Center lifting marine crane capable of lodging and lodging method of center lifting marine crane

Abstract

The invention relates to the technical field of center hoisting crane ships, in particular to a lodging-resistant crane for a center hoisting ship and a lodging method of the lodging-resistant crane. In order to solve the technical problem that during navigation dispatching of a traditional center lifting ship crane, due to the fact that the height of a crane boom is too high, the height limiting requirement of a bridge cannot be met, the turnover crane boom assembly comprises a lower crane boom and an upper crane boom capable of relatively turning over, and a driving mechanism drives the upper crane boom to turn over to a set angle alpha; and lodging and resetting are realized by means of an auxiliary floating crane. The height of the crane in the lodging state is greatly reduced, the problem of navigation height limitation is effectively solved, the advantages of structural stability and shallow draft are kept during hoisting operation, the lodging process is operated cooperatively through the driving mechanism and the auxiliary floating crane without disassembly, operation is easy, convenient and safe, the ship dispatching efficiency is greatly improved, and the cost is reduced. And the application range in a bridge navigation height limiting area and a shallow water engineering area is expanded.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of center lifting crane ships, and particularly relates to a center lifting crane ship capable of being laid down and a laying down method thereof. BACKGROUND

[0002] At present, ship cranes are widely used in offshore engineering and port construction fields, but the traditional structure thereof is usually designed as a fixed lifting frame. During the navigation and dispatch of a ship, due to the high height of the lifting frame, which exceeds the height limit of bridges, overhead lines and the like, the ship cannot pass through smoothly, and needs to be disassembled or detoured, which seriously restricts the dispatch efficiency and application range of the ship. Although some existing technologies design foldable or detachable structures, these solutions are usually complex in structure, cumbersome in operation, and poor in stability during lifting operation, and cannot meet the demand of large-tonnage lifting operation. In addition, some solutions need a lot of preparation work before dispatch, which increases the operation cost and time. Therefore, there is an urgent need for a center lifting crane ship with simple structure, convenient operation, and the ability to effectively reduce the navigation height while ensuring the stability of lifting operation, so as to solve the problem of navigation height limit and expand the application range of this type of crane ship in the bridge navigation height limit area and shallow water engineering area. SUMMARY

[0003] The present application provides a center lifting crane ship capable of being laid down and a laying down method thereof. In view of the technical problem that the existing large-tonnage center lifting crane ship cannot meet the bridge height limit requirement due to the fixed lifting frame being too high and too large during navigation and dispatch, the present application provides a center lifting crane ship capable of being laid down, which is designed with a reversible lifting frame assembly, so that the height of the crane is greatly reduced in the laid-down state, effectively solving the problem of navigation height limit, expanding the application range of this type of crane ship in the bridge navigation height limit area and shallow water engineering area, and at the same time maintaining the shallow draft advantage and structural stress stability of the crane ship during lifting operation.

[0004] In a first aspect, a center lifting crane ship capable of being laid down is provided, which comprises a lifting frame assembly comprising a lower lifting frame and an upper lifting frame reversible relative to the lower lifting frame; a driving mechanism for driving the upper lifting frame to rotate relative to the lower lifting frame, so that the upper lifting frame is turned by a set angle a from the upright state, the set angle a being a critical value at which the upper lifting frame can continue to turn relative to the lower lifting frame under the action of its own weight.

[0005] In some embodiments, the driving mechanism is arranged on the side of the lifting frame assembly away from the turning direction.

[0006] On the one hand, the driving mechanism is arranged on the side of the lifting frame assembly away from the overturning direction, effectively avoiding the interference of the driving mechanism with the overturning path during the overturning process, ensuring the smoothness and compactness of the overturning operation, simplifying the maintenance and repair process, and improving the reliability and safety of the overall operation. On the other hand, the load demand of the driving mechanism is significantly reduced, enabling the use of a lower-cost and relatively smaller-power driving mechanism, which can achieve the preliminary overturning of the lifting frame assembly, i.e., overturning to a set angle α, and subsequent overturning can rely solely on the suspension of the auxiliary floating crane, thereby significantly reducing energy consumption and manufacturing costs, and optimizing the system economy and practicality.

