CN115010061A

CN115010061A - Marine fan hoist and mount are with large crane maintenance protective structure

Info

Publication number: CN115010061A
Application number: CN202210649199.5A
Authority: CN
Inventors: 房晓光
Original assignee: Nantong Chiding Marine Technology Co ltd
Current assignee: Nantong Chiding Marine Technology Co ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-09-06

Abstract

The invention discloses a large crane maintenance protective structure for hoisting an offshore wind turbine, and relates to the technical field of large crane maintenance protective structures. The invention comprises the following steps: the inner bottom of the suspension arm is fixedly connected with two oppositely arranged slide rails along the length direction of the suspension arm; the trolley is installed between the two sliding rails and moves along the length direction of the sliding rails, the two rotating rods are rotatably installed in the trolley in a penetrating mode, two ends of each rotating rod are fixedly connected with idler wheels which are installed in the sliding rails in a rolling mode, and a driving motor used for driving the rotating rods to rotate is installed in the trolley; the rail, quantity be two and relative setting in the both sides at the locomotive top. According to the invention, the slide rail is arranged on the suspension arm, the moving vehicle is arranged on the slide rail, so that maintenance personnel can be transported to a maintenance place through the moving vehicle, and the wind shield is arranged on the moving vehicle, so that the personnel is not required to resist strong wind for climbing, the physical consumption is reduced, the maintenance efficiency is improved, and the falling risk is reduced.

Description

Marine fan hoist and mount are with large crane maintenance protective structure

Technical Field

The invention relates to the technical field of large crane maintenance and protection structures, in particular to a large crane maintenance and protection structure for hoisting an offshore wind turbine.

Background

Wind power generation is the fastest-developing green energy technology in the world, and people have noticed some limitations on land wind energy utilization, such as large occupied area, noise pollution and the like, while land wind power plant construction is rapidly developed. Due to the abundant wind energy resources at sea and the feasibility of the current technology, the sea becomes a rapidly-developing wind power market.

A wind generating set constructed at sea is large in size generally, a large-sized special offshore crane is required to be used for lifting and mounting when the wind generating set is mounted, a suspension arm of the crane is a main pressure-bearing part, certain damage and aging are easily caused due to long-time offshore operation, a maintenance worker is required to climb to a damaged part of the suspension arm to perform maintenance operation in time, but the maintenance worker generally climbs by himself to move to the damaged part of the suspension arm at present, the crane is also located in a sea area where an offshore wind driven generator is located, the sea area has frequent strong wind weather, the worker only has one safety rope as a protection structure in the climbing and moving process, the great risk of falling still exists in the strong wind weather, the worker needs to resist the strong wind to move in the suspension arm, and the physical strength of the worker is easily and quickly consumed by the resistance of the strong wind, on one hand, the maintenance and operation efficiency is not favorable for follow-up maintenance and operation, and on the other hand, the risk of falling due to the depletion of physical strength is easy to occur, so that the invention provides the maintenance and protection structure for the large crane for hoisting the offshore wind turbine.

Disclosure of Invention

The invention aims to: the invention provides a large crane maintenance protection structure for hoisting an offshore wind turbine, and aims to solve the problems that an existing suspension arm does not have an effective safety protection structure, the risk of falling of maintenance personnel when the existing suspension arm moves on the suspension arm cannot be reduced, the suspension arm does not have a structure which can resist strong wind when the existing suspension arm moves, and the personal safety of the maintenance personnel cannot be guaranteed.

The invention specifically adopts the following technical scheme for realizing the purpose:

the utility model provides an offshore wind turbine hoist and mount are with heavy crane maintenance protective structure, includes:

the inner bottom of the suspension arm is fixedly connected with two oppositely arranged slide rails along the length direction of the suspension arm;

the trolley is installed between the two sliding rails and moves along the length direction of the sliding rails, the two rotating rods are rotatably installed in the trolley in a penetrating mode, two ends of each rotating rod are fixedly connected with idler wheels which are installed in the corresponding sliding rail in a rolling mode, a driving motor used for driving the rotating rods to rotate is installed in the trolley, and the driving motor is in transmission connection with the rotating rods through gears;

the number of the fences is two, and the fences are oppositely arranged on two sides of the top of the mobile vehicle;

