Marine crane

Abstract

The present invention provides a marine crane, characterized in that it comprises: a crane body, and at least one hydraulic rotating boom arranged on the crane body, wherein the hydraulic rotating boom is arranged on one side of the crane body, the hydraulic rotating boom is pivotally arranged on the side of the crane body, the hydraulic rotating boom comprises a boom, a rotating cylinder for driving the boom to move, and a connecting mechanism arranged between the boom and the rotating cylinder, wherein the rotating cylinder is fixed to the crane body, and the rotating cylinder is used to drive the boom to rotate.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a ship-mounted traveling crane. Background Art

[0002] There are a large number of small multi-purpose ships active in Europe. With their small size, flexibility and diverse functions, these ships play an indispensable role in local marine economic activities. They are widely used in many fields such as offshore bulk cargo transportation, large-scale transportation, container transportation, etc., meeting the actual needs in different scenarios.

[0003] In the construction and equipment configuration of these small multi-purpose ships, the hatch cover crane is an extremely critical equipment. As an important component used to close and open the cabin on the ship, the hatch cover is usually heavy and requires special lifting equipment to operate. The hatch cover crane came into being and took on the important task of lifting and operating the hatch cover. Through the precise lifting and moving functions of the crane, the crew can easily open or close the hatch, facilitate the loading and unloading of cargo, the entry and exit of personnel in the cabin, and the maintenance of the equipment in the cabin, which greatly improves the efficiency and convenience of ship operation.

[0004] In addition, this type of crane is often equipped with two small booms. Although their lifting capacity is less than 1 ton, their role should not be underestimated. When a ship docks, there are often various spare parts, tools, daily necessities and other sundries on the shore that need to be lifted onto the ship, and the small boom becomes a powerful assistant to complete this task. It can easily lift these items on the shore, and then move the goods to a suitable position on the ship with the overall translation function of the crane. Then, relying on its own lifting advantages, the goods are accurately lifted from the small hatch into the corresponding areas inside the ship such as the engine room, thereby realizing the efficient transfer of goods from the shore to the designated location inside the ship, providing strong support for the daily operation activities of the ship such as material replenishment, equipment maintenance and replacement.

[0005] In view of the above functions of the small boom, it has specific requirements in structural design, one of which is that it needs to have a certain length. The appropriate length can ensure that the lifting range of the small boom covers the area between the shore and the ship, as well as between different hatches and internal areas on the ship, so that it can reach the target location more flexibly and conveniently when lifting cargo. Whether it is lifting items from the shore to the ship, or transferring cargo on the ship to different cabins, the operation can be completed smoothly, avoiding the situation where the lifting is difficult or the target location cannot be reached due to insufficient boom length.

[0006] At the same time, it is also crucial that the small boom has a rotatable function. In actual use, when the ship is docked at the dock, the small boom is usually initially in the stowed position to ensure that it does not take up too much space when the ship is sailing or not performing lifting operations, and to avoid damage due to accidental collisions and other situations. When it is necessary to lift the cargo on the shore, the small boom needs to be rotated from the stowed position to the dock position, and the cargo is lifted up by the electric hoist and other lifting devices installed on the boom, and then rotated back to the ship to transfer the cargo to the corresponding area. This rotation function gives the small boom a full range of operating capabilities, enabling it to flexibly adjust its direction according to actual lifting needs, and cooperate with the translation function of the crane to achieve efficient lifting of cargo in different positions, further enhancing the practicality and functionality of the entire hatch cover crane system in ship material transfer.

[0007] In the past, the rotation of this type of small boom was usually achieved manually. During the specific operation, the operator needs to stand on the crane and use his own strength to manually pull or push the boom to cause the boom to rotate around its rotation axis, thereby completing the operation of adjusting the direction from the storage position to the dock position and between different areas on the ship.

[0008] However, this traditional manual rotation method has many obvious disadvantages. First, from the perspective of operational convenience, manually pulling or pushing the boom requires the operator to exert a lot of physical strength, especially when the small boom is long or the cargo is heavy. The operator needs to spend a lot of effort to rotate the boom smoothly. The whole operation process is time-consuming and labor-intensive, which seriously affects the efficiency of cargo lifting. Moreover, since it relies on direct human operation, it is difficult to accurately and smoothly control the rotation angle and speed of the boom, and it is easy for the boom to rotate too fast or not in place, which in turn poses a potential safety threat to the cargo being lifted and the surrounding personnel and equipment.

