Hydrogen filling arm for ship and hydrogen filling system for ship suitable for large water level difference

Abstract

The application provides a ship hydrogen refueling arm and a ship hydrogen refueling system suitable for large water level difference. The four-bar linkage structure of the refueling arm framework provides support for the hydrogen refueling hose. The outer arm assembly is pulled to be close to the refueling ship to convey hydrogen. The counterweight assembly and the balance assembly in the four-bar linkage mechanism maintain the balance of the entire refueling arm framework, provide connection guarantee for long-distance high-pressure hydrogen hose refueling, and avoid the risks of damage, fracture and hydrogen leakage after fracture of the hose caused by large span.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-pressure hydrogen refueling for ships, and further relates to a hydrogen refueling arm for ships suitable for large water level difference and a hydrogen refueling system for ships. BACKGROUND

[0002] Hydrogen fuel is a good solution for carbon emission reduction and decarbonization in the shipping industry, and its application range will gradually expand with the maturity of fuel application technology and the perfection of supporting facilities. Hydrogen-powered ships are usually used in lakes, inland rivers, offshore, etc., mainly in the form of passenger ships, ferries, inland cargo ships, tugboats, etc.; the development of large hydrogen-powered ships such as offshore engineering ships, offshore roll-on / roll-off ships, super yachts, etc. is the current international trend.

[0003] Compared with conventional ship fuel medium refueling, high-pressure hydrogen refueling for ships has the risks of high pressure and easy leakage; compared with land vehicle refueling, it has the problems of long distance, large envelope range, and long refueling time; and some wharfs have large water level difference, etc. These risks and problems bring certain risks to ship high-pressure hydrogen refueling. SUMMARY

[0004] In view of the problems of difficult high-pressure hydrogen refueling for ships and poor safety in the prior art, the present application provides a hydrogen refueling arm for ships suitable for large water level difference, which sets a four-bar linkage structure refueling arm skeleton to provide support for the hydrogen refueling hose, pulls the outer arm assembly to make it close to the refueling ship to deliver hydrogen, and the counterweight assembly and the balance assembly in the four-bar linkage mechanism maintain the balance of the entire refueling arm skeleton, providing connection protection for long-distance high-pressure hydrogen hose refueling, avoiding damage, rupture, and hydrogen leakage after rupture caused by large span, etc.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A hydrogen refueling arm for ships suitable for large water level difference, comprising: a hydrogen refueling device and a refueling arm skeleton; the refueling arm skeleton comprises a counterweight assembly, a balance assembly, an inner arm assembly, and an outer arm assembly, which are connected by a rotating assembly to form a four-bar linkage structure, and the center of gravity of the four-bar linkage structure is located on the inner arm assembly; the hydrogen refueling device comprises a hydrogen refueling hose, and the hydrogen refueling hose is arranged along the inner arm assembly and the outer arm assembly.

[0007] In some embodiments, it further comprises: a stand column and a rotating shaft box, the bottom of the stand column is fixedly provided; the rotating shaft box is rotatably connected to the top end of the stand column through a first rotary support mechanism; and the rotating shaft box is rotatably connected to the center of gravity position on the inner arm assembly through a second rotary support mechanism.

[0008] In some embodiments, the rotating shaft box further comprises a damping assembly, the damping assembly comprising a slow descent disc and a brake; the slow descent disc is connected with the barycentric position on the inner arm assembly through a supporting flange to form a rotating structure; the brake is used for clamping the outer edge of the slow descent disc to dampen the rotation of the rotating structure.

[0009] In some embodiments, the brake is at least two, and the two brakes are oppositely arranged on both sides of the slow descent disc and fixed on the rotating shaft box.

[0010] In some embodiments, the hydrogen filling device further comprises a hydrogen filling gun, and an input end of the hydrogen filling gun is connected with an output end of the hydrogen filling hose.

[0011] In some embodiments, a telescopic pipe assembly is further included, one end of the telescopic pipe assembly is connected with a tail end of the outer arm assembly, and a hydrogen filling gun mounting seat for accommodating the hydrogen filling gun is arranged on the other end of the telescopic pipe assembly.

