Cargo hold for cryogenic liquid filling ship

Abstract

The invention belongs to the technical field of cryogenic liquid transportation, and particularly relates to a cargo hold for a cryogenic liquid filling ship, the cargo hold comprises a hold body, a plurality of groups of baffles are fixedly mounted in the hold body, the plurality of groups of baffles are arranged in an equidistant array, and an oscillation stopping mechanism for stopping oscillation of liquid and an auxiliary oscillation stopping assembly are arranged in the hold body. According to the cargo hold for the cryogenic liquid filling ship, through the use of the oscillation stopping mechanism, when cryogenic liquid oscillates, the blocking piece is firstly extruded, and first blocking is carried out under the action of the first damper and the reset spring; meanwhile, the first hinge rod drives the L-shaped rod to rotate, the oscillation stopping plate moves in the liquid oscillation direction, secondary blocking is formed, multiple sets of oscillation stopping mechanisms are arranged, multiple times of oscillation stopping can be conducted on the cryogenic liquid in the oscillation impact process, the multi-stage oscillation stopping structure weakens the liquid oscillation energy layer by layer, and compared with a traditional oscillation stopping mode, the oscillation stopping effect is greatly improved. The large-amplitude liquid oscillation can be more effectively dealt with, and the impact force of the liquid on the bulkhead is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic liquid transportation, and particularly to a cryogenic liquid filling ship cargo hold. Background Technique

[0002] Cryogenic liquids are widely used in the fields of energy, industry, etc. Shipping is an important transportation method for them. Taking LNG as an example, the cargo holds of cryogenic liquids are mostly rectangular structures. Since the width of the cargo hold is much smaller than the length, the sloshing amplitude and impact force of cryogenic liquids in the length direction are significantly higher than those in the width direction. Therefore, baffles need to be added in the length direction of the cargo hold.

[0003] Currently, in the prior art, for example, a Chinese patent with the publication number CN110877663B discloses an LNG filling ship liquid cargo hold and its anti-slosh device. This device reduces the sloshing of cryogenic liquids in the cargo hold by setting baffles in the cargo hold and adding anti-slosh walls and diversion holes. However, such solutions have the following limitations: The traditional baffle is a fixed rigid structure. When the sloshing amplitude of cryogenic liquids is large (such as when the ship encounters strong storms or rapid acceleration / deceleration conditions), relying only on the action of the baffle, secondary reflection waves are easily formed after the liquid impacts the baffle, exacerbating the fluid disturbance in the hold. Although the diversion holes can relieve the local pressure, they cannot effectively dissipate the high-frequency sloshing energy, especially the suppression effect on long-period and large-amplitude sloshing is limited. In view of this, a cryogenic liquid filling ship cargo hold is proposed. Summary of the Invention

[0004] The main purpose of the present invention is to provide a cryogenic liquid filling ship cargo hold that can solve the problems raised in the above background technique.

[0005] To achieve the above object, the cryogenic liquid filling ship cargo hold proposed by the present invention includes a hold body. A baffle is fixedly installed inside the hold body, and multiple groups of baffles are provided. The multiple groups of baffles are arranged at equal intervals in an array. An anti-slosh mechanism and an auxiliary anti-slosh assembly for damping the liquid are arranged inside the hold body. The anti-slosh mechanism includes:

[0006] A guide rod, which is fixedly connected to the outer wall of the baffle, and a connecting frame is fixedly connected to the outer wall of the guide rod;

[0007] An L-shaped rod, which is hinged to the outer wall of the connecting frame. A slosh plate is fixedly connected to the bottom of the L-shaped rod, and a first articulated rod is hinged to the end of the L-shaped rod far from the connecting frame;

[0008] A blocking member is provided at one end of the first articulated rod away from the L-shaped rod. A first damper is connected between the blocking member and the connecting frame. During the oscillation of the cryogenic liquid, the cryogenic liquid squeezes the blocking member through the baffle. At this time, under the action of the first damper and the return spring, the oscillation of the cryogenic liquid is blocked for the first time. At the same time, during the movement of the blocking member squeezing the return spring, the first articulated rod drives the L-shaped rod to rotate, causing the anti-oscillation plate to move in the direction of the oscillation of the cryogenic liquid, further damping the cryogenic liquid.

