Three-degree-of-freedom wave compensation offshore derrick crane pedestal

Abstract

The invention discloses a three-degree-of-freedom wave-compensating offshore crane base, which relates to the technical field of marine engineering equipment. It solves the problem that the load weight of existing marine wave compensation equipment needs to be directly borne by the lifting hydraulic cylinder, which not only places high performance requirements on the lifting hydraulic cylinder, but also easily causes a short service life of the lifting hydraulic cylinder. The key points of its technical solution include: a load-bearing base, a first rotating device, a second rotating device, a load-bearing platform, a second lifting device, and a third lifting device; the movable end of the second rotating device, the movable end of the second lifting device, and the movable end of the third lifting device are respectively connected to the same side of the load-bearing platform and arranged in a triangle; this solution only requires the use of three fulcrums to realize the lifting and compensating action of the load-bearing platform, and can also make full use of the good load-bearing performance of the load-bearing base to ensure that the load-bearing platform has a high load-bearing capacity, thereby ensuring the operating ability when carrying large-load workpieces.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering equipment, and in particular to a three-degree-of-freedom wave-compensated marine crane base. Background Art

[0002] Offshore crane, also known as ship crane, is a large machine arranged on the deck of marine structures (such as ships). It is equipment for loading and unloading cargo. It has the advantages of large lifting capacity, impact resistance, good braking performance, safety and reliability, and high operating efficiency. It is widely used in the field of marine engineering equipment.

[0003] During actual operation, offshore cranes are affected by ocean waves and will undergo complex motions with six degrees of freedom, including roll, pitch, and heave, along with the ship's hull, which can interfere with the operation of the ship's cranes. In actual operation, due to the influence of the ship's hull movement, the hoisted loads may collide with the ship's deck, offshore platform, or other targets, causing safety accidents and posing a serious threat to the safety of life, property, and the marine environment. Developed countries such as the United States and Germany have developed relatively mature offshore crane products with wave compensation capabilities and have put them on the market, achieving certain results in actual production. However, these products often have complex structures, numerous overall systems, and are difficult to install. my country's research on wave compensation devices started relatively late, and there is still a large gap compared to the mature products of developed countries. Most general ship cranes do not have wave compensation capabilities.

[0004] Existing ocean wave compensation equipment generally includes a platform and several lifting hydraulic cylinders arranged under the platform. The platform is then compensated for sea waves through the lifting and lowering actions of the several lifting hydraulic cylinders. However, when heavy objects are loaded on the platform, the weight of the heavy objects and the platform needs to be directly borne by the lifting hydraulic cylinders. Since the lifting hydraulic cylinders need to work under high load conditions for a long time, not only are high performance requirements placed on the lifting hydraulic cylinders, but the service life of the lifting hydraulic cylinders is also easily shortened. Summary of the Invention

[0005] The purpose of the invention is to provide a three-degree-of-freedom wave-compensating offshore crane base. This solution only requires three fulcrums to achieve the lifting and compensating action of the load-bearing platform in response to offshore waves. It can also make full use of the good load-bearing performance of the load-bearing base and use the load-bearing base as a fulcrum to ensure that the load-bearing platform has a high load-bearing capacity, thereby ensuring its operating ability when carrying large-load workpieces.

[0006] The above technical objectives of the invention are achieved through the following technical solutions:

[0007] Three-degree-of-freedom heave compensation offshore crane base, including:

[0008] load-bearing base;

[0009] A first rotating device, which is arranged on the load-bearing base;

[0010] A second rotating device is provided on the movable end of the first rotating device, and its rotation axis is perpendicular to the rotation axis of the first rotating device;

[0011] a load-bearing platform, which is rotatably connected to the second rotating device;

[0012] a second lifting device, the movable end of which is connected to the load-bearing platform;

[0013] a third lifting device, the movable end of which is connected to the load-bearing platform;

[0014] The movable end of the second rotating device, the movable end of the second lifting device, and the movable end of the third lifting device are respectively connected to the same side surface of the load-bearing platform and are arranged in a triangle.

