Offshore platform cranes and offshore platforms

Abstract

The present invention relates to the field of lifting, and provides an offshore platform crane and an offshore platform. The crane includes: a turntable, provided with a positioning hole, in which a first positioning member is detachably inserted; an arm, provided with a matching member, the turntable and the arm are rotatably connected through a hoisting device, the first positioning member is suitable for passing through the positioning hole and matching with the matching member to limit the rotation of the arm; the hoisting device includes a drum, a drive motor, a centrifugal speed limiter and a limiter; the limiter switches between a limit state and an idle state; in the idle state, the limiter disengages from the centrifugal speed limiter, releasing the brake on the drive motor, so that the material descends under gravity, and when the descending speed of the material reaches the set speed, the centrifugal speed limiter controls the drum to decelerate. According to the crane of the present invention, the material can also be dropped normally in an emergency, and the falling speed of the material is within a controllable range, and the height of the arm can be lowered by removing the first positioning member, which is convenient for maintenance.

Description

Technical Field

[0001] The present invention relates to the field of lifting technology, in particular to an offshore platform crane and an offshore platform. Background Art

[0002] Currently, many offshore platform cranes are unable to lower materials suspended in mid-air to the wind turbine tower platform or transport ship in an emergency (power outage or crane failure). The cranes can only be operated after power is restored or the failure is eliminated. Materials suspended in mid-air for a long time pose uncontrollable risks. For example, the materials may swing in the wind, causing damage to the materials or the tower.

[0003] Furthermore, in related technologies, the boom assembly installed on offshore platforms is typically a fixed-arm type. For fixed-arm booms, the boom head is relatively high from the wind turbine tower platform, typically exceeding 2.5 meters. This makes maintenance of the wire rope and boom head difficult. Currently, most technologies utilize ladders or similar auxiliary facilities such as lifting platforms to complete this task. However, the use of auxiliary facilities has the following drawbacks: first, there are certain safety risks; second, it increases maintenance costs. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an offshore platform crane.

[0005] The present invention also provides an offshore platform.

[0006] An offshore platform crane according to a first embodiment of the present invention includes:

[0007] The turntable is provided with a positioning hole, wherein a first positioning member is detachably inserted into the positioning hole;

[0008] The arm is provided with a matching piece, the turntable and the arm are rotatably connected through the hoisting device, and the first positioning piece is adapted to pass through the positioning hole and match the matching piece to limit the rotation of the arm;

[0009] The hoisting device includes a drum, a driving motor, a centrifugal speed limiter and a limiting member, wherein the driving motor and the centrifugal speed limiter are respectively connected to the drum in a transmission manner;

[0010] The limiting member is movable relative to the centrifugal speed limiter to switch between a limiting state and an idle state; in the idle state, the limiting member disengages from the centrifugal speed limiter, and then releases the brake on the drive motor, so that the material moves downward under the action of its own gravity, and when the descending speed of the material reaches a set speed, the centrifugal speed limiter controls the reel to decelerate.

[0011] According to the offshore platform crane of the embodiment of the present invention, on the one hand, materials can also be dropped normally in an emergency, avoiding the dangerous factors caused by the materials hovering in the air for a long time. On the other hand, the falling speed of the materials is within a controllable range, thereby avoiding other dangers caused by the materials falling too quickly, thereby improving the emergency handling performance and safety performance of the device.

[0012] In addition, the first positioning member can fix the boom when the boom lifts materials, ensuring stable installation between the boom and the turntable. When the boom needs maintenance, the height of the boom can also be lowered by removing the first positioning member, thereby facilitating manual maintenance of the boom.

[0013] According to one embodiment of the present invention, the centrifugal speed limiter includes a transmission shaft, a swing block and a speed limiting member, the transmission shaft is connected to the rotating shaft of the reel, and in the limiting state, the limiting member and the swing block cooperate with each other to limit the swinging out of the swing block; in the idle state, the limiting member is disengaged from the swing block, and the friction between the thrown swing block and the speed limiting member is used to limit the rotation speed of the reel.

[0014] According to one embodiment of the present invention, the driving end of the driving motor is connected to the rotating shaft of the reel via a transmission sleeve, the limiting member is slidably sleeved outside the transmission sleeve, and the transmission shaft is fixedly sleeved outside the transmission sleeve;

[0015] The limiting member is provided with a limiting portion, and the swing block is provided with a matching portion. The limiting portion and the matching portion are arranged opposite to each other. The limiting member is suitable for sliding along the length direction of the transmission sleeve to drive the limiting portion to disengage from or match with the matching portion.

[0016] According to one embodiment of the present invention, one of the limiting portion and the matching portion is an insertion rod, and the other of the limiting portion and the matching portion is a socket;

[0017] In the limited state, the insertion rod is inserted into the insertion hole; in the idle state, the insertion rod is disengaged from the insertion hole.

[0018] According to one embodiment of the present invention, the limiting member includes a first ring and a second ring, the first ring is slidably mounted on the outside of the transmission sleeve, the first ring is provided with the limiting portion, the second ring is provided with a pull rod, the second ring is rotatably connected to the first ring, and the pull rod is suitable for driving the limiting member to slide to switch between the limiting state and the idle state.

[0019] According to one embodiment of the present invention, the crane also includes a first elastic return member and a second elastic return member, the first elastic member is arranged between the limiting member and the body of the driving motor, and the first elastic member is sleeved outside the transmission sleeve, and the second elastic return member is arranged between adjacent swing blocks.

[0020] According to one embodiment of the present invention, the crane further comprises:

[0021] The brake is connected to the driving motor. The brake is provided with a brake handle. The pull rod is transmission-connected to the brake handle.

[0022] According to one embodiment of the present invention, the speed limiting member is a mounting shell, and the centrifugal speed limiter is adapted to limit the rotational speed of the drum by friction between the thrown-out swinging block and the inner wall of the mounting shell;

[0023] The mounting shell is connected between the body of the driving motor and the reel, and an installation space is formed inside the mounting shell. The swing block, the limiting member and the transmission sleeve are all located in the installation space.

[0024] According to one embodiment of the present invention, a limiting member is further provided between the arm and the turntable, and the limiting member is suitable for limiting the arm from continuing to rotate downward after being lowered to a preset height.

[0025] According to one embodiment of the present invention, the crane further comprises:

[0026] A mounting base, wherein the bottom end of the turntable is rotatably mounted on the mounting base, and a second positioning member is provided between the mounting base and the turntable, wherein the second positioning member is detachably mounted on the mounting base and the turntable to enable the turntable to switch between a non-working state and a working state;

[0027] In the non-working state, the second positioning member is installed on the mounting seat and the turntable to limit the rotation of the turntable; in the working state, at least one of the mounting seat and the turntable is disassembled from the second positioning member to release the limit on the turntable.

[0028] An assembly part is provided on the turntable or the mounting seat. When the second positioning part is removed from the mounting seat and the turntable, the second positioning part is suitable for fitting on the assembly part.

[0029] According to one embodiment of the present invention, the crane further comprises an electric control box, in which a humidity sensor, a heater and a heating controller are arranged. The humidity sensor is connected to the heating controller, and the heating controller is connected to the heater via a control switch.

