Gantry cranes used in dock operations and their operating methods

Abstract

This invention belongs to the field of crane technology, specifically relating to a gantry crane for dock operations and its usage method. The crane includes a lifting mechanism for dockside lifting operations; a floating body for mounting and supporting the lifting mechanism during water operations; a hollow central area of ​​the floating body providing a working area for the lifting mechanism; and a water tank on the floating body, with the center of gravity adjusted by controlling the water level in the tank. By adjusting the center of gravity through the water tank, this invention effectively adapts to changes in the marine operating environment. In operation, increasing the water level in the tank lowers the floating body's center of gravity, enhancing stability; in movement, decreasing the water level raises the center of gravity, facilitating rapid movement. This dynamic adjustment mechanism significantly improves equipment safety and operational efficiency.

Description

Technical Field

[0001] This invention belongs to the field of crane technology, specifically relating to a gantry crane for dock operations and its usage method. Background Technology

[0002] A wharf is a key facility in a port, primarily used for ship berthing. It is typically built on the shore or in the water to facilitate a range of operations, including cargo loading and unloading, passenger embarkation and disembarkation, and ship maintenance. Cranes play an indispensable role in port logistics, serving as crucial tools for efficient cargo handling and transportation between ships and land. The effective operation of these facilities ensures smooth and efficient port logistics. However, existing wharf cranes present the following problems in actual port logistics processes:

[0003] Firstly, quay cranes (also known as quay container cranes) are one of the most common types of cranes used in dock operations. These cranes are typically fixed to the edge of the quay, and although their range of motion is limited, it is sufficient to meet the needs of efficient operations in a specific area. For precise loading and unloading operations, the vessel must first berth alongside the quay crane and ensure precise alignment. However, berthing alongside is a highly technical operation, especially in busy ports where berth resources are scarce, placing higher demands on vessel berthing. Accurately calculating the vessel's position is crucial to avoid collisions with other vessels or port facilities. In narrow channels or berths, the limited operating space further increases the difficulty of berthing. Sometimes, tugboats are needed to assist vessels in berthing alongside. Tugboats can provide the necessary thrust or pull force, helping large vessels to more accurately control their position and direction.

[0004] Secondly, most existing cranes are fixedly installed on the shore. Their use requires the laying of dedicated tracks and the construction of power supply systems, resulting in relatively high construction and maintenance costs. Furthermore, fixed cranes at the waterfront are typically designed for specific types of operations, such as container loading and unloading or bulk cargo handling, thus limiting their functionality. Because these cranes are fixed in specific locations, they struggle to adapt to the ever-changing multi-purpose needs within the port, especially when dealing with vessels of different types and sizes, where insufficient flexibility becomes a major constraint.

[0005] Finally, coastal areas are significantly affected by wind, waves, and typhoons, posing additional challenges to cranes anchored on the shore. Wind and waves can cause cranes to sway, affecting operational accuracy and safety, and even damaging the crane's structure and components. During typhoons, equipment and personnel safety face even greater risks.

[0006] In summary, the existing technology has at least the following technical problems: the cranes fixed on the shore are significantly inadequate in terms of lateral docking, construction and maintenance costs, functional flexibility, and ability to cope with severe weather conditions. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a gantry crane for dock operations and a method of using the same, so as to solve the problems existing in the above-mentioned background art.

[0008] To solve the above-mentioned technical problems, the technical solution of the present invention is a gantry crane for dock operations, characterized in that the crane includes a lifting mechanism for lifting operations at the dock; a float for installing and supporting the lifting mechanism for operations on water, the middle area of ​​the float being hollow to provide a working area for the lifting mechanism on water; the float has a water storage tank, and the center of gravity of the float is changed by controlling the amount of water stored in the water storage tank; when the amount of water stored in the water storage tank increases, the center of gravity of the float decreases to ensure the stability of the crane during water operations; when the amount of water stored in the water storage tank decreases, the center of gravity of the float shifts to facilitate the movement and transfer of the crane.

