Safety type dual-fuel bulk cargo ship

Abstract

The invention provides a safety type dual-fuel bulk cargo ship, and relates to the technical field of bulk cargo ships, the safety type dual-fuel bulk cargo ship comprises a dual-fuel bulk cargo ship body, the upper end part of the dual-fuel bulk cargo ship body is provided with a dual-fuel placement area, and fuel tank mounting brackets are symmetrically arranged in the dual-fuel placement area; a liquefied natural gas fuel tank and a diesel fuel tank are arranged on the inner sides of the two fuel tank mounting supports correspondingly, protective structures are arranged on the outer sides of the two fuel tank mounting supports correspondingly, each protective structure comprises a mounting side support, a connecting rod is arranged at the upper end of each mounting side support, and a protective shed is fixedly mounted between the two connecting rods. A plurality of connecting rods are arranged on the mounting side support, and the protective shed is arranged above the liquefied natural gas fuel tank and the diesel fuel tank between the connecting rods, so that the liquefied natural gas fuel tank and the diesel fuel tank can be protected, and the liquefied natural gas fuel tank and the diesel fuel tank are prevented from being damaged due to impact of rainwater and hail; and the safety is insufficient.

Description

Technical Field

[0001] The present invention belongs to the technical field of bulk carriers, and more specifically, particularly relates to a safe dual-fuel bulk carrier. Background Art

[0002] A dual-fuel bulk carrier is a bulk carrier that can use both traditional fuel oil (such as heavy oil, diesel, etc.) and another alternative fuel (such as liquefied natural gas LNG, methanol, etc.) as a power source. The design purpose of this type of ship is to be able to flexibly choose fuel while meeting the bulk cargo transportation function, so as to reduce operating costs, reduce environmental impact and many other advantages. Dual-fuel bulk carriers can significantly reduce pollutant emissions when using clean fuels (such as LNG). Compared with traditional fuel oil, LNG combustion basically does not produce sulfur oxides, nitrogen oxide emissions can be reduced by about 80-90%, and carbon dioxide emissions can also be reduced, which will help the shipping industry cope with global climate change and meet increasingly stringent environmental regulations.

[0003] At present, the fuel tanks of existing dual-fuel bulk carriers are usually on the deck. Due to the uncertainty of sea conditions, they are often prone to hail, big waves and heavy rain. The decks of existing dual-fuel bulk carriers lack corresponding protection for the fuel tanks, which makes it easy for the ships to be damaged by the physical factors brought by hail, big waves and heavy rain when encountering severe weather, resulting in low safety. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a safe dual-fuel bulk carrier to solve the above problems.

[0005] A safe dual-fuel bulk carrier, comprising a dual-fuel bulk carrier body, wherein the upper end of the dual-fuel bulk carrier body is provided with a dual-fuel placement area, wherein fuel tank mounting brackets are symmetrically arranged inside the dual-fuel placement area, and a liquefied natural gas fuel tank and a diesel fuel tank are respectively arranged inside two of the fuel tank mounting brackets;

[0006] The outer sides of the two fuel tank mounting brackets are provided with protective structures;

[0007] The protective structure includes an installation side bracket, each of which is provided with a connecting rod on the upper end, and a protective shed is fixedly installed between two groups of the connecting rods, the protective shed is located above the liquefied natural gas fuel tank and the diesel fuel tank, a double Y-shaped connecting rod bracket is fixedly installed on the upper end of the protective shed, the double Y-shaped connecting rod bracket is located at the center of the protective shed, a rotating circular shaft is symmetrically installed on the inner side of the double Y-shaped connecting rod bracket, and polyvinyl chloride shock-absorbing sheds are fixedly installed on the circumferential surfaces of the two rotating circular shafts, the two polyvinyl chloride shock-absorbing sheds are located on both sides of the double Y-shaped connecting rod bracket, and a plurality of through grooves are opened inside the two polyvinyl chloride shock-absorbing sheds, each of the through grooves is arranged horizontally, and slide grooves are symmetrically arranged on the side walls of the dual-fuel bulk carrier body.

