A marine crane clamping assembly
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU WEILAN SHIP EQUIPMENT MANUFACTURING CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-06-30
AI Technical Summary
The bolts and nuts of the clamping hooks of marine cranes are prone to corrosion in humid and salt spray environments, making them difficult to disassemble. When heated with an open flame, the flame burns the paint on the boom plate, increasing maintenance costs and affecting the continuity of operations.
A clamping assembly for a marine crane was designed, which uses a heat insulation plate and a heat insulation ring to wrap the nut to prevent the flame from directly contacting the boom plate. The positioning screw and L-shaped plate limit the position of the heat insulation ring, enabling convenient disassembly and assembly. The fasteners are processed by sawing.
It effectively prevents damage to the paint on the outrigger plate, reduces maintenance costs, ensures continuous operation, and avoids the problem of flame burning caused by open flame heating.
Smart Images
Figure CN224429968U_ABST
Abstract
Description
Technical Field
[0001] This utility model is a clamping component for a marine crane, belonging to the field of cranes. Background Technology
[0002] The L-shaped clamping hook exhibits unique engineering application value in marine cranes. Through its right-angled geometric configuration, the hook forms a highly efficient mechanical coupling system with the crane's outrigger plate: its vertical section is rotatably connected to the outrigger plate, while the horizontal section extends as the main load-bearing component beneath the object to be lifted, such as plates. When the crane starts lifting operations, the clamping hook rises synchronously with the outrigger plate. At this time, the weight of the object is transferred through the horizontal section to the connection point between the vertical section and the outrigger plate, forming a natural lever clamping force—the greater the weight of the object, the greater the clamping force exerted by the horizontal section of the hook and the outrigger plate, creating a "gravity-reinforced clamping" mechanism.
[0003] The bolt and nut assembly creates a rotating connection between the vertical part of the clamping hook and the outrigger plate. By inserting the bolt into the shaft holes at different positions on the outrigger plate, the minimum clamping distance between the clamping hook and the outrigger plate can be flexibly adjusted to accommodate plates of different thicknesses. However, the humid and salty environment of ships exposes the bolts and nuts to high humidity, making them highly susceptible to electrochemical corrosion. This can lead to the threads becoming tightly interlocked due to rust, making disassembly difficult. When adjusting the clamping distance or maintaining the clamping hook, operators often resort to the emergency measure of heating the nut with an open flame. While this can create a gap between the nut and bolt through thermal expansion and contraction, the flame directly burns the surface of the outrigger plate, causing the paint to carbonize and peel off. The exposed metal of the damaged outrigger plate is more prone to rust, requiring multiple repair processes such as surface grinding, rust removal, and application of primer and topcoat. This not only increases maintenance costs but may also affect the crane's continuous operation if the repainting is not completely dry. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a clamping component for a marine crane to solve the problems mentioned in the background technology. This utility model prevents the paint on the boom plate from being burned and damaged by the flame during the process of heating the nut with an open flame.
[0005] To achieve the above objectives, this utility model provides the following technical solution: A marine crane clamping assembly includes a lifting lug. A first support plate and a second support plate are rotatably connected to the lower end of the lifting lug via a second bolt and a second nut. Multiple shaft holes are provided on the side of the first support plate facing the second support plate and the side of the second support plate facing the first support plate. A clamping hook with an L-shaped structure is provided between two opposing shaft holes. The end of the first support plate away from the lifting lug and the end of the second support plate away from the lifting lug, together with the clamping hook, form a clamping portion. A first bolt is inserted between the two shaft holes, passing through the clamping hook. A first nut is threaded to one end of the first bolt. A heat insulation plate is provided on the side of the second support plate facing away from the first support plate, with both the first and second bolts passing through the heat insulation plate. A heat insulation ring is provided on the side of the second support plate facing away from the first support plate, connected to the first support plate via a connector. Both the first and second nuts are located inside the heat insulation ring.
[0006] Furthermore, a pressure ring is provided between the first support arm plate and the second support arm plate. The pressure ring is located on the side away from the lifting lug between the first support arm plate and the second support arm plate. A first circular hole is provided at the end of the first support arm plate near the pressure ring and at the end of the second support arm plate near the pressure ring. A third bolt is inserted into the space formed by the two first circular holes. The third bolt passes through the pressure ring. A third nut is threaded to the end of the third bolt near the heat insulation plate. The third nut is located inside the heat insulation ring cover.
