Spliced load transfer frame for offshore converter station land debugging

Abstract

The utility model provides a splicing type load transfer frame for land debugging of an offshore converter station. The splicing type load transfer frame for land debugging of the offshore converter station comprises main supporting beams, transverse connecting beams and transverse supporting beams. The transverse supporting beams and the transverse connecting beams jointly form secondary supporting beams. According to the utility model, on the land debugging site of the offshore converter station, fire welding is not needed, damage to equipment caused by fire operation is avoided, and the on-site assembling and disassembling process is simple; meanwhile, the bulk components are light in weight, medium-large hoisting equipment is not needed when the bulk components are transported from the land to the position above a high-rise platform, the overall construction process cost is lower, and an efficient and reliable solution is provided for arrangement of temporary equipment during land debugging of the offshore converter station; during assembly, the load transfer frame has the advantages that the number of the transverse connecting beams, the number of the main supporting beams and the number of the transverse supporting beams can be adjusted / increased according to existing platform main and secondary beam structures, special design and machining are not needed, and the application range is wide.

Description

Technical Field

[0001] This utility model belongs to the field of offshore wind power technology, and in particular relates to a spliced ​​load transfer frame for land commissioning of offshore converter stations. Background Technology

[0002] In recent years, the planning of offshore wind farms has trended towards large capacity and long distances, and offshore substations, as the core of wind farms, will gradually be replaced by offshore converter stations. The most obvious difference between offshore converter stations and offshore substations is their larger size and more equipment. The total weight of the offshore converter station directly affects the wharf's load-bearing capacity, ship loading, transportation, and floating installation, making it highly sensitive to overall cost control. Excessive weight can even have a disruptive impact on various stages of the construction process, necessitating a compact and lightweight design for offshore converter stations. Besides the inherent complexity and difficulty of design and construction, offshore converter stations require higher voltage levels, larger capacities, and more numerous transformers and GIS equipment. Compared to offshore substations, which require larger oil tanks and more equipment such as test transformers, control cabinets, and reactors during onshore commissioning, onshore commissioning has become a critical path and a major challenge in the construction process. Specifically:

[0003] (1) The construction schedule for offshore converter stations on land is tight. Equipment installation and the construction and loading of each layer of structure are usually carried out simultaneously. For example, for the transformer located on the fifth floor (the fifth and sixth floors are connected), its equipment installation needs to be completed before the seventh deck is capped. At the same time, since the equipment used for commissioning is large, if commissioning is carried out after it is installed on the roof, the equipment used for commissioning will be difficult to enter the transformer floor, resulting in a height difference between the commissioning equipment and the transformer / GIS equipment. This makes wiring and piping difficult during the test, and the excessive height difference may even affect the test itself.

[0004] (2) The equipment and devices used for commissioning are only used during land-based commissioning and are not permanent loads. Under the premise of compactness, it is difficult for the rooms of the offshore converter station to accommodate a large number of heavy commissioning equipment. If additional test platforms are added for such equipment, the dismantling work after commissioning must also be considered, which results in high construction costs and long construction periods. If the equipment and devices for commissioning are placed in nearby rooms without equipment, such as spare parts rooms, the structural beams need to be strengthened or the beam system adjusted, which will increase the number of permanent steel components. In addition, in practice, the selection, scheme and layout of commissioning equipment are usually later than the structural design and even later than the on-site manufacturing, which makes it difficult to modify the beam system on-site and match the layout of the commissioning equipment.

[0005] To resolve the two contradictions mentioned above, it is urgent to develop a load transfer frame for land-based commissioning of offshore converter stations, which would address the conflict between the inability to modify the beam system and the arrangement of commissioning equipment. At the same time, the fabrication process of the load transfer frame should be optimized as much as possible to reduce hot work, improve reusability, and accelerate the commissioning cycle, thus providing a solution for the land-based construction and commissioning of offshore converter stations. Utility Model Content

[0006] The purpose of this utility model is to address the problems of numerous, heavy, and difficult-to-arrange temporary equipment / devices required for land-based commissioning of offshore converter stations. Without changing the original platform structural design, it proposes a load transfer frame that can be assembled from several types of standardized prefabricated components according to requirements, which greatly improves material utilization, on-site construction efficiency, simplifies the process, and ensures reliable connections between parts.