[0009] More importantly, it is extremely dangerous for operators to stand on the crane to perform manual operations. The crane is usually at a certain height, and the surrounding environment on the ship is relatively complex, with many unstable factors. For example, the ship may shake and sway with the waves. Operators may easily lose balance and fall in the process of pushing and pulling the boom. Once this happens, they are likely to fall from the crane, causing serious personal injury. In addition, during manual operation, if there are unexpected situations such as the boom getting stuck or encountering large external force obstacles, the operator is more likely to be injured accidentally due to close contact with the boom. The existence of these dangerous situations brings hidden dangers to the life safety of the crew that cannot be ignored, and also makes the daily operation of the ship face certain risks.

[0010] In summary, the traditional manual rotation method can no longer meet the actual operation requirements of the small boom of the hatch cover crane on small multi-purpose ships. There is an urgent need for a safer, more efficient and convenient rotation operation method to replace it, so as to improve the overall efficiency of ship material lifting and ensure the safety of operators. Summary of the invention

[0011] A major advantage of the present invention is that it provides a marine crane, wherein the crane adopts a rotating oil cylinder to drive the eye plate on the boom to achieve rotational movement. Relying on the oil cylinder drive is more labor-saving and convenient, greatly improving the efficiency of the boom rotation operation, no longer relying on manpower, avoiding the problem of difficulty in accurately controlling the rotation angle and speed due to manual operation, and making the rotation process more accurate and smooth.

[0012] Another advantage of the present invention is to provide a marine crane, wherein a rotary cylinder is used as a driving element and the structure is compact.

[0013] Another advantage of the present invention is to provide a marine crane, wherein the crane can realize the rotation of the boom without making the structure complicated and bloated, and the overall structure is simpler.

[0014] Another advantage of the present invention is that it provides a ship crane that occupies a small space, avoiding the problem of greatly increasing the space due to additional devices. For the limited space on the ship, it is more conducive to the reasonable layout and installation of equipment, and will not affect other operations or equipment placement of the ship due to excessive space occupation.

[0015] Another advantage of the present invention is that it provides a ship-mounted crane, in which the rotating cylinder drive method makes the boom more stable during the rotation process, and is not prone to unexpected situations due to external factors (such as ship shaking) and the instability of the operation itself as manual operation, thereby ensuring the stability of the boom during rotation operations.

[0016] Another advantage of the present invention is that it provides a ship crane, wherein the hydraulic rotating boom has the advantage of a simple and compact structure, reduces the hidden dangers of failure caused by a complex structure, has higher overall reliability, can better and continuously complete the boom rotation task, and ensures smooth progress of the ship lifting work.

[0017] Another advantage of the present invention is that it provides a marine crane, wherein the marine crane is capable of driving the boom to rotate 180°, thereby meeting the practical needs of rotating from a stowed position to a dock position and flexibly adjusting the direction between various areas on the ship, thereby expanding the operating range and flexibility of the boom, and significantly improving the functionality compared to traditional manual rotation methods.

[0018] According to one aspect of the present invention, a marine crane of the present invention that can achieve the aforementioned objects and other objects and advantages includes:

[0019] A traveling crane body, and at least one hydraulic rotating boom arranged on the traveling crane body, wherein the hydraulic rotating boom is arranged on one side of the traveling crane body, the hydraulic rotating boom is pivotally arranged on the side of the traveling crane body, the hydraulic rotating boom comprises a boom, a rotating cylinder driving the boom to move, and a connecting mechanism arranged between the boom and the rotating cylinder, wherein the rotating cylinder is fixed to the traveling crane body, and the rotating cylinder is used to drive the boom to rotate.

[0020] According to one embodiment of the present invention, the traveling crane body further comprises at least one mounting bracket, wherein the mounting bracket is arranged at an end of the crane frame, and the hydraulic rotating boom is arranged on the mounting bracket.

