A deck water hole device and protection method for protecting the coating operation of the outer plate area of ​​a ship

Abstract

The present invention discloses a deck water flow hole device for protecting the outer plate area of ​​a ship during painting operations. The device includes a connecting module and a supporting module, wherein the connecting module is installed in the supporting module; the connecting module includes a threaded water flow pipe and a rotating device; the supporting module includes an axial threaded sleeve, a water flow hole plug body and a lifting device, wherein the lifting device includes a lifting member and a lifting slide rod; the threaded water flow pipe is installed on the side of the water flow hole plug body, and both ends of the threaded water flow pipe extend out of the two end sides of the water flow hole plug body, and the rotating device is installed at one end of the threaded water flow pipe, and the rotating device is fixedly connected to one end of the threaded water flow pipe; the present invention also relates to a method for protecting the outer plate area of ​​a ship during painting operations. The present invention tightly connects the water flow hole plug body with the deck water flow hole to prevent the oily and dirty water on the deck from flowing out to pollute the outer plate of the hull and hinder the painting operations in the outer plate area of ​​the hull.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a deck water hole device and a protection method for protecting a coating operation of an outer plate area of ​​a ship. Background Art

[0002] During the shipbuilding stage, the ship's construction environment is complex and there are many cross-operations. Oily sewage will be generated on the deck surface. The oily sewage will be discharged from the straight bottom outer plate side along the hull steel plate surface through the water holes set on the deck surface. The discharged oily sewage will cause serious pollution and damage to the steel plate surface and coating for the outer plate area painting operation, whether it is grinding and rust removal of the hull outer plate or paint spraying.

[0003] At present, in the painting operation in the hull plate area, wooden plugs are driven into the deck water holes to prevent oily sewage from flowing out through the deck water holes to pollute and corrode the hull plate. After the painting operation in the hull plate area is completed, the wooden plugs are removed. The wooden plugs cannot be reused and are not easy to remove, which prolongs the painting cycle of the hull plate area. The painting operation in different areas of the hull plate area needs to repeatedly drive in and remove the wooden plugs, which has low work efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a deck water hole device and protection method for protecting the coating operation in the outer plate area of ​​a ship. The device and method of the present invention are tightly connected to the deck water hole through a water hole plug body to prevent the oily and dirty water on the deck from flowing out and contaminating the outer plate of the hull, thereby hindering the coating operation in the outer plate area of ​​the hull.

[0005] In order to achieve the above invention purpose, the technical solution provided by the present invention is as follows:

[0006] A deck water flow hole device for protecting the coating operation of the outer plate area of ​​a ship, the device comprises a connecting module and a supporting module, the connecting module is installed in the supporting module; the connecting module comprises a threaded water flow pipe and a rotating device; the supporting module comprises an axial threaded sleeve, a water flow hole plug body and a lifting device, the lifting device comprises a lifting piece and a lifting slide rod; the threaded water flow pipe is installed on the side of the water flow hole plug body, the two ends of the threaded water flow pipe extend out of the two end sides of the water flow hole plug body, and the rotating device is installed at one end of the threaded water flow pipe The rotating device is fixedly connected to one end of the threaded water pipe, a cavity is provided in the water hole plug body, the lifting device and the axial threaded sleeve are installed in the water hole plug body, the threaded water pipes on both sides of the cavity of the water hole plug body are installed with the axial threaded sleeve, the lifting piece is installed on the side of the cavity of the water hole plug body, the lifting piece and the axial threaded sleeve are connected through the lifting rod, the rotating device rotates to drive the threaded water pipe to rotate, so that the axial threaded sleeve on the threaded water pipe moves relative to each other.

[0007] The threaded water pipe is in the shape of a hollow cylinder as a whole, with threads at both ends of the threaded water pipe, and the threads at both ends of the threaded water pipe are reversely arranged; the aperture of the threaded water pipe is not greater than one third of the aperture of the side surface of the water hole plug body.

[0008] A rotating water valve is arranged at the top of one end of the threaded water pipe on which the rotating device is installed, and the rotating water valve is threadedly connected to one end of the threaded water pipe; a fixing nut is arranged at the other end of the threaded water pipe, and the specified nut is threadedly connected to the other end of the threaded water pipe.

