Offshore heavy-load low-headroom luffing crane

Abstract

The present invention discloses a heavy-load, low-headroom variable-luffing crane at sea. The crane is arranged on a ship deck and comprises a single A-shaped frame assembly arranged on the stern deck and two inverted L-shaped boom assemblies arranged on the bow deck in a transverse direction to the ship, wherein the two inverted L-shaped boom assemblies are symmetrically arranged about the center line of the deck. The single A-shaped frame assembly + the double inverted L-shaped boom assemblies in the present invention can reserve a large amount of deck space for later construction, thereby greatly improving the space utilization rate of the crane deck. At the same time, the inverted L-shaped boom assembly is an asymmetric space truss structure, which reduces its own weight while increasing the effective hoisting space between the two booms during double-arm hoisting.

Description

Technical Field

[0001] The present invention relates to the field of marine cranes, and in particular to a heavy-load low-headroom luffing crane at sea. Background Art

[0002] With the increasing development of cross-sea bridge construction, the demand for large-scale lifting equipment is growing, and crane structures must continue to innovate to accommodate complex lifting conditions. A cross-sea bridge construction project in a coastal region of my country requires a crane vessel capable of handling heavy loads within a height-restricted area. Using a conventional crane vessel would require significantly longer booms and a wider operating range, which would be cost- and safety-critical.

[0003] In addition, the deck space utilization rate of the crane vessel used for offshore construction operations is very important. The A-frame and the boom are the two main load-bearing structural components in the ship crane. In existing ship cranes of the same type at home and abroad, a single A-frame with a single boom or a double A-frame with a double boom is generally used, and the deck space utilization rate is not high. The present invention adopts a single A-frame with a double boom, which effectively improves the deck space utilization rate and reduces the number of interfaces between the ship deck and the equipment. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of existing equipment and provide a heavy-load low-headroom variable-luffing crane at sea. The crane is a marine crane with a single-H-shaped frame and double L-shaped boom structure. The boom assembly of the crane has a small overall size and can meet the lifting height and lifting weight requirements with a smaller operating radius in a restricted low-headroom area. The structure has the characteristics of excellent safety performance and good economic benefits.

[0005] To achieve the above objectives, the present invention provides a heavy-load, low-headroom, luffing crane for offshore use. The crane is arranged on a ship deck and comprises a single-arm frame assembly disposed on the stern deck and two inverted L-shaped boom assemblies disposed on the bow deck in a transverse (widthwise) arrangement. The two inverted L-shaped boom assemblies are symmetrically arranged about the deck centerline.

[0006] The single herringbone assembly includes two herringbone-shaped girders symmetrically arranged about the centerline of the ship deck, the top ends of the two herringbone-shaped girders being connected to a main beam, the main beam being a box beam structure, and a plurality of variable-length fixed pulley groups being arranged on the top surface of the main beam;

[0007] A plurality of guide pulleys (for guiding lifting and luffing wire ropes) are arranged on the front side of the main beam;

[0008] The inverted L-shaped boom assembly includes an outer inverted L-shaped truss piece and an inner inverted L-shaped truss piece;

[0009] The outer inverted L-shaped trusses and the inner inverted L-shaped trusses are arranged inclined toward the longitudinal center plane of the lifting pulley block (the lifting pulley block includes a movable pulley block, a fixed pulley block and a lifting hook), and the inclination angle of the inner inverted L-shaped trusses close to the midship side is greater than the inclination angle of the outer inverted L-shaped trusses close to the side of the ship;

[0010] The main longitudinal beams at the tops of the outer inverted L-shaped trusses and the inner inverted L-shaped trusses are connected by three cross beams, namely, a front cross beam, a middle cross beam and a rear cross beam.

[0011] The front side surfaces of the front crossbeam and the middle crossbeam are both provided with lifting pulley sets;

[0012] A plurality of guide pulleys are provided on the rear side surface of the middle cross beam; luffing movable pulley groups are symmetrically arranged at both ends of the rear cross beam; a plurality of guide pulleys are provided at both ends of the rear cross beam; the crane also includes a plurality of sets of luffing winch mechanisms and a plurality of sets of lifting winch mechanisms arranged on the ship deck.