[0007] Therefore, the above-mentioned objective of this utility model is achieved through the following technical solution:

[0008] A modular load transfer frame for land commissioning of an offshore converter station includes a main support beam, a transverse connecting beam, and a transverse support beam.

[0009] The main support beam includes square steel, end plates for sealing both ends of the square steel, and connectors set on the end plates. The connectors are used to connect two adjacent main support beams. The square steel has multiple connection ports on its side, which are used to connect transverse connecting beams and transverse support beams.

[0010] The transverse support beam and the transverse connecting beam together form a secondary support beam;

[0011] The transverse support beam includes square steel, sealing plates for sealing both ends of the square steel, pins, and connectors. The connectors are used to connect two adjacent transverse support beams or to connect a transverse support beam with a transverse connecting beam.

[0012] The transverse connecting beam includes square steel, sealing plates for sealing both ends of the square steel, and at least one self-locking device; the self-locking device is installed on the sealing plate at the end of the square steel, and the self-locking device on the transverse connecting beam cooperates with the pin on the transverse support beam in the connection port of the main support beam.

[0013] While adopting the above technical solutions, this utility model may also adopt or combine the following technical solutions:

[0014] As a preferred technical solution of this utility model: the connecting parts at both ends of the main support beam include a first connecting part and a second connecting part. Both the first connecting part and the second connecting part include three connecting plates. The three connecting plates of the first connecting part of the first main support beam in the adjacent main support beam are staggered with the three connecting plates of the second connecting part of the second main support beam so that the two cross and close and are locked by bolts.

[0015] As a preferred technical solution of this utility model: the outer surface of the connecting plate is coated with a graphene coating.

[0016] As a preferred technical solution of this utility model: the pin is provided with a first opening reinforcement, a second opening reinforcement and a cast steel lock;

[0017] The cast steel lock is mounted on the outer end of the pin. The first opening reinforcement is located near the sealing plate of the transverse support beam. The second opening reinforcement is located between the cast steel lock and the first opening reinforcement and is located near the cast steel lock.

[0018] As a preferred technical solution of this utility model: the top of the cast steel lock has an arc surface.

[0019] As a preferred embodiment of this utility model, the width of the second opening reinforcement is greater than the width of the first opening reinforcement.

[0020] As a preferred technical solution of this utility model: the self-locking device includes a base plate, a rotating shaft, a locking plate, a locking buckle, a spring, and a button block;

[0021] A pivot is provided above the base plate, and the pivot passes through the side wall of the transverse connecting beam. The extension direction of the pivot is perpendicular to the insertion direction of the pin. A locking plate passes through the pivot, and the locking plate has a latch at the end facing the pin. The locking plate has multiple springs at the end away from the pin, and the two ends of the springs are fixed to the pin and the base plate, respectively. A button block is provided on the upper surface of the locking plate, and the button block is located at the end of the locking plate with springs. A button hole is provided on the transverse connecting beam at a position corresponding to the button block.

[0022] As a preferred technical solution of this utility model: the self-locking device is further provided with a limiting plate, the limiting plate is set on the base plate, and the limiting plate is located between the latch and the spring with the spacer pin and the spring.

[0023] As a preferred technical solution of this utility model: the end face of the latch that cooperates with the pin is an arc surface.

[0024] This utility model provides a modular load transfer frame for land-based commissioning of an offshore converter station, which specifically has the following advantages:

[0025] 1) This utility model provides a spliced ​​load transfer frame, which eliminates the need for hot welding at the land commissioning site of the offshore converter station, avoiding damage to the equipment caused by hot welding operations. The on-site assembly and disassembly process is simple. At the same time, the bulk components are lightweight, and there is no need to use medium or large-sized lifting equipment for transportation from the land to the upper platform. The overall construction process cost is lower, providing an efficient and reliable solution for the arrangement of temporary equipment during the land commissioning of the offshore converter station.

[0026] 2) During assembly, the load transfer frame has the advantage that the number of transverse connecting beams, main support beams and transverse support beams can be adjusted / increased according to the existing platform main and secondary beam structure without special design and processing, and it has a wide range of applications.

