A detachable bracket for assembling multi-model wind turbines

Abstract

This utility model discloses a detachable bracket for assembling wind turbines of multiple models, relating to the field of wind turbine assembly. It includes a bottom frame, a middle frame, and a top frame stacked sequentially, connected by connecting bolt pairs. A pad assembly is fixed on the top frame, with an arc-shaped stop groove and a first hole on the pad assembly. A second hole matching the first hole is also provided on the top frame. Both the first and second holes are located on the concave side of the stop groove, and a locking bolt pair passes through both holes. This utility model, while ensuring sufficient strength to resist lateral and torsional forces during wind turbine assembly under hoisting conditions, features a legless design, reducing the overall size of the bracket and minimizing deformation of the bracket's bottom surface. Simultaneously, it achieves compatibility with different turbine hubs for tooling connection, achieving universality and solving the problems of poor compatibility and cumbersome replacement of adapter flanges in existing wind turbine assembly brackets.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine assembly, and in particular to a detachable bracket for assembling wind turbines of multiple models. Background Technology

[0002] For onshore wind turbines with doubly fed or semi-direct drive systems, the rotors are mostly assembled on-site. The rotor assembly is usually carried out by hoisting the rotor as a whole, and the tooling used is a rotor assembly bracket (hereinafter referred to as the bracket for ease of explanation). Specifically, during rotor assembly, the hub is first placed on the bracket, and then the blades are installed on the hub pitch bearings, and then hoisted.

[0003] Traditional support system with a main support and three long legs, such as Figure 1 As shown, the main support frame is welded together as a whole, with three long support legs arranged in a circumferential array and bolted to the main support frame, forming a stable triangular structure that can resist lateral and torsional forces during wind turbine assembly, preventing the support frame from swaying or deforming. During use, the following defects were found in traditional support frames: 1. The maximum unfolded width of the support is 5.7 meters, and the overall width after disassembling the legs is also 3 meters. The tooling and transportation costs are high. Multiple road plate blocks need to be prepared on site for horizontal placement of the entire support. In addition, the legs need to be frequently installed and disassembled, and the legs are prone to deformation. 2. The bracket has low versatility. Different adapter flanges are required for the assembly of wind turbines of different models. The matching is prone to errors, and there may even be no suitable adapter flange available, which will affect the on-site hoisting. At the same time, in order to adapt to the assembly of wind turbines of various models, a variety of adapter flanges need to be prepared. The large size of the hub determines the size of the adapter flange, which in turn results in a large economic cost. 3. The main support is a cylindrical structure, requiring a separate manhole. In order to ensure the strength of the main support, additional reinforcing components are installed on the outside of the main support, which results in a large number of parts in the entire support, making the processing difficult and costly. 4. The stop groove and drilled holes are directly opened on the top steel plate of the main support. The distribution of the stop groove affects the hole layout and structural strength.

[0004] Therefore, given the aforementioned technical problems with traditional stents, a new stent needs to be developed. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems by providing a detachable support for assembling wind turbines of multiple models. While ensuring sufficient strength to resist lateral and torsional forces during wind turbine assembly under the same hoisting conditions, the support features a legless design, reducing the overall size of the support, minimizing site occupation, and reducing deformation of the support's bottom surface. Simultaneously, it achieves compatibility with different wind turbine hubs for tooling connection, achieving universality and effectively solving the problems of poor compatibility of existing wind turbine assembly supports and cumbersome replacement of adapter flanges.

[0006] The technical solution adopted by this utility model is as follows: A support frame applicable to the assembly of wind turbines of multiple models includes a bottom frame, a middle frame and a top frame stacked in sequence. The bottom frame, the middle frame and the top frame are connected by a pair of connecting bolts. A pad assembly is fixed on the top frame, and the pad assembly has an arc-shaped stop groove and a first hole. The top frame has a second hole that matches the first hole. The first hole and the second hole are both located on the concave side of the stop groove. A pair of locking bolts passes through the first hole and the second hole.

[0007] Furthermore, the bottom shelf, middle shelf, and top shelf are all composed of H-beams.

[0008] Furthermore, a reinforcing plate is provided between the upper and lower surfaces of the H-beam.

[0009] Furthermore, both the bottom and top shelves have four H-beams, which are assembled into a rectangular structure. The bottom shelf has a branch at the corner. The middle shelf has two H-beams arranged in parallel with a gap between them, which forms a manhole.

[0010] Furthermore, one of the H-beams in the bottom layer has a recessed groove that extends to the bottom. This groove is located between the two H-beams that make up the middle layer, and the spacing between them forms a manhole.

