LNG fuel cabin external inspection structure

Abstract

The utility model discloses an LNG fuel cabin external inspection structure, which comprises a turnover platform plate, a telescopic platform plate, a folding guardrail and a hydraulic cylinder base, two U-shaped bent plates are arranged on the left side and the right side of the turnover platform plate, the turnover platform plate is fixedly connected above the U-shaped bent plates, and the telescopic platform plate is fixedly connected above the turnover platform plate. A first protection plate and a second protection plate are fixedly connected to the upper portion and the lower portion of the interior of the U-shaped bent plate, the leftmost side of the U-shaped bent plate is fixedly connected with a lug plate, the lug plate is in bolted connection with a hydraulic cylinder, the hydraulic cylinder is in bolted connection with a hydraulic cylinder base, and the hydraulic cylinder base is in welded connection with the fuel cabin wall. The U-shaped bending plate is in bolted connection with the connecting toggle plate, the connecting toggle plate is in welded connection with the fuel cabin wall, the telescopic platform is in sliding connection with the overturning platform through a slide way, and the folding guardrail is in bolted connection with the upper portion of the telescopic platform. The device has the characteristics that the practicability is high, the standard requirements are met, and the contact collision between the position of the inspection platform on the channel and the tank body during hoisting is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent inspection passage components, and particularly relates to an external inspection structure for an LNG fuel tank. Background Technique

[0002] In today's world, with the development of science and technology and human civilization, people's demand for energy is increasing. As a special ship for transporting liquefied gas energy, the LNG ship can meet people's demand for energy with its huge transportation volume and low cost. The LNG fuel tank has a complex structure, including multiple parts such as a liquid tank, a liquid tank shell, a protective steel cover, a splash-proof screen wall with an insulating layer, and an insulating layer. These parts need to be regularly inspected and evaluated to ensure the safety and integrity of the hull. The external inspection structure can provide necessary convenience so that inspectors can repair, maintain, and service various parts of the ship wall. At present, the materials of the backing plates and elbows welded between the ordinary passage and the bulkhead cannot meet the special low-temperature requirements of the LNG fuel tank, and the fixed inspection platform will damage the surface insulation of the liquid tank during the hoisting of the liquid tank.

[0003] Therefore, it is necessary to design an external inspection structure for an LNG fuel tank that is highly practical, meets the specification requirements, and avoids the contact and collision between the inspection structure on the passage and the tank body during hoisting. Content of the Utility Model

[0004] The purpose of the utility model is to provide an external inspection structure for an LNG fuel tank to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the utility model provides the following technical solution: An external inspection structure for an LNG fuel tank, including a flipping platform plate, a telescopic platform plate, a folding guardrail, and a hydraulic cylinder base, characterized in that: U-shaped bending plates are fixed on both sides of the flipping platform plate, the U-shaped openings of the U-shaped bending plates are arranged opposite to each other, and a first protective plate and a second protective plate are fixed inside the opening direction of the U-shaped bending plates;

[0006] Left and right support crossbeams are arranged inside the opening directions of the left and right U-shaped bending plates, the left and right support crossbeams are in contact with the corresponding first protective plate and the second protective plate, and the left and right support crossbeams are slidably connected to the U-shaped bending plates; ear plates are fixed on the U-shaped bending plates, one end of the U-shaped bending plate is fixedly connected with a bolt one, the bolt one is connected to a connecting elbow plate by inserting, the ear plate is fixedly connected with a bolt two, the connecting elbow plate is fixedly connected to the LNG fuel tank bulkhead, the LNG fuel tank bulkhead is the outer wall of the fuel tank of the LNG transport ship, the bolt two is connected to a hydraulic cylinder by inserting, the other end of the hydraulic cylinder is fixedly connected with a bolt three, the bolt three is connected to the hydraulic cylinder base by inserting, and the hydraulic cylinder base is fixedly connected to the LNG fuel tank bulkhead;

[0007] On one side of the left and right support crossbeams, a roller fixing frame is fixedly connected. The roller fixing frame is provided with positioning holes. Inside the roller fixing frame, a backing plate is fixedly connected. The backing plate is provided with the same number of positioning holes as the roller fixing frame. The positioning holes of the backing plate and the roller fixing frame are coaxially matched. The positioning holes of the roller fixing and the backing plate are both bolted with rollers;