[0009] The above-mentioned rotating device includes a rotating screen cap and a rotating handle. The rotating screen cap is cylindrical as a whole, and a bolt hole is opened on the side of the rotating screen cap. A spring sheet and a flat gasket are arranged at the bottom of the rotating screen cap; the rotating screen cap is threadedly connected to the threaded water pipe, and a top sealing plate is arranged between the rotating screen cap and the water hole plug body. The rotating screen cap is tightly connected to the side of the water hole plug body through the top sealing plate; the top sealing plate is fixedly connected to the side of the water hole plug body by bolts, and the rotating handle is a straight rod as a whole. A round hole is arranged at the end of the rotating handle away from the rotating screen cap, and the rotating handle is installed on the side of the rotating screen cap.

[0010] A bottom tight gasket is provided between the fixing nut and the side of the water hole plug body, the fixing nut and the side of the water hole plug body are tightly connected through the bottom tight gasket, and the bottom tight gasket and the side of the water hole plug body are fixedly connected through bolts.

[0011] The above-mentioned water hole plug body is in the shape of a hollow cylinder as a whole. The water hole plug body is made of nitrile rubber. The lifting piece is installed on the cavity side of the water hole plug body. The top of the lifting piece is arc-shaped. The shape of the arc-shaped top of the lifting piece is the same as the shape of the inner side of the water hole plug body. A plurality of lifting pieces are arranged on the cavity side of the water hole plug body, and the lifting pieces are evenly distributed on the cavity side of the water hole plug body; the bottom of each lifting piece is hingedly connected to the lifting slide rod, the bottom of the lifting piece is obliquely connected to the two lifting slide rods, and the lifting slide rod connected to the bottom of each lifting piece is respectively fixedly connected to the axial threaded sleeves at both ends of the threaded water pipe; the angle range between the lifting slide rod and the bottom of the lifting piece is 0°-45°; the diameter of the water hole plug body and the diameter of the water hole on the hull deck are not more than 10mm different.

[0012] The above-mentioned axial threaded sleeve is a hollow cylindrical shape, and a thread is arranged on the inner side of the axial threaded sleeve. The axial threaded sleeve is installed at both ends of the threaded water pipe inside the cavity of the water hole plug body; a plurality of slide rod seats are arranged on the side of the axial threaded sleeve, and the slide rod seats are fixedly connected to the lifting slide rod.

[0013] A method for protecting the coating operation of the outer plate area of ​​a ship, the method specifically comprising the following steps:

[0014] The first step is to prepare a deck water flow hole device for protecting the coating operation of the outer plate area of ​​the ship, which device includes a connecting module and a supporting module, and the connecting module is installed in the supporting module; the connecting module includes a threaded water flow pipe and a rotating device; the supporting module includes an axial threaded sleeve, a water flow hole plug body and a jacking device, and the jacking device includes a jacking piece and a jacking slide rod; the threaded water flow pipe is installed on the side of the water flow hole plug body, and the two ends of the threaded water flow pipe extend out of the two end sides of the water flow hole plug body, and the rotating device is installed at one end of the threaded water flow pipe The device is fixedly connected to one end of the threaded water pipe, a cavity is provided in the water hole plug body, the lifting device and the axial threaded sleeve are installed in the water hole plug body, the threaded water pipes on both sides of the cavity of the water hole plug body are installed with the axial threaded sleeve, the side of the cavity of the water hole plug body is installed with the lifting piece, the lifting piece and the axial threaded sleeve are connected through the lifting rod, the rotation of the rotating device drives the threaded water pipe to rotate, so that the axial threaded sleeve on the threaded water pipe moves relatively;

[0015] The second step is to install the deck water hole device for protecting the outer plate area of ​​the ship in the deck water hole of the hull during the hull outer plate coating operation; the end of the deck water hole device for protecting the outer plate area of ​​the ship with a rotary water valve is located outside the deck water hole, and the end of the deck water hole device with a fixing nut is located inside the deck water hole;

