Dual-machine combined lifting device and method for lifting stacked LNG fuel tank

Abstract

The present application relates to a kind of double-machine combined lifting device and stacking LNG fuel tank hoisting method, double-machine combined lifting device includes: two groups of gantry crane, each group of gantry crane includes gantry beam, two groups of upper trolley respectively slidably arranged in the upper of gantry beam and a group of lower trolley slidably arranged in the lower of gantry beam;Two groups of transition spreader, a group of gantry crane corresponds a group of transition spreader, two groups of upper trolley are respectively connected at the two ends of transition spreader;And two groups of bearing spreader, the two ends of a group of bearing spreader are respectively connected at the lower trolley of a group of gantry crane and the transition spreader connected with the upper trolley of another group of gantry crane, bearing spreader is connected to stacking LNG fuel tank, the collaborative bearing of two groups of gantry crane is realized by two groups of transition spreader and two groups of bearing spreader;And form the four-point hoisting structure of cross arrangement, so that the load of fuel tank is evenly distributed to two groups of gantry crane, solve the problem of insufficient lifting capacity of single group of gantry crane.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a dual-machine combined lifting device and a method for lifting stacked LNG fuel tanks. Background Technology

[0002] Currently, ultra-large container ships typically use LNG fuel power systems. During the ship's construction, the LNG fuel tanks on board are usually arranged in a horizontal double-tank structure, that is, two liquid tanks are placed horizontally side by side in the fuel tank. This will occupy part of the cargo hold area in the horizontal direction, and since the space above the liquid tanks cannot be used to load cargo, the cargo hold's loading capacity is reduced, which brings significant constraints to the overall ship layout.

[0003] Furthermore, lifting LNG fuel tanks weighing thousands of tons onto ships is a significant challenge in the industry. Because the weight of the tanks far exceeds the rated lifting capacity of a single gantry crane, traditional lifting methods typically rely on multiple cranes using flexible wire ropes and lifting gear in combination. However, this combination presents several problems, such as a large overall height, reducing the effective lifting height of the cranes; uneven stress distribution at each lifting point, leading to off-center loading; and low positioning accuracy, hindering the positioning and installation of the fuel tank and fuel compartment, posing a significant safety risk. Summary of the Invention

[0004] Therefore, it is necessary to provide a dual-machine joint lifting device and a stacked LNG fuel tank lifting method to address the problems of existing dual-tank LNG fuel tanks occupying cargo hold space and the difficulty of lifting LNG fuel tanks weighing thousands of tons.

[0005] On one hand, this application provides a dual-machine combined lifting device for lifting stacked LNG fuel tanks, including: Two sets of gantry cranes, each set of gantry cranes including a gantry beam, two sets of upper trolleys slidably disposed above the gantry beam, and a set of lower trolleys slidably disposed below the gantry beam; two sets of transition spreaders, one set of gantry cranes corresponding to one set of transition spreaders, the two sets of upper trolleys respectively connected to both ends of the transition spreaders; and two sets of load-bearing spreaders, the two ends of one load-bearing spreader respectively connected to the lower trolley of one set of gantry cranes and the transition spreader connected to the upper trolley of the other set of gantry cranes, the load-bearing spreaders being used to connect to the stacked LNG fuel tank.

[0006] In one embodiment, the transition lifting device includes a transition lifting bar and a transition hook fixed below the transition lifting bar. The two upper trolleys are respectively connected to the two ends of the two transition lifting bars. Each set of the bearing lifting device includes a bearing lifting bar and a connecting pin fixed to one end of the bearing lifting bar. The connecting pin is connected to the transition hook.

[0007] In one embodiment, the upper trolley is equipped with an upper trolley pulley block and an upper trolley hook; the transition lifting device also includes two transition pins respectively fixed at both ends of the transition lifting block, and the two upper trolley hooks are respectively connected to the two transition pins.

[0008] In one embodiment, the lower trolley is equipped with a lower trolley pulley block and a lower trolley hook; each set of the bearing lifting device includes two connecting pins respectively fixed at both ends of the bearing lifting block, and the two connecting pins of each set of the bearing lifting device are respectively connected to the lower trolley hook of one set of gantry cranes and the transition hook connected to the upper trolley of another set of gantry cranes.

[0009] In one embodiment, two lifting points are provided below the support frame, each of which is equipped with a tank connecting rope and a weighing induction pin. The tank connecting rope is used to connect to the stacked LNG fuel tank.