the wind shielding assembly comprises a wind shielding plate hinged to one end of the upper surface of the moving vehicle, universal joints are fixedly connected to two sides of the wind shielding plate, two oppositely arranged supporting rods are hinged to the top of the moving vehicle, the overturning direction of the supporting rods faces towards the wind shielding plate, the free ends of the supporting rods are detachably connected with the universal joints, and a wind speed measuring instrument is detachably mounted on the fence;

the anti-falling assembly comprises a hanging buckle rotatably mounted at the upper end of the wind shield, a steel cable positioned right above the moving vehicle is fixedly connected in the suspension arm along the length direction of the suspension arm, and the hanging buckle is detachably hung on the steel cable;

prevent subassembly that moves back, including a plurality of limiting plates, the limiting plate is connected between two slide rails along the length direction array of slide rail, the locomotive bottom slides and runs through installs two installation pieces, two installation piece bottom all articulates there is the cardboard that is used for contradicting limiting plate wherein one side, two the free end slope of cardboard just sets up downwards and relatively, be connected with supporting spring between cardboard and the installation piece opposite face, be provided with the driving piece that is used for driving two installation pieces and reciprocates in turn in the locomotive, the bottom structure of installation piece has the spacing frame of parcel on the cardboard, and it is used for the restriction the inclination of cardboard.

Further, the equal fixedly connected with a plurality of connecting rods that are used for the support in side of davit, the slide rail is established two flat bars on a plurality of connecting rods of davit bottom side including fixed cover, two all along its length direction on parallel relative setting of flat bar and the opposite face and be constructed with the sliding tray, four edges and corners of sliding tray all are constructed with the stopper that is used for spacing gyro wheel.

Further, the locomotive includes rectangular frame, rectangular frame's top is constructed two standing grooves, standing groove upper end opening part all articulates there is the closing cap, rectangular frame top is constructed the storage tank that is located its middle part, storage tank upper end opening part can be dismantled and be connected with the screen frame.

Further, the net frame is slidably inserted into the storage groove, connecting plates are constructed on two sides of the upper surface of the net frame, the connecting plates are detachably connected with the upper surface of the rectangular frame through locking pieces, and a plurality of fixing belts used for being sleeved on feet of people are fixedly connected to the upper surface of the net frame.

Further, the top of the supporting rod is provided with a threaded column, and the free end of the universal joint is provided with a threaded hole in threaded connection with the threaded column.

Furthermore, the wind shield material is acrylic material, and the wind shield is constructed with a V-shaped frame on the side opposite to the moving vehicle.

Furthermore, four guide plates which are distributed in a rectangular shape are fixedly connected in the rectangular frame, and the installation block is vertically sleeved between the two opposite guide plates in a sliding manner.

Further, top fixedly connected with is located the installing frame under the storage tank in the rectangular frame, the driving piece is including rotating the two-way threaded rod of installing in the installing frame, fixed mounting has the rotation motor in the installing frame, the output shaft of rotation motor and the one end fixed connection of two-way threaded rod, equal thread bush is equipped with the slider on two sections symmetrical screw threads of two-way threaded rod, slider slidable mounting is in the bottom of installing frame, two the bottom of slider respectively with two install between the top of piece articulated have even board.

Further, when one of the connecting plates is in the vertical state, the mounting block connected with the connecting plate is positioned at the lower position of the rectangular frame, and the other connecting plate is in the inclined state, so that the mounting block connected with the connecting plate is positioned at the inner part of the rectangular frame.

The invention has the following beneficial effects:

1. according to the invention, the sliding rails are arranged on the suspension arm, the moving vehicle is arranged between the sliding rails, and when maintenance personnel need to maintain a certain position of the suspension arm, the maintenance personnel can be automatically transported to the position through the moving vehicle without climbing by the personnel, so that a large amount of manpower is saved, the subsequent maintenance efficiency is improved, and the risk of falling of the personnel due to excessive physical consumption is reduced.

2. According to the invention, the wind shielding assembly is arranged at one end of the mobile vehicle, so that when a person needs to use the mobile vehicle, the wind shielding plate can be turned to a vertical state, and the position of the wind shielding plate is fixed through the support rod, so that when the mobile vehicle moves towards the end part of the suspension arm, the wind in front can be shielded, the influence of the wind on maintenance personnel can be prevented, and the risk of falling of the person can be reduced.