[0007] Furthermore, two pads are installed on the side of the heat insulation plate facing the second support plate, and the end of the pad away from the heat insulation plate is in contact with the second support plate.
[0008] Furthermore, the side of the heat insulation plate facing the second support plate is evenly provided with a plurality of through holes that mate with the shaft hole. One end of the first bolt passes through the through hole. The end of the heat insulation plate near the lifting lug is provided with a pin hole. The end of the first support plate near the lifting lug and the end of the second support plate near the second support lug are both provided with a second round hole that mates with the pin hole. The second bolt is inserted into the channel formed by the second round hole and the pin hole.
[0009] Furthermore, the connector includes an L-shaped plate, an L-shaped plate is installed at the middle position of the upper surface of the heat insulation ring cover, the end of the L-shaped plate away from the heat insulation ring cover extends to the side of the first support arm plate opposite to the second support arm plate, and the side of the L-shaped plate facing the first support arm plate is threaded with a positioning screw for limiting the relative position of the L-shaped plate and the first support arm plate.
[0010] Furthermore, an internal threaded sleeve penetrating the L-shaped plate is installed on the side of the L-shaped plate facing the first support arm plate, and one end of the positioning screw is threaded into the internal threaded sleeve.
[0011] Furthermore, a first clamping bar and a second clamping bar are installed on both parallel sides of the clamping hook, and the first clamping bar and the second clamping bar are arranged perpendicular to each other.
[0012] The beneficial effects of this utility model are:
[0013] 1. The heat insulation plate is installed on the side of the second support arm plate, forming a heat barrier with the heat insulation ring cover. The heat insulation ring cover completely encloses the first nut, the second nut, and the third nut. When heated by open flame, the flame only contacts the outer surface of the heat insulation ring cover and the heat insulation plate, preventing the flame from being directly sprayed onto the surface of the second support arm plate. This prevents the paint on the support arm plate from being burned and damaged by the flame during the process of heating the nuts with an open flame, and eliminates the problem of paint carbonization and peeling.
[0014] 2. When assembling components such as lifting lugs and clamping hooks, ensure that the first, second, and third bolts all penetrate the heat insulation plate. This eliminates the need for additional fasteners to restrict the position of the heat insulation plate. Use positioning screws and L-shaped plates to restrict the position of the heat insulation ring cover, enabling convenient assembly and disassembly of the heat insulation ring cover and the heat insulation plate. The heat insulation ring cover can be removed when no open flame is used.
[0015] 3. When assembling the heat insulation board, there are two spacers between the heat insulation board and the second support arm plate. Under the action of the spacers, there is a gap between the heat insulation board and the second support arm plate, which makes it convenient to use the space between the heat insulation board and the second support arm plate to cut the first bolt, the second bolt or the third bolt by sawing, providing another way to deal with fasteners. Attached Figure Description
[0016] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0017] Figure 1 This is a schematic diagram of the structure of a marine crane clamping assembly according to the present invention;
[0018] Figure 2 This is another perspective view of a clamping assembly for a marine crane according to the present invention;
[0019] Figure 3 This is an exploded structural diagram of the heat insulation plate, the first arm plate, the second arm plate, the clamping hook, and the lifting lug in a marine crane clamping assembly according to the present invention.
[0020] Figure 4 This is an exploded view of the heat insulation plate, first arm plate, second arm plate, clamping hook, and lifting lug in a marine crane clamping assembly according to this utility model.