[0007] In some embodiments, the driving mechanism includes an upper connecting seat arranged on the side of the upper lifting frame away from the overturning direction, a lower connecting seat arranged on the side of the lower lifting frame away from the overturning direction, and a telescopic mechanism with both ends hinged to the upper connecting seat and the lower connecting seat.

[0008] Through this embodiment, precise telescopic motion is achieved using a hinged structure, making the overturning process of the upper lifting frame smooth and controllable, significantly improving the overturning precision and mechanism durability, and avoiding the stress concentration problem caused by traditional rigid connection.

[0009] In some embodiments, the driving mechanism includes an upper connecting seat arranged on the side of the upper lifting frame away from the overturning direction, a lower connecting seat arranged on the side of the lower lifting frame away from the overturning direction, and a telescopic mechanism with both ends hinged to the upper connecting seat and the lower connecting seat.

[0010] Through this embodiment, a hinged structure is used to form a rotary connection pair, providing a stable rotary fulcrum for overturning, ensuring the accuracy of the overturning trajectory and the dynamic balance of the structure, and significantly reducing the shaking and accidental risks during the overturning process.

[0011] In some embodiments, the upper lifting frame and the lower lifting frame each include a frame structure arranged on the side away from the overturning direction.

[0012] Through this embodiment, not only the structural strength and rigidity of the lifting frame assembly as a whole are strengthened, the weight distribution is optimized, and a reliable support foundation is provided for the overturning operation, but also the structural stability during lifting operations is maintained. During the overturning process, the frame structure arranged on the side away from the overturning direction provides a counterweight for the upper lifting frame, effectively balancing the overturning moment, significantly enhancing the dynamic stability of the overturning process, reducing the shaking and overturning risks caused by the shift of the center of gravity, ensuring the safety and reliability of the overturning operation, and avoiding the complex design of additional counterweight devices, further improving the simplicity and economy of the system.

[0013] In some embodiments, a rear pre-tensioning device is further included for detachably connecting the upper lifting frame and the lower lifting frame.

[0014] Through the embodiment, quick and reliable fixing or disconnection during the process of tilting or resetting can be realized, the cumbersome steps of the traditional bolt fixing mode are avoided, the operation process is significantly simplified, the practicability and navigation efficiency of the crane are improved, and higher flexibility is provided for field application.

[0015] In a second aspect, a tilting method for a center-lifted ship-mounted crane is provided, including the following steps: The upper lifting frame of the lifting frame assembly is driven to rotate relative to the lower lifting frame by a driving mechanism, so that the upper lifting frame is flipped by a set angle alpha from the upright state, wherein the set angle alpha is a critical value at which the upper lifting frame can continue to flip relative to the lower lifting frame under its own weight; The driving force of the driving mechanism is unloaded, and the position of the upper lifting frame after being flipped by the set angle alpha is suspended and maintained by an auxiliary floating crane; The suspension force of the auxiliary floating crane is controlled, so that the upper lifting frame is flipped to a tilted state under the combined action of its own weight and the suspension force.

[0016] In some embodiments, before the step of driving the upper lifting frame of the lifting frame assembly to rotate relative to the lower lifting frame by the driving mechanism, a mechanical connection between the lower lifting frame and the upper lifting frame of the lifting frame assembly is also disconnected.

[0017] In some embodiments, a step of restoring the upper lifting frame from the tilted state to the upright state is further included: The upper lifting frame is flipped by the auxiliary floating crane until the upper lifting frame is flipped by a set angle alpha from the upright state; The driving force of the driving mechanism is loaded, and the suspension force of the auxiliary floating crane is unloaded, and the upper lifting frame is flipped to the upright state by the driving mechanism.

[0018] In some embodiments, a mechanical connection between the lower lifting frame and the upper lifting frame of the lifting frame assembly is also restored.