3. According to the invention, by arranging the anti-reversing component, when the moving vehicle moves along the length direction of the suspension arm, one clamping plate can be continuously clamped with different limiting plates through the resisting force of the spring, so that the risk that the moving vehicle slips backwards is avoided, and the safety of the device is improved.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is an exploded perspective view of the present invention;

FIG. 3 is a partial perspective view of the present invention;

FIG. 4 is a schematic view of the slide rail structure of the present invention;

FIG. 5 is a cross-sectional view of a partial three-dimensional structural panel of the present invention;

FIG. 6 is an exploded perspective view of the anti-backup assembly of the present invention;

reference numerals: 1. a suspension arm; 101. a connecting rod; 2. a slide rail; 201. leveling a rod; 202. a sliding groove; 203. a limiting block; 3. a mobile vehicle; 301. a rectangular frame; 3011. installing a frame; 302. a placement groove; 303. sealing the cover; 304. a storage tank; 305. a screen frame; 3051. a connecting plate; 3052. a fastener; 3053. fixing belts; 306. a V-shaped frame; 4. a rotating rod; 5. a roller; 6. a drive motor; 7. a fence; 8. a wind shielding assembly; 801. a wind deflector; 802. a universal joint; 803. a support bar; 804. a wind speed measuring instrument; 9. a fall arrest assembly; 901. hanging and buckling; 902. a wire rope; 10. an anti-backup assembly; 1001. a limiting plate; 1002. mounting blocks; 1003. clamping a plate; 1004. a support spring; 1005. a limiting frame; 11. a drive member; 1101. a bidirectional threaded rod; 1102. rotating the motor; 1103. a slider; 1104. connecting plates; 12. a guide plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

