An economical pilot ladder combination device for large LNG ships and its usage method

Abstract

The present invention discloses an economical pilot ladder combination device for large LNG ships. The combination device is fixed on the raised platform of the side main deck of the large LNG ship, and includes a pilot ladder storage component fixed on the raised platform. The pilot ladder storage component is connected to the pilot ladder through a pilot ladder movable component. The structure of this device is simple, easy to adjust, and the connection and retraction of the pilot ladder are safe and reliable. At the same time, it relates to a method of using the economical pilot ladder combination device for large LNG ships. This method can lower and recover the pilot ladder at multiple positions, and by using a fixed winch and eyebolts and suspension cables at different positions to change the release position of the pilot ladder, there is no need to install moving tracks, feed motors, reducers and other components, saving costs and reducing the occupied space on the deck.

Description

Technical Field

[0001] The present invention relates to the field of large LNG ship design and construction, and particularly to an economical pilot ladder combination device for large LNG ships and a usage method thereof. Background Art

[0002] When a ship enters or exits a port, passes through a ship lock, or passes through some restricted waters, a pilot is required to guide the ship's navigation. When boarding the ship, the pilot usually uses a pilot ladder and a pilot ladder. Due to different draft depths or ship states of the ship, the placement position of the pilot ladder is also different. Traditionally, a manual method is used to lower and retract the pilot ladder. However, the pilot ladder is relatively heavy and requires at least 2 to 3 people to operate. The operation time is long, it is quite laborious, it is difficult to move, retract, and store, and it is easy to get entangled and knotted during manual collection, which is not convenient for subsequent use.

[0003] In the prior art, the Chinese utility model patent CN208907006U proposes a mobile pilot ladder winch for lowering and retracting the pilot ladder. The patent is equipped with a track for the winch. Before releasing the ladder, the winch is moved to an appropriate position on the track through a feed motor, so as to achieve the purpose of covering more positions with the pilot ladder. However, this patent needs to be equipped with components such as a winch track, a feed motor, and a reducer to realize the movement of the winch, resulting in a relatively high construction cost and occupying a large amount of deck space, which is not suitable for ships with a crowded deck, such as large LNG ships.

[0004] In addition, the Chinese invention patent 202210431402.1 proposes an installation method for an inverted pilot ladder, including the following steps: setting a ladder fixing component; setting a ladder retracting component; setting a pilot ladder, and the pilot ladder is detachably connected to the ladder fixing component and the ladder retracting component. However, this application needs to install a moving track and does not solve the lowering and retracting of the pilot ladder at multiple positions, which is essentially different from the present application. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies existing in the above prior art, and to provide an economical pilot ladder combination device for large LNG ships and a usage method thereof.

[0006] In order to achieve the above invention purpose, the technical solution provided by the present invention is as follows:

[0007] An economical pilot ladder combination device for a large LNG ship, the combination device is fixed on the raised platform of the side main deck of the large LNG ship, and includes a pilot ladder storage component fixed on the raised platform, and the pilot ladder storage component is connected to the pilot ladder through a pilot ladder movable component; the pilot ladder storage component includes a pilot ladder winch fixed on the raised platform, a winch drum is arranged in the pilot ladder winch, the pilot ladder is connected to the winch drum and stored in the winch drum; the pilot ladder movable component includes a recovery cable, a suspension cable and an embedded eye plate, one end of the recovery cable is connected to the winch drum through a shackle to lower the pilot ladder, and the other end of the recovery cable is connected to the pilot ladder through a shackle to recover the pilot ladder, one end of the suspension cable is connected to the fixed eye ring through a shackle, the other end of the suspension cable is connected to the pilot ladder through a shackle, and the pilot ladder is connected to the embedded eye plate through a nylon rope.

[0008] A further preferred technical solution is that a plurality of the fixed eye rings are fixed on the side deck, and the fixed eye rings are connected with the suspension cables.

[0009] A further preferred technical solution is that the embedded eye plate is arranged at the lower part of the outer plate of the side section, and the embedded eye plate is used to limit the lateral sway of the pilot ladder.

[0010] A further preferred technical solution is that the pilot ladder winch is a power device, a rotating shaft is arranged in the winch drum, and the pilot ladder is lowered and recovered around the rotating shaft.

