A ship crane with anti-rolling function and a crane boom assembly

Abstract

The present invention provides a ship crane and a crane boom assembly capable of reducing roll, relating to the technical field of ship cranes, including a terminal rotating arm. A damping roll reducer is arranged below the end of the terminal rotating arm, an anti-sway hook is arranged directly below the damping roll reducer, a hook driving assembly for driving the anti-sway hook to lift and lower is arranged inside the terminal rotating arm, and roll reducer driving assemblies for driving the damping roll reducer to lift and lower are arranged at positions near the front ends on both side walls of the terminal rotating arm. The present invention uses a segmented lifting method to cope with different stages of cargo lifting. In the initial stage of cargo lifting, single-rope lifting is used to match the high motion inertia of the offshore cargo, and the flexible connection method is adopted to avoid tearing or deformation of the lifting point structure caused by lateral impact. After the cargo reaches the target height, the damping roll reducer drives the cargo to be further lifted. The anti-sway hook adopts a double-rope design, which significantly increases the lateral stiffness and meets the high-precision positioning requirements for cargo alignment.

Description

Technical Field

[0001] The present invention relates to the technical field of ship cranes, and particularly to a ship crane capable of reducing roll and a crane boom assembly. Background Art

[0002] As a core equipment for ship operations, ship cranes play a crucial role in key fields such as offshore cargo handling, equipment installation, and offshore rescue. In the scenario of offshore cargo handling, the crane lowers the hook to connect with the cargo, and then starts the lifting mechanism to overcome various complex factors and lift the cargo from the sea surface to the designated position on the deck. Among them, double-rope lifting is the mainstream mode of ships. It shares the weight of the cargo by two steel ropes. When lifting the cargo, the operator locates the cargo on the sea surface. After getting ready, the hook is used to hook the cargo, and then the lifting mechanism is started. The two steel ropes are used to lift the cargo synchronously. When approaching the deck, the speed is slowed down, and fine-tuning is carried out with the help of a camera to place the cargo smoothly at the designated position. Due to the stable structure formed by the two steel ropes, it can better resist external interference forces and reduce the risk of cargo swaying.

[0003] However, the double-rope system mainly relies on adjusting the tension of the ropes to suppress the sway of the cargo. This strategy overly focuses on the mechanical adjustment of the ropes themselves, but seriously ignores the sway impact of the cargo during the lifting process. Especially in the initial stage when the cargo is just lifted from the sea surface, the cargo will be strongly impacted by the sea water, and when the cargo suddenly leaves the sea surface, due to the instantaneous disappearance of buoyancy, there will be a large acceleration change, which makes the cargo have a strong motion inertia at this stage. This inertia causes the relative movement amplitude of the suspension point position of the cargo on the hook to be extremely large. In some extreme cases, the relative displacement can reach several meters. This not only greatly increases the instability during the cargo lifting process, easily leads to collisions between the cargo and the ship's structural components, causing damage to the cargo or local damage to the ship's structure, and may even cause the cargo to fall off the hook, resulting in serious safety accidents. And single-rope cranes have relatively large potential safety hazards when hoisting heavy objects on the sea surface due to the lack of relatively stable anti-rolling measures.

[0004] Based on the above viewpoints, those skilled in the art have proposed a ship crane capable of reducing roll and a crane boom assembly. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a ship crane and a crane boom assembly capable of reducing roll. The present invention uses a segmented lifting method to cope with different stages of cargo lifting. In the initial stage of cargo lifting, single-rope lifting is used to match the high movement inertia of the offshore cargo, and the flexible connection method is used to avoid tearing or deformation of the hoisting point structure caused by lateral impact. After the cargo reaches the target height, the damping roll reducer drives the cargo to be further lifted. The anti-sway hook adopts a double-rope design, which significantly increases the lateral stiffness and meets the high-precision positioning requirements for cargo alignment.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A ship crane and a crane boom assembly capable of reducing roll, including a terminal rotating arm. A damping roll reducer is provided below the end of the terminal rotating arm. An anti-sway hook is provided directly below the damping roll reducer. A hook driving assembly for driving the anti-sway hook to lift is provided inside the terminal rotating arm. Reducer driving assemblies for driving the damping roll reducer to lift are provided at positions near the front ends on both side walls of the terminal rotating arm.