[0030] An offshore platform according to an embodiment of the second aspect of the present invention includes:

[0031] The offshore platform crane according to the embodiment of the first aspect of the present invention;

[0032] The platform body is installed on the crane.

[0033] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 1 is a schematic structural diagram of a hoisting device provided by an embodiment of the present invention;

[0036] Figure 2 It is along Figure 1 Cross-sectional view along line AA;

[0037] Figure 3 This is one of the structural diagrams of the position limiting member provided in an embodiment of the present invention;

[0038] Figure 4 This is the second structural diagram of the position limiting member provided by an embodiment of the present invention;

[0039] Figure 5 1 is a schematic structural diagram of a centrifugal speed governor provided by an embodiment of the present invention;

[0040] Figure 6 1 is a structural diagram of a crane provided by an embodiment of the present invention;

[0041] Figure 7 1 is a schematic structural diagram of a crane provided by an embodiment of the present invention when the boom is in a non-working state;

[0042] Figure 8 1 is a schematic structural diagram of a crane provided by an embodiment of the present invention in a working state of the boom;

[0043] Figure 9 1 is a schematic structural diagram of a crane provided by an embodiment of the present invention when the turntable is in a non-working state;

[0044] Figure 10 1 is a schematic structural diagram of a crane provided by an embodiment of the present invention in a working state of a turntable;

[0045] Figure 11 1 is a schematic diagram of a partial structure of a crane provided in an embodiment of the present invention;

[0046] Figure 12 It is a structural diagram of a wireless remote controller provided by an embodiment of the present invention.

[0047] Reference numerals:

[0048] 01, arm; 011, matching hole; 012, working end; 013, installation end;

[0049] 02, turntable; 021, positioning hole; 022, mounting plate; 023, first positioning member; 024, limiting rope; 025, first locking plate; 0251, first limiting hole; 026, assembly ring; 027, second positioning member;

[0050] 03, mounting seat; 031, second locking plate; 0311, second limiting hole;

[0051] 04, lifting rope; 06, lifting hook; 07, hoisting device; 11, driving motor; 111, driving end; 12, brake; 121, brake handle; 21, reel; 22, rotating shaft; 23, transmission sleeve; 24, first elastic return member;

[0052] 3. Centrifugal speed governor; 31. Drive shaft; 32. Throw block; 321. Insertion hole; 33. Second elastic return member; 4. Limiting member; 41. First collar; 42. Second collar; 43. Insertion rod; 44. Pull rod; 5. Mounting housing; 51. Mounting space;

[0053] 6. Anti-loose rope protection device; 7. Slewing system; 71. Slewing motor; 72. Slewing bearing; 81. Electric control box; 82. Floodlight; 83. Boom; 84. Sound and light alarm; 85. Lifting height limiter; 9. Wireless remote control. DETAILED DESCRIPTION

[0054] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0055] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0056] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0057] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0058] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0059] The following describes a crane according to a first aspect of the present invention with reference to the accompanying drawings.

[0060] like Figures 1 to 6As shown, the crane according to the embodiment of the present invention includes a boom 01 and a hoisting device 07. The hoisting device 07 includes a power component, a drum 21, a centrifugal speed governor 3 and a limiter 4.

[0061] The power components include a drive motor 11 and a brake 12. The brake 12 is used to brake the drive motor 11. The brake 12 and the drive motor 11 are electrically connected and can function as a single unit, such as a commercially available brake motor with a braking function. The drive end 111 of the drive motor 11 is in driving connection with the rotating shaft 22 of the reel 21. The drive motor 11 drives the reel 21 to rotate, achieving the hoisting function.

[0062] The centrifugal speed limiter 3 includes a transmission shaft 31, a throw block 32 and a speed limiting member (such as the mounting shell 5 described below). The transmission shaft 31 is transmission-connected to the rotating shaft 22 of the reel 21. The centrifugal speed limiter 3 is suitable for limiting the rotation speed of the reel 21 through the friction between the thrown throw block 32 and the speed limiting member.

[0063] The limiting member 4 is movable relative to the centrifugal speed governor 3 to switch between a limiting state and an idle state; in the limiting state, the limiting member 4 cooperates with the swing block 32 of the centrifugal speed governor 3 to limit the swinging of the swing block 32; in the idle state, the limiting member 4 disengages from the swing block 32 of the centrifugal speed governor 3 to release the restriction on the swing block 32.

[0064] The specific working principle and working process of the crane according to the embodiment of the present invention are as follows:

[0065] When the crane is in normal working condition, the limiter 4 cooperates with the swing block 32 of the centrifugal speed limiter 3. The limiter 4 limits the swing block 32 from being thrown out to turn off the speed limiting function of the centrifugal speed limiter 3. At this time, the drive motor 11 can drive the drum 21 to rotate normally, and realize the rising and falling of the material by controlling the retraction and release of the hoisting rope 04 on the drum 21.

[0066] When an emergency occurs during crane operation, such as a power outage or a crane malfunction, and the material hangs in mid-air and cannot fall normally, the operator controls the limiter 4 to move relative to the centrifugal governor 3, disengaging the limiter 4 from the centrifugal governor 3's throw-off block 32. The limiter 4 releases the hold on the throw-off block 32, and the brake 12 subsequently releases the brake on the drive motor 11. Under the weight of the material itself, the material descends, and the material rotates the drum 21 via the sling 04. The drum 21, in turn, rotates the centrifugal governor 3 via the rotating shaft 22. When the material's descending speed reaches the set speed, the throw-off block 32 of the centrifugal governor 3 is ejected by centrifugal force, contacting and rubbing against the governor. The friction between the throw-off block 32 and the governor reduces the speed of the drum 21, thereby decelerating the material during its descent.

[0067] When the material descends and lands smoothly on the platform or transport ship, the limit member 4 can be switched to the limit state by elastic reset, automatic control or manual control. At this time, the limit member 4 cooperates with the swing block 32 of the centrifugal speed limiter 3. The limit member 4 limits the swinging of the swing block 32 to turn off the speed limiting function of the centrifugal speed limiter 3, so that the centrifugal speed limiter 3 will not be opened when the crane is working normally, and the crane will not be affected by the speed limit caused by the centrifugal speed limiter 3 when it is opened.

[0068] According to the crane of the embodiment of the present invention, Figure 7 and Figure 8 As shown, the crane also includes a turntable 02, which is provided with a positioning hole 021. A first positioning member 023 is detachably inserted into the positioning hole 021. The boom 01 is provided with a mating member (such as the mating hole 011). The turntable 02 and the boom 01 are rotatably connected via the hoisting device 07. The first positioning member 023 is adapted to pass through the positioning hole 021 and engage with the mating member to limit the rotation of the boom 01.

[0069] The boom 01 is rotatable relative to the turntable 02, thereby enabling adjustment of the height of the boom 01. Thus, when a maintenance worker needs to lower the boom 01 for maintenance, the worker can remove the first positioning member 023 from the positioning hole 021, thereby lowering the boom 01. This eliminates the need for auxiliary equipment during maintenance, saving maintenance time, improving work efficiency, and avoiding safety risks for personnel during maintenance.