[0010] In one embodiment, the load-bearing lifting device further includes two T-shaped side plates, which are respectively fixed to both sides of the load-bearing lifting rack.

[0011] On the other hand, this application also provides a method for hoisting stacked LNG fuel tanks, used to hoist stacked LNG fuel tanks using a dual-machine combined hoisting device as described above, the method comprising the steps of: The stacked LNG fuel tanks are transported to the hoisting station next to the dock; the stacked LNG fuel tanks include two C-shaped liquid tanks, which are vertically stacked and assembled into one unit; The stacked LNG fuel tank is connected to two gantry cranes via two sets of load-bearing spreaders and two sets of transition spreaders. Each gantry crane's two upper trolleys are connected to both ends of one set of transition spreaders, each transition spreader is connected to one end of each load-bearing spreader, and each gantry crane's lower trolley is connected to the other end of each load-bearing spreader. The stacked LNG fuel tank is connected to the load-bearing spreader. Using two sets of gantry cranes, the stacked LNG fuel tanks are lifted vertically into the ship's fuel tank, allowing them to connect with the pipelines in the fuel tank.

[0012] In one embodiment, the step of connecting the stacked LNG fuel tank to two gantry cranes via two sets of support lifting devices and two sets of transition lifting devices includes the following steps: The upper trolley hook of the upper trolley is connected to both ends of the transition lifting block of the transition lifting device through the transition pin of the transition lifting device; The transition hook of the transition spreader is connected to one end of the load-bearing lifting block of the load-bearing spreader via a connecting pin of the load-bearing spreader; The lower trolley hook is connected to the other end of the load-bearing lifting block via another pin of the load-bearing lifting device; and; The stacked LNG fuel tank is connected to the support hoisting rack via a hoisting rope attached to the tank body.

[0013] In one embodiment, the step of connecting the stacked LNG fuel tanks to the support hoisting platform via tank connection ropes includes the following steps: Measure the height between each lifting ring of the stacked LNG fuel tank and each lifting point of the supporting lifting block; and; Adjust the length of the tank's connecting rope to match the height between the lifting ring and the lifting point.

[0014] In one embodiment, the step of using two sets of gantry cranes to lift the stacked LNG fuel tanks into the ship's fuel tank in a vertically stacked state, and connecting the stacked LNG fuel tanks with the pipelines in the fuel tank, includes the following steps: The stacked LNG fuel tank is lifted from the transport vehicle using the upper trolley pulley block of the upper trolley and the lower trolley pulley block of the lower trolley. The stacked LNG fuel tank is moved to the top of the fuel tank by the synchronous lateral movement of the upper and lower trolleys; and The stacked LNG fuel tank is lowered into the fuel tank using the upper trolley pulley group and the lower trolley pulley group.

[0015] In one embodiment, in the step of lifting the stacked LNG fuel tanks into the ship's fuel tank in a vertically stacked state using two sets of gantry cranes, and connecting the stacked LNG fuel tanks with the pipelines in the fuel tank: The load-bearing capacity of each lifting point of the load-bearing structure is monitored in real time by a weighing sensor pin. Based on the load-bearing capacity of each lifting point, the height of the lifting ring corresponding to each lifting point is adjusted by the upper trolley pulley block and the lower trolley pulley block to ensure that the load-bearing capacity of each lifting point remains consistent.

[0016] In one embodiment, the step of transporting the stacked LNG fuel tank to the hoisting station at the dockside includes the following steps: Based on the location of the fuel tank within the vessel, plan the fuel tank parking area and the gantry crane berthing area at the dockside; and; The stacked LNG fuel tanks were transported to their designated parking location using a roll-on / roll-off transport vehicle.

[0017] The dual-machine joint lifting device of this application connects the stacked LNG fuel tank to two gantry cranes through two sets of transition spreaders and two sets of load-bearing spreaders, realizing the coordinated load-bearing of the two gantry cranes; and one set of load-bearing spreaders is lifted by the two gantry cranes respectively, forming a cross-arranged four-point lifting structure, so that the load of the fuel tank can be evenly distributed to the two gantry cranes, solving the problem of insufficient lifting capacity of a single gantry crane.