[0007] The damping roll reducer includes a damper housing. A roll-reducing damper disc is connected in a limited sliding manner at the center inside the damper housing. A number of spring-connected wedge-shaped rods with springs are provided on the inner side wall of the damper housing. The inner side wall of the spring-connected wedge-shaped rod abuts against the outer wall of the sliding damper disc. A damping mechanism is provided at a position below the inner part of the damper housing and directly below each spring-connected wedge-shaped rod. The damping mechanism includes a damping cylinder fixed inside the damper housing. The damping cylinder stores a damping medium. The bottom of the damping cylinder is connected to a bottom plate through a spring. An outer guiding cylinder for limiting the bottom plate is fixedly connected to the bottom of the damper housing and outside the outer wall of the bottom plate. A telescopic rod is fixedly connected to the center of the upper side wall of the bottom plate. The top of the telescopic rod penetrates through the upper and lower side walls of the damping cylinder and is arranged below the spring-connected wedge-shaped rod. Wedge-shaped surfaces that cooperate with each other are provided on the side walls of the telescopic rod and the spring-connected wedge-shaped rod that are close to each other. A perforated plate is fixedly connected to the outer side wall of the telescopic rod arranged inside the damping cylinder.

[0008] Preferably, the anti-sway hook includes a hook mounting frame. A movable pulley is rotatably connected at the middle position inside the hook mounting frame. A bottom hook is fixedly connected to the bottom of the hook mounting frame. A hook driving steel cable is wound around the movable pulley. One end of the hook driving steel cable is fixed to the bottom of the outer side wall of the terminal rotating arm. The other end of the hook driving steel cable is wound around the hook driving assembly. The hook driving assembly includes a roller for winding the hook driving steel cable, a motor for driving the roller to rotate, and a guiding roller for guiding the hook driving steel cable. The lower half of the hook driving steel cable is arranged at the center of the roll-reducing damper disc.

[0009] Preferably, the anti-rolling damping disc includes a sliding damping disc. An electromagnet is connected to the center of the bottom of the sliding damping disc through a spring. At the outer position near the inner top of the hook mounting bracket, a plurality of suspension ropes are fixedly connected. The other ends of the plurality of suspension ropes are fixedly connected to a load balancing disc. A plurality of horn-shaped grooves are formed on the load balancing disc. Telescopic iron rods are installed on the lower inner wall of the hook mounting bracket and directly below each horn-shaped groove. The telescopic iron rods are used in cooperation with the electromagnet.

[0010] Preferably, a plurality of tension wheels are installed on the left and right sides of the upper side wall of the damper housing. A damper driving steel cable is wound around the plurality of tension wheels on the same side. One end of the damper driving steel cable is fixedly connected to the bottom of the end rotating arm. The other end of the damper driving steel cable is wound around the anti-rolling device driving assembly on the same side. The anti-rolling device driving assembly includes a roller for winding the damper driving steel cable, a motor for driving the roller to rotate, and a guide roller for guiding the damper driving steel cable.

[0011] Preferably, a tension adjusting mechanism is arranged on the front and rear sides of the plurality of tension wheels on the upper side wall of the damper housing. The tension adjusting mechanism includes two top slide rails fixed to the top of the damper housing. A tension pulley is slidably connected in each top slide rail through a spring. A tension adjusting support arm is pin-connected to the outer side walls of the two tension pulleys. The tension adjusting support arm is composed of two equal-length frame structures. The two frame structures are respectively pin-connected to the outer sides of the two tension pulleys, and the ends of the two frame structures close to each other are pin-connected.

[0012] Preferably, a steel cable protection mechanism is slidably connected to the bottom of the inner side wall of the damper housing through a ball rail. The steel cable protection mechanism includes a spring-bottomed chassis. A spring for supporting the spring-bottomed chassis is arranged between the spring-bottomed chassis and the bottom of the damper housing. Chassis pulling steel cables are respectively fixedly connected to the two side walls of the spring-bottomed chassis. The other ends of the two chassis pulling steel cables are respectively sleeved on the shafts at the centers of the tension adjusting support arms on the same side as them. An outer guide pulley for guiding the chassis pulling steel cables is also installed on the outer side wall of the damper housing.

[0013] Preferably, magnet pulling steel ropes are fixedly connected to the two sides of the upper side wall of the electromagnet. The other ends of the two magnet pulling steel ropes are sleeved on the shafts at the centers of the tension adjusting support arms on the same side as them. An inner guide pulley for guiding the magnet pulling steel ropes is also installed on the upper side wall of the damper housing.

[0014] Preferably, a second rotating arm is pin-connected to the rear side wall of the end rotating arm, a first rotating arm is pin-connected to the bottom of the second rotating arm, a crane base for driving the first rotating arm to rotate is installed at the bottom of the first rotating arm, a second rotating arm angle adjustment oil cylinder for driving the second rotating arm to rotate is pin-connected to the bottom of the front side wall of the first rotating arm, the movable end of the second rotating arm angle adjustment oil cylinder is pin-connected to the rear side position near the bottom of the second rotating arm, an end rotating arm angle adjustment oil cylinder for driving the end rotating arm to rotate is pin-connected to the bottom of the second rotating arm, and the movable end of the end rotating arm angle adjustment oil cylinder is pin-connected to the bottom of the end rotating arm.

