Mooring shackle
By using a combination of internal hexagonal screws and limiting grooves in the limiting hole design, along with V-shaped and arc structures, the problem of breakage caused by thread corrosion in existing mooring shackles has been solved, thus improving the connection stability and service life of mooring shackles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGSHU DAZHU ANCHOR & CHAIN ACCESSORIES CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-05-19
AI Technical Summary
Existing mooring shackles may break under sudden loads due to increased rust on the threaded parts caused by sea wind erosion during long-term use, which reduces the stress area of the threads and may affect the safety of the mooring system.
A mooring shackle was designed, which adopts a limiting hole structure combining internal hexagonal screws and limiting grooves. The connection stability and corrosion resistance are enhanced by the threaded connection and the flush design of the limiting block. The V-shaped and arc structure improves the uniformity of force distribution and the anti-loosening effect.
It improves the torque resistance and corrosion resistance of shackles, extends service life, reduces the probability of thread corrosion, enhances connection stability and fatigue resistance, and reduces the risk of accidental slippage.
Smart Images
Figure CN224256884U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mooring shackle technology, and more specifically, to a mooring shackle. Background Technology
[0002] Mooring shackles are high-strength connectors used in ship mooring operations to connect components such as anchor chains, cables, anchors, and mooring bollards. They play a crucial role in transferring loads during ship berthing, anchoring, or towing, and their performance directly affects the safety of the mooring system.
[0003] Currently, mooring shackles mainly consist of a body, pins, and fastening components. The body is an arc-shaped load-bearing structure with pin holes at both ends. The pins pass through the holes to close the openings, forming a ring structure that can connect components such as anchor chains and cables.
[0004] However, existing pins are usually threaded at one end and used with nuts to achieve detachable fixation to the body. However, during long-term use, the threads of the shackle will rust due to the erosion of sea winds, resulting in a reduction in the number of usable threads. This will lead to a reduction in the stress area of the threads, which may cause them to break directly under sudden loads. A mooring shackle is proposed to improve the existing problems. Utility Model Content
[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a mooring shackle.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A mooring shackle includes a shackle assembly, a pin assembly is disposed through the shackle assembly, and a screw is disposed at the middle position between the shackle assembly and the pin assembly.
[0008] The shackle assembly includes a shackle body, on which a first connecting hole and a second connecting hole are symmetrically provided. The shackle body is U-shaped, and the shackle body, the first connecting hole, and the second connecting hole are integrally formed.
[0009] The pin assembly includes a pin body, a limiting block is provided at one end of the pin body, and a fixing block is provided at the other end of the pin body. The pin body, the limiting block, and the fixing block are integrally formed.
[0010] The present invention is further configured such that: both the first connecting hole and the outer side of the fixing block are provided with threads, and the shape of the first connecting hole is adapted to the shape of the fixing block.
[0011] The present invention is further configured such that: a limiting groove is provided on one side of the second connecting hole, and the shape of the limiting groove is adapted to the shape of the limiting block.
[0012] The present invention is further configured such that: both the inner sidewall of the limiting groove and the outer sidewall of the limiting block are provided with placement grooves, and the two sets of placement grooves are combined to form a limiting hole, the shape of the limiting hole being adapted to the shape of the screw.
[0013] By adopting the above technical solution, the screw is a hexagon socket screw. The hexagon socket screw is subjected to force through a hexagonal structure, which has strong torque resistance. With a special wrench, a stable preload can be applied. The recessed design of the slot does not easily accumulate impurities, making it more suitable for high-strength and high-reliability connection scenarios. The installation space for the screw is provided by setting two sets of placement slots to form a limiting hole. The inside of the limiting hole and the outside of the screw are both provided with threads. The screw and the limiting hole can be locked together by the threads. After installation, the screw can be fitted into the limiting hole. The end face of the screw is flush with the end face of the shackle assembly and the pin assembly.
[0014] The present invention is further configured such that: an auxiliary hole is provided at the center of one end of the limiting block, and the auxiliary hole is hexagonal in shape.
