Ship manhole check ring

Abstract

The utility model discloses a ship manhole check ring which comprises an installation seat assembly, a first protection pipe is fixedly arranged on the installation seat assembly, a second protection pipe is fixedly arranged at the top end of the first protection pipe, the installation seat assembly is installed on a manhole body, and the installation 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] This utility model relates to the field of manhole protection technology, and in particular to a ship manhole retaining ring. Background Technology

[0002] A ship is a general term for all kinds of vessels, a means of transportation capable of navigating or anchoring in waterways for transport or operations. Ship manholes are important safety devices on ships, primarily used to allow personnel to enter and exit cabins or equipment for inspection, maintenance, and other operations. They are circular openings on ship bulkheads or equipment, equipped with sealing covers and fastening devices, providing a safe passage for personnel. Their core function is to ensure the safety of the ship during navigation and the normal operation of equipment through a sealed structure. Manhole dimensions are usually described by length, width, and height, and must meet the requirements for personnel passage and tool operation space. Standard ship manholes typically have a diameter of 600 mm or more. Ship manholes are key components ensuring the safe operation of ships. A manhole cover refers to the collective term for a sealing cover plate and its fixing accessories installed on the manhole.

[0003] Ship decks and platforms have a large number of manholes. These manholes are open during the ship construction process. When the manhole structure is not covered, there is a risk of people falling in, especially the manholes located on the deck, which are the most dangerous. Furthermore, external water can easily enter the cabin through the manholes on the deck, damaging the equipment inside the cabin or causing flooding accidents. Utility Model Content

[0004] Technical problems to be solved:

[0005] To address the shortcomings of existing technologies, this utility model provides a ship manhole retaining ring that is directly installed on the existing manhole studs of the manhole body for protection. The shape of the folded tarpaulin is adaptively adjusted according to the distance between the adjusting base and the fixed base. The folded tarpaulin forms a water-blocking weir, preventing deck water from flowing into the cabin through the manhole body. Safety nets or tarpaulins can be hung on the top and sides 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.

[0006] Technical solution:

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A ship's manhole retaining ring includes a mounting base assembly. A first protective tube is fixedly mounted on the mounting base assembly, and a second protective tube is fixedly mounted on the top end of the first protective tube. The mounting base assembly is mounted on the manhole body. After the manhole retaining ring is installed, the first and second protective tubes together form a guardrail structure for safety protection. The mounting base assembly includes a fixed base and an adjustable base. A folded tarpaulin is provided between the fixed base and the adjustable base. A slot is provided on the fixed base. First connecting studs are fixedly mounted on both sides of the upper end face of the fixed base. Connecting lugs are welded and fixed on both sides of the adjustable base. A through hole is provided, and the first connecting stud of the fixed base passes through the through hole of the connecting lug. The fixed base and the adjusting base are fixedly connected by a locking nut. The height of the adjusting base relative to the fixed base is adjustable. The shape of the folded tarpaulin is adaptively adjusted according to the distance between the adjusting base and the fixed base. The folded tarpaulin forms a water-blocking weir to prevent deck water from flowing into the cabin through the manhole body. Multiple sets of first hooks are fixedly provided at the top of the second protective pipe, and multiple sets of second hooks are fixedly provided on the fixed base. Multiple sets of first hooks and multiple sets of second hooks form multiple hanging positions, which can hang safety nets or tarpaulins on the top and sides of the manhole retaining ring.

[0009] In one possible implementation, the manhole body includes a connecting surface, on which multiple sets of manhole studs are fixedly disposed. The multiple sets of manhole studs are evenly distributed at intervals along the circumferential direction of the connecting surface. When the manhole retaining ring is installed, the multiple sets of manhole studs on the manhole body form a connection position.

[0010] In one possible implementation, multiple sets of manhole studs of the manhole body pass through the slots of the fixing base, and the fixing base of the mounting base assembly is fixedly connected to the manhole body by fixing nuts. The corresponding number of fixing nuts are used to lock and fix the manhole body according to actual usage requirements.

[0011] In one possible implementation, the fixed base has a first fixing groove, the adjusting base has a second fixing groove, one end of the folded tarpaulin is fixedly connected to the first fixing groove, and the other end of the folded tarpaulin is fixedly connected to the second fixing groove. One end of the folded tarpaulin is fixed to the fixed base, and the other end of the folded tarpaulin is fixed to the adjusting base and moves synchronously with the adjusting base. When the distance between the fixed base and the adjusting base is small, the folded tarpaulin is folded between the fixed base and the adjusting base. When the distance between the fixed base and the adjusting base increases, the folded tarpaulin unfolds synchronously. The degree of unfolding of the folded tarpaulin is controlled by the distance between the fixed base and the adjusting base.