[0015] The present invention has the following technical points and beneficial effects:

[0016] 1. The crane uses a segmented lifting method to cope with different stages of cargo hoisting. In the initial stage of cargo hoisting, single-rope hoisting is used to match the high movement inertia of the offshore cargo. Through the flexible connection method, the tearing or deformation of the lifting point structure caused by lateral impact is avoided. After the cargo reaches the target height, the damping anti-sway hook uses a double-rope design to significantly increase the lateral stiffness, meeting the high-precision positioning requirements for cargo alignment.

[0017] 2. When the hook driving steel cable is driven by the cargo to shake greatly, the hook driving steel cable will squeeze the sliding damping disc, and then press the telescopic rod to move downward. Then, the viscous force of the damping medium is used to do work to consume the mechanical energy of the perforated plate and convert it into heat energy, thereby realizing energy absorption, absorbing the energy generated by the shaking of the hook driving steel cable, and reducing the swing amplitude of the hook driving steel cable.

[0018] 3. When the telescopic rod is driven to move downward, under the pulling of the chassis pulling steel cable, the tension adjustment support arm drives the tension pulleys at both ends to move away from each other. At this time, the tension of the damper driving steel cable decreases, enabling the entire damping anti-sway device to also shake within a small range, avoiding excessive alternating stress on the hook driving steel cable due to the limit of the damping anti-sway device.

[0019] 4. During the process of using the damping anti-sway device to further lift the cargo, if the cargo shakes, the magnet pulling steel rope pulls the chassis pulling steel cable to rise, driving several bottom plates to rise by using the chassis pulling steel cable. At this time, the damping mechanism located inside the damper housing will act together. As the bottom plate rises, the perforated plate moves inside the damping cylinder, converting mechanical energy into heat energy, thereby absorbing the shaking generated by the cargo shaking and quickly reducing the shaking of the cargo. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the first structural schematic diagram of the present invention;

[0021] Figure 2Schematic diagram of the bottom structure of the present invention;

[0022] Figure 3 Schematic diagram of the second structure of the present invention;

[0023] Figure 4 Isometric sectional view of the present invention;

[0024] Figure 5 Is Figure 4 Enlarged schematic view of part A in

[0025] Figure 6 Schematic diagram of the cooperation between the damping anti-rolling device and the damper driving steel cable in the present invention;

[0026] Figure 7 Isometric sectional view of the cooperation between the damping anti-rolling device and the damper driving steel cable in the present invention;

[0027] Figure 8 Schematic diagram of the damping anti-rolling device and the damper driving steel cable hiding the damper housing in the present invention;

[0028] Figure 9 Schematic diagram of the cooperation between the anti-rolling damping disc, the damping mechanism and the spring-loaded wedge rod in the damping anti-rolling device of the present invention;

[0029] Figure 10 First schematic diagram of the cooperation between the tension adjustment mechanism, the steel cable protection mechanism and the anti-rolling damping disc in the damping anti-rolling device of the present invention;

[0030] Figure 11 Second schematic diagram of the cooperation between the tension adjustment mechanism, the steel cable protection mechanism and the anti-rolling damping disc in the damping anti-rolling device of the present invention;

[0031] Figure 12 Isometric sectional view of the damping mechanism in the present invention.

[0032] Wherein, 1, crane base; 2, first rotating arm; 3, second rotating arm angle adjustment oil cylinder; 4, second rotating arm; 5, end rotating arm angle adjustment oil cylinder; 6, end rotating arm; 7, damping anti-rolling device; 8, anti-sway hook; 9, hook driving assembly; 10, anti-rolling device driving assembly; 11, hook driving steel cable; 12, damper driving steel cable;

[0033] 71, damper housing; 72, anti-rolling damping disc; 73, tension pulley; 74, tension adjustment mechanism; 75, steel cable protection mechanism; 76, spring-loaded wedge rod; 77, damping mechanism; 78, outer guide pulley; 79, inner guide pulley;

[0034] 81, hook mounting bracket; 82, bottom hook; 83, movable pulley; 84, lifting rope; 85, load balance disc; 86, horn groove; 87, telescopic iron rod;

[0035] 721. Sliding damping disc; 722. Electromagnet; 723. Magnet pulling steel rope;

[0036] 741. Top slide rail; 742. Tension pulley; 743. Tension adjusting support arm;

[0037] 751. Spring belt chassis; 752. Chassis pulling steel cable;

[0038] 771. Outer guide cylinder; 772. Damping cylinder; 773. Telescopic rod; 774. Perforated plate; 775. Base plate. Specific implementation mode

