Infinite slewing device of marine crane

Abstract

The utility model discloses an unlimited slewing device for a marine crane, which is characterized in that the bottom of a crane slewing body is rotatably arranged on a barrel base, the unlimited slewing device is arranged at the axis of the crane slewing body rotating relative to the barrel base, a fixed part is arranged in the barrel base, and a rotating part is arranged in the crane slewing body; the rotating part is provided with a rotating end inserted into the fixed part, the rotating end is provided with a sliding ring part and a hydraulic oil core column, a brush carrier assembly and a hydraulic oil shell are sequentially and correspondingly arranged in the fixed part, the brush carrier assembly is arranged on the side face of the sliding ring part, and the hydraulic oil core column is inserted into the hydraulic oil shell; the hydraulic oil shell and the hydraulic oil core column are rotationally matched, and a positive-pressure purging cavity is formed in the end close to the sliding ring part. The infinite slewing device is a key component for transmitting current and signals, and is suitable for equipment which needs to continuously rotate and cannot be connected by a fixed electric wire. And the positive pressure purging cavity capable of continuously discharging oil is arranged between the hydraulic oil and the conductive slip ring, so that abnormal conditions such as pollution caused by oil escaping can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of marine cranes, and particularly relates to an infinitely rotating device for a marine crane. Background Art

[0002] A marine crane is a special crane that performs transportation operations in a marine environment, mainly used for important tasks such as the transportation and transfer of goods between ships or at ports, marine replenishment, and the deployment and recovery of underwater operation equipment. The special application environment at sea poses great challenges to the control of marine cranes. It requires the crane to have diverse actions. When the crane is performing a hoisting operation, it needs to make a 360° full rotation, and ensure normal operation at any rotation angle. A component capable of transmitting power is required between two relatively rotating parts. Among them, the infinitely rotating device is one of the important components of the crane, and the infinitely rotating device realizes the hybrid power transmission function during the rotation of the crane. The hybrid power includes hydraulic power and electric power. The hydraulic power is used to control the operation of components such as hydraulic cylinders on the rotating body of the crane; the electric power is generated by the electric energy generated by the generator on the fixed part of the hull and transmitted to the winch motor on the rotating body through the rotating device, so as to control the winding and unwinding of the cable to complete the hoisting operation.

[0003] At present, the devices for supplying power and hydraulic interaction to ship cranes are relatively large in volume and heavy. However, the space capacity on ships during actual use is very limited, and the traditional large interaction devices are no longer applicable. In view of the above, it is necessary to propose an infinitely rotating device for a marine crane to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects existing in the prior art and provide an infinitely rotating device for a marine crane.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows: An infinitely rotating device for a marine crane includes a cylindrical base, a crane rotating body, and an infinitely rotating device. The bottom of the crane rotating body is rotatably arranged on the cylindrical base, and an infinitely rotating device is provided at the axis of rotation of the crane rotating body relative to the cylindrical base.

[0006] The infinitely rotating device includes a fixed part and a rotating part. The fixed part is arranged inside the cylindrical base, and the rotating part is arranged inside the crane rotating body. The rotating part is provided with a rotating end inserted into the fixed part. A slip ring part and a hydraulic oil core column are arranged on the rotating end. A brush holder assembly and a hydraulic oil housing are sequentially arranged corresponding to each other inside the fixed part. The brush holder assembly is arranged on the side of the slip ring part, and the hydraulic oil core column is inserted into the hydraulic oil housing.

[0007] The hydraulic oil housing and the hydraulic oil core column are rotationally matched, and a positive pressure purging chamber is provided at one end close to the slip ring part.

[0008] Furthermore, it further includes a slewing bearing. A slewing bearing is provided between the cylindrical base and the crane slewing body, and the rotation connection is carried out by using the slewing bearing.

[0009] Furthermore, a bottom plate frame and a stator fixing bracket are provided at the center of the cylindrical base. The bottom of the housing of the fixing part is connected to the bottom plate frame through a vibration isolator, and the side part of the housing of the fixing part is connected to the stator fixing bracket through a vibration isolator. The stator fixing bracket is in a triangular frame structure. (The vibration isolator is a wire vibration isolator or a spring vibration isolator); the inner bottom of the crane slewing body is provided with a crane bottom plate, and a through groove is provided at the center position of the crane bottom plate. The through groove is used to accommodate the rotating part, and the outer wall of the rotating part is connected to the through groove through a rotor fixing bracket.