[0012] In one possible implementation, the first hook and the second hook are used to hang a safety net, which can be hung on the top and sides of the manhole retaining ring to provide further protection and prevent people or objects from falling.

[0013] In one possible implementation, the first hook and the second hook are used to hang a tarpaulin. By hanging the tarpaulin on the manhole retaining ring, rain is blocked and rainwater is prevented from entering the cabin through the manhole body. The tarpaulin structure provides safety protection for the cabin.

[0014] In one possible implementation, the first protective tube includes a first tube body and a second tube body. The second tube body is configured 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 extension length of the first tube body relative to the second tube body can be adjusted, thereby adjusting the total length of the first protective tube. By adjusting the total length of the first protective tube, the height of the manhole retaining ring can be adjusted.

[0015] In one possible implementation, the other end of the first tube is fixed to the adjustment base, and one end of the second tube is fixedly connected to the second protective tube. The first protective tube is provided in four sets, and the four sets of the first protective tube are evenly distributed along the circumference of the adjustment base. There is a space between two adjacent sets of the first protective tube, which can be used for personnel to enter and exit. At the same time, the four sets of the first protective tube can also provide protection to prevent personnel from accidentally stepping into the gap and falling.

[0016] In one possible implementation, a third hook is provided on the second tube body of the first protective tube. The third hook is used to fix the marking plate. The third hook includes a second connecting stud. A connecting seat is provided on the second tube body. The connecting seat of the second tube body and the second connecting stud of the third hook are threadedly connected. The third hook is threadedly connected to the second tube body. The third hook and the second tube body have a detachable connection structure.

[0017] In one possible implementation, the marking board includes a text area, and a reflective strip is provided around the text area. The reflective strip on the marking board significantly improves the visibility of the marking board at night or in low light conditions, thereby improving the visibility of the manhole body, reminding staff of the location of the manhole body, and improving safety.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This utility model is directly installed on the original manhole stud of the manhole body for protection. It provides effective protection without affecting the entry and exit of staff, avoiding accidents of falling from heights and improving safety.

[0020] The mounting bracket assembly of this utility model consists of a fixed base and an adjustable base. The height of the adjustable base relative to the fixed base is adjustable. The shape of the folded tarpaulin is adaptively adjusted according to the distance between the adjustable base and the fixed base. The folded tarpaulin forms a water-blocking weir. The height of the water-blocking weir is controlled by the distance between the adjustable base and the fixed base. The unfolded height of the folded tarpaulin can be adjusted according to actual usage needs to prevent deck water from flowing into the cabin through the manhole body. When the manhole body is not equipped with a manhole cover, the tarpaulin structure provides safety protection for the cabin.

[0021] The multiple sets of first hooks and multiple sets of second hooks of this utility model form multiple hanging positions, which can hang safety nets or tarpaulins on the top and sides of the manhole retaining ring. Safety nets and tarpaulins can be selectively set according to actual use needs. When hanging safety nets, they are used to prevent people or objects from falling. When hanging tarpaulins, they are used to block rain and prevent rainwater from entering the cabin through the manhole body. The tarpaulin structure provides safety protection for the cabin.

[0022] The first protective tube of this utility model consists of two parts: a first tube and a second tube. By adjusting the total length of the first protective tube, the height of the manhole retaining ring can be adjusted, which improves the flexibility of the manhole retaining ring during use. The reflective strips on the marking plate significantly improve the visibility of the marking plate at night or in low light conditions, thereby improving the visibility of the manhole body, reminding workers of the location of the manhole body, and improving safety. Attached Figure Description

[0023] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the manhole body of this utility model;

[0026] Figure 3 This is an installation diagram of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the first protective tube of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the fixed base of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the adjusting base of this utility model;

[0030] Figure 7 This is a schematic diagram of the mounting base assembly of this utility model;

[0031] Figure 8 This is a schematic diagram showing the connection between the third hook and the second tube body of this utility model;

[0032] Figure 9 This is a schematic diagram of the installation of the marking plate of this utility model;

[0033] Figure 10 This is a schematic diagram of the structure of the marking plate of this utility model.

