Hull cleaning brush

Abstract

The present invention relates to a hull cleaning brush. The hull cleaning brush of the present invention is a hull cleaning brush for removing dirt from the surface of a hull, and comprises a base material, a fixing part connected to the lower end of the base material and having a fixing protrusion protruding from the outside of the base material, and a rotating body part having at least one fixing groove into which the fixing part connected to the base material is inserted, and is characterized in that the base material is replaceable.

Description

[Technical Field]

[0001] The present invention relates to a cleaning brush for a ship hull, and more particularly to a cleaning brush for a ship hull that rotates a base material and removes substances attached to the surface of the hull, including marine organisms such as slime, seaweed, barnacles, and mussels, by using pressure and friction caused by the rotation. [Background technology]

[0002] Even for newly built ships, the moment they come into contact with seawater, various marine organisms attach to the surface of the underside of the hull (hereinafter referred to as the "hull surface").Depending on the amount of marine organisms that attach to the hull surface, from slime to seaweed, barnacles, and mussels, cleaning the hull surface is essential as it can slow the ship's sailing speed and increase fuel costs by 10 to 30%.

[0003] To prevent marine organisms from attaching to the surface of a ship, antifouling paint is applied to the surface, but this only delays the time it takes for marine organisms to attach. After about a year, organisms such as barnacles and mussels, which greatly increase water resistance, form colonies and attach to the surface of the ship.

[0004] To remove marine life attached to the surface of the hull, divers and ship cleaning robots were cleaning the surface of the hull using cleaning brushes that rotate automatically with a motor.

[0005] Conventional ship cleaning brushes are roughly divided into a disk type in which a filament-type base material is provided on one surface of a rotating disk, and a roller type in which a filament-type base material is provided on the surface of a long rotating cylinder.

[0006] In addition, the degree of biological fouling on the hull surface can be arbitrarily divided into four levels as follows (here, high levels include low levels of biological fouling): 1st stage: Slime or Moss Stage 2: Seaweed Stage 3: A small colony of hard-shelled organisms Stage 4: Large colonies of hard-shelled organisms

[0007] In order to minimize biological contamination of the hull surface and damage to the antifouling paint, soft cleaning brushes made only of plastic base material, middle cleaning brushes made of a mixture of metal and plastic base material, and hard cleaning brushes made only of metal base material were selectively used.

[0008] For example, the hard cleaning brush is used when biological contamination is at level 4 and there is almost no antifouling paint remaining, the medium cleaning brush is used when biological contamination is at level 3 and it is not a problem if the antifouling paint is severely damaged, and the soft cleaning brush is used when biological contamination is at levels 1 and 2 and causes very little damage to the antifouling paint during cleaning.

[0009] Since repainting antifouling paint is time-consuming and expensive, it is important to use the antifouling paint for as long as possible. To ensure the longevity of antifouling paint, cleaning brushes that can minimize damage to the antifouling paint when cleaning the hull surface are particularly necessary for biological fouling stages 1 to 3.

[0010] In order to easily remove organisms with hard shells in the three stages of biological contamination, a weak impact can be applied to the top of the shell rather than the bottom. A hard base material must be used to apply a weak impact, but conventional filament-type base materials have the problem that the tip of the base material makes point contact and scratches the antifouling paint, causing damage.

[0011] In addition, conventional filament-type substrates were manufactured by implanting them on the surface of a rotating disk or rotating cylinder, but when the substrate became worn and needed to be replaced, there was a problem in that it was necessary to use specialized equipment to remove the worn substrate and re-implant it.

[0012] Therefore, there is a demand for a hull cleaning brush that can handle various types of fouling on the hull surface, minimizes damage to antifouling paint during cleaning, and allows for easy replacement of the base material. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Korean Patent Registration No. 10-2204694 Summary of the Invention [Problem to be solved by the invention]

[0014] Therefore, the present invention is intended to solve these conventional problems, and aims to provide a hull cleaning brush that can be easily attached by inserting a fixing part coupled to a base material into a fixing groove in a rotating body part, thereby making it possible to attach the base material to the rotating body part, and that uses a block-type base material instead of a filament-type base material to minimize damage to the antifouling paint during cleaning, and that can be easily attached by mixing base materials of various shapes or materials.