[0016] The third step is to install the water hole plug into the deck water hole, and then rotate the handle to drive the threaded water pipe to rotate clockwise, and at the same time, the axial threaded sleeves on both ends of the threaded water pipe move toward each other, and the axial threaded sleeve drives the lifting slide rod to lift, so that the lifting part moves to the outside of the water hole plug to increase the diameter of the water hole plug, so that the water hole plug is tightly connected to the deck water hole;

[0017] Step 4: When the water hole plug body is tightly connected to the deck water hole, the rotating screen cap is self-locked and fixed by the spring sheet and flat gasket set at the bottom of the rotating screen cap; at the same time, the rotating water valve is closed to seal the deck water hole; and then the hull outer plate is painted;

[0018] Step 5: When the coating work of the hull outer plate is completed, open the rotary water valve to connect the deck water hole with the outside, so that the oily sewage generated on the deck surface can be discharged from the hull outside through the deck water hole along the hull steel plate surface;

[0019] The sixth step is to remove the deck water hole device used for protecting the painting operation in the outer plate area of ​​the ship before the hull is undocking, and drive the threaded water pipe to rotate counterclockwise by rotating the handle. At the same time, the axial threaded sleeves on both ends of the threaded water pipe move away from each other, and the axial threaded sleeve drives the jacking slide rod to descend, so that the jacking part moves toward the inside of the water hole plug body to reduce the diameter of the water hole plug body, so that the water hole plug body is separated from the deck water hole, and the deck water hole device used for protecting the painting operation in the outer plate area of ​​the ship is removed.

[0020] When installing the deck water hole device used for coating operation protection of the ship outer plate area in the second step, the length of the threaded water pipe extending out of the deck water hole is 150mm-200mm.

[0021] Based on the above technical solution, the present invention patented a deck water hole device and protection method for protecting the coating operation of the outer plate area of ​​a ship, which has achieved the following technical advantages through practical application:

[0022] 1. The water hole plug body in the deck water hole device for protecting the outer plate area of ​​the ship during painting operation of the present invention is made of nitrile rubber, so that the water hole plug body has oil resistance, water resistance, air tightness and excellent resilience, improves the tightness of the connection between the water hole plug body and the deck water hole, and at the same time increases the service life of the water hole plug body and reduces the production cost.

[0023] 2. The present invention is a method for protecting the coating operation in the outer plate area of ​​a ship. When installing the deck water hole device for protecting the coating operation in the outer plate area of ​​the ship, the length of the threaded water pipe extending out of the deck water hole is 150mm-200mm, thereby avoiding the oily and dirty water on the deck from contaminating the outer plate of the hull when flowing out, thereby preventing the coating operation in the outer plate area of ​​the hull from being hindered, and improving the quality of the coating operation in the outer plate area of ​​the hull.

[0024] 3. The deck water hole device for protecting the coating operation of the outer plate area of ​​a ship of the present invention drives the threaded water pipe to rotate through a rotating device, so that the jacking part rises or falls to realize the connection and separation of the water hole plug body to the deck water hole. At the same time, the rotating screen cap has a self-locking function, which improves the stability of the connection between the water hole plug body and the water hole plug body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a front view of a deck water hole device used for protecting the outer plate area of ​​a ship during coating operation.

[0026] Figure 2 The present invention is a left view of a deck water hole device used for coating operation protection of a ship outer plate area.

[0027] Figure 3 The present invention is a right view of a deck water flow hole device used for coating operation protection of a ship outer plate area.

[0028] Figure 4 The present invention is a cross-sectional view of a deck water flow hole device used for coating operation protection of a ship outer plate area. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0030] like Figure 1-4The present invention discloses a deck water flow hole device for protecting the coating operation of the outer plate area of ​​a ship, which device comprises a connecting module and a supporting module, wherein the connecting module is installed in the supporting module; the connecting module comprises a threaded water flow pipe 12 and a rotating device; the supporting module comprises an axial threaded sleeve 5, a water flow hole plug body 6 and a lifting device, wherein the lifting device comprises a lifting member 7 and a lifting slide rod 8; the threaded water flow pipe 12 is installed on the side of the water flow hole plug body 6, and both ends of the threaded water flow pipe 12 extend out of the side of both ends of the water flow hole plug body 6, and the rotating device is installed at one end of the threaded water flow pipe 12. The rotating device is fixedly connected to one end of the threaded water pipe 12, a cavity is provided in the water hole plug body 6, the lifting device and the axial threaded sleeve 5 are installed in the water hole plug body 6, the threaded water pipes 12 on both sides of the cavity of the water hole plug body 6 are installed with the axial threaded sleeve 5, the side surface of the cavity of the water hole plug body 6 is installed with the lifting member 7, the lifting member 7 is connected to the axial threaded sleeve 5 through the lifting rod 8, the rotating device rotates to drive the threaded water pipe 12 to rotate, so that the axial threaded sleeve 5 on the threaded water pipe 12 moves relative to each other.