[0009] Preferably, the blocking member is composed of a moving plate, an articulated plate and a second damper. The moving plate is fixed to the first damper. The moving plate is elastically connected to the connecting frame through a return spring. The moving plate is elastically connected to the articulated plate through an arc spring. Both ends of the second damper are fixedly connected to the moving plate and the articulated plate respectively. A chute opening is formed on the outer wall of the moving plate, and the chute opening matches the guide rod. When the cryogenic liquid oscillates and impacts the articulated plate, under the action of the arc spring and the second damper, the articulated plate and the moving plate can be protected.

[0010] Preferably, multiple sets of anti-oscillation mechanisms are provided, and each set of anti-oscillation mechanisms is arranged between two baffles. Each set of anti-oscillation mechanisms has two L-shaped rods, anti-oscillation plates, first articulated rods and blocking members, and they are symmetrically arranged with respect to the center line of the connecting frame. This setting enables the cryogenic liquid to be damped multiple times during the oscillation impact process.

[0011] Preferably, a first fixing block and a second fixing block are fixedly connected to the outer wall of the L-shaped rod, and a round rod is fixedly connected between the first fixing block and the second fixing block.

[0012] Preferably, a first through hole is formed on the outer wall of the anti-oscillation plate, and the bottom of the anti-oscillation plate bends toward the side away from the auxiliary anti-oscillation assembly. The design of the first through hole enables the cryogenic liquid to pass through the anti-oscillation plate, preventing the problem of damage to the anti-oscillation plate caused by excessive impact of the cryogenic liquid on the anti-oscillation plate. Moreover, the bent part of the anti-oscillation plate can slow down the flow rate of the cryogenic liquid and improve the anti-oscillation effect.

[0013] Preferably, the auxiliary anti-oscillation assembly includes an air chamber, the air chamber is fixedly connected to the top of the anti-oscillation plate, the air chamber is penetrated by a piston rod and is slidably connected to the piston rod, the air chamber is communicated with an air pipe, one end of the air pipe away from the air chamber is communicated with an airbag, the end of the piston rod away from the air chamber is fixedly connected with a sliding plate, one side of the sliding plate away from the piston rod is articulated with a second articulated rod, and the end of the second articulated rod away from the sliding plate is articulated to the lower side of the connecting frame. By the rotation of the L-shaped rod, the anti-oscillation plate is driven to rotate. Under the action of the second articulated rod, the sliding plate moves, driving the piston rod to move upward, squeezing the gas in the air chamber into the airbag, causing the airbag to expand, which is convenient for improving the anti-oscillation effect subsequently.

[0014] Preferably, a through opening is provided on the outer wall of the airbag, and the through opening matches the through hole, and the sliding plate is penetrated by a round rod and is slidably connected to the round rod. During the expansion of the airbag, the through opening will gradually become smaller, reducing the passage speed of the cryogenic liquid, causing the cryogenic liquid to move toward the direction of the anti-sway plate close to the inner wall of the cargo hold, further improving the anti-sway effect on the cryogenic liquid.

[0015] Preferably, a sealing ring is provided in the gas bin for enhancing the sealing performance of the piston rod when it slides, and a piston plate is slidably connected in the gas bin, and the piston plate is fixed to the piston rod.

[0016] Preferably, when the movable plate moves toward the direction approaching the connecting frame, the first hinge rod drives the L-shaped rod to rotate, and the second hinge rod pulls the sliding plate to slide upward.

[0017] Preferably, a second through hole is provided on the outer wall of the baffle, a notch is provided on the top of the baffle, a reinforcement is fixedly connected to the outer wall of the baffle, the reinforcement is fixedly installed in the cabin and is used through the second through hole to facilitate the passage of cryogenic liquid when it flows, thereby preventing the baffle from being damaged by excessive pressure. The use of the notch allows the violently oscillating cryogenic liquid to pass quickly, thereby further protecting the baffle.

[0018] The present invention provides a deep cold liquid filling ship cargo hold. It has the following beneficial effects:

[0019] (1) The cryogenic liquid filling ship cargo hold uses an anti-sway mechanism. When the cryogenic liquid oscillates, the blocking member is first squeezed, and the first blocking is performed under the action of the damper 1 and the return spring; at the same time, the hinged rod 1 drives the L-shaped rod to rotate, so that the anti-sway plate moves in the direction of liquid oscillation to form a secondary blocking. In addition, multiple groups of anti-sway mechanisms are arranged, so that the cryogenic liquid can be stopped for multiple times during the process of oscillation and impact. This multi-stage anti-sway structure weakens the sloshing energy of the liquid layer by layer. Compared with the traditional anti-sloshing method, it can more effectively cope with large-scale liquid oscillations and reduce the impact force of the liquid on the bulkhead.