[0013] The above-mentioned luffing winch mechanism and hoisting winch mechanism are used in conjunction with the luffing movable pulley group, the guide pulley and the luffing fixed pulley group, which belong to the existing technology; wherein,

[0014] The steel wire rope in the drum of the luffing winch mechanism (the luffing winch mechanism is a single-rope design) enters the luffing movable pulley group of the corresponding inverted L-shaped boom assembly rear beam through the guide pulley on the front side of the main beam of the single-frame assembly, and then is wound and connected with the luffing fixed pulley group on the top surface of the main beam according to the designed ratio;

[0015] The steel wire rope in the drum of the lifting winch mechanism (the lifting winch mechanism is a single-rope design) enters the movable pulley group of the corresponding lifting pulley group through the guide pulley on the front side of the main beam of the single-frame assembly and the guide pulley on the inverted L-shaped boom assembly, and then is wound and connected with the fixed pulley group of the lifting pulley group according to the designed ratio.

[0016] Furthermore, the angle α formed by the inverted L-shaped boom assembly (the inverted L-shaped boom assembly can move in a variable-length manner under the drive of the variable-length winch) and the deck is 70° to 90°;

[0017] The included angle β between the inner inverted L-shaped truss and the longitudinal center plane of the lifting pulley set is 8 to 10 degrees, and the included angle γ between the outer inverted L-shaped truss and the longitudinal center plane of the lifting pulley set is 2 to 4 degrees.

[0018] Furthermore, the outer inverted L-shaped truss piece and the inner inverted L-shaped truss piece have the same structure, including a boom rear pull rod and a boom front support rod, and the boom front support rod is bent in the middle, and the bending angle is 150 to 170 degrees;

[0019] The boom rear tie rod is perpendicular to the main longitudinal beam, and the variable-length movable pulley set is located at a right-angle intersection; the intersection of the boom front support rod and the main longitudinal beam is located at the midpoint of the bottom surface of the main longitudinal beam;

[0020] An oblique connecting rod is provided at the middle part of the front support rod of the boom and the top end of the rear pull rod of the boom; the middle part of the rear pull rod of the boom and the middle part of the front support rod of the boom are connected by a longitudinal connecting rod, and the middle parts of the outer inverted L-shaped truss and the inner inverted L-shaped truss are connected by two middle cross beams; the lower parts of the outer inverted L-shaped truss and the inner inverted L-shaped truss are connected by a single bottom cross beam.

[0021] Furthermore, the included angle between the boom rear pull rod and the boom front support rod is 16-18 degrees.

[0022] Furthermore, the outer inverted L-shaped truss piece of the inverted L-shaped boom assembly is connected to the boom hinge seat through a pin shaft; the inner inverted L-shaped truss pieces of the two inverted L-shaped boom assemblies are both connected to the boom connecting seat.

[0023] Furthermore, the herringbone truss is composed of a vertical rear rod and an inclined front rod, and the angle between the rear rod and the top of the front rod is 30° to 40°;

[0024] There are four connecting rods horizontally set in the middle of the two herringbone trusses, and the four connecting rods are connected end to end to form a rectangular fixed frame; four oblique rods are set in the plane of the two front struts to form a herringbone support frame; it is divided into a lower herringbone support frame and an upper herringbone support frame.

[0025] The two ends of the bottom of the lower herringbone support frame are fixed to the bottom of the front support rod, and the top of the lower herringbone support frame is arranged in the middle of the connecting rod between the front support rods;

[0026] The two ends of the bottom of the upper herringbone support frame are fixed to the connection between the front support rod and the connecting rod; and the top of the upper herringbone support frame is arranged in the center of the main crossbeam.

[0027] Furthermore, the variable-length fixed pulley groups on the top surface of the main beam are correspondingly arranged on both sides of the main beam.

[0028] Beneficial effects of the present invention:

[0029] 1. In terms of economy and ship deck space utilization, the present invention adopts a single A-frame assembly + double inverted L-shaped boom assembly. Compared with the traditional single A-frame + single boom, the present invention greatly improves the space utilization of the crane ship deck, while saving the production cost of the A-frame, and has good economy.

[0030] 2. In terms of structural design, the present invention adopts an asymmetric boom structure of an inverted L-shaped boom assembly. The boom uses the top main longitudinal beam cantilever structure as the direct force-bearing component during lifting, and the cantilever structure is supported by the boom rear pull rod and the boom front support rod, which effectively increases the lifting height of heavy objects and reduces the operating radius.

[0031] 3. In terms of safety in use, since the inverted L-shaped boom assembly has a smaller operating radius, the luffing force is smaller, which effectively reduces the cost of the luffing mechanism and enhances operational safety.