[0008] Preferably, each inner wall of the slide groove is symmetrically provided with limiting grooves, a sliding bar is slidably installed inside each slide groove, a limiting block is slidably installed inside each limiting groove, and each limiting block is located on both sides of the sliding bar.

[0009] Preferably, the double Y-shaped connecting rod bracket is vertically arranged on the protective baffle, each of the sliding bars is fixedly installed with the limit block, and each of the sliding bars is fixedly installed with a protective baffle between each other, and the two protective baffles are located on both sides of the dual-fuel bulk carrier body, and the two protective baffles are located on both sides of the dual-fuel installation area.

[0010] Preferably, storage grooves are symmetrically provided on the side walls of the dual-fuel bulk carrier body, and two of the storage grooves are located between the slide grooves. Rack sets are provided on the side walls of the two protective baffles. Reducer motors are embedded on the inner walls of the two storage grooves, and gears are fixedly installed on the output shafts of the two reducer motors, and the gears are located inside the storage grooves.

[0011] Preferably, the two rack sets are on the same side as the gear, the two rack sets are parallel to the gear, the two rack sets are meshed with the gear, the upper ends of the two protective baffles are symmetrically fixed with fixing plates, and a polypropylene connecting strip is fixedly installed between each fixing plate and the polyvinyl chloride shock-absorbing shed.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In the present invention, by turning on the reduction motor, the output shaft of the reduction motor rotates, driving the gear fixedly connected to the output shaft of the reduction motor to rotate inside the storage slot. At this time, the rotation of the gear will mesh with the rack group on the protective baffle, so that the gear generates an upward radial force on the rack group, thereby driving the protective baffle to move upward, so that the protective baffle drives the sliding bar to slide inside the sliding slot. At the same time, the movement of the sliding bar will drive the protective baffle as a whole to extend above the dual-fuel bulk carrier body, and be located on both sides of the liquefied natural gas fuel tank and the diesel fuel tank, thereby completing the protection of both sides of the liquefied natural gas fuel tank and the diesel fuel tank, which can reduce the problem of damage to the liquefied natural gas fuel tank and the diesel fuel tank caused by physical factors brought by the bad weather and affecting the safety of the dual-fuel bulk carrier body in rain, hail or big waves, thereby improving the overall reliability of the dual-fuel bulk carrier body;

[0014] In the present invention, when the gear generates an upward radial force on the rack group, driving the protective baffle to move upward, the protective baffle drives the sliding bar to slide inside the sliding groove. At the same time, the movement of the sliding bar will drive the limit block on the sliding bar to move synchronously inside the limit groove, thereby providing multiple limits for the movement of the protective baffle, thereby improving the stability of the protective baffle when moving and improving the reliability;

[0015] In the present invention, when the protective baffle is raised, the raising of the protective baffle will drive the fixing plate to rise together, so that the fixing plate pulls the polypropylene connecting strip to rise together, and then pulls the polyvinyl chloride shock-absorbing shed to expand to both sides. Therefore, when rain and hail fall on the polyvinyl chloride shock-absorbing shed, the rain and hail will generate a radial force on the polyvinyl chloride shock-absorbing shed. Since the polypropylene connecting strip has a certain elasticity, when the polyvinyl chloride shock-absorbing shed is hit by rain and hail, the polyvinyl chloride shock-absorbing shed will vibrate up and down, reducing the impact force of rain and hail falling on the protective baffle, and further improving the protective performance of the protective baffle.

[0016] In the present invention, a plurality of through grooves are arranged on the polyvinyl chloride shock-absorbing shed, so that when a larger object falls on the polyvinyl chloride shock-absorbing shed, the through grooves can disperse the impact force. At the moment when the object contacts the shock-absorbing shed, the force will be transmitted to the surrounding through the through grooves. This dispersion effect can reduce the damage to the polyvinyl chloride shock-absorbing shed caused by excessive local pressure. Since the material of the polyvinyl chloride shock-absorbing shed itself has a certain elasticity, but the ability to withstand concentrated impact of larger objects is limited, the presence of the through grooves can better utilize its elasticity, allowing the entire polyvinyl chloride shock-absorbing shed to share the impact force, avoiding the rupture of the polyvinyl chloride shock-absorbing shed due to excessive local force, and further improving reliability.