As shown in fig. 1 to 6, a maintenance and protection structure for a large crane for hoisting an offshore wind turbine according to an embodiment of the present invention includes: the crane comprises a suspension arm 1, wherein the bottom in the suspension arm 1 is fixedly connected with two opposite slide rails 2 along the length direction of the suspension arm, the suspension arm 1 is a hoisting arm of a large-scale offshore crane and is usually arranged obliquely upwards, and the slide rails 2 are arranged along the length direction of the suspension arm 1; the movable trolley 3 is installed between the two sliding rails 2 and moves along the length direction of the sliding rails 2, the two rotating rods 4 are rotatably installed in the movable trolley 3 in a penetrating mode, two ends of each rotating rod 4 are fixedly connected with a roller 5 which is installed in each sliding rail 2 in a rolling mode, a driving motor 6 for driving each rotating rod 4 to rotate is installed in the movable trolley 3, the driving motor 6 is connected with the corresponding rotating rod 4 through gear transmission, the movable trolley 3 is arranged between the two sliding rails 2 in a sliding mode through the corresponding roller 5, the sliding rails 2 limit the movable trolley 3, the movable trolley 3 can only move along the length direction of the corresponding sliding rail 2, and the driving motor 6 can enable the movable trolley 3 to automatically operate and move so that maintenance personnel can transport the movable trolley to an appointed position after taking the movable trolley; the two fences 7 are oppositely arranged on two sides of the top of the moving vehicle 3 and used for shielding two sides of the moving vehicle 3, so that personnel can be prevented from falling from the side surface, and the safety is improved; the wind shielding assembly 8 comprises a wind shielding plate 801 hinged to one end of the upper surface of the mobile vehicle 3, universal joints 802 are fixedly connected to two sides of the wind shielding plate 801, two oppositely-arranged support rods 803 are hinged to the top of the mobile vehicle 3, the overturning direction of the support rods is arranged towards the wind shielding plate 801, the free ends of the support rods 803 are detachably connected with the universal joints 802, a wind speed measuring instrument 804 is detachably mounted on the fence 7, the wind speed measuring instrument 804 can remind people of the current wind speed before the people enter the mobile vehicle 3, if the wind speed is small, the wind shielding plate 801 does not need to be opened, convenience is improved, the wind shielding plate 801 can be overturned and fixed by detachably connecting the support rods 803 with the universal joints 802, and therefore the wind shielding plate 801 can be conveniently stored and used; the anti-falling assembly 9 comprises a hanging buckle 901 which is rotatably arranged at the upper end of the wind shield 801, a steel cable 902 which is positioned right above the moving vehicle 3 is fixedly connected in the suspension arm 1 along the length direction of the suspension arm, and the hanging buckle 901 is detachably hung on the steel cable 902; the anti-backward component 10 comprises a plurality of limiting plates 1001, the limiting plates 1001 are connected between two slide rails 2 in an array manner along the length direction of the slide rails 2, two mounting blocks 1002 are slidably arranged at the bottom of the movable vehicle 3 in a penetrating manner, clamping plates 1003 used for abutting against one side of the limiting plates 1001 are hinged at the bottoms of the two mounting blocks 1002, the free ends of the two clamping plates 1003 incline downwards and are oppositely arranged, a supporting spring 1004 is connected between the opposite surfaces of the clamping plates 1003 and the mounting blocks 1002, a driving part 11 used for driving the two mounting blocks 1002 to alternately move up and down is arranged in the movable vehicle 3, a limiting frame 1005 wrapped on the clamping plates 1003 is constructed at the bottom of the mounting blocks 1002 and used for limiting the inclination angle of the clamping plates 1003, when a suspension arm 1 of the crane is damaged, the initial position of the movable vehicle 3 is a position close to a support frame of the crane body, and personnel need to check the current wind speed through a wind speed measuring instrument 804 when entering the movable vehicle 3, if the wind speed is too high, the wind shield 801 can be turned to a vertical state, then the support rod 803 is rotated and is connected with the universal joints 802 on two sides of the wind shield 801, a triangular structure is formed between the support rod 803 and the wind shield 801 for fixing the position of the wind shield 801, then a person enters the mobile vehicle 3, a hanging buckle 901 at the upper end of the wind shield 801 is hung on a steel cable 902 of the suspension arm 1, and a safety rope on the person is also hung on the steel cable 902 synchronously, so that when the mobile vehicle 3 moves, the mobile vehicle 3 can be prevented from directly falling off after being separated from the slide rail 2, the safety is improved, the safety rope is connected with the steel cable 902, when the mobile vehicle 3 falls, the person can still be hung on the steel cable 902 through the safety rope, the safety is further improved, the personal safety of the person is ensured, the mobile vehicle 3 can gradually convey the person towards the upper end side of the suspension arm 1 through the driving motor 6, the wind shield 801 can block strong wind with relative moving direction until reaching an appointed position, so that the strong wind is prevented from directly impacting the body of a person, the physical consumption of the person is further reduced, the subsequent maintenance efficiency is improved, the risk of falling of the person due to insufficient physical strength can be avoided, in the moving process of the moving vehicle 3, the contacted limiting plate 1001 can be gradually clamped through the clamping plate 1003 on one mounting block 1002 in the anti-falling component 10, the clamping plate 1003 is obliquely arranged and is elastically deformed through the supporting spring 1004, the inclined surface of the clamping plate 1003 can be in contact dislocation with the limiting plate 1001 and can cross the limiting plate 1001 to restore the original inclined angle in the moving process of the moving vehicle 3, when the moving vehicle 3 slides, the free end of the clamping plate 1003 can abut against one side of the limiting plate 1001, and through the limiting displacement of spacing frame 1005, can carry on spacingly with the position of cardboard 1003, prevent that cardboard 1003 from continuing the upset, and then realize the rigidity to locomotive 3, prevent that it from continuing to slide down the car, improve the security of device, avoid the device because of the condition that the car bumps or falls, and set up two installation pieces 1002 and two cardboard 1003 that incline relatively, can drive two installation pieces 1002 alternate movement to locomotive 3's below through driving piece 11, when davit 1 is the horizontal state or when inclining the downward state, the setting of two cardboard 1003 can carry out the blocking of opposite direction to two moving directions of locomotive 3, increase the adaptability of device, improve the security.

As shown in fig. 4, in some embodiments, a plurality of connecting rods 101 for supporting are fixedly connected to the side surface of the suspension arm 1, the sliding rail 2 includes two flat rods 201 fixedly sleeved on the plurality of connecting rods 101 at the bottom side of the suspension arm 1, the two flat rods 201 are arranged in parallel and oppositely, and sliding grooves 202 are formed on the opposite surfaces along the length direction of the two flat rods 201, limiting blocks 203 for limiting rollers 5 are formed at four corners of the sliding grooves 202, the sliding grooves 202 are formed in the side surfaces of the flat rods 201, the rollers 5 of the mobile vehicle 3 can be limited in the sliding grooves through the limiting blocks 203, the structural stability between the mobile vehicle 3 and the sliding rail 2 is improved, the mobile vehicle 3 is prevented from slipping off the sliding rail 2, the safety of the device is improved, and the safety of a maintenance worker is guaranteed.