[0015] The problems to be solved by the present invention are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0016] The above object can be achieved by a hull cleaning brush according to the present invention for removing dirt from the surface of a hull, comprising: a base material; a fixing part connected to the lower end of the base material and having a fixing protrusion protruding from the outside of the base material; and a rotating rotor part having at least one fixing groove into which the fixing part connected to the base material is inserted, wherein the base material is replaceable.

[0017] Here, the rotating body portion may be formed in a disk shape, and the fixing portion connected to the base material may be inserted radially inward from the side of the disk so that the base material protrudes from the top surface of the disk, and the fixing groove may be formed in a shape in which the side portion and top surface of the rotating body portion are open.

[0018] Here, the rotating body portion may be formed in a cylindrical shape, and the fixing portion connected to the base material may be inserted in the height direction of the cylinder from either the upper or lower surface of the cylinder so that the base material protrudes from the outer surface of the cylinder, and the fixing groove may be formed in a shape in which one edge and the outer surface of at least one of the upper or lower surfaces of the rotating body portion cylinder are open.

[0019] Here, the fixing groove may be formed in a cross shape with a fixing protrusion insertion groove into which the fixing protrusion is inserted in the insertion direction of the fixing part connected to the base material, and a base material insertion groove into which the lower end of the base material is inserted.

[0020] Here, the base material may be formed in a block shape or may be formed by stacking a plurality of plate materials.

[0021] Here, at least one through hole may be formed in the lower end of the base material, and the fixing portion may be inserted into the hole to form fixing protrusions that protrude from both sides of the hole.

[0022] Here, the fixing portion may be formed from a rod-shaped first frame and at least one rod-shaped second frame extending in a direction perpendicular to the first frame, inserted into the hole, and protruding from the outside of the base material.

[0023] Here, the base material may be made of either polyurethane or nylon.

[0024] Here, the device may further include a strip brush including a base material having a symmetrically bent shape, a rim surrounding the bent lower end of the base material, and a core pressing against the inside of the bent portion of the base material, and the fixing portion may be connected to the lower end of the strip brush.

[0025] Here, the fixing portion may surround the outside of the rim, and the upper end portion may include a storage portion that is bent from the top of the rim, and the fixing protrusions may protrude on both sides from the outer surface of the storage portion.

[0026] Here, the strip brush may be a filament type strip brush or a sponge type strip brush.

[0027] Here, the fixing portion may be formed separately on the left and right sides.

[0028] Here, base materials of different shapes or different materials may be inserted into each of the plurality of fixing grooves.

[0029] Here, base materials of different shapes or different materials may be inserted along the insertion direction of the fixing groove.

[0030] Here, the surface of the base material may be coated with a powder having high hardness.

[0031] Here, the base material may be formed by including a powder having high hardness.

[0032] Here, the powder may be made of carbon or metal. [Effects of the Invention]

[0033] The hull cleaning brush of the present invention as described above has the advantage that the base material can be easily replaced and attached.

[0034] Another advantage is that the use of a base material made of a hard, flexible material in the form of a block or stack of planks minimizes damage to the antifouling paint when cleaning the hull surface.

[0035] Furthermore, base materials of various shapes or materials, such as block-type base materials and strip brush-type base materials, can be replaced and installed in various combinations, which has the advantage that the hull surface can be cleaned without replacing the base material regardless of the level of biological contamination. [Brief explanation of the drawings]

[0036] [Figure 1]1 is a perspective view of a hull cleaning brush according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the base material in FIG. 1. [Figure 3] 10(a) and 10(b) are perspective views showing the connection relationship between the fixing parts for the block-type base material and the plate-type base material, respectively. [Figure 4] FIG. 10 is a perspective view of a hull cleaning brush according to a second embodiment of the present invention. [Figure 5] FIG. 5 is an exploded perspective view of the base material in FIG. 4. [Figure 6] FIG. 10 is a perspective view of a hull cleaning brush according to a third embodiment of the present invention. [Figure 7] FIG. 7 is an exploded perspective view of the strip brush in FIG. 6. [Figure 8] 10A and 10B are a perspective view and a side view showing the state in which the filament-type strip brush and the fixed portion are joined together. [Figure 9] 9A and 9B are a perspective view and a side view showing the state in which the filament-type strip brush and the fixing part are separated from each other in FIG. 8. FIG. [Figure 10] FIG. 8 is a perspective view and a side view showing a modified example of the filament type strip brush, illustrating the state in which the sponge type strip brush and the fixing portion are joined together. [Figure 11] 10A and 10B are an exploded perspective view and an assembled view of a boat hull cleaning brush according to a fourth embodiment of the present invention. [Figure 12] 12A and 12B are an exploded perspective view and an assembled view showing a modification of FIG. 11. DETAILED DESCRIPTION OF THE INVENTION

[0037] Specific details of the embodiments are included in the detailed description and drawings.