[0070] In summary, according to the crane embodiment of the present invention, the coordinated structure of the centrifugal speed limiter 3 and the limiter 4 allows the material to land safely and smoothly in an emergency. For example, when the material is hoisted in mid-air and a power outage or crane failure suddenly occurs, the brake 12 is closed to allow the material to continue falling, and the limiter 4 is moved to release the restriction on the swing block 32, so that the material can be decelerated by the centrifugal speed limiter 3 when the falling speed is too high, so that the material can be dropped to the platform or transport ship at a controllable speed.

[0071] In this way, on the one hand, the material can also land normally in an emergency, avoiding the dangerous factors brought about by the material hovering in the air for a long time. On the other hand, the falling speed of the material is within a controllable range, thereby avoiding other dangers caused by the material falling too fast, and improving the emergency handling performance and safety performance of the device.

[0072] In addition, the first positioning member 023 can fix the boom 01 when the boom 01 lifts materials, ensuring stable installation between the boom 01 and the turntable 02. When the boom 01 needs maintenance, the height of the boom 01 can also be lowered by removing the first positioning member 023, thereby facilitating manual maintenance of the boom 01.

[0073] According to some embodiments of the present invention, the crane further includes a mounting base 03, a boom 01 mounted on a turntable 02, a turntable 02 rotatably mounted on the mounting base 03, a mounting base 03 mounted on a platform of an offshore platform, and a hoisting device 07 mounted between the boom 01 and the turntable 02. A hoisting rope 04 is wound around a drum 21, and the hoisting rope 04 extends along the boom 01 to the end of the boom 01 and is connected to a hook 06.

[0074] like Figure 1 As shown, according to some embodiments of the present invention, the power component can be a brake motor, which includes a drive motor 11 for driving and a brake 12 for braking. The brake 12 is provided with a brake handle 121 extending outside the housing. The user can directly open and close the brake 12 by pulling the brake handle 121. Of course, the present invention does not impose any special restrictions on the specific structure of the power component, and the driver can also realize the opening and closing of the braking function through other operating methods.

[0075] After the brake function of the brake 12 is turned on and off, in order to switch the limiter 4 from the restricted state to the idle state, the user can directly manually move the limiter 4, or the user can use a driving member such as a motor to automatically control the limiter 4, or the user can manually operate the pull rod 44 provided on the limiter 4 to control the limiter 4. Of course, the above embodiments are only some of the many embodiments of the present invention and do not constitute a specific limitation on the limiter 4 of the present invention.

[0076] The process of the limiting member 4 switching from the limiting state to the idle state is as follows: the limiting member 4 moves in a direction away from the swing block 32, the limiting member 4 and the swing block 32 are disengaged, and the swinging movement of the swing block 32 is no longer restricted. The process of the limiting member 4 switching from the idle state to the limiting state is as follows: the limiting member 4 moves in a direction toward the swing block 32, the limiting member 4 and the swing block 32 come into contact and cooperate with each other, and the swinging movement of the swing block 32 is restricted.

[0077] It should be noted that, during the process of the limiting member 4 switching between the two states, the movement form of the limiting member 4 may be linear movement, rotational movement or other movement forms, and the present invention does not impose any special limitation thereto.

[0078] According to some embodiments of the present invention, the driving end 111 of the driving motor 11 is connected to the rotating shaft 22 of the reel 21. The limiting member 4 and the centrifugal speed limiter 3 may also be arranged on the side of the reel 21 away from the driving motor 11, or on the side of the reel 21 close to the driving motor 11. In addition, the present invention does not specifically limit the connection relationship between the limiting member 4 and the driving motor 11 and the reel 21. For example, in one embodiment, the limiting member 4 may have no connection relationship with either the driving end 111 or the rotating shaft 22, but may be installed on other supporting structures to achieve its own mobility relative to the centrifugal speed limiter 3. In another embodiment, the limiting member 4 may be movably installed on the driving end 111 or the rotating shaft 22 to achieve its own mobility relative to the centrifugal speed limiter 3.

[0079] like Figure 2 As shown, in one embodiment of the present invention, the driving end 111 is connected to the rotating shaft 22 through a transmission sleeve 23 , the limiting member 4 is slidably sleeved outside the transmission sleeve 23 , and the transmission shaft 31 is fixedly sleeved outside the transmission sleeve 23 .

[0080] The limiting member 4 is provided with a limiting portion (such as the insertion rod 43 below), and the swing block 32 is provided with a matching portion (such as the socket 321 below). The limiting portion and the matching portion are arranged relative to each other, and the limiting member 4 is suitable for sliding along the length direction of the transmission sleeve 23 to drive the limiting portion to disengage from or match with the matching portion.

[0081] In this embodiment, the limiting member 4 and the centrifugal speed governor 3 are both sleeved on the transmission sleeve 23, which is located between the body of the drive motor 11 and the drum 21. When the limiting member 4 slides in a direction away from the centrifugal speed governor 3, the engagement between the limiting portion and the mating portion is released, and the throwing block 32 can be thrown out under the centrifugal force of the rotating shaft 22 of the drum 21, thereby achieving speed limitation through friction with the speed limiting member. When the limiting member 4 slides in a direction toward the centrifugal speed governor 3, the limiting portion and the mating portion contact and engage with each other, and the throwing block 32 cannot be thrown out, and the drum 21 can rotate normally under the drive of the drive motor 11.

[0082] In this way, on the one hand, the centrifugal speed limiter 3 and the limiter 4 are both installed between the body of the drive motor 11 and the drum 21, and the structure of the hoisting device 07 is more compact, which can minimize the volume of the hoisting device 07; on the other hand, by installing the limiter 4 and the centrifugal speed limiter 3 on the transmission sleeve 23, not only the structural stability of the device is guaranteed, but also the stability of the limiter 4 during the sliding process is guaranteed. In addition, the transmission sleeve 23 can also guide the sliding of the limiter 4.

[0083] In some embodiments, the matching structure between the limiting portion and the matching portion can be a baffle structure, a shaft hole structure, an adhesive structure, or a magnetic structure, etc. For example, the limiting portion is a baffle, and the outer peripheral surface of the swing block 32 forms a matching portion, and the baffle stops on the swinging path of the swing block 32 (i.e., the outer peripheral surface of the swing block 32), thereby limiting the swinging of the swing block 32; or, the limiting member 4 is a shaft, and the matching portion is a hole, and the shaft is inserted into the hole to limit the swinging of the swing block 32; or, both the limiting portion and the matching portion are magnetically attractive parts, and when the limiting portion and the matching portion are in contact, the magnetic force limits the swinging movement of the swing block 32.

[0084] Of course, the above embodiments are only some of the various embodiments of the present invention, and do not constitute a specific limitation on the limiting portion and the matching portion of the present invention. The limiting portion and the matching portion may also adopt other structural forms.

[0085] like Figures 1 to 6 As shown, in one embodiment of the present invention, one of the limiting portion and the matching portion is a rod 43, and the other of the limiting portion and the matching portion is a socket 321. In the limiting state, the rod 43 is inserted into the socket 321; in the idle state, the rod 43 is disengaged from the socket 321.

