Ship manhole check ring

Abstract

The ship manhole check ring comprises a mounting seat assembly, a first protection pipe is fixedly arranged on the mounting seat assembly, a second protection pipe is fixedly arranged at the top end of the first protection pipe, the mounting seat assembly is mounted on a manhole body, and the mounting seat assembly comprises a fixed base and an adjusting base; folding waterproof cloth is arranged between the fixed base and the adjusting base, a plurality of sets of first hooks are fixedly arranged at the top end of the second protection pipe, and a plurality of sets of second hooks are fixedly arranged on the fixed base. According to the technical scheme, the folding waterproof cloth is directly installed on an original manhole stud of the manhole body for protection, the shape of the folding waterproof cloth is adjusted in a self-adaptive mode along with the distance between the adjusting base and the fixed base, the folding waterproof cloth forms a water retaining cofferdam, deck accumulated water is prevented from flowing into a cabin through the manhole body, and the service life of the folding waterproof cloth is prolonged. A safety net or waterproof cloth can be hung on the top and the side face of the manhole check ring, the height of the manhole check ring is adjustable, and the flexibility in the using process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of manhole protection, and particularly to a ship manhole retaining ring. Background Art

[0002] A ship is a general term for various vessels and is a means of transportation that can navigate or berth in water areas for transportation or operations. A ship manhole is an important safety device on a ship, mainly used for personnel to enter and exit the cabin or for equipment maintenance, repair, and other operations. It is a circular opening provided on the bulkhead or equipment of the ship, equipped with a sealing cover and fastening devices, serving as a passage for personnel to enter and exit safely. Its core function is to ensure the safety of the ship during navigation and the normal operation of equipment through a sealing structure. The size of the manhole is usually described by length, width, and height, and needs to meet the requirements of personnel passage and tool operation space. The diameter of a standard ship manhole is mostly above 600 millimeters. A ship manhole is a key component to ensure the safe operation of the ship. A manhole cover refers to the general term for a cover plate with sealing performance and its fixed attachments installed on the manhole.

[0003] There are a large number of manholes on the ship deck and platform. During the shipbuilding process, these manholes are in an open state. When the manhole structure does not have a manhole cover installed, there is a risk of personnel falling during passage. Especially the manholes on the deck are the most dangerous, and external water is likely to enter the cabin from the manholes on the deck, damaging the equipment in the cabin or causing water accumulation accidents. Summary of the Invention

[0004] Technical Problems to be Solved Aiming at the deficiencies of the prior art, the present invention provides a ship manhole retaining ring, which is directly installed on the original manhole studs of the manhole body for protection. The shape of the folded rain cloth is adaptively adjusted following the distance between the adjusting base and the fixed base. The folded rain cloth forms a water retaining cofferdam to prevent deck water from flowing into the cabin through the manhole body. A safety net or rain cloth can be hung on the top and side of the manhole retaining ring. The height of the manhole retaining ring is adjustable, improving the flexibility during use and solving the technical problems mentioned in the background art.

[0005] Technical Solutions To achieve the above object, the present invention is realized through the following technical solutions: A manhole retaining ring for a ship, comprising a mounting seat assembly, on which a first protective pipe is fixedly arranged, the top of the first protective pipe is fixedly provided with a second protective pipe, the mounting seat assembly is installed on the manhole main body, after the manhole retaining ring is installed, the first protective pipe and the second protective pipe together form a guardrail structure for safety protection, the mounting seat assembly includes a fixed base and an adjustable base, a folding rain cloth is arranged between the fixed base and the adjustable base, a notch is formed in the fixed base, both sides of the upper end surface of the fixed base are fixedly provided with first connecting studs, both sides of the adjustable base are fixedly welded with connecting lugs, through holes are formed in the connecting lugs, the first connecting studs of the fixed base pass through the through holes of the connecting lugs, and the fixed base and the adjustable base are fixedly connected by a locking nut, the height position of the adjustable base relative to the fixed base is adjustable, and the shape of the folding rain cloth is adaptively adjusted according to the distance between the adjustable base and the fixed base, the folding rain cloth forms a water retaining cofferdam to prevent deck water from flowing into the cabin through the manhole main body, the top of the second protective pipe is fixedly provided with a plurality of groups of first hooks, and the fixed base is fixedly provided with a plurality of groups of second hooks, the plurality of groups of first hooks and the plurality of groups of second hooks form a plurality of hanging positions, and a safety net or a rain cloth can be hung on the top and side of the manhole retaining ring.