[0038] The advantages, features, and methods for achieving the same of the present invention will become clearer by reference to the following detailed embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and can be realized in various forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to allow those skilled in the art to fully understand the scope of the invention. The present invention is defined solely by the claims. Like reference numerals refer to like elements throughout the specification.

[0039] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings for explaining a cleaning brush for a boat hull according to an embodiment of the present invention.

[0040] FIG. 1 is a perspective view of a hull cleaning brush according to a first embodiment of the present invention, FIG. 2 is a perspective view in which the base material in FIG. 1 is separated, and FIGS. 3(a) and 3(b) are perspective views showing the connection relationship between fixing parts for a block-type base material and a plate-type base material, respectively.

[0041] The hull cleaning brush according to the first embodiment of the present invention may be configured to include a base material 120, a fixed portion 130, and a rotating body portion 110.

[0042] The rotating body 110 receives power from a motor (not shown) to rotate, and at least one base material 120 is fixed to the rotating body 110. In this embodiment, the rotating body 110 is formed in a circular disk shape having a predetermined thickness, and the base material 120 may be coupled to the disk-shaped rotating body 110 so that it protrudes from the upper surface of the disk-shaped rotating body 110.

[0043] As shown, the rotating body 110 may have a coupling hole 112 formed at its center into which a motor shaft or a rotating shaft that rotates upon receiving power from a motor is inserted and coupled.

[0044] The rotating body 110 may have at least one fixing groove 116 formed therein to which the base material 120 is coupled. More specifically, as will be described later, the base material 120 may be coupled to the fixing part 130, and the fixing part 130 to which the base material 120 is coupled may be inserted into the fixing groove 116 and coupled to the rotating body 110.

[0045] In this embodiment, the fixing groove 116 may be formed in a shape that opens at the upper end and top surface of the side of the rotating body 110 so that the fixing part 130 coupled to the base material 120 is inserted into the fixing groove 116 from the upper end of the side of the rotating body 110 and the base material 120 protrudes from the top surface of the rotating body 110. In this case, as will be described later, the base material 120 may be formed in the shape of an elongated block having a predetermined thickness, and therefore the fixing groove 116 may extend long inward in the radial direction of the rotating body 110.

[0046] The base material 120 is coupled to the rotating body 110, and removes substances adhering to the surface of the hull by applying pressure or friction as the rotating body 110 rotates. As shown in FIG. 3(a), in this embodiment, the base material 120 may be formed in a block shape. It may be formed as a rectangular parallelepiped block that is elongated in one direction and has a predetermined height and thickness, and the shape of the block is not limited to the shape shown in the figure. Alternatively, as shown in FIG. 3(b), multiple plate-shaped base materials 120a may be stacked to form a block shape like that shown in FIG. 3(a).

[0047] In the case of conventional filament-type base materials, in order to easily remove deposits with hard shells of biological contamination level 3 or higher, a hard base material 120 had to be used, but in that case, there was a problem that the edge of the base material 120 would scratch and easily damage the antifouling coating due to point contact. Therefore, in the present invention, by forming the base material 120 into a block shape as shown in Figure 3, line contact or surface contact is made, and even if a hard base material 120 is used, damage to the antifouling coating during cleaning can be minimized.

[0048] In this embodiment, the base material 120 is preferably made of a material that is hard and flexible when a force is applied. For example, the base material 120 may be made of polyurethane or nylon, but is not limited to these. If necessary, the base material 120 may be made of a metal material or may contain metal to remove four levels of biological contamination.