[0015] The present invention is further configured such that: the shape of the pin body, the fixing block, and the limiting block are all cylindrical, the diameter of the pin body and the fixing block are the same, and the diameter of the limiting block is larger than the diameter of the pin body.
[0016] The present invention is further configured such that: the inner side of the end of the shackle body away from the first connecting hole is V-shaped, and the outer side of the shackle body is arc-shaped.
[0017] By adopting the above technical solutions, the V-shape of the inner side of the shackle body enhances the fit and stress stability with the connected components. When the shackle body connects to components such as anchor chains and cable rings, the V-shaped inner side can form multi-point contact with the arc-shaped surface of the connected components through the inclined surfaces on both sides, dispersing local pressure and avoiding local wear caused by single-point contact. At the same time, the V-shaped structure can create a certain "locking" effect on the connected components, reducing relative displacement caused by vibration and shaking during operation and preventing accidental slippage of the connected components. Especially when subjected to dynamic loads during mooring operations, this fit design can improve the overall connection stability. Setting the outer side of the shackle body to be arc-shaped can reduce stress concentration and improve the overall load-bearing capacity. The arc transition allows the shackle body to evenly distribute the load across the entire arc-shaped structure when subjected to longitudinal tensile force, avoiding local stress peaks caused by right angle or acute angle designs, thereby reducing the risk of cracking of the shackle body. In addition, the arc-shaped outer side can also reduce the probability of damage when colliding with other objects during operation, and reduce the accumulation of seawater and debris on the surface, indirectly improving corrosion resistance.
[0018] In summary, this application includes at least one of the following beneficial technical effects:
[0019] By setting the limiting block to be fully placed inside the limiting groove, with the limiting block flush with the end face of the limiting groove and the fixing block flush with the end face of the first connecting hole, the flush structure reduces the steps between the pin assembly and the shackle assembly, reducing dead corners for the accumulation of impurities such as seawater, silt, and salt, and facilitating daily cleaning and maintenance; at the same time, the smooth surface can reduce the probability of local electrochemical corrosion of the threads, slow down the corrosion rate of the pin assembly and the shackle assembly, and extend their service life. Attached Figure Description
[0020] Figure 1 This is a structural schematic diagram of a mooring shackle according to the present invention.
[0021] Figure 2 for Figure 1 Front view.
[0022] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure along the middle AA.
[0023] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along the middle BB.
[0024] Figure 5 for Figure 1 A schematic diagram of the explosion structure.
[0025] Explanation of reference numerals in the attached drawings: 1. Shackle assembly; 11. Shackle body; 12. First connecting hole; 13. Placement slot; 14. Second connecting hole; 15. Limiting slot;
[0026] 2. Pin assembly; 21. Pin body; 22. Limiting block; 23. Auxiliary hole; 24. Fixing block;
[0027] 3. Screws. Detailed Implementation
[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0030] Please see Figure 1-5 The present invention provides the following technical solution:
[0031] Example 1, see Figure 1A mooring shackle includes a shackle assembly 1, a pin assembly 2 is disposed through the shackle assembly 1, and a screw 3 is disposed at the middle position between the shackle assembly 1 and the pin assembly 2.
[0032] The pin assembly 2 and screw 3 combine to form a mooring shackle structure, specifically forming a ring structure that can connect components such as anchor chains and cables.
[0033] See Figure 4 and Figure 5 The shackle assembly 1 includes a shackle body 11, on which a first connecting hole 12 and a second connecting hole 14 are symmetrically provided. The shape of the shackle body 11 is U-shaped, and the shackle body 11, the first connecting hole 12, and the second connecting hole 14 are integrally formed.
[0034] See Figure 4 The inner side of the end of the shackle body 11 away from the first connecting hole 12 is set in a V shape, and the outer side of the shackle body 11 is set in an arc shape.
[0035] The pin assembly 2 can pass through and connect the first connecting hole 12 and the second connecting hole 14, forming a closed annular structure.