[0018] This application directly connects the transition hook to one end of each set of bearing lifting devices by connecting pins, eliminating the connecting rope between the transition lifting line and the bearing lifting line. This not only reduces the distance between the transition lifting line and the bearing lifting line, freeing up the occupied lifting height, but also reduces the self-weight of the transition lifting line and the bearing lifting line, reducing the ineffective load of the gantry crane, thereby improving the effective lifting height and rated load of the dual-machine combined lifting device. Attached Figure Description

[0019] Figure 1 A schematic diagram of a dual-machine combined lifting device provided for one embodiment of this application; Figure 2 A top view schematic diagram of a dual-machine combined lifting device according to the above embodiments of this application is shown; Figure 3 A schematic diagram of the load-bearing lifting device of the dual-machine combined lifting device according to the above embodiments of this application is shown; Figure 4 A side view schematic diagram of the load-bearing lifting device of the dual-machine combined lifting device according to the above embodiments of this application is shown; Figure 5 As shown Figure 1 The diagram shows a partial enlarged view of the double-click combined lifting device; Figure 6 As shown Figure 1 The diagram shows a partial enlarged view of the double-click combined lifting device; Figure 7 As shown Figure 1 The diagram shows a partial enlarged C-shaped schematic of the double-click combined lifting device. Figure 8 A schematic diagram of a stacked LNG fuel tank provided for one embodiment of this application; Figure 9 A schematic diagram illustrating the steps of a stacked LNG fuel tank hoisting method provided in one embodiment of this application; Figure 10 A schematic diagram illustrating the connection steps of a stacked LNG fuel tank hoisting method provided in one embodiment of this application; Figure 11 A schematic diagram of step S240 in the connection step of a stacked LNG fuel tank hoisting method provided in an embodiment of this application; Figure 12 A schematic diagram illustrating the lifting steps of a stacked LNG fuel tank lifting method according to an embodiment of this application; Figure 13 A schematic diagram illustrating the transportation steps of a stacked LNG fuel tank hoisting method provided in one embodiment of this application.

[0020] Figure label: 10. Gantry crane; 11. Gantry crane beam; 12. Upper trolley; 121. Upper trolley pulley block; 122. Upper trolley hook; 13. Lower trolley; 131. Lower trolley pulley block; 132. Lower trolley hook; 20. Transition lifting gear; 21. Transition lifting block; 22. Transition hook; 23. Transition pin; 30. Bearing lifting gear; 31. Bearing lifting block; 311. Lifting point; 32. Connecting pin; 33. Tank connecting rope; 34. Weighing induction pin; 40. Stacked LNG fuel tank; 41. C-shaped liquid tank; 42. Lifting ring. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Addressing the issues of existing dual-tank LNG fuel tanks occupying cargo hold space and the difficulty of hoisting LNG fuel tanks weighing thousands of tons, this application provides a dual-machine joint lifting device and a stacked LNG fuel tank hoisting method.

[0028] On the one hand, the dual-machine joint lifting device of this application can lift LNG fuel tanks of thousands of tons in a vertically stacked state by means of dual-machine joint lifting.

[0029] Specifically, please refer to Figure 1 and Figure 2The dual-crane lifting device may include two sets of gantry cranes 10, two sets of transition spreaders 20, and two sets of load-bearing spreaders 30. Each set of gantry cranes 10 may include a gantry beam 11, two sets of upper trolleys 12, and one set of lower trolleys 13. The two sets of upper trolleys 12 are slidably disposed above the gantry beam 11, and the one set of lower trolleys 13 is slidably disposed below the gantry beam 11. Each set of gantry cranes 10 corresponds to one set of transition spreaders 20, and the two sets of upper trolleys 12 are respectively connected to both ends of the transition spreader 20. The two ends of each set of load-bearing spreaders 30 are respectively connected to the lower trolley 13 of one set of gantry cranes 10 and the transition spreader 20 connected to the upper trolley 12 of the other set of gantry cranes 10. The load-bearing spreaders 30 are used to connect to the stacked LNG fuel tank 40.

[0030] Understandably, the dual-machine combined lifting device of this application connects the stacked LNG fuel tank 40 to two gantry cranes 10 via two sets of transition spreaders 20 and two sets of load-bearing spreaders 30, achieving coordinated load-bearing by the two gantry cranes 10. Furthermore, each load-bearing spreader 30 is lifted by one of the two gantry cranes 10, forming a cross-arranged four-point lifting structure, ensuring that the load of the fuel tank is evenly distributed to the two gantry cranes 10, thus solving the problem of insufficient lifting capacity of a single gantry crane 10.