[0015] Since the load-bearing base can serve as a fulcrum to bear the weight, the first rotating device and the second rotating device are perpendicular to each other in the rotation axis, so that the load-bearing platform can complete the rotation adjustment in two directions. It can be seen that the load-bearing base, the first rotating device and the second rotating device can serve as the force bearing points. At the same time, the above three can also be linked with the other second lifting device and the third lifting device to realize the lifting and lowering adjustment of the load-bearing platform through the lifting and lowering actions of the second lifting device and the third lifting device; compared with the conventional wave compensation equipment composed of several lifting hydraulic cylinders, this solution only needs to use three fulcrums (the three fulcrums are the load-bearing base, the second lifting device and the third lifting device). The third lifting device) can realize the lifting and compensating action of the load-bearing platform in response to the waves at sea, specifically refers to the compensation of the three degrees of freedom of motion of lateral swing, longitudinal roll and heave between the hull, so that the footprint of this solution is much smaller than that of other published wave compensation device bases, so as to reduce the structural modification requirements and floor space required for marine equipment (such as ships, marine engineering equipment, etc.), and facilitate modular installation and transportation, further reducing the cost of use; moreover, this solution can make full use of the good load-bearing performance of the load-bearing base, and use the load-bearing base as a fulcrum to ensure that the load-bearing platform has a high load-bearing capacity, thereby ensuring the operation ability when carrying large-load workpieces.

[0016] In some embodiments, the load-bearing platform comprises:

[0017] a sliding sleeve having a sliding channel;

[0018] A lifting tower is slidably connected to the sliding channel;

[0019] The first lifting device is arranged on the movable end of the second rotating device, and its sliding end is connected to the lifting tower. It can drive the lifting tower to rise and fall in the sliding channel; the movable end of the second rotating device, the movable end of the second lifting device, and the movable end of the third lifting device are respectively connected to the bottom of the sliding sleeve.

[0020] Therefore, this solution provides a specific structural structure of a load-bearing platform that can be raised and lowered. By utilizing the combination of a sliding sleeve and a lifting tower, compared with the existing non-adjustable platform structure, the load-bearing platform of this solution can add a height lifting and lowering adjustment function on the basis of realizing the lifting and lowering compensation action; secondly, openings are provided at both ends of the sliding channel on the sliding sleeve, and combined with the sleeve-type sliding structure, it is convenient to adapt to the ship use environment where water is easily accumulated.

[0021] In some specific embodiments, the sliding channel is triangular, the outer wall of the lifting tower matches the inner wall of the sliding channel, a sliding rail portion is provided in the sliding channel, and a sliding roller is provided on the outer wall of the lifting tower, and the sliding roller is slidably connected to the sliding rail portion.

[0022] Therefore, the outer wall of the lifting tower is triangular, and the triangular load-bearing platform can better adapt to the load-bearing base, the second lifting device, and the third lifting device used in this solution as three fulcrums, so as to improve the stability of the load-bearing platform during the lifting and compensation action by utilizing the stability of the triangular structure.

[0023] In some specific embodiments, the number of the first lifting devices is at least three, and reinforcement members are sleeved on the fixed ends of at least three first lifting devices.

[0024] In some specific embodiments, there are multiple reinforcement members that are connected into one piece.

[0025] Therefore, the reinforcement is a multi-layer structure with reinforcement plates and frame materials welded between each layer; the reinforcement is rigidly connected to the fixed end of the first lifting device to prevent the first lifting device from tipping over during the force application process, thereby ensuring the working stability of the first lifting device.

[0026] In some embodiments, comprising:

[0027] a third rotating device rotatably connected to the bottom of the sliding sleeve;

[0028] a fourth rotating device, one end of which is rotatably connected to the third rotating device, and the other end of which is connected to the movable end of the second lifting device;

[0029] The rotation axis of the third rotating device and the rotation axis of the fourth rotating device are perpendicular to each other.