[0021] According to an embodiment of the present invention, the connecting mechanism is disposed between the boom and the rotating cylinder, and is used to fix the boom to the rotating cylinder, so that the boom rotates synchronously with the rotating cylinder.

[0022] According to an embodiment of the present invention, the connection mechanism is implemented as an eye plate.

[0023] According to one embodiment of the present invention, the boom can be driven by the rotary cylinder to rotate 180°.

[0024] According to one embodiment of the present invention, the hydraulic rotating boom further comprises at least one locking mechanism, wherein the locking mechanism is arranged outside the rotating cylinder and the connecting mechanism, and is used to fix the connecting mechanism and the rotating cylinder.

[0025] According to one embodiment of the present invention, the hydraulic rotating boom further comprises at least two limit stops, wherein the limit stops are arranged on the mounting bracket, which are opposite to the boom, and when the boom of the hydraulic rotating boom is rotated to be close to the mounting bracket, the limit stops block the rotation of the boom.

[0026] According to an embodiment of the present invention, the limit blocks are symmetrically arranged on both sides of the rotating cylinder.

[0027] According to one embodiment of the present invention, the hydraulic rotating boom further comprises at least one fixing mechanism, wherein the fixing mechanism is arranged between the boom and the main body of the crane, and is used to fix the boom to one side of the main body of the crane.

[0028] According to one embodiment of the present invention, the boom further includes a boom connecting end and a boom working end extending integrally from the boom connecting end, wherein the boom connecting end is connected to the rotating cylinder, and the boom working end of the boom extends outward from the boom connecting end.

[0029] Further objects and advantages of the present invention will be fully apparent from an understanding of the following description and the accompanying drawings.

[0030] These and other objects, features and advantages of the present invention will be more fully understood from the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a marine crane according to a first preferred embodiment of the present invention.

[0032] Figure 2 It is a schematic structural diagram of the hydraulic rotating boom of the overhead crane according to the first preferred embodiment of the present invention.

[0033] Figure 3 It is a schematic diagram of the action of the hydraulic rotating boom of the overhead crane according to the first preferred embodiment of the present invention.

[0034] Figure 4 It is a schematic diagram of the partial structure of the hydraulic rotating boom of the overhead crane according to the first preferred embodiment of the present invention.

[0035] Figure 5 A schematic structural diagram of the boom body of the hydraulic rotating boom of the overhead crane according to the first preferred embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0037] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0038] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0039] Referring to the drawings of this application specification Figures 1 to 5 As shown, a marine crane according to the first preferred embodiment of the present application is explained in the following description. The marine crane is hereinafter referred to as a crane, wherein the crane is suitable for being installed on the deck of a ship and is used to lift cargo inside and outside the ship.

[0040] The traveling crane comprises a traveling crane body 10, and at least one hydraulic rotating boom 20 disposed on the traveling crane body 10, wherein the hydraulic rotating boom 20 is disposed on one side of the traveling crane body 10, the hydraulic rotating boom 20 is pivotably disposed on the side of the traveling crane body 10, and the hydraulic rotating boom 20 is pivotably switched between an extended position and a stored position. When the hydraulic rotating boom 20 is in the stored position, the hydraulic rotating boom 20 is rotated to the side of the traveling crane body 10, and the hydraulic rotating boom 20 overlaps with the traveling crane body 10, which is convenient for storage; when the hydraulic rotating boom 20 is in the extended position, the hydraulic rotating boom 20 extends outward from the end of the traveling crane body 10, which is convenient for lifting cargo from the outside of the hull.

[0041] Specifically, the crane body 10 includes a crane frame 11 and at least one sling 12 arranged on the crane frame 11 , wherein the hydraulic rotating boom 20 is arranged on one side of the crane frame 11 , and the crane frame 11 supports the hydraulic rotating boom 20 and the at least one sling 12 .

[0042] The crane body 10 further includes at least one mounting bracket 13, wherein the mounting bracket 13 is disposed at the end of the crane frame 11, and the hydraulic rotating boom 20 is disposed on the mounting bracket 13. It is worth mentioning that in this preferred embodiment of the present application, the mounting bracket 13 protrudes outside the crane frame 11, and the mounting bracket 13 is located at the end of the crane frame 11.