[0036] By setting the inner side of the shackle body 11 to a V-shape, the fit and stress stability with the connected parts can be enhanced. When the shackle body 11 is connected to components such as anchor chains and cable rings, the inner side of the V-shape can form multiple points of contact with the arc-shaped surface of the connected parts through the inclined surfaces on both sides, dispersing local pressure and avoiding local wear of the connected parts due to single-point contact. At the same time, the V-shaped structure can form a certain "clamping" effect on the connected parts, reducing the relative displacement caused by vibration and shaking during operation, and preventing the connected parts from accidentally slipping off. Especially when mooring operations are subjected to dynamic loads, this fit design can improve the overall connection stability.
[0037] Designing the outer side of the shackle body 11 as an arc can reduce stress concentration and improve the overall load-bearing capacity. The arc transition allows the shackle body 11 to evenly distribute the load across the entire arc structure when subjected to longitudinal tensile force, avoiding local stress peaks caused by right angle or acute angle designs, thereby reducing the risk of cracking of the shackle body 11. In addition, the arc-shaped outer side can also reduce the probability of damage when it collides with other objects during operation, while reducing the accumulation of seawater and debris on the surface, indirectly improving corrosion resistance.
[0038] See Figure 4 and Figure 5 The pin assembly 2 includes a pin body 21, a limiting block 22 is provided at one end of the pin body 21, and a fixing block 24 is provided at the other end of the pin body 21. The pin body 21, the limiting block 22, and the fixing block 24 are integrally formed.
[0039] See Figure 4 and Figure 5 The pin body 21, the fixing block 24, and the limiting block 22 are all cylindrical in shape. The diameter of the pin body 21 and the fixing block 24 are the same, and the diameter of the limiting block 22 is larger than the diameter of the pin body 21.
[0040] See Figure 4 and Figure 5 The outer sides of the first connecting hole 12 and the fixing block 24 are both provided with threads, and the shape of the first connecting hole 12 is adapted to the shape of the fixing block 24.
[0041] In practical applications, the first connecting hole 12 and the fixing block 24 are connected by threads. The threaded engagement converts the rotational motion into axial clamping force through the helix angle, which can make the fixing block 24 fit tightly with the first connecting hole 12, reducing the shaking caused by the gap. Especially when subjected to dynamic loads, the preload can offset some vibration and reduce the risk of loosening of the connection.
[0042] A limiting groove 15 is provided on one side of the second connecting hole 14, and the shape of the limiting groove 15 is adapted to the shape of the limiting block 22.
[0043] See Figure 2 and Figure 3 An auxiliary hole 23 is provided at the center of one end of the limiting block 22, and the auxiliary hole 23 is hexagonal in shape.
[0044] The limiting block 22 can be completely fitted inside the limiting groove 15. Specifically, after the fixing block 24 is tightened with the first connecting hole 12, the limiting block 22 is completely placed inside the limiting groove 15. At this time, the limiting block 22 is flush with the end face of the limiting groove 15, and the fixing block 24 is flush with the end face of the first connecting hole 12. The flush structure reduces the step between the pin assembly 2 and the shackle assembly 1, reduces the dead corners for the accumulation of impurities such as seawater, mud, and salt, and facilitates daily cleaning and maintenance. At the same time, the smooth surface can reduce the probability of local electrochemical corrosion of the threads, slow down the corrosion rate of the pin assembly 2 and the shackle assembly 1, and extend the service life.
[0045] In addition, the flush design can reduce the protruding structure at the end edge of the pin assembly 2, making the surface transition of the shackle assembly 1 smooth. When bearing mooring load, the stress can be uniformly transmitted along the continuous contour of the shackle body 11 and the pin assembly 2, reducing the possibility of local stress concentration caused by protruding parts. If the end of the pin assembly 2 protrudes, it is easy to form a "fulcrum effect" when in contact with other parts or under force, which will aggravate local wear or cracking, thereby improving the fatigue resistance of the overall structure.
[0046] Setting the auxiliary hole 23 to be hexagonal can assist in the installation and removal of the shackle assembly 1 and the pin assembly 2. When the pin assembly 2 and the shackle body 11 become too tight due to long-term use, the pin assembly 2 can be easily rotated by inserting an Allen wrench into the auxiliary hole 23 with the help of leverage, solving the problem that it is difficult to turn by hand or ordinary tools. Especially in emergency maintenance scenarios of mooring operations, it can significantly shorten the installation and removal time.