[0019] The technical solution provided by the present application has the following beneficial effects: By the reversible lifting frame assembly, the height of the crane is greatly reduced in the collapsed state, effectively solving the technical problem that the traditional center lifting ship cannot meet the bridge height limit requirement due to the over-high and over-large lifting frame in the navigation and dispatching process. The structure stress stability and shallow draft advantage are maintained during the lifting operation, and the lifting frame does not need to be disassembled to realize rapid navigation, which greatly improves the ship dispatching efficiency. The collapse and reset processes are completed through the cooperative operation of the driving mechanism and the auxiliary floating crane, which is simple, safe and reliable, avoiding the complex disassembly process and additional operation cost in the traditional scheme. Meanwhile, the application expands the application range of the crane in the bridge navigation height limit area and shallow water engineering area under the premise of ensuring the large tonnage lifting operation performance, and provides a more flexible and efficient lifting solution for offshore engineering and port construction. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The main view of the crane provided by the embodiment of the present application is provided. Figure 2 The main view of the lower lifting frame provided by the embodiment of the present application is provided. Figure 3 The main view of the upper lifting frame provided by the embodiment of the present application is provided. Figure 4 The partial schematic view of the crane overturning assembly provided by the embodiment of the present application is provided. Figure 5 The partial schematic view of the rotating structure provided by the embodiment of the present application is provided. Figure 6 The partial front view of the rear pre-tensioning device provided by the embodiment of the present application is provided. Figure 7 The partial cross-sectional view of the rear pre-tensioning device provided by the embodiment of the present application is provided. Figure 8 The schematic view of the crane in the collapsed state provided by the embodiment of the present application is provided.

[0022] Explanation of reference signs: 1, lifting frame assembly; 11, lower lifting frame; 111, lower lifting frame connecting seat; 112, diagonal strut; 113, rear pull rod; 114, connecting rod A; 115, connecting rod C; 116, front upright column; 12, upper lifting frame; 121, rear pull rod; 122, telescopic mechanism; 123, rotating shaft; 124, top load-bearing truss; 125, upright column; 126, diagonal strut A'; 127, connecting rod A'; 128, connecting rod B'; 2, turnover assembly; 21, rotating structure; 211, upper turnover hinge seat; 212, turnover pin shaft; 213, lower turnover hinge seat; 22, driving mechanism; 221, upper connecting seat; 222, telescopic mechanism; 223, lower connecting seat; 3, rear pre-tensioning device; 31, connecting pin shaft; 32, screw assembly; 33, through-center jack mechanism; 34, upper tensioning seat; 35, lower tensioning seat; 4, bow bracket. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0024] As shown in Figure 1 the present application provides a center lifting ship crane capable of overturning, comprising: a lifting frame assembly (1) comprising a lower lifting frame (11) and an upper lifting frame (12) capable of overturning relative to the lower lifting frame (11); a driving mechanism (22) for driving the upper lifting frame (12) to rotate relative to the lower lifting frame (11) so that the upper lifting frame (12) overturns by a set angle α from a vertical state.

[0025] Wherein, the angle α is the included angle between the upper lifting frame (12) and the plumb plane, and the set angle α is the critical value that the upper lifting frame (12) can continue to overturn relative to the lower lifting frame (11) under its own weight.

[0026] The lower lifting frame (11) is fixed in the middle of the ship body and connected with the upper lifting frame (12) through the turnover assembly (2), and the upper lifting frame (12) can rotate around the turnover assembly (2) to switch between the vertical state and the overturned state. The lower lifting frame (11) is fixed in the middle of the ship body, and the force is uniform during lifting, which can meet the requirement of the ship body draft.

[0027] As shown in Figure 1As shown, in some embodiments, it also includes: a bow bracket (4), which is used to support the overturned upper crane (12). The top of the bow bracket (4) is a box girder support and guide structure, and the lower part is a truss structure connected to the hull deck.

[0028] like Figure 1 As shown, in some embodiments, the drive mechanism (22) is located on the side of the lifting frame assembly (1) away from the flipping direction.