[0031] The threaded water pipe 12 is in the shape of a hollow cylinder as a whole, and is provided with threads at both ends of the threaded water pipe 12, and the threads at both ends of the threaded water pipe 12 are reversely arranged; the aperture of the threaded water pipe 12 is not greater than one third of the aperture of the side surface of the water hole plug body 6.

[0032] A rotary water valve 1 is provided at the top of one end of the threaded water pipe 12 on which the rotating device is installed, and the rotary water valve 1 is threadedly connected to one end of the threaded water pipe 12; a fixing nut 11 is provided at the other end of the threaded water pipe 12, and the specified nut is threadedly connected to the other end of the threaded water pipe 12.

[0033] The above-mentioned rotating device includes a rotating screen cap 2 and a rotating handle 3. The rotating screen cap 2 is cylindrical as a whole. A bolt hole is opened on the side of the rotating screen cap 2. A spring sheet and a flat gasket are arranged at the bottom of the rotating screen cap 2. The rotating screen cap 2 is threadedly connected with the threaded water pipe 12. A top sealing plate 4 is arranged between the rotating screen cap 2 and the water hole plug body 6. The rotating screen cap 2 is tightly connected to the side of the water hole plug body 6 through the top sealing plate 4. The top sealing plate 4 is fixedly connected to the side of the water hole plug body 6 by bolts. The rotating handle 3 is a straight rod as a whole. A circular hole is provided at one end of the rotating handle 3 away from the rotating screen cap 2, and the rotating handle 3 is installed on the side of the rotating screen cap 2; the threaded water pipe 12 is driven to rotate by the rotating device, so that the jacking member 7 rises or falls to realize the connection and separation of the water hole plug body 6 to the deck water hole, and at the same time, the rotating screen cap 2 has a self-locking function, which improves the stability of the connection between the water hole plug body 6 and the water hole plug body 6; the top sealing gasket 4 on the side of the rotating screen cap 2 and the water hole plug body 6 improves the sealing performance of the rotating screen cap 2 and the water hole plug body 6, thereby preventing the outflow of oily and dirty water on the deck.

[0034] A bottom tight gasket 10 is provided between the fixing nut 11 and the side of the water hole plug body 6, the fixing nut 11 is tightly connected to the side of the water hole plug body 6 through the bottom tight gasket 10, and the bottom tight gasket 10 is fixedly connected to the side of the water hole plug body 6 through bolts; the bottom tight gasket 10 improves the sealing performance between the fixing nut 11 and the side of the water hole plug body 6.

[0035] The above-mentioned water hole plug body 6 is in the shape of a hollow cylinder as a whole. The water hole plug body 6 is made of nitrile rubber. The jacking piece 7 is installed on the side of the cavity of the water hole plug body 6. The top of the jacking piece 7 is set in an arc shape. The shape of the arc setting of the top of the jacking piece 7 is the same as the shape of the inner side of the water hole plug body 6. A plurality of jacking pieces 7 are set on the side of the cavity of the water hole plug body 6. The jacking pieces 7 are evenly distributed on the side of the cavity of the water hole plug body 6; the bottom of each jacking piece 7 is connected to the jacking slide rod 8 by a hinge, and the bottom of the jacking piece 7 is inclined with the two jacking slide rods 8 Oblique connection, the lifting slide rod 8 connected to the bottom of each lifting member 7 is fixedly connected to the axial threaded sliding sleeve 5 at both ends of the threaded water pipe 12; the angle range between the lifting slide rod 8 and the bottom of the lifting member 7 is 0°-45°; the diameter of the water hole plug body 6 is not more than 10mm different from the diameter of the water hole on the hull deck; the water hole plug body 6 is made of nitrile rubber, so that the water hole plug body 6 has oil resistance, water resistance, air tightness and excellent resilience, which improves the tightness of the connection between the water hole plug body 6 and the deck water hole, while increasing the service life of the water hole plug body 6 and reducing the production cost.