[0021] In the diagram: 1-Lifting lug, 2-First support arm plate, 3-L-shaped plate, 4-Positioning screw, 5-Pressure ring, 6-Second support arm plate, 7-First clamping strip, 8-Clamping hook, 9-Second clamping strip, 10-First nut, 11-Heat insulation plate, 12-Heat insulation ring cover, 13-Second nut, 14-Third nut, 15-First bolt, 16-Internal thread sleeve, 17-Second bolt, 18-Third bolt, 19-Second round hole, 20-First round hole, 21-Through hole, 22-Shaft hole, 23-Pan strip. Detailed Implementation
[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0023] Please see Figures 1-4 This utility model provides a technical solution: a clamping assembly for a marine crane, including a lifting lug 1. The lower end of the lifting lug 1 is rotatably connected to a first support plate 2 and a second support plate 6 by means of a second bolt 17 and a second nut 13. The heat insulation plate 11 has a pin hole at one end near the lifting lug 1. The first support plate 2 and the second support plate 6 have second round holes 19 that cooperate with the pin holes at one end near the lifting lug 1. The second bolt 17 is inserted into the channel formed by the second round hole 19 and the pin hole. The second bolt 17 cooperates with the second nut 13 to realize the rotatable connection between the first support plate 2, the second support plate 6 and the lifting lug 1.
[0024] See Figures 1-4 Multiple shaft holes 22 are provided on the side of the first support plate 2 facing the second support plate 6 and the side of the second support plate 6 facing the first support plate 2. A clamping hook 8 is provided between two opposite shaft holes 22. The clamping hook 8 has an L-shaped structure. The end of the first support plate 2 away from the lifting lug 1 and the end of the second support plate 6 away from the lifting lug 1 together with the clamping hook 8 form a clamping part. A first clamping strip 7 and a second clamping strip 9 are installed on the two parallel sides of the clamping hook 8. The first clamping strip 7 and the second clamping strip 9 are arranged perpendicular to each other. The first clamping strip 7 and the second clamping strip 9 increase the contact range between the clamping hook 8 and the plate. A pressure ring 5 is provided, which is located on the side away from the lifting lug 1 between the first support arm plate 2 and the second support arm plate 6. The first support arm plate 2 and the second support arm plate 6 near the pressure ring 5 are both provided with a first round hole 20. A third bolt 18 is inserted into the space formed by the two first round holes 20. The third bolt 18 passes through the pressure ring 5. The end of the third bolt 18 near the heat insulation plate 11 is threaded with a third nut 14. The third nut 14 is located inside the heat insulation ring cover 12. The third nut 14 and the third bolt 18 cooperate with each other to facilitate the disassembly of the pressure ring 5. The pressure ring 5 increases the contact range between the first support arm plate 2, the second support arm plate 6 and the plate.
[0025] See Figures 1-4 A first bolt 15 is inserted between two shaft holes 22, passing through a clamping hook 8. One end of the first bolt 15 is threadedly connected to a first nut 10. A heat insulation plate 11 is provided on the side of the second support plate 6 facing away from the first support plate 2. Both the first bolt 15 and the second bolt 17 pass through the heat insulation plate 11. The side of the heat insulation plate 11 facing the second support plate 6 has multiple through holes 21 that mate with the shaft holes 22. One end of the first bolt 15 passes through the through hole 21. A heat insulation ring cover 12 is provided on the side of the second support plate 6 facing away from the first support plate 2. Both the first nut 10 and the second nut 13 are located inside the heat insulation ring cover 12. An L-shaped plate 3 is installed at the middle of the upper surface of the heat insulation ring cover 12. The end of the L-shaped plate 3 away from the heat insulation ring cover 12 extends to the side of the first support plate 2 facing away from the second support plate 6. An internally threaded sleeve 16 is installed on the side of the L-shaped plate 3 facing the first support plate 2, passing through the L-shaped plate 3. The internally threaded sleeve 16 is internally threaded and connected to a useful... The positioning screw 4 restricts the relative position of the L-shaped plate 3 and the first support arm plate 2. The heat insulation plate 11 is installed on the side of the second support arm plate 6, forming a heat barrier with the heat insulation ring cover 12. The heat insulation ring cover 12 completely encloses the first nut 10, the second nut 13, and the third nut 14. When heated by open flame, the flame only contacts the outer surface of the heat insulation ring cover 12 and the heat insulation plate 11, preventing the flame from directly spraying onto the surface of the second support arm plate 6. This prevents the paint on the support arm plate from being burned and damaged by the flame during the process of heating the nuts with an open flame, and eliminates the problem of paint carbonization and peeling. When assembling components such as the lifting lug 1 and the clamping hook 8, the first bolt 15, the second bolt 17, and the third bolt 18 all penetrate the heat insulation plate 11, so that there is no need to use other fasteners to restrict the position of the heat insulation plate 11. The positioning screw 4 and the L-shaped plate 3 restrict the position of the heat insulation ring cover 12, which allows for convenient disassembly and assembly of the heat insulation ring cover 12 and the heat insulation plate 11. The heat insulation ring cover 12 can be removed when not using an open flame.