[0049] The fixing part 130 may be coupled to the lower end of the base material 120 and may have a fixing protrusion protruding from the outside of the base material 120. The fixing part 130 coupled to the base material 120 may be inserted into the fixing groove 116 of the rotating body part 110 described above and fixed thereto.

[0050] At least one through hole 122 may be formed at the lower end of the base material 120, and the fixing portion 130 may be inserted into the through hole 122 to join the base material 120, and fixing protrusions may be formed protruding from both sides of the through hole 122.

[0051] In this embodiment, the fixing part 130 may be formed from a rod-shaped first frame 131 and at least one second frame 132 extending in a rod shape in a direction perpendicular to the first frame 131. The multiple second frames 132 may be formed at regular intervals, or the base material 120 may have at least one through hole 122 formed at the lower end thereof, through which the second frame 132 is inserted. In this case, the number of second frames 132 may be greater than the number of through holes 122 formed in the base material 120. In this case, the base material 120 may be joined at any position selected on the fixing part 130, or multiple base materials 120 may be joined to a single fixing part 130.

[0052] When the second frame 132 of the fixing part 130 is inserted into the through-hole 122 of the base material 120 for coupling, an end of the second frame 132 protrudes from the outside of the base material 120, and the protruding end of the second frame 132 may form a fixing protrusion. Also, when the fixing part 130 is coupled to the base material 120, the first frame 131 protrudes from the outside of the base material 120, and the first frame 131 may form a fixing protrusion on the opposite side.

[0053] 2, the fixing grooves 116 formed in the rotating body part 110 may be formed in a cross shape, with fixing protrusion insertion grooves 114 into which the fixing protrusions on both sides are inserted and base material insertion groove 115 into which the lower end of the base material 120 is inserted, in the direction (radially inward direction) into which the fixing part 130 coupled to the base material 120 is inserted. Here, a plurality of fixing grooves 116 are formed along the circumferential direction of the disk-shaped rotating body part 110, and a plurality of base materials 120 can be coupled.

[0054] Although not shown, a locking portion (not shown) may be formed to close the side surface of the fixing groove 116 in order to prevent the fixing portion 130 coupled to the base material 120 from slipping out in the opposite direction after being inserted into the fixing groove 116. The locking portion may be formed in the shape of a cap that covers the outer surface of the rotating body portion 110 so as to close the side surfaces of the multiple fixing grooves 116 in the circumferential direction.

[0055] As described above, in the hull cleaning brush according to the present invention, the fixing part 130 connected to the base material 120 is inserted into the fixing groove 116 for connection, so that when the base material 120 wears out during use and needs to be replaced with a new base material 120, the base material 120 can be easily replaced and attached.

[0056] FIG. 4 is a perspective view of a hull cleaning brush according to a second embodiment of the present invention, and FIG. 5 is an exploded perspective view of FIG. 4 with the base material separated.

[0057] In this embodiment, differences from the first embodiment will be mainly described.

[0058] In this embodiment, the rotating body 110 is formed in a cylindrical shape, and the base material 120 may be formed to protrude from the outer surface of the cylinder. Therefore, in this embodiment, the fixing groove 116 may be formed by inserting the fixing portion 130 coupled to the base material 120 in the height direction of the cylinder from either the upper or lower surface of the cylinder so that the base material 120 protrudes from the outer surface of the cylinder of the rotating body 110, or the fixing groove 116 may be formed in a shape in which at least one edge of the upper or lower surface of the cylinder of the rotating body 110 and the outer surface of the cylinder are open. In the drawings, the fixing groove 116 is formed in a shape in which both the upper and lower surfaces of the cylinder are open, but it may also be formed in a shape in which one side is closed.

[0059] A plurality of fixing grooves 116 are formed at intervals in the circumferential direction, and a plurality of base materials 120 may be coupled to the cylindrical outer surface of the rotating body portion 110 along the circumferential direction.

[0060] Figure 6 is an oblique view of a hull cleaning brush according to a third embodiment of the present invention, Figure 7 is a separated oblique view of the strip brush in Figure 6, Figure 8 is an oblique view and a side view showing the combined state of the filament-type strip brush and the fixed part, Figure 9 is an oblique view and a side view showing the separated state of the filament-type strip brush and the fixed part in Figure 8, and Figure 10 is an oblique view and a side view of a modified filament-type strip brush in Figure 8, showing the combined state of the sponge-type strip brush and the fixed part.