[0029] This embodiment addresses two key issues. First, by positioning the drive mechanism on the side of the lifting frame assembly opposite to the tilting direction, interference between the drive mechanism and the tilting path during tilting is effectively avoided. This ensures smooth tilting operation and structural compactness, while simplifying maintenance and repair procedures and improving overall operational reliability and safety. Second, it significantly reduces the load requirements of the drive mechanism, enabling the use of a lower-cost, lower-power drive mechanism to achieve the initial tilting of the lifting frame assembly—tilting it to a set angle α. Subsequent tilting can be achieved solely through the suspension of the auxiliary floating crane, thereby substantially reducing energy consumption and manufacturing costs and optimizing the system's economy and practicality.

[0030] like Figure 4 As shown, in some embodiments, the drive mechanism (22) includes: an upper connecting seat (221) disposed on the side of the upper lifting frame (12) away from the flipping direction; a lower connecting seat (223) disposed on the side of the lower lifting frame (11) away from the flipping direction; and a telescopic mechanism (222) whose two ends are respectively hinged to the upper connecting seat (221) and the lower connecting seat (223).

[0031] This embodiment utilizes a hinged structure to achieve precise telescopic movement, making the overturning process of the upper crane frame smooth and controllable, significantly improving the overturning accuracy and the durability of the mechanism, and avoiding the stress concentration problem caused by traditional rigid connections.

[0032] like Figure 4 As shown, both the upper connecting seat (221) and the lower connecting seat (223) are box-shaped structures with extended connecting lugs, respectively installed on the side of the column (125) of the upper lifting frame (12) and the side of the front column (126) of the lower lifting frame (11). The upper connecting seat (221) and the lower connecting seat (223) are hinged to the telescopic mechanism (222) by pins. The telescopic mechanism (222) can withstand thrust or tension loads within a set stroke range.

[0033] like Figure 4As shown in some embodiments, the device further comprises a rotating structure (21) and a driving mechanism (22) to form a turnover assembly (2); the rotating structure (21) comprises an upper turnover hinge base (211) arranged on one side of the upper lifting frame (12) facing the turnover direction, and a lower turnover hinge base (213) arranged on one side of the lower lifting frame (11) facing the turnover direction; the upper turnover hinge base (211) and the lower turnover hinge base (213) are connected by a hinge structure to form a rotating connection pair.

[0034] According to the embodiment, the hinge structure is used to form a rotating connection pair, which provides a stable rotating fulcrum for turnover, ensures the accuracy of the turnover track and the dynamic balance of the structure, and greatly reduces the shaking and accidental risks during turnover. In addition, the force transmission path of the turnover assembly is simple and clear, the structure is simple, the material consumption is small, and the turnover assembly can be permanently fixed on the lifting frame without disassembly.

[0035] As shown in some embodiments, Figure 4 and Figure 5 Further, the upper turnover hinge base (211) is a convex box structure installed on the side of the upright column (125) of the upper lifting frame (12), and the lower turnover hinge base (213) is a concave symmetrical box structure installed on the side of the front upright column (116) of the lower lifting frame (11). The upper turnover hinge base (211) and the lower turnover hinge base (213) are connected by concave-convex matching and a hinge structure.

[0036] Further, the hinge structure is a turnover pin shaft (212) passing through the upper turnover hinge base (211) and the lower turnover hinge base (213) to form a rotating connection pair. Preferably, the turnover pin shaft (212) is made of high-strength steel material, which mainly bears the load transmitted by the upper lifting frame (12) during turnover of the lifting frame assembly (1).

[0037] As shown in some embodiments, Figure 1 In some embodiments, the upper lifting frame (12) and the lower lifting frame (11) each comprise a frame structure arranged on the side away from the turnover direction; the frame structure of the upper lifting frame (12) comprises a rear pull rod (121), and the frame structure of the lower lifting frame (11) comprises a lower crane connecting base (111).

[0038] Through this embodiment, not only the overall structural strength and rigidity of the lifting frame assembly are strengthened, the weight distribution is optimized, and a reliable support foundation is provided for the overturning operation, but also the structural stability during the lifting operation is maintained. During the overturning process, the frame structure is arranged on the side away from the overturning direction, providing a counterweight for the upper lifting frame to balance left and right, effectively balancing the overturning moment, significantly enhancing the dynamic stability of the overturning process, reducing the risk of shaking and overturning caused by the shift of the center of gravity, ensuring the safety and reliability of the overturning operation, and avoiding the complex design of additional counterweight devices, further improving the simplicity and economy of the system.