[0008] The cylindrical surface of the roller is in contact with the side end face of the second protective plate. Above the roller fixing frame, a telescopic platform plate is fixedly connected. Both ends of the telescopic platform plate are fixedly connected with front and rear support crossbeams. The front and rear support crossbeams are welded to the left and right support crossbeams;

[0009] The folding guardrail includes a guardrail base and a guardrail. The guardrail base is in clearance fit with the guardrail. The two guardrail bases are bolted to both sides of the front end in the extending direction of the telescopic platform plate. One side of the guardrail base is fixedly connected with a left side turning ear and a right side turning ear. A through hole is provided between the left side turning ear and the right side turning ear;

[0010] The guardrail is fixedly connected with a middle turning ear. A through hole is provided in the middle of the middle turning ear. The middle turning ear is connected with a fourth pin by a pin. The fourth pin is connected with the left side turning ear and the right side turning ear by a pin. The left side turning ear and the right side turning ear are rotatably connected with the middle turning ear coaxially. A limiting hole with an included angle of 45 degrees with the center line is provided between the middle turning ear and the connection of the guardrail base. A pin shaft is provided inside the limiting hole. The pin shaft is inserted into the limiting hole in the extended state of the folding guardrail, and the pin shaft is pulled out of the limiting hole during folding.

[0011] According to the above technical solution, the connecting elbow plate is directly welded to the fuel tank wall, and the material is DH36.

[0012] According to the above technical solution, when the length of the telescopic platform plate exceeds 2500 mm, the principle of adding supports in the middle needs to be followed. When the distance from the tank wall is not greater than 300 mm, the support is made of flat steel -60X10; when the distance from the tank wall is not greater than 500 mm, the support is made of angle steel L50X50X6; when the distance from the tank wall is greater than 500 mm, the support is made of L63X63X6.

[0013] According to the above technical solution, when the telescopic platform plate is retracted to the limit position, a limiting plate is provided at the U-shaped bending plate. When the sliding platform extends to the limit, fixing holes are provided at the corresponding positions of the U-shaped bending plate and the left and right support crossbeams.

[0014] Compared with the prior art, the beneficial effects achieved by the present utility model are: the present utility model,

[0015] (1) By setting a weight sensor, when the weight on the external inspection structure of the LNG fuel tank reaches a certain value, an alarm will be triggered to sound an alarm, preventing irreparable damage to the passageway.

[0016] (2) By setting a distance sensor, when an external object approaches the external inspection structure of the LNG fuel tank by a certain distance, the alarm will sound to prevent the external inspection structure of the LNG fuel tank from being impacted.

[0017] (3) By setting a limit hole and a pin shaft, the ear part of the guardrail is fixed in the open state, preventing the guardrail from automatically folding during the use of the passageway.

[0018] (4) By setting a hydraulic cylinder, the external inspection structure of the LNG fuel tank can be automatically flipped, saving time and effort. Description of the Drawings

[0019] The drawings are used to provide a further understanding of the present invention and form a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 is a structural schematic diagram of the sliding platform of the present invention;

[0022] Figure 3 is a structural schematic diagram of the slideway of the present invention;

[0023] Figure 4 is a structural schematic diagram of the flipping platform of the present invention;

[0024] Figure 5 is a sectional structural schematic diagram of the slideway and the sliding platform of the present invention;

[0025] Figure 6 is a side view of the guardrail base and the guardrail joint of the present invention;

[0026] Figure 7 is a side sectional view of the guardrail base and the guardrail joint of the present invention;

[0027] Figure 8 is a front view of the guardrail base and the guardrail joint of the present invention;