[0020] (2) The cryogenic liquid is filled into the cargo hold of the ship through the anti-sway mechanism and the auxiliary anti-sway assembly. The L-shaped rod rotates to drive the piston rod to squeeze the gas in the air chamber into the air bag, causing it to expand. During the expansion of the air bag, the opening provided therein will gradually decrease, reducing the speed of the cryogenic liquid passing through, causing the cryogenic liquid to move toward the anti-sway plate close to the inner wall of the cargo hold, thereby further improving the anti-sway effect on the cryogenic liquid.

[0021] (3) By using the blocking member, when cryogenic liquid impacts the hinged plate, the arc-shaped spring and the damper II can buffer the impact, protecting the hinged plate and the moving plate. At the same time, it allows the blocking member to adaptively adjust its position and angle according to the liquid impact force. In addition, the bottom of the anti-sway plate is bent and provided with a through hole I, which can adapt to the liquid flow characteristics under different loading amounts and different sway intensities. Regardless of the amplitude of liquid oscillation, it can effectively play the anti-sway role and improve the anti-sway effect on cryogenic liquid.

[0022] (4) By opening a through hole II and a notch in the baffle of the cryogenic liquid filling ship's cargo hold, it is convenient for cryogenic liquid to pass through, avoiding damage to the baffle due to excessive pressure. The setting of the reinforcing member further enhances the strength of the baffle. The design of the through hole I in the anti-sway plate prevents the plate body from being damaged due to excessive liquid impact. The bending structure slows down the liquid flow rate while dispersing the impact force. The multiple protection designs reduce the damage risk of the key components of the cargo hold and extend the service life of the cabin body and the anti-sway mechanism. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall internal structure of the present invention Figure 1 ;

[0026] Figure 3 It is a schematic diagram of the overall internal structure of the present invention Figure 2 ;

[0027] Figure 4 It is a schematic diagram of the structure of the baffle, anti-sway mechanism and auxiliary anti-sway component of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the anti-sway mechanism and auxiliary anti-sway component of the present invention;

[0029] Figure 6 It is a schematic diagram of a partial structure of the anti-sway mechanism and auxiliary anti-sway component of the present invention;

[0030] Figure 7 It is a schematic diagram of a partial cross-sectional structure of the anti-sway mechanism and auxiliary anti-sway component of the present invention;

[0031] Figure 8 It is for the present invention Figure 7Schematic diagram of the structure of A;

[0032] Figure 9 It is a partial structural schematic diagram of the anti-swing mechanism of the present invention;

[0033] Figure 10 It is a schematic diagram of the baffle structure of the present invention.

[0034] Description of Figure Numbers:

[0035] 1. Cabin; 2. Baffle; 3. Anti-sway mechanism; 4. Auxiliary anti-sway assembly;

[0036] 21. through hole 2; 22. notch; 23. reinforcement member;

[0037] 31. guide rod; 32. connecting frame; 33. L-shaped rod; 34. anti-sway plate; 35. hinged rod 1; 36. blocking member; 37. damper 1; 331. fixed block 1; 332. fixed block 2; 333. round rod; 341. through hole 1; 361. moving plate; 362. hinged plate; 363. damper 2; 364. slide groove;

[0038] 41. Air chamber; 42. Piston rod; 43. Air pipe; 44. Air bag; 45. Through port; 46. Sliding plate; 47. Hinge rod 2; 411. Sealing ring; 412. Piston plate.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figures 1 - 10 The present invention proposes a cargo hold for a ship for filling cryogenic liquid, comprising a hull 1, a baffle 2 is fixedly installed inside the hull 1, and a plurality of baffles 2 are provided, and the plurality of baffles 2 are arranged in an equidistant array, a through hole 21 is provided on the outer wall of the baffle 2, a notch 22 is provided on the top of the baffle 2, a reinforcing member 23 is fixedly connected to the outer wall of the baffle 2, and the reinforcing member 23 is fixedly installed in the hull 1, and is used through the through hole 21 to facilitate the passage of cryogenic liquid during flow, thereby preventing the baffle 2 from being damaged by excessive pressure, and the use of the notch 22 allows the cryogenic liquid with violent oscillations to pass quickly, thereby further protecting the baffle 2, and an anti-sway mechanism 3 and an auxiliary anti-sway component 4 for stopping the swaying of the liquid are provided inside the hull 1.