[0036] The above-mentioned axial threaded sleeve 5 is a hollow cylindrical shape, and a thread is arranged on the inner side of the axial threaded sleeve 5. The axial threaded sleeve 5 is installed at both ends of the threaded water pipe 12 inside the cavity of the water hole plug body 6; a plurality of slide rod seats 9 are arranged on the side of the axial threaded sleeve 5, and the slide rod seats 9 are fixedly connected to the lifting slide rod 8.

[0037] A method for protecting the coating operation of the outer plate area of ​​a ship, the method specifically comprising the following steps:

[0038] The first step is to prepare a deck water flow hole device for protecting the coating operation of the outer plate area of ​​the ship, which includes a connecting module and a supporting module, and the connecting module is installed in the supporting module; the connecting module includes a threaded water flow pipe 12 and a rotating device; the supporting module includes an axial threaded sleeve 5, a water flow hole plug body 6 and a jacking device, and the jacking device includes a jacking piece 7 and a jacking slide rod 8; the threaded water flow pipe 12 is installed on the side of the water flow hole plug body 6, and the two ends of the threaded water flow pipe 12 extend out of the two end sides of the water flow hole plug body 6, and the rotating device is installed at one end of the threaded water flow pipe 12. The rotating device is fixedly connected to one end of the threaded water pipe 12, a cavity is provided in the water hole plug body 6, the lifting device and the axial threaded sleeve 5 are installed in the water hole plug body 6, the threaded water pipes 12 on both sides of the cavity of the water hole plug body 6 are installed with the axial threaded sleeve 5, the side of the cavity of the water hole plug body 6 is installed with the lifting member 7, the lifting member 7 is connected to the axial threaded sleeve 5 through the lifting slide rod 8, the rotating device rotates to drive the threaded water pipe 12 to rotate, so that the axial threaded sleeve 5 on the threaded water pipe 12 moves relatively;

[0039] The second step is to install the deck water hole device for protecting the outer plate area of ​​the ship in the deck water hole of the hull during the hull outer plate painting operation; the end of the deck water hole device for protecting the outer plate area of ​​the ship provided with the rotary water valve 1 is located outside the deck water hole, and the end provided with the fixing nut 11 is located inside the deck water hole;

[0040] The third step is to install the water hole plug body 6 into the deck water hole, and then rotate the handle 3 to drive the threaded water pipe 12 to rotate clockwise. At the same time, the axial threaded sleeves 5 on both ends of the threaded water pipe 12 move toward each other, and the axial threaded sleeves 5 drive the lifting slide rod 8 to lift, so that the lifting member 7 moves to the outside of the water hole plug body 6 to increase the diameter of the water hole plug body 6, so that the water hole plug body 6 is tightly connected to the deck water hole;

[0041] Step 4: When the water hole plug body 6 is tightly connected to the deck water hole, the rotating screen cap 2 is self-locked and fixed by the spring sheet and the flat gasket provided at the bottom of the rotating screen cap 2; at the same time, the rotating water valve 1 is closed to seal the deck water hole; and then the hull outer plate is painted;

[0042] Step 5: When the coating work of the hull outer plate is completed, the rotary water valve 1 is opened to connect the deck water hole with the outside, so that the oily sewage generated on the deck surface can be discharged out of the hull through the deck water hole along the hull steel plate surface;

[0043] The sixth step is to remove the deck water hole device used for protecting the coating operation in the outer plate area of ​​the ship before the hull is undocking, and drive the threaded water pipe 12 to rotate counterclockwise by rotating the handle 3. At the same time, the axial threaded sleeves 5 on both ends of the threaded water pipe 12 move in opposite directions, and the axial threaded sleeves 5 drive the lifting slide rod 8 to descend, so that the lifting part 7 moves toward the inside of the water hole plug body 6 to reduce the diameter of the water hole plug body 6, so that the water hole plug body 6 is separated from the deck water hole, and the deck water hole device used for protecting the coating operation in the outer plate area of ​​the ship is removed.