[0027] 3) The pins and self-locking devices in the spliced ​​load transfer frame can effectively ensure the reliability of the connection of each component. The proposed cast steel lock and buckle arc surface and rotating mechanism contact only require pushing the component to complete the locking installation, which is highly efficient in on-site operation. At the same time, the pin is equipped with connection reinforcement (i.e., the first opening reinforcement and the second opening reinforcement) to further ensure the shear strength of the main support beam.

[0028] 4) Setting a limit plate in the self-locking device can prevent construction personnel from operating it incorrectly and prevent the pin from entering the spring assembly side behind the locking plate. Attached Figure Description

[0029] Figure 1 This is a perspective view of the splicing load transfer frame provided by this utility model.

[0030] Figure 2 A three-dimensional view of the main support beam.

[0031] Figure 3a This is a 3D view of the transverse support beam.

[0032] Figure 3b This is a three-dimensional view of the pins on the transverse support beam.

[0033] Figure 4a This is a 3D view of the transverse connecting beam.

[0034] Figure 4b This is a perspective view of the self-locking device on the transverse connecting beam.

[0035] Figure 5 This diagram illustrates the assembly process of the connectors.

[0036] Figure 6 This diagram illustrates the connection process of the latch and self-locking device.

[0037] Figure 7 The illustration shows the application of the splicing load transfer frame provided by this utility model in a platform.

[0038] In the above diagram: 1-Main support beam; 11-Square steel; 12-Sealing plate; 13-Connector; 131-Bolt hole; 132-Graphene coating; 14-Connection port; 15-Long bolt;

[0039] 2-Transverse support beam; 21-Sealing plate; 22-Pin component; 220-Pin body; 221-First opening reinforcement; 222-Second opening reinforcement; 223-Cast steel lock;

[0040] 3-Transverse connecting beam; 31-Self-locking device; 311-Base plate; 312-Rotating shaft; 313-Lock plate; 314-Lock; 315-Spring; 316-Button block; 317-Button hole; 318-Limiting plate; 32-Free combination end;

[0041] 4-Platform structural beams. Detailed Implementation

[0042] A modular load transfer frame for land-based commissioning of an offshore converter station is mainly composed of three types of prefabricated components: main support beams, transverse connecting beams, and transverse support beams.

[0043] The main support beam consists of square steel, end plates, and connectors. Three connection points are located in the middle of the square steel for connecting the transverse connecting beams and the transverse support beams. These three connection points allow for multiple sets of connections to strengthen the load transfer frame based on the weight of the equipment being tested, and also allow for adjustments based on the secondary beams of the platform structure and the equipment foundation. The two ends of the square steel are sealed with end plates, on which three connectors are welded. The spacing between the connectors is approximately equal to their thickness. When the main support beam is flipped, the connectors on the two sections of the main support beam can intersect within the spacing, forming a closed connection section. The connectors are carbon steel castings with three pre-drilled bolt holes in the middle. A graphene coating is sprayed onto the outer surface of the connectors to reduce friction between different connectors and increase wear resistance.

[0044] The transverse connecting beam and the transverse support beam together form the secondary support beam. The transverse connecting beam is set between the two main support beams, and the transverse support beam is set on the outside of the two main support beams and connected through the connection port of the main support beam.

[0045] The transverse support beam consists of square steel, end plates, pins, and connectors. Similar to the main support beam, it is closed at both ends by end plates. One end has a pin for insertion into the connection port in the main support beam and for connection to the self-locking device of the transverse connecting beam. The other end has a connector identical to that of the main support beam, used for connection to the support beam or other transverse support beams. The pin is a carbon steel casting with a rectangular body. A first raised opening reinforcement is provided near the end plate, and a second raised opening reinforcement is also provided at the end (opposite to the opening on the main support beam). The second opening reinforcement is wider than the first opening reinforcement. These two parts are mainly used to strengthen the bending resistance at the connection port of the main connecting beam. A cast steel lock with a rounded upper part is provided at the end of the pin.

[0046] The transverse connecting beam consists of square steel, end plates, self-locking devices and / or connectors. Similarly, end plates are installed at both ends of the transverse connecting beam, and a self-locking device is installed at at least one end. A connector or a self-locking device can be installed at the other end, so that the connecting beams can also be connected. If a self-locking device is installed, a button hole is opened on the top of the square steel for unlocking during disassembly.