[0030] Preferably, the rotation axis of the third rotating device is the same as the rotation axis of the first rotating device, and the rotation axis of the fourth rotating device is the same as the rotation axis of the second rotating device, thereby allowing two degrees of freedom between the sliding sleeve and the movable end of the second lifting device, and the degrees of freedom are associated with the adjustment of the load-bearing platform.

[0031] In some embodiments, comprising:

[0032] a fifth rotating device rotatably connected to the fixed end of the second lifting device;

[0033] a sixth rotating device, which is rotatably connected to the fifth rotating device;

[0034] The rotation axis of the fifth rotating device and the rotation axis of the sixth rotating device are perpendicular to each other.

[0035] Preferably, the rotation axis of the fifth rotating device is the same as the rotation axis of the second rotating device, and the rotation axis of the sixth rotating device is the same as the rotation axis of the first rotating device, so that the fixed end of the second lifting device has two degrees of freedom when installed on the ship, and the degrees of freedom are associated with the adjustment of the load-bearing platform.

[0036] In some embodiments, comprising:

[0037] a seventh rotating device rotatably connected to the bottom of the sliding sleeve;

[0038] an eighth rotating device, one end of which is rotatably connected to the seventh rotating device, and the other end of which is connected to the movable end of the third lifting device;

[0039] The rotation axis of the seventh rotating device and the rotation axis of the eighth rotating device are perpendicular to each other.

[0040] Preferably, the rotation axis of the seventh rotating device is the same as the rotation axis of the first rotating device, and the rotation axis of the eighth rotating device is the same as the rotation axis of the second rotating device, thereby enabling two degrees of freedom between the sliding sleeve and the movable end of the third lifting device, and the degrees of freedom are associated with the adjustment of the load-bearing platform.

[0041] In some embodiments, comprising:

[0042] a ninth rotating device rotatably connected to the fixed end of the third lifting device;

[0043] a tenth rotating device, which is rotatably connected to the ninth rotating device;

[0044] The rotation axis of the ninth rotating device and the rotation axis of the tenth rotating device are perpendicular to each other.

[0045] Preferably, the rotation axis of the ninth rotating device is the same as the rotation axis of the second rotating device, and the rotation axis of the tenth rotating device is the same as the rotation axis of the first rotating device, so that the fixed end of the third lifting device has two degrees of freedom when installed on the ship, and the degrees of freedom are associated with the adjustment of the load-bearing platform.

[0046] In some specific embodiments, the load-bearing base includes a first abutting portion, a first supporting portion, a second supporting portion, and a second abutting portion that are sequentially connected into one piece; a gap is left between the first supporting portion and the second supporting portion or the base is solid.

[0047] As a result, the cross-sectional area of the main load-bearing structure of the load-bearing base is basically not reduced, the first abutting portion and the second abutting portion can increase the base area and can be connected to the ship, and the first supporting portion and the second supporting portion have good force support.

[0048] In summary, this solution only requires three fulcrums to achieve the lifting and compensating action of the load-bearing platform in response to sea waves. It can also make full use of the good load-bearing performance of the load-bearing base and use the load-bearing base as a fulcrum to ensure that the load-bearing platform has a high load-bearing capacity, thereby ensuring its operating ability when carrying large-load workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural diagram of this embodiment;

[0050] Figure 2 is a structural diagram of another perspective of this embodiment;

[0051] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0052] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0053] Figure 5 yes Figure 2 Enlarged view of point C in the middle;

[0054] Figure 6 yes Figure 2 Enlarged view of point D in the middle;

[0055] Figure 7 yes Figure 2 Enlarged view of point E in the middle;

[0056] Figure 8 Schematic diagram of the explosion structure of this embodiment;

[0057] Figure 9 yes Figure 8 Enlarged view of point F in the middle;

[0058] Figure 10 It is a schematic diagram of the connection relationship between the first rotating device, the second rotating device and the load-bearing base;

[0059] Figure 11 Schematic diagram of the positional relationship of several reinforcement members in this embodiment.