[0009] Preferably, to ensure the stability and balance of the float, the water storage tank is divided into multiple water storage chambers: the water storage tank is equipped with a partition, which divides the water storage tank into several water storage chambers, thereby reducing the change in the center of gravity of the float caused by the fluctuation of the water level in the water storage tank, and ensuring the stability and balance of the float; the partition has through holes on both sides, which connect the several water storage chambers to each other, preventing the center of gravity of the float from shifting and causing the crane to overturn.

[0010] Preferably, to avoid excessive impact from seawater: the two ends of the float are respectively provided with a flow guide plate and a buffer plate in the length direction, and the two ends of the float in the length direction are the near end and the far end according to the distance from the shore; the flow guide plate is provided on the far end of the float to mitigate the impact of the water flow on the float; the buffer plate is provided on the near end of the float to mitigate the collision between the crane and the shore.

[0011] Furthermore, the working principle of the guide plate and the buffer plate is as follows: the guide plate is fixedly installed on the far end of the float; a telescopic cavity is opened on the near end of the float, the buffer plate is slidably installed on the port of the telescopic cavity, and a return spring is also provided between the buffer plate and the telescopic cavity; a buffer cavity is above the telescopic cavity, the buffer cavity and the telescopic cavity are connected, and the telescopic cavity is filled with liquid.

[0012] Furthermore, regarding the water supply, drainage, and cleaning of the water storage tank: the water storage tank is equipped with an inlet module and an outlet module, which control the water volume within the tank. During operation, the inlet module draws water from the natural environment to increase the water volume in the tank; the outlet module discharges water from the tank to reduce the water volume. The water storage tank is also equipped with a cleaning module, which includes spray heads for cleaning the tank and the partition. During cleaning, the inlet module connects to the city's water supply system to provide water to the cleaning module. A reversing valve is installed between the inlet module, the cleaning module, and the water storage tank. During operation, the reversing valve connects the inlet module and the interior of the water storage tank to increase the water volume; during cleaning, the reversing valve connects the inlet module and the cleaning module to provide water to the cleaning module.

[0013] Furthermore, the internal configuration of the water storage tank during operation and cleaning: the partition is rotatably installed inside the water storage tank, and the partition can switch between operation and cleaning states; the partitions inside the water storage tank are spaced apart along the length of the water storage tank; when the partition is in operation state, the plane of the partition is parallel to the width direction of the water storage tank; when the partition is in cleaning state, the plane of the partition is parallel to the length direction of the water storage tank, and all the partitions are on the same plane.

[0014] Furthermore, the structure of the partition inside the water storage tank is as follows: the partition includes a plate and a rotating rod that drives the plate to rotate. One end of the rotating rod is fixedly connected to a connecting rod. The connecting rods are arranged in parallel and are rotatably connected to a control rod. The movement of the control rod causes the connecting rod to swing, thereby driving the partition to rotate.

[0015] Preferably, the lifting mechanism is optimized to better suit water operations in conjunction with the float: the lifting mechanism includes columns, connecting beams, and lifting beams, with lifting components mounted on the lifting beams; the columns are located at both ends of the float in the length and width directions, and the connecting beams are located at the top of the columns, connecting the columns to each other along the length and width directions of the float; the connecting beams are a longitudinal beam parallel to the length direction of the float and a transverse beam parallel to the width direction of the float, the lifting beams are parallel to the transverse beams, a linear transmission component is mounted on the longitudinal beams, and the lifting beams are mounted on the moving end of the linear transmission component.

[0016] To solve the above-mentioned technical problems, the second technical solution of the present invention is a method for using a gantry crane for dock operations, applying the crane described in the first technical solution. The method includes an operation method and a cleaning method; the operation method is as follows:

[0017] S1. Adjust the crane status by adjusting the baffle in the water tank to the working state and connecting the reversing valve to the water inlet module and the inside of the water tank.