[0011] Furthermore, each H-beam of the top-level frame is provided with a hand hole.

[0012] Furthermore, the number of the pad assemblies is four, and the pad assemblies are arranged circumferentially along the axis of the stop groove.

[0013] Furthermore, the pad assembly includes a base plate and multiple profile plates fixed on top, with arc-shaped stop grooves formed between the profile plates; a first hole penetrates through the base plate and the profile plates.

[0014] Furthermore, it also has a lifting hole that passes through the top shelf and pad assembly.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. This utility model only welds the bottom frame and the top frame, and connects the bottom frame, the middle frame and the top frame into a whole by bolt connection, which effectively reduces the amount of welding work. Since the bottom frame, the middle frame and the top frame are all composed of H-beams, there is no need for excessive machining, which can reduce the manufacturing cost. 2. This utility model eliminates the support leg structure, reduces the overall size of the bracket, facilitates transportation, and thus reduces transportation costs; 3. This utility model can be adapted to the assembly of impellers of various models through the matching first and second holes, and has high adaptability. Attached Figure Description

[0016] This utility model will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of a traditional support structure; Figure 2 A schematic diagram of the structure of this utility model; Figure 3 This is a front view structural diagram of the present utility model; Figure 4 This is a top view of the structure of this utility model; The markings in the diagram are: 1-bottom shelf; 11-groove; 12-outlet; 2-middle shelf; 21-manhole; 3-top shelf; 31-handhole; 4-pad assembly; 401-first assembly; 402-second assembly; 41-stop groove; 42-first hole; 43-profile plate; 44-bottom plate; 5-locking bolt pair; 6-H-beam; 61-reinforcing plate; 7-connecting bolt pair. Detailed Implementation

[0017] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0018] Furthermore, the use of terms such as "horizontal" or "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0019] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; it can be a connection within two components.

[0020] Example 1 like Figures 2-4 As shown, a detachable support for assembling multi-model wind turbines includes a bottom frame 1, a middle frame 2, and a top frame 3 stacked sequentially. The bottom frame 1, the middle frame 2, and the top frame 3 are connected by connecting bolt pairs 7. A pad assembly 4 is fixed on the top frame 3, and the pad assembly 4 has an arc-shaped stop groove 41 and a first hole 42. The top frame 3 has a second hole that matches the first hole 42. Both the first hole 42 and the second hole are located on the concave side of the stop groove 41, which is adapted to the position of the flange connection hole on the hub. A locking bolt pair 5 passes through each of the first hole 42 and the second hole.

[0021] In this embodiment, the bottom frame 1, the middle frame 2, and the top frame 3 are connected by connecting bolt pairs 7, which enables a detachable connection and solves the problem of high difficulty in later modification and maintenance costs. The bottom frame 1, the middle frame 2, and the top frame 3 can be disassembled for modification and maintenance. When installing the hub, the screw in the locking bolt pair 5 passes through the flange connection hole, the first hole 42, and the second hole in sequence, and then locks it with the nut to complete the hub installation. This connection structure can connect the hub and the bracket into a whole, ensuring the stability of the hub and blade installation process.

[0022] It should be noted that the maximum hole spacing of the connecting flange on the hub varies for different turbine models. In this embodiment, by setting the first hole 42 and the second hole to have their length direction along the radial direction, the position of the locking bolt pair 5 can be adjusted along the radial direction, thus making it suitable for hubs of different turbine models and exhibiting high adaptability. For example, this bracket can be applied to main turbine models such as onshore doubly fed 5MW and semi-direct drive 6~10MW. Further, in this embodiment, the stop groove 41 and the first hole 42 are set on the pad assembly 4, not on the top layer frame 3, which minimizes the damage to the steel structure strength of the top layer frame 3, ensuring its strength and thus guaranteeing sufficient strength to resist lateral and torsional forces during turbine assembly.

[0023] In this embodiment, the bottom frame 1, the middle frame 2, and the top frame 3 are all composed of H-beams 6. H-beams 6 are high-strength structural steel with great support and bending resistance, which is the basis for ensuring the overall strength of the support. At the same time, the connecting bolt pairs 7 can be installed on the upper and lower steel plates of the H-beams 6 using the H-beams 6.

[0024] In this embodiment, a reinforcing plate 61 is provided between the upper and lower surfaces of the H-beam 6 to further improve the support and bending resistance of the H-beam 6.