[0006] In a possible implementation manner, the manhole main body includes a connecting surface, on which a plurality of groups of manhole studs are fixedly arranged, and the plurality of groups of manhole studs are evenly spaced along the circumferential direction of the connecting surface. When installing the manhole retaining ring, the original plurality of groups of manhole studs on the manhole main body form connection positions.

[0007] In a possible implementation manner, the plurality of groups of manhole studs of the manhole main body all pass through the notch of the fixed base, and the fixed base of the mounting seat assembly and the manhole main body are fixedly connected by fixing nuts, and the corresponding number of fixing nuts are used for locking and fixing according to actual use requirements.

[0008] In a possible implementation manner, a first fixing groove is formed in the fixed base, a second fixing groove is formed in the adjustable base, one end of the folding rain cloth is fixedly connected to the first fixing groove, and the other end of the folding rain cloth is fixedly connected to the second fixing groove. One end of the folding rain cloth is fixed on the fixed base, the other end of the folding rain cloth is fixed on the adjustable base and moves synchronously with the adjustable base. When the distance between the fixed base and the adjustable base is small, the folding rain cloth is folded between the fixed base and the adjustable base. When the distance between the fixed base and the adjustable base increases, the folding rain cloth is unfolded synchronously, and the unfolding degree of the folding rain cloth is controlled by the distance between the fixed base and the adjustable base.

[0009] In a possible implementation, the first hook and the second hook are used for hanging a safety net, and can hang the safety net on the top and side of the manhole retaining ring, and further protect through the safety net to prevent the fall of people or objects.

[0010] In a possible implementation, the first hook and the second hook are used for hanging a tarpaulin. By hanging the tarpaulin on the manhole retaining ring, rain can be blocked to prevent the falling rain from entering the cabin through the manhole body, and the cabin is safely protected through the tarpaulin structure.

[0011] In a possible implementation, the first protective tube includes a first tube body and a second tube body. The second tube body is arranged as a hollow structure. One end of the first tube body extends into the interior of the second tube body and is slidably connected to the second tube body. The first tube body and the second tube body are fixedly connected by a tightening screw. When the tightening screw is loosened, the extending length of the first tube body relative to the second tube body can be adjusted, and then the total length of the first protective tube can be adjusted. By adjusting the total length of the first protective tube, the height of the manhole retaining ring can be adjusted.

[0012] In a possible implementation, the other end of the first tube body is fixed on an adjustment base, and one end of the second tube body is fixedly connected to a second protective tube. There are four groups of the first protective tubes, and the four groups of the first protective tubes are evenly distributed at intervals along the circumferential direction of the adjustment base. There is a space between adjacent two groups of the first protective tubes, and this space can be used for the entry and exit of personnel. At the same time, the four groups of the first protective tubes can also provide protection to prevent personnel from accidentally stepping on the empty and falling.

[0013] In a possible implementation, a third hook is arranged on the second tube body of the first protective tube. The third hook is used for fixing a marking plate. The third hook includes a second connecting stud. A connecting seat is arranged on the second tube body, and the connecting seat of the second tube body and the second connecting stud of the third hook are threadedly connected. The third hook and the second tube body are threadedly connected, and the third hook and the second tube body are a detachable connection structure.

[0014] In a possible implementation, the marking plate includes a text area, and a reflective strip is arranged on the periphery of the text area. The reflective strip on the marking plate significantly improves the visibility of the marking plate at night or under low light conditions, and further improves the visibility of the manhole body, reminds the staff of the position of the manhole body, and improves safety.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The present invention is directly installed on the original manhole stud of the manhole body for protection, and effectively protects while not affecting the entry and exit of the staff, avoids the occurrence of accidents of stepping on the empty and falling, and improves safety.

[0016] The mounting seat assembly of the present invention is composed of a fixed base and an adjustable base. The height position of the adjustable base relative to the fixed base is adjustable. The shape of the folding raincloth is adaptively adjusted following the distance between the adjustable base and the fixed base. The folding raincloth forms a water retaining cofferdam, and the height of the water retaining cofferdam is controlled by the distance between the adjustable base and the fixed base. It can correspondingly adjust the unfolding height of the folding raincloth according to actual use requirements, avoiding deck water from flowing into the cabin through the manhole body. When no manhole cover is installed on the manhole body, the raincloth structure provides safety protection for the cabin.