[0010] Furthermore, the positive pressure purging chamber includes an annular groove-shaped chamber coaxially formed on the inner wall of the hydraulic oil housing. The high point on one side of the annular groove-shaped chamber is connected to the purging inlet, and the low point on the other side of the annular groove-shaped chamber is connected to the purging outlet.

[0011] Furthermore, the annular groove-shaped chamber has an inclined bottom surface. The high point of the inclined bottom surface is close to the axis and the low point is far from the axis. An oil collecting groove is provided at the low point end of the inner bottom surface of the annular groove-shaped chamber, and the purging outlet is connected to the oil collecting groove.

[0012] Furthermore, the slip ring part includes an upper turntable and a lower turntable. The two turntables are coaxially arranged, and a plurality of conductive slip rings are evenly spaced between the two turntables. A plurality of groups of insulating fixing rods are circumferentially and evenly arranged through between the upper turntable and the lower turntable. The insulating fixing rods fix the conductive slip rings at uniform intervals along the axial direction to form a cage-like structure.

[0013] Furthermore, the brush holder assembly is divided into multiple groups and arranged around the outer periphery of the slip ring part. It includes an insulating bracket and a brush holder structure. The insulating bracket is arranged along the axial direction of the slip ring part, and a brush holder structure in electrical contact with the conductive slip ring is provided on the insulating bracket. The brush holder structure includes a locking seat, a locking piece, a rocker arm, and a carbon brush. The locking seat and the locking piece are cooperatively locked and fixed on the insulating bracket by screws. Two rocker arms are hinged in a V shape on the side of the locking seat close to the conductive slip ring, and a carbon brush is provided at the end of the rocker arm. The carbon brush is connected to the terminal in the stator junction box through a cable; a plurality of rotor end connection terminals are circumferentially and evenly arranged on the upper turntable, and the rotor end connection terminals are respectively connected to the inner side walls of the respective conductive slip rings.

[0014] Furthermore, a central column is provided along the axial direction in the middle of the upper turntable. A plurality of upper oil pipes are provided along the axial direction in the central column, and upper oil inlets corresponding to the upper oil pipes are provided on the outer wall of the central column.

[0015] Furthermore, the hydraulic oil core column is connected and arranged at the center of the lower end face of the lower turntable. A lower oil pipe communicated with the upper oil pipe is arranged inside the hydraulic oil core column. The lower ends of the lower oil pipes are distributed in height, and oil inlets communicating with the side wall are arranged at the lower ends of the lower oil pipes. A plurality of annular groove-shaped oil passage channels are arranged on the inner wall of the hydraulic oil housing. The oil passage channels are communicated with the corresponding oil inlets. Sealing rings are arranged between the oil passage channels. A lower oil receiving port is arranged on the surface of the hydraulic oil housing for the oil passage channels.

[0016] Furthermore, it further includes an angle detection structure, which includes a detection part arranged at the center of the bottom surface of the hydraulic oil housing and a detection block arranged at the center of the lower end face of the hydraulic oil core column. The rotation angle of the crane slewing body is obtained by detecting the rotation angle of the detection block by the detection part.

[0017] The advantages and beneficial effects of the present invention are as follows: The rotor and stator of the infinitely rotatable device of the marine crane of the present invention can rotate relative to each other infinitely, and it is a key component for transmitting current and signals. Its main task and function are to realize the transmission of power and signals between the rotating part and the fixed part of the system. It is applicable to equipment that requires continuous rotational motion and cannot use fixed wire connections. And a positive pressure purging chamber capable of continuously draining oil is arranged between the hydraulic oil and the slip ring, which can avoid abnormal situations such as oil leakage and pollution. Description of the Drawings

[0018] Figure 1 is the external view of the marine crane of the present invention;

[0019] Figure 2 is the installation sectional view of the infinitely rotatable device of the present invention;

[0020] Figure 3 is the view of the infinitely rotatable device of the present invention;

[0021] Figure 4 is the longitudinal sectional schematic view of the infinitely rotatable device of the marine crane of the present invention;

[0022] Figure 5 is the present invention Figure 4 the enlarged schematic view at the middle circle;

[0023] Figure 6 is the present invention Figure 4 the schematic view of the A-A section;