[0032] To sum up: the single A-shaped frame assembly + double inverted L-shaped boom assembly in the present invention can reserve a large amount of deck space for later construction, greatly improving the space utilization rate of the crane ship deck; at the same time, the inverted L-shaped boom assembly is an asymmetric space truss structure, which reduces its own weight while increasing the effective lifting space between the two booms during double-arm lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the main view of the offshore heavy-load low-headroom luffing crane;

[0034] Figure 2 This is a top view of a heavy-load, low-headroom luffing crane at sea;

[0035] Figure 3 This is a longitudinal elevation view of two inverted L-shaped boom assemblies;

[0036] Figure 4 It is a three-dimensional diagram of the inverted L-shaped boom assembly;

[0037] Figure 5 It is a three-dimensional diagram of a single cross component;

[0038] In the figure, the herringbone girder 1, the rear tie rod 1.1, the front strut 1.2, the connecting rod 1.3, the main crossbeam 2, the luffing fixed pulley block 3, the lower herringbone support frame 4, the upper herringbone support frame 5, the guide pulley 6, the outer inverted L-shaped girder 7, the inner inverted L-shaped girder 8, the main longitudinal beam 9, the front crossbeam 10, the middle crossbeam 11, the rear crossbeam 12, the lifting pulley block 13, the fixed pulley block 13.1, the movable pulley block 13.2, the luffing movable pulley block 14, the luffing winch mechanism 15, the lifting winch mechanism 16, the boom rear tie rod 17, the boom front strut 18, the diagonal connecting rod 19, the longitudinal connecting rod 20, the middle crossbeam 21, the bottom crossbeam 22, the boom capstan 23, the boom connecting seat 24, the stern 25, the bow 26, and the wire rope 27. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to specific embodiments so that those skilled in the art can understand.

[0040] like Figures 1 to 5The heavy-load, low-headroom, luffing crane shown is arranged on a ship deck and includes a single-arm frame assembly on the stern deck and two inverted L-shaped boom assemblies arranged transversely (widthwise) on the bow deck. The two inverted L-shaped boom assemblies are symmetrically arranged about the deck centerline.

[0041] The single herringbone frame assembly includes two herringbone trusses 1 symmetrically arranged with respect to the center line of the ship deck. The top ends of the two herringbone trusses 1 are connected to the main beam 2.

[0042] The herringbone truss 1 is composed of a vertical rear tie rod 1.1 and an inclined front strut 1.2, and the angle between the rear tie rod 1.1 and the top of the front strut 1.2 is 35 degrees; four connecting rods 1.3 are horizontally arranged in the middle of the two herringbone trusses 1, and the four connecting rods 1.3 are connected end to end to form a rectangular fixed frame; four oblique rods are arranged in the plane of the two front struts 1.2 to form two herringbone support frames; divided into a lower herringbone support frame 4 and an upper herringbone support frame 5, the bottom ends of the lower herringbone support frame 4 are fixed to the bottom of the front strut 1.2, and the top of the lower herringbone support frame 4 is arranged in the middle of the connecting rod between the front struts 1.2; the bottom ends of the upper herringbone support frame 5 are fixed to the connection between the front strut 1.2 and the connecting rod; and the top of the upper herringbone support frame 5 is arranged in the center of the main beam 2;

[0043] The main crossbeam 2 is a box beam structure. Four sets of luffing fixed pulleys 3 are arranged on the top surface of the main crossbeam 2. The four sets of luffing fixed pulleys 3 are arranged on both sides of the main crossbeam 2. Eight guide pulleys 6 are arranged on the front side of the main crossbeam 2 (for guiding the lifting and luffing wire ropes).

[0044] The angle α formed between the inverted L-shaped boom assembly and the deck is 70° to 90°; the inverted L-shaped boom assembly includes an outer inverted L-shaped truss piece 7 and an inner inverted L-shaped truss piece 8; the outer inverted L-shaped truss piece 7 and the inner inverted L-shaped truss piece 8 are both plane trusses.

