Height-size-variable ship crane

Abstract

The utility model relates to a ship crane with a variable height size. Comprising a fixed stand column fixedly installed on a ship deck, an in-cabin base is arranged below the ship deck, and a jacking hydraulic cylinder is installed on the in-cabin base; a first-stage lifting stand column is arranged in the fixed stand column, the lower end of the first-stage lifting stand column penetrates out of the bottom of the fixed stand column and is connected with a piston rod of a jacking hydraulic cylinder, a second-stage lifting stand column is arranged above the first-stage lifting stand column, a driving box is arranged between the second-stage lifting stand column and the first-stage lifting stand column, and an inner stand column is arranged in the second-stage lifting stand column. A lifting driving assembly for driving the inner stand column to do lifting movement is installed on the driving box, a locking device for locking the inner stand column is installed on the side wall of the upper portion of the second-stage lifting stand column, and a hoisting assembly is installed on the side portion of the upper portion of the inner stand column. The utility model provides the ship crane with the variable height size, the ship crane has the controllable lifting capacity, the height of the crane is obviously reduced through lifting control during bridge crossing, the height limiting requirement of ship bridge crossing is met, the bridge crossing efficiency is improved, and the ship crane can be quickly recovered to the original shape after bridge crossing.

Description

Technical Field

[0001] The utility model belongs to the technical field of ship implementation, and in particular relates to a ship crane with variable height and size. Background Art

[0002] As a typical dredging construction vessel, the cutter suction dredger is widely used in modern dredging construction projects and plays a decisive role in the quality of the project. Dredging scenarios include but are not limited to rivers and ports, so the cutter suction dredger has the scene of crossing bridges. Crossing a bridge refers to the activity of the cutter suction dredger passing under the bridge in the river or port to reach the construction waters. Since the cutter suction dredger is usually a large ship, strict bridge crossing procedures should be followed when crossing the bridge and auxiliary ships such as anchor boats should be deployed when necessary to avoid collisions with bridge piers and bridge bodies when crossing the bridge to ensure the safety of the bridge. On the other hand, as a large construction ship, the cutter suction dredger is usually tall, and when crossing the bridge, it is also necessary to pay attention to the height limit of the bridge to avoid direct collisions between the ship's facilities and the bridge body during the crossing process.

[0003] Cutter suction dredgers typically require a ship crane, primarily used for transferring materials onboard. The crane is a significant factor influencing the overall height of the vessel. Controlling the height of the dredger to meet height restrictions when crossing bridges is a crucial consideration within the industry. If the construction vessel cannot successfully cross the bridge to reach the construction area, the project cannot proceed. Therefore, controlling the height of the crane is essential. In the prior art, when a vessel is crossing a bridge and the crane cannot meet the height restrictions, the crane is typically disassembled and laid flat. For cranes that cannot be disassembled and laid flat, they are temporarily removed by cutting and then restored to their original state after crossing the bridge. This approach is not only inefficient and impacts the vessel's construction schedule, but also negatively impacts the crane's strength. Furthermore, cutting and then welding the crane back together makes it difficult to restore the crane to its original state. Furthermore, the vessel must return to port after construction, requiring further disassembly, cutting, and restoration, which is unacceptable both in terms of construction time and the vessel itself.

[0004] In summary, it is necessary to optimize the structure of the crane facilities configured for the cutter suction dredge to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a ship crane with variable height and size, which has the ability of controllable lifting. When crossing a bridge, the height of the crane can be significantly lowered through lifting control, meeting the height limit requirements of ships crossing bridges, improving the efficiency of crossing bridges, and being able to quickly return to its original state after crossing the bridge.

[0006] The technical solution adopted by the utility model is: a ship crane with variable height and size, comprising a fixed column installed on the ship deck, an in-cabin base is provided below the ship deck and a lifting hydraulic cylinder is installed on the in-cabin base; a first-level lifting column is provided inside the fixed column, the lower end of the first-level lifting column passes through the bottom of the fixed column and is connected to the piston rod of the lifting hydraulic cylinder, a second-level lifting column is provided above the first-level lifting column and a drive box is provided between the two, an internal column is provided inside the second-level lifting column, a lifting drive assembly for driving the internal column to move up and down is installed on the drive box, a locker for locking the internal column is installed on the upper side wall of the second-level lifting column, and a lifting assembly is installed on the upper side of the internal column.

[0007] Preferably, the inner wall of the fixed column is stepped, the drive box is in the shape of a flat cylinder, and its outer diameter is equal to the lower inner diameter of the fixed column. The outer diameter of the first-level lifting column is equal to the lower inner diameter of the fixed column, and the outer diameter of the second-level lifting column is equal to the upper inner diameter of the fixed column.