[0017] Multiple groups of first hooks and multiple groups of second hooks in the present invention form multiple hanging positions, capable of hanging a safety net or a raincloth on the top and side of the manhole retaining ring. Both the safety net and the raincloth can be selectively set according to actual use requirements. When the safety net is hung, it is used to prevent the fall of people or objects. When the raincloth is hung, it is used to block rain and prevent the falling rain from entering the cabin through the manhole body, and the raincloth structure provides safety protection for the cabin.

[0018] The pipe body of the first protective pipe of the present invention consists of two parts, namely the first pipe body and the second pipe body. By adjusting the total length of the first protective pipe, the height of the manhole retaining ring is adjusted, improving the flexibility of the manhole retaining ring during use. The reflective strips on the marking plate significantly enhance the visibility of the marking plate at night or under low light conditions, thereby improving the visibility of the manhole body, reminding the staff of the position of the manhole body, and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it in accordance with the content of the specification, the following takes the preferred embodiments of the present invention and combines with the drawings to describe in detail as follows.

[0020] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a structural schematic diagram of the manhole body of the present invention; Figure 3 is an installation schematic diagram of the present invention; Figure 4 is a structural schematic diagram of the first protective pipe of the present invention; Figure 5 is a structural schematic diagram of the fixed base of the present invention; Figure 6 is a structural schematic diagram of the adjustable base of the present invention; Figure 7 is a structural schematic diagram of the mounting seat assembly of the present invention; Figure 8 is a connection schematic diagram of the third hook and the second pipe body of the present invention; Figure 9 is an installation schematic diagram of the marking plate of the present invention; Figure 10 This is a schematic structural diagram of the marking plate of the present invention.

[0021] In the figure: 1. Mounting seat assembly; 2. First protective tube; 3. Second protective tube; 4. Manhole body; 5. First hook; 6. Second hook; 7. Third hook; 8. Marking plate; 9. Fixing nut; 11. Fixing base; 12. Adjusting base; 13. Folding rain cloth; 14. Locking nut; 111. Notch; 112. First connecting stud; 113. First fixing groove; 121. Connecting lug; 122. Through hole; 123. Second fixing groove; 21. First tube body; 22. Second tube body; 221. Connecting seat; 23. Tightening screw; 41. Connecting surface; 42. Manhole stud; 71. Second connecting stud; 81. Character area; 82. Reflective strip. Specific embodiments

[0022] In an embodiment of the present application, by providing a ship manhole retaining ring, which is directly installed on the original manhole stud of the manhole body for protection, the shape of the folding rain cloth is adaptively adjusted following the distance between the adjusting base and the fixing base. The folding rain cloth forms a water retaining cofferdam to prevent deck water from flowing into the cabin through the manhole body. A safety net or rain cloth can be hung on the top and side of the manhole retaining ring, and the height of the manhole retaining ring is adjustable, improving the flexibility during use and solving the technical problems mentioned in the background art.

[0023] The technical solution in the embodiment of the present application is to solve the problems in the above background art, and the general idea is as follows: Embodiment 1: Please refer to Figures 1-10 , the present invention provides a technical solution: a ship manhole retaining ring, including a mounting seat assembly 1, a first protective tube 2 is fixedly arranged on the mounting seat assembly 1, a second protective tube 3 is fixedly arranged at the top of the first protective tube 2, the mounting seat assembly 1 is installed on the manhole body 4, the mounting seat assembly 1 includes a fixing base 11 and an adjusting base 12, a folding rain cloth 13 is arranged between the fixing base 11 and the adjusting base 12, a notch 111 is opened on the fixing base 11, first connecting studs 112 are fixedly arranged on both sides of the upper end surface of the fixing base 11, connecting lugs 121 are welded and fixed on both sides of the adjusting base 12, through holes 122 are opened on the connecting lugs 121, the first connecting studs 112 of the fixing base 11 pass through the through holes 122 of the connecting lugs 121, and the fixing base 11 and the adjusting base 12 are fixedly connected by a locking nut 14. Multiple groups of first hooks 5 are fixedly arranged at the top of the second protective tube 3, and multiple groups of second hooks 6 are fixedly arranged on the fixing base 11.