[0017] In the present invention, when the protective baffle is raised, the raising of the protective baffle will drive the fixed plate to rise together, so that the fixed plate pulls the polypropylene connecting strip to rise together, and then the polypropylene connecting strip generates an upward force to drive the polyvinyl chloride shock-absorbing shed to rotate with the rotating circular axis on the double Y-shaped connecting rod bracket as the center of the circle, and then pulls the polyvinyl chloride shock-absorbing shed to expand to both sides, so that the polyvinyl chloride shock-absorbing shed can perform shock-absorbing treatment on objects that fall on the polyvinyl chloride shock-absorbing shed in a most efficient shock-absorbing state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the three-dimensional connection explosion structure of the present invention;

[0020] Figure 3 is a cross-sectional view of a dual-fuel bulk carrier body of the present invention;

[0021] Figure 4 The present invention Figure 3 A magnified view of the structure at A;

[0022] Figure 5 It is a schematic diagram of the explosion structure of the dual-fuel bulk carrier body connection of the present invention;

[0023] Figure 6 It is a schematic diagram of the explosion structure of the protective baffle connection of the present invention;

[0024] Figure 7 It is a schematic diagram of the explosion structure of the polyvinyl chloride shock-absorbing shed connected to the present invention;

[0025] Figure 8 The present invention Figure 7 A magnified view of the structure at B;

[0026] Fig. 9 It is a schematic diagram of the explosion connection structure of the protection baffle of the present invention.

[0027] In the figure, the correspondence between the component names and the figure numbers is: 11. Dual-fuel bulk carrier body; 12. Dual-fuel placement area; 13. Fuel tank mounting bracket; 14. Liquefied natural gas fuel tank; 15. Diesel fuel tank; 16. Mounting side bracket; 17. Connecting rod; 18. Protective baffle; 19. Double Y-shaped connecting rod bracket; 21. Rotating circular shaft; 22. Polyvinyl chloride shock-absorbing shed; 23. Through groove; 24. Slide groove; 25. Limit groove; 26. Sliding bar; 27. Limit block; 28. Protective baffle; 29. ​​Storage slot; 31. Reducer motor; 32. Gear; 33. Rack set; 34. Fixed plate; 35. Polypropylene connecting strip. DETAILED DESCRIPTION

[0028] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] See also Figure 1 - Fig. 9 The present invention provides a safe dual-fuel bulk carrier, comprising a dual-fuel bulk carrier body 11, a dual-fuel placement area 12 is provided at the upper end of the dual-fuel bulk carrier body 11, fuel tank mounting brackets 13 are symmetrically arranged inside the dual-fuel placement area 12, and a liquefied natural gas fuel tank 14 and a diesel fuel tank 15 are respectively arranged inside the two fuel tank mounting brackets 13;

[0030] The outer sides of the two fuel tank mounting brackets 13 are provided with protective structures;

[0031] The protective structure includes an installation side bracket 16, each of which is provided with a connecting rod 17 at the upper end thereof, and a protective shed 18 is fixedly installed between two groups of connecting rods 17, and the protective shed 18 is located above the liquefied natural gas fuel tank 14 and the diesel fuel tank 15. By setting up the protective structure, a plurality of connecting rods 17 are arranged on the installation side bracket 16, and the protective shed 18 is arranged above the liquefied natural gas fuel tank 14 and the diesel fuel tank 15 between the connecting rods 17, thereby providing protection for the liquefied natural gas fuel tank 14 and the diesel fuel tank 15, reducing the problem of insufficient safety caused by damage to the liquefied natural gas fuel tank 14 and the diesel fuel tank 15 due to the impact of rain and hail.