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment 1, as Figure 1 shown, the embodiment of the present invention provides a ship crane and a crane boom assembly capable of reducing roll, including an end rotating arm 6. The rear side wall of the end rotating arm 6 is pin-connected with a second rotating arm 4. The bottom of the second rotating arm 4 is pin-connected with a first rotating arm 2. The bottom of the first rotating arm 2 is provided with a crane base 1 for driving the first rotating arm 2 to rotate. The bottom of the front side wall of the first rotating arm 2 is pin-connected with a second rotating arm angle adjusting oil cylinder 3 for driving the second rotating arm 4 to rotate. The movable end of the second rotating arm angle adjusting oil cylinder 3 is pin-connected to the rear side position of the bottom of the second rotating arm 4. The bottom of the second rotating arm 4 is pin-connected with an end rotating arm angle adjusting oil cylinder 5 for driving the end rotating arm 6 to rotate. The movable end of the end rotating arm angle adjusting oil cylinder 5 is pin-connected to the bottom of the end rotating arm 6.

[0041] As Figures 2 - 3 、 Figures 6 - 9 And Figure 12As shown, a damping anti-rolling device 7 is provided below the end of the end rotating arm 6, an anti-sway hook 8 is provided directly below the damping anti-rolling device 7, a hook driving assembly 9 for driving the anti-sway hook 8 to lift and lower is provided inside the end rotating arm 6, and anti-rolling device driving assemblies 10 for driving the damping anti-rolling device 7 to lift and lower are provided at the positions near the front ends on both side walls of the end rotating arm 6. The damping anti-rolling device 7 includes a damper outer casing 71, a damping anti-rolling disc 72 is connected in a limited sliding manner at the center inside the damper outer casing 71, and a plurality of spring-connected banded wedge-shaped rods 76 are connected to the inner side wall of the damper outer casing 71. The inner side wall of the banded wedge-shaped rod 76 abuts against the outer wall of the sliding damping disc 721. A damping mechanism 77 is provided at the position near the lower part inside the damper outer casing 71 and directly below each banded wedge-shaped rod 76. The damping mechanism 77 includes a damping cylinder 772, the damping cylinder 772 is fixed inside the damper outer casing 71, damping medium is stored inside the damping cylinder 772, the bottom of the damping cylinder 772 is connected to a bottom plate 775 through a spring, an outer guiding cylinder 771 for limiting the bottom plate 775 is fixedly connected to the bottom of the damper outer casing 71 and on the outer side wall of the bottom plate 775. A telescopic rod 773 is fixedly connected to the center of the upper side wall of the bottom plate 775. The top of the telescopic rod 773 penetrates through the upper and lower side walls of the damping cylinder 772 and is arranged below the banded wedge-shaped rod 76. Wedge-shaped surfaces that cooperate with each other are provided on the side walls of the telescopic rod 773 and the banded wedge-shaped rod 76 that are close to each other. A perforated plate 774 is fixedly connected to the outer side wall of the telescopic rod 773 arranged inside the damping cylinder 772. When the hook driving steel cable 11 is driven by the goods to shake greatly, the hook driving steel cable 11 will squeeze the sliding damping disc 721, and then drive the sliding damping disc 721 to generate an offset relative to the damper outer casing 71. At this time, under the extrusion of the sliding damping disc 721, the banded wedge-shaped rod 76 in its moving direction is pressed and moves outward, and then presses the telescopic rod 773 to move downward. At this time, the perforated plate 774 moves downward under the drive of the telescopic rod 773. And damping medium is stored in the damping cylinder 772. The damping medium can be a viscous medium such as silicone oil. Specifically, according to the actual working conditions required, the damping medium material is adaptively selected. When the perforated plate 774 moves inside it, the medium will generate viscous frictional force on the surface of the perforated plate 774. For the round holes on the perforated plate 774, the flow velocity of the medium at the edge is different from other parts of the disc surface, and a velocity gradient will be formed. According to viscous fluid mechanics, the velocity gradient will cause the generation of viscous force, and the viscous force does work to consume the mechanical energy of the perforated plate 774 and convert it into heat energy, thereby realizing energy absorption, and then absorbing the energy generated by the shaking of the hook driving steel cable 11 and reducing the swaying amplitude of the hook driving steel cable 11.

[0042] Embodiment 2, as Figure 3 With Figure 6As shown in the figure, on the basis of the first embodiment, this embodiment provides another technical solution. A plurality of tension wheels 73 are installed on the left and right sides of the upper side wall of the damper outer casing 71. A damper drive steel cable 12 is wound around the plurality of tension wheels 73 on the same side. One end of the damper drive steel cable 12 is fixedly connected to the bottom of the end rotating arm 6, and the other end of the damper drive steel cable 12 is wound around the anti-rolling drive assembly 10 on the same side. The anti-rolling drive assembly 10 includes a roller for winding the damper drive steel cable 12, a motor for driving the roller to rotate, and a guide roller for guiding the damper drive steel cable 12.