[0011] A further preferred technical solution is that the raised platform is fixed on the side main deck, with a height of 2500 cm. The passage of the side main deck is below the raised platform for personnel to pass through.

[0012] A further preferred technical solution is that square tube supports are arranged below the raised platform, the bottom ends of the square tube supports are fixed on both sides of the side main deck, and the upper ends of the square tube supports are connected to the diamond plate on the surface of the raised platform for installing the pilot ladder winch.

[0013] A further preferred technical solution is that a pilot ladder guide frame is arranged outside the raised platform, a protective railing is arranged around the raised platform, and a straight ladder from the side main deck to the raised platform is arranged inside the raised platform.

[0014] A further preferred technical solution is a method for using an economical pilot ladder combination device for a large LNG ship, which is characterized by including the following steps:

[0015] S1. The pilot ladder is stored on the pilot ladder winch, and the pilot ladder winch is fixed on the raised platform of the main deck on the side of the LNG ship. Before the pilot ladder is released, according to the different draft depths of the ship under full load or light load, a suspension cable of an appropriate length is selected. When the shackle of the pilot ladder is lowered to the main deck, the suspension cable is connected to the fixed eye ring and the pilot ladder.

[0016] S2. During the release of the pilot ladder, first, the retrieval cable is in a taut state, and the suspension cable is in a slack state. As the drum of the pilot ladder winch rotates, the pilot ladder continues to be lowered, the suspension cable gradually tends to be taut, and the retrieval cable tends to be slack.

[0017] S3. Under the action of the lateral component force of the suspension cable, the pilot ladder generates a lateral offset, so as to achieve the effect of laterally moving the pilot ladder to the use position.

[0018] S4. When the load with the pilot ladder is completely transferred to the suspension cable, the pilot ladder is fixed to the embedded eye plate with a nylon rope to limit the lateral sway of the pilot ladder.

[0019] S5. When the use of the pilot ladder is completed, the nylon rope connected to the embedded eye plate is loosened, and the pilot ladder winch is retrieved. When the shackle of the ladder rises back to the main deck on the side of the ship, the suspension cable is disengaged, and the ladder continues to be retrieved until it is stored in the pilot ladder winch.

[0020] The economic pilot ladder combination device and its using method for a large LNG ship of the present invention have achieved the following beneficial effects in the practice of shipbuilding:

[0021] (1) The economic pilot ladder combination device and its using method for a large LNG ship of the present invention can lower and retrieve the pilot ladder at multiple positions. By using a fixed winch to tow the pilot ladder suspended at different positions, it is not necessary to install moving tracks, feed motors, reducers and other components, saving costs and reducing the occupied space on the deck.

[0022] (2) The economic pilot ladder combination device and its using method for a large LNG ship of the present invention can achieve the purpose of lateral offset of the pilot ladder through the traction of the suspension cable and the retrieval cable.

[0023] (3) The economic pilot ladder combination device for a large LNG ship of the present invention is provided with multiple fixed eye rings for fixing the suspension cable and various lengths of suspension cables, which is convenient for flexible adjustment according to the actual situation on site.

[0024] (4) The economic pilot ladder combination device for a large LNG ship of the present invention has a simple structure, convenient adjustment, safe and reliable connection, retraction and deployment of the pilot ladder. At the same time, it saves deck space, alleviates the congestion of some ship decks, and reduces the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 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 these drawings.

[0026] Figure 1 FIG. is a schematic diagram of the economic pilot ladder combination device for a large LNG ship of the present invention.

[0027] Figure 2 FIG. is a schematic diagram of the pilot ladder after movement of the economic pilot ladder combination device for a large LNG ship of the present invention.

[0028] Figure 3 FIG. is a schematic diagram of different positions of the pilot ladder of the economic pilot ladder combination device for a large LNG ship of the present invention and its usage method.

[0029] Figure 4 FIG. is a schematic diagram of the cooperation between the economic pilot ladder combination device for a large LNG ship of the present invention and the pilot ladder.