[0012] In some embodiments, a pull-off valve arranged on the hydrogen filling hose is further included.

[0013] In some embodiments, the telescopic pipe assembly comprises an inner cylinder, an outer cylinder and a tension spring arranged in the inner cylinder, the inner cylinder and the outer cylinder are both provided with an opening and a plug, the plug of the inner cylinder is connected with the tail end of the outer arm assembly, and the opening of the inner cylinder is sleeved in the opening of the outer cylinder; the two ends of the tension spring are connected with the plugs of the inner cylinder and the outer cylinder respectively; and the hydrogen filling gun mounting seat is arranged on the outer cylinder.

[0014] In some embodiments, the inner arm assembly and the outer arm assembly are both planar truss structures.

[0015] The application further provides a ship hydrogen filling system, which comprises a hydrogen filling machine for providing hydrogen fuel and the ship hydrogen filling arm.

[0016] Compared with the prior art, the ship hydrogen filling arm suitable for large water level difference has the following beneficial effects:

[0017] 1. The four-bar linkage filling arm framework provided by the application provides support for the hydrogen filling hose, provides connection guarantee for long-distance high-pressure hydrogen filling, and avoids risks such as damage, fracture and hydrogen leakage after fracture of the hose caused by large span;

[0018] 2. The four-bar linkage structure arranged in the application can rotate around the axis of the stand column, expands the filling range, and meets the filling needs of different directions;

[0019] 3、The telescopic pipe assembly is arranged at the end of the outer arm assembly, and is in a retracted state normally to avoid interference with site guardrails, ship parts and the like caused by the overlength of the end of the outer arm assembly; the telescopic pipe assembly is stretched by pulling the pull rope on the outer cylinder of the telescopic pipe assembly to facilitate removal of the hydrogen filling gun, and the telescopic pipe assembly further increases the envelope range of the ship hydrogen filling arm;

[0020] 4、The damping structure is arranged in the rotating shaft box, the slow descent disc in the damping assembly is connected with the inner arm assembly, the weight of the end of the outer arm assembly is reduced when the hydrogen filling gun is removed, at this time, the brake in the damping assembly slows down the rotation of the inner arm assembly by clamping the outer edge of the slow descent disc, and the problem of instability of the balance structure after the hydrogen filling gun is removed during filling is avoided;

[0021] 5、The inner arm assembly and the outer arm assembly provided by the application are both designed in a frame structure, which overcomes the difficult problem of trim with a large force arm ratio, and realizes lightweight design of the filling arm, and ensures the safety performance of the filling arm. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above-mentioned characteristics, technical features, advantages and implementation modes of the application will be further described in the following in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0023] Figure 1 A structure schematic diagram of the ship hydrogen filling arm provided by the application is shown in the figure.

[0024] Figure 2 A perspective view of the rotating shaft box provided by the application is shown in the figure.

[0025] Figure 3 A front view of the rotating shaft box provided by the application is shown in the figure.

[0026] Figure 4 A top view of the rotating shaft box provided by the application is shown in the figure.

[0027] Figure 5 A side view of the rotating shaft box provided by the application is shown in the figure.

[0028] Figure 6 A structure schematic diagram of the telescopic pipe assembly provided by the application is shown in the figure.

[0029] Figure 7 A schematic diagram of the ship hydrogen filling arm provided by the application in a reset state is shown in the figure.

[0030] Figure 8 A schematic diagram of the ship hydrogen filling arm provided by the application when crossing a guardrail is shown in the figure.

[0031] Figure 9 A schematic diagram of the ship hydrogen filling arm provided by the application in a filling state is shown in the figure.