[0043] As Figure 6 And Figures 10 - 11 As shown in the figure, a tension adjusting mechanism 74 is provided on the front and rear sides of the plurality of tension wheels 73 on the upper side wall of the damper outer casing 71. The tension adjusting mechanism 74 includes two top slide rails 741 fixed to the top of the damper outer casing 71. A tension pulley 742 is connected in a spring-limited sliding manner in each top slide rail 741. A tension adjusting support arm 743 is pin-connected to the outer side walls of the two tension pulleys 742. The tension adjusting support arm 743 is composed of two equal-length frame structures. The two frame structures are respectively pin-connected to the outer sides of the two tension pulleys 742, and the ends of the two frame structures close to each other are pin-connected. The bottom of the inner side wall of the damper outer casing 71 is connected in a ball-rail-limited sliding manner with a steel cable protection mechanism 75. The ball rail can ensure that the leaf spring chassis 751 will not tilt and get stuck when subjected to unilateral pressure. The steel cable protection mechanism 75 includes a leaf spring chassis 751. Springs for supporting the leaf spring chassis 751 are provided between the leaf spring chassis 751 and the bottom of the damper outer casing 71. Chassis pulling steel cables 752 are respectively fixedly connected to the two side walls of the leaf spring chassis 751. The other ends of the two chassis pulling steel cables 752 are respectively sleeved on the shafts at the centers of the tension adjusting support arms 743 on the same side as them. An outer guide pulley 78 for guiding the chassis pulling steel cables 752 is further installed on the outer side wall of the damper outer casing 71.

[0044] Embodiment Three, as Figures 3 - 5As shown in the figure, on the basis of Embodiment 1 and Embodiment 2, this embodiment provides another technical solution. The anti-sway hook 8 includes a hook mounting bracket 81. A movable pulley 83 is rotatably connected to the middle position inside the hook mounting bracket 81. A bottom hook 82 is fixedly connected to the bottom of the hook mounting bracket 81. A hook driving steel cable 11 is wound around the movable pulley 83. One end of the hook driving steel cable 11 is fixed to the bottom of the outer side wall of the end rotating arm 6. The other end of the hook driving steel cable 11 is wound around a hook driving assembly 9. The hook driving assembly 9 includes a roller for winding the hook driving steel cable 11, a motor for driving the roller to rotate, and a guide roller for guiding the hook driving steel cable 11. The lower half of the hook driving steel cable 11 is arranged at the center of the anti-rolling damping disc 72. When the anti-sway hook 8 is driven to the target height by the hook driving assembly 9, the top of the hook mounting bracket 81 fits against the lower side of the sliding damping disc 721. At this time, after the electromagnet 722 is energized, it generates a strong magnetic force, which will drive the movable part at the top of the telescopic iron rod 87 to approach the electromagnet 722. Furthermore, the movable part of the telescopic iron rod 87 is inserted into the horn-shaped groove 86 and attracted to the bottom of the electromagnet 722. Since the horn-shaped groove 86 is in the shape of a horn with a wider bottom and a narrower top, during the swaying process of the load balancing disc 85, as the movable part of the telescopic iron rod 87 penetrates deeper into the interior of the horn-shaped groove 86, the load balancing disc 85 will quickly tend to be stable due to the limitation of the telescopic iron rod 87.