[0018] S2. During movement, water in the storage tank is discharged through the water outlet module to improve the center of gravity of the float, so as to facilitate the movement and transfer of the crane;

[0019] S3. Place the float perpendicular to the shore along its length, with the end of the float facing the shore to form a double-sided dock;

[0020] S4. During operation, water is drawn from the natural environment through the water inlet module to lower the center of gravity of the float, thereby ensuring the stability of the crane during water operations.

[0021] Preferably, the cleaning method is as follows:

[0022] S1. Empty the water in the water storage tank through the water outlet module;

[0023] S2. Adjust the crane status by adjusting the baffle in the water storage tank to the cleaning state and connecting the reversing valve to the water inlet module and the cleaning module.

[0024] S3. During cleaning, the water inlet module connects to the city's water supply system to provide water to the cleaning module, allowing the spray heads to spray and clean the water storage tank and partitions. At the same time, the water outlet module continuously empties the water in the water storage tank.

[0025] The main technical effects of this invention are reflected in the following aspects:

[0026] Traditional dock cranes are mostly fixed and installed at the edge of the dock, with limited mobility, unable to quickly respond to the needs of different berths, and have high construction and maintenance costs. The gantry crane of this invention adopts a floating design, which can move freely to different locations in the port, not only reducing dependence on specific berths but also improving operational efficiency. At the same time, the floating design also allows the crane to work in a wider range of water environments, enhancing the adaptability and flexibility of the equipment.

[0027] By adjusting the center of gravity of the buoy through a water tank, this invention can effectively cope with changes in the marine operating environment. In operational mode, increasing the water volume in the tank lowers the buoy's center of gravity, enhancing stability; in mobile mode, decreasing the water volume raises the buoy's center of gravity, facilitating rapid movement. This dynamic adjustment mechanism significantly improves equipment safety and operational efficiency.

[0028] Equipping the water storage tank with a cleaning module allows for convenient cleaning of the tank and its internal partitions, ensuring long-term stable operation of the equipment. By switching the function of the water inlet module through a reversing valve, the water in the storage tank can be replenished during operation, or the system can be connected to the city's water supply system during cleaning, thus achieving effective utilization of water resources. Attached Figure Description

[0029] Figure 1 This is a structural diagram of the present invention;

[0030] Figure 2 for Figure 1 Structural diagram of the lifting mechanism;

[0031] Figure 3 for Figure 1 Structural diagram of the mid-floating body;

[0032] Figure 4 for Figure 2 A partial sectional view of the mid-floating body;

[0033] Figure 5 for Figure 2 Side sectional view of the mid-float body;

[0034] Figure 6 for Figure 5 A schematic diagram of the internal bulkhead of the intermediate water storage tank in operation;

[0035] Figure 7 for Figure 5 A schematic diagram showing the internal partitions of the central water storage tank in the cleaning state;

[0036] In the diagram: 1. Lifting mechanism, 11. Column, 12. Connecting beam, 13. Lifting beam, 14. Longitudinal beam, 15. Crossbeam; 2. Float, 21. Working area, 22. Guide plate, 23. Buffer plate, 24. Telescopic cavity, 25. Return spring, 26. Buffer cavity; 3. Water storage tank, 31. Baffle, 32. Through hole, 33. Plate, 34. Rotating rod, 35. Connecting rod, 36. Control rod. Detailed Implementation

[0037] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and mastered.

[0038] In this embodiment, it should be understood that the terms "middle," "upper," "lower," "top," "right side," "left end," "above," "back," "center," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0039] Furthermore, unless otherwise specified in this specific embodiment, the connection or fixing method between components can be achieved by bolt fixing, pin fixing, or pin connection commonly used in the prior art. Therefore, it will not be described in detail in this embodiment.