[0032] A double Y-shaped connecting rod bracket 19 is fixedly installed on the upper end of the protective shielding shed 18, and the double Y-shaped connecting rod bracket 19 is located at the center of the protective shielding shed 18. A rotating circular shaft 21 is symmetrically rotatably installed on the inner side of the double Y-shaped connecting rod bracket 19. A polyvinyl chloride shock absorbing shed 22 is fixedly installed on the circumferential surface of the two rotating circular shafts 21. The two polyvinyl chloride shock absorbing sheds 22 are located on both sides of the double Y-shaped connecting rod bracket 19. A plurality of through grooves 23 are opened inside the two polyvinyl chloride shock absorbing sheds 22, and each through groove 23 is arranged horizontally. By arranging a plurality of through grooves 23 on the polyvinyl chloride shock absorbing shed 22, when a larger object falls on the polyvinyl chloride shock absorbing shed 22, the through grooves 23 can disperse the impact force, and the object can be At the moment of touching the shock-absorbing shed, the force will be transmitted to the surrounding through the through groove 23. This dispersion effect can reduce the damage to the polyvinyl chloride shock-absorbing shed 22 caused by excessive local pressure. Since the material of the polyvinyl chloride shock-absorbing shed 22 itself has a certain elasticity, but its ability to withstand concentrated impact of larger objects is limited, the existence of the through groove 23 can better utilize its elasticity, allowing the entire polyvinyl chloride shock-absorbing shed 22 to share the impact force, avoiding the rupture of the polyvinyl chloride shock-absorbing shed 22 (polyvinyl chloride and polypropylene are both thermoplastic resin materials with good stretchability and elasticity, and both have a certain tolerance to general acid, alkali and other chemical substances) due to excessive local force, thereby further improving reliability.

[0033] The side walls of the dual-fuel bulk carrier body 11 are symmetrically provided with slide grooves 24, and the inner wall of each slide groove 24 is symmetrically provided with a limiting groove 25, and a sliding bar 26 is slidably installed inside each slide groove 24, and a limiting block 27 is slidably installed inside each limiting groove 25, and each limiting block 27 is located on both sides of the sliding bar 26, and the double Y-shaped connecting rod bracket 19 is vertically arranged on the protective baffle 18, and each sliding bar 26 is fixedly installed with the limiting block 27, and each sliding bar 26 is fixedly installed with a protective baffle 28 between each two. The two protective baffles 28 are located on both sides of the dual-fuel bulk carrier body 11, and the two protective baffles 28 are located on both sides of the dual-fuel placement area 12. When the gear 32 generates an upward radial force on the rack group 33, driving the protective baffle 28 to move upward, the protective baffle 28 drives the sliding bar 26 to slide inside the slide groove 24, and at the same time, the movement of the sliding bar 26 will drive the sliding bar 2 The limit blocks 27 on 6 move synchronously inside the limit grooves 25, thereby providing multiple limits for the movement of the protective baffle 28, thereby improving the stability of the protective baffle 28 during movement, improving reliability, and when the protective baffle 28 is raised, the raising of the protective baffle 28 will drive the fixing plate 34 to rise together, so that the fixing plate 34 pulls the polypropylene connecting strip 35 to rise together, and then pulls the polyvinyl chloride shock-absorbing shed 22 to expand to both sides. Therefore, when rain and hail fall on the polyvinyl chloride shock-absorbing shed 22, the rain and hail will generate a radial force on the polyvinyl chloride shock-absorbing shed 22, and because the polypropylene connecting strip 35 has a certain elasticity, when the polyvinyl chloride shock-absorbing shed 22 is hit by rain and hail, the polyvinyl chloride shock-absorbing shed 22 will vibrate up and down, reducing the impact force of rain and hail falling on the protective baffle 18, and further improving the protective performance of the protective baffle 18.

[0034] The side walls of the dual-fuel bulk carrier body 11 are symmetrically provided with storage grooves 29, and the two storage grooves 29 are both located between the slide grooves 24. Rack groups 33 are provided on the side walls of the two protective baffles 28. Reducer motors 31 are embedded in the inner walls of the two storage grooves 29. Gears 32 are fixedly installed on the output shafts of the two reducer motors 31. The gears 32 are located inside the storage grooves 29. The two rack groups 33 are on the same side as the gears 32. The two rack groups 33 are parallel to the gears 32. The two rack groups 33 are meshed with the gears 32. The upper ends of the two protective baffles 28 are symmetrically fixed with fixed plates 34. By turning on the reducer motor 31, the output shaft of the reducer motor 31 rotates, driving the gear 32 fixedly connected to the output shaft of the reducer motor 31 to rotate inside the storage groove 29. At this time, the rotation of the gear 32 will It will mesh with the rack set 33 on the protective baffle 28, so that the gear 32 generates an upward radial force on the rack set 33, thereby driving the protective baffle 28 to move upward, so that the protective baffle 28 drives the sliding bar 26 to slide inside the slide groove 24. At the same time, the movement of the sliding bar 26 will drive the protective baffle 28 as a whole to extend above the dual-fuel bulk carrier body 11, and be located on both sides of the liquefied natural gas fuel tank 14 and the diesel fuel tank 15, thereby completing the protection of both sides of the liquefied natural gas fuel tank 14 and the diesel fuel tank 15, which can reduce the problem of damage to the liquefied natural gas fuel tank 14 and the diesel fuel tank 15 caused by physical factors in rain, hail or high waves, thereby affecting the safety of the dual-fuel bulk carrier body 11, thereby improving the overall reliability of the dual-fuel bulk carrier body 11.