[0045] As Figure 7 , Figures 10 - 11As shown in the figure, the anti-rolling damping disc 72 includes a sliding damping disc 721. An electromagnet 722 is connected to the center of the bottom of the sliding damping disc 721 by a spring. At the outer position near the inner top of the hook mounting frame 81, a plurality of suspension ropes 84 are fixedly connected. The other ends of the plurality of suspension ropes 84 are fixedly connected to a load balancing disc 85. A plurality of horn-shaped grooves 86 are formed on the load balancing disc 85. A telescopic iron rod 87 is installed on the lower inner wall of the hook mounting frame 81 and directly below each horn-shaped groove 86. The telescopic iron rod 87 is used in cooperation with the electromagnet 722. On both sides of the upper side wall of the electromagnet 722, magnet pulling steel ropes 723 are fixedly connected. The other ends of the two magnet pulling steel ropes 723 are sleeved on the shaft rods at the centers of the tension adjustment support arms 743 on the same side as them. An inner guiding pulley 79 for guiding the magnet pulling steel ropes 723 is also installed on the upper side wall of the damper outer casing 71. Since the electromagnet 722 moves closer to the telescopic iron rod 87, that is, the electromagnet 722 moves downward by a certain distance. At this time, the magnet pulling steel ropes 723 drive the tension adjustment support arms 743, and then drive the two tension pulleys 742 to move closer to each other. At this time, driven by the two tension pulleys 742, the damper driving steel cable 12 will be quickly tightened, increasing the tension of the damper driving steel cable 12. This makes it more difficult for the entire anti-rolling damper 7 to move laterally. The anti-rolling damper 7 and the anti-sway hook 8 are magnetically connected by the magnetic force of the electromagnet 722. Therefore, after the goods reach the target height, the swaying of the anti-rolling damper 7 and the anti-sway hook 8 will be quickly restricted, thereby improving the wind resistance and anti-swaying ability of the goods after being lifted to the target height. After the anti-rolling damper 7 and the anti-sway hook 8 are attracted, the anti-rolling damper 7 is driven to rise by the damper driving assembly 10, and then the double-rope structure is used to continue lifting and transferring the goods. At this time, if the goods sway, the acting force on the bottom hook 82 will tend downward, and the goods will drive the anti-sway hook 8 to move downward by a certain distance. The telescopic iron rod 87 will pull the top of the magnet pulling steel rope 723 to move inward. When the magnet pulling steel rope 723 moves inward, it will drive the chassis pulling steel cable 752 to rise through the tension adjustment support arm 743, and use the chassis pulling steel cable 752 to drive a plurality of bottom plates 775 to rise. At this time, the damping mechanism 77 inside the damper outer casing 71 will act together. As the bottom plate 775 rises, the perforated plate 774 moves inside the damping cylinder 772, thereby converting mechanical energy into heat energy, so as to absorb the sway generated by the swaying of the goods, and quickly reduce the swaying of the goods.

[0046] Working principle: This ship crane uses a damping anti-sway device 7 and an anti-sway hook 8 to alternately lift goods. Among them, the anti-sway hook 8 uses a single-rope lifting to match the high movement inertia of the goods at the initial stage of lifting due to the need to quickly leave the water surface or avoid obstacles. At this time, the anti-sway hook 8 installed drives the steel cable 11 of the hook with a single hook to lift the goods, so that the anti-sway hook 8 and the goods form a flexible connection. When the lifted goods are swayed by the wind or waves, the anti-sway hook 8 can swing together with the goods, and its swing frequency, amplitude and the movement trajectory of the goods tend to be consistent. The lateral load is absorbed through the flexible deformation of the rope, and the lifting point only bears the gravity load in the vertical direction, avoiding the tearing or deformation of the lifting point structure caused by the lateral impact. During the process of the goods driving the anti-sway hook 8 to sway, the load balance disk 85 located inside the anti-sway hook 8 is connected by several flexible suspension ropes 84. Therefore, during the swaying process of the anti-sway hook 8, the load balance disk 85 lags behind the goods and the hook mounting bracket 81 due to inertia. Therefore, the tension difference generated in the suspension rope 84 will form a reverse restoring force to inhibit the excessive swaying of the goods, so that the swaying amplitudes of the goods, the load balance disk 85 and the hook mounting bracket 81 quickly converge to the same amplitude within several cycles, greatly reducing the swaying period of the goods, and thus reducing the swaying of the goods.

[0047] When the hook driving steel cable 11 is driven by the goods to sway greatly, the hook driving steel cable 11 will squeeze the sliding damping disk 721, and then drive the sliding damping disk 721 to generate an offset relative to the damper housing 71. At this time, under the extrusion of the sliding damping disk 721, the leaf spring wedge rod 76 in its moving direction is compressed and moves outward, and then presses the telescopic rod 773 to move downward. At this time, the perforated plate 774 moves downward under the drive of the telescopic rod 773. There is a damping medium stored in the damping cylinder 772, and the damping medium has viscosity. When the perforated plate 774 moves in it, the medium will generate viscous friction on the surface of the perforated plate 774. For the round holes on the perforated plate 774, the flow velocity of the medium at the edge is different from other parts of the disk surface, and a velocity gradient will be formed. According to viscous fluid mechanics, the velocity gradient will cause the generation of viscous force, and the viscous force does work to consume the mechanical energy of the perforated plate 774 and convert it into heat energy, thereby realizing energy absorption, and then absorbing the energy generated by the swaying of the hook driving steel cable 11 and reducing the swaying amplitude of the hook driving steel cable 11.