[0042] In an embodiment of the present invention, in order to be able to damp the oscillation of cryogenic liquid during severe oscillation, specifically, the damping mechanism 3 includes a guide rod 31, an L-shaped rod 33 and a blocking member 36. The guide rod 31 is fixedly connected to the outer wall of the baffle 2. A connecting frame 32 is fixedly connected to the outer wall of the guide rod 31. The L-shaped rod 33 is hinged to the outer wall of the connecting frame 32. A damping plate 34 is fixedly connected to the bottom of the L-shaped rod 33. One end of the L-shaped rod 33 away from the connecting frame 32 is hinged with a first articulated rod 35. The blocking member 36 is arranged at one end of the first articulated rod 35 away from the L-shaped rod 33. A first damper 37 is connected between the blocking member 36 and the connecting frame 32. When the cryogenic liquid oscillates severely and passes through the notch 22 of the baffle 2, the cryogenic liquid impacts the blocking member 36 to move. Under the action of the first damper 37 and the return spring, the oscillation of the cryogenic liquid is blocked for the first time. At the same time, during the process of the blocking member 36 squeezing the return spring to move, the first articulated rod 35 drives the L-shaped rod 33 to rotate, so that the damping plate 34 moves in the direction of the oscillation of the cryogenic liquid, further damping the cryogenic liquid and improving the damping effect on the cryogenic liquid.

[0043] Furthermore, a first through hole 341 is formed in the outer wall of the damping plate 34. The bottom of the damping plate 34 bends towards the side away from the auxiliary damping assembly 4. The design of the first through hole 341 enables the cryogenic liquid to pass through the damping plate 34, preventing the problem that the damping plate 34 is damaged due to excessive impact of the cryogenic liquid on the damping plate 34. Moreover, the bent part of the damping plate 34 can slow down the flow rate of the cryogenic liquid and improve the damping effect.

[0044] Furthermore, the blocking member 36 is composed of a moving plate 361, an articulated plate 362 and a second damper 363. The moving plate 361 is fixed to the first damper 37. The moving plate 361 is elastically connected to the connecting frame 32 through a return spring. The moving plate 361 and the articulated plate 362 are elastically connected through an arc spring. The two ends of the second damper 363 are respectively fixed to the moving plate 361 and the articulated plate 362. A chute opening 364 is formed in the outer wall of the moving plate 361. The chute opening 364 matches the guide rod 31. By using the chute opening 364 and the guide rod 31, the moving plate 361 can be kept stable during movement. When the cryogenic liquid oscillates and impacts the articulated plate 362, under the action of the arc spring and the second damper 363, the impact of the cryogenic liquid can be buffered, thereby realizing the protection of the articulated plate 362 and the moving plate 361.

[0045] Furthermore, multiple anti-sway mechanisms 3 are provided, and each group of anti-sway mechanisms 3 is arranged between two groups of baffles 2. The L-shaped rods 33, anti-sway plates 34, first articulated rods 35, and blocking members 36 of each group of anti-sway mechanisms 3 are all provided in two groups and are symmetrically arranged with respect to the center line of the connecting frame 32. The multiple anti-sway mechanisms 3 provided enable the cryogenic liquid to be anti-swayed multiple times during the impact of oscillation. This multi-stage anti-sway structure weakens the liquid sloshing energy layer by layer. Compared with the traditional anti-sway method, it can more effectively cope with large-amplitude liquid oscillation and reduce the impact force of the liquid on the cabin wall.