[0031] Alternatively, in some embodiments, such as Figure 5 As shown, the transition spreader 20 includes a transition spreader 21 and a transition hook 22 fixed below the transition spreader 21. Two upper trolleys 12 are respectively connected to the two ends of the two transition spreaders 21. Each set of load-bearing spreaders 30 includes a load-bearing spreader 31 and a connecting pin 32 fixed to one end of the load-bearing spreader 31. The connecting pin 32 is connected to the transition hook 22. Due to the addition of two sets of transition spreaders 20 and two sets of load-bearing spreaders 30, the lifting height of the gantry crane 10 is occupied, and the spreaders themselves have a certain weight, causing the gantry crane 10 to bear an additional load. Therefore, this application directly connects the transition hook 22 to one end of each set of bearing lifting devices 30 through the connecting pin 32, eliminating the connecting rope between the transition lifting panel 21 and the bearing lifting panel 31. This not only reduces the distance between the transition lifting panel 21 and the bearing lifting panel 31 and releases the occupied lifting height, but also reduces the self-weight of the transition lifting panel 21 and the bearing lifting panel 31, reducing the ineffective load of the gantry crane 10, thereby improving the effective lifting height and rated load of the dual-machine combined lifting device.

[0032] Alternatively, in some embodiments, such as Figure 5 and Figure 7As shown, the upper trolley 12 is equipped with an upper trolley pulley block 121 and an upper trolley hook 122; the transition lifting device 20 also includes two transition pins 23 respectively fixed at both ends of the transition lifting platform 21, and the two upper trolley hooks 122 are respectively connected to the two transition pins 23. In this way, by raising and lowering the lifting rope through the upper trolley pulley block 121, the upper trolley hooks 122 and the transition pins 23 can drive the transition lifting platform 21 to rise and fall, realizing smooth control of the fuel tank lifting and lowering process; the transition pins 23 and the upper trolley hooks 122 adopt a rigid pin connection, which has a large load-bearing capacity, high reliability, and is convenient for quick assembly before lifting and disassembly and maintenance after operation. In addition, the two upper trolleys 12 are symmetrically connected to both ends of the transition hoisting block 21 through their respective upper trolley hooks 122, so that the total load of the transition hoisting device 20 and the supporting hoisting device 30 below it and the fuel tank is shared by the two upper trolleys 12, which effectively reduces the load borne by a single upper trolley 12 and its pulley block, and improves the safety and reliability of the gantry crane 10 operation.

[0033] Alternatively, in some embodiments, such as Figure 6 and Figure 7 As shown, the lower trolley 13 is equipped with a lower trolley pulley block 131 and a lower trolley hook 132; each set of bearing lifting devices 30 includes two connecting pins 32 respectively fixed at both ends of the bearing lifting platform 31. The two connecting pins 32 of each set of bearing lifting devices 30 are respectively connected to the lower trolley hook 132 of one set of gantry cranes 10 and the transition hook 22 connected to the upper trolley 12 of another set of gantry cranes 10. In this way, by winding and unwinding the lifting rope through the lower trolley pulley block 131, the lower trolley hook 132 and the connecting pins 32 can drive one end of the bearing lifting platform 31 to rise and fall. In coordination with the upper trolley pulley block 121, synchronous control can be achieved during the lifting and lowering of the fuel tank; the connecting pins 32 and the lower trolley hook 132 adopt a rigid pin connection, which has a large load-bearing capacity, high reliability, and is convenient for quick assembly before lifting and disassembly and maintenance after operation. In addition, the two connecting pins 32 of the load-bearing lifting plate 31 are respectively connected to the lifting ends of two different gantry cranes 10, forming a cross-load layout of the double gantry cranes 10, so that the total load of the fuel tank is shared by the two gantry cranes 10, effectively reducing the load borne by a single gantry crane 10 and increasing the rated load of the dual-machine joint lifting device.

[0034] Alternatively, in some embodiments, such as Figure 3 and Figure 4As shown, two lifting points 311 are provided below the supporting lifting platform 31. Each lifting point 311 is equipped with a tank connecting rope 33 and a weighing sensor pin 34. The tank connecting rope 33 is used to connect to the stacked LNG fuel tank 40. In this way, the fuel tank is supported by four tank connecting ropes 33, ensuring that the fuel tank is evenly stressed and has a stable posture during lifting and lowering, thereby reducing the tilting or shaking of the fuel tank. The weighing sensor pin 34 can monitor the load-bearing capacity of each lifting point 311 in real time. When the load-bearing capacity of a certain lifting point 311 deviates from the preset threshold, it can be adjusted by the upper trolley pulley group 121 or the lower trolley pulley group 131 to ensure that the force on the four tank connecting ropes 33 is even.