[0086] In this way, the matching structure between the socket 321 and the insertion rod 43 is stable and simple. In this embodiment, the limiting function of the limiting member 4 on the swing block 32 can be realized by simply adding rods and holes, which is convenient for the processing and manufacturing of the device and has low cost.

[0087] like Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the limiting member 4 includes a first ring 41 and a second ring 42. The first ring 41 is slidably mounted outside the transmission sleeve 23 and is in transmission connection with the transmission sleeve 23. The first ring 41 is provided with a limiting portion.

[0088] The second collar 42 is rotatably connected to the first collar 41 . A pull rod 44 is provided on the second collar 42 . The pull rod 44 is suitable for driving the limiting member 4 to slide so as to switch between the limiting state and the idle state.

[0089] In this embodiment, the limiting portion is the insertion rod 43 and the matching portion is the insertion hole 321 as an example for description. In the specific operation process of the crane, the movement process of the limiting member 4 is as follows:

[0090] When the crane is operating normally, the insertion rod 43 on the first collar 41 is inserted into the insertion hole 321 of the swing block 32, and the drum 21 rotates normally under the drive motor 11. As a result, the rotating shaft 22 of the drum 21 drives the centrifugal speed governor 3 to rotate, and the centrifugal speed governor 3 drives the first collar 41 to rotate. During the rotation of the centrifugal speed governor 3, the first collar 41 rotates relative to the second collar 42, while the second collar 42 does not rotate. Therefore, the pull rod 44 connected to the second collar 42 does not rotate either, making it easier for the user to control the limiter 4 by manipulating the pull rod 44.

[0091] In an emergency such as a power outage or malfunction of the crane, the user can pull the pull rod 44, which causes the second ring 42 and the first ring 41 to slide on the transmission sleeve 23, disengaging the socket 321 on the first ring 41 from the socket 321 on the swing block 32. The material's own weight drives the drum 21 to rotate, further driving the centrifugal speed governor 3. At this time, the first ring 41 and the second ring 42 do not rotate, while the swing block 32 is thrown out by the centrifugal force and rubs against the speed limiter, thereby achieving speed limiting.

[0092] like Figure 1 As shown, according to one embodiment of the present invention, the brake 12 is provided with a brake handle 121, and the pull rod 44 is in transmission connection with the brake handle 121. In this way, the brake handle 121 can not only control the brake 12, but also control the limiter 4. Thus, the user can simultaneously control the brake 12 and the limiter 4 by simply manipulating the movement of the brake handle 121, thereby improving the user experience and making the operation convenient and one-step.

[0093] In one embodiment, when an emergency such as a power outage or failure occurs in the crane, the material may be suspended in mid-air by the lifting rope 04. At this time, in order to ensure a smooth fall of the material, the operator can perform the following operations: the operator pulls the brake handle 121 in the direction away from the centrifugal speed limiter 3, so that the brake handle 121 drives the limiter 4 to slide in the direction away from the swing block 32 until the rod 43 disengages from the socket 321. At this time, the limiter 4 releases the limit on the swing block 32. Subsequently, the operator manually lowers the brake handle 121 to release the brake 12 on the drive motor 11. The material moves downward under the action of its own weight. The material drives the centrifugal speed limiter 3 to rotate through the reel 21, and the swing block 32 is thrown out and rubs against the speed limiter, ultimately achieving speed limiting of the material during the descent.

[0094] like Figure 2 As shown, according to one embodiment of the present invention, the hoisting device 07 further includes a first elastic reset member 24. The first elastic reset member 24 is connected to the limiting member 4 and is suitable for providing a force for the limiting member 4 to reset to the limited state.

[0095] In this way, on the one hand, when the crane is in normal working condition, the first elastic reset member 24 can apply elastic force to the limit member 4, so that in the absence of external force intervention, the limit member 4 and the swing block 32 can always maintain a coordinated state, avoiding the centrifugal speed limiter 3 from limiting the speed when the crane is working normally, thereby ensuring the normal operation of the crane; on the other hand, the first elastic reset member 24 can also help the limit member 4 to automatically reset from the idle state to the limited state, thereby ensuring the normal operation of the crane next time.

[0096] like Figure 2 As shown, in a specific embodiment, the limiter 4 and the centrifugal speed governor 3 are both mounted on the transmission sleeve 23. The first elastic return member 24 is a spring, which is disposed between the limiter 4 and the body of the drive motor 11 and is mounted outside the transmission sleeve 23. One end of the spring abuts or is connected to the body of the drive motor 11, and the other end abuts or is connected to the limiter 4. In the limited state, the spring can be in a compressed state or a free state.

[0097] like Figure 2 As shown, according to one embodiment of the present invention, a mounting housing 5 is connected between the body of the drive motor 11 and the reel 21. An mounting space 51 is formed inside the mounting housing 5, and the centrifugal speed governor 3, the limiting member 4 and the transmission sleeve 23 are all located in the mounting space 51.

[0098] In this way, the mounting housing 5 can enclose components such as the drive end 111, the rotating shaft 22, the stopper 4, and the centrifugal speed governor 3 within the mounting space 51, reducing or even preventing adverse external factors from interfering with the working process of the components, and improving the overall aesthetics and structural integrity of the device. For example, the mounting housing 5 is cylindrical, with one end of the mounting housing 5 mounted on the body of the drive motor 11 and the other end of the mounting housing 5 mounted on the reel 21.

[0099] In one embodiment, the structure of the centrifugal speed limiter 3 provided in the hoisting device 07 of the present invention may be substantially the same as the structure of the existing centrifugal speed limiter 3 in the related art. Therefore, the structure of the centrifugal speed limiter 3 will not be repeatedly introduced here. The difference between the centrifugal speed limiter 3 of this embodiment and the centrifugal speed limiter 3 in the related art is that the centrifugal speed limiter 3 of this embodiment is additionally provided with a matching portion structure.

[0100] Of course, in another embodiment, the centrifugal speed governor 3 of the present invention can also be further improved on the basis of the existing centrifugal speed governor 3. Specifically, Figure 2 and Figure 5 As shown, the inner wall of the mounting shell 5 relative to the swing block 32 constitutes a speed limiting component, and the centrifugal speed limiter 3 is suitable for limiting the rotation speed of the reel 21 through the friction between the swing block 32 and the inner wall of the mounting shell 5.

[0101] In this way, the swing block 32 limits the speed of the falling material through friction with the inner wall of the mounting shell 5, thereby simplifying the structure of the centrifugal speed limiter 3 and eliminating the need for additional speed limiters, so that the mounting shell 5 integrates the functions of the speed limiter and the shell.

[0102] like Figure 5 As shown, according to one embodiment of the present invention, the centrifugal speed limiter 3 includes at least two swing blocks 32, and a second elastic reset member 33 is provided between each two adjacent swing blocks 32. The second elastic reset member 33 can realize the reset of the swing block 32 from being thrown out to being retracted, wherein the second elastic reset member 33 can be a spring.

[0103] Each swing block 32 is provided with a matching portion, and the limiting member 4 is provided with at least two limiting portions, and each matching portion corresponds to one limiting portion.