[0024] In the figure: 1, cylinder base; 2, crane slewing body; 3, infinite slewing device; 4, fixed part; 5, rotating part; 6, slip ring part; 7, hydraulic oil core column; 8, brush holder assembly; 9, hydraulic oil housing; 10, positive pressure purging chamber; 11, slewing bearing; 12, bottom plate frame; 13, stator fixing bracket; 14, vibration isolator; 15, crane bottom plate; 16, through groove; 17, rotor fixing frame; 18, annular groove chamber; 19, purging inlet; 20, purging outlet; 21, inclined bottom surface; 22, oil sump; 23, upper turntable; 24, lower turntable; 25, conductive slip ring; 26, insulating fixing rod; 27, insulating bracket; 28, locking seat; 29, locking piece; 30, rocker arm; 31, carbon brush; 32, stator junction box; 33, terminal; 34, rotor end terminal; 35, center column; 36, upper oil pipe; 37, upper oil interface; 38, lower oil pipe; 39, oil inlet; 40, oil passage; 41, lower oil receiving port; 42, angle detection structure; 43, sensor; 44, detection block. Detailed implementation manners

[0025] The following combines the drawings and embodiments to further describe the detailed implementation manners of the present utility model. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0026] A marine crane infinite slewing device, as Figures 1-6 shown, includes a cylinder base 1, a crane slewing body 2, and an infinite slewing device 3. The cylinder base 1 is arranged on the ship, and the bottom of the crane slewing body 2 is rotatably arranged on the cylinder base 1. An infinite slewing device is provided at the axis of rotation of the crane slewing body 2 relative to the cylinder base 1. A slewing bearing 11 is provided between the cylinder base 1 and the crane slewing body 2, and through the slewing bearing 11, the crane slewing body 2 can freely rotate on the ship.

[0027] The infinite slewing device 3 is provided to keep the oil circuit, power cable, and communication cable connected when the cylinder base 1 and the upper crane slewing body 2 rotate. Specifically, as Figure 2As shown, it includes a fixed part 4 and a rotating part 5. The fixed part 4 is arranged inside the cylinder base 1, and the rotating part 5 is arranged inside the crane revolving body 2. The inner bottom of the crane revolving body 2 is provided with a crane bottom plate 15. The outer ring of the slewing bearing 11 is connected to the crane bottom plate 15. The crane bottom plate 15 separates the cylinder base 1 and the crane revolving body 2. The fixed part 4 is arranged on the lower side of the crane bottom plate 15, and the rotating part 5 is arranged on the upper side of the crane bottom plate 15. A through groove 16 is provided at the center position of the crane bottom plate 15. The through groove 16 is used to accommodate the rotating part 5. The outer wall of the rotating part 5 is connected to the through groove 16 through a rotor fixing frame 17. The rotating part 5 is provided with a rotating end inserted into the fixed part 4, such as Figure 2 , 3 As shown, the rotating end passes through the bottom surface of the through groove 16 and enters the cylinder base 1. Further, a bottom plate frame 12 and a stator fixing bracket 13 are provided at the center of the cylinder base 1. The bottom plate frame 12 forms the installation base of the slewing device. The bottom of the shell of the fixed part 4 is connected to the bottom plate frame 12 through a vibration isolator 14. The side part of the shell of the fixed part 4 is connected to the stator fixing frame through a vibration isolator 14. The stator fixing frame is in a triangular frame structure. The vibration isolator 14 is a wire vibration isolator 14 or a spring vibration isolator 14. In this embodiment, taking the wire vibration isolator 14 as an example, the wire vibration isolator 14 can cope with the slight axial offset and radial offset during slewing. By setting the vibration isolator 14, the damage of the slewing device can be avoided.

[0028] The rotating end is inserted into the fixed part 4 and is relatively rotatably connected. Further, a slip ring part 6 and a hydraulic oil core column 7 are provided on the rotating end. A brush holder assembly 8 and a hydraulic oil shell 9 are sequentially arranged corresponding to each other inside the fixed part 4. The brush holder assembly 8 is arranged on the side of the slip ring part 6. The hydraulic oil core column 7 is inserted into the hydraulic oil shell 9. In practice, there is a certain probability of leakage at the rotating part of the hydraulic oil slewing device after long-term use, but it does not reach the standard for disassembly and repair. However, if it continues to be used, it is inevitable that the hydraulic oil will escape or even penetrate into the conductive slip ring 25, thus bringing greater use risks to the conductive and oil-returning slewing devices. The hydraulic oil usually has a relatively high pressure. Once it escapes, it may overflow everywhere, causing a burden on equipment cleaning, and the use risk of the power circuit is relatively high. Therefore, a positive pressure purging chamber 10 is provided at one end of the hydraulic oil shell 9 and the hydraulic oil core column 7 where they rotate and cooperate and are close to the slip ring part 6.