[0045] The outer inverted L-shaped truss piece 7 of the inverted L-shaped boom assembly is connected to the boom capstan seat 23 via a pin; the inner inverted L-shaped truss pieces 8 of the two inverted L-shaped boom assemblies are both connected to the boom connecting seat 24; the angle β between the inner inverted L-shaped truss piece 8 and the longitudinal center plane of the lifting pulley block is 9°, and the angle γ between the outer inverted L-shaped truss piece 7 and the longitudinal center plane of the lifting pulley block is 3°;

[0046] The outer inverted L-shaped truss piece 7 and the inner inverted L-shaped truss piece 8 have the same structure, both including a boom rear tie rod 17 and a boom front support rod 18, the boom rear tie rod 17 and the boom front support rod 18 have an included angle of 17 degrees; the boom front support rod 18 is bent in the middle, and the bending angle is 150-170 degrees;

[0047] The boom rear pull rod 17 is perpendicular to the main longitudinal beam 9, and the variable amplitude movable pulley set 14 is located at the right-angle intersection; the intersection of the boom front support rod 18 and the main longitudinal beam 9 is located at the midpoint of the bottom surface of the main longitudinal beam 9; a diagonal connecting rod 19 is provided at the middle of the boom front support rod 18 and the top of the boom rear pull rod 17; the middle of the boom rear pull rod 17 and the middle of the boom front support rod 18 are connected by a longitudinal connecting rod 20, and the middle of the outer inverted L-shaped truss 7 and the inner inverted L-shaped truss 8 are connected by two middle cross beams 21; the lower parts of the outer inverted L-shaped truss 7 and the inner inverted L-shaped truss 8 are connected by a single bottom cross beam 22.

[0048] The main longitudinal beam 9 at the top of the outer inverted L-shaped truss 7 and the inner inverted L-shaped truss 8 is connected by three crossbeams: the front crossbeam 10, the middle crossbeam 11, and the rear crossbeam 12. The front side surfaces of the front crossbeam 10 and the middle crossbeam 11 are both provided with a lifting pulley block 13; the rear side surface of the middle crossbeam 11 is provided with a plurality of guide pulleys 6; the two ends of the rear crossbeam 12 are symmetrically provided with a variable amplitude movable pulley block 14; and the two ends of the rear crossbeam 12 are provided with a plurality of guide pulleys 6;

[0049] The crane further comprises two sets of luffing winches 15 and two sets of hoisting winches 16 which are arranged on the deck of the ship.

[0050] The above-mentioned luffing winch mechanism 15, the hoisting winch mechanism, the luffing movable pulley group 14, the guide pulley and the luffing fixed pulley group 3 are used in conjunction with the prior art; wherein,

[0051] The steel wire rope in the drum of the luffing winch mechanism 15 (the luffing winch mechanism is a single-rope design) passes through the guide pulley 6 on the front side of the main crossbeam 2 of the single-H-shaped frame assembly and enters the luffing movable pulley block 14 of the corresponding inverted L-shaped boom assembly rear crossbeam 12, and then is wound and connected with the luffing fixed pulley block 3 on the top surface of the main crossbeam 2 according to the designed ratio;

[0052] The steel wire rope in the drum of the hoisting winch mechanism 16 (the hoisting winch mechanism 16 is a single-rope design) enters the movable pulley group 13.2 of the corresponding hoisting pulley group 13 through the guide pulley 6 on the front side of the main crossbeam 2 of the single-frame assembly and the guide pulley 6 on the inverted L-shaped boom assembly, and then is wound and connected with the fixed pulley group 13.1 of the hoisting fixed pulley group 13 according to the designed ratio.

[0053] Although the above embodiments have been described in detail, they are only a part of the embodiments of the present invention, not all of them. People can also obtain other embodiments based on this embodiment without inventiveness, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A heavy-load, low-headroom, luffing crane for use at sea, arranged on a ship deck, characterized in that: It includes a single herringbone assembly arranged on the stern deck and two inverted L-shaped boom assemblies arranged on the bow deck in a transverse direction of the ship, and the two inverted L-shaped boom assemblies are symmetrically arranged about the center line of the deck; The single herringbone assembly comprises two herringbone-shaped girders (1) symmetrically arranged about the center line of the ship deck, the top ends of the two herringbone-shaped girders (1) being connected to a main beam (2), the main beam (2) being a box beam structure, a plurality of variable-length fixed pulley groups (3) being arranged on the top surface of the main beam (2); and a plurality of guide pulleys (6) being arranged on the front side surface of the main beam (2); The inverted L-shaped boom assembly comprises an outer inverted L-shaped truss (7) and an inner inverted L-shaped truss (8); the outer inverted L-shaped truss (7) and the inner inverted L-shaped truss (8) are arranged tilted toward the longitudinal center plane where the lifting pulley block is located, and the inclination angle of the inner inverted L-shaped truss (8) close to the midship side is greater than the inclination angle of the outer inverted L-shaped truss (7) close to the side of the ship; The main longitudinal beam (9) at the top of the outer inverted L-shaped truss (7) and the inner inverted L-shaped truss (8) is connected by three cross beams, namely, a front cross beam (10), a middle cross beam (11) and a rear cross beam (12); the front side surfaces of the front cross beam (10) and the middle cross beam (11) are both provided with a lifting pulley group (13); the rear side surface of the middle cross beam (11) is provided with a plurality of guide pulleys (6); the two ends of the rear cross beam (12) are symmetrically provided with a variable amplitude movable pulley group (14); and the two ends of the rear cross beam (12) are provided with a plurality of guide pulleys (6); The crane further comprises a plurality of sets of luffing winch mechanisms (15) and a plurality of sets of lifting winch mechanisms (16) arranged on the ship deck; The four groups of variable-length fixed pulley sets (3) on the top surface of the main crossbeam (2) are correspondingly arranged on both sides of the main crossbeam (2), and one group of variable-length fixed pulley sets (3) and one group of variable-length movable pulley sets (14) are correspondingly arranged.