[0060] Reference numerals:

[0061] 1. Load-bearing base; 11a. First abutting portion; 11b. First supporting portion; 11c. Second supporting portion; 11d. Second abutting portion;

[0062] 21. First rotating device; 22. Second rotating device;

[0063] 31. Third rotating device; 32. Fourth rotating device;

[0064] 41. Fifth rotating device; 42. Sixth rotating device;

[0065] 51. Seventh rotating device; 52. Eighth rotating device;

[0066] 61. Ninth rotating device; 62. Tenth rotating device;

[0067] 7. Load-bearing platform; 71. First lifting device; 711. Reinforcement member; 711a. Reinforcement plate; 711b. Reinforcement frame; 72. Sliding sleeve; 72a. Sliding channel; 72a1. Sliding rail; 73. Lifting tower; 73a. Sliding roller;

[0068] 82. Second lifting device; 83. Third lifting device. DETAILED DESCRIPTION

[0069] The invention will be described in further detail below with reference to the accompanying drawings.

[0070] Three-degree-of-freedom wave compensation offshore crane base, such as Figures 1 to 11 As shown, it includes: a load-bearing base 1, a first rotating device 21, a second rotating device 22, a second lifting device 82, and a third lifting device 83, which are specifically as follows:

[0071] The load-bearing base 1 is used for installation on a ship; Figure 10 As shown, the load-bearing base 1 includes a first abutting portion 11a, a first supporting portion 11b, a second supporting portion 11c, and a second abutting portion 11d, which are sequentially connected and integrated. A gap is left between the first supporting portion 11b and the second supporting portion 11c. However, the load-bearing base 1 is not limited to this. Alternatively, the load-bearing base 1 may be a solid structure, i.e., no gap is left between the first supporting portion 11b and the second supporting portion 11c.

[0072] Therefore, the cross-sectional area of the main load-bearing structure of the load-bearing base 1 is basically not reduced, the first abutting portion 11a and the second abutting portion 11d can increase the base area and can be connected to the ship, and the first supporting portion 11b and the second supporting portion 11c have good force support.

[0073] like Figure 3 As shown, the first rotating device 21 is arranged on the load-bearing base 1; the second rotating device 22 is arranged on the movable end of the first rotating device 21, and its rotation axis is perpendicular to the rotation axis of the first rotating device 21; the first rotating device 21 and the second rotating device 22 constitute a first hinge mechanism.

[0074] The load-bearing platform 7 is rotatably connected to the second rotating device 22. In this embodiment, the load-bearing platform 7 includes: a sliding sleeve 72, a lifting tower 73, and a first lifting device 71, which are specifically as follows:

[0075] like Figure 8 and Figure 9 As shown, the sliding sleeve 72 has a sliding channel 72a; the lifting tower 73 is slidably connected to the sliding channel 72a. Specifically, the sliding channel 72a is triangular in shape, with the outer wall of the lifting tower 73 matching the inner wall of the sliding channel 72a. The sliding channel 72a is provided with a slide rail 72a1, and the outer wall of the lifting tower 73 is provided with a sliding roller 73a, which is slidably connected to the slide rail 72a1. As a result, the outer wall of the lifting tower 73 is triangular in shape. The triangular shape of the load-bearing platform 7 is more suitable for the load-bearing base 1, the second lifting device 82, and the third lifting device 83 used in this solution as three fulcrums. This improves the stability of the load-bearing platform 7 during the lifting and compensation process by leveraging the stability of the triangular structure.

[0076] A second lifting device 82, whose movable end is connected to the bottom of the sliding sleeve 72 of the load-bearing platform 7;

[0077] A third lifting device 83, whose movable end is connected to the bottom of the sliding sleeve 72 of the load-bearing platform 7;

[0078] The movable end of the second rotating device 22 , the movable end of the second lifting device 82 , and the movable end of the third lifting device 83 are respectively connected to the same side surface of the load-bearing platform 7 and arranged in a triangle.