[0035] Optionally, in some embodiments, the supporting spreader 30 further includes two T-shaped side plates, which are respectively fixed to both sides of the supporting spreader 31. The T-shaped side plates provide windproof fastening measures, effectively limiting the swaying amplitude of the fuel tank in the horizontal plane and preventing large swaying of the fuel tank caused by strong winds or the lateral inertia of the crane. A certain safety gap is reserved between the T-shaped side plates and the fuel tank. During normal operation, the T-shaped side plates do not contact the fuel tank, and only play a limiting role when the swaying amplitude of the fuel tank exceeds the safety threshold, providing effective windproof protection.

[0036] Optionally, in some embodiments, the tank connecting rope 33 is a high-strength circular rope, and the load-bearing lifting bar 31 and the transition lifting bar 21 are made of Q690 material to reduce the overall weight of the transition lifting device 20 and the load-bearing lifting device 30.

[0037] Exemplarily, this application also provides a specific example of a dual-crane combined lifting device. This dual-crane combined lifting device includes two sets of gantry cranes 10, two sets of transition spreaders 20, and two sets of transition lifting platforms 21. The rated loads of the two sets of gantry cranes 10 are 900t and 1000t respectively, and the rated loads of the upper trolley 12 and lower trolley 13 of each set of gantry cranes 10 are both 450t; the rated loads of the two sets of transition spreaders 20 are both 450t, and the rated loads of the two sets of load-bearing spreaders 30 are both 600t. The load-bearing platform 31 of the load-bearing spreader 30 is equipped with two 350t × 12m tank connecting lifting ropes 33. The total weight of the transition spreaders 20 and load-bearing spreaders 30 is 430t, the weight of the load-bearing platform 31 is 185t, and the weight of the transition platform 21 is 30t. Since this application uses transition pins 23 and connecting pins 32 for connection, the lifting racks attached to each set of upper trolleys 12 or lower trolleys 13 are removed, and the weight of each removed lifting rack is 13.5t. When the weight of the stacked LNG fuel tank 40 is 1130t, the load rate of the dual-machine combined lifting device, upper trolley 12, and lower trolley 13 can be calculated according to the following formula: Dual-machine combined lifting device: (1130+430-13.5×6) / (900+1000)=0.78; Calculate the following formula for the trolley: (1130 / 4 + 185 / 2 + 30 - 13.5 × 2) / 900 = 0.42; Calculate the following value for the cart: (1130 / 4 + 185 / 2 - 13.5) / 450 = 0.80; It is evident that the dual-machine combined lifting device of this application is capable of lifting fuel tanks weighing over a thousand tons using two sets of thousand-ton-class gantry cranes.

[0038] On the other hand, such as Figure 8 and Figure 9 As shown, this application also provides a method for lifting stacked LNG fuel tanks, used to lift stacked LNG fuel tanks 40 using a dual-machine combined lifting device as described above. The method includes the following steps: S100. Transport the stacked LNG fuel tanks to the hoisting station next to the dock; wherein, the stacked LNG fuel tanks include two C-shaped liquid tanks, which are vertically stacked and assembled into one unit; S200. The stacked LNG fuel tank is connected to two gantry cranes via two sets of carrying spreaders and two sets of transition spreaders, wherein the two upper trolleys of each gantry crane are respectively connected to both ends of one set of transition spreaders, each set of transition spreaders is respectively connected to one end of each set of carrying spreaders, and the lower trolley of each set of gantry cranes is respectively connected to the other end of each set of carrying spreaders, and the stacked LNG fuel tank is connected to the carrying spreaders; and; S300: Using two sets of gantry cranes, the stacked LNG fuel tanks are lifted vertically into the ship's fuel tank, allowing them to connect with the pipelines in the fuel tank.