[0061] In this embodiment as well, differences from the previous embodiment will be mainly described.

[0062] In this embodiment, the base material 120 is not joined to the fixing part 130 alone, but forms a strip brush 125 together with a rim 123 and a core 124. As shown in the side views of Figures 7 and 8, the base material 120 may be bent symmetrically, with the rim 123 surrounding the bent lower end of the base material 120 and the core 124 pressing downward on the bent inside of the base material 120 to form the strip brush 125. In this case, as shown in the figures, multiple base materials 120 may be folded in an overlapping manner.

[0063] The base material 120 may be cut in multiple vertical directions on both sides of the bent portion in the width direction to form a filament-type strip brush 125. Alternatively, as shown in Fig. 10, it may be formed as an uncut sponge-type strip brush 125. In this case, it is preferable that both sides of the base material 120 of the sponge-type strip brush 125 are formed so that they become thicker toward the opposite side of the bent portion.

[0064] The base material 120 constituting the strip brush 125 is preferably made of a softer material than the block-type base material 120. Therefore, this embodiment can be effectively used for cleaning biological contamination in stages 1 and 2.

[0065] The fixing part 130 may be coupled to the lower end of the strip brush 125. Preferably, as shown in the drawings, a receiving part 133 that surrounds the outside of the rim 123 and has an upper end that is bent from the top of the rim 123 toward the bristles may be coupled to the lower end of the strip brush 125. Fixing protrusions 134 may be formed protruding from both the left and right sides of the receiving part 133. In the drawings, the fixing protrusions 134 are formed at the lowest ends of the left and right sides, but this is not necessarily limited thereto, and the fixing protrusions 134 may be formed protruding from the middle.

[0066] In this case, the fixing portion 130 may be formed separately into left and right halves as shown in the figure. If the fixing portion 130 is formed as a single unit, it is difficult to insert the lower end of the strip brush 125 into the accommodating portion 133 of the fixing portion 130. In contrast, by forming the fixing portion 130 separately into left and right halves, it is possible to easily insert the lower end of the strip brush 125 into the accommodating portion 133.

[0067] The rotor part 110 has the fixing groove 116 as described above, and the fixing part 130 to which the strip brush 125 is attached is inserted into the fixing groove 116, so that the strip brush 125 can be easily replaced and attached.

[0068] Although the drawings show a shape in which the strip brush 125 is attached to the side of a cylinder, it may also be formed in a structure in which the strip brush 125 is attached to a circular disk-shaped rotating body part 110, as shown in Figures 1 and 2.

[0069] FIG. 11 is an exploded perspective view and an assembled view of a hull cleaning brush according to a fourth embodiment of the present invention, and FIG. 12 is an exploded perspective view and an assembled view showing a modified example of FIG.

[0070] In this embodiment, as shown in Fig. 11, base materials 120 of different shapes or different materials described with reference to Figs. 1 to 10 may be inserted into each of the multiple fixing grooves 116. The block-type base materials 120 described with reference to Figs. 1 to 5 or the strip brush 125-type base materials 120 described with reference to Figs. 6 to 10 may be arranged in different positions in each of the multiple grooves arranged in the circumferential direction. Alternatively, as shown in Fig. 12, base materials 120 of different shapes or different materials may be inserted into a single fixing groove 116 along the insertion direction.

[0071] In this case, for biological contamination level 1, a strip brush 125-type base material 120 made of a soft material can be used to remove deposits without damaging the antifouling coating, while for biological contamination levels 2 and 3, a block-type base material 120 made of a hard material can be used to remove deposits without damaging the antifouling coating. Furthermore, for biological contamination level 4, a block-type base material 120 made of a metal or a metal material can be used to remove deposits while minimizing damage to the antifouling coating. Therefore, according to this embodiment, base materials 120 of various shapes can be attached to the rotating body 110, and deposits can be removed with a single cleaning brush without using separate cleaning brushes depending on the type of contamination.

[0072] In addition, in the present invention, to improve the cleaning performance of the first stage of biological contamination, the surface of the base material 120 may be coated with a powder of a hard carbon or metal material. Alternatively, the base material 120 may be manufactured by mixing powder of a hard carbon or metal material. If such powder is mixed or coated on a material with a hard and smooth surface, such as urethane or filament, used in the block-shaped base material 120, or a material with a resilient and soft surface, such as a sponge, the surface becomes rough, thereby improving the cleaning performance of the first stage of biological contamination, such as slime.