[0079] A first lifting device 71 is provided on the movable end of the second rotating device 22, and its sliding end is connected to the lifting tower 73, and is capable of driving the lifting tower 73 to move up and down in the sliding channel 72a;

[0080] The movable end of the second rotating device 22 , the movable end of the second lifting device 82 , and the movable end of the third lifting device 83 are respectively connected to the bottom of the sliding sleeve 72 .

[0081] Therefore, this solution provides a specific structural structure of a load-bearing platform 7 that can be raised and lowered. By utilizing the combination of a sliding sleeve 72 and a lifting tower 73, compared with the existing non-adjustable platform structure, the load-bearing platform 7 of this solution can add a height lifting and lowering adjustment function on the basis of realizing the lifting and lowering compensation action; secondly, openings are provided at both ends of the sliding channel 72a on the sliding sleeve 72, and combined with the sleeve-type sliding structure, it is convenient to adapt to the ship use environment where water is easily accumulated.

[0082] Preferably, there are at least three first lifting devices 71, and reinforcement members 711 are provided on the fixed ends of at least three first lifting devices 71. Specifically, in this embodiment, there are three first lifting devices 71. However, this is not limiting. The number of first lifting devices 71 can also be less than three, for example, one or two. If the number exceeds two, reinforcement members 711 are required to achieve overall reinforcement.

[0083] like Figure 11 As shown, there are several reinforcement members 711 connected together, and the several reinforcement members 711 are stacked along the lifting direction of the first lifting device 71. The reinforcement members 711 are multi-layered and reinforcement plates 711a and reinforcement bones 711b are welded between each layer. The reinforcement members 711 are rigidly connected to the fixed end of the first lifting device 71 to prevent the first lifting device 71 from tipping over during the force transmission process, thereby ensuring the working stability of the first lifting device 71. This solution adds an anti-instability component (i.e., reinforcement member 711) to the weak link (fixed end of the first lifting device 71) during the force transmission process to avoid the risk of failure of some mechanisms in actual operation, thereby enhancing the overall stability and structural stability of this solution.

[0084] Specifically, this embodiment also includes:

[0085] a third rotating device 31 rotatably connected to the bottom of the sliding sleeve 72;

[0086] a fourth rotating device 32, one end of which is rotatably connected to the third rotating device 31, and the other end of which is connected to the movable end of the second lifting device 82;

[0087] The rotation axis of the third rotating device 31 and the rotation axis of the fourth rotating device 32 are perpendicular to each other.

[0088] Preferably, the rotation axis of the third rotating device 31 is the same as the rotation axis of the first rotating device 21, and the rotation axis of the fourth rotating device 32 is the same as the rotation axis of the second rotating device 22, thereby allowing two degrees of freedom between the sliding sleeve 72 and the movable end of the second lifting device 82, and the degrees of freedom are associated with the adjustment of the load-bearing platform 7.

[0089] Specifically, if Figure 5 As shown, this embodiment also includes:

[0090] a fifth rotating device 41 rotatably connected to the fixed end of the second lifting device 82;

[0091] a sixth rotating device 42, which is rotatably connected to the fifth rotating device 41;

[0092] The rotation axis of the fifth rotating device 41 and the rotation axis of the sixth rotating device 42 are perpendicular to each other.

[0093] Preferably, the rotation axis of the fifth rotating device 41 is the same as the rotation axis of the second rotating device 22, and the rotation axis of the sixth rotating device 42 is the same as the rotation axis of the first rotating device 21, so that the fixed end of the second lifting device 82 has two degrees of freedom when installed on the ship, and the degree of freedom is associated with the adjustment of the load-bearing platform 7.

