JP2011121388A - Method for preventing attachment of marine organisms to marine propeller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preventing attachment of marine organisms to a marine propeller in order to reduce costs for cleaning the propeller. <P>SOLUTION: The method for preventing attachment of the marine organisms to the marine propeller includes a step S11 of applying disassemblable resin to the propeller; and a step S13 of removing the disassemblable resin from the propeller. In the step of applying the disassemblable resin, the disassemblable resin is applied to the entirety of the propeller. The step of removing the disassemblable resin includes stripping the disassemblable resin from the propeller by the force of water flow generated by rotating the propeller. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for preventing marine organism adhesion to a marine propeller.

  Large ships are outfitted in a state of floating on the sea after the hull is assembled at the construction dock. During the outfitting period, sea creatures such as barnacles and mussels attach to the ship's propellers. In order to reduce the efficiency of the propeller, the attached marine life is cleaned by removing the propeller before commissioning of the ship (sea trial). If the final dock is not performed, the cost will be incurred because the diver cleans the propeller at the end of the outfitting period. Furthermore, during the cleaning by the diver, it is necessary to stop the seawater pump of the ship and stop the equipment adjustment operation of the engine room in order to ensure safety, so the outfitting period becomes longer. When the trial run is over and the ship is delivered to the shipowner and starts operation, the propeller will not stop for a long time. Therefore, it is difficult for marine organisms to adhere to the propeller after the start of operation.

  Patent Document 1 discloses a propeller cover that prevents a shell such as a barnacle from adhering to a propeller of a small ship when a small ship such as a cruiser is moored on the sea in a seawater region. The propeller cover is made of plastic and prevents the attachment of shellfish by blocking the flow of seawater.

  Patent Document 2 discloses a method for preventing the adhesion and propagation of marine organisms by providing a propeller with a marine organism preventing paint or marine organism preventing polymer, and a substance that gradually dissolves from the marine organism preventing paint or marine organism preventing polymer in seawater. is doing.

JP 9-249193 A Japanese Utility Model Publication No. 62-6097

  It is an object of the present invention to provide a method for preventing the attachment of marine organisms to a marine propeller, in which the cost for propeller cleaning is reduced.

  The means for solving the problem will be described below using the numbers used in the (DETAILED DESCRIPTION). These numbers are added to clarify the correspondence between the description of (Claims) and (Mode for Carrying Out the Invention). However, these numbers should not be used to interpret the technical scope of the invention described in (Claims).

  The method for preventing marine organism adhesion to a marine propeller according to the present invention includes a step of applying a dismantleable resin (30) to the propeller (20) (S11, S22), and a step of removing the dismantable resin from the propeller ( S13, S25).

  The step of removing the demountable resin includes a step of peeling the demountable resin from the propeller by rotating the propeller with a force of water flow.

  In the step of applying the demountable resin, the demountable resin is applied to the entire propeller.

  The method for preventing adhesion of marine organisms to the marine propeller further includes a step (S21) of covering the blade (22) of the propeller with a bag (40) and a step of removing the bag from the blade (S24). In the step of applying the demountable resin, the demountable resin is applied to a portion (21) of the propeller that is not covered with the bag.

  The step of covering the blade with the bag includes the step of covering the blade with the bag and the step of closing the gap between the mouth (43) of the bag and the blade with a waterproof tape (50).

  The step of applying the demountable resin includes the step of spraying the demountable resin on the propeller using a coating air gun.

  The decomposable resin is provided by mixing A liquid and B liquid. The coating air gun includes a mixing nozzle that mixes and blows out the liquid A and the liquid B.

  The decomposable resin is a jelly-like resin that remains soft and tacky after curing.

  ADVANTAGE OF THE INVENTION According to this invention, the marine organism adhesion prevention method to the ship propeller by which the expense for propeller cleaning is reduced is provided.

FIG. 1 is a flowchart of a method for preventing marine organism adhesion to a marine propeller according to a first embodiment of the present invention. FIG. 2 is a side view of the hull to which the marine organism adhesion preventing method to the marine propeller according to the first embodiment is applied. FIG. 3 is a flowchart of a method for preventing marine organism adhesion to a marine propeller according to a third embodiment of the present invention. FIG. 4 shows a bag used in the marine organism adhesion preventing method for a marine propeller according to the third embodiment. FIG. 5 shows a propeller to which a marine organism adhesion preventing method for a marine propeller according to a third embodiment is applied.