[0032] Figure 10 A schematic view of the hydrogen filling arm for ships provided by the present application at the maximum working range;

[0033] Figure 11 A schematic view of the four-bar linkage structure provided by the present application when being unfolded.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1 - a column; 2 - a counterweight assembly; 3 - a balance assembly; 4 - an inner arm assembly; 5 - an outer arm assembly; 6 - a hydrogen filling hose;

[0036] 7 - a rotating shaft box; 71 - a handrail; 72 - a box frame; 73 - a first rotary support mechanism; 74 - a locking block; 75 - a second rotary support mechanism; 76 - a support flange; 77 - a slow descent disc; 78 - a brake; 7478

[0037] 8 - a hydrogen filling gun; 9 - a break valve;

[0038] 10 - a telescopic pipe assembly; 101 - an inner cylinder; 102 - an inner cylinder plug; 103 - an outer cylinder; 104 - an outer cylinder plug; 105 - a tension spring; 106 - a hydrogen filling gun mounting seat;

[0039] 11 - a guardrail. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0041] In order to make the drawing simple, only the parts related to the invention are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0042] It should be further understood that the term "and / or" used in the specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0043] In this article, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0045] Embodiment 1

[0046] As Figure 1 shown, the present application provides a ship hydrogen filling arm suitable for large water level difference, which comprises a hydrogen filling device and a filling arm framework. Specifically:

[0047] The filling arm framework comprises a counterweight assembly 2, a balance assembly 3, an inner arm assembly 4 and an outer arm assembly 5. The four assemblies are connected by rotating assemblies two by two to form a movable four-bar linkage structure, and the center of gravity of the four-bar linkage structure is always located on the inner arm assembly 4.

[0048] A traction point is arranged on the tail end of the counterweight assembly 2 and the outer arm assembly 5, and the traction point of the counterweight assembly 2 is preferably arranged near the connection between the counterweight assembly 2 and the inner arm assembly 4.

[0049] In some embodiments, the filling arm framework further comprises a column 1 and a rotating shaft box 7, and the bottom of the column 1 is fixedly arranged on the shore base.

[0050] Preferably, the inner arm assembly 4 and the outer arm assembly 5 are both planar truss structures, and the design of the truss structure overcomes the problem of excessive force arm ratio balancing, i.e. the problem of the size ratio of the force arms on both sides of the inner arm assembly 4 with the column 1 as the center.

[0051] As Figures 2 to 5 shown, the rotating shaft box 7 is rotatably connected to the top end of the column 1 through a first rotary support mechanism 73, so that the four-bar linkage structure can rotate around the axis of the column 1, thereby increasing the filling range of the ship hydrogen filling arm.

[0052] The rotating shaft box 7 is rotatably connected to the center of gravity position on the inner arm assembly 4 through a second rotary support mechanism 75.

[0053] Specifically, in combination with Figure 11As shown, the center of gravity of the inner arm assembly 4 is hinged to the pivot box 7 at the hinge point O, one end of the counterweight assembly 2 is hinged to the leading end of the inner arm assembly 4 at the hinge point B, one end of the counterweight assembly 2 is hinged to the leading end of the balancing assembly 3 at the hinge point A, the trailing end of the balancing assembly 3 is hinged to the leading end of the outer arm assembly 5, the trailing end of the inner arm assembly 4 is hinged to the outer arm assembly 5 at the hinge point C, and when the four-bar linkage structure moves: the inner arm assembly 4 rotates around the hinge point O, thereby realizing large-amplitude action, the counterweight assembly 2 rotates around the hinge point B, pulls the balancing assembly 3, thereby driving the outer arm assembly 5 to rotate around the hinge point C to realize small-amplitude action.

[0054] The hydrogen filling device comprises a hydrogen filling hose 6, which is arranged along the column 1, the inner arm assembly 4 and the outer arm assembly 5 and is fixed to the inner arm assembly 4 and the outer arm assembly 5 by a pipe clamp, and a U-shaped bend is arranged at the movable joint of the inner arm assembly 4 and the outer arm assembly 5 as compensation.

[0055] Compared with directly using a hydrogen filling hose with a length of tens of meters to transport hydrogen, the filling arm framework provided by the present application provides support for the hydrogen filling hose 6 and connection guarantee for long-distance high-pressure hydrogen filling, thereby avoiding frequent bending and stretching of the hydrogen filling hose 6 due to large filling span, and avoiding violent collision and friction between the hydrogen filling hose 6 and obstacles such as rock walls, to prevent damage and rupture of the hydrogen filling hose 6.