[0035] A polypropylene connecting strip 35 is fixedly installed between each fixed plate 34 and the polyvinyl chloride shock-absorbing shed 22. When the protective baffle 28 is raised, the rising of the protective baffle 28 will drive the fixed plate 34 to rise together, so that the fixed plate 34 pulls the polypropylene connecting strip 35 to rise together, and then the polypropylene connecting strip 35 generates an upward force to drive the polyvinyl chloride shock-absorbing shed 22 to rotate with the rotating circular shaft 21 on the double Y-shaped connecting rod bracket 19 as the center of the circle, and then pulls the polyvinyl chloride shock-absorbing shed 22 to expand to both sides, so that the polyvinyl chloride shock-absorbing shed 22 can be used in a most efficient shock-absorbing state to shock-absorbing objects that fall on the polyvinyl chloride shock-absorbing shed 22.

[0036] Working principle:

[0037] The first step is that when encountering rain, hail or big waves, the staff can protect the liquefied natural gas fuel tank 14 and the diesel fuel tank 15 on the dual-fuel bulk carrier body 11. The staff can turn on the reduction motor 31 to rotate the output shaft of the reduction motor 31, driving the gear 32 fixedly connected to the output shaft of the reduction motor 31 to rotate inside the storage slot 29. At this time, the rotation of the gear 32 will mesh with the rack set 33 on the protective baffle 28, so that the gear 32 generates an upward radial force on the rack set 33, thereby driving the protective baffle 28 to move upward, so that the protective baffle 28 drives the sliding bar 26 to slide inside the sliding slot 24. At the same time, the movement of the sliding bar 26 will drive the limit block 27 on the sliding bar 26 to move synchronously inside the limit slot 25, thereby driving the two protective baffles 28 to extend as a whole above the dual-fuel bulk carrier body 11, and be located on both sides of the liquefied natural gas fuel tank 14 and the diesel fuel tank 15, thereby completing the protection of both sides of the liquefied natural gas fuel tank 14 and the diesel fuel tank 15;

[0038] In the second step, when the protective baffle 28 is raised, the rise of the protective baffle 28 will drive the fixed plate 34 to rise together, so that the fixed plate 34 pulls the polypropylene connecting strip 35 to rise together, and then the polypropylene connecting strip 35 generates an upward force to drive the polyvinyl chloride shock absorbing shed 22 to rotate with the rotating circular shaft 21 on the double Y-shaped connecting rod bracket 19 as the center of the circle, and then pulls the polyvinyl chloride shock absorbing shed 22 to expand to both sides, thereby indirectly providing protection for the protective baffle 18. When rain and hail fall on the polyvinyl chloride shock absorbing shed 22, Rain and hail will generate a radial force on the polyvinyl chloride shock absorbing shed 22, and because the polypropylene connecting strip 35 has a certain elasticity, when the polyvinyl chloride shock absorbing shed 22 is hit by rain and hail, the polyvinyl chloride shock absorbing shed 22 will vibrate up and down, and the rain and hail will eventually slide through the through groove 23 on the polyvinyl chloride shock absorbing shed 22 or the front and rear sides of the polyvinyl chloride shock absorbing shed 22. The rain and hail that slide through the through groove 23 will fall on the protective shed 18 and slide from both sides of the protective shed 18 to the deck of the dual-fuel bulk carrier body 11.