[0028] In the figure: 1. Hydraulic cylinder base; 2. Hydraulic cylinder; 3. Ear plate; 4. Connecting elbow plate; 5. U-shaped bending plate; 51. First protective plate; 52. Second protective plate; 6. Roller fixing frame; 61. Padding plate; 62. Left and right support cross beams; 63. Front and rear support cross beams; 7. Roller; 8. Flip platform plate; 9. Telescopic platform plate; 10. Folding guardrail; 11. Guardrail base; 12. Guardrail; 13. Left side turning ear; 14. Right side turning ear; 15. Middle turning ear; 16. Limit hole; 17. Pin shaft. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figure 1 and Figure 4 The technical solution provided by the present invention: An external inspection structure for an LNG fuel tank includes a flip platform plate 8, a telescopic platform plate 9, a folding guardrail 10 and a hydraulic cylinder base 1;

[0031] U-shaped bending plates 5 are fixed on both sides of the flip platform plate 8, the U-shaped openings of the U-shaped bending plates 5 are arranged opposite to each other, and a first protective plate 51 and a second protective plate 52 are fixedly connected inside the opening direction of the U-shaped bending plates 5;

[0032] Left and right support cross beams 62 are arranged inside the openings of the left and right U-shaped bending plates 5, the left and right support cross beams 62 are attached to the corresponding first protective plate 51 and second protective plate 52, and the left and right support cross beams 62 form a sliding connection with the U-shaped bending plates 5;

[0033] Ear plates 3 are fixed on the U-shaped bending plates 5, a first pin is fixedly connected to one end of the U-shaped bending plate 5, the first pin is pin-connected to a connecting elbow plate 4, a second pin is fixedly connected to the ear plate 3, the connecting elbow plate 4 is fixedly connected to the LNG fuel tank wall, the LNG fuel tank wall is the outer wall of the fuel tank of the LNG carrier, the second pin is pin-connected to a hydraulic cylinder 2, the other end of the hydraulic cylinder 2 is fixedly connected to a third pin, the third pin is pin-connected to a hydraulic cylinder base 1, and the hydraulic cylinder base 1 is fixedly connected to the LNG fuel tank wall.

[0034] As Figure 2 and Figure 5, on one side of the left and right support crossbeams 62, there is a roller fixing bracket 6 fixedly connected. The roller fixing bracket 6 is provided with positioning holes. Inside the roller fixing bracket 6, there is a backing plate 61 fixedly connected. The backing plate 61 is provided with the same number of positioning holes as the roller fixing bracket 6. The positioning holes of the backing plate 61 and the roller fixing bracket 6 are coaxially matched. Bolts are connected with rollers 7 below the positioning holes of the roller fixing bracket 6 and the backing plate 61;

[0035] The cylindrical surface of the roller 7 is in contact with the side end face of the second protective plate 52. Above the roller fixing bracket 6, there is a telescopic platform plate 9 fixedly connected. At both lower ends of the telescopic platform plate 9, there are front and rear support crossbeams 63 fixedly connected. The front and rear support crossbeams 63 are welded to the left and right support crossbeams 62 to jointly support the telescopic platform plate 9.

[0036] Such as Figure 2 and Figures 6 - 8 , the folding guardrail 10 includes a guardrail base 11 and a guardrail 12. The guardrail 12 is in clearance fit with the guardrail base 11. Two guardrail bases 11 are bolted to both sides of the front end in the extending direction of the telescopic platform plate 9. On one side of the guardrail base 11, there is a left side turning ear 13 and a right side turning ear 14 fixedly connected. A through hole is provided between the left side turning ear 13 and the right side turning ear 14;

[0037] The guardrail 12 is fixedly connected with a middle turning ear 15. A through hole is provided in the middle of the middle turning ear 15. A fourth pin is connected to the middle turning ear 15 by pin connection. The fourth pin is connected to the left side turning ear 13 and the right side turning ear 14 by pin connection. The left side turning ear 13 and the right side turning ear 14 are rotatably connected to the middle turning ear 15 coaxially. A limiting hole 16 with an included angle of 45 degrees with the center line is provided between the connection of the middle turning ear 15 and the guardrail base 11. A pin shaft 17 is provided inside the limiting hole 16. The pin shaft 17 is inserted into the limiting hole 16 in the extended state of the folding guardrail 10, and the pin shaft 17 is withdrawn from the limiting hole 16 during folding.