[0040] Example 1

[0041] See Figure 1 A gantry crane is used for dock operations. The crane includes a lifting mechanism 1, which is used for lifting operations at the dock, including loading, unloading, and handling of goods. A float 2 is used to install and support the lifting mechanism 1 for operations on the water. The middle area of ​​the float 2 is hollow, providing a working area 21 for the lifting mechanism 1 on the water. The float 2 has a water tank 3. By controlling the amount of water stored in the water tank 3, the center of gravity of the float 2 can be changed, thereby ensuring stability during operation and flexibility during movement.

[0042] Specifically, when the water level in the storage tank 3 increases, the center of gravity of the float 2 decreases to ensure the stability of the crane during water operations, especially in conditions of strong winds and waves. When the water level in the storage tank 3 decreases, the center of gravity of the float 2 shifts to facilitate the movement and relocation of the crane, reducing resistance and energy consumption during movement. Traditional dock cranes are mostly fixed, installed at the edge of the dock, with limited mobility, unable to quickly respond to the needs of different berths, and have high construction and maintenance costs. The crane in this embodiment adopts a float 2 design, which can move freely to different locations in the port, reducing dependence on specific berths and improving operational efficiency. The float 2 design also allows the crane to work in a wider range of aquatic environments, enhancing the adaptability and flexibility of the equipment. At the same time, fixed cranes lack an effective center of gravity adjustment mechanism, which may pose safety hazards in the event of severe weather, such as strong winds or waves. However, this embodiment adjusts the center of gravity of the float 2 through the storage tank 3, effectively coping with changes in the marine operating environment. In operational mode, increasing the water level in tank 3 lowers the center of gravity of buoy 2, enhancing stability; in mobile mode, decreasing the water level raises the center of gravity of buoy 2, facilitating rapid movement. This dynamic adjustment mechanism significantly improves equipment safety and operational efficiency.

[0043] See Figure 5The water storage tank 3 is equipped with a baffle 31, which divides the water storage tank 3 into several water storage chambers. This reduces the impact of water level fluctuations in the water storage tank 3 on the center of gravity of the float 2, ensuring the stability and balance of the float 2. The baffle 31 has through holes 32 extending through both sides, connecting the several water storage chambers to ensure that water can flow between different chambers within the water storage tank 3, preventing the center of gravity of the float 2 from shifting and causing the crane to tip over. Specifically, the design of the baffle 31 and through holes 32 effectively reduces water level fluctuations within the water storage tank 3, ensuring the stability and balance of the float 2 under various operating environments; the through holes 32 allow for water flow communication between the water storage chambers, preventing the center of gravity of the float 2 from shifting and avoiding crane tipping accidents.

[0044] See Figure 3 , Figure 4 The floating body 2 has a flow guide plate 22 and a buffer plate 23 at both ends along its length. The two ends of the floating body 2 are the near end and the far end, respectively, based on their distance from the shore. The flow guide plate 22 is located at the far end of the floating body 2 and is typically streamlined or wedge-shaped to mitigate the impact of the water flow on the floating body 2, reduce the direct force of the water flow on the floating body 2, and protect the structure of the floating body 2 and the crane. The buffer plate 23 is located at the near end of the floating body 2 to mitigate collisions between the crane and the shore, protecting not only the crane itself but also providing additional safety for surrounding facilities.

[0045] The guide plate 22 is fixedly installed on the far end of the float 2; a telescopic cavity 24 is opened on the near end of the float 2, and a buffer plate 23 is slidably installed on the port of the telescopic cavity 24. A return spring 25 is also provided between the buffer plate 23 and the telescopic cavity 24; a buffer cavity 26 is above the telescopic cavity 24, and the buffer cavity 26 is connected to the telescopic cavity 24. The telescopic cavity 24 is filled with liquid. The dual buffering mechanism of the return spring 25 and the buffer liquid ensures the reliability and recovery ability of the buffer plate 23 after multiple impacts.