[0043] The hydraulic rotating boom 20 includes a boom 21, a rotating oil cylinder 22 for driving the boom 21 to move, and a connecting mechanism 23 provided between the boom 21 and the rotating oil cylinder 22, wherein the rotating oil cylinder 22 is fixed to the mounting bracket 13 of the crane body 10, and the rotating oil cylinder 22 is used to drive the boom 21 to rotate. The connecting mechanism 23 is provided between the boom 21 and the rotating oil cylinder 22, and is used to fix the boom 21 to the rotating oil cylinder 22, so that the boom 21 rotates synchronously with the rotating oil cylinder 22.

[0044] Preferably, in the preferred embodiment of the present application, the hydraulic rotating boom 20 is disposed on both sides of the traveling crane body 10 , that is, the number of the hydraulic rotating boom 20 of the traveling crane is two.

[0045] As an example, in a specific example of the present application, the connection mechanism 23 is implemented as an eye plate.

[0046] It is to be understood that the specific type of the connection mechanism 23 is merely exemplary and not limiting.

[0047] It is worth mentioning that in this preferred embodiment of the present application, the boom 21 can be driven by the rotating cylinder 22 to rotate 180°, that is, when the boom 21 is in the deployed position and when the boom 21 is in the stored position, the boom 21 is parallel and in opposite directions.

[0048] The rotating oil cylinder 22 has a rotating shaft, wherein the rotating shaft of the rotating oil cylinder 22 is coaxially connected with the connecting mechanism 23, and the rotating oil cylinder 22 drives the connecting mechanism 23 to rotate synchronously through the rotating shaft. The hydraulic rotating boom 20 further includes at least one locking mechanism 24, wherein the locking mechanism 24 is arranged on the outside of the rotating oil cylinder 22 and the connecting mechanism 23, and is used to fix the connecting mechanism 23 and the rotating oil cylinder 22.

[0049] The hydraulic rotating boom 20 further includes at least two limit blocks 25, wherein the limit blocks 25 are arranged on the mounting bracket 13, opposite to the boom 21. When the boom 21 of the hydraulic rotating boom 20 is rotated to be close to the mounting bracket 13, the limit blocks 25 block the rotation of the boom 21, thereby preventing the hydraulic rotating boom 20 from excessively rotating or even colliding with the crane body 10.

[0050] Preferably, the limit blocks 25 are symmetrically arranged on both sides of the rotating cylinder 22 .

[0051] The boom 21 further includes a boom connecting end 211 and a boom working end 212 extending integrally from the boom connecting end 211 , wherein the boom connecting end 211 is connected to the rotating cylinder 22 , and the boom working end 212 of the boom 21 extends outward from the boom connecting end 211 .

[0052] The boom 21 further includes a bushing 213 , wherein the bushing 213 is disposed at the boom connection end 211 of the boom 21 , and the bushing 213 of the boom 21 is connected to the connection mechanism 23 .

[0053] As an example, in a specific example of the present application, the bushing 213 is fixedly connected to the connecting mechanism 23 by rivets or screws.

[0054] The hydraulic rotating boom 20 further includes at least one fixing mechanism 26 , wherein the fixing mechanism 26 is disposed between the boom 21 and the crane body 10 , and is used to fix the boom 21 to one side of the crane body 10 .

[0055] It can be understood that one end of the boom 21 is connected to the crane body 10 via a rotatable connecting shaft, so that the boom 21 can rotate around the connecting shaft, and the other end is equipped with an electric hoist, which is connected to the cargo to be lifted through a hook and other devices to realize the lifting operation of the cargo.

[0056] The rotating oil cylinder 22 is the core element for driving the boom 21 to rotate. It is installed on the main body 10 of the crane and is closely connected to the boom 21. Specifically, the cylinder body of the rotating oil cylinder 22 is fixed to the mounting bracket 13 of the crane by high-strength bolts. The mounting bracket 13 can withstand various forces generated by the oil cylinder during the driving process to ensure the stability of the overall structure. The piston rod end of the rotating oil cylinder 22 is connected to the connecting mechanism 23 on the boom 21 through a connecting joint. The connecting mechanism 23 is welded at a suitable position of the boom 21 (usually close to the end connected to the crane). Its shape and size are compatible with the connecting joint at the end of the piston rod to ensure that the two are firmly connected and can flexibly transmit force, so that the rotating oil cylinder 22 can accurately drive the boom 21 to rotate around the connecting axis during the telescopic action.