[0094] Specifically, if Figure 6 As shown, this embodiment also includes:

[0095] a seventh rotating device 51 rotatably connected to the bottom of the sliding sleeve 72;

[0096] an eighth rotating device 52, one end of which is rotatably connected to the seventh rotating device 51, and the other end of which is connected to the movable end of the third lifting device 83;

[0097] The rotation axis of the seventh rotating device 51 and the rotation axis of the eighth rotating device 52 are perpendicular to each other.

[0098] Preferably, the rotation axis of the seventh rotating device 51 is the same as the rotation axis of the first rotating device 21, and the rotation axis of the eighth rotating device 52 is the same as the rotation axis of the second rotating device 22, thereby allowing two degrees of freedom between the sliding sleeve 72 and the movable end of the third lifting device 83, and the degrees of freedom are associated with the adjustment of the load-bearing platform 7.

[0099] Specifically, if Figure 7 As shown, this embodiment also includes:

[0100] a ninth rotating device 61 rotatably connected to a fixed end of the third lifting device 83;

[0101] a tenth rotating device 62, which is rotatably connected to the ninth rotating device 61;

[0102] The rotation axis of the ninth rotating device 61 and the rotation axis of the tenth rotating device 62 are perpendicular to each other.

[0103] Preferably, the rotation axis of the ninth rotating device 61 is the same as the rotation axis of the second rotating device 22, and the rotation axis of the tenth rotating device 62 is the same as the rotation axis of the first rotating device 21, so that the fixed end of the third lifting device 83 has two degrees of freedom when installed on the ship, and the degree of freedom is associated with the adjustment of the load-bearing platform 7.

[0104] In this embodiment, the first lifting device 71 , the second lifting device 82 , and the third lifting device 83 are all hydraulic cylinders. Specifically, the fixed ends of the three are piston cylinder parts, and the movable ends of the three are piston rod parts.

[0105] Beneficial effects

[0106] This solution boasts a simple structure, making it easy to install and maintain. Furthermore, it utilizes a simple and reliable telescopic cylinder, a rotating device, and a sliding mechanism, all coordinated in a rational manner to achieve three-degree-of-freedom motion compensation between the crane's mounting plane and the vessel's hull: roll, pitch, and heave. This solution compensates for the three degrees of freedom of the crane's motion when marine equipment (such as ships and offshore platforms) experiences roll, pitch, and heave motion due to adverse sea conditions. It also limits the crane's displacement or rotation in the horizontal (e.g., along the ship's width), longitudinal (e.g., along the ship's length), and horizontal plane (e.g., parallel to the ship's deck), ensuring the crane maintains a stable horizontal position even in adverse sea conditions.

[0107] Since the load-bearing base 1 can serve as a fulcrum to bear weight, the first rotating device 21 and the second rotating device 22 are perpendicular to each other in the rotation axis, so that the load-bearing platform 7 can complete rotation adjustment in two directions. It can be seen that the load-bearing base 1, the first rotating device 21, and the second rotating device 22 can serve as force-bearing points. At the same time, the above three can also be linked with the other second lifting device 82 and the third lifting device 83 to realize the lifting and lowering adjustment of the load-bearing platform 7 through the lifting and lowering actions of the second lifting device 82 and the third lifting device 83. It can be seen that this solution has a high load-bearing capacity and ensures large-load operation capabilities.

[0108] Compared with conventional wave compensation equipment composed of several lifting hydraulic cylinders, this solution only needs to use three fulcrums (the three fulcrums are the load-bearing base 1, the second lifting device 82, and the third lifting device 83) to realize the lifting and compensating action of the load-bearing platform 7 in response to sea waves, specifically referring to the three-degree-of-freedom motion compensation of lateral sway, longitudinal sway and heave between the hulls, so that the footprint of this solution is much smaller than that of other published wave compensation device bases, so as to reduce the structural modification requirements and floor space required for marine equipment (such as ships, marine engineering equipment, etc.), and facilitate modular installation and transportation, further reducing the cost of use, and no large-scale modification of the original structure is required during installation; and this solution can make full use of the good load-bearing performance of the load-bearing base 1, and use the load-bearing base 1 as a fulcrum to ensure that the load-bearing platform 7 has a high load-bearing capacity, thereby ensuring the operating capacity when carrying large-load workpieces.