  With reference to the attached drawings, a mode for carrying out a method for preventing adhesion of marine organisms to a marine propeller according to the present invention will be described below.

(First embodiment)
Referring to FIG. 1, the marine organism adhesion preventing method for a marine propeller according to the first embodiment of the present invention includes a step S11 for applying a dismantleable resin to the propeller, a step S12 for floating the hull in water, Step S13 for removing the dismantleable resin is provided.

  With reference to FIG. 2, step S11 of applying a dismantleable resin to the propeller will be described. FIG. 2 shows the hull 10 assembled in a construction dock. A propeller 20 for propulsion is provided at the stern portion of the hull 10. The propeller 20 is coupled to a shaft 15 protruding from the hull 10. The propeller 20 includes a boss 21 and a plurality of blades 22. The step S11 of applying the dismountable resin to the propeller is performed (in the air) by the propeller manufacturer or the construction dock that manufactures the propeller 20. In step S <b> 11 of applying a dismountable resin to the propeller, the dismountable resin 30 is applied to the entire propeller 20 including the boss 21 and the plurality of blades 22.

  The decomposable resin 30 is a jelly-like resin that remains soft and sticky after curing. Therefore, the disassembleable resin 30 adheres to everything, but can be easily peeled off by applying force by hand and can be disassembled by hand. The dismantleable resin 30 exhibits a waterproof effect even in water. For example, a decomposable polyurethane resin “New Gela 4441J” commercially available from Sumitomo 3M Limited can be used as the decomposable resin 30.

  The dismountable resin 30 may be applied to the propeller 20 using a brush or a painting roller, or may be sprayed onto the propeller 20 using a painting air gun as described later.

  The step S12 of floating the hull in the water is executed after the step S11 of applying a dismantleable resin to the propeller. In step S12 in which the hull is floated on water, the hull 10 is floated on water. After that, outfitting is performed on the hull 10 floating on the water at the outfitting quay. During the outfitting period, the dismantleable resin 30 prevents marine organisms such as barnacles and mussels from adhering to the surface of the propeller 20.

  At the end of the outfitting period (before the trial run), step S13 for removing the dismantleable resin is executed. In step S13 for removing the dismantleable resin, the dismantable resin 30 is removed from the propeller 20. Specifically, the propeller 20 is rotated while the hull 10 is moored on the quay, and the dismantleable resin 30 is peeled off from the propeller 20 by the force of water flow. Here, when marine organisms are attached to the decomposable resin 30, the marine organisms are peeled off together with the decomposable resin 30.

  According to the present embodiment, it is possible to easily remove the disassembleable resin 30 from the propeller 20 by simply rotating the propeller 20. Note that the resin 30 that can be dismantled manually by the diver may be removed from the propeller 20. In this case, the work time for the diver to remove the dismantleable resin 30 is shorter than the work time for the diver to remove the sea life attached to the propeller as in the prior art.

  According to the marine organism adhesion preventing method for the marine propeller according to the present embodiment, the cost for cleaning the propeller can be reduced. Furthermore, since diver work is not necessary or the diver work time is short, there is no need to stop the seawater pump or stop equipment adjustment operation in the engine room for safety. The time required to stop the seawater pump or stop the equipment adjustment operation in the engine room is short, and the outfitting period can be shortened.

  The marine organism adhesion preventing method according to the present embodiment is a method of covering the propeller with a hard propeller cover made of plastic in order to prevent the adhesion of marine organisms by applying the dismantleable resin 30 to the propeller 20. In comparison, it is suitable for preventing marine organisms from adhering to the propellers of large ships.

(Second Embodiment)
The marine organism adhesion preventing method for the marine propeller according to the second embodiment of the present invention applies a dismantleable resin to the propeller, similarly to the marine organism adhesion preventing method for the marine propeller according to the first embodiment. Step S11, Step S12 for floating the hull in water, and Step S13 for removing the dismantleable resin are provided. However, in this embodiment, in step S11 in which the disposable resin is applied to the propeller, the disposable resin 30 is sprayed onto the propeller 20 using a coating air gun. According to this embodiment, the disposable resin 30 can be easily applied to the propeller 20.