[0008] Preferably, the lifting drive assembly includes two driving gears that are installed in a driving box and mesh with each other. A driving motor that drives one of the driving gears to rotate is provided below the driving box. It also includes two threaded rods whose lower ends are fixedly connected to the two driving gears respectively, and a driving base plate with two driving connecting seats. The driving connecting seat has an internal threaded hole and the threaded rod is located in the internal threaded hole. The driving base plate is fixedly connected to the lower end of the internal column.

[0009] Preferably, the lock is a manual lock, comprising a sleeve with an internal thread fixedly connected to the outer wall of the secondary lifting column, a locking rod with an external thread provided inside the sleeve, a rotating end provided at the outer end of the locking rod and a locking cone provided at the inner end, and the locking cone is inserted into a lock hole provided on the side wall of the inner column.

[0010] Preferably, the locker is a locking hydraulic cylinder, the cylinder body of which is mounted and fixed on the outer wall of the secondary lifting column, and the end of its piston rod is provided with a locking cone, which is inserted into a lock hole provided on the side wall of the inner column.

[0011] Preferably, the lifting assembly includes a boom that can swing laterally, a transverse movement assembly is installed on the boom, an electric hoist is provided below the transverse movement assembly, and a hook is provided at the lower end of the lifting cable retracted and released by the electric hoist.

[0012] Preferably, a vertical core shaft is installed on the upper part of the internal column using upper and lower shaft seats, a shaft sleeve is provided on the core shaft, and the rear end of the boom is fixedly connected to the shaft sleeve.

[0013] Preferably, a bottom reinforcement connecting plate is welded and installed between the lower portion of the fixed column and the ship deck, and a top reinforcement connecting plate is welded and installed between the rear end of the boom and the shaft sleeve.

[0014] Preferably, limit blocks for limiting the transverse movement assembly are installed at the front and rear ends of the boom.

[0015] The advantages and positive effects of the utility model are:

[0016] The present invention provides a ship crane with a reasonable structural design and variable height and size. Compared with existing fixed ship cranes, the ship crane in the present invention has a lifting hydraulic cylinder installed at the bottom, so that the main part of the crane can be raised and lowered as needed. By arranging a drive box and a lifting drive assembly inside, the height of the internal column can be raised and lowered as needed. Therefore, the ship crane has the ability of controllable lifting and lowering, and when crossing a bridge, the height limit requirement of the bridge can be met by lowering the height of the ship crane.

[0017] Compared with the existing fixed ship crane, the ship crane in the utility model can quickly and conveniently lower the height of the crane to meet the height limit requirements when necessary without changing the crane structure. After crossing the bridge, the ship crane can be quickly restored to its original state through convenient operation. Therefore, it can not only improve the efficiency of crossing the bridge and the construction efficiency of the suction dredger, but also will not affect the structural strength of the ship crane during multiple raising and lowering of the height. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main perspective structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the main perspective structure of the main part of the utility model;

[0020] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle lifting drive assembly and internal columns;

[0021] Figure 4 yes Figure 2 Schematic diagram of the structure of the lifting drive component.

[0022] In the picture:

[0023] 1. Lifting hydraulic cylinder; 2. Cabin base; 3. Ship deck; 4. Bottom reinforcement connecting plate; 5. First-level lifting column; 6. Lifting drive assembly; 6-1. Drive motor; 6-2. Drive gear; 6-3. Drive base plate; 6-4. Drive connector; 6-5. Threaded rod; 7. Drive box; 8. Fixed column; 9. Second-level lifting column; 10. Lock; 11. Bushing; 12. Internal column; 13. Shaft seat; 14. Top reinforcement connecting plate; 15. Limit block; 16. Boom; 17. Transverse movement assembly; 18. Electric hoist; 19. Lifting cable; 20. Hook; 21. Core shaft. DETAILED DESCRIPTION

[0024] In order to further understand the content, features and effects of the present invention, the following embodiments are given to illustrate in detail.

[0025] See Figure 1 and Figure 2 The height-adjustable ship crane of the present invention comprises a fixed column 8 mounted on a ship deck 3. Below the ship deck 3, an inboard base 2 is provided, on which a lifting hydraulic cylinder 1 is mounted. As the foundation of the ship crane, the fixed column 8 must possess sufficient structural strength. The lifting hydraulic cylinder 1 is used to provide hydraulic lifting control for the ship crane, raising or lowering the height of the crane's main body. To ensure overall structural strength, in this embodiment, a bottom reinforcement connecting plate 4 is welded between the lower portion of the fixed column 8 and the ship deck 3.

[0026] A first-stage lifting column 5 is provided inside the fixed column 8. The lower end of the first-stage lifting column 5 extends through the bottom of the fixed column 8 and is connected to the piston rod of the lifting hydraulic cylinder 1. A second-stage lifting column 9 is provided above the first-stage lifting column 5, and a drive box 7 is provided between the two. Specifically, the upper end of the first-stage lifting column 5 is welded to the bottom of the drive box 7, and the lower end of the second-stage lifting column 9 is welded to the top of the drive box 7. An internal column 12 is provided inside the second-stage lifting column 9, and a lifting drive assembly 6 is mounted on the drive box 7 to drive the internal column 12 to move up and down.