[0104] In this way, after the centrifugal speed governor 3 is swung out, multiple swing blocks 32 simultaneously act as speed limiters, further achieving speed limit during the material descent process. In addition, in the limited state, multiple limiters 4 can simultaneously limit multiple swing blocks 32, ensuring the normal operation of the crane. For example, two swing blocks 32 are symmetrically provided on both sides of the transmission shaft 31, and each swing block 32 is provided with a socket 321.

[0105] like Figure 7 and Figure 8 As shown, the crane according to an embodiment of the present invention includes a turntable 02 and a boom 01.

[0106] The turntable 02 is provided with a positioning hole 021, and a first positioning member 023 is detachably inserted into the positioning hole 021; the arm 01 is provided with a matching member, and the arm 01 is rotatably mounted on the turntable 02 to be suitable for switching between a working state and a non-working state.

[0107] like Figure 8 As shown, in the working state, the first positioning member 023 is inserted into the positioning hole 021, and the first positioning member 023 cooperates with the matching member (such as the matching hole 011) to fix the arm 01; Figure 7 As shown, in the non-working state, the first positioning member 023 disengages from the matching member (such as the matching hole 011) to release the fixation of the arm 01, and the height of the arm 01 in the non-working state is lower than the height of the arm 01 in the working state.

[0108] In the crane according to the embodiment of the present invention, boom 01 is rotatable relative to turntable 02, thereby enabling boom 01 to be lowered for maintenance. Thus, when a maintenance worker is repairing boom 01, they can remove first positioning member 023 from positioning hole 021, thereby lowering boom 01. This eliminates the need for auxiliary equipment during the maintenance process, saving maintenance time, improving work efficiency, and avoiding safety risks for personnel during the maintenance process.

[0109] In the prior art, cranes installed on offshore platforms typically use fixed-arm booms. For fixed-arm booms, the height between the wall and the wind turbine tower platform is relatively high, typically exceeding 2.5 meters. This makes maintenance of the lifting rope and boom head difficult. Currently, most technologies utilize ladders or other auxiliary facilities similar to lifting platforms to accomplish this task. However, using auxiliary facilities has the following drawbacks: first, there are certain safety risks; second, it increases maintenance costs.

[0110] In order to solve the above technical problems, the present invention proposes an offshore platform crane, which has two states: one is the working state in which the boom 01 is fixed on the turntable 02, and the other is the non-working state in which the height of the boom 01 is reduced. In the working state, the boom 01 is stably fixed on the turntable 02 by the cooperation between the first positioning member 023 and the positioning hole 021 and the matching member. When the maintenance personnel need to perform maintenance on the user, the maintenance personnel can pull the first positioning member 023 out of the positioning hole 021. At this time, the first positioning member 023 is disengaged from the matching member. Since there is no restriction of the first positioning member 023 between the boom 01 and the turntable 02, the boom 01 can be reduced in height relative to the turntable 02. At this time, the maintenance personnel can adjust the boom 01 to a suitable height, so that the boom 01 can be repaired without the help of auxiliary equipment.

[0111] According to some embodiments of the present invention, the mating member may be a hole, slot, protrusion, or baffle, and the present invention is not particularly limited thereto. As long as the first positioning member 023 can cooperate with the mating member to secure the boom 01 to the turntable 02, the arrangement will be satisfactory. For example, the mating member may be a baffle provided on the boom 01. In the operating state, the first positioning member 023 abuts against the baffle, thereby limiting the height reduction of the boom 01. In the non-operating state, the first positioning member 023 is removed, allowing the boom 01 to be lowered relative to the turntable 02.

[0112] like Figure 7 As shown, according to one embodiment of the present invention, the matching piece is a matching hole 011, as shown in FIG. Figure 8 As shown, in the working state, the first positioning member 023 is inserted into the positioning hole 021 and the matching hole 011; Figure 7As shown, in the non-operating state, the first positioning member 023 is disengaged from the matching hole 011. In this way, when the first positioning member 023 is engaged in the positioning hole 021 and the matching hole 011, the fixed state between the arm 01 and the turntable 02 is more stable, preventing the arm 01 from rotating during operation, and other malfunctions, thereby enhancing the structural stability.

[0113] In some embodiments, the number of positioning holes 021 and matching holes 011 can be one, two or more, and the matching hole 011 can be located at the front end, rear end or middle part of the arm 01. The present invention does not impose any special restrictions on the number and setting positions of the above-mentioned positioning holes 021 and matching holes 011, as long as the positions of the positioning holes 021 and matching holes 011 correspond to each other.

[0114] In one embodiment of the present invention, there are multiple positioning holes 021, multiple matching holes 011, and multiple first positioning members 023, and each of these holes corresponds one-to-one to the other. Accordingly, there are multiple first positioning members 023. In operation, the multiple first positioning members 023 are each inserted into the multiple positioning holes 021 and multiple matching holes 011 in a one-to-one correspondence. This enhances the crane's structural stability during the lifting of heavy objects by the boom 01, further preventing problems such as the boom 01 rotating.

[0115] In one embodiment, when there are multiple positioning holes 021 and / or matching holes 011 , the crane can also achieve a multi-level adjustment process of the boom 01 height through the coordination between different positioning holes 021 and matching holes 011 .

[0116] In addition, when the crane is switched from the working state to the non-working state, the maintenance personnel can also re-insert the first positioning member 023 into the positioning hole 021 and the matching hole 011, thereby fixing the boom 01 at the maintenance height.

[0117] like Figure 8 As shown, according to one embodiment of the present invention, a restraining member is further provided between boom 01 and turntable 02. When not in operation, the restraining member is adapted to restrict boom 01 from further downward rotation. This allows boom 01 to be secured after descending to the maintenance height, ensuring the safety of maintenance personnel during the repair process and preventing boom 01 from falling and posing a personal hazard to the operator.

[0118] In some embodiments, the limiting member may be a rope connecting the boom 01 and the turntable 02; or, the limiting member may also include two mutually cooperating limiting members 4, one limiting member 4 being fixed on the boom 01, and the other limiting member 4 being fixed on the turntable 02. For example, the two limiting members 4 are two mutually cooperating limiting protrusions. When the boom 01 descends to the maintenance height, the two limiting protrusions stop each other to limit the continued falling of the boom 01.

[0119] like Figure 7 and Figure 8 As shown, according to one embodiment of the present invention, the limiting member includes a limiting rope 024, one end of the limiting rope 024 is connected to the boom 01, and the other end is connected to the turntable 02. Figure 8 As shown, in the working state, the limiting rope 024 is in a relaxed state; Figure 7 As shown, in the non-working state, the limiting rope 024 is in a tensioned state.

[0120] In this embodiment, the limiting rope 024 is in a relaxed state when in operation. Therefore, when the boom 01 is released from its fixed position, the boom 01 can rotate relative to the turntable 02 to lower its position. After the boom 01 is lowered to a suitable height, the limiting rope 024 is tightened, preventing the boom 01 from further downward rotation. Consequently, the boom 01 is restricted to the maintenance height to facilitate maintenance by maintenance personnel. For example, the limiting rope 024 can be a suspension rope 04, a nylon rope, or other similar rope.