[0057] When the ship docks and needs to lift the cargo on the shore, the small boom 21 is usually in the stowed position. At this time, the hydraulic system of the hydraulically rotating small boom 21 is in standby state, and the components are firmly connected. The piston rod of the rotating cylinder 22 is in a retracted state. The small boom 21 is at a certain angle to the direction of the dock (such as perpendicular to the direction of the dock, and the specific angle can be determined according to the actual docking situation of the ship and the equipment layout), and the hook of the electric hoist is in a retracted state, waiting to hang and pick up cargo.

[0058] The operator starts the hydraulic system and controls the hydraulic circuit of the rotating cylinder 22, so that the hydraulic oil enters a chamber of the cylinder and pushes the piston rod to rotate. Since the piston rod is connected to the boom 21 through the eye plate, under the force of the piston rod rotation, the boom 21 begins to rotate around the connecting axis with the traveling crane, and gradually rotates from the storage position to the dock position. Thanks to the good driving performance and structural design of the rotating cylinder 22, the boom 21 can be rotated smoothly and accurately to a suitable angle, so that the electric hoist on it is just aligned with the cargo to be lifted on the shore. Subsequently, the operator operates the electric hoist to lower the hook, and after hanging the cargo, starts the lifting function of the electric hoist, lifts the cargo to a certain height off the ground (the lifting height is determined according to the cargo situation and the lifting safety requirements), and prepares for transfer to the ship.

[0059] After the cargo is lifted, the operator controls the hydraulic circuit of the rotating cylinder 22 again, so that the hydraulic oil enters the other chamber of the cylinder, pulls the piston rod to rotate, and drives the boom 21 to rotate in the opposite direction, rotating from the dock position back to the ship. Since the hydraulic rotating small boom 21 of the present invention can drive the boom 21 to rotate 180°, it is easy to complete the angle conversion from facing the dock to facing the ship. Afterwards, through the overall translation function of the crane, the small boom 21 with the cargo is translated to a suitable position, such as the position above the small hatch, so that the cargo can be subsequently lifted from the small hatch into the internal area of ​​the ship such as the engine room.

[0060] In order to more intuitively demonstrate the advantages of the present invention using the rotating oil cylinder 22, we assume that a conventional oil cylinder drive solution is used to achieve the same rotation function of the boom 21 for comparative operation. Under the conventional solution, in addition to the oil cylinder itself, additional devices such as connecting rods are required to connect the oil cylinder and the boom 21 to build a suitable transmission structure to achieve the rotation of the boom 21. During installation, a larger space needs to be reserved on the crane to arrange these complex components, and more time needs to be spent on debugging and calibration between the components to ensure that they can work together.

[0061] When the boom 21 is rotated, the force transmission process is relatively complicated due to the addition of intermediate transmission components such as connecting rods, which is prone to jamming and delays, resulting in the boom 21 not rotating smoothly and making it difficult to accurately control the rotation angle. Moreover, after long-term use, the entire structure is more prone to failure due to the large number of components and complex connections, and its reliability is significantly reduced. The hydraulic rotating boom 21 of the present invention, in the same operating scenario, has a compact structure and does not require additional complex connecting rod devices, making the operation process simpler and more efficient. The advantage of occupying a small space makes the spatial layout around the crane more reasonable. At the same time, it has good stability and high reliability, and can quickly and accurately complete the rotation operation of the boom 21 from the storage position to the dock position and then back to the ship, significantly improving the efficiency and safety of lifting cargo.

[0062] Compared with the traditional manual rotation method, when the hydraulically rotating boom 21 is used for cargo lifting, the average time consumed for each rotation operation is shortened from the original [average time consumed for manual operation] minutes to [average time consumed for hydraulic rotation operation] minutes, which greatly improves the lifting efficiency and reduces the time cost of operations such as ship docking and replenishment, allowing the ship to be put into subsequent operational tasks more quickly.