[0056] The four-bar linkage structure rotates around the axis of the column 1 to the corresponding angle of the filling ship, pulls the traction point on the outer arm assembly 5, the inner arm assembly 4 rotates around the hinge point O towards the direction close to the filling ship, and drives the counterweight assembly 2 and the balancing assembly 3 to rotate to maintain the balance of the four-bar linkage structure, the four-bar linkage structure gradually unfolds, the output end of the hydrogen filling hose 6 moves to the area where the filling ship is located along with the outer arm assembly 5, and the inner arm assembly 4 continues to rotate around the hinge point O to the appropriate angle, so that the output end of the hydrogen filling hose 6 is lowered to the hydrogen filling port close to the ship to fill hydrogen into the ship. After filling is completed, the traction point on the counterweight assembly 2 is pulled, the inner arm assembly 4 rotates around the hinge point O away from the filling ship, the trailing end of the outer arm assembly 5 is driven away from the filling ship, and the four-bar linkage structure gradually folds.

[0057] In some embodiments, the hydrogen filling device further comprises a hydrogen filling gun 8, the input end of the hydrogen filling gun 8 is connected to the output end of the hydrogen filling hose 6, when the output end of the hydrogen filling hose 6 is lowered to the hydrogen filling port of the ship, the operator connects the hydrogen filling gun 8 to the hydrogen filling port of the ship, hydrogen is transported from the hydrogen filling machine on the shore base to the hydrogen filling gun 8 through the hydrogen filling hose 6, and then the hydrogen filling gun 8 fills hydrogen into the ship.

[0058] In some embodiments, the hydrogen filling device further comprises a pull-off valve 9 arranged on the hydrogen filling hose 6, preferably, the pull-off valve 9 is fixed at the tail end of the outer arm assembly 5, when an accident occurs, for example, after the ship is filled with hydrogen, the hydrogen filling gun 8 is not pulled out, and the ship is driven away, at this time, the pull-off valve 9 can be pulled off, the pull-off valve 9 instantaneously cuts off the hydrogen filling hose 6 connected at both ends, preventing hydrogen leakage, and fixing the pull-off valve 9 at the tail end of the outer arm assembly 5 can also ensure that the pull-off valve 9 will not directly rebound and collide with the ship under the action of the pulling force of the hydrogen filling hose 6, avoiding damage to the ship body.

[0059] Embodiment 2

[0060] Based on the embodiment 1, the embodiment provides a mounting structure of the hydrogen filling gun: the ship hydrogen filling arm is further provided with a telescopic pipe assembly 10, one end of the telescopic pipe assembly 10 is connected with the tail end of the outer arm assembly 5, the other end of the telescopic pipe assembly 10 is provided with a hydrogen filling gun mounting seat 106 for accommodating the hydrogen filling gun 8, and during filling, the telescopic pipe assembly 10 is pulled out to remove the hydrogen filling gun 8.

[0061] In some embodiments, as shown in Figure 6 the telescopic pipe assembly 10 comprises an inner cylinder 101, an outer cylinder 103 and a tension spring 105 arranged in the inner cylinder 101, the inner cylinder 101 and the outer cylinder 103 are each provided with an opening and a plug, the inner cylinder plug 102 is connected with the tail end of the outer arm assembly 5 through a pin, the opening of the inner cylinder 101 is sleeved in the outer cylinder 103 through the opening of the outer cylinder 103, and the two ends of the tension spring 105 are respectively connected with the inner cylinder plug 102 and the outer cylinder plug 104.

[0062] The outer cylinder 103 is provided with a hydrogen filling gun mounting seat 106, and the outer cylinder plug 104 is provided with a pull rope.

[0063] When hydrogen is not needed to be filled, the telescopic pipe assembly 10 is in a vertical state, the tension spring 105 is in a contracted state, and the hydrogen filling gun 8 is mounted on the hydrogen filling gun mounting seat 106, avoiding interference with site guardrails, ship parts and the like caused by the overlong end of the filling arm skeleton.