[0073] The scope of the present invention is not limited to the above-described embodiments, but can be embodied in various forms within the scope of the accompanying claims. A person skilled in the art to which the present invention pertains will regard the present invention as belonging to the scope of the claims to the extent that any person can modify it without departing from the gist of the present invention as claimed in the claims. [Explanation of symbols]

[0074] 110 Rotating body part 112 Binding hole 114 Fixing protrusion insertion groove 115 Base material insertion groove 116 Fixed groove 120 Base material 122 Through hole 123 rims 124 cores 125 Strip Brush 130 Fixed part 131 First Frame 132 Second Frame 133 Storage Unit 134 Fixed protrusion

Claims

1. A hull cleaning brush for removing dirt from the hull surface, A base material and a fixing portion coupled to a lower end of the base material and having a fixing protrusion protruding from the outside of the base material; a rotating body portion having at least one fixing groove into which a fixing portion coupled to the base material is inserted, The base material is replaceable and formed in a block shape or formed by stacking a plurality of plate materials, and at least one through hole is formed in the lower end of the base material, and the fixing part is inserted into the hole, and fixing protrusions protruding from both sides of the hole are formed. A cleaning brush for a ship hull.

2. 2. The hull cleaning brush according to claim 1, wherein the rotating body portion is formed in a disk shape, the fixing portion connected to the base material is inserted radially inward from the side of the disk so that the base material protrudes from the top surface of the disk, and the fixing groove is formed in a shape in which the side portion and top surface of the rotating body portion are open.

3. 2. A hull cleaning brush as described in claim 1, wherein the rotating body portion is formed in a cylindrical shape, the fixing portion connected to the base material is inserted in the height direction of the cylinder from either one of the upper or lower surfaces of the cylinder so that the base material protrudes from the outer surface of the cylinder, and the fixing groove is formed in a shape in which one edge and the outer surface of at least one of the upper or lower surfaces of the cylinder of the rotating body portion are open.

4. 2. The hull cleaning brush according to claim 1, wherein the fixing groove is formed in a cross shape by a fixing protrusion insertion groove into which the fixing protrusion is inserted in the insertion direction of the fixing part connected to the base material, and a base material insertion groove into which the lower end of the base material is inserted.

5. The fixing portion is 2. The hull cleaning brush according to claim 1, which is formed from a rod-shaped first frame and at least one rod-shaped second frame extending in a direction perpendicular to the first frame, inserted into the hole, and protruding from the outside of the base material.

6. 2. The boat hull cleaning brush according to claim 1, wherein the base material is formed from either polyurethane or nylon.

7. The strip brush further includes a base material having a symmetrically bent shape, a rim surrounding the bent lower end of the base material, and a core pressing against the bent inner side of the base material, The boat hull cleaning brush according to claim 1 , wherein the fixing portion is connected to a lower end of the strip brush.

8. The fixing portion surrounds the outside of the rim, and the upper end portion includes a receiving portion that is bent from the upper portion of the rim, 8. The boat hull cleaning brush according to claim 7, wherein the fixing projections project from both sides from the outer surface of the accommodating portion.

9. 8. The boat hull cleaning brush according to claim 7, wherein the strip brush is a filament type strip brush or a sponge type strip brush.

10. 10. The boat hull cleaning brush according to claim 9, wherein the fixing portion is formed separately on the left and right sides.

11. 2. The ship hull cleaning brush according to claim 1, wherein base materials of different shapes or different materials are inserted into each of the plurality of fixing grooves.

12. 2. The ship hull cleaning brush according to claim 1, wherein base materials of different shapes or different materials are inserted along the insertion direction of the fixing groove.

13. 2. The ship hull cleaning brush according to claim 1, wherein the surface of said base material is coated with a powder having high hardness.

14. 2. The boat hull cleaning brush according to claim 1, wherein the base material is formed by containing a powder having a high hardness.

15. 15. A ship hull cleaning brush according to claim 13 or 14, wherein the powder is made of carbon or metal.

Images