[0039] As shown in Figure 2 and Figure 3 , the lifting frame assembly (1) is the main structure of the lifting equipment, and the lower lifting frame (11) and the upper lifting frame (12) are the main force components of the crane, both of which are spatial truss structures. The lower lifting frame (11) is composed of two pieces of lower lifting frame vertical truss pieces symmetrical to the ship body longitudinal axis and a plurality of transverse connecting rods located between the two lower lifting frame vertical truss pieces. The upper lifting frame (12) is composed of two pieces of upper lifting frame vertical truss pieces symmetrical to the ship body longitudinal axis and a plurality of transverse connecting rods located between the two upper lifting frame vertical truss pieces.

[0040] As shown in Figure 2 , the lower lifting frame vertical truss piece includes a front upright column (116), a rear pull rod (113), a lower crane connecting seat (111), an inclined strut (112), and connecting rods A (114), B, and C (115), all of which are box-shaped cross sections. The lower crane connecting seat (111) is arranged at the top end of the rear pull rod (113), the inclined strut (112) is connected to the rear pull rod (113) by a pin shaft, the connecting rod A (114) is inclinedly arranged between the rear pull rod (113) and the front upright column (116), the connecting rod B is horizontally arranged between the rear pull rod (113) and the front upright column (116), the connecting rod C (115) is connected to the inclined strut (112) and the connecting rod B by pin shafts at both ends, and the upper end of the inclined strut (112) is provided with a connecting flange.

[0041] Among them, the connecting rod A (114), the connecting rod B, and the front upright column (116), and the inclined strut (112), the connecting rod B, and the connecting rod C (115) respectively form a stable triangular force-bearing frame structure, enhancing the rigidity and structural stability of the overall device, effectively resisting loads in all directions, suppressing deformation and vibration, and thus ensuring the accuracy and reliability of the equipment during operation.

[0042] As shown in Figure 3As shown, the upper crane stand vertical truss piece includes a rear pull rod (121), an extension mechanism (122), a top load-bearing truss (124), a stand column (125), an inclined strut A' (126), a connecting rod A' (127), and a connecting rod B' (128), all of which are box-shaped sections. The stand column (125) is Y-shaped, with its upper end fixedly connected to the top load-bearing truss (124), and its lower end provided with an upper connecting seat (221), an upper turnover hinge seat (211), and a connecting flange. The rear pull rod (121) is rotatably connected to the top load-bearing truss (124) via a rotating shaft (123). One end of the inclined strut A' (126) is fixed to the stand column (125), and the other end is provided with a connecting flange for fixedly connecting with the inclined strut (112) of the lower crane stand (11) when the lower crane stand (11) is in an upright state. The inclined strut B' is arranged between the top load-bearing truss (124) and the stand column (125). The connecting rod A' (127) is hingedly connected to the inclined strut A' (126) and the stand column (125) at both ends, and the connecting rod B' (128) is hingedly connected to the inclined strut A' (126) and the inclined strut B' at both ends. The extension mechanism (122) is hingedly connected to the rear pull rod (121) and the inclined strut A' (126) at both ends, and the rear pull rod (121) can rotate about the rotating shaft (123) under the drive of the extension mechanism (122). Preferably, the extension mechanism (122) is an oil cylinder extension mechanism.

[0043] The inclined strut A' (126), the connecting rod A' (127), and the stand column (125) form a stable triangular force-bearing frame structure, which enhances the rigidity and structural stability of the overall device, effectively resists loads in all directions, suppresses deformation and vibration, and thus ensures the accuracy and reliability of the device during operation.

[0044] The crane is in an upright state during normal operation and navigation, at which time the upper crane stand (12) and the lower crane stand (11) are connected through the front stand column flange, the inclined strut flange, and the rear pre-tensioning device (3). When encountering a height-limited navigation condition, the upper crane stand (12) needs to be laid down around the turnover assembly (2) and supported by the bow bracket (4). After the upper crane stand (12) is laid down and supported by the bow bracket (4), the extension mechanism (122) is controlled to rotate the rear pull rod (121) of the upper crane stand (11) about the rotating shaft (123) to the folded state, further reducing the height of the laid-down overall machine and improving the navigation performance. The height of the crane in the laid-down state is only 50% of the height in the upright state.