[0109] This specific embodiment is merely an explanation of the invention and is not a limitation of the invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of the claims of the invention, they are protected by patent law.

Claims

1. Three-degree-of-freedom wave compensation offshore crane base, characterized by: include: load-bearing base; A first rotating device, which is arranged on the load-bearing base; a second rotating device, which is arranged on the movable end of the first rotating device, and whose rotation axis is perpendicular to the rotation axis of the first rotating device; a load-bearing platform, rotatably connected to the second rotating device; a second lifting device, the movable end of which is connected to the load-bearing platform; a third lifting device, a movable end of which is connected to the load-bearing platform; The movable end of the second rotating device, the movable end of the second lifting device, and the movable end of the third lifting device are respectively connected to the same side surface of the load-bearing platform and arranged in a triangle; The load-bearing platform also includes: a sliding sleeve having a sliding channel; a lifting tower slidably connected to the sliding channel; a first lifting device, which is provided on the movable end of the second rotating device, and whose sliding end is connected to the lifting tower, and is capable of driving the lifting tower to move up and down in the sliding channel; The movable end of the second rotating device, the movable end of the second lifting device, and the movable end of the third lifting device are respectively connected to the bottom of the sliding sleeve.

2. The three-degree-of-freedom wave-compensating offshore crane base according to claim 1, characterized in that: The sliding channel is triangular in shape, the outer wall of the lifting tower matches the inner wall of the sliding channel, a sliding rail portion is provided in the sliding channel, a sliding roller is provided on the outer wall of the lifting tower, and the sliding roller is slidably connected to the sliding rail portion.

3. The three-degree-of-freedom wave-compensating offshore crane base according to claim 1, characterized in that: The number of the first lifting devices is at least three, and reinforcement pieces are sleeved on the fixed ends of at least three of the first lifting devices.

4. The three-degree-of-freedom wave-compensating offshore crane base according to claim 3, characterized in that: There are several reinforcement members which are connected into one body.

5. The three-degree-of-freedom wave-compensating offshore crane base according to claim 1, characterized in that: include: a third rotating device, which is rotatably connected to the bottom of the sliding sleeve; a fourth rotating device, one end of which is rotatably connected to the third rotating device, and the other end of which is connected to the movable end of the second lifting device; The rotation axis of the third rotating device and the rotation axis of the fourth rotating device are perpendicular to each other.

6. The three-degree-of-freedom wave-compensating offshore crane base according to claim 1, characterized in that: include: a fifth rotating device rotatably connected to the fixed end of the second lifting device; a sixth rotating device, which is rotatably connected to the fifth rotating device; The rotation axis of the fifth rotating device and the rotation axis of the sixth rotating device are perpendicular to each other.

7. The three-degree-of-freedom heave-compensating offshore crane base according to claim 1, characterized in that: include: a seventh rotating device rotatably connected to the bottom of the sliding sleeve; an eighth rotating device, one end of which is rotatably connected to the seventh rotating device, and the other end of which is connected to the movable end of the third lifting device; The rotation axis of the seventh rotating device and the rotation axis of the eighth rotating device are perpendicular to each other.

8. The three-degree-of-freedom wave-compensating offshore crane base according to claim 1, characterized in that: include: a ninth rotating device, rotatably connected to the fixed end of the third lifting device; a tenth rotating device, which is rotatably connected to the ninth rotating device; The rotation axis of the ninth rotating device and the rotation axis of the tenth rotating device are perpendicular to each other.

9. The three-degree-of-freedom heave-compensating offshore crane base according to claim 1, characterized in that: The load-bearing base includes a first abutting portion, a first supporting portion, a second supporting portion, and a second abutting portion which are sequentially connected into one body.

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