[0024] When the manhole cover is not installed on the manhole body 4, it is protected by the manhole retaining ring, which provides effective protection while not affecting the entry and exit of the staff, avoiding the accident of stepping into the void and falling. When installing the manhole retaining ring, directly sleeved the fixed base 11 of the mounting seat assembly 1 on the original manhole stud 42 of the manhole body 4, and then tighten it with one or more groups of fixing nuts 9. The installation and disassembly of the manhole retaining ring are convenient. After the manhole retaining ring is installed, the first protective pipe 2 and the second protective pipe 3 together form a guardrail structure for safety protection.

[0025] The mounting seat assembly 1 is composed of a fixed base 11 and an adjusting base 12. The fixed base 11 is fixedly installed on the connecting surface 41 of the manhole body 4. After installation, the fixed base 11 remains stationary. The height position of the adjusting base 12 is adjustable relative to the fixed base 11. When adjusting the adjusting base 12, loosen the locking nuts 14 on both sides. At this time, the adjusting base 12 can move axially along the axis direction of the first connecting stud 112 to adjust the distance between the adjusting base 12 and the fixed base 11. After the position adjustment of the adjusting base 12 is completed, then tighten the locking nuts 14 on both sides to re-fasten.

[0026] The form of the folding tarpaulin 13 adapts to the distance between the adjusting base 12 and the fixed base 11. The folding tarpaulin 13 forms a water retaining cofferdam, and the height of the water retaining cofferdam is controlled by the distance between the adjusting base 12 and the fixed base 11. It can adjust the unfolding height of the folding tarpaulin 13 according to the actual use requirements to avoid the deck water from flowing into the cabin through the manhole body 4. When the manhole cover is not installed on the manhole body 4, the cabin is protected by the tarpaulin structure.

[0027] In some examples, the manhole body 4 includes a connecting surface 41, and multiple groups of manhole studs 42 are fixedly arranged on the connecting surface 41. The multiple groups of manhole studs 42 are evenly spaced along the circumferential direction of the connecting surface 41. When installing the manhole retaining ring, the multiple groups of original manhole studs 42 on the manhole body 4 form connection positions.

[0028] In some examples, the multiple groups of manhole studs 42 of the manhole body 4 all pass through the notch 111 of the fixed base 11, and the fixed base 11 of the mounting seat assembly 1 is fixedly connected to the manhole body 4 through the fixing nut 9.

[0029] As Figure 3 shown, when installing the manhole retaining ring, directly seat the fixed base 11 of the mounting seat assembly 1 on the connecting surface 41 of the manhole body 4. The multiple groups of original manhole studs 42 on the manhole body 4 just pass through the notch 111 of the fixed base 11. The multiple groups of manhole studs 42 form multiple groups of connection positions, and lock and fix them with the corresponding number of fixing nuts 9 according to the actual use requirements, so as to install the manhole retaining ring on the manhole body 4 for safety protection.

[0030] In some examples, a first fixing groove 113 is formed on the fixed base 11, and a second fixing groove 123 is formed on the adjusting base 12. One end of the folding raincloth 13 is fixedly connected to the first fixing groove 113, and the other end of the folding raincloth 13 is fixedly connected to the second fixing groove 123.

[0031] When the distance between the fixed base 11 and the adjusting base 12 is small, the folding raincloth 13 is folded between the fixed base 11 and the adjusting base 12. One end of the folding raincloth 13 is fixed to the fixed base 11, and the other end of the folding raincloth 13 is fixed to the adjusting base 12 and moves synchronously with the adjusting base 12. When the distance between the fixed base 11 and the adjusting base 12 increases, the folding raincloth 13 unfolds synchronously. The unfolding degree of the folding raincloth 13 is controlled by the distance between the fixed base 11 and the adjusting base 12. It is possible to adjust the distance between the fixed base 11 and the adjusting base 12 according to actual use requirements, so as to adjust the unfolding degree of the folding raincloth 13 for water blocking.

[0032] In some examples, the first hook 5 and the second hook 6 are used for hanging a safety net. Multiple groups of the first hooks 5 form multiple hanging positions, and multiple groups of the second hooks 6 form multiple hanging positions. It is possible to hang a safety net on the top and side surfaces of the manhole retaining ring, and further protect through the safety net to prevent the fall of people or objects.