[0045] As Figure 1As shown, in some embodiments, it further comprises a rear pre-tensioning device (3) for detachably connecting the rear pull rod (121) and the lower crane connecting seat (111).

[0046] Through this embodiment, quick and reliable fixing or disconnection can be achieved during the process of lodging or resetting, avoiding the cumbersome steps of traditional bolt fixing, significantly simplifying the operation process, improving the practicability and navigation efficiency of the crane, and providing higher flexibility for field application.

[0047] As shown in Figure 6 and Figure 7 The rear pre-tensioning device (3) comprises a connecting pin shaft (31), a screw rod assembly (32), a through-hole jack mechanism (33), an upper tensioning seat (34) and a lower tensioning seat (35). The upper tensioning seat (34) is arranged on the side of the rear pull rod (121) of the upper crane frame (12), the lower tensioning seat (35) is arranged on the top of the lower crane connecting seat (111) of the lower crane frame (11), the through-hole jack mechanism (33) is arranged on the upper tensioning seat (34), the screw rod assembly (32) passes through the through-hole jack mechanism (33), the upper tensioning seat (34) and the lower tensioning seat (35) in sequence, the lower crane connecting seat (111) is provided with a round hole for the connecting pin shaft (31) to pass through, and the rear pull rod (121) of the upper crane frame (12) is provided with a waist round hole for the connecting pin shaft (31) to pass through.

[0048] Further, the upper tensioning seat (34) is composed of two parallel vertical tensioning plates and internal partitions connecting the two tensioning plates. The internal flat partitions are provided with concentric holes (with a diameter larger than the diameter of the screw rod) through which the screw rod assembly (32) can pass. The lower tensioning seat (35) is composed of two parallel tensioning plates and side plates and upper and lower cover plates, forming a box structure. The upper and lower cover plates are provided with concentric holes (with a diameter larger than the diameter of the screw rod) through which the screw rod assembly (32) can pass.

[0049] The assembly steps of the rear pre-tensioning device (3) are as follows: the upper tensioning seat (34) is welded on the side of the rear pull rod (121), the lower tensioning seat (35) is welded on the top of the lower crane connecting seat (111), the through-hole jack mechanism (33) is placed on the top surface of the transverse partition plate of the upper tensioning seat (34), the screw rod assembly (32) passes through the through-hole jack mechanism (33), the upper tensioning seat (34) and the lower tensioning seat (35) in sequence, and the locking nut connector is connected at the top surface of the through-hole jack mechanism (33) and the lower cover plate of the lower tensioning seat (35).

[0050] By adjusting the through-hole jack mechanism (33), a gap is generated between the connecting pin shaft (31) and the waist round hole at the lower end of the rear pull rod (121), facilitating the disassembly and assembly of the connecting pin shaft (31). After the connecting pin shaft (31) is installed, the through-hole jack mechanism (33) is unloaded, and the self-weight of the upper lifting frame (12) can make the connecting pin shaft (31) tightly fit with the lower semicircular surface of the waist round hole, thereby meeting the structural stress requirement.

[0051] When the crane is in the upright state, the height of the crane will slowly increase when the through-hole jack mechanism (33) is working. Since the screw rod assembly (32) is in the locked state, the rear pull rod (121) and the upper tension seat (34) are forced to move along the length direction of the waist round hole at the lower end of the rear pull rod (121), so that a gap is generated between the connecting pin shaft (31) and the waist round hole, facilitating the disassembly or installation of the connecting pin shaft (31), and thereby completing the lodging work.

[0052] When switching from the lodging state to the upright state and entering the working state, the through-hole jack mechanism (33) is unloaded, and the height of the crane will slowly decrease. Under the self-weight of the upper lifting frame (12), the rear pull rod (121) and the upper tension seat (34) move along the length direction of the waist round hole of the rear pull rod (121), and finally the connecting pin shaft (31) tightly fits with the lower semicircular surface of the waist round hole of the rear pull rod (121), thereby ensuring the structural stress requirement of the crane in the working state.