As shown in fig. 3 and 5, in some embodiments, the mobile vehicle 3 includes a rectangular frame 301, two placement grooves 302 are configured on the top of the rectangular frame 301, a cover 303 is hinged on an opening at the upper end of each placement groove 302 and used for storing tools to be used, the cover 303 can be used for placing the tools to be blown out by strong wind, a placement groove 304 is configured on the top of the rectangular frame 301 and located in the middle of the rectangular frame 301, a net frame 305 is detachably connected to the opening at the upper end of the placement groove 304, the two placement grooves 302 are located on two sides of the placement groove 304, and a wind deflector 801 is covered above the placement groove 304 when not in use, so that the wind deflector 801 can prevent the placement grooves 302 from being shielded by the wind deflector 801 to facilitate the taking of the tools inside the placement grooves 302, the placement grooves 304 can be provided for placing detached screws or unused components into the placement grooves 305 when a person performs maintenance work, so that the articles are prevented from being placed on the upper surface of the rectangular frame 301 and blown down by the strong wind, the screen frame 305 can be opened subsequently to clean up the internal sundries, so that the flexibility and the practicability are improved.

As shown in fig. 5, in some embodiments, the net frame 305 is slidably inserted into the storage slot 304, the connection plates 3051 are respectively configured on both sides of the upper surface of the net frame 305, the connection plates 3051 are detachably connected with the upper surface of the rectangular frame 301 through the fasteners 3052, the plurality of fixing straps 3053 for being sleeved on the feet of the person are fixedly connected to the upper surface of the net frame 305, the fasteners 3052 are the existing turnover buckles, which is convenient for the person to detach and install, and the fixing straps 3053 are arranged to cover the feet of the person when the person stands on the fixing straps 3053, so as to prevent the person from accidentally slipping or being blown off the mobile vehicle 3 by strong wind, improve the stability of the person working on the mobile vehicle 3, and reduce the risk of falling.

As shown in fig. 3 and 5, in some embodiments, a threaded column is configured at the top of the support rod 803, a threaded hole in threaded connection with the threaded column is configured at the free end of the universal joint 802, by providing the threaded hole and the threaded column, the threaded column can be in threaded connection with the threaded hole of the universal joint 802 through rotation of the universal joint 802, and the butt joint installation is convenient for supporting the wind deflector 801, and when the wind deflector 801 is not used, the wind deflector 801 can be turned over to the rectangular frame 301 for fitting placement, so that the contact area with strong wind is reduced, the resistance is reduced, and the safety is improved.

As shown in fig. 3, in some embodiments, the wind deflector 801 is made of acrylic material, and its transparent characteristic can facilitate people to observe the condition of the other side of the wind deflector 801, thereby facilitating the regulation and control of the operation of the mobile vehicle 3, and increasing the practicability, the side of the wind deflector 801 opposite to the mobile vehicle 3 is constructed with the V-shaped frame 306, the opposite side of the V-shaped frame 306 and the wind deflector 801 is a sharp corner end, and both side edges thereof can form a sharp corner connection with the side of the wind deflector 801, so as to guide the blown wind flow, reduce the resistance effect of strong wind on the wind deflector 801, and further avoid the wind deflector 801 or the mobile vehicle 3 from being damaged by strong wind.

As shown in fig. 5 to 6, in some embodiments, four guide plates 12 are fixedly connected to the rectangular frame 301, the four guide plates 12 are distributed in a rectangular shape, the mounting block 1002 is vertically slidably sleeved between two opposite guide plates 12, and the guide plates 12 are configured to guide the movement of the mounting block 1002, so that the mounting block can only move in a vertical state.