[0046] In the embodiment of the present invention, in order to further improve the anti-sway effect on the oscillation of cryogenic liquid, specifically, a first fixing block 331 and a second fixing block 332 are fixedly connected to the outer wall of the L-shaped rod 33. A round rod 333 is fixedly connected between the first fixing block 331 and the second fixing block 332. The auxiliary anti-sway assembly 4 includes an air chamber 41. The air chamber 41 is fixedly connected to the top of the anti-sway plate 34. The air chamber 41 is penetrated by a piston rod 42 and is slidably connected to the piston rod 42. A sealing ring 411 is provided in the air chamber 41 to enhance the sealing performance when the piston rod 42 slides. A piston plate 412 is slidably connected in the air chamber 41. The piston plate 412 is fixed to the piston rod 42. The air chamber 41 is communicated with an air pipe 43. One end of the air pipe 43 away from the air chamber 41 is communicated with an air bag 44. One end of the piston rod 42 away from the air chamber 41 is fixedly connected to a sliding plate 46. One side of the sliding plate 46 away from the piston rod 42 is articulated with a second articulated rod 47. One end of the second articulated rod 47 away from the sliding plate 46 is articulated to the lower side of the connecting frame 32. A through hole 45 is provided on the outer wall of the air bag 44, and the through hole 45 matches the first through hole 341. The sliding plate 46 is penetrated by the round rod 333 and is slidably connected to the round rod 333. When the moving plate 361 moves towards the connecting frame 32, the first articulated rod 35 drives the L-shaped rod 33 to rotate, and the second articulated rod 47 pulls the sliding plate 46 to slide upward. When the first articulated rod 35 pushes the L-shaped rod 33 to rotate around its articulated point with the connecting frame 32, it drives the anti-sway plate 34 to rotate. Under the action of the second articulated rod 47, the sliding plate 46 moves, driving the piston rod 42 to move upward, and then driving the piston plate 412 to move. The piston plate 412 squeezes the gas in the air chamber 41 into the air bag 44, causing the air bag 44 to expand. During the expansion of the air bag 44, the provided through hole 45 will gradually decrease, reducing the passing speed of the cryogenic liquid, causing the cryogenic liquid to move towards the direction close to the inner wall of the cargo hold of the anti-sway plate 34, further improving the anti-sway effect on the cryogenic liquid. The multiple protection designs reduce the damage risk of key components of the cargo hold and extend the service life of the cabin body 1 and the anti-sway mechanism 3.

[0047] Further, after the deep-sea liquid stops sloshing, under the action of the reset spring, it can drive the blocking member 36 to reset. Furthermore, the moving plate 361 drives the first articulated rod 35 to move, causing the L-shaped rod 33 to rotate and reset. Furthermore, under the action of the second articulated rod 47, the sliding plate 46 stably slides on the round rod 333. During the downward sliding process of the sliding plate 46, the piston plate 412 is driven to descend, so that the gas in the inflated airbag 44 can be squeezed into the air chamber 41 by the pressure of the deep-sea liquid.

[0048] During use, when the cryogenic liquid violently oscillates through the notch 22 of the baffle 2, the cryogenic liquid impacts the blocking member 36 to move. Under the action of the first damper 37 and the reset spring, the oscillation of the cryogenic liquid is blocked for the first time. At the same time, during the process of the blocking member 36 squeezing the reset spring to move, the first articulated rod 35 drives the L-shaped rod 33 to rotate, causing the anti-slosh plate 34 to move in the direction of the oncoming cryogenic liquid oscillation, further sloshing the cryogenic liquid.

[0049] At the same time, when the cryogenic liquid impacts the articulated plate 362 during oscillation, under the action of the arc spring and the second damper 363, it can buffer the impact of the cryogenic liquid, thereby protecting the articulated plate 362 and the moving plate 361. During the process of the moving plate 361 compressing the reset spring, when the first articulated rod 35 pushes the L-shaped rod 33 to rotate around its articulated point with the connecting frame 32, it drives the anti-slosh plate 34 to rotate. Under the action of the second articulated rod 47, the sliding plate 46 moves, driving the piston rod 42 to move upward, squeezing the gas in the air chamber 41 into the airbag 44, causing the airbag 44 to expand. During the expansion process of the airbag 44, the provided through-hole 45 will gradually decrease, reducing the passing speed of the cryogenic liquid, causing the cryogenic liquid to move in the direction of approaching the inner wall of the cargo hold of the anti-slosh plate 34, strengthening the sloshing of the cryogenic liquid.