[0053] In a second aspect, a lodging method of a center lifting ship crane is provided, including the following steps: The upper lifting frame (12) of the lifting frame assembly (1) is driven to rotate relative to the lower lifting frame (11) by the driving mechanism (22), so that the upper lifting frame (12) is flipped by a set angle a from the upright state, wherein the set angle a is a critical value at which the upper lifting frame (12) can continue to flip relative to the lower lifting frame (11) under the self-weight thereof; The driving force of the driving mechanism (22) is unloaded, and the position of the upper lifting frame (12) after being flipped by the set angle a is suspended and maintained by the auxiliary floating crane; The suspension force of the auxiliary floating crane is controlled, so that the upper lifting frame (12) is flipped to the lodging state under the combined action of the self-weight and the suspension force.

[0054] In some embodiments, before the step of driving the upper lifting frame (12) of the lifting frame assembly (1) to rotate relative to the lower lifting frame (11) by the driving mechanism (22), the mechanical connection between the lower lifting frame (11) and the upper lifting frame (12) of the lifting frame assembly (1) is released.

[0055] In some embodiments, the method further comprises the step of restoring the upper crane (12) from the laid state to the upright state. The upper crane (12) is inverted by the auxiliary floating crane until the upper crane (12) is inverted to a set angle a from the upright state. The driving force of the driving mechanism (22) is loaded, the suspension force of the auxiliary floating crane is unloaded, and the upper crane (12) is driven to invert to the upright state by the driving mechanism (22).

[0056] In some embodiments, the method further comprises restoring the mechanical connection between the lower crane (11) and the upper crane (12) of the crane assembly (1).

[0057] The working process of the embodiment of the application is as follows: The upper crane (12) is switched from the upright state to the laid state: first, the front column flange and the inclined strut flange connection between the lower crane (11) and the upper crane (12) and the connecting pin shaft (31) of the rear pre-tensioning device (3) are removed, the upper crane (12) is inverted around the inversion assembly (2) by a set angle a as the telescopic mechanism (222) slowly extends, then the telescopic mechanism (222) unloads and suspends the upper crane (12) by the auxiliary floating crane, at the same time, the connecting pin shaft between the telescopic mechanism (222) and the lower connecting seat (223) is removed, as the hook of the auxiliary floating crane descends, the upper crane (12) continues to invert and lay under its own weight and is carried by the bow bracket (4). Finally, the rear pull rod (121) of the upper crane (12) rotates around the rotating shaft (123) as the telescopic mechanism (122) slowly shortens, further reducing the overall height after laying and improving the navigation performance.

[0058] As shown in FIG. 4, the upper crane (12) is inverted by the auxiliary floating crane until the upper crane (12) is inverted to a set angle a from the upright state. Figure 8 As shown in FIG. 5, the upper crane (12) is in a state of being laid and carried by the bow bracket (4) after the laying is completed, which is used for the crane to pass through a bridge with a limited height requirement.

[0059] The upper crane (12) is restored from the laid state to the upright state: the upper crane (12) is lifted by the auxiliary floating crane and inverted around the inversion assembly (2) until the upper crane (12) is inverted to a set angle a from the upright state. In order to avoid the wave load causing the auxiliary floating crane to be unable to smoothly lift the upper crane, the connecting pin shaft between the telescopic mechanism (222) and the lower connecting seat (223) is installed at this time, the upper crane (12) is transferred from being carried by the floating crane to being carried by the telescopic mechanism (222) and continues to invert to the upright state. Finally, the connecting flange bolt and the connecting pin shaft (31) of the rear pre-tensioning device (3) are installed to complete the work from laying to upright.

[0060] In summary, the present application successfully solves the core technical problem that the traditional center lifting ship crane cannot meet the bridge height limit requirement due to the over-high lifting frame in navigation and dispatch by the reversible lifting frame assembly and the matching lodging method. The core is that after the driving mechanism drives the lifting frame to turn to the critical angle a, the auxiliary floating crane is used to realize safe lodging and resetting, without disassembly, which can greatly reduce the navigation height, while maintaining the structural stability and shallow draft advantage in lifting operation. The present application significantly simplifies the operation process, reduces the energy consumption and manufacturing cost, effectively expands the application scenarios of the crane in the bridge navigation height limit area and shallow water engineering area, and provides an efficient, economical and safe lifting solution for offshore engineering and port construction.