[0034] In the diagram: 1. Mounting base 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 tarpaulin; 14. Locking nut; 111. Groove; 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. Text area; 82. Reflective strip. Detailed Implementation

[0035] This application provides a ship manhole retaining ring that is directly installed on the existing manhole studs of the manhole body for protection. The shape of the folded tarpaulin is adaptively adjusted according to the distance between the adjustable base and the fixed base. The folded tarpaulin forms a water-blocking weir to prevent deck water from flowing into the cabin through the manhole body. Safety nets or tarpaulins can be hung on the top and sides of the manhole retaining ring. The height of the manhole retaining ring is adjustable, which improves the flexibility during use and solves the technical problems mentioned in the background art.

[0036] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0037] Example 1:

[0038] Please see Figure 1-10This utility model provides a technical solution: a ship manhole retaining ring, including a mounting base assembly 1, a first protective tube 2 fixedly mounted on the mounting base assembly 1, a second protective tube 3 fixedly mounted on the top end of the first protective tube 2, the mounting base assembly 1 being mounted on the manhole body 4, the mounting base assembly 1 including a fixed base 11 and an adjusting base 12, a folded rain cloth 13 being provided between the fixed base 11 and the adjusting base 12, a slot 111 being provided on the fixed base 11, first connecting studs 112 being fixedly mounted on both sides of the upper end face of the fixed base 11, connecting lugs 121 being welded and fixed on both sides of the adjusting base 12, a through hole 122 being provided on the connecting lugs 121, the first connecting studs 112 of the fixed base 11 passing through the through hole 122 of the connecting lugs 121, the fixed base 11 and the adjusting base 12 being fixedly connected by a locking nut 14, a plurality of first hooks 5 being fixedly mounted on the top end of the second protective tube 3, and a plurality of second hooks 6 being fixedly mounted on the fixed base 11.

[0039] When the manhole cover is not installed on the manhole body 4, the manhole retaining ring provides protection without affecting the entry and exit of personnel, thus preventing accidents of falling from a height. When installing the manhole retaining ring, simply put the fixing base 11 of the mounting bracket 1 onto the original manhole stud 42 of the manhole body 4, and then tighten it with one or more sets of fixing nuts 9. The installation and removal of the manhole retaining ring is convenient. After the manhole retaining ring is installed, the first protective tube 2 and the second protective tube 3 together form a guardrail structure for safety protection.

[0040] Mounting base assembly 1 consists 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 fixed. The height of the adjusting base 12 relative to the fixed base 11 is adjustable. When adjusting the adjusting base 12, the locking nuts 14 on both sides are loosened. At this time, the adjusting base 12 can move axially along the axis of the first connecting stud 112 to adjust the distance between the adjusting base 12 and the fixed base 11. After the position of the adjusting base 12 is adjusted, the locking nuts 14 on both sides are tightened again to re-tighten it.

[0041] The shape of the folded tarpaulin 13 is adaptively adjusted according to the distance between the adjusting base 12 and the fixed base 11. The folded tarpaulin 13 forms a water-blocking weir. The height of the water-blocking weir is controlled by the distance between the adjusting base 12 and the fixed base 11. The unfolded height of the folded tarpaulin 13 can be adjusted according to actual usage needs to prevent deck water from flowing into the cabin through the manhole body 4. When the manhole body 4 is not equipped with a manhole cover, the tarpaulin structure provides safety protection for the cabin.

[0042] In some examples, the manhole body 4 includes a connecting surface 41, on which multiple sets of manhole studs 42 are fixedly provided. The multiple sets of manhole studs 42 are evenly distributed along the circumferential direction of the connecting surface 41. When the manhole retaining ring is installed, the original multiple sets of manhole studs 42 on the manhole body 4 form a connection position.

[0043] In some examples, multiple sets of manhole studs 42 of the manhole body 4 pass through the slots 111 of the fixing base 11, and the fixing base 11 of the mounting base assembly 1 is fixedly connected to the manhole body 4 by fixing nuts 9.

[0044] like Figure 3 As shown, when installing the manhole retaining ring, the fixing base 11 of the mounting base assembly 1 is placed directly on the connecting surface 41 of the manhole body 4. The original multiple sets of manhole studs 42 on the manhole body 4 pass through the slots 111 of the fixing base 11. The multiple sets of manhole studs 42 form multiple connection positions. According to the actual use requirements, the corresponding number of fixing nuts 9 are used to lock and fix the manhole retaining ring on the manhole body 4 for safety protection.