[0064] When the outer arm assembly 5 moves to the area close to the filling ship, the operator pulls the pull rope connected to the outer cylinder plug 104, the outer cylinder 103 moves downward, facilitating the removal of the hydrogen filling gun 8 for filling the ship, and after the pull rope is released, the outer cylinder 103 automatically retracts under the action of the tension spring 105, and the setting of the telescopic pipe assembly 10 further increases the envelope range of the ship hydrogen filling arm.

[0065] Embodiment 3

[0066] Based on the above embodiments, the embodiment provides a specific structure of the rotating shaft box 7: combined withFigures 2 to 5 As shown, the rotating shaft box 7 comprises a box frame 72, a handrail 71 arranged on the box frame 72, and a locking block 74 arranged at the bottom of the box frame 72. When the four-bar linkage structure rotates around the axis of the stand column 1, the locking block 74 is used to lock any position of the four-bar linkage structure within the rotation range of the four-bar linkage.

[0067] In order to avoid the imbalance of the entire refueling arm skeleton structure caused by the removal of the hydrogen filling gun 8 during refueling, a damping mechanism is arranged at the rotating shaft box assembly 3 to balance the weight loss when the hydrogen filling gun is removed.

[0068] The rotating shaft box 7 is also provided with a damping assembly, which comprises a slow descent disc 77 and a brake 78. The brake 78 clamps the outer edge of the slow descent disc 77 to dampen the rotation of the rotating structure.

[0069] Preferably, the brake 78 is at least two, and the two brakes 78 are oppositely arranged on both sides of the outer edge of the slow descent disc 77 and are fixed on the box frame 72 of the rotating shaft box 7.

[0070] The slow descent disc 77 is connected with the gravity center position on the inner arm assembly 4 through the support flange 76 to form a rotating structure. Preferably, the support flange 76 passes through the inner ring of the second rotary support structure 75 and is connected with the gravity center position on the inner arm assembly 4.

[0071] When the hydrogen filling gun 8 is removed from the hydrogen filling gun mounting seat 106, the tail end gravity of the outer arm assembly 5 is reduced, or at this time the brake 78 clamps the outer edge of the slow descent disc 77 to slow down the rotation of the rotating structure, thereby slowing down the descent speed of the outer arm assembly 5, so that the four-bar linkage structure is more balanced and stable.

[0072] Embodiment 4

[0073] On the basis of the above-mentioned embodiments, the present embodiment provides a marine hydrogen refueling system, which comprises the marine hydrogen refueling arm and a hydrogen filling machine arranged on the shore base, and the hydrogen filling machine is connected with the input end of the hydrogen refueling hose 6.

[0074] Figure 7 is a schematic diagram of the marine hydrogen refueling arm in the reset state. The refueling arm skeleton is fixedly arranged on the shore base through the stand column 1, and the four-bar linkage structure is completely folded in the reset state.

[0075] Figure 8 is a schematic diagram of the marine hydrogen refueling arm crossing the guardrail, combined with Figure 11 As shown, the inner arm assembly 4 is driven to rotate around the hinge point O by a certain angle, and the tail end of the outer arm assembly 5 is moved to the direction of the refueling ship across the guardrail 11.

[0076] Figure 9is a schematic view of the ship hydrogen filling arm when filling, the ship to be filled is parked in the envelope range of the ship hydrogen filling arm, when the outer arm assembly 5 crosses the guardrail 11, the inner arm assembly 4 continues to rotate around the hinge point O, the angle and height of the outer arm assembly 5, the counterweight assembly 2 and the balance assembly 3 are changed, the four-bar linkage structure is gradually unfolded, the tail end of the outer arm assembly 5 approaches the ship to be filled, the hydrogen filling gun 8 is lowered to the ship filling port, the operator on the ship removes the hydrogen filling gun 8 and connects it with the ship filling port to fill.