[0121] In one embodiment of the present invention, multiple limiting ropes 024 are provided. In the non-operating state, these limiting ropes 024 are spaced apart along the width of the boom 01. The width of the boom 01 refers to the direction from one mounting plate 022 of the turntable 02 to the other mounting plate 022. Thus, in the non-operating state, the multiple limiting ropes 024 can simultaneously tighten the boom 01, ensuring its stability and preventing it from falling during maintenance.

[0122] Of course, the above embodiments are only some of the many embodiments of the present invention, and do not constitute specific limitations on the limiting member of the present invention. The limiting member may also adopt other structures to achieve the limitation of the arm 01.

[0123] like Figure 7As shown, according to one embodiment of the present invention, the mounting end 013 of the boom 01 is connected to the turntable 02 via a hoisting component. The hoisting component includes a suspension rope 04, the end of which is mounted on the working end 012 of the boom 01 and connected to a hook 06. For example, the hoisting component includes a drum 21 (not shown) and a motor (not shown) that drives the drum 21. The suspension rope 04 is wound around the drum 21. The connection between the boom 01 and the turntable 02 via the drum 21 simultaneously realizes the retraction and extension of the suspension rope 04 and the rotation between the boom 01 and the turntable 02.

[0124] like Figure 7 As shown, according to one embodiment of the present invention, the mating component is provided on the mounting end 013 of the boom 01. For example, one end of the boom 01 is the working end 012, and the hook below the working end 012 is used to lift cargo. The other end of the boom 01 is the mounting end 013, which is rotatably connected to the turntable 02. The mating component is provided on one side of the mounting end 013 of the boom 01. This prevents interference between the mating component and other components and ensures stable cooperation between the first positioning member 023 and the mating component during operation.

[0125] like Figure 8 As shown, according to one embodiment of the present invention, turntable 02 includes two opposing mounting plates 022, with arm 01 mounted between the two mounting plates 022. Each mounting plate 022 is provided with corresponding positioning holes 021. Thus, the two mounting plates 022 on either side of arm 01 enable stable mounting of arm 01. Furthermore, in normal operation, first positioning members 023 penetrate through positioning holes 021 on either side and engage with mating members, making the mounting structure of arm 01 and turntable 02 more stable and secure.

[0126] like Figure 9 and Figure 10 As shown, the crane according to the embodiment of the present invention further includes a mounting seat 03.

[0127] One end of the turntable 02 is rotatably mounted on the mounting seat 03, and the other end of the turntable 02 is suitable for connecting to the arm 01. A second positioning member 027 is also provided between the mounting seat 03 and the turntable 02. The second positioning member 027 is detachably mounted on the mounting seat 03 and the turntable 02, so as to enable the turntable 02 to switch between a non-working state and a working state.

[0128] In the non-working state, the second positioning member 027 is installed on the mounting seat 03 and the turntable 02 to limit the rotation of the turntable 02; in the working state, at least one of the mounting seat 03 and the turntable 02 is disassembled from the second positioning member 027 to release the limit on the turntable 02.

[0129] According to the crane of an embodiment of the present invention, when the boom 01 is in a non-working state, the second positioning member 027 is fixed between the mounting seat 03 and the turntable 02. At this time, the rotation of the turntable 02 relative to the mounting seat 03 is restricted by the second positioning member 027, and the turntable 02 can be locked on the mounting seat 03, thereby preventing the turntable 02 and the boom 01 from moving under the action of wind load, and preventing the turntable 02 and the boom 01 from rotating unnecessary when the machine is shut down for a long time.

[0130] like Figure 9 and Figure 10 As shown, according to one embodiment of the present invention, a rotary system 7 is provided between the mounting seat 03 and the turntable 02 . The rotary system 7 includes a rotary motor 71 and a rotary support 72 . The rotary support 72 includes a worm gear and a worm that mesh with each other.

[0131] In the prior art, offshore platform cranes, when not in operation and for extended periods, rely solely on the self-locking function of the worm gear structure in the slewing mechanism to prevent boom swing under wind loads. Prolonged wind loads can cause severe wear on the worm gear and increase its clearance, severely impacting the self-locking effect and reducing the slewing mechanism's service life.

[0132] like Figure 9 and Figure 10 As shown, to address the aforementioned technical issues, the offshore platform crane of the present invention is provided with a second positioning member 027 that is detachable from the turntable 02 and mounting seat 03. Thus, when the crane's boom 01 is shut down for an extended period or is in an inoperative state, the operator can install the second positioning member 027 on the turntable 02 and mounting seat 03, thereby locking the turntable 02. This not only effectively locks the boom 01 but also prevents it from swinging under wind loads, reduces wear on the worm gear structure within the slewing mechanism, and protects the slewing mechanism, extending its service life.

[0133] like Figure 9 and Figure 10 As shown, according to one embodiment of the present invention, a first limiting hole 0251 is provided on the turntable 02 , and a second limiting hole 0311 is provided on the mounting seat 03 , and the position of the first limiting hole 0251 corresponds to the position of the second limiting hole 0311 .

[0134] In the non-working state, the second positioning member 027 is inserted into the first limiting hole 0251 and the second limiting hole 0311 ; in the working state, the second positioning member 027 is separated from at least one of the first limiting hole 0251 and the second limiting hole 0311 .

[0135] In this embodiment, the specific working process is as follows: When the arm 01 is in normal working condition, the turntable 02 needs to drive the arm 01 to rotate. At this time, the turntable 02 and the mounting base 03 should be in a rotatable state. The second positioning member 027 is pulled out from the first limiting hole 0251 and the second limiting hole 0311, allowing the turntable 02 to move normally.

[0136] When the boom 01 is in a non-working state or is in a long-term shutdown state, the operator inserts the second positioning member 027 into the first limiting hole 0251 and the second limiting hole 0311, so that the second positioning member 027 limits the rotation of the turntable 02, thereby fixing the turntable 02 on the mounting seat 03, and preventing the boom 01 and the turntable 02 from rotating randomly under the action of wind load.

[0137] In this way, through the cooperation between the second positioning member 027, the first limiting hole 0251 and the second limiting hole 0311, the turntable 02 is fixed in the non-working state, and can be directly improved on the basis of the existing crane structure without adding more parts. The structure is simple and easy to modify.

[0138] In some embodiments of the present invention, the second positioning member 027 can be a bolt, and correspondingly, the first limiting hole 0251 and the second limiting hole 0311 can be threaded holes; or, the second positioning member 027 can be a part such as a pin shaft. The present invention does not make any special restrictions on the specific structure of the second positioning member 027, as long as the second positioning member 027 can cooperate with the first limiting hole 0251 and the second limiting hole 0311.

[0139] like Figure 9 and Figure 10 As shown, according to one embodiment of the present invention, a first locking plate 025 is provided at one end of the turntable 02 adjacent to the mounting seat 03, and the first limiting hole 0251 is located on the first locking plate 025; a second locking plate 031 is provided at one end of the mounting seat 03 adjacent to the turntable 02, and the second limiting hole 0311 is located on the second locking plate 031.