As shown in fig. 5-6, in some embodiments, a mounting frame 3011 located right below the storage slot 304 is fixedly connected to the top inside the rectangular frame 301, the driving member 11 includes a bidirectional threaded rod 1101 rotatably mounted in the mounting frame 3011, a rotating motor 1102 is fixedly mounted in the mounting frame 3011, an output shaft of the rotating motor 1102 is fixedly connected to one end of the bidirectional threaded rod 1101, two symmetrical threads of the bidirectional threaded rod 1101 are both threadedly sleeved with a sliding block 1103, the sliding block 1103 is slidably mounted at the bottom of the mounting frame 3011, connecting plates 1104 are respectively hinged between the bottoms of the two sliding blocks 1103 and the tops of the two mounting blocks 1002, when different clamping plates 1003 need to be switched to be clamped and abutted against the limiting plate 1001, the bidirectional threaded rod 1101 can be driven to rotate by the rotating motor 1102, so as to drive the two sliding blocks 1103 to move relatively, and the two connecting plates 1104 hinged between the two sliding blocks 1103 and the mounting blocks 1002, its initial state is a slope vertically, and does not keep parallel, thereby when slider 1103 produces screw-thread fit with two-way threaded rod 1101 and removes, can drive two even boards 1104 in step and carry out the upset of opposite direction, and can drive slider 1103 through the positive and negative rotation of rotating electrical machines 1102 and carry out reciprocating motion, thereby make even board 1104 drive two installation pieces 1002 respectively and carry out reciprocating of alternating, so that still can play the function of preventing swift current car when locomotive 3 switches moving direction, the security of the device is improved.

As shown in fig. 5-6, in some embodiments, when one of the connecting plates 1104 is in the vertical state to form the mounting block 1002 connected thereto to be located at a position below the rectangular frame 301, and the other connecting plate 1104 is in the inclined state to form the mounting block 1002 connected thereto to be located inside the rectangular frame 301, the two-way threaded rod 1101 rotates synchronously when the rotating motor 1102 rotates forwards, the sliding block 1103 connected with the vertical connecting plate 1104 and the other sliding block 1103 move closer to each other, at this time, the connecting plate 1104 in the vertical state becomes in the inclined state, and pulls the mounting block 1002 to ascend along the length direction of the guide plate 12, the connecting plate 1104 in the inclined state gradually turns to the vertical state, and pushes the mounting block 1002 to descend along the length direction of the guide plate 12, so as to complete the height replacement of the two mounting blocks 1002, so as to limit the clamping of the two opposite sides of the limiting plate 1001 by using different clamping plates 1003, the phenomenon of sliding in two directions can be avoided, and the risk of falling caused by collision is avoided.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an offshore wind turbine hoist and mount are with heavy crane maintenance protective structure which characterized in that includes:

the suspension arm (1), the bottom in the suspension arm (1) is fixedly connected with two opposite slide rails (2) along the length direction;

the trolley comprises a trolley (3) which is arranged between two sliding rails (2) and moves along the length direction of the sliding rails (2), two rotating rods (4) are rotatably arranged in the trolley (3) in a penetrating mode, two ends of each rotating rod (4) are fixedly connected with idler wheels (5) which are arranged in the corresponding sliding rail (2) in a rolling mode, a driving motor (6) used for driving the corresponding rotating rod (4) to rotate is arranged in the trolley (3), and the driving motor (6) is in transmission connection with the corresponding rotating rod (4) through gears;

the number of the fences (7) is two, and the fences are oppositely arranged on two sides of the top of the moving vehicle (3);

the wind shielding assembly (8) comprises a wind shielding plate (801) hinged to one end of the upper surface of the moving vehicle (3), universal joints (802) are fixedly connected to two sides of the wind shielding plate (801), two support rods (803) which are oppositely arranged are hinged to the top of the moving vehicle (3), the turning direction of the support rods is arranged towards the wind shielding plate (801), the free ends of the support rods (803) are detachably connected with the universal joints (802), and a wind speed measuring instrument (804) is detachably mounted on the fence (7);

the anti-falling assembly (9) comprises a hanging buckle (901) rotatably mounted at the upper end of the wind shield (801), a steel cable (902) positioned right above the moving vehicle (3) is fixedly connected in the suspension arm (1) along the length direction of the suspension arm, and the hanging buckle (901) is detachably hung on the steel cable (902);