[0029] Specifically, such as Figure 4 , 5As shown, the positive pressure purging chamber 10 includes an annular groove-shaped chamber 18 coaxially formed on the inner wall of the hydraulic oil housing 9. The high point on one side of the annular groove-shaped chamber 18 is connected to the purging inlet 19, and the low point on the other side of the annular groove-shaped chamber 18 is connected to the purging outlet 20. In actual use, all the oil passage channels 40 are located below the positive pressure purging chamber 10. When there is a certain leakage in the rotary seal between the hydraulic oil core column 7 and the hydraulic oil housing 9, the hydraulic oil under pressure passes upward through the seal and enters the annular groove-shaped chamber 18. When the hydraulic oil enters this space from the narrow gap, its pressure decreases first. And because the chamber is always in a positive pressure purging state, the hydraulic oil can flow along with the air flow and finally be discharged from the purging outlet 20. In actual use, the purging outlet 20 can be led to an external transparent collection bottle through a pipeline, so that it is possible to directly observe and intuitively judge whether there is a leakage of hydraulic oil inside the rotating body, and decide whether to perform maintenance according to the leakage amount.

[0030] Further, as Figure 5 shown, the annular groove-shaped chamber 18 has an inclined bottom surface 21. The high point of the inclined bottom surface 21 is close to the axis and the low point is far from the axis, so that the annular groove-shaped chamber 18 forms a diversion slope towards the outside. Once there is a leakage of hydraulic oil, it can be diverted away from the axis through the inclined bottom surface 21, thus preventing the hydraulic oil from clinging to the surface of the hydraulic oil core column 7 and surging upward. A sump 22 is provided at the low point end of the inner bottom surface of the annular groove-shaped chamber 18. The hydraulic oil flowing down along the inclined bottom surface 21 is finally collected in the sump 22, and the purging outlet 20 is connected to the sump 22 to facilitate the discharge of the collected hydraulic oil.

[0031] Further, the slip ring part 6 includes an upper turntable 23 and a lower turntable 24. The two turntables are coaxially arranged, and a plurality of conductive slip rings 25 are evenly spaced between the two turntables. As Figure 4 、 6 shown, a plurality of groups of insulating fixing rods 26 are circumferentially and evenly arranged through between the upper turntable 23 and the lower turntable 24. An ear plate is provided inside the conductive slip ring 25, and the insulating fixing rod 26 passes through the ear plate to fix it. The insulating fixing rod 26 itself is made of insulating material, so that the respective conductive slip rings 25 are insulated from each other. And an insulating support sleeve is sleeved on the insulating fixing rod 26. The insulating support sleeve supports between two conductive slip rings 25 and separates them by a certain height. The insulating fixing rods 26 fix the conductive slip rings 25 at evenly spaced intervals along the axial direction to form a cage-like structure. It can be understood that this cage-like structure design enables the air inside and outside to flow mutually, so as to achieve a better heat dissipation effect, avoid the heat accumulation generated when the conductive slip ring 25 and the carbon brush 31 are in frictional contact, and a dedicated air circulation fan can also be provided in the fixing part 4 to increase the cooling effect.

[0032] Further, the brush holder assembly 8 is divided into multiple groups and arranged around the outer periphery of the slip ring portion 6. It includes an insulating bracket 27 and a brush holder structure. The insulating bracket 27 is arranged along the axial direction of the slip ring portion 6 and is also made of insulating material. The brush holder structures mounted thereon can be insulated from each other. The insulating bracket 27 is provided with a brush holder structure that is electrically in contact with the conductive slip ring 25. Specifically, as Figure 6 shown, the brush holder structure includes a locking seat 28, a locking piece 29, a rocker arm 30, and a carbon brush 31. The locking seat 28 and the locking piece 29 are cooperatively locked and fixed on the insulating bracket 27 by screws. On the side of the locking seat 28 close to the conductive slip ring 25, two rocker arms 30 are hinged in a V shape. The end of the rocker arm 30 is provided with a carbon brush 31, and the carbon brush 31 is connected to a terminal 33 in the stator junction box 32 through a cable. A plurality of rotor end terminals 34 are circumferentially and uniformly arranged on the upper turntable 23, and the rotor end terminals 34 are respectively connected to the inner side walls of the respective conductive slip rings 25. When multiple brush holder structures are axially distributed, the slip ring portion 6 can be evenly stressed during rotation. The two rocker arms 30 provided on each locking seat 28 are tightened by springs and abutted against the conductive slip ring 25 to form a sliding contact. The carbon brush 31 is connected to the terminal 33 of the stator junction box 32 through a cable, which facilitates the connection of various cables to the brush holder structure.