[0026] See Figures 1-4 Two spacers 23 are installed on the side of the heat insulation plate 11 facing the second support plate 6. The end of the spacer 23 away from the heat insulation plate 11 is in contact with the second support plate 6. When assembling the heat insulation plate 11, there are two spacers 23 between the heat insulation plate 11 and the second support plate 6. Under the action of the spacers 23, there is a gap between the heat insulation plate 11 and the second support plate 6, which makes it convenient to use the space between the heat insulation plate 11 and the second support plate 6 to cut the first bolt 15, the second bolt 17 or the third bolt 18 by sawing, providing another way to deal with fasteners.
[0027] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A clamping assembly for a marine crane, comprising lifting lugs, characterized in that: The lower end of the lifting lug is rotatably connected to a first support plate and a second support plate by a second bolt and a second nut. Multiple shaft holes are provided on the side of the first support plate facing the second support plate and the side of the second support plate facing the first support plate. A clamping hook with an L-shaped structure is provided between two opposing shaft holes. The end of the first support plate away from the lifting lug and the end of the second support plate away from the lifting lug, together with the clamping hook, form a clamping part. A first bolt is inserted between the two shaft holes, passing through the clamping hook. A first nut is threaded to one end of the first bolt. A heat insulation plate is provided on the side of the second support plate facing away from the first support plate, with both the first and second bolts passing through the heat insulation plate. A heat insulation ring is provided on the side of the second support plate facing away from the first support plate, connected to the first support plate via a connector. Both the first and second nuts are located inside the heat insulation ring.
2. The marine crane clamping assembly according to claim 1, characterized in that: A pressure ring is provided between the first support arm plate and the second support arm plate. The pressure ring is located on the side away from the lifting lug between the first support arm plate and the second support arm plate. A first circular hole is provided at the end of the first support arm plate near the pressure ring and at the end of the second support arm plate near the pressure ring. A third bolt is inserted into the space formed by the two first circular holes. The third bolt passes through the pressure ring. A third nut is threaded to the end of the third bolt near the heat insulation plate. The third nut is located inside the heat insulation ring cover.
3. A marine crane clamping assembly according to claim 1, characterized in that: Two pads are installed on the side of the heat insulation plate facing the second support plate, and the end of the pad away from the heat insulation plate is in contact with the second support plate.
4. A marine crane clamping assembly according to claim 1, characterized in that: The heat insulation plate has a plurality of through holes that mate with the shaft holes evenly on the side facing the second support plate. One end of the first bolt passes through the through hole. The heat insulation plate has a pin hole at the end near the lifting lug. The first support plate and the second support plate both have a second round hole that mates with the pin hole at the end near the lifting lug. A second bolt is inserted into the channel formed by the second round hole and the pin hole.
5. A marine crane clamping assembly according to claim 1, characterized in that: The connector includes an L-shaped plate. An L-shaped plate is installed at the middle of the upper surface of the heat insulation ring cover. The end of the L-shaped plate away from the heat insulation ring cover extends to the side of the first support arm plate away from the second support arm plate. The side of the L-shaped plate facing the first support arm plate is threaded with a positioning screw for limiting the relative position of the L-shaped plate and the first support arm plate.
6. A marine crane clamping assembly according to claim 5, characterized in that: An internal threaded sleeve is installed on the side of the L-shaped plate facing the first support arm plate, and one end of the positioning screw is threaded into the internal threaded sleeve.
7. A marine crane clamping assembly according to claim 1, characterized in that: The clamping hook is equipped with a first clamping bar and a second clamping bar on its two parallel sides, and the first clamping bar and the second clamping bar are arranged perpendicular to each other.