[0046] The water storage tank 3 is equipped with an inlet module and an outlet module, which control the water volume within the tank. The inlet module includes a water pump, pipes, and control valves. The water pump can draw water from the natural environment (such as seawater) and deliver it to the water storage tank 3 through the pipes. The outlet module includes a drain pump, pipes, and control valves. The drain pump can discharge the water in the water storage tank 3 to the outside through the pipes. During operation, the inlet module increases the water volume in the water storage tank 3 by drawing water from the natural environment during water operations; the outlet module decreases the water volume in the water storage tank 3 by draining water from it. The water storage tank 3 is also equipped with a cleaning module, which includes spray heads that can comprehensively cover the surfaces of the water storage tank 3 and the partition 31. The spray head is used to clean the water storage tank 3 and the partition 31. During cleaning, the water inlet module connects to the municipal water system to provide water to the cleaning module. A reversing valve is installed between the water inlet module, the cleaning module, and the water storage tank 3. During operation, the reversing valve connects the water inlet module and the interior of the water storage tank 3 to increase the water volume in the tank. During cleaning, the reversing valve connects the water inlet module and the cleaning module to provide water to the cleaning module. The cleaning module can easily clean the water storage tank 3 and its internal partition 31, ensuring the long-term stable operation of the equipment. By switching the function of the water inlet module through the reversing valve, water can be added to the water storage tank 3 during operation or connected to the municipal water system during cleaning, achieving effective utilization of water resources. A level sensor can also be installed inside the water storage tank 3 to monitor the water level in real time, ensuring that the water volume in the tank remains within a safe range.

[0047] Specifically, the water volume in the water storage tank 3 is adjusted by the water inlet module and the water outlet module to ensure stability and safety during operation; the cleaning module can easily clean the water storage tank 3 and the internal partition 31 to prevent seawater from corroding the equipment and ensure long-term stable operation of the equipment; by switching the function of the water inlet module through the reversing valve, the water volume in the water storage tank 3 can be replenished during operation, and the water can be connected to the urban water system during cleaning, thus realizing the effective utilization of water resources.

[0048] See Figure 6 , Figure 7 The baffle 31 is rotatably installed inside the water storage tank 3, and can switch between operating and cleaning states. The baffles 31 within the water storage tank 3 are spaced apart along its length. When the baffle 31 is in operating mode, its plane is parallel to the width of the water storage tank 3, dividing it into multiple water chambers, reducing liquid level fluctuations, and ensuring the stability and balance of the float 2. When the baffle 31 is in cleaning mode, its plane is parallel to the length of the water storage tank 3, and all baffles 31 are on the same plane, facilitating thorough cleaning of the water storage tank 3 and the baffles 31 by the cleaning module. An inlet / outlet can also be provided at the top of the water storage tank 3 to simplify cleaning and maintenance.

[0049] The partition 31 includes a plate 33 and a rotating rod 34 that drives the plate 33 to rotate. One end of the rotating rod 34 is fixedly connected to a connecting rod 35. The connecting rods 35 are arranged in parallel and are rotatably connected to the control rods 36. The movement of the control rods 36 causes the connecting rods 35 to swing, thereby driving the partition 31 to rotate.

[0050] See Figure 2 The lifting mechanism 1 includes a column 11, a connecting beam 12, and a lifting beam 13. A lifting assembly, which can be a chain hoist, is mounted on the lifting beam 13. The column 11 is located at both ends of the float 2 along its length and width. The connecting beam 12 is located at the top of the column 11 and is used to connect the columns 11 in pairs along the length and width of the float 2. The connecting beams 12 consist of a longitudinal beam 14 parallel to the length of the float 2 and a transverse beam 15 parallel to the width of the float 2. The lifting beam 13 is parallel to the transverse beam 15. A linear transmission assembly is mounted on the longitudinal beam 14, and the lifting beam 13 is located on the moving end of the linear transmission assembly. Furthermore, the column 11 can be a lifting column 11, which can adjust its height according to operational needs, adapting to different types of vessels and operational environments, thus improving operational flexibility and adaptability. Simultaneously, the lifting design can effectively cope with changes in the marine operational environment.