[0033] Further, as Figure 4 shown, a central column 35 is provided in the middle of the upper turntable 23 along the axial direction. A plurality of upper oil pipes 36 are provided in the central column 35 along the axial direction, and upper oil inlets 37 corresponding to the upper oil pipes 36 are provided on the outer wall of the central column 35. The hydraulic oil core column 7 is connected to the center of the lower end face of the lower turntable 24. A lower oil pipe 38 communicating with the upper oil pipe 36 is provided in the hydraulic oil core column 7. During actual use, the upper oil pipe 36 and the lower oil pipe 38 can be separately arranged, and they can be connected through an oil pipe. Or as Figure 4 shown, the upper oil pipe 36 and the lower oil pipe 38 are connected into one body through a central shaft, and an oil pipe is machined in the central shaft for connection. The lower ends of the lower oil pipes 38 are distributed in height, and an oil inlet 39 communicating with the side wall is provided at the lower end of the lower oil pipe 38. A plurality of annular groove-shaped oil passage channels 40 are provided on the inner wall of the hydraulic oil housing 9. The oil passage channels 40 are connected to the corresponding oil inlets 39, and seals are provided between the oil passage channels 40. A lower oil receiving port 41 is provided on the surface of the hydraulic oil housing 9 for the oil passage channels 40. During actual use, the hydraulic oil pipeline in the cylinder base 1 is connected to the lower oil receiving port 41, and the hydraulic oil inside can run up or down along the center of the slewing device.

[0034] Further, an angle detection structure 42 is also provided, which includes a detection part disposed at the center of the bottom surface of the hydraulic oil housing 9, and a detection block 44 disposed at the center of the lower end surface of the hydraulic oil core column 7. By detecting the rotation angle of the detection block 44 by the detection part, the rotation angle of the crane slewing body 2 can be obtained. In actual use, the detection block 44 can be a magnet, and the detection part can be a Hall detection element. The two do not need to be in contact. By using magnetic field induction, the detection part can conveniently convert the angle rotation of the infinite slewing device 3 into a current change, so that the rotation angle of the crane slewing body 2 can be conveniently understood.

[0035] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A marine crane infinite rotation device, characterized in that: The invention comprises a cylinder base (1), a crane slewing body (2), and an infinite slewing device (3), wherein the bottom of the crane slewing body (2) is rotatably arranged on the cylinder base (1), and the wireless slewing device is arranged at the axis of rotation of the crane slewing body (2) relative to the cylinder base (1). The infinite rotation device (3) comprises a fixed part (4) and a rotating part (5), the fixed part (4) being arranged in a cylinder base (1), the rotating part (5) being arranged in a crane rotating body (2), the rotating part (5) being provided with a rotating end inserted into the fixed part (4), the rotating end being provided with a slip ring part (6) and a hydraulic oil core column (7), the fixed part (4) being provided with a brush holder assembly (8) and a hydraulic oil housing (9) in sequence, the brush holder assembly (8) being arranged on a side of the slip ring part (6), and the hydraulic oil core column (7) being inserted into the hydraulic oil housing (9); The hydraulic oil housing (9) and the hydraulic oil core column (7) are rotatably matched and a positive pressure purge chamber (10) is provided at one end close to the slip ring portion (6).

2. The infinite rotation device for a marine crane according to claim 1, characterized in that: It also includes a slewing bearing (11), wherein a slewing bearing (11) is provided between the cylinder base (1) and the crane slewing body (2), and the slewing bearing (11) is used for rotational connection.

3. The infinite rotation device for a marine crane according to claim 1, characterized in that: A base frame (12) and a stator fixing bracket (13) are provided at the center of the cylinder base (1); the bottom of the shell of the fixing part (4) is connected to the base frame (12) via a vibration isolator (14); the side of the shell of the fixing part (4) is connected to the stator fixing bracket via a vibration isolator (14); the stator fixing bracket is a tripod structure; a crane base plate (15) is provided at the inner bottom of the crane slewing body (2); a through groove (16) is provided at the center of the crane base plate (15); the through groove (16) is used to accommodate the rotating part (5); and the outer wall of the rotating part (5) and the through groove (16) are connected via a rotor fixing bracket (17).