2. The offshore heavy-load low-headroom luffing crane according to claim 1, characterized in that: The angle α formed between the inverted L-shaped boom assembly and the deck is 70° to 90°; The included angle β between the inner inverted L-shaped truss (8) and the longitudinal center plane of the lifting pulley group is 8° to 10°, and the included angle γ between the outer inverted L-shaped truss (7) and the longitudinal center plane of the lifting pulley group (13) is 2° to 4°.

3. The offshore heavy-load low-headroom luffing crane according to claim 1 or 2, characterized in that: The outer inverted L-shaped truss piece (7) and the inner inverted L-shaped truss piece (8) have the same structure, both comprising a boom rear pull rod (17) and a boom front support rod (18), wherein the boom front support rod (18) is bent in the middle, and the bending angle thereof is 150° to 170°; The boom rear pull rod (17) is perpendicular to the main longitudinal beam (9), and the variable amplitude movable pulley group (14) is located at a right-angle intersection; the intersection of the boom front support rod (18) and the main longitudinal beam (9) is located at the midpoint of the bottom surface of the main longitudinal beam (9); an oblique connecting rod (19) is provided at the middle of the boom front support rod (18) and the top of the boom rear pull rod (17); the middle of the boom rear pull rod (17) and the middle of the boom front support rod (18) are connected by a longitudinal connecting rod (20), and the middle of the outer inverted L-shaped truss (7) and the inner inverted L-shaped truss (8) are connected by two middle cross beams (21); the lower parts of the outer inverted L-shaped truss (7) and the inner inverted L-shaped truss (8) are connected by a single bottom cross beam (22).

4. The offshore heavy-load low-headroom luffing crane according to claim 3, characterized in that: The included angle between the boom rear pull rod (17) and the boom front support rod (18) is 16° to 18°.

5. The offshore heavy-load low-headroom luffing crane according to claim 1 or 2, characterized in that: The outer inverted L-shaped truss piece (7) of the inverted L-shaped boom assembly is connected to the boom hinge seat (23) via a pin shaft; the inner inverted L-shaped truss pieces (8) of the two inverted L-shaped boom assemblies are both connected to the boom connection seat (24).

6. The offshore heavy-load low-headroom luffing crane according to claim 1, characterized in that: The herringbone truss (1) is composed of a vertical rear tie rod (1.1) and an inclined front support rod (1.2), and the angle between the tops of the rear tie rod (1.1) and the front support rod (1.2) is 30° to 40°; Four connecting rods (1.3) are horizontally arranged in the middle of the two herringbone trusses (1), and the four connecting rods (1.3) are connected end to end to form a rectangular fixed frame; four oblique rods are arranged in the plane of the two front support rods (1.2) to form (2) a herringbone support frame; the herringbone support frame is divided into a lower herringbone support frame (4) and an upper herringbone support frame (5). The two ends of the bottom of the lower herringbone support frame (4) are fixed to the bottom of the front support rod (1.2), and the top of the lower herringbone support frame (4) is arranged in the middle of the connecting rod between the front support rods (1.2); The two ends of the bottom of the upper herringbone support frame (5) are fixed to the connection between the front support rod (1.2) and the connecting rod (1.3); and the top of the upper herringbone support frame (5) is arranged in the center of the main crossbeam (2).

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