[0038] Such as Figure 3 , when the telescopic platform plate 9 retracts to coincide with the end face of the U-shaped bending plate 5, a limiting plate is provided at the U-shaped bending plate 5. When the sliding platform extends to a distance of 1000 mm from the other end face of the U-shaped bending plate 5, fixing holes are provided at the corresponding positions of the U-shaped bending plate 5 and the left and right support crossbeams 62.

[0039] Weight sensors are installed at the bottoms of the flipping platform plate 8 and the telescopic platform plate 9. When overweight occurs, the weight sensors give an alarm.

[0040] A distance sensor is installed inside the front and rear support crossbeams 63 at the front end in the extending direction of the telescopic platform plate 9. When an external object approaches a certain distance from the external inspection structure of the LNG fuel tank, the distance sensor gives an alarm.

[0041] It should be added that the welding material of the connecting gusset plate 4 and the fuel tank wall is DH36.

[0042] The roller fixing bracket 6 has a distance of 80 mm between the centers of two adjacent through holes inside, and the diameter of the through hole is 16 mm.

[0043] The length of the flipping platform plate 8 exceeds 2500 mm, and the principle of adding supports in the middle needs to be followed. When the distance from the bulkhead is not greater than 300 mm, the support is made of flat steel -60X10; when the distance from the bulkhead is not greater than 500 mm, the support is made of angle steel L50X50X6; when the distance from the bulkhead is greater than 500 mm, the support is made of L63X63X6.

[0044] The roller 7 is made of polyurethane material.

[0045] Working principle: When hoisting the liquid tank, pull the folding guardrail 10. The roller 7 fits against the end face of the second protection plate 52 and slides along the end face, driving the telescopic platform plate 9 to slide under the flipping platform plate 8. After being fixed by the telescopic platform plate 9, pull out the pin shaft 17 inside the limit hole 16, rotate the guardrail 12, and the rotational connection formed by the left rotating ear 13, the right rotating ear 14, and the middle rotating ear 15 rotates the upper circular section of the guardrail base 11 to separate from the lower circular section of the guardrail 12, causing the guardrail 12 to fold towards the flipping platform plate 8. When the rod of the guardrail 12 is parallel to the plane of the flipping platform plate 8, start the hydraulic cylinder 2. The piston rod of the hydraulic cylinder 2 extends and retracts into the cylinder barrel, and the U-shaped bending plate 5 rotates relative to the connecting elbow plate 4, and the entire inspection passage flips upwards until it is parallel to the fuel bulkhead, then close the hydraulic cylinder 2;

[0046] After the liquid tank hoisting is completed and when it is necessary to perform inspections on the external structure of the fuel tank, start the hydraulic cylinder 2. The free end extends from the cylinder barrel, and the U-shaped bending plate 5 rotates relative to the connecting elbow plate 4. The entire inspection passage flips downwards until it is horizontal, then close the hydraulic cylinder 2. The guardrail 12 is lifted upwards, and the guardrail 12 rotates relative to the guardrail base 11 with the pins inside the left rotating ear 13, the right rotating ear 14, and the middle rotating ear 15 as the centers until the lower circular section of the guardrail 12 coincides with the upper circular section of the guardrail base 11. Insert the pin shaft 17 into the limit hole 16 to relatively fix the guardrail 12 and the guardrail base 11. The telescopic platform plate 9 under the flipping platform plate 8 extends until it is fixed at the coincidence of the positioning holes on the U-shaped bending plate 5 and the left and right support crossbeams 62. Push the folding guardrail 10, and the telescopic platform plate 9 extends from under the flipping platform plate 8. When the fixing hole on the U-shaped bending plate 5 coincides with the positioning hole on the left and right support crossbeams 62, the telescopic platform plate 9 is fixed.

[0047] Through the above method, it is convenient for inspectors to perform repairs, maintenance, and upkeep on various parts of the ship's wall, and the inspection structure will not damage the surface insulation of the liquid tank during liquid tank hoisting.