  In addition, when the decomposable resin 30 is provided by mixing the A liquid and the B liquid, a coating air gun including a mixing nozzle that mixes and blows out the A liquid and the B liquid is used. By using a coating air gun equipped with a mixing nozzle, mixing of liquid A and liquid B and spraying of the dismantleable resin 30 onto the propeller 20 can be performed simultaneously. Therefore, step S11 for applying the dismantleable resin to the propeller can be efficiently performed.

(Third embodiment)
Referring to FIG. 3, the marine organism adhesion preventing method for a marine propeller according to the third embodiment of the present invention includes a step S <b> 21 for covering the propeller blade with a bag, and a dismantleable type in a portion not covered with the propeller bag. A step S22 for applying the resin, a step S23 for floating the hull in water, a step S24 for removing the bag, and a step S25 for removing the dismantleable resin are provided.

  FIG. 4 shows a marine organism adhesion prevention bag 40 used in the marine organism adhesion prevention method according to the present embodiment. The bag 40 is formed of a fine mesh such as that used for a plankton net. Here, since the size of larvae of barnacles and mussels is 200 μm or more, the size of the net (mesh) is preferably 200 μm or less.

  The bag 40 includes a front side net 41 and a back side net 42 disposed on the opposite side of the front side net 41. The front side net 41 and the back side net 42 are closed at the side edge 44 and the bottom edge 45 of the bag 40 to form the main body portion of the bag 40. The front side net 41 and the back side net 42 are not closed at the opening edge 43 of the bag 40. The opening edge 43 is disposed around the opening of the bag 40. A plurality of eyelets 47 are arranged along each of the opening edge 43 and the side edge 44. The eyelet 47 increases the strength of the bag 40. A rope band 46 is provided on each of the front side net 41 and the back side net 42. The rope band 46 includes two end portions 46 a coupled to the front side net 41 or the back side net 42, and an intermediate portion 46 b disposed between the two end portions 46 a and not coupled to the front side net 41 or the back side net 42.

  With reference to FIG. 5, step S21 which covers a propeller blade | wing with a bag, and step S22 which apply | coats a dismantleable type resin to the part which is not covered with the bag of a propeller are demonstrated. Step S21 for covering the propeller blade with the bag and step S22 for applying the dismantleable resin to the portion not covered with the propeller bag are performed (in the air) at the building dock.

  In step S21 of covering the propeller blades with the bags, the plurality of blades 22 of the propeller 20 are covered with the plurality of bags 40, respectively. More specifically, the bag 40 is covered with the blade 22, and the gap between the mouth (opening edge 43) of the bag 40 and the base portion of the blade 22 is closed with the waterproof tape 50. Here, if a rope (not shown) is attached to the rope band 46 and the bag 40 is covered with the blades 22 by operating the rope, the operation is easy. Further, when a string (not shown) is passed through a plurality of eyelets 44 arranged on the opening edge 43 and the opening of the bag 40 is squeezed with the string, the opening edge 43 is brought into close contact with the root portion of the blade 22. The work of closing the gap between the mouth (opening edge 43) and the base portion of the blade 22 with the waterproof tape 50 is facilitated.

  In step S22 of applying the dismantleable resin to the portion not covered with the propeller bag, the dismountable resin 30 is applied to the boss 21 as the portion not covered with the bag 40 of the propeller 20. Here, the dismantleable resin 30 may be applied to the propeller 20 using a brush or a painting roller, or may be sprayed to the propeller 20 using a painting air gun.

  The step S23 of floating the hull in the water is executed after the step S21 of covering the propeller blade with the bag and the step S22 of applying the dismantleable resin to the portion not covered with the bag of the propeller. In step S23 in which the hull is floated on water, the hull 10 is floated on water. After that, outfitting is performed on the hull 10 floating on the water at the outfitting quay. During the outfitting period, sea bags such as barnacles and mussels are prevented from adhering to the surface of the propeller 20 by the bag 40 and the dismantleable resin 30.