[0048] When the telescopic rod 773 is driven to move downward, the bottom plate 775 at the bottom of the telescopic rod 773 will squeeze the spring belt chassis 751 to slide downward. When the spring belt chassis 751 moves downward, it will pull the tension adjustment support arm 743 through the chassis pulling steel cable 752. Under the pull of the chassis pulling steel cable 752, the two ends of the tension adjustment support arm 743 drive the tension pulleys 742 to move away from each other, reducing the pressure exerted by the tension pulleys 742 on the damper drive cable 12. At this time, the tension of the damper drive cable 12 decreases, allowing the entire damping anti-rolling device 7 to also achieve small-range shaking. This avoids excessive alternating stress on the hook drive cable 11 due to the limitation of the damping anti-rolling device 7. At the same time, when the hook drive cable 11 drives the damping anti-rolling device 7 to shake, the shaking frequency of the damping anti-rolling device 7 is lower than that of the hook drive cable 11. Therefore, within a single shaking cycle of the hook drive cable 11, it will drive the damping anti-rolling device 7 to change the shaking direction, thereby absorbing the energy generated by the shaking of the hook drive cable 11 and reducing the shaking of the hook drive cable 11 and the goods.

[0049] When the anti-sway hook 8 is driven to the target height by the hook drive assembly 9, the top of the hook mounting bracket 81 fits against the lower side of the sliding damping disc 721. At this time, after the electromagnet 722 is energized, it generates a strong magnetic force, which drives the movable part at the top of the telescopic iron rod 87 to approach the electromagnet 722. As a result, the movable part of the telescopic iron rod 87 is inserted into the horn-shaped groove 86 and attracted to the bottom of the electromagnet 722. Since the horn-shaped groove 86 is wider at the bottom and narrower at the top, during the shaking process of the load balancing disc 85, as the movable part of the telescopic iron rod 87 penetrates deeper into the interior of the horn-shaped groove 86, the load balancing disc 85 will quickly tend to be stable due to the limitation of the telescopic iron rod 87. At the same time, because the electromagnet 722 approaches the telescopic iron rod 87, that is, the electromagnet 722 moves downward by a certain distance. At this time, the magnet pulling steel rope 723 drives the tension adjustment support arm 743 and then drives the two tension pulleys 742 to approach each other. At this time, under the drive of the two tension pulleys 742, the damper drive cable 12 will be quickly tightened, increasing the tension of the damper drive cable 12. This makes it more difficult for the entire damping anti-rolling device 7 to move laterally. Since the damping anti-rolling device 7 and the anti-sway hook 8 are magnetically connected by the electromagnet 722, after the goods reach the target height, the shaking of the damping anti-rolling device 7 and the anti-sway hook 8 will be quickly restricted, thereby improving the wind resistance and anti-shaking ability of the goods after being lifted to the target height.

[0050] After the damping anti-rolling device 7 is engaged with the anti-sway hook 8, the anti-rolling device driving assembly 10 drives the damping anti-rolling device 7 to rise, and then the double-rope structure is used to continue lifting and transferring the goods. At this time, if the goods sway, the acting force on the bottom hook 82 tends to be downward, and the goods will drive the anti-sway hook 8 to move downward a certain distance. The telescopic iron rod 87 will pull the top of the magnet pulling steel rope 723 to move inward. When the magnet pulling steel rope 723 moves inward, it will drive the chassis pulling steel cable 752 to rise through the tension adjustment support arm 743, and use the chassis pulling steel cable 752 to drive several bottom plates 775 to rise. At this time, the damping mechanism 77 inside the damper housing 71 will act together. As the bottom plate 775 rises, the perforated plate 774 moves inside the damping cylinder 772, and then converts mechanical energy into heat energy, thereby absorbing the sway generated by the sway of the goods, so that the sway of the goods can be quickly reduced.