[0044] When the deck water hole device used for protecting the painting operation in the outer plate area of ​​the ship in the second step is installed, the length of the threaded water pipe 12 extending out of the deck water hole is 150mm-200mm; this avoids the oily sewage on the deck from contaminating the outer plate of the hull when it flows out, hindering the painting operation in the outer plate area of ​​the hull, and improving the quality of the painting operation in the outer plate area of ​​the hull.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for protecting the coating operation of the outer plate area of ​​a ship, characterized in that: The method specifically comprises the following steps: The first step is to prepare a deck water flow hole device for protecting the coating operation of the outer plate area of ​​a ship, the device comprising a connecting module and a supporting module, the connecting module being installed in the supporting module; the connecting module comprising a threaded water flow pipe (12) and a rotating device; the supporting module comprising an axial threaded sleeve (5), a water flow hole plug body (6) and a lifting device, the lifting device comprising a lifting piece (7) and a lifting slide rod (8); the threaded water flow pipe (12) is installed on the side of the water flow hole plug body (6), the two ends of the threaded water flow pipe (12) extend out of the two end sides of the water flow hole plug body (6), the rotating device is installed at one end of the threaded water flow pipe (12), and the rotating device is installed at one end of the threaded water flow pipe (12). The device is fixedly connected to one end of the threaded water pipe (12); a cavity is provided in the water hole plug body (6); the lifting device and the axial threaded sleeve (5) are installed in the water hole plug body (6); the threaded water pipes (12) on both sides of the cavity of the water hole plug body (6) are installed with the axial threaded sleeve (5); the lifting member (7) is installed on the side of the cavity of the water hole plug body (6); the lifting member (7) and the axial threaded sleeve (5) are connected via the lifting rod (8); the rotation of the rotating device drives the threaded water pipe (12) to rotate, so that the axial threaded sleeve (5) on the threaded water pipe (12) moves relatively; A rotary water valve (1) is provided at the top of one end of the threaded water pipe (12) on which the rotary device is installed, and the rotary water valve (1) is threadedly connected to one end of the threaded water pipe (12); a fixing nut (11) is provided at the other end of the threaded water pipe (12), and the fixing nut is threadedly connected to the other end of the threaded water pipe (12); The rotating device comprises a rotating screen cap (2) and a rotating handle (3); the rotating screen cap (2) is cylindrical in shape as a whole, a bolt hole is opened on the side of the rotating screen cap (2), and a spring sheet and a flat gasket are arranged at the bottom of the rotating screen cap (2); the rotating screen cap (2) is threadedly connected to the threaded water pipe (12), a top sealing plate (4) is arranged between the rotating screen cap (2) and the water hole plug body (6), and the rotating screen cap (2) and the side of the water hole plug body (6) are tightly connected through the top sealing plate (4); the top sealing plate (4) and the side of the water hole plug body (6) are fixedly connected through bolts, the rotating handle (3) is a straight rod as a whole, a round hole is arranged at one end of the rotating handle (3) away from the rotating screen cap (2), and the rotating handle (3) is installed on the side of the rotating screen cap (2); The second step is to install the deck water hole device for protecting the outer plate area of ​​the ship during the coating operation in the deck water hole of the ship when the outer plate of the ship is being coated; one end of the deck water hole device for protecting the outer plate area of ​​the ship provided with a rotary water valve (1) is located outside the deck water hole, and one end provided with a fixing nut (11) is located inside the deck water hole; The third step is to install the water hole plug body (6) into the deck water hole, and then drive the threaded water pipe (12) to rotate clockwise by rotating the handle (3). At the same time, the axial threaded sleeves (5) on both ends of the threaded water pipe (12) move towards each other, and the axial threaded sleeves (5) drive the lifting slide rod (8) to lift, so that the lifting member (7) moves toward the outside of the water hole plug body (6) to increase the diameter of the water hole plug body (6), so that the water hole plug body (6) is tightly connected to the deck water hole; In the fourth step, when the water hole plug body (6) is tightly connected to the deck water hole, the rotating screen cap (2) is self-locked and fixed by means of a spring sheet and a flat gasket provided at the bottom of the rotating screen cap (2); at the same time, the rotating water valve (1) is closed to seal the deck water hole; and then the hull outer plate is painted; Step 5: After the coating work of the hull outer plate is completed, the rotary water valve (1) is opened to connect the deck water hole with the outside, so that the oily sewage generated on the deck surface can be discharged out of the hull through the deck water hole along the hull steel plate surface; The sixth step is to remove the deck water hole device used for coating operation protection of the outer plate area of ​​the ship before the hull is undocking, and drive the threaded water pipe (12) to rotate counterclockwise by rotating the handle (3). At the same time, the axial threaded sleeves (5) on both ends of the threaded water pipe (12) move in opposite directions. The axial threaded sleeves (5) drive the lifting slide rod (8) to descend, so that the lifting member (7) moves inwardly of the water hole plug body (6) to reduce the diameter of the water hole plug body (6), so that the water hole plug body (6) is separated from the deck water hole, and the deck water hole device used for coating operation protection of the outer plate area of ​​the ship is removed.