[0051] Specifically, during operation, only the lifting beam 13 and the lifting components move in the lifting mechanism 1 of this embodiment, avoiding the problems caused by the entire column 11 and the lifting beam 13 moving on the slide rail in the traditional design; reducing the weight of movement, improving the movement efficiency and safety, and reducing energy consumption and maintenance costs.

[0052] Example 2

[0053] The method of using a gantry crane for dock operations, using the crane in Example 1, includes the operation method and the cleaning method.

[0054] The instructions for using the assignment are as follows:

[0055] S1, see also Figure 6 The crane is adjusted to operate by adjusting the partition 31 inside the water storage tank 3 to ensure that the plane of the partition 31 is parallel to the width direction of the water storage tank 3, thus dividing the water storage tank 3 into multiple water storage chambers; at the same time, the reversing valve is connected to the water inlet module and the inside of the water storage tank 3 to prepare for water filling.

[0056] S2. When moving, the water in the water storage tank 3 is discharged through the water outlet module, reducing the water volume in the water storage tank 3 and increasing the center of gravity of the float 2 to facilitate the movement and transfer of the crane, thereby reducing resistance and energy consumption during the movement process.

[0057] S3. Place the float 2 perpendicular to the shore along its length, with the end of the float 2 facing the shore to form a double-sided dock. This layout facilitates the berthing of ships and the loading and unloading of cargo.

[0058] S4. During operation, water is drawn from the natural environment through the water inlet module to lower the center of gravity of the float 2, thereby ensuring the stability of the crane during water operations; especially in the case of large winds and waves, a low center of gravity can improve the safety of the operation.

[0059] The cleaning and usage instructions are as follows:

[0060] S1. The water in the water storage tank 3 is drained through the water outlet module to facilitate subsequent cleaning work.

[0061] S2, see also Figure 7 The crane is adjusted to put the baffles 31 in the water storage tank 3 into the cleaning state, ensuring that the plane of the baffles 31 is parallel to the length of the water storage tank 3 and that all baffles 31 are on the same plane, so that the cleaning module can thoroughly clean the water storage tank 3 and the baffles 31; at the same time, the reversing valve is connected to the water inlet module and the cleaning module to prepare for cleaning.

[0062] S3. During cleaning, the water inlet module connects to the city's water supply system to provide water to the cleaning module. The cleaning module is then activated, allowing the spray heads to spray and clean the water storage tank 3 and the partition 31. At the same time, the water outlet module continuously drains the water from the water storage tank 3 to ensure that the cleaning water is discharged in a timely manner and to keep the inside of the water storage tank 3 clean.

[0063] Furthermore, as is common knowledge in this industry, the urban water system, level sensor, and sprinkler head mentioned earlier are all common knowledge; therefore, their principles and structures will not be elaborated upon further.