[0030] The reference numerals in the figures are shown as:

[0031] Pilot ladder winch 1, lifting platform 2, recovery cable 3, suspension cable 4, fixed eye loop 5, pilot ladder 6, embedded eye plate 7 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the following further describes the present invention in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0033] The deck space of a large LNG ship is limited. Due to different ship draft depths or ship states, the placement positions of the pilot ladder are different. How to achieve the coverage of different positions by the pilot ladder in a limited space, so that the ship can meet the needs of the pilot to board safely at different draft depths under full load or no load, while saving deck space, an economic pilot ladder combination device and usage method for a large LNG ship have been developed.

[0034] As Figure 1-2As shown in the figure, an economical pilot ladder combination device for a large LNG ship. This combination device is fixed on the raised platform of the main deck on the side of the large LNG ship, and includes a soft ladder storage component fixed on the raised platform. The soft ladder storage component is connected to the pilot ladder through a soft ladder movable component; the soft ladder storage component includes a soft ladder winch 1 fixed on the raised platform. There is a winch drum inside the soft ladder winch 1. The pilot ladder 6 is connected to the winch drum and stored inside the winch drum. The raised platform 2 is supported by square tubes, and the platform surface of the raised platform 2 is a checker plate supported by I-beams, which is used to install the pilot ladder winch. There is a soft ladder guide frame outside the raised platform 2, a protective railing is provided around the raised platform 2, and a ladder from the deck to the platform is provided inside the raised platform 2. The raised platform 2 is slightly larger than the winch to leave an operating space, and the platform height 2 is 2500 cm to ensure a passing headroom of more than 2200 cm below.

[0035] The soft ladder movable component includes a recovery cable 3, a suspension cable 4 and an embedded eye plate 7. One end of the recovery cable 3 is connected to the winch drum through a shackle to lower the pilot ladder 6, and the other end of the recovery cable 3 is connected to the pilot ladder 6 through a shackle to recover the pilot ladder 6. One end of the suspension cable 4 is connected to the fixed eye ring 5 through a shackle, and the other end of the suspension cable 4 is connected to the pilot ladder 6 through a shackle. The pilot ladder 6 is connected to the embedded eye plate 7 through a nylon rope.

[0036] The present invention uses the component force generated by gravity along the direction of the rope to laterally offset the pilot ladder, solves the problem of lowering and recovering the pilot soft ladder at multiple positions, and meets the needs of the pilot to safely board the ship when the ship is in different drafts and different states.

[0037] When gravity acts on each part of the recovery cable 3 and the suspension cable 3, the recovery cable 3 or the suspension cable 4 acts like a fulcrum to generate a concentrated force, thus forming a taut state. At the same time, because the recovery cable 3 and the suspension cable 4 are elastic, gravity can extend from the high point to the low point, and the component force generated by gravity along the direction of the rope increases the strength and stability of the recovery cable 3 and the suspension cable 4.

[0038] Sling loops and shackles are provided at both ends of the recovery cable 3 and the suspension cable 4, and are connected to other components through shackles. The soft ladder winch 1 is fixed on the raised platform 2, and the winch drum is connected to the recovery cable 3 through a shackle. The recovery cable 3 is connected to the pilot ladder 6 through a shackle, and the pilot ladder 6 is lowered and recovered. The suspension cable 4 is usually stored on the deck. When in use, one end is connected to the fixed eye ring 5 through a shackle, and the other end is connected to the pilot ladder 6 through a shackle. The pilot ladder 6 is connected to the embedded eye plate 7 through a nylon rope. The raised platform 2 is fixed on the side deck, and people can pass below.

[0039] An embedded eye plate 7 is provided at the lower part of the side shell plating. When the pilot ladder 6 is lowered to the predetermined position, it is fixed to the embedded eye plate 7 with a nylon rope to restrict the lateral sway of the pilot ladder 6.