[0063] In the past, when the traditional manual rotation method was used, the ship operation records showed that the accident rate of operators falling and getting injured due to manual operation of the boom 21 rotation was about [X]% (fill in according to actual statistical data). Since the replacement of the hydraulic rotating small boom 21 of the present invention, since the operator no longer needs to stand on the crane to manually push and pull the boom 21, the safety hazard of losing balance on the shaking crane due to manual operation has been eliminated. So far, no casualties have occurred due to the rotation operation of the boom 21, which significantly improves the safety of ship lifting operations.

[0064] Through actual measurement, it is found that the hydraulic rotating small boom 21 of the present invention reduces the space occupied by about [specific reduced space ratio value]% on the crane compared to similar equipment using conventional oil cylinder drive solutions (with connecting rods, etc.), freeing up more available space for the installation and layout of other equipment on the ship and optimizing the overall equipment layout. At the same time, during long-term use, the hydraulic rotating small boom 21 has a simple and compact structure, and the failure rate is reduced by about [specific reduced failure ratio value]% compared to conventional solutions. The reliability of the equipment is effectively guaranteed, reducing the interruption of ship operations caused by equipment maintenance, and improving the overall operational efficiency and economic benefits of the ship.

[0065] The hydraulic rotating small boom 21 in this embodiment, in the hatch cover crane system of a small multi-purpose ship, effectively solves the problems of the traditional manual rotation method being time-consuming, labor-intensive and dangerous, as well as the defects of the conventional cylinder drive solution such as large space occupancy, complex structure and low reliability through its innovative structural design and reasonable operation method. It has demonstrated good advantages in operating efficiency, safety and equipment reliability in actual applications, and has high practical value and promotion prospects.

[0066] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Marine crane, characterized in that: include: A traveling crane body, and at least one hydraulic rotating boom arranged on the traveling crane body, wherein the hydraulic rotating boom is arranged on one side of the traveling crane body, the hydraulic rotating boom is pivotally arranged on the side of the traveling crane body, the hydraulic rotating boom comprises a boom, a rotating cylinder driving the boom to move, and a connecting mechanism arranged between the boom and the rotating cylinder, wherein the rotating cylinder is fixed to the traveling crane body, and the rotating cylinder is used to drive the boom to rotate.

2. The marine crane according to claim 1, wherein the crane body further comprises at least one mounting bracket, wherein the mounting bracket is disposed at an end of the crane frame, and the hydraulic rotating boom is disposed on the mounting bracket.

3. The marine crane according to claim 2, wherein the connecting mechanism is arranged between the boom and the rotating cylinder, and is used to fix the boom to the rotating cylinder so that the boom rotates synchronously with the rotating cylinder.

4. The marine crane according to claim 3, wherein the connection mechanism is implemented as an eye plate.

5. The marine crane according to claim 4, wherein the boom can be driven by the rotary cylinder to rotate 180°.

6. The marine crane according to claim 5, wherein the hydraulic rotating boom further comprises at least one locking mechanism, wherein the locking mechanism is arranged on the outside of the rotating cylinder and the connecting mechanism, and is used to fix the connecting mechanism and the rotating cylinder.

7. The marine crane according to claim 6, wherein the hydraulic rotating boom further comprises at least two limit stops, wherein the limit stops are arranged on the mounting bracket, opposite to the boom, and when the boom of the hydraulic rotating boom is rotated to be close to the mounting bracket, the limit stops block the rotation of the boom.

8. The marine crane according to claim 7, wherein the limit blocks are symmetrically arranged on both sides of the rotating cylinder.

9. The marine crane according to claim 7, wherein the hydraulic rotating boom further comprises at least one fixing mechanism, wherein the fixing mechanism is disposed between the boom and the crane body, and is used to fix the boom to one side of the crane body.

10. The marine crane according to claim 7, wherein the boom further comprises a boom connecting end and a boom working end extending integrally from the boom connecting end, wherein the boom connecting end is connected to the rotating cylinder, and the boom working end of the boom extends outward from the boom connecting end.

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