[0045] In some examples, the fixed base 11 has a first fixed groove 113, the adjusting base 12 has a second fixed groove 123, one end of the folded rain cloth 13 is fixedly connected to the first fixed groove 113, and the other end of the folded rain cloth 13 is fixedly connected to the second fixed groove 123.

[0046] When the distance between the fixed base 11 and the adjusting base 12 is small, the folding tarpaulin 13 is folded between the fixed base 11 and the adjusting base 12. One end of the folding tarpaulin 13 is fixed to the fixed base 11, and the other end of the folding tarpaulin 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 tarpaulin 13 unfolds synchronously. The degree of unfolding of the folding tarpaulin 13 is controlled by the distance between the fixed base 11 and the adjusting base 12. The distance between the fixed base 11 and the adjusting base 12 can be adjusted according to actual usage needs to adjust the degree of unfolding of the folding tarpaulin 13 and block water.

[0047] In some examples, the first hook 5 and the second hook 6 are used to hang safety nets. Multiple sets of first hooks 5 form multiple hanging positions, and multiple sets of second hooks 6 form multiple hanging positions, which can hang safety nets on the top and sides of the manhole retaining ring, and further protect people or objects from falling.

[0048] In some examples, the first hook 5 and the second hook 6 are used to hang tarpaulins. Tarpaulins can be hung on the top and sides of the manhole retaining ring to provide complete waterproofing. When the manhole body 4 is not equipped with a manhole cover and it is raining or snowing, rain can be blocked by hanging tarpaulins on the manhole retaining ring to prevent rainwater from entering the cabin through the manhole body 4. The tarpaulin structure provides safety protection for the cabin. Both the safety net and the tarpaulin can be selectively installed according to actual usage needs.

[0049] By adopting the above technical solution:

[0050] The mounting bracket assembly 1 consists of a fixed base 11 and an adjustable base 12. The height of the adjustable base 12 relative to the fixed base 11 is adjustable. The shape of the folded tarpaulin 13 is adaptively adjusted according to the distance between the adjustable base 12 and the fixed base 11. The folded tarpaulin 13 forms a water-blocking weir. The height of the water-blocking weir is controlled by the distance between the adjustable base 12 and the fixed base 11. The unfolded height of the folded tarpaulin 13 can be adjusted according to actual usage needs to prevent 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 tarpaulin structure provides safety protection for the cabin.

[0051] Multiple sets of first hooks 5 and multiple sets of second hooks 6 form multiple hanging positions, which can hang safety nets or tarpaulins on the top and sides of the manhole retaining ring. Safety nets and tarpaulins can be selectively set according to actual usage needs. When hanging safety nets, they are used to prevent people or objects from falling. When hanging tarpaulins, they are used to block rain and prevent rainwater from entering the cabin through the manhole body 4. The tarpaulin structure provides safety protection for the cabin.

[0052] Example 2:

[0053] Based on Example 1, this example 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 configured 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.

[0054] The first protective tube 2 consists of two parts: a first tube 21 and a second tube 22. The first tube 21 and the second tube 22 are slidably connected. When the tightening screw 23 is loosened, the extension length of the first tube 21 relative to the second tube 22 can be adjusted, thereby adjusting the total length of the first protective tube 2. By adjusting the total length of the first protective tube 2, the height of the manhole retaining ring can be adjusted. After adjustment, the tightening screw 23 is tightened to re-tighten, which improves the flexibility of the manhole retaining ring during use.

[0055] In some examples, the other end of the first tube 21 is fixed to the adjusting base 12, and one end of the second tube 22 is fixedly connected to the second protective tube 3. The first protective tube 2 is provided in four sets, and the four sets of first protective tube 2 are evenly distributed along the circumference of the adjusting base 12. The four sets of first protective tube 2 form a side protection mechanism. There is a space between two adjacent sets of first protective tube 2, which can be used for personnel to enter and exit. At the same time, the four sets of first protective tube 2 can also provide protection to prevent personnel from accidentally stepping into the gap and falling.

[0056] In some examples, a third hook 7 is provided on the second tube body 22 of the first protective tube 2. The third hook 7 is used to fix the marking plate 8. The third hook 7 includes a second connecting stud 71. A connecting seat 221 is provided on the second tube body 22. The connecting seat 221 of the second tube body 22 is threadedly connected to the second connecting stud 71 of the third hook 7. Figure 8 As shown, the third hook 7 is threadedly connected to the second tube 22, and the two are detachable.