[0050] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A cryogenic liquid filling marine cargo hold, comprising a hold body (1), wherein a baffle (2) is fixedly installed inside the hold body (1), and multiple groups of baffles (2) are provided. The multiple groups of baffles (2) are arranged in an equidistant array. It is characterized in that: Inside the cabin body (1), there is a sloshing prevention mechanism (3) and an auxiliary sloshing prevention component (4) for preventing the liquid from sloshing. The sloshing prevention mechanism (3) includes: A guiding rod (31), which is fixedly connected to the outer wall of the baffle (2), and a connecting frame (32) is fixedly connected to the outer wall of the guiding rod (31); An L-shaped rod (33), which is hinged to the outer wall of the connecting frame (32). A sloshing prevention plate (34) is fixedly connected to the bottom of the L-shaped rod (33). One end of the L-shaped rod (33) far from the connecting frame (32) is hinged to a first articulated rod (35); A blocking member (36), which is arranged at one end of the first articulated rod (35) far from the L-shaped rod (33). A first damper (37) is connected between the blocking member (36) and the connecting frame (32).

2. A cryogenic liquid filling marine cargo hold according to claim 1, characterized in that: The blocking member (36) is composed of a moving plate (361), an articulated plate (362) and a second damper (363). The moving plate (361) is fixed to the first damper (37). The moving plate (361) is elastically connected to the connecting frame (32) through a return spring. The moving plate (361) and the articulated plate (362) are elastically connected through an arc spring. The two ends of the second damper (363) are respectively fixedly connected to the moving plate (361) and the articulated plate (362). A chute opening (364) is formed on the outer wall of the moving plate (361), and the chute opening (364) matches the guiding rod (31).

3. A cryogenic liquid filling marine cargo hold according to claim 1, characterized in that: Multiple groups of the sloshing prevention mechanisms (3) are provided, and each group of the sloshing prevention mechanisms (3) is arranged between two baffle plates (2). Two sets of the L-shaped rods (33), sloshing prevention plates (34), first articulated rods (35) and blocking members (36) are provided in each group of the sloshing prevention mechanisms (3), and they are symmetrically arranged with respect to the center line of the connecting frame (32).

4. A cryogenic liquid filling marine cargo hold according to claim 2, characterized in that: A first fixing block (331) and a second fixing block (332) are fixedly connected to the outer wall of the L-shaped rod (33), and a round rod (333) is fixedly connected between the first fixing block (331) and the second fixing block (332).

5. A cryogenic liquid filling marine cargo hold according to claim 4, characterized in that: A first through hole (341) is formed on the outer wall of the sloshing prevention plate (34), and the bottom of the sloshing prevention plate (34) bends towards the side far from the auxiliary sloshing prevention component (4).

6. A cryogenic liquid filling marine cargo hold according to claim 5, characterized in that: The auxiliary sloshing prevention component (4) includes an air chamber (41), which is fixedly connected to the top of the sloshing prevention plate (34). The air chamber (41) is penetrated by a piston rod (42) and is slidably connected to the piston rod (42). The air chamber (41) is communicated with an air pipe (43). One end of the air pipe (43) far from the air chamber (41) is communicated with an airbag (44). One end of the piston rod (42) far from the air chamber (41) is fixedly connected to a sliding plate (46). One side of the sliding plate (46) far from the piston rod (42) is hinged to a second articulated rod (47), and one end of the second articulated rod (47) far from the sliding plate (46) is hinged to the lower side of the connecting frame (32).

7. A cryogenic liquid filling marine cargo hold according to claim 6, characterized in that: A through opening (45) is formed in the outer wall of the airbag (44), and the through opening (45) is matched with the first through hole (341). The sliding plate (46) is penetrated by the round rod (333) and is slidably connected to the round rod (333).

8. A cryogenic liquid filling marine cargo hold according to claim 6, characterized in that: A sealing ring (411) is arranged in the air chamber (41) to enhance the sealing performance when the piston rod (42) slides. A piston plate (412) is slidably connected in the air chamber (41), and the piston plate (412) is fixed to the piston rod (42).

9. A cryogenic liquid filling marine cargo hold according to claim 6, characterized in that: When the moving plate (361) moves towards the connecting frame (32), the first hinge rod (35) drives the L-shaped rod (33) to rotate, and the second hinge rod (47) pulls the sliding plate (46) to slide upwards.

10. A cryogenic liquid filling marine cargo hold according to claim 1, characterized in that: A second through hole (21) is formed in the outer wall of the baffle (2). A notch (22) is formed at the top of the baffle (2). A reinforcing member (23) is fixedly connected to the outer wall of the baffle (2), and the reinforcing member (23) is fixedly installed in the cabin body (1).

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