[0033] In some examples, the first hook 5 and the second hook 6 are used for hanging a raincloth. It is possible to hang a raincloth on the top and side surfaces of the manhole retaining ring, and perform comprehensive waterproofing through the raincloth. When the manhole cover is not installed on the manhole body 4 and it is in rainy or snowy weather, a raincloth is hung on the manhole retaining ring to block rain and prevent the falling rainwater from entering the cabin through the manhole body 4. The cabin is safely protected through the raincloth structure. Both the safety net and the raincloth can be selectively set according to actual use requirements.

[0034] By adopting the above technical solutions: The mounting seat assembly 1 is composed of a fixed base 11 and an adjusting base 12. The height position of the adjusting base 12 relative to the fixed base 11 is adjustable. The shape of the folding raincloth 13 is adaptively adjusted following the distance between the adjusting base 12 and the fixed base 11. The folding raincloth 13 forms a water-blocking cofferdam, and the height of the water-blocking cofferdam is controlled by the distance between the adjusting base 12 and the fixed base 11. It is possible to correspondingly adjust the unfolding height of the folding raincloth 13 according to actual use requirements to avoid the deck water from flowing into the cabin through the manhole body 4. When the manhole cover is not installed on the manhole body 4, the cabin is safely protected through the raincloth structure.

[0035] Multiple groups of first hooks 5 and multiple groups of second hooks 6 form multiple hanging positions, which can hang safety nets or tarpaulins on the top and side of the manhole retaining ring. Both the safety net and the tarpaulin can be selectively set according to actual usage requirements. When hanging a safety net, it is used to prevent the fall of people or objects. When hanging a tarpaulin, it is used to block rain and prevent the falling rainwater from entering the cabin through the manhole body 4, and the cabin is safely protected through the tarpaulin structure.

[0036] Embodiment 2: Based on Embodiment 1, this embodiment introduces a specific structure of the first protective tube 2 in a ship manhole retaining ring. The first protective tube 2 includes a first tube body 21 and a second tube body 22. The second tube body 22 is provided with a hollow structure. One end of the first tube body 21 extends into the interior of the second tube body 22 and is slidably connected to the second tube body 22. The first tube body 21 and the second tube body 22 are fixedly connected by a tightening screw 23.

[0037] The tube body of the first protective tube 2 consists of two parts, namely the first tube body 21 and the second tube body 22, and the first tube body 21 and the second tube body 22 are slidably connected. When the tightening screw 23 is loosened, the extending length of the first tube body 21 relative to the second tube body 22 can be adjusted, and then the total length of the first protective tube 2 can be adjusted. By adjusting the total length of the first protective tube 2, the height of the manhole retaining ring can be adjusted. After the adjustment is completed, the tightening screw 23 is tightened again to improve the flexibility during the use of the manhole retaining ring.

[0038] In some examples, the other end of the first tube body 21 is fixed on the adjustment base 12, one end of the second tube body 22 is fixedly connected to the second protective tube 3, there are four groups of the first protective tubes 2, and the four groups of the first protective tubes 2 are evenly spaced along the circumferential direction of the adjustment base 12. The four groups of the first protective tubes 2 form a side protection mechanism, and there is a space between adjacent two groups of the first protective tubes 2, which can be used for personnel to enter and exit. At the same time, the four groups of the first protective tubes 2 can also provide protection to prevent personnel from accidentally stepping on and falling.

[0039] In some examples, a third hook 7 is provided on the second tube body 22 of the first protective tube 2, and the third hook 7 is used to fix the marking plate 8. The third hook 7 includes a second connecting stud 71, and a connecting seat 221 is provided on the second tube body 22. The connecting seat 221 of the second tube body 22 and the second connecting stud 71 of the third hook 7 are threadedly connected. As Figure 8 shown, the third hook 7 and the second tube body 22 are threadedly connected, and the connection structure between the two is a detachable connection structure.

[0040] In some examples, the marking plate 8 includes a text area 81, and a reflective strip 82 is provided on the periphery of the text area 81.

[0041] As Figure 9As shown, when installing the marking plate 8, the marking plate 8 can be directly clamped and fixed on the third hook 7. The marking plate 8 is fixed by the third hook 7, and the manhole body 4 is marked by the marking plate 8. The reflective strip 82 on the marking plate 8 significantly improves the visibility of the marking plate 8 under night or low-light conditions through the principle of reflecting light, improves the visibility of the manhole retaining ring, and further improves the visibility of the manhole body 4, reminding the staff of the position of the manhole body 4 and improving safety.