[0040] As Figure 3 shown, before the pilot ladder 6 is released, a soft ladder suspension cable 4 of appropriate length is selected according to the actual draft condition. When the shackle of the pilot ladder 6 is lowered to the main deck, the suspension cable 4 connects the fixed eye ring 5 and the pilot ladder 6. During the release process of the pilot ladder 6, first, the recovery cable 3 is in a taut state, and the suspension cable 4 is in a slack state; as the drum of the soft ladder winch 1 rotates, the pilot ladder 6 continues to be lowered, and the suspension cable 4 gradually tends to be taut, while the recovery cable 3 tends to be slack. Under the action of the lateral component force of the suspension cable 4, the pilot ladder 6 generates a lateral offset, thus achieving the effect of the lateral movement of the pilot ladder 6 to the use position. When the load of the pilot ladder 6 is completely transferred to the suspension cable 4, it is fixed to the embedded eye plate 7 with a nylon rope to restrict its lateral sway and improve the safety of boarding the ship.

[0041] Specifically, it also relates to a method for using an economical pilot ladder combination device for a large LNG ship, which includes the following steps:

[0042] S1, The pilot ladder 6 is stored on the soft ladder winch 1, and the soft ladder winch is fixed on the raised platform 2 of the main deck on the side of the LNG ship. Before the pilot ladder 6 is released, according to the different draft depths of the ship under full load or no load, the length of the suspension cable is selected. Since the placement position of the pilot ladder is different when the draft depth or the ship's state is different, the appropriate length of the suspension cable 4 needs to be selected. When the shackle of the pilot ladder 6 is lowered to the side main deck, the suspension cable 4 is connected to the fixed eye ring 5 and the pilot ladder 6;

[0043] S2, During the release process of the pilot ladder 6, first, the recovery cable 3 is in a taut state, and the suspension cable 4 is in a slack state; as the drum of the soft ladder winch 1 rotates, the pilot ladder 6 continues to be lowered, and the suspension cable 4 gradually tends to be taut, while the recovery cable 3 tends to be slack;

[0044] S3, Under the action of the lateral component force of the suspension cable 4, the pilot ladder 6 generates a lateral offset to achieve the effect of the lateral movement of the pilot ladder 6 to the use position;

[0045] S4, When the load of the pilot ladder 6 is completely transferred to the suspension cable 4, the pilot ladder 6 is fixed to the embedded eye plate 7 with a nylon rope to restrict the lateral sway of the pilot ladder 6;

[0046] S5. When the pilot ladder 6 is no longer in use, loosen the nylon rope connecting it to the embedded eye plate 7 and retract the pilot ladder winch 1. When the shackle of the pilot ladder rises back onto the side main deck, disconnect the suspension cable 3 and continue to retract the pilot ladder 6 until it is stored in the pilot ladder winch 1.

[0047] As Figure 4 shown, it is a schematic diagram of the cooperation between the pilot ladder at different positions and the pilot ladder. When the distance from the sea level to the boarding / disembarking location does not exceed 9 m, the pilot ladder can be used alone. The length of the pilot ladder should be able to reach the water surface from the boarding / disembarking location, fully considering all loading conditions, the worst ship trim, and an adverse list of 15°. When the distance from the sea level to the boarding / disembarking location exceeds 9 m, the accommodation ladder of the pilot ladder can be used in combination with the pilot ladder as the boarding and disembarking device for the pilot. At this time, the accommodation ladder of the pilot ladder should be set to bias towards the stern and arranged as parallel to the hull as possible within half of the ship's length in the middle of the ship and avoid the drain holes. The maximum horizontal use angle of the accommodation ladder of the pilot ladder should not exceed 45°, and it is ensured that the lower platform of the accommodation ladder of the pilot ladder is at least 5 m but not more than 9 m from the sea level.

[0048] An economic pilot ladder combination device and its usage method for a large LNG ship according to the present invention achieve the purpose of lateral offset of the pilot ladder by means of the traction of the suspension cable and the recovery cable. In addition, the present invention is provided with multiple eye plates for fixing the suspension cable and various lengths of the suspension cable, which is convenient for flexible adjustment according to the on-site situation in practical applications. Compared with the method of using a mobile winch to change the release position of the pilot ladder, the present invention does not require the installation of mobile tracks, feed motors, reducers and other components, saving costs and reducing the occupied space on the deck. It alleviates the congestion on the deck of large LNG ships.

[0049] The above is only one implementation mode of this invention patent. Based on the same idea, there can be other similar methods of replacement and structural substitutions, not limited to the steps and structural compositions already described. All in all, the protection scope of the present invention also includes other obvious transformations and substitutions for those skilled in the art.