[0051] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A jib assembly of a ship crane capable of reducing roll, including a distal rotating arm, characterized in that, A damping anti-rolling device is provided below the end of the end rotating arm. An anti-sway hook is provided directly below the damping anti-rolling device. A hook driving assembly for driving the anti-sway hook to lift and lower is arranged inside the end rotating arm. Anti-rolling device driving assemblies for driving the damping anti-rolling device to lift and lower are arranged at the front-end positions on both side walls of the end rotating arm. The damping anti-rolling device includes a damper outer casing. A sway damping disc is connected in a limited and sliding manner at the center inside the damper outer casing. A number of spring-connected spring-loaded wedge-shaped rods are arranged on the inner side wall of the damper outer casing. The inner side walls of the spring-loaded wedge-shaped rods abut against the outer wall of the sliding damping disc. A damping mechanism is arranged at the lower position inside the damper outer casing and directly below each spring-loaded wedge-shaped rod. The damping mechanism includes a damping cylinder fixed inside the damper outer casing. Damping medium is stored inside the damping cylinder. A bottom plate is connected to the bottom of the damping cylinder by a spring. An outer guiding cylinder for limiting the bottom plate is fixedly connected to the bottom of the damper outer casing and on the outer side wall of the bottom plate. A telescopic rod is fixedly connected to the center of the upper side wall of the bottom plate. The top of the telescopic rod penetrates through the upper and lower side walls of the damping cylinder and is arranged below the spring-loaded wedge-shaped rod. Wedge-shaped surfaces that cooperate with each other are arranged on the side walls of the telescopic rod and the spring-loaded wedge-shaped rod that are close to each other. A perforated plate is fixedly connected to the outer side wall of the telescopic rod arranged inside the damping cylinder. The anti-sway hook includes a hook mounting frame. A movable pulley is rotatably connected at the middle position inside the hook mounting frame. A bottom hook is fixedly connected to the bottom of the hook mounting frame. A hook driving steel cable is wound around the movable pulley. One end of the hook driving steel cable is fixed to the bottom of the outer side wall of the end rotating arm. The other end of the hook driving steel cable is wound around the hook driving assembly. The hook driving assembly includes a roller for winding the hook driving steel cable, a motor for driving the roller to rotate, and a guiding roller for guiding the hook driving steel cable. And the lower half of the hook driving steel cable is arranged at the center of the sway damping disc. The sway damping disc includes a sliding damping disc. An electromagnet is connected to the center of the bottom of the sliding damping disc by a spring. A number of suspension ropes are fixedly connected to the outer side position of the inner top of the hook mounting frame. The other ends of the number of suspension ropes are fixedly connected to a load balancing disc. A number of horn-shaped grooves are formed on the load balancing disc. Telescopic iron rods are installed on the lower inner wall of the hook mounting frame and directly below each horn-shaped groove. The telescopic iron rods are used in cooperation with the electromagnet.

2. A roll-reducing ship crane boom assembly according to claim 1, characterized in that, A number of tension wheels are installed at the left and right positions on the upper side wall of the damper outer casing. A damper driving steel cable is wound around the number of tension wheels on the same side. One end of the damper driving steel cable is fixedly connected to the bottom of the end rotating arm. The other end of the damper driving steel cable is wound around the anti-rolling device driving assembly on the same side. The anti-rolling device driving assembly includes a roller for winding the damper driving steel cable, a motor for driving the roller to rotate, and a guiding roller for guiding the damper driving steel cable.

3. A swing-reducing ship crane boom assembly according to claim 2, characterized in that, Tension adjustment mechanisms are provided on the upper side wall of the damper outer casing and located on the front and rear sides of a number of tension wheels. The tension adjustment mechanisms include two top slide rails fixed to the top of the damper outer casing. Each top slide rail is connected with a tension pulley in a spring-limited sliding manner. A tension adjustment support arm is pin-connected to the outer side walls of the two tension pulleys. The tension adjustment support arm consists of two equal-length frame structures. The two frame structures are respectively pin-connected to the outer sides of the two tension pulleys, and the ends of the two frame structures close to each other are pin-connected.

4. A swing-reducing ship crane boom assembly according to claim 3, characterized in that, A steel cable protection mechanism is connected to the bottom of the inner side wall of the damper outer casing in a ball rail-limited sliding manner. The steel cable protection mechanism includes a spring-bottom chassis. A spring for supporting the spring-bottom chassis is provided between the spring-bottom chassis and the bottom of the damper outer casing. Pulling steel cables of the chassis are fixedly connected to the two side walls of the spring-bottom chassis respectively. The other ends of the two pulling steel cables of the chassis are respectively sleeved on the shaft rods at the centers of the tension adjustment support arms on the same side as them. An outer guiding pulley for guiding the pulling steel cables of the chassis is further installed on the outer side wall of the damper outer casing.

5. A swing-reducing ship crane boom assembly according to claim 4, characterized in that, Magnet pulling steel ropes are fixedly connected to the two sides of the upper side wall of the electromagnet. The other ends of the two magnet pulling steel ropes are sleeved on the shaft rods at the centers of the tension adjustment support arms on the same side as them. An inner guiding pulley for guiding the magnet pulling steel ropes is further installed on the upper side wall of the damper outer casing.

6. A boom assembly of a ship crane capable of reducing roll, characterized in that, A second rotating arm is pin-connected to the rear side wall of the end rotating arm. A first rotating arm is pin-connected to the bottom of the second rotating arm. A crane base for driving the first rotating arm to rotate is installed at the bottom of the first rotating arm. A second rotating arm angle adjustment oil cylinder for driving the second rotating arm to rotate is pin-connected to the bottom of the front side wall of the first rotating arm. The movable end of the second rotating arm angle adjustment oil cylinder is pin-connected to the position near the rear side of the bottom of the second rotating arm. A end rotating arm angle adjustment oil cylinder for driving the end rotating arm to rotate is pin-connected to the bottom of the second rotating arm. The movable end of the end rotating arm angle adjustment oil cylinder is pin-connected to the bottom of the end rotating arm.

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