[0039] It is understood that the stacked LNG fuel tank hoisting method of this application adopts a vertical hoisting approach, vertically stacking and assembling two C-shaped liquid tanks 41 into a single unit to form a stacked LNG fuel tank. During the hoisting process, the stacked LNG fuel tanks maintain a vertically stacked state. Specifically, it can include three main steps: transportation, connection, and hoisting. Referring to step S100, in the transportation step, the vertically stacked and pre-outfitted stacked LNG fuel tanks 40 are transported from the assembly site or dry dock to the hoisting position next to the dry dock. Referring to step S200, in the connection step, the fuel tanks are connected to two sets of gantry cranes 10 respectively using two sets of lifting devices 30 and two sets of transition lifting devices 20. Referring to step S300, in the hoisting step, the fuel tanks are hoisted vertically stacked into the ship's fuel tank using the coordinated operation of the two sets of gantry cranes 10, and then lowered and installed, connecting the fuel tanks to the pipelines in the fuel tank. Thus, this application achieves the lifting of fuel tanks from land to ship using a dual-crane joint lifting method, solving the problem of insufficient lifting capacity of a single gantry crane 10. On the other hand, the vertically stacked C-shaped liquid tanks 41 can significantly reduce the horizontal occupied area while maintaining the same total volume, effectively improving the space utilization rate inside the ship.

[0040] Alternatively, in some embodiments, such as Figure 10 As shown, step S200, connecting the stacked LNG fuel tank to two gantry cranes via two sets of lifting supports and two sets of transition supports, may include the following steps: S210. The upper trolley hook of the upper trolley is connected to both ends of the transition lifting block of the transition lifting device through the transition pin of the transition lifting device. S220. The transition hook of the transition spreader is connected to one end of the load-bearing lifting block of the load-bearing spreader via a connecting pin of the load-bearing spreader. S230. The lower trolley hook of the lower trolley is connected to the other end of the load-bearing lifting block via another pin of the load-bearing lifting device; and; S240. The lifting ring of the stacked LNG fuel tank is connected to the support hoisting block via the tank body connecting rope.

[0041] Following the steps outlined above, the connection process is as follows: First, install the transition spreader 20, and connect the two upper trolley hooks 122 to the transition pins 23 at both ends of the transition lifting platform 21 using a shaft threader. Second, install the load-bearing spreader 30, and connect the lower trolley hook 132 to the connecting pin 32 at one end of the load-bearing platform 31 using a shaft threader, and connect the transition hook 22 to the other end of the load-bearing platform 31. Finally, connect both ends of each tank-connecting lifting rope 33 to the lifting point 311 below the load-bearing platform 31, and connect the other end to the corresponding lifting ring 42 of the stacked LNG fuel tank 40. Each tank-connecting lifting rope 33 can be used in a folded manner and connected to the lifting ring 42 by shackles. In this way, by connecting the connecting pin 32 and the transition pin 23, on the one hand, the lifting rope between the transition lifting platform 21 and the load-bearing lifting platform 31 is removed, significantly shortening the overall height of the lifting sling assembly and effectively releasing the occupied lifting height, allowing the gantry crane 10 to obtain a greater effective lifting height; on the other hand, the rigid pin connection eliminates the elastic elongation and swing deformation of the flexible lifting rope under load, significantly improving the structural rigidity and geometric stability of the entire lifting system, making the displacement control of the liquid tank more precise during lifting and lateral movement, thereby achieving high-precision alignment and installation between the liquid tank and the fuel tank support structure.

[0042] Alternatively, in some embodiments, such as Figure 11 As shown, step S240, connecting the stacked LNG fuel tank to the support hoisting frame via the tank connection rope, includes the following steps: S241. Measure the height between each lifting ring of the stacked LNG fuel tank and each lifting point of the supporting lifting block; and; S242. Adjust the length of the tank's connecting rope so that it matches the height between the lifting ring and the lifting point.

[0043] Thus, in the step of connecting the fuel tank via the tank-connecting rope 33, a step of measuring the height between the lifting ring 42 and the lifting point 311 and adjusting the length of the lifting rope is added. By pre-measuring the height between each lifting ring 42 and the lifting point 311, and adjusting the length of the tank-connecting rope 33 according to the measurement results, it is ensured that each tank-connecting rope 33 is subjected to uniform force after lifting, thereby improving the reliability of the lifting operation.