[0047] The self-locking device is located inside the square steel frame, with its elevation corresponding to the pin assembly. It consists of a base plate, a rotating shaft, a locking plate, a locking buckle, a spring, and a button block. The base plate is located on the inner wall of the transverse connecting beam. Above the base plate, a rotating shaft of equal width is positioned on the inner wall. The locking plate is located at the rotating shaft and can rotate around it. The locking buckle of the locking plate also uses a semi-circular surface, corresponding to the cast steel lock in the pin assembly, allowing for direct locking and unlocking without button operation during assembly. A spring component is located at the end of the locking plate. When there is no load, the locking plate is parallel to the base plate, and the spring is in its natural state. A button is located in the center of the rear of the locking plate. Pressing the button during unlocking rotates the locking plate, allowing the cast steel lock in the pin assembly to disengage. A limiting plate is located between the locking plate and the base plate to prevent accidental operation of the pin assembly and damage to the self-locking device when there is no main support beam.

[0048] To further illustrate the relationship between the various prefabricated components and the operating mechanism of the device, the following explanation will focus on the assembly process:

[0049] Taking the connection of two main support beams as an example, the working mechanism of the connector is described as follows: During assembly, the two main support beams gradually approach each other at the equipment debugging position. Utilizing the smooth properties of the graphene in the connector, each connector smoothly enters the gap between them. Then, long bolts are screwed in from above to complete the connection. Disassembly only requires reversing the process.

[0050] The working mechanism of the pin and self-locking device is described using a typical connection of main support beam, transverse support beam and transverse connecting beam as an example:

[0051] (1) The pin of the transverse connecting beam is exposed on the transverse connecting side through the connection port of the main support beam. The opening reinforcement is located at the connection port of the main connecting beam to enhance the local strength.

[0052] (2) As the two transverse beams approach each other, the arc surface of the cast steel lock presses against the arc surface of the self-locking device buckle, the buckle plate rotates around the pivot and compresses the spring to form elastic force, and the button moves synchronously with the trajectory.

[0053] (3) When the two transverse beams are pushed further, the cast steel lock passes the latch, the spring force is released and returns to the initial position, the contact surface between the cast steel lock and the latch is a vertical screen surface, and the latch plate cannot be rotated by the pulling action of the two transverse beams, and the self-locking device completes the locking. In this state, the main body of the pin is in contact with the limiting plate of the self-locking device.

[0054] (4) When disassembling, the locking plate can be rotated by pressing the button on the locking plate, and the two connecting sections can be separated, so that they can be reused without the need for welding or cutting.

[0055] Based on the existing layout of the platform structure beams, and considering the conditions of the commissioning equipment and the base, different numbers of main support beams, transverse support beams, and transverse connecting beams can be selected. Each component only needs to be transported to the designated location and assembled on-site without open flame, forming a type suitable for the existing structure and base. This allows the load of the commissioning equipment to be transferred to the main platform structure beams.

[0056] The present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0057] like Figure 1 As shown, the load transfer frame in this embodiment is spliced ​​from a main support beam 1, a transverse support beam 2 and a transverse connecting beam 3. The transverse support beam 2 and the transverse connecting beam 3 together form a secondary support beam. The transverse connecting beam 3 is located between the two main support beams 1, and the transverse support beam 2 is located on the outside of the two main support beams 1 and is connected through the connection port 14 in the main support beam 1.

[0058] like Figure 2 As shown, the main support beam 1 consists of square steel 11, sealing plates 12, and connectors 13. Three connection ports 14 are reserved in the middle of the square steel 11 for connecting the transverse support beam 2 and transverse connecting beam 3 at different connection positions and with different connection requirements, thus providing greater adaptability to the beam positions of the equipment base and platform structure. Both ends of the square steel 11 are sealed with sealing plates 12, and a set of connectors 13 (three in this embodiment) are welded onto them. The spacing and thickness between the connectors 13 are approximately equal, facilitating cross-connection of two sets of connectors 13. The connectors 13 are carbon steel castings with three bolt holes 131 reserved in the middle for fixing with bolts after docking.

[0059] like Figure 3a and Figure 3b As shown, the transverse support beam 2 consists of square steel 11, a sealing plate 21, a pin 22, and a connector 13 (consistent with the connector 13 in the main support beam 1). A pin 22 is provided at one end of the transverse support beam 2, which matches the connection port 14 in the main support beam 1; the connector 13 at the other end is used for connection with connectors of other components. The pin 22 is also a carbon steel casting, consisting of a pin body 220, a first opening reinforcement 221, a second opening reinforcement 222, and a cast steel lock 223. The first opening reinforcement 221 and the second opening reinforcement 222 are used to strengthen the bending and shear strength of the connector 13 reserved in the main support beam 1; a cast steel lock 223 with an arc-shaped upper part is provided at the end of the pin 22.