[0042] By adopting the above technical solutions: The tube body of the first protective tube 2 is composed of two parts, namely the first tube body 21 and the second tube body 22. By adjusting the total length of the first protective tube 2, the height of the manhole retaining ring is adjusted, which improves the flexibility of the manhole retaining ring during use. The reflective strip 82 on the marking plate 8 significantly improves the visibility of the marking plate 8 under night or low-light conditions, and further improves the visibility of the manhole body 4, reminding the staff of the position of the manhole body 4 and improving safety.

[0043] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. The obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A ship manhole retaining ring, comprising a mounting seat assembly (1), characterized in that: A first protective tube (2) is fixedly arranged on the mounting seat assembly (1), a second protective tube (3) is fixedly arranged on the top of the first protective tube (2), the mounting seat assembly (1) is mounted on the manhole body (4), the mounting seat assembly (1) comprises a fixed base (11) and an adjustable base (12), a folding rain cloth (13) is arranged between the fixed base (11) and the adjustable base (12), a notch (111) is provided on the fixed base (11), and first connecting studs (13) are fixedly arranged on both sides of the upper end surface of the fixed base (11). 112), connecting lugs (121) are welded and fixed on both sides of the adjustment base (12), and a through hole (122) is opened on the connecting lug (121), and the first connecting stud (112) of the fixed base (11) passes through the through hole (122) of the connecting lug (121), and the fixed base (11) and the adjustment base (12) are fixedly connected by a locking nut (14), and a plurality of groups of first hooks (5) are fixedly provided on the top end of the second protective tube (3), and a plurality of groups of second hooks (6) are fixedly provided on the fixed base (11).

2. A ship manhole retaining ring according to claim 1, characterized in that: The manhole body (4) comprises a connection surface (41), on which a plurality of groups of manhole studs (42) are fixedly arranged, and the plurality of groups of manhole studs (42) are evenly spaced and distributed along the circumferential direction of the connection surface (41).

3. A ship manhole retaining ring according to claim 2, characterized in that: The multiple groups of manhole studs (42) of the manhole body (4) all pass through the notches (111) of the fixed base (11), and the fixed base (11) of the mounting seat assembly (1) and the manhole body (4) are fixedly connected via a fixing nut (9).

4. A ship manhole retaining ring according to claim 1, characterized in that: The fixed base (11) is provided with a first fixed groove (113), the adjustable base (12) is provided with a second fixed groove (123), one end of the folding awning (13) is fixedly connected to the first fixed groove (113), and the other end of the folding awning (13) is fixedly connected to the second fixed groove (123).

5. A ship manhole retaining ring according to claim 1, characterized in that: The first hook (5) and the second hook (6) are used for hanging a safety net.

6. A ship manhole retaining ring according to claim 1, characterized in that: The first hook (5) and the second hook (6) are used for hanging a tarp.

7. A ship manhole retaining ring according to claim 1, characterized in that: The first protective tube (2) comprises a first tube body (21) and a second tube body (22); the second tube body (22) is arranged as a hollow structure; one end of the first tube body (21) extends into the interior of the second tube body (22) and is slidably connected to the second tube body (22); the first tube body (21) and the second tube body (22) are fixedly connected by a tightening screw (23).

8. A ship manhole retaining ring according to claim 7, characterized in that: The other end of the first tube body (21) is fixed on the adjustment base (12), one end of the second tube body (22) is fixedly connected to the second protection tube (3), four groups of the first protection tubes (2) are provided, and the four groups of the first protection tubes (2) are evenly spaced along the circumferential direction of the adjustment base (12).

9. A ship manhole retaining ring according to claim 8, characterized in that: A third hook (7) is provided on the second tube body (22) of the first protective tube (2), the third hook (7) being used to fix the marking plate (8), the third hook (7) comprising a second connecting stud (71), a connecting seat (221) is provided on the second tube body (22), and the connecting seat (221) of the second tube body (22) is threadedly connected to the second connecting stud (71) of the third hook (7).

10. A ship manhole retaining ring according to claim 9, characterized in that: The marking plate (8) comprises a text area (81), and a reflective strip (82) is arranged around the periphery of the text area (81).

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