[0025] In this embodiment, both the bottom frame 1 and the top frame 3 have 4 H-beams 6, and the 4 H-beams 6 are assembled into a rectangular structure. The bottom frame 1 has a branch 12 at the corner. The middle frame 2 has 2 H-beams 6, which are arranged in parallel and have a gap between them, forming a manhole 21.

[0026] It should be noted that the bottom frame 1 and the top frame 3 are assembled into a rectangular structure by four H-beams 6. The support has a hollow space in the middle that does not affect the strength. This hollow space can be used as a space for personnel to operate. Furthermore, the distance between the two H-beams 6 of the middle frame 2 can be used as a manhole 21, so that the support does not need to open a manhole 21 at the cost of damaging the structure, thus ensuring the strength of the support and the access of operators.

[0027] To further explain, the support section 12 is actually the two ends of two parallel H-beams 6 out of the four H-beams 6. The design of the support section 12 can provide tilt support and effectively prevent the feet from tilting.

[0028] Furthermore, the H-beams on the same side are stacked vertically to ensure the effectiveness of the support force transmission.

[0029] Furthermore, in the bottom shelf 1, one of the H-beams 6 has a recessed groove 11 that is recessed to the bottom. The groove 11 is located between the two H-beams 6 that make up the middle shelf 2, and the spacing between them forms a manhole 21. The geometry of the manhole 21 is enlarged by setting the groove 11.

[0030] Furthermore, each H-beam 6 of the top-level frame 3 is provided with a hand hole 31, allowing personnel to reach through the hand hole 31 from both inside and outside the frame to perform the locking bolt pair 5 operation. Specifically, based on the requirement that the frame needs to provide sufficient support capacity, the middle plate of the H-beam needs to be located inside the stop groove 41, meaning that the middle plate is actually the chord of the arc-shaped stop groove 41 in projection. However, when installing the wheel hub, some locking bolt pairs 5 need to be located on the outside of the frame. Therefore, the hand hole 31 facilitates the installation of locking bolt pairs 5 on both the inside and outside of the frame, eliminating the need for personnel to repeatedly enter and exit the hollow space inside the frame.

[0031] In this embodiment, there are four pad assemblies 4, which are arranged symmetrically in a circumferential array along the axis of the stop groove 41, effectively reducing the difficulty of docking. Preferably, the four pad assemblies 4 are distributed on each side of the top layer frame 3. It should be noted that this arrangement can mutually constrain the locking bolt pair 5 through the pad assemblies 4 on adjacent sides, preventing the locking bolt pair 5 from sliding along the length direction of the first hole 42 / second hole, thus achieving a stable support effect.

[0032] Further design, such as Figure 4 As shown, the four pad assembly 4 includes two first assemblies 401 and two second assemblies 402. The first assemblies 401 and the second assemblies 402 are distributed at intervals, and the mirror symmetry plane of each pad assembly 4 is coplanar with the mirror symmetry plane of the whole consisting of the top frame 3 or the bottom frame 1, the middle frame 2 and the top frame 3. The symmetrical design achieves uniform force distribution and improves the stability of the bracket supporting the wheel hub.

[0033] Further design, the first hole includes holes A, B, C, D and E provided on the pad assembly 4; similarly, the second hole includes holes a, b, c, d and e provided on the top of the top frame 3, and the distribution of holes a and A, b and B, c and B, d and B, and e and B are matched, such that a locking bolt pair 5 can pass through holes a and A simultaneously; More specifically, the first assembly 401 has an A hole, the centers of the two arc segments of the A hole are collinear with the center of the stop groove 41, and are located on the mirror symmetry plane of the first assembly 401; it also has two B holes, which are located within the stop groove 41, and the centers of the two arc segments of the B holes are on the same circumference, the center of which is concentric with the center of the stop groove 41; the C holes are located on both sides of the A hole and are symmetrical with respect to the mirror symmetry plane of the first assembly 401, and the length direction of the C holes is parallel to the length direction of the A hole; the D holes are also located on both sides of the A hole and are symmetrical with respect to the mirror symmetry plane of the first assembly 401, but the centers of the two arc segments of the D holes are collinear with the center of the stop groove 41; in terms of spatial position, the B holes, C holes, and D holes are successively closer to the A hole.

[0034] The second assembly 402 has 3 A holes, 2 C holes, and 2 E holes. The position of one of the three A holes relative to the second assembly 402 is the same as the position of the A hole on the first assembly 401 relative to the first assembly 401. The positions of the other two A holes relative to the second assembly 402 are the same as the position of the D hole on the first assembly 401 relative to the first assembly 401. The position of the C hole relative to the second assembly 402 is the same as the position of the C hole on the first assembly 401 relative to the first assembly 401. The position of the E hole relative to the second assembly 402 is the same as the position of the C hole on the first assembly 401 relative to the first assembly 401. The only difference is in the geometric dimensions.