[0140] Thus, by providing the first locking plate 025 and the second locking plate 031, it is convenient for the operator to remove or install the second positioning member 027. For example, the turntable 02 is arranged above the mounting seat 03, the lower end of the turntable 02 is provided with the first locking plate 025 extending horizontally outward, and the upper end of the mounting seat 03 is provided with the second locking plate 031 extending horizontally outward. The first locking plate 025 and the second locking plate 031 are arranged parallel to and opposite to each other.

[0141] According to some embodiments of the present invention, the number of the first limiting holes 0251 may be one, two, or more, and the number of the second limiting holes 0311 may also be one, two, or more, which is not specifically limited in the present invention.

[0142] In one embodiment of the present invention, the turntable 02 is provided with at least two first limiting holes 0251, all of which are spaced apart along the rotational direction of the turntable 02. The mounting base 03 is provided with a second limiting hole 0311. In this embodiment, the operator can secure the turntable 02 at different rotational positions by inserting the second positioning member 027 into different first limiting holes 0251.

[0143] In another embodiment of the present invention, the mounting base 03 is provided with at least two second limiting holes 0311, all of which are spaced apart along the rotational direction of the turntable 02. The turntable 02 is provided with a first limiting hole 0251. In this embodiment, the operator can secure the turntable 02 at different rotational positions by inserting the second positioning member 027 into different second limiting holes 0311.

[0144] In another embodiment of the present invention, the mounting base 03 is provided with at least two second limiting holes 0311, all of which are spaced apart along the rotation direction of the turntable 02. The turntable 02 is provided with at least two first limiting holes 0251, all of which are spaced apart along the rotation direction of the turntable 02. In this embodiment, on the one hand, the operator can fix the turntable 02 at different rotational positions by inserting the second positioning members 027 into different first limiting holes 0251 and different second limiting holes 0311; on the other hand, in the non-operating state, the operator can insert multiple second positioning members 027 into corresponding first limiting holes and second limiting holes 0311, respectively. In this way, through multi-point limiting, the turntable 02 can be further fixed, increasing the stability of the structure in the non-operating state.

[0145] According to one embodiment of the present invention, an assembly part is provided on the turntable 02 or the mounting seat 03. When the second positioning member 027 is separated from the first limiting hole 0251 and the second limiting hole 0311, the second positioning member 027 is suitable for fitting on the assembly part.

[0146] In this way, when the second positioning member 027 is pulled out from the first limiting hole 0251 and the second limiting hole 0311, in order to avoid the loss of the second positioning member 027, the operator can match the second positioning member 027 with the assembly part, thereby facilitating the next use of the second positioning member 027.

[0147] In some embodiments, the assembly part can be a structure such as a ring, a receiving groove, a magnetic part or an adhesive part. The present invention does not make any special limitations here, as long as the second positioning part 027 can be matched with the assembly part.

[0148] like Figure 9 and Figure 10 As shown, according to one embodiment of the present invention, the assembly member is an assembly ring 026, which is provided on the outer surface of the turntable 02. Thus, when the second positioning member 027 is pulled out of the first limiting hole 0251 and the second limiting hole 0311, the second positioning member 027 can be placed in the assembly ring 026, thereby preventing the second positioning member 027 from being lost.

[0149] A specific embodiment of a crane according to the present invention will be described below with reference to the accompanying drawings.

[0150] like Figure 6 and Figure 11 As shown, the crane includes a boom 01, an anti-loose rope protection device 6, a turntable 02, a slewing system 7, a mounting base 03, an electric control box 81, a hoisting device 07, a floodlight 82, a boom 83, a hook 06, a lifting rope 04, an audible and visual alarm light, a lifting height limiter 85, and a wireless remote control 9.

[0151] like Figure 6 and Figure 11 As shown, boom 01 is the supporting beam of the entire crane and has a box-shaped structure. A rope-loosening protection device 6 is installed on boom 01. When the rope 04 slackens, the protection device 6 triggers, causing the reel 21 to stop releasing the rope. Turntable 02 is the support connecting boom 01 to the slewing system 7. Internally, it utilizes a dual-hinged connection (including a first locating member 023 and a hoisting device 07). Boom 01 is pinned to turntable 02 via the first locating member 023 and the hoisting device 07, respectively.

[0152] like Figure 9 and Figure 10 As shown, the slewing system 7 consists of a slewing bearing 72 and a slewing motor 71. It primarily drives the rotation of the boom 01, accurately positioning materials to the storage area. The slewing system 7 can be manually rotated during power outages. When the crane is idle for extended periods, a second locating member 027 pins the turntable 02 to the mounting base 03 to prevent swinging under wind loads.

[0153] The mounting base 03 is a supporting component of the whole machine to bear the compressive stress. The mounting base 03 is a column and is made of seamless steel pipe to connect the crane and the platform body. Figure 6 and Figure 12As shown, the electrical control box 81 and wireless remote control 9 form the electrical control system of the offshore platform crane, controlling the crane's ascent, descent, and rotation functions. The electrical control box 81 is equipped with a humidity sensor, a heater, and a heating controller. The humidity sensor is connected to the heating controller, which is connected to the heater via a control switch. The humidity sensor detects the humidity within the electrical control box 81 and feeds the humidity value back to the heating controller. The heating controller compares the humidity value with a pre-set humidity value and then controls the on / off of the control switch to control the heater's operating state (heating and stopping), thereby preventing the formation of condensation within the electrical control box 81.

[0154] like Figure 6 As shown, in low-light conditions, floodlights 82 provide sufficient illumination for crane operation. The crane is equipped with two booms 83: one serves as a rescue boom 83 for evacuating personnel near the end of boom 01 in an emergency, and the other serves as an anchor boom 83, used to suspend other lifting equipment for temporary lifting of objects in the event of a crane failure. A counterweight is attached to hook 06 for suspending materials. An audible and visual alarm light is mounted on turntable 02 and is primarily used to indicate when the Automatic Overload Protection System (AOPS) is triggered.

[0155] like Figure 7 and Figure 8 The specific implementation process of crane maintenance is as follows: the operator raises the hoisting device 07 to drive the hook 06 upward, tightens the lifting rope 04, pulls out the first positioning member 023 connecting the boom 01 and the turntable 02, and then lowers the boom 01 around the rotation axis to a maintenance position by lowering the hoisting component.

[0156] like Figures 1 to 6 As shown, hoisting device 07 is the lifting and lowering drive system of the offshore platform crane. Hoisting device 07 includes power components (including drive motor 11 and brake 12), centrifugal speed limiter 3, limiter 4, drum 21 with built-in speed reducer, and mounting housing 5. Hoisting device 07 is mainly used to drive hook 06 to lift and lower materials via lifting rope 04. Hoisting device 07 also includes lifting height limiter 85, which controls the position of the crane during the lifting and lowering process.

[0157] The rotating shaft 22 of the reel 21 and the driving end 111 of the driving motor 11 are connected through the transmission sleeve 23. The mounting shell 5 connects the reel 21 and the body of the driving motor 11 respectively, and the mounting shell 5 encloses parts such as the transmission sleeve 23, the centrifugal speed limiter 3, the limiter 4, the rotating shaft 22 and the driving end 111 in the mounting space 51.