4. The infinite rotation device for a marine crane according to claim 1, characterized in that: The positive pressure purge chamber (10) comprises a circle of annular groove-shaped chambers (18) coaxially formed on the inner wall of the hydraulic oil housing (9), wherein a high point on one side of the annular groove-shaped chamber (18) is connected to a purge inlet (19), and a low point on the other side of the annular groove-shaped chamber (18) is connected to a purge outlet (20).

5. The infinite rotation device for a marine crane according to claim 4, characterized in that: The annular groove-shaped chamber (18) has an inclined bottom surface (21), the high point of the inclined bottom surface (21) is close to the axis center, and the low point is far from the axis center. An oil collecting groove (22) is provided at the low point end of the inner bottom surface of the annular groove-shaped chamber (18), and the purge outlet (20) is connected to the oil collecting groove (22).

6. The infinite rotation device for a marine crane according to claim 1, characterized in that: The slip ring portion (6) comprises an upper rotating disk (23) and a lower rotating disk (24), the two rotating disks being coaxially arranged, a plurality of conductive slip rings (25) being evenly spaced between the two rotating disks, a plurality of groups of insulating fixing rods (26) being evenly arranged in the circumferential direction passing through the upper rotating disk (23) and the lower rotating disk (24), the insulating fixing rods (26) fixing the conductive slip rings (25) at evenly spaced intervals in the axial direction to form a cage-like structure.

7. The infinite rotation device for a marine crane according to claim 6, characterized in that: The brush holder assembly (8) is divided into multiple groups and arranged around the outer periphery of the slip ring portion (6). The brush holder assembly (8) comprises an insulating bracket (27) and a brush holder structure. The insulating bracket (27) is arranged along the axial direction of the slip ring portion (6). The insulating bracket (27) is provided with a brush holder structure that is in electrical contact with the conductive slip ring (25). The brush holder structure comprises a locking seat (28), a locking plate (29), a rocker arm (30), and a carbon brush (31). The locking seat (28) and the locking plate (29) are matched and fastened by screws. The locking seat (28) is fixed on the insulating bracket (27), and two rocker arms (30) are hingedly provided in a V-shape on one side close to the conductive slip ring (25). The ends of the rocker arms (30) are provided with carbon brushes (31), and the carbon brushes (31) are connected to the connection terminals (33) in the stator connection box (32) through cables. The upper turntable (23) is evenly distributed with a plurality of rotor end terminals (34) in the circumferential direction, and the rotor end terminals (34) are respectively connected to the inner side walls of the conductive slip rings (25).

8. The infinite rotation device for a marine crane according to claim 6 or 7, characterized in that: A central column (35) is axially arranged in the middle of the upper rotating disk (23), a plurality of upper oil pipes (36) are axially arranged inside the central column (35), and upper oil interfaces (37) corresponding to the upper oil pipes (36) are respectively arranged on the outer wall of the central column (35).

9. The infinite rotation device for a marine crane according to claim 8, characterized in that: The hydraulic oil core column (7) is connected and arranged at the center of the lower end surface of the lower turntable (24); a lower oil pipe (38) is arranged in the hydraulic oil core column (7) and is relatively connected to the upper oil pipe (36); the lower ends of the lower oil pipes (38) are arranged in a distributed manner in height, and the lower ends of the lower oil pipes (38) are provided with oil inlets (39) connected to the side wall; the inner wall of the hydraulic oil housing (9) is provided with a plurality of annular groove-shaped oil passages (40); the oil passages (40) are connected to the corresponding oil inlets (39); sealing rings are provided between the oil passages (40); and the oil passages (40) are provided with lower oil receiving ports (41) on the surface of the hydraulic oil housing (9).

10. The infinite rotation device for a marine crane according to claim 1, characterized in that: It also includes an angle detection structure (42), which includes a detection part arranged at the center of the bottom surface of the hydraulic oil housing (9), and a detection block (44) arranged at the center of the lower end surface of the hydraulic oil core column (7). The rotation angle of the crane slewing body (2) can be obtained by detecting the rotation angle of the detection block (44) by the detection part.

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