[0027] As shown in the figure, the first-stage lifting column 5, the drive box 7 and the second-stage lifting column 9 form a rigid whole. They are synchronously lifted and lowered by the driving action of the jacking hydraulic cylinder 1. The lifting drive assembly 6 independently drives the internal column 12 to lift and lower. Therefore, the ship crane in the utility model has two height adjustment operations, which can be selectively operated according to the site conditions.

[0028] In this embodiment, the inner wall of the fixed column 8 is stepped, with the inner diameter of the upper portion being smaller than that of the lower portion. The drive box 7 is an oblate cylinder with an outer diameter equal to the lower inner diameter of the fixed column 8. The outer diameter of the primary lifting column 5 is equal to the lower inner diameter of the fixed column 8, and the outer diameter of the secondary lifting column 9 is equal to the upper inner diameter of the fixed column 8. Thus, driven by the lifting hydraulic cylinder 1, the primary lifting column 5, drive box 7, and secondary lifting column 9 form a rigid unit capable of stable lifting and lowering movement within the interior of the fixed column 8.

[0029] See Figure 3 and Figure 4 , we can see that:

[0030] The lifting drive assembly 6 includes two meshing drive gears 6-2 mounted within a drive housing 7. A drive motor 6-1 is located below the drive housing 7 to rotate one of the drive gears 6-2. It also includes two threaded rods 6-5, each fixedly connected at its lower end to the two drive gears 6-2, and a drive base plate 6-3 with two drive connectors 6-4. The drive connectors 6-4 have internally threaded holes in which the threaded rods 6-5 are positioned. The drive base plate 6-3 is fixedly connected to the lower end of the internal column 12.

[0031] The driving motor 6-1 drives the two driving gears 6-2 to rotate synchronously, and the two threaded rods 6-5 rotate synchronously. Due to the cooperation between the threaded rods 6-5 and the driving connecting seat 6-4, the driving base plate 6-3 rises or falls, and the internal column 12 rises or falls accordingly.

[0032] Considering that the ship crane is in a working state capable of carrying objects when it is raised to a high position, locking the internal column 12 will help maintain the high position and ensure the structural strength and stability of the crane during operation. In this embodiment, a locker 10 for locking the internal column 12 is installed on the upper side wall of the secondary lifting column 9. After the height adjustment is completed, the locker 10 is used to lock the internal column 12 and the secondary lifting column 9 into one. When the height adjustment is required, the locker 10 needs to be operated to disconnect the internal column 12 from the secondary lifting column 9.

[0033] The lock 10 can be selected as a manual type or a hydraulic type, and one of the specific types is selected according to the site conditions:

[0034] In the first form, the locker 10 is a manual locker, which includes a sleeve with an internal thread fixedly connected to the outer wall of the secondary lifting column 9, a locking rod with an external thread is provided inside the sleeve, a rotating end is provided at the outer end of the locking rod, and a locking cone is provided at the inner end. The locking cone is inserted into a lock hole provided on the side wall of the internal column 12.

[0035] In the second form, the locker 10 is a locking hydraulic cylinder, the cylinder body of which is mounted and fixed on the outer wall of the secondary lifting column 9, and the end of its piston rod is provided with a locking cone, which is inserted into a lock hole provided on the side wall of the inner column 12.

[0036] A lifting assembly is installed on the upper side of the inner column 12. Figure 1 As shown in FIG, the lifting assembly includes a boom 16 that can swing laterally, a traverse assembly 17 mounted on the boom 16, an electric hoist 18 disposed below the traverse assembly 17, and a hook 20 disposed at the lower end of a hoist cable 19 that is retracted and extended by the electric hoist 18. The purpose of the traverse swing of the boom 16 is to enable the boom 16 and its accessory components (traverse assembly 17, electric hoist 18, hoist cable 19, and hook 20) ​​to swing by lateral traction when lifting and lowering materials, thereby achieving the displacement of the materials.

[0037] In this embodiment, a vertical core shaft 21 is mounted on the upper portion of the internal column 12 using two upper and lower shaft seats 13. A shaft sleeve 11 is provided on the core shaft 21, and the rear end of the boom 16 is fixedly connected to the shaft sleeve 11. To increase structural strength, in this embodiment, a top reinforcing connecting plate 14 is welded and installed between the rear end of the boom 16 and the shaft sleeve 11.

[0038] In this embodiment, limit blocks 15 are installed at the front and rear ends of the boom 16 to limit the transverse movement assembly 17 and prevent the transverse movement assembly 17 from moving beyond the range.