[0057] In some examples, the marker plate 8 includes a text area 81, with a reflective strip 82 surrounding the text area 81.

[0058] like Figure 9 As shown, when installing the marking plate 8, the marking plate 8 can be directly snapped and fixed onto 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 at night or in low light conditions by reflecting light, thereby improving the visibility of the manhole retaining ring and thus improving the visibility of the manhole body 4, reminding the staff of the location of the manhole body 4 and improving safety.

[0059] By adopting the above technical solution:

[0060] The first protective tube 2 consists of two parts: the first tube 21 and the second tube 22. By adjusting the total length of the first protective tube 2, the height of the manhole retaining ring can be 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 at night or in low light conditions, thereby improving the visibility of the manhole body 4, reminding staff of the location of the manhole body 4, and improving safety.

[0061] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A ship manhole retaining ring comprising a mounting seat assembly (1), characterized in that: The mounting seat assembly (1) is fixedly provided with a first protective pipe (2), and the top end of the first protective pipe (2) is fixedly provided with a second protective pipe (3); the mounting seat assembly (1) is mounted on a manhole body (4); the mounting seat assembly (1) comprises a fixed base (11) and an adjusting base (12); a folding rain cloth (13) is arranged between the fixed base (11) and the adjusting base (12); a notch (111) is formed in the fixed base (11); first connecting studs (112) are fixedly arranged on the two sides of the upper end face of the fixed base (11); connecting lugs (121) are welded and fixed on the two sides of the adjusting base (12); through holes (122) are formed in the connecting lugs (121); the first connecting studs (112) of the fixed base (11) pass through the through holes (122) of the connecting lugs (121); the fixed base (11) and the adjusting base (12) are fixedly connected through a locking nut (14); the top end of the second protective pipe (3) is fixedly provided with a plurality of first hooks (5); and a plurality of second hooks (6) are fixedly arranged on the fixed base (11).

2. A manhole retaining ring for a marine vessel as claimed in claim 1, wherein: The manhole body (4) comprises a connecting face (41), and a plurality of manhole studs (42) are fixedly arranged on the connecting face (41) and uniformly distributed along the circumferential direction of the connecting face (41).

3. A manhole retaining ring for a marine vessel as claimed in claim 2, wherein: The plurality of manhole studs (42) of the manhole body (4) pass through the notch (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 through a fixing nut (9).

4. A manhole closure ring for a marine vessel as claimed in claim 1, wherein: A first fixing groove (113) is formed in the fixed base (11), a second fixing groove (123) is formed in the adjusting base (12), one end of the folding rain cloth (13) is fixedly connected to the first fixing groove (113), and the other end of the folding rain cloth (13) is fixedly connected to the second fixing groove (123).

5. A manhole closure ring for a marine vessel as claimed in claim 1, wherein: The first hooks (5) and the second hooks (6) are used for hanging a safety net.

6. A manhole closure ring for a marine vessel as claimed in claim 1, wherein: The first hooks (5) and the second hooks (6) are used for hanging a rain cloth.

7. A manhole closure ring for a marine vessel as claimed in claim 1, wherein: The first protective pipe (2) comprises a first pipe body (21) and a second pipe body (22), the second pipe body (22) is in a hollow structure, one end of the first pipe body (21) extends into the inside of the second pipe body (22) and is slidably connected with the second pipe body (22), and the first pipe body (21) and the second pipe body (22) are fixedly connected through a jacking screw (23).

8. A manhole closure ring for a marine vessel as claimed in claim 7, wherein: The other end of the first pipe body (21) is fixed on the adjusting base (12), one end of the second pipe body (22) is fixedly connected to the second protective pipe (3), and four groups of the first protective pipes (2) are uniformly distributed along the circumferential direction of the adjusting base (12).

9. A ship manhole closure ring according to claim 8, characterised in that: The second pipe body (22) of the first protective pipe (2) is provided with a third hook (7) for fixing a marker plate (8), the third hook (7) comprises a second connecting stud (71), the second pipe body (22) is provided with a connecting seat (221), and the connecting seat (221) of the second pipe body (22) is threadedly connected with the second connecting stud (71) of the third hook (7).

10. A ship manhole closure ring according to claim 9, characterised in that: The marker plate (8) comprises a character area (81), and the periphery of the character area (81) is provided with a reflective strip (82).

Images