[0048] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0049] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An external inspection structure for an LNG fuel tank, characterized in that: It comprises a flip platform plate (8), a telescopic platform plate (9), a folding guardrail (10) and a hydraulic cylinder base (1); U-shaped bending plates (5) are fixed on both sides of the flip platform plate (8), the U-shaped openings of the U-shaped bending plates (5) are arranged opposite to each other, and a first protective plate (51) and a second protective plate (52) are fixed inside the opening direction of the U-shaped bending plates (5); Left and right supporting beams (62) are arranged in the opening direction of the left and right U-shaped bending plates (5), and the left and right supporting beams (62) are fitted with the first protective plate (51) and the second protective plate (52) on the corresponding sides, and the left and right supporting beams (62) and the U-shaped bending plate (5) are slidably connected; an ear plate (3) is fixed on the U-shaped bending plate (5), one end of the U-shaped bending plate (5) is fixedly connected with a latch 1, and the latch 1 is latched with a connecting toggle plate (4), and the ear plate (3) is fixedly connected with a latch 2, and the connecting toggle plate (4) is fixedly connected to the LNG fuel tank wall, and the LNG fuel tank wall is the outer wall of the fuel tank of the LNG transport ship, and the latch 2 is latched with a hydraulic cylinder (2), and the other end of the hydraulic cylinder (2) is fixedly connected with a latch 3, and the latch 3 is latched with a hydraulic cylinder base (1), and the hydraulic cylinder base (1) is fixedly connected to the LNG fuel tank wall; A roller fixing frame (6) is fixedly connected to one side of the left and right supporting cross beams (62), the roller fixing frame (6) is provided with a positioning hole, a pad (61) is fixedly connected to the inner side of the roller fixing frame (6), the pad (61) is provided with the same number of positioning holes as the roller fixing frame (6), the pad (61) and the positioning holes of the roller fixing frame (6) are coaxially matched, and the positioning holes of the roller fixing frame (6) and the positioning holes of the pad (61) are both bolted to rollers (7); The cylindrical surface of the roller (7) is fitted with the side end surface of the second protective plate (52); a telescopic platform plate (9) is fixedly connected to the top of the roller fixing frame (6); front and rear supporting beams (63) are fixedly connected to both ends of the telescopic platform plate (9); and the front and rear supporting beams (63) are welded to the left and right supporting beams (62); The folding guardrail (10) comprises a guardrail base (11) and a guardrail (12); the guardrail base (11) is gap-fitted with the guardrail (12); the two guardrail bases (11) are bolted to the front ends of the telescopic platform plate (9) in the extension direction; a left-side rotating ear (13) and a right-side rotating ear (14) are fixedly connected to one side of the guardrail base (11); a through hole is provided in the middle of the left-side rotating ear (13) and the right-side rotating ear (14); The guardrail (12) is fixedly connected with a middle rotating ear (15), a through hole is provided in the middle of the middle rotating ear (15), the middle rotating ear (15) is connected with a four-pin plug, the four-pin plug is connected with the left rotating ear (13) and the right rotating ear (14), the left rotating ear (13) and the right rotating ear (14) are coaxially rotatably connected with the middle rotating ear (15), a limiting hole (16) is provided between the middle rotating ear (15) and the guardrail base (11), and a pin shaft (17) is provided inside the limiting hole (16), the pin shaft (17) is inserted into the limiting hole (16) when the folding guardrail (10) is in an extended state, and the pin shaft (17) is pulled out of the limiting hole (16) when folding.

2. The LNG fuel tank external inspection structure according to claim 1, characterized in that: The welding material of the connecting bracket (4) and the fuel tank wall is DH36.

3. The LNG fuel tank external inspection structure according to claim 1, characterized in that: The distance between the centers of two adjacent through holes inside the roller fixing frame (6) is 80 mm, and the diameter of the through holes is 16 mm.

4. The LNG fuel tank external inspection structure according to claim 1, characterized in that: When the length of the turnover platform plate (8) exceeds 2500mm, the principle of adding support in the middle must be followed. When the distance from the bulkhead is not more than 300mm, the support is made of flat steel -60X10; when the distance from the bulkhead is not more than 500mm, the support is made of angle steel L50X50X6; when the distance from the bulkhead is more than 500mm, the support is made of L63X63X6.

5. The LNG fuel tank external inspection structure according to claim 1, characterized in that: The material used for the roller (7) is polyurethane.

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