[0064] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A gantry crane for dock operations, characterized in that, The crane includes: A lifting mechanism is provided for lifting operations at the dock. A floating body is provided for mounting and supporting the lifting mechanism during water operations. The floating body has a hollow central area to provide a working area for the lifting mechanism. The floating body has a water storage tank, and the center of gravity of the floating body is changed by controlling the amount of water stored in the tank. When the amount of water in the tank increases, the center of gravity of the floating body decreases to ensure the stability of the crane during water operations. When the amount of water in the tank decreases, the center of gravity of the floating body shifts to facilitate the movement and relocation of the crane. The water storage tank is equipped with a partition, which divides the water storage tank into several water storage chambers, thereby reducing the change in the center of gravity of the floating body caused by the fluctuation of the water level in the water storage tank, and ensuring the stability and balance of the floating body; the partition has through holes on both sides, which connect the several water storage chambers to each other, preventing the center of gravity of the floating body from shifting, which could cause the crane to tip over; The water storage tank is equipped with an inlet module and an outlet module, which control the water volume within the tank. During operation, the inlet module increases the water volume by drawing water from the natural environment. The outlet module decreases the water volume by discharging water from the tank. The tank also includes a cleaning module with spray nozzles for cleaning the tank and its partitions. During cleaning, the inlet module connects to the city's water supply system to provide water. A reversing valve connects the inlet module, the cleaning module, and the tank. During operation, the reversing valve connects the inlet module and the tank to increase the water volume. During cleaning, the valve connects the inlet module and the cleaning module to provide water. The partition is rotatably installed inside the water storage tank, and the partition can switch between working state and cleaning state; the partitions inside the water storage tank are spaced apart along the length of the water storage tank; when the partition is in the working state, the plane of the partition is parallel to the width direction of the water storage tank; when the partition is in the cleaning state, the plane of the partition is parallel to the length direction of the water storage tank, and all the partitions are on the same plane; The partition includes a plate and a rotating rod that drives the plate to rotate. One end of the rotating rod is fixedly connected to a connecting rod. The connecting rods are arranged in parallel and are rotatably connected to a control rod. The movement of the control rod causes the connecting rod to swing, thereby driving the partition to rotate.

2. The gantry crane for dock operations as described in claim 1, characterized in that: The float is provided with a flow guide plate and a buffer plate at both ends in the length direction, and the two ends in the length direction are the near end and the far end according to their distance from the shore. The guide plate is located on the far end of the float to mitigate the impact of the water flow on the float; The buffer plate is located near the end of the float to mitigate collisions between the crane and the shore.

3. The gantry crane for dock operations as described in claim 2, characterized in that: The guide plate is fixedly installed on the far end of the float; A telescopic cavity is provided near the end of the float, and a buffer plate is slidably installed on the port of the telescopic cavity. A return spring is also provided between the buffer plate and the telescopic cavity. A buffer cavity is provided above the telescopic cavity, and the buffer cavity and the telescopic cavity are connected. The telescopic cavity is filled with liquid.

4. The gantry crane for dock operations as described in claim 1, characterized in that: The lifting mechanism includes a column, a connecting beam, and a lifting beam, and the lifting beam is equipped with lifting components. The uprights are located at both ends of the float in the length and width directions, and the connecting beams are located at the top of the uprights. The connecting beams are used to connect the uprights in pairs along the length and width directions of the float. The connecting beams are a longitudinal beam parallel to the length direction of the float and a transverse beam parallel to the width direction of the float. The lifting beam is parallel to the transverse beam. A linear transmission assembly is provided on the longitudinal beam, and the lifting beam is located on the moving end of the linear transmission assembly.

5. The method of using a gantry crane for dock operations, characterized in that: The crane according to any one of claims 1 to 4, wherein the method of use includes an operational method and a cleaning method; the operational method is as follows: S1. Adjust the crane status by adjusting the baffle in the water tank to the working state and connecting the reversing valve to the water inlet module and the inside of the water tank. S2. During movement, water in the storage tank is discharged through the water outlet module to improve the center of gravity of the float, so as to facilitate the movement and transfer of the crane; S3. Place the float perpendicular to the shore along its length, with the end of the float facing the shore to form a double-sided dock; S4. During operation, water is drawn from the natural environment through the water inlet module to lower the center of gravity of the float, thereby ensuring the stability of the crane during water operations.

6. The method of using a gantry crane for dock operations as described in claim 5, characterized in that: The cleaning method is as follows: S1. Empty the water in the water storage tank through the water outlet module; S2. Adjust the crane status by adjusting the baffle in the water storage tank to the cleaning state and connecting the reversing valve to the water inlet module and the cleaning module. S3. During cleaning, the water inlet module connects to the city's water supply system to provide water to the cleaning module, allowing the spray heads to spray and clean the water storage tank and partitions. At the same time, the water outlet module continuously empties the water in the water storage tank.

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