[0060] like Figure 4a and Figure 4b As shown, the transverse connecting beam 3 consists of a square steel 11, a self-locking device 31, and a freely combinable end 32. The self-locking device 31 is installed at least at one end of the square steel, and the freely combinable end 32 can be either a connector 13 or the self-locking device 31 to ensure different combinations. When the self-locking device 31 is installed, a button hole 317 is opened on the top of the square steel 11 for unlocking when the self-locking device 31 is disassembled. The self-locking device 31 is installed inside the square steel, and its elevation corresponds to that of the connection port 14 and the pin 22. It consists of a base plate 311, a rotating shaft 312, a locking plate 313, a locking buckle 314, a spring 315, a button block 316, and a limiting plate 318. The base plate 311 is installed on the inner wall of the square steel 11, and a through rotating shaft 312 is installed above it. The locking plate 313 can rotate around the rotating shaft 312. At the end of the locking plate 313, a semi-circular locking buckle 313 is provided, which corresponds to the cast steel lock 223 with a rounded top surface, so as to facilitate direct insertion during assembly. Locking mechanism; Four sets of springs 315 are provided at the end of the locking plate 313. When the springs 315 are in their natural state, the locking plate 313 is parallel to the base plate 311. This structure is mainly used for automatic locking and unlocking operations, enhancing the reliability of the connection; A button block 316 is provided in the middle of the rear of the locking plate 313. When unlocking, pressing the button block 316 will cause the locking plate 313 to rotate and the latch 314 to disengage; A limiting plate 318 is provided between the base plate 311 and the locking plate 313 to prevent the pin 22 from entering too deeply and damaging the spring set of the self-locking device 31 in case of misoperation.

[0061] The working mechanism of connector 13 is as follows Figure 5As shown, to improve the smoothness of the interface connection of connector 13, a graphene coating 132 is sprayed on the upper and lower surfaces of connector 13, which can reduce friction and improve wear resistance. Combining the elevation and top views, the two parts to be connected are first brought close together, allowing each group in connector 13 to enter the symmetrical gaps above and below to complete the initial connection. Then, long bolts 15 are screwed in from above to complete the final connection. Disassembly is simply a matter of reversing the process.

[0062] The working mechanism of the pin 22 and the self-locking device 31 is as follows: Figure 6 As shown, firstly, the pin 22 passes through the connection port 14 in the main support beam 1, where both the first and second opening reinforcement members 221 and 222 are inserted into the connection port 14, strengthening the local structure. Simultaneously, a graphene coating is also applied at the connection port, serving the same function as the connector 13. In this step, the cast steel lock 223 has already transversely crossed the main support beam 1. Subsequently, the two components move closer together, the arc surface of the cast steel lock 223 presses against the arc surface of the latch 314, the latch plate 313 rotates around the pivot 312, and the end of the latch plate 313 compresses the spring 315 to form elastic force. The button block 316 moves synchronously with the trajectory, the latch 314 opens, and the cast steel lock 223 slowly enters the self-locking device 31.

[0063] When further pushed and installed, the cast steel lock 223 passes over the latch 314, the spring 315 releases the latch plate 313 and returns to the initial position, the contact surface between the cast steel lock 223 and the latch 314 increases to form a self-locking mechanism, at this time there are no gaps between the components, the top of the pin body 220 just contacts the limiting plate 318, and the self-locking installation and splicing are completed.

[0064] If disassembly is desired, the latch plate 313 can be rotated again by pressing the button block 316. The cast steel lock 223 and the latch 314 will not be in direct contact, the latch will open, and the connecting sections will be separated by pulling outwards, realizing the reuse of each component and other types of assembly.