[0047] In addition, compared to setting a protruding wrench position at the end of the pin assembly 2, the built-in hexagonal hole does not increase the external protrusion of the pin assembly 2, which can avoid accidental loosening or structural damage caused by collision or snagging during operation.
[0048] See Figure 4 and Figure 5 The inner side wall of the limiting groove 15 and the outer side wall of the limiting block 22 are both provided with placement grooves 13. The two sets of placement grooves 13 are combined to form a limiting hole. The shape of the limiting hole is adapted to the shape of the screw 3.
[0049] Among them, screw 3 is a hexagon socket screw 3. The hexagon socket screw 3 is subjected to force through a hexagonal structure, which has strong torque resistance. When used with a special wrench, a stable preload can be applied. In addition, the recessed design of the slot makes it less likely for impurities to accumulate, making it more suitable for high-strength and high-reliability connection scenarios.
[0050] The limiting hole formed by the combination of two sets of placement slots 13 provides installation space for the screw 3. The inside of the limiting hole and the outside of the screw 3 are both provided with threads. The screw 3 and the limiting hole can be locked together by the threads. After installation, the screw 3 can be fitted into the limiting hole. The end face of the screw 3 is flush with the end face of the shackle assembly 1 and the pin assembly 2.
[0051] By setting screw 3, the tightness of the connection between shackle assembly 1 and pin assembly 2 can be further increased, and the anti-loosening effect of shackle assembly 1 can be enhanced.
[0052] Specifically, first, the pin body 21 is inserted into the second connecting hole 14 and the first connecting hole 12. Then, the fixing block 24 is tightened into the first connecting hole 12 using a special hex wrench. Finally, the screw 3 is installed into the two sets of placement slots 13 using a corresponding hex wrench to further lock the shackle assembly 1 and the pin assembly 2.
[0053] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.
Claims
1. A mooring shackle, characterized in that: Includes a shackle assembly (1), on which a pin assembly (2) is provided through, and a screw (3) is provided at the middle position between the shackle assembly (1) and the pin assembly (2). The shackle assembly (1) includes a shackle body (11), on which a first connecting hole (12) and a second connecting hole (14) are symmetrically provided. The shape of the shackle body (11) is U-shaped, and the shackle body (11), the first connecting hole (12), and the second connecting hole (14) are integrally formed. The pin assembly (2) includes a pin body (21), one end of which is provided with a limiting block (22), and the other end of which is provided with a fixing block (24). The pin body (21), the limiting block (22), and the fixing block (24) are integrally formed.
2. A mooring shackle according to claim 1, characterised in that: The first connecting hole (12) and the outer side of the fixing block (24) are both provided with threads, and the shape of the first connecting hole (12) is adapted to the shape of the fixing block (24).
3. A mooring shackle according to claim 1, characterised in that: A limiting groove (15) is provided on one side of the second connecting hole (14), and the shape of the limiting groove (15) is adapted to the shape of the limiting block (22).
4. A mooring shackle according to claim 3, wherein: The inner sidewall of the limiting groove (15) and the outer sidewall of the limiting block (22) are both provided with placement grooves (13). The two sets of placement grooves (13) are combined to form a limiting hole. The shape of the limiting hole is adapted to the shape of the screw (3).
5. A mooring shackle according to claim 4, wherein: An auxiliary hole (23) is provided at the center of one end of the limiting block (22), and the auxiliary hole (23) is hexagonal in shape.
6. A mooring shackle according to claim 1, characterised in that: The pin body (21), the fixing block (24), and the limiting block (22) are all cylindrical in shape. The pin body (21) and the fixing block (24) have the same diameter, and the limiting block (22) has a larger diameter than the pin body (21).
7. A mooring shackle according to claim 1, wherein: The inner side of the end of the shackle body (11) away from the first connecting hole (12) is set in a V shape, and the outer side of the shackle body (11) is set in an arc shape.