  Step S24 for removing the bag at the end of the outfitting period (before the trial run) and step S25 for removing the dismantleable resin are executed. In step S <b> 24 of removing the bag, the diver removes the bag 40 from the blade 22. In step S25 for removing the dismantleable resin, the dismantable resin 30 is removed from the boss 21. In step S25 for removing the dismantleable resin, the propeller 20 may be rotated while the hull 10 is moored on the outfitting quay, and the dismantleable resin 30 may be peeled off from the propeller 20 by the force of water flow, and the diver dismantles manually. The possible resin 30 may be removed from the propeller 20. The work time for the diver to remove the bag 40 or remove the dismantleable resin 30 is shorter than the work time for the diver to remove marine life attached to the propeller as in the prior art. Here, when marine life is attached to the bag 40, the marine life is removed together with the bag 40. If marine organisms are attached to the decomposable resin 30, the marine organisms are removed together with the decomposable resin 30.

  According to the marine organism adhesion preventing method for the marine propeller according to the present embodiment, the cost for cleaning the propeller can be reduced. Furthermore, since the diver's working time is short, the time required to stop the seawater pump or stop the equipment adjustment operation in the engine room for safety is short, and the outfitting period can be shortened. According to the present embodiment, the dismountable resin 30 only needs to be applied to the portion of the propeller 20 that is not covered with the bag 40, so the area for applying the dismountable resin 30 is reduced, and the working time is shortened. Furthermore, since the bag 40 is formed of a net, it is not necessary to remove air from the bag 40 in order not to generate buoyancy, and the working time is shortened.

  In the marine propeller prevention method according to the present embodiment, the propeller 20 is covered with a hard propeller cover such as plastic in order to prevent the marine organisms from adhering by covering the propeller 20 with the dismantleable resin 30 and the bag 40. Compared with the method, it is suitable for preventing marine organisms from adhering to the propeller of a large ship.

  In addition, in this embodiment, you may form the main-body part of the bag 40 with the sheet | seat which does not let seawater like a vinyl sheet.

DESCRIPTION OF SYMBOLS 10 ... Hull 15 ... Shaft 20 ... Propeller 21 ... Boss 22 ... Blade 30 ... Dismantleable resin 40 ... Sea life adhesion prevention bag 41 ... Front side net 42 ... Back side net 43 ... Opening edge 44 ... Side edge 45 ... Bottom edge 46 ... Rope band 46a ... End 46b ... Intermediate part 47 ... Eyelet 50 ... Waterproof tape

Claims (8)

Applying a dismantleable resin to the propeller;
Removing the releasable resin from the propeller. A method for preventing adhesion of marine organisms to a marine propeller. The step of removing the demountable resin comprises:
The method for preventing adhesion of marine organisms to a marine propeller according to claim 1, comprising a step of peeling the dismantleable resin from the propeller by rotating the propeller with the force of water flow. The method for preventing adhesion of marine organisms to a marine propeller according to claim 1 or 2, wherein in the step of applying the dismantleable resin, the dismantable resin is applied to the entire propeller. Covering the propeller blades with a bag;
Further removing the bag from the wing,
The method for preventing adhesion of marine organisms to a marine propeller according to claim 1 or 2, wherein in the step of applying the dismantleable resin, the dismantable resin is applied to a portion of the propeller that is not covered with the bag. The step of covering the wing with the bag comprises:
Covering the blade with the bag;
The method for preventing adhesion of marine organisms to a marine propeller according to claim 4, further comprising a step of closing a gap between the mouth of the bag and the blade with a waterproof tape. The step of applying the demountable resin comprises
The method for preventing adhesion of marine organisms to a marine propeller according to any one of claims 1 to 5, further comprising the step of spraying the dismantleable resin on the propeller using a coating air gun. The decomposable resin is provided by mixing A liquid and B liquid,
The said coating air gun is equipped with the mixing nozzle which mixes and blows out the said A liquid and the said B liquid, The marine organism adhesion prevention method of the ship propeller of Claim 6. The method for preventing adhesion of marine organisms to a marine propeller according to any one of claims 1 to 7, wherein the dismantleable resin is a jelly-like resin that remains soft and adhesive after curing.

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