[0158] The centrifugal speed limiter 3 and the limiter 4 are sleeved on the outside of the transmission sleeve 23. The centrifugal speed limiter 3 is located on the right side of the limiter 4. A spring (i.e., a first elastic return member 24) is provided on the left side of the limiter 4. The first elastic return member 24 is respectively connected to the limiter 4 and the body of the drive motor 11.

[0159] The stopper 4 includes a first collar 41 and a second collar 42. The first collar 41 is slidably mounted on the transmission sleeve 23 and is in transmission connection with the transmission sleeve 23. The first collar 41 is provided with an insert rod 43. The second collar 42 is rotatably connected to the first collar 41 and is provided with a pull rod 44. The pull rod 44 is in transmission connection with the brake handle 121 on the brake 12.

[0160] The centrifugal speed governor 3 includes a throw block 32 and a transmission shaft 31. The inner wall of the mounting shell 5 constitutes the speed limiting component of the centrifugal speed governor 3. The throw block 32 realizes the speed limiting function through friction with the inner wall of the mounting shell 5. The throw block 32 is provided with a socket 321.

[0161] The process of implementing manual emergency load reduction on a crane is as follows: the operator pulls the brake handle 121 toward the rear of the motor, causing the pull rod 44 connected thereto to drive the limiter 4 to slide along the transmission sleeve 23, thereby disengaging the rod 43 of the limiter 4 from the socket 321 of the swing block 32. At the same time, the operator manually lowers the brake handle 121 to release the motor brake 12. At this time, the material moves downward and drives the drum 21 to rotate via the lifting rope 04 (i.e., the lifting rope 04). When the drum 21 reaches the set speed, the swing block 32 of the centrifugal speed governor 3 is swung out and rubs against the inner wall of the mounting shell 5, thereby achieving speed control. When the material is lowered onto the platform or transport ship, the operator releases the manual brake handle 121, and the spring returns the limiter 4 and pull rod 44 to their initial positions. At this time, the rod 43 is inserted into the socket 321, preventing the centrifugal speed governor 3 from opening during normal operation of the crane, and thus the crane is not affected by the speed limit when the centrifugal speed governor 3 is opened.

[0162] The offshore platform according to the second embodiment of the present invention comprises the crane according to the first embodiment and a platform body, and the crane is mounted on the platform body via a mounting seat 03 .

[0163] The above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be encompassed by the scope of the claims of the present invention.

Claims

1. An offshore platform crane, characterized in that: include: The turntable is provided with a positioning hole, wherein a first positioning member is detachably inserted into the positioning hole; The arm is provided with a matching piece, the turntable and the arm are rotatably connected through a hoisting device, and the first positioning piece is adapted to pass through the positioning hole and match the matching piece to limit the rotation of the arm; The hoisting device includes a drum, a driving motor, a centrifugal speed limiter and a limiting member, wherein the driving motor and the centrifugal speed limiter are respectively connected to the drum in a transmission manner; The limiting member is movable relative to the centrifugal speed limiter to switch between a limiting state and an idle state; in the idle state, the limiting member is disengaged from the centrifugal speed limiter, and then the brake on the drive motor is released, so that the material moves downward under the action of its own gravity, and when the descending speed of the material reaches a set speed, the centrifugal speed limiter controls the reel to decelerate; The centrifugal speed limiter includes a transmission shaft, a throw block and a speed limiting member. The transmission shaft is connected to the rotating shaft of the reel. In the limited state, the limit member cooperates with the throw block to limit the throw of the throw block; in the idle state, the limit member is disengaged from the throw block, and the friction between the thrown throw block and the speed limiting member is used to limit the rotation speed of the reel. The driving end of the driving motor is connected to the rotating shaft of the reel through a transmission sleeve, the limiting member is sleeved outside the transmission sleeve, and the transmission shaft is fixedly sleeved outside the transmission sleeve; The limiting member is provided with a limiting portion, and the swing block is provided with a matching portion. The limiting portion and the matching portion are arranged opposite to each other. The limiting member is suitable for sliding along the length direction of the transmission sleeve to drive the limiting portion to disengage from or match with the matching portion.

2. The offshore platform crane according to claim 1, characterized in that: One of the limiting portion and the matching portion is an insert rod, and the other of the limiting portion and the matching portion is a socket; In the limited state, the insertion rod is inserted into the insertion hole; in the idle state, the insertion rod is disengaged from the insertion hole.

3. The offshore platform crane according to claim 1, characterized in that: The limiting member includes a first ring and a second ring. The first ring is slidably mounted on the outside of the transmission sleeve. The first ring is provided with the limiting portion. The second ring is provided with a pull rod. The second ring is rotatably connected to the first ring. The pull rod is suitable for driving the limiting member to slide to switch between the limiting state and the idle state.

4. The offshore platform crane according to claim 1, characterized in that: It also includes a first elastic reset member and a second elastic reset member, the first elastic member is arranged between the limit member and the body of the drive motor, and the first elastic member is sleeved outside the transmission sleeve, and the second elastic reset member is arranged between adjacent swing blocks.

5. The offshore platform crane according to claim 3, characterized in that: Also includes: The brake is connected to the driving motor. The brake is provided with a brake handle. The pull rod is transmission-connected to the brake handle.

6. The offshore platform crane according to claim 1, characterized in that: The speed limiting member is a mounting shell, and the centrifugal speed limiter is adapted to limit the rotation speed of the drum through the friction between the thrown-out swinging block and the inner wall of the mounting shell; The mounting shell is connected between the body of the driving motor and the reel, and an installation space is formed inside the mounting shell. The swing block, the limiting member and the transmission sleeve are all located in the installation space.

7. The offshore platform crane according to claim 1, characterized in that: A limiting member is further provided between the arm and the turntable, and the limiting member is suitable for limiting the arm from continuing to rotate downward after being lowered to a preset height.

8. The offshore platform crane according to any one of claims 1 to 6, characterized in that: Also includes: a mounting base, on which the bottom end of the turntable is rotatably mounted, and a second positioning member is provided between the mounting base and the turntable, wherein the second positioning member is detachably mounted on the mounting base and the turntable to enable the turntable to switch between a non-working state and a working state; In the non-working state, the second positioning member is installed on the mounting seat and the turntable to limit the rotation of the turntable; In the working state, at least one of the mounting seat and the turntable is detached from the second positioning member to release the limit on the turntable.

9. The offshore platform crane according to claim 8, characterized in that: An assembly part is provided on the turntable or the mounting seat. When the second positioning member is removed from the mounting seat and the turntable, the second positioning member is adapted to be fitted on the assembly part.

10. The offshore platform crane according to claim 8, characterized in that: It also includes an electric control box, in which a humidity sensor, a heater and a heating controller are arranged. The humidity sensor is connected to the heating controller, and the heating controller is connected to the heater via a control switch.

11. An offshore platform, characterized in that: include: The offshore platform crane according to any one of claims 1 to 10; The platform body is installed on the crane.

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