2. A method for protecting the coating operation of the outer plate area of ​​a ship according to claim 1, characterized in that: When the deck water hole device used for coating operation protection of the outer plate area of ​​the ship in the second step is installed, the length of the threaded water pipe (12) extending outside the deck water hole is 150mm-200mm.

3. A method for protecting the coating operation of the outer plate area of ​​a ship according to claim 1, characterized in that: The threaded water flow pipe (12) is in the shape of a hollow cylinder as a whole. Threads are arranged at both ends of the threaded water flow pipe (12). The threads at both ends of the threaded water flow pipe (12) are arranged in reverse. The aperture of the threaded water flow pipe (12) is not greater than one third of the aperture of the side surface of the water flow hole plug body (6).

4. A method for protecting the coating operation of the outer plate area of ​​a ship according to claim 1, characterized in that: A bottom tight gasket (10) is provided between the fixing nut (11) and the side of the water hole plug body (6); the fixing nut (11) and the side of the water hole plug body (6) are tightly connected via the bottom tight gasket (10); and the bottom tight gasket (10) and the side of the water hole plug body (6) are fixedly connected via bolts.

5. A method for protecting the coating operation of the outer plate area of ​​a ship according to claim 1, characterized in that: The water flow hole plug body (6) is in the shape of a hollow cylinder as a whole. The water flow hole plug body (6) is made of nitrile rubber. The lifting member (7) is installed on the side of the cavity of the water flow hole plug body (6). The top of the lifting member (7) is arranged in an arc shape. The shape of the arc-shaped top of the lifting member (7) is the same as the shape of the inner side of the water flow hole plug body (6). A plurality of lifting members (7) are arranged on the side of the cavity of the water flow hole plug body (6). The lifting members (7) are evenly distributed on the side of the cavity of the water flow hole plug body (6). The bottom of each lifting member (7) is connected to the lifting slide rod (8) by a hinge, the bottom of the lifting member (7) is connected to the two lifting slide rods (8) at an angle, and the lifting slide rod (8) connected to the bottom of each lifting member (7) is respectively fixedly connected to the axial threaded sleeves (5) at both ends of the threaded water pipe (12); the angle between the lifting slide rod (8) and the bottom of the lifting member (7) is in the range of 0°-45°; the diameter of the water hole plug body (6) is not more than 10 mm different from the diameter of the water hole on the hull deck.

6. A method for protecting the coating operation of the outer plate area of ​​a ship according to claim 5, characterized in that: The axial threaded sleeve (5) is in the shape of a hollow cylinder, a thread is arranged on the inner side of the axial threaded sleeve (5), and the axial threaded sleeve (5) is installed at both ends of the threaded water pipe (12) inside the cavity of the water hole plug body (6); a plurality of slide rod seats (9) are arranged on the side of the axial threaded sleeve (5), and the slide rod seats (9) are fixedly connected to the lifting slide rod (8).

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