[0039] Operation method:

[0040] Before a cutter suction dredger passes a bridge, the dimensional relationship between the ship crane height and the bridge height limit is evaluated, and corresponding height lowering measures are adopted. In the first step, the jacking hydraulic cylinder 1 is operated to lower the main part of the ship crane to a low position. At this time, the height of the ship crane is lowered. If the height limit requirement is met at this time, there is no need to operate the lifting drive assembly 6. If the height limit requirement is still not met at this time, the second step is initiated, which is to lower the height of the internal column 12 by operating the lifting drive assembly 6.

[0041] After completing the bridge crossing, the ship crane is restored to its original state. First, the lifting drive assembly 6 is operated to raise the internal column 12 to the high position, and then the locker 10 is used to lock the internal column 12 and the secondary lifting column 9 into one. Then, the jacking hydraulic cylinder 1 is operated to lift the main part of the ship crane to the high position.

Claims

1. A ship crane with variable height and size, characterized by: The invention comprises a fixed column (8) installed on a ship deck (3); an in-cabin base (2) is provided below the ship deck (3) and a lifting hydraulic cylinder (1) is installed on the in-cabin base (2); a first-level lifting column (5) is provided inside the fixed column (8); the lower end of the first-level lifting column (5) passes through the bottom of the fixed column (8) and is connected to the piston rod of the lifting hydraulic cylinder (1); a second-level lifting column (9) is provided above the first-level lifting column (5) and a driving box (7) is provided between the two; an internal column (12) is provided inside the second-level lifting column (9); a lifting driving assembly (6) for driving the internal column (12) to move up and down is installed on the driving box (7); a locker (10) for locking the internal column (12) is installed on the upper side wall of the second-level lifting column (9); and a lifting assembly is installed on the upper side of the internal column (12).

2. The height-adjustable ship crane according to claim 1, wherein: The inner wall of the fixed column (8) is stepped, the driving box (7) is in the shape of a flat cylinder, the outer diameter of which is equal to the inner diameter of the lower part of the fixed column (8), the outer diameter of the first-level lifting column (5) is equal to the inner diameter of the lower part of the fixed column (8), and the outer diameter of the second-level lifting column (9) is equal to the inner diameter of the upper part of the fixed column (8).

3. The height-adjustable ship crane according to claim 2, characterized in that: The lifting drive assembly (6) includes two driving gears (6-2) installed in a driving box (7) and meshing with each other for transmission. A driving motor (6-1) for driving one of the driving gears (6-2) to rotate is provided below the driving box (7). The lifting drive assembly (6) also includes two threaded rods (6-5) whose lower ends are fixedly connected to the two driving gears (6-2) respectively, and a driving base plate (6-3) with two driving connection seats (6-4). The driving connection seats (6-4) have internal threaded holes and the threaded rods (6-5) are located in the internal threaded holes. The driving base plate (6-3) is fixedly connected to the lower end of the internal column (12).

4. The height-adjustable ship crane according to claim 3, wherein: The locker (10) is a manual locker, comprising a sleeve with an internal thread fixedly connected to the outer wall of the secondary lifting column (9), a locking rod with an external thread provided inside the sleeve, a rotating end provided at the outer end of the locking rod and a locking cone provided at the inner end, and the locking cone is inserted into a lock hole provided on the side wall of the internal column (12).

5. The height-adjustable ship crane according to claim 3, characterized in that: The locker (10) is a locking hydraulic cylinder, the cylinder body of which is fixedly mounted on the outer wall of the secondary lifting column (9), and the end of its piston rod is provided with a locking cone, which is inserted into a lock hole arranged on the side wall of the inner column (12).

6. The height-adjustable ship crane according to claim 4 or 5, characterized in that: The lifting assembly comprises a boom (16) capable of laterally swinging, a traverse assembly (17) being mounted on the boom (16), an electric hoist (8) being arranged below the traverse assembly (17), and a hook (20) being arranged at the lower end of a hoist cable (19) retracted and released by the electric hoist (8).

7. The height-adjustable ship crane according to claim 6, wherein: The upper part of the internal column (12) is provided with a vertical core shaft (21) by adopting two upper and lower shaft seats (13), a shaft sleeve (11) is provided on the core shaft (21), and the rear end of the boom (16) is fixedly connected to the shaft sleeve (11).

8. The height-adjustable ship crane according to claim 7, characterized in that: A bottom reinforcement connecting plate (4) is welded and installed between the lower part of the fixed column (8) and the ship deck (3), and a top reinforcement connecting plate (14) is welded and installed between the rear end of the boom (16) and the shaft sleeve (11).

9. The height-adjustable ship crane according to claim 8, characterized in that: Limiting blocks (15) for limiting the transverse movement assembly (17) are installed at the front and rear ends of the boom (16).

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