[0039] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A safe dual-fuel bulk carrier, comprising a dual-fuel bulk carrier body (11), wherein the upper end of the dual-fuel bulk carrier body (11) is provided with a dual-fuel placement area (12), wherein the dual-fuel placement area (12) is symmetrically provided with fuel tank mounting brackets (13), wherein the inner sides of two fuel tank mounting brackets (13) are respectively provided with a liquefied natural gas fuel tank (14) and a diesel fuel tank (15), wherein the dual-fuel placement area (12) is provided with a fuel tank mounting bracket (13), wherein the fuel tank mounting bracket (13) is provided with a fuel tank mounting bracket ... ； The outer sides of the two fuel tank mounting brackets (13) are both provided with protective structures; The protective structure comprises a mounting side bracket (16), each mounting side bracket (16) is provided with a connecting rod (17) at its upper end, a protective shed (18) is fixedly mounted between two groups of the connecting rods (17), the protective shed (18) is located above the liquefied natural gas fuel tank (14) and the diesel fuel tank (15), a double Y-shaped connecting rod bracket (19) is fixedly mounted on the upper end of the protective shed (18), the double Y-shaped connecting rod bracket (19) is located at the center of the protective shed (18), a rotating circular shaft (21) is symmetrically mounted on the inner side of the double Y-shaped connecting rod bracket (19), polyvinyl chloride shock absorbing sheds (22) are fixedly mounted on the circumferential surfaces of the two rotating circular shafts (21), and the two polyvinyl chloride shock absorbing sheds (22) are located on both sides of the double Y-shaped connecting rod bracket (19).

2. A safe dual-fuel bulk carrier as claimed in claim 1, characterized in that: A plurality of through grooves (23) are provided inside the two polyvinyl chloride shock-absorbing sheds (22), and each of the through grooves (23) is arranged transversely. Slide grooves (24) are symmetrically provided on the side walls of the dual-fuel bulk carrier body (11).

3. A safe dual-fuel bulk carrier as claimed in claim 2, characterized in that: The inner wall of each slide groove (24) is symmetrically provided with a limiting groove (25), and a sliding bar (26) is slidably installed inside each slide groove (24).

4. A safe dual-fuel bulk carrier as claimed in claim 3, characterized in that: A limiting block (27) is slidably installed inside each limiting groove (25), and each limiting block (27) is located on both sides of the sliding bar (26).

5. A safe dual-fuel bulk carrier as claimed in claim 4, characterized in that: The double Y-shaped connecting rod bracket (19) is vertically arranged on the protective shed (18), and each of the sliding bars (26) is fixedly mounted on the limit block (27).

6. A safe dual-fuel bulk carrier as claimed in claim 5, characterized in that: A protective baffle (28) is fixedly installed between each of the sliding bars (26), and the two protective baffles (28) are located on both sides of the dual-fuel bulk carrier body (11), and the two protective baffles (28) are located on both sides of the dual-fuel installation area (12).

7. A safe dual-fuel bulk carrier as claimed in claim 6, characterized in that: The side walls of the dual-fuel bulk carrier body (11) are symmetrically provided with storage grooves (29), the two storage grooves (29) are both located between the slide grooves (24), and the side walls of the two protective baffles (28) are both provided with rack groups (33).

8. A safe dual-fuel bulk carrier as claimed in claim 7, characterized in that: A reduction motor (31) is embedded in the inner wall of the two storage grooves (29), and a gear (32) is fixedly mounted on the output shaft of the two reduction motors (31), and the gear (32) is located inside the storage groove (29).

9. A safe dual-fuel bulk carrier as claimed in claim 8, characterized in that: The two rack sets (33) are both on the same side as the gear (32), the two rack sets (33) are both parallel to the gear (32), and the two rack sets (33) are both meshed and installed with the gear (32).

10. A safe dual-fuel bulk carrier as claimed in claim 9, characterized in that: A fixing plate (34) is symmetrically fixedly installed on the upper ends of the two protective baffles (28), and a polypropylene connecting strip (35) is fixedly installed between each fixing plate (34) and the polyvinyl chloride shock-absorbing shed (22).

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