[0065] Based on the above working principles, such as Figure 7The diagram shows a typical arrangement of the assembled components on the platform according to this embodiment. In this embodiment, the platform structural beams 4 are relatively sparse. Without a load transfer frame, the equipment base and the beam system would be misaligned, easily causing deformation and damage to the deck structure. Considering both the location of the equipment foundation base and the "well"-shaped platform structural beams, six main support beams 1 and three corresponding sets of transverse support beams 2 and transverse connecting beams 3 are selected for assembly and connection. The assembled main support beams 1 and transverse connecting beams 3 correspond to the equipment base. Simultaneously, the two outer transverse connecting beams 3 correspond to the platform structural beams 4, allowing the equipment load to be transferred through the six main support beams 1 and three transverse connecting beams 3 to the four structural beams of the "well"-shaped platform structural beams 4, ensuring a reasonable load transfer path. Furthermore, this invention avoids on-site hot work, is simple to assemble and disassemble, and has strong adaptability, providing an efficient and reliable solution for the arrangement of temporary equipment during land-based commissioning of offshore converter stations.

[0066] The above specific embodiments are used to explain and illustrate the present utility model, and are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made to the present utility model within the spirit and protection scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A modular load transfer frame for land-based commissioning of an offshore converter station, characterized in that: This includes the main support beam, the transverse connecting beam, and the transverse support beam; The main support beam includes square steel, end plates for sealing both ends of the square steel, and connectors set on the end plates. The connectors are used to connect two adjacent main support beams. The square steel has multiple connection ports on its side, which are used to connect transverse connecting beams and transverse support beams. The transverse support beam and the transverse connecting beam together form a secondary support beam; The transverse support beam includes square steel, sealing plates for sealing both ends of the square steel, pins, and connectors. The connectors are used to connect two adjacent transverse support beams or to connect a transverse support beam with a transverse connecting beam. The transverse connecting beam includes square steel, sealing plates for sealing both ends of the square steel, and at least one self-locking device; the self-locking device is installed on the sealing plate at the end of the square steel, and the self-locking device on the transverse connecting beam cooperates with the pin on the transverse support beam in the connection port of the main support beam.

2. The modular load transfer frame for land-based commissioning of an offshore converter station according to claim 1, characterized in that: The connecting parts at both ends of the main support beam include a first connecting part and a second connecting part. Both the first connecting part and the second connecting part include three connecting plates. The three connecting plates of the first connecting part of the first main support beam and the three connecting plates of the second connecting part of the second main support beam are staggered so that the two cross and close and are locked by bolts.

3. The modular load transfer frame for land-based commissioning of an offshore converter station according to claim 2, characterized in that: The outer surface of the connecting plate is coated with a graphene coating.

4. The modular load transfer frame for land-based commissioning of an offshore converter station according to claim 1, characterized in that: The pin is provided with a first opening reinforcement, a second opening reinforcement and a cast steel lock; The cast steel lock is mounted on the outer end of the pin. The first opening reinforcement is located near the sealing plate of the transverse support beam. The second opening reinforcement is located between the cast steel lock and the first opening reinforcement and is located near the cast steel lock.

5. The modular load transfer frame for land-based commissioning of an offshore converter station according to claim 4, characterized in that: The top of the cast steel lock has an arc surface.

6. The modular load transfer frame for land-based commissioning of an offshore converter station according to claim 4, characterized in that: The width of the second opening reinforcement is greater than the width of the first opening reinforcement.

7. The modular load transfer frame for land-based commissioning of an offshore converter station according to claim 1, characterized in that: The self-locking device includes a base plate, a rotating shaft, a locking plate, a locking buckle, a spring, and a button block; A pivot is provided above the base plate, and the pivot passes through the side wall of the transverse connecting beam. The extension direction of the pivot is perpendicular to the insertion direction of the pin. A locking plate passes through the pivot, and the locking plate has a latch at the end facing the pin. The locking plate has multiple springs at the end away from the pin, and the two ends of the springs are fixed to the pin and the base plate, respectively. A button block is provided on the upper surface of the locking plate, and the button block is located at the end of the locking plate with springs. A button hole is provided on the transverse connecting beam at a position corresponding to the button block.

8. The modular load transfer frame for land-based commissioning of an offshore converter station according to claim 7, characterized in that: The self-locking device is also provided with a limiting plate, which is set on the base plate and is positioned between the latch and the spring to separate the pin and the spring.

9. The modular load transfer frame for land-based commissioning of an offshore converter station according to claim 7, characterized in that: The end face of the latch that mates with the pin is an arc surface.

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