[0044] Alternatively, in some embodiments, such as Figure 12 As shown, step S300, using two sets of gantry cranes, involves lifting the stacked LNG fuel tanks into the ship's fuel tank in a vertically stacked state, and connecting the stacked LNG fuel tanks with the pipelines in the fuel tank. S310. The stacked LNG fuel tank is lifted from the transport vehicle by means of the upper trolley pulley block of the upper trolley and the lower trolley pulley block of the lower trolley. S320, by synchronously moving the upper trolley and the lower trolley laterally, the stacked LNG fuel tank is moved to the top of the fuel tank; and S330, The stacked LNG fuel tank is lowered into the fuel tank via the upper trolley pulley block and the lower trolley pulley block.

[0045] Referring to the above steps, during the hoisting of the fuel tank, the gantry crane beam 11 remains stationary. The fuel tank is vertically lifted and lowered through the coordinated adjustment of the upper trolley pulley block 121 and the lower trolley pulley block 131. The fuel tank is horizontally moved through the synchronous lateral movement of the upper trolley 12 and the lower trolley 13, ensuring that the fuel tank maintains a stable posture and does not tilt during the horizontal hoisting process.

[0046] Optionally, in some embodiments, in step S300, where the stacked LNG fuel tanks are vertically stacked and transported to the ship's fuel tank using two sets of gantry cranes, and the stacked LNG fuel tanks are connected to the pipelines in the fuel tank: the load-bearing capacity of each lifting point 311 of the load-bearing lifting block 31 is monitored in real time using a weighing-sensing pin 34, and the height of the lifting ring 42 corresponding to each lifting point 311 is adjusted according to the load-bearing capacity of each lifting point 311 using the upper trolley pulley block 121 and the lower trolley pulley block 131, so that the load-bearing capacity of each lifting point 311 remains consistent. For example, when the load-bearing capacity of a certain lifting point 311 is too low, the lifting point 311 is raised by adjusting the upper trolley pulley block 121 or the lower trolley pulley block 131, so that the lifting point 311 bears more load, thereby ensuring that the force on each lifting point 311 is uniform.

[0047] Alternatively, in some embodiments, such as Figure 13 As shown, step S100, transporting the stacked LNG fuel tank to the hoisting station next to the dock, includes the following steps: S110. Based on the location of the fuel tank within the vessel, plan fuel tank parking spaces and gantry crane berthing spaces at the dockside; and; S120. The stacked LNG fuel tank is transported to its designated parking location by a roll-on / roll-off transport vehicle.

[0048] Following the steps outlined above, based on the fuel tank's location within the ship, a designated parking spot for the fuel tank and a gantry crane are pre-planned at the dockside. The fuel tank is then transported by roll-on / roll-off to this parking spot, and the gantry crane 10 is positioned there, ensuring the fuel tank is accurately positioned for subsequent lifting operations. Roll-on / roll-off transport of the fuel tank can utilize a 48-axle, 4-power unit axle train unit. The fuel tank and its saddle are lifted, transferred, and parked as a whole at the designated parking spot. This combination of marking and positioning, along with roll-on / roll-off transport, reduces pre-lifting alignment time and improves overall operational efficiency.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A dual-machine combined lifting device for lifting stacked LNG fuel tanks, characterized in that, include: Two sets of gantry cranes, each set of gantry cranes includes a gantry beam, two sets of upper trolleys respectively slidably disposed above the gantry beam, and a set of lower trolleys slidably disposed below the gantry beam; Two sets of transition spreaders, one set of the gantry crane corresponding to one set of the transition spreaders, and two sets of upper trolleys respectively connected to both ends of the transition spreaders; and Two sets of lifting devices are provided. The two ends of one set of lifting devices are respectively connected to the lower trolley of one set of gantry cranes and the transition device connected to the upper trolley of the other set of gantry cranes to form a cross-arranged four-point lifting structure. The lifting devices are used to connect to the stacked LNG fuel tank. The transition lifting device includes a transition lifting bar and a transition hook fixed below the transition lifting bar. The two upper trolleys are respectively connected to the two ends of the two transition lifting bars. Each set of the bearing lifting device includes a bearing lifting bar and a connecting pin fixed to one end of the bearing lifting bar. The connecting pin is connected to the transition hook. The upper trolley is equipped with an upper trolley pulley block and an upper trolley hook; the transition lifting device also includes two transition pins respectively fixed at both ends of the transition lifting block, and the two upper trolley hooks are respectively connected to the two transition pins; The lower trolley is equipped with a lower trolley pulley block and a lower trolley hook; each set of the bearing lifting device includes two connecting pins respectively fixed at both ends of the bearing lifting block, and the two connecting pins of each set of the bearing lifting device are respectively connected to the lower trolley hook of one set of gantry cranes and the transition hook connected to the upper trolley of another set of gantry cranes.