the anti-reverse assembly (10) comprises a plurality of limiting plates (1001), the limiting plates (1001) are connected between the two sliding rails (2) in an array manner along the length direction of the sliding rails (2), the bottom of the moving vehicle (3) is provided with two mounting blocks (1002) in a sliding and penetrating way, the bottoms of the two mounting blocks (1002) are respectively hinged with a clamping plate (1003) used for abutting against one side of the limiting plate (1001), the free ends of the two clamping plates (1003) are arranged downwards in an inclined way and oppositely, a supporting spring (1004) is connected between the opposite surfaces of the clamping plate (1003) and the mounting block (1002), a driving piece (11) for driving the two mounting blocks (1002) to alternately move up and down is arranged in the moving vehicle (3), the bottom of the mounting block (1002) is provided with a limiting frame (1005) wrapped on a clamping plate (1003) and used for limiting the inclination angle of the clamping plate (1003).

2. The large crane maintenance protection structure for offshore wind turbine hoisting according to claim 1, wherein the side surfaces of the boom (1) are fixedly connected with a plurality of connecting rods (101) for supporting, the slide rail (2) comprises two flat bars (201) fixedly sleeved on the plurality of connecting rods (101) at the bottom side of the boom (1), the two flat bars (201) are arranged oppositely in parallel, sliding grooves (202) are formed in the opposite surfaces along the length direction of the sliding grooves, and the four corners of the sliding grooves (202) are respectively provided with a limiting block (203) for limiting the roller (5).

3. The large crane maintenance protection structure for offshore wind turbine hoisting according to claim 1, wherein the moving vehicle (3) comprises a rectangular frame (301), two placing grooves (302) are formed in the top of the rectangular frame (301), a sealing cover (303) is hinged to each opening at the upper end of each placing groove (302), a storage groove (304) is formed in the middle of the top of the rectangular frame (301), and a net frame (305) is detachably connected to each opening at the upper end of the storage groove (304).

4. The maintenance and protection structure for the large crane for hoisting the offshore wind turbine as claimed in claim 3, wherein the net frame (305) is slidably inserted into the storage tank (304), connecting plates (3051) are respectively constructed on two sides of the upper surface of the net frame (305), the connecting plates (3051) are detachably connected with the upper surface of the rectangular frame (301) through locking fasteners (3052), and a plurality of fixing straps (3053) for being sleeved on the feet of personnel are fixedly connected to the upper surface of the net frame (305).

5. The maintenance and protection structure for the large crane for hoisting the offshore wind turbine as claimed in claim 1, wherein a threaded column is formed at the top of the support rod (803), and a threaded hole in threaded connection with the threaded column is formed at the free end of the universal joint (802).

6. The maintenance and protection structure of the large crane for hoisting the offshore wind turbine as claimed in claim 1, wherein the wind screen (801) is made of acrylic material, and a V-shaped frame (306) is configured on the side of the wind screen (801) opposite to the moving vehicle (3).

7. The maintenance and protection structure for the large crane for hoisting the offshore wind turbine as claimed in claim 3, wherein four guide plates (12) are fixedly connected in the rectangular frame (301) and are distributed in a rectangular shape, and the installation block (1002) is vertically sleeved between the two opposite guide plates (12) in a sliding manner.

8. The large crane maintenance protection structure for hoisting the offshore wind turbine as claimed in claim 7, wherein a mounting frame (3011) located right below the storage groove (304) is fixedly connected to the inner top of the rectangular frame (301), the driving member (11) comprises a bidirectional threaded rod (1101) rotatably mounted in the mounting frame (3011), a rotating motor (1102) is fixedly mounted in the mounting frame (3011), an output shaft of the rotating motor (1102) is fixedly connected with one end of the bidirectional threaded rod (1101), two symmetrical threads of the bidirectional threaded rod (1101) are respectively provided with a sliding block (1103) in a threaded manner, the sliding blocks (1103) are slidably mounted at the bottom of the mounting frame (3011), and a connecting plate (1104) is hinged between the bottoms of the two sliding blocks (1103) and the tops of the two mounting blocks (1002).

9. The maintenance and protection structure for the large crane for hoisting the offshore wind turbine as claimed in claim 8, wherein when one of the connecting plates (1104) is in the vertical state, the installation block (1002) connected with the connecting plate is positioned below the rectangular frame (301), and the other connecting plate (1104) is in the inclined state, so that the installation block (1002) connected with the connecting plate is positioned inside the rectangular frame (301).