[0077] Figure 10 is a schematic view of the ship hydrogen filling arm when filling, the ship to be filled is parked in the envelope range of the ship hydrogen filling arm, when the outer arm assembly 5 crosses the guardrail 11, the inner arm assembly 4 continues to rotate around the hinge point O, the angle and height of the outer arm assembly 5, the counterweight assembly 2 and the balance assembly 3 are changed, the four-bar linkage structure is gradually unfolded, the tail end of the outer arm assembly 5 approaches the ship to be filled, the hydrogen filling gun 8 is lowered to the ship filling port, the operator on the ship removes the hydrogen filling gun 8 and connects it with the ship filling port to fill. Figure 7 is a schematic view of the ship hydrogen filling arm when filling, the ship to be filled is parked in the envelope range of the ship hydrogen filling arm, when the outer arm assembly 5 crosses the guardrail 11, the inner arm assembly 4 continues to rotate around the hinge point O, the angle and height of the outer arm assembly 5, the counterweight assembly 2 and the balance assembly 3 are changed, the four-bar linkage structure is gradually unfolded, the tail end of the outer arm assembly 5 approaches the ship to be filled, the hydrogen filling gun 8 is lowered to the ship filling port, the operator on the ship removes the hydrogen filling gun 8 and connects it with the ship filling port to fill.

[0078] The above is only the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A hydrogen filling arm for ships suitable for large water level difference, characterized in that, comprising: a hydrogen filling device, a filling arm framework and a telescopic pipe assembly; the filling arm framework comprises a counterweight assembly, a balance assembly, an inner arm assembly and an outer arm assembly, which are connected by rotating assemblies to form a four-bar linkage structure, and the center of gravity of the four-bar linkage structure is located on the inner arm assembly; the hydrogen filling device comprises a hydrogen filling hose, which is arranged along the inner arm assembly and the outer arm assembly; one end of the telescopic pipe assembly is connected to the tail end of the outer arm assembly, and the other end of the telescopic pipe assembly is provided with a hydrogen gun mounting seat for accommodating a hydrogen gun; the telescopic pipe assembly comprises an inner cylinder, an outer cylinder and a tension spring arranged in the inner cylinder, the inner cylinder and the outer cylinder are each provided with an opening and a plug, the plug of the inner cylinder is connected to the tail end of the outer arm assembly, and the opening of the inner cylinder is sleeved in the outer cylinder through the opening of the outer cylinder; the two ends of the tension spring are respectively connected to the plugs of the inner cylinder and the outer cylinder; the outer cylinder is provided with the hydrogen gun mounting seat.

2. The hydrogen filling arm for ships according to claim 1, characterized in that, further comprising a stand and a rotating shaft box, the bottom of the stand is fixedly arranged; the rotating shaft box is rotatably connected to the top end of the stand through a first rotary support mechanism; the rotating shaft box is rotatably connected to the center of gravity position on the inner arm assembly through a second rotary support mechanism.

3. The hydrogen filling arm for ships according to claim 2, characterized in that, the rotating shaft box further comprises a damping assembly, the damping assembly comprises a slow descent disc and a brake; the slow descent disc is connected to the center of gravity position on the inner arm assembly through a support flange to form a rotating structure; the brake is used to clamp the outer edge of the slow descent disc to dampen the rotation of the rotating structure.

4. The hydrogen filling arm for ships according to claim 3, characterized in that, the brake is at least two, the two brakes are oppositely arranged on both sides of the slow descent disc and fixed on the rotating shaft box.

5. The hydrogen filling arm for ships according to claim 1, characterized in that, the hydrogen filling device further comprises the hydrogen gun, and the input end of the hydrogen gun is connected to the output end of the hydrogen filling hose.

6. The hydrogen filling arm for ships according to claim 5, characterized in that, further comprising: a pull-off valve arranged on the hydrogen filling hose.

7. The hydrogen filling arm for ships according to claim 1, characterized in that, the inner arm assembly and the outer arm assembly are both planar truss structures.

8. Marine hydrogen refueling system, characterized in that including: a hydrogen filling machine for providing hydrogen fuel and the hydrogen filling arm for ships according to any one of claims 1 to 7, and the input end of the hydrogen filling hose is connected to the hydrogen filling machine.

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