stainless steel wire 53, a load cell 54, a cell 55, a spring 56, and a stepping motor 57. The rod 52 is connected to the heat generating means 41 and penetrates the upper part of the body 51. The stainless steel wire 53 is connected to the rod 52 and penetrates the lower portion of the body 51. The load cell 54 is provided in the lower part inside the body 51, and the cell 55 is provided in the upper part inside the body 51. The spring 56 is provided to surround the rod 52 and the stainless steel wire 53 between the cell 55 and the load cell 54. The stepping motor 57 is connected to the stainless steel wire 53.

The load cell 54 detects the compression load of the spring 56 and controls the stepping motor 57 to the control unit. The rod 52 and the cell 55 are joined together in a bolt-and-nut configuration. The upper part of the body 51 and the cell 55 are located with a certain space, and the spring 56 is arranged to generate a constant compressive load.

The driving principle of the tension device 50 is as follows. Heat is generated in the heat generating means 41, and tension is generated. As a result, the rod 52 and the cell 55 are lifted up and the spring 56 is stretched, so that the compression force of the spring 56 is weakened and the load transmitted to the load cell 54 is lowered. When the load of the load cell 54 is lowered, the stepping motor 57 is driven through the control unit to pull the stainless steel wire 53. Here, when the set load is applied to the load cell 54, the stepping motor 57 is stopped. On the other hand, since the length of the heat generating means 41 varies depending on the total length of the heat generating means 41, the length of the rod 52 is varied.

Next, the outside of the cut foam sheet 20 is woven with a woven net (S7). The foam sheet 20 whose outer surface has been cut with the cutting device 40 is wound into a woven net to enhance its bonding force.

Subsequently, a plurality of thickness correction pins 25 are inserted outside the foam sheet 20 and coated with polyurea to manufacture a buoy (S8). The protrusion 26 of the thickness correction pin 25 has a size corresponding to the thickness of the surface protective layer 30 coated with polyurea and the thickness of the surface protective layer 30 is set to a certain thickness Lt; / RTI > By the surface protection layer 30, the foam sheet 20 is completely isolated from the outside, and the inside of the buoyant body 100 floating on the sea surface can be safely protected.

On the other hand, the buoyant body of the buoy consisting of the multi-layer laminated foam sheet according to the present embodiment and the manufacturing method thereof are not limited to the above-described embodiment, and various modifications can be made without departing from the technical spirit of the present invention. It will be readily apparent to those skilled in the art to which the present invention pertains.

100; A buoyancy member of a buoy consisting of a multi-layer laminate foam sheet
10; Support bar
11, 12; Fixed plate
13; Anti-rotation plate
14; Lighthouse Stand
15; Mooring ring plate
16; Mooring ring
20, 21, 22; Foam sheet
23; Perforated hole
24; Fixing pin
25; Thickness correction pin
30; Surface protective layer
40; Cutting device
41; Heating means
50; Tension device
51; body
52; road
53; Stainless steel wire
54; Load cell
55; Cell
56; spring
57; Stepping motor

Claims

A support rod including a plurality of anti-rotation plates provided on the lower side surface of the upper and lower fixing plates;
A lower foam sheet laminated in multiple stages between a lower fixed plate and an upper fixed plate of a support rod, the lower foam sheet being formed of a plurality of semi-circular or fan-shaped plates at a lower portion thereof and having cut surfaces alternately stacked, A foam sheet having an upper foam sheet having a plurality of perforation holes formed on a surface thereof, a plurality of fixing pins inserted into the lower foam sheet, and a plurality of thickness correction pins inserted into the outer surface;
And a surface protective layer of a polyurea material applied to an outer surface of the foam sheet.

A first step of fixing a lower fixing plate to a lower end of a support rod provided with a rotation prevention plate;
A lower foam sheet of a semi-circular plate or a fan-shaped plate having a plurality of perforated holes formed on its surface by using an adhesive to the support rod is closely stacked from the lower fixing plate to an upper portion thereof, A second step of laminating stacked layers;
A third step of closely laminating an upper foam sheet of an original plate having a plurality of perforated holes formed on its surface to an upper end of the support bar in a conical shape using an adhesive on the lower foam sheet;
A fourth step of fixing the upper foam sheet and the lower foam sheet to the support bar by fixing an upper fixed plate to the upper end of the support rod;
A fifth step of rotating both ends of the support rod in a fixed state and cutting the outer surface of the upper and lower foam sheets by a heating means such as a hot wire provided in the cutting device to adjust the shape and dimensions;
A sixth step of desiring the outside of the cut foam sheet as a woven net to increase the bonding force of the foam sheet; And
And a seventh step of inserting a plurality of thickness correction fins into the outside of the foam sheet and coating the outer surface with polyurea to manufacture a buoy.

[3] The apparatus according to claim 2,
Wherein the buoyant body is a nichrome wire.

3. The method according to claim 2,
Further comprising the step of inserting a plurality of fixing pins from the upper side to the lower side of the laminated lower foam sheet to improve the bonding force.

3. The method of claim 2,
A heating device such as a heating wire for cutting the outer surface of the foam sheet, a tension device for keeping the tension acting on the heating device constant, and a control device for controlling the heating device and the tension device Of the buoyant body.

6. The method of claim 5,
The tension device includes a body, a rod connected to the heating unit and passing through the upper part of the body, a stainless steel wire connected to the rod and passing through the lower part of the body, a load cell provided at the lower part inside the body, A spring provided to surround the rod and the stainless steel wire between the cell and the load cell, and a stepping motor connected to the stainless steel wire,
When a tension is generated in the heat generating means, the rod and the cell are lifted upward, the spring is extended, the compression force of the spring is weakened, and the load transmitted to the load cell is lowered so that the stepping motor is driven Wherein the tensioning device is driven by pulling the stainless steel wire and stopping the stepping motor when a set load is applied to the load cell.