Claims

1. An economical pilot ladder combination device for a large LNG ship, the combination device is fixed on the raised platform (2) of the main deck on the side of the large LNG ship, and is characterized in that, It includes a Jacob's ladder storage component fixed on the raised platform (2), and the Jacob's ladder storage component is connected to a pilot ladder (6) through a Jacob's ladder movable component; The Jacob's ladder storage component includes a Jacob's ladder winch (1) fixed on the raised platform (2). A winch drum is provided inside the Jacob's ladder winch (1), and the pilot ladder (6) is connected to the winch drum and stored inside the winch drum; The Jacob's ladder movable component includes a recovery cable (3), a suspension cable (4), and an embedded eye plate (7). One end of the recovery cable (3) is connected to the winch drum through a shackle to lower the pilot ladder (6), and the other end of the recovery cable (3) is connected to the pilot ladder (6) through a shackle to recover the pilot ladder (6). One end of the suspension cable (4) is connected to a fixed eye ring (5) through a shackle. A plurality of the fixed eye rings (5) are fixed on the side deck. The fixed eye ring (5) is connected to the suspension cable (4). The other end of the suspension cable (4) is connected to the pilot ladder (6) through a shackle. The pilot ladder (6) is connected to the embedded eye plate (7) through a nylon rope. The embedded eye plate (7) is provided at the lower part of the outer plate of the side section, and the embedded eye plate (7) is used to limit the lateral sway of the pilot ladder (6).

2. The economic pilot ladder combination device for a large LNG ship according to claim 1, characterized in that The Jacob's ladder winch (1) is a power device. A rotating shaft is provided inside the winch drum, and the pilot ladder (6) is lowered and recovered around the rotating shaft.

3. The economic pilot ladder combination device for a large LNG ship according to claim 1, characterized in that, The raised platform (2) is fixed on the side main deck and has a height of 2500 cm. A passage on the side main deck is provided below the raised platform (2) for personnel to pass through.

4. The economic pilot ladder combination device for a large LNG ship according to claim 1, characterized in that, Square tube supports are provided below the raised platform (2). The bottom ends of the square tube supports are fixed on both sides of the side main deck, and the upper ends of the square tube supports are connected to the diamond plate on the surface of the raised platform for installing the Jacob's ladder winch (1).

5. The economic pilot ladder combination device for a large LNG ship according to claim 1, characterized in that, A Jacob's ladder guide frame is provided outside the raised platform (2). A protective railing is provided around the raised platform (2). A straight ladder from the side main deck to the raised platform (2) is provided inside the raised platform (2).

6. The method of using an economic pilot ladder combination device for a large LNG ship according to any one of claims 1-5, characterized in that, It includes the following steps: S1. The pilot ladder (6) is stored on the Jacob's ladder winch (1). The Jacob's ladder winch is fixed on the raised platform (2) of the side main deck of the LNG ship. Before the pilot ladder (6) is released, select a suspension cable (4) of an appropriate length according to the different draft depths under full load or no load. When the shackle of the pilot ladder (6) is lowered to the main deck, connect the suspension cable (4) to the fixed eye ring (5) and the pilot ladder (6); S2. During the release of the pilot ladder (6), first, the recovery cable (3) is in a taut state, and the suspension cable (4) is in a slack state; as the drum of the Jacob's ladder winch (1) rotates, the pilot ladder (6) continues to be lowered, and the suspension cable (4) gradually becomes taut, while the recovery cable (3) tends to be slack; S3. Under the action of the lateral component force of the suspension cable (4), the pilot ladder (6) generates a lateral offset so that the pilot ladder (6) laterally moves to the use position; S4. When the load of the pilot ladder (6) is completely transferred to the suspension cable (4), fix the pilot ladder (6) to the embedded eye plate (7) with a nylon rope to restrict the lateral sway of the pilot ladder (6). S5. When the use of the pilot ladder (6) is completed, loosen the nylon rope fixed to the embedded eye plate (7), recover the pilot ladder winch (1). When the shackle of the ladder rises to the side main deck, disconnect the suspension cable (4), and continue to recover the ladder (6) until it is stored in the pilot ladder winch (1).

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