2. The dual-machine combined lifting device according to claim 1, characterized in that, The support frame has two lifting points below it, each equipped with a tank connecting rope and a weighing sensor pin. The tank connecting rope is used to connect to the stacked LNG fuel tank.

3. The dual-machine combined lifting device according to claim 1, characterized in that, The load-bearing lifting device also includes two T-shaped side plates, which are respectively fixed on both sides of the load-bearing lifting rack.

4. A method for hoisting stacked LNG fuel tanks, characterized in that, A method for lifting stacked LNG fuel tanks using a dual-machine combined lifting device as described in any one of claims 1 to 3, the method comprising the steps of: The stacked LNG fuel tank is transported to the hoisting station next to the dock; the stacked LNG fuel tank includes two C-shaped liquid tanks, which are vertically stacked and assembled into one unit; The stacked LNG fuel tank is connected to two gantry cranes via two sets of load-bearing spreaders and two sets of transition spreaders. Each gantry crane's two upper trolleys are connected to both ends of one set of transition spreaders, each transition spreader is connected to one end of each load-bearing spreader, and each gantry crane's lower trolley is connected to the other end of each load-bearing spreader. The stacked LNG fuel tank is connected to the load-bearing spreader. Using two sets of gantry cranes, the stacked LNG fuel tanks are lifted vertically into the ship's fuel tank, allowing them to connect with the pipelines in the fuel tank.

5. The method for hoisting stacked LNG fuel tanks according to claim 4, characterized in that, The step of connecting the stacked LNG fuel tank to the two gantry cranes via two sets of supporting lifting devices and two sets of transition lifting devices includes the following steps: The upper trolley hook of the upper trolley is connected to both ends of the transition lifting block of the transition lifting device through the transition pin of the transition lifting device; The transition hook of the transition spreader is connected to one end of the load-bearing lifting block of the load-bearing spreader via a connecting pin of the load-bearing spreader; The lower trolley hook is connected to the other end of the load-bearing lifting block via another pin of the load-bearing lifting device; and The stacked LNG fuel tank is connected to the support hoisting rack via a hoisting rope attached to the tank body.

6. The method for hoisting stacked LNG fuel tanks according to claim 5, characterized in that, The step of connecting the stacked LNG fuel tanks to the support hoisting frame via the tank connection rope includes the following steps: Measure the height between each lifting ring of the stacked LNG fuel tank and each lifting point of the supporting lifting array; and Adjust the length of the tank's connecting rope to match the height between the lifting ring and the lifting point.

7. The method for hoisting stacked LNG fuel tanks according to claim 4, characterized in that, The step of using two sets of gantry cranes to lift the stacked LNG fuel tanks into the ship's fuel tank in a vertically stacked state, and connecting the stacked LNG fuel tanks with the pipelines in the fuel tank, includes the following steps: The stacked LNG fuel tank is lifted from the transport vehicle using the upper trolley pulley block of the upper trolley and the lower trolley pulley block of the lower trolley. The stacked LNG fuel tank is moved to the top of the fuel tank by the synchronous lateral movement of the upper trolley and the lower trolley. as well as The stacked LNG fuel tank is lowered into the fuel tank using the upper trolley pulley group and the lower trolley pulley group.

8. The method for hoisting stacked LNG fuel tanks according to claim 5, characterized in that, In the step of using two sets of gantry cranes to lift the stacked LNG fuel tanks into the ship's fuel tank in a vertically stacked state, and connecting the stacked LNG fuel tanks with the pipelines in the fuel tank: The load-bearing capacity of each lifting point of the load-bearing structure is monitored in real time by a weighing sensor pin. Based on the load-bearing capacity of each lifting point, the height of the lifting ring corresponding to each lifting point is adjusted by the upper trolley pulley block and the lower trolley pulley block to ensure that the load-bearing capacity of each lifting point remains consistent.

9. The method for hoisting stacked LNG fuel tanks according to claim 4, characterized in that, The steps for transporting the stacked LNG fuel tanks to the hoisting station next to the dock include the following steps: Based on the location of the fuel tank within the vessel, a fuel tank storage area and a gantry crane berthing area will be planned at the dockside; and The stacked LNG fuel tanks were transported to their designated parking location using a roll-on / roll-off transport vehicle.

Images