[0061] In the description of the present application, it should be noted that the positions or position relationships indicated by the terms "upper", "lower" and the like are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of 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.

[0062] It should be noted that in the present application, relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0063] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the scope of the application is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A crane for a center lift vessel, which is capable of being tilted, characterized in that, Comprise: A crane frame assembly (1) comprising a lower crane frame (11) and an upper crane frame (12) which can be overturned relative to the lower crane frame (11); A driving mechanism (22) for driving the upper crane frame (12) to rotate relative to the lower crane frame (11) so that the upper crane frame (12) is overturned by a set angle α from the upright state; Wherein, the set angle α is the critical value that the upper crane frame (12) can continue to overturn relative to the lower crane frame (11) under its own weight.

2. The crane of claim 1, wherein, The driving mechanism (22) is arranged on the side of the crane frame assembly (1) away from the overturning direction.

3. The crane of claim 2, wherein, The driving mechanism (22) comprises: An upper connecting seat (221) arranged on the side of the upper crane frame (12) away from the overturning direction; A lower connecting seat (223) arranged on the side of the lower crane frame (11) away from the overturning direction; A telescopic mechanism (222) having two ends respectively hinged to the upper connecting seat (221) and the lower connecting seat (223).

4. The crane of claim 1, wherein, Further comprising: A rotating structure (21) which, together with the driving mechanism (22), constitutes a overturning assembly (2); The rotating structure (21) comprises: An upper overturning hinge seat (211) arranged on the side of the upper crane frame (12) facing the overturning direction; A lower overturning hinge seat (213) arranged on the side of the lower crane frame (11) facing the overturning direction; The upper overturning hinge seat (211) and the lower overturning hinge seat (213) constitute a rotating connection pair through a hinge structure.

5. The crane of claim 1, wherein, The upper crane frame (12) and the lower crane frame (11) each comprise a frame structure arranged on the side away from the overturning direction.

6. The crane of claim 5, wherein, Further comprising: A rear pre-tensioning device (3) for detachably connecting the upper crane frame (12) and the lower crane frame (11).

7. A method of lodging a crane for a center- lift ship that can be lodged, characterized by, Comprise the following steps: Drive the upper crane frame (12) of the crane frame assembly (1) to rotate relative to the lower crane frame (11) by the driving mechanism (22) so that the upper crane frame (12) is overturned by a set angle α from the upright state, wherein the set angle α is the critical value that the upper crane frame (12) can continue to overturn relative to the lower crane frame (11) under its own weight; Unload the driving force of the driving mechanism (22), and suspend and maintain the position of the upper crane frame (12) after being overturned by the set angle α by means of an auxiliary floating crane; Control the suspension force of the auxiliary floating crane so that the upper crane frame (12) is overturned to the prostrate state under the combined action of its own weight and the suspension force.

8. The method of lodging according to claim 7, characterised in that, Before the step of driving the upper crane frame (12) of the crane frame assembly (1) to rotate relative to the lower crane frame (11) by the driving mechanism (22), further comprising: Release the mechanical connection between the lower crane frame (11) and the upper crane frame (12) of the crane frame assembly (1).

9. The method of lodging according to claim 7 or 8, characterized in that, Further comprising the step of restoring the upper crane frame (12) from the prostrate state to the upright state: Overturn the upper crane frame (12) by the auxiliary floating crane until the upper crane frame (12) is overturned by a set angle α from the upright state; The driving force of the driving mechanism (22) is loaded, and the suspension force of the auxiliary floating crane is unloaded, and the upper crane frame (12) is driven to overturn to a vertical state by the driving mechanism (22).

10. The method of lodging according to claim 9, characterised in that, Also comprising: The mechanical connection between the lower crane frame (11) and the upper crane frame (12) of the crane assembly (1) is restored.

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