[0035] In summary, the wheel hub is secured to the bracket by passing the locking bolt assembly 5 through the first hole, the second hole, and the flange hole on the hub. Although the locking bolt assembly 5 can move within a single hole, the numerous holes effectively constrain its freedom of movement, ensuring stable support and preventing wobbling. Furthermore, the positional distribution of the first and second holes is sufficient to accommodate the hub and blade installation of major onshore doubly-fed 5MW and semi-direct-drive 6~10MW turbine models, effectively achieving multi-model compatibility. Moreover, the symmetrical distribution of these first and second holes allows for rapid positioning and reduced adjustment when hoisting the hub onto the bracket.

[0036] In this embodiment, the pad assembly 4 includes a base plate 44 and multiple profile plates 43 fixed on the top, with an arc-shaped stop groove 41 formed between the profile plates 43; the first hole 42 penetrates the base plate 44 and the profile plates 43, and the stop groove 41 is formed by assembling the profile plates 43, avoiding the need to open the stop groove 41 by removing material, effectively reducing the processing difficulty, and further ensuring the strength of the profile plates 43; on the other hand, the stop groove 41 formed by assembling the profile plates 43 does not affect the layout of the holes on the base plate 44; compared with the traditional solution, in which opening holes on the steel plate will avoid the stop groove on the steel plate, and opening grooves on the steel plate will also affect the overall strength; while this application uses the profile plates 43 to form the stop groove, which can not only meet the hole position requirements of multiple models, but also meet the static load requirements of the wind turbine when the profile plates 43 are directly subjected to force, and at the same time, the holes are only opened on the base plate 44 (equivalent to the steel plate in the traditional solution), and no stop groove is opened, that is, it will not affect the overall connection strength.

[0037] Preferably, the base plate 44 is a steel plate and the profile plate 43 is a nylon plate. The profile plate 43 and the base plate 44 can be connected by screws to achieve the purpose of disassembling and replacing the profile plate 43.

[0038] In this embodiment, a lifting hole is also provided, which passes through the top layer frame 3 and the pad assembly 4. The lifting hole is used to install lifting rings for easy lifting.

[0039] In summary, this application only welds the bottom frame 1 and the top frame 3, and connects the bottom frame 1, the middle frame 2, and the top frame 3 into a whole by bolting, effectively reducing the amount of welding work. Since the bottom frame 1, the middle frame 2, and the top frame 3 are all composed of H-beams 6, there is no need for excessive machining, which can reduce manufacturing costs. The leg structure is eliminated, reducing the overall size of the support, with a maximum size of only about 2.5m, which facilitates transportation and reduces transportation and production costs (by about 30%). The matching first hole 42 and second hole can be used to adapt to the assembly of various wind turbine models, which has high adaptability.

[0040] Example 2 A wind turbine assembly method, using a bracket applicable to the assembly of wind turbines of multiple models as described in the embodiments, includes the following steps: S1: The bracket is first assembled in the workshop, and then transported to the site using a regular pallet truck. S2: Install lifting rings in the lifting holes, use lifting tools to unload the entire bracket, and place the wheel hub installation direction on the plane of the roadbed plate; S3: Remove the locking bolt assembly 5 and ensure that the surface of the pad is free of debris; S4: Install the wheel hub lifting ring and use the lifting tool to lift the wheel hub onto the bracket so that the positioning ring on the wheel hub is inserted into the stop groove 41; S5: Adjust the circumferential direction of the hub so that the flange connection hole on the hub is located within the first hole 42; S6: Pass the screw in the locking bolt assembly 5 through the flange connection hole, the first hole 42 and the second hole in sequence, and then tighten it with the nut to complete the installation of the wheel hub; S7: Install the blades onto the hub to complete the assembly of the wind turbine.

[0041] Further, in step S1, the assembly of the support includes the following steps: S11: First, weld the H-beams 6 that make up the bottom frame 1 to form the bottom frame 1, and place the bottom frame 1 on a flat ground; S12: Then fix the H-beam 6 in the middle layer frame 2 to the bottom layer frame 1 using connecting bolts 7; S13: Then fix the top layer frame 3 to the middle layer frame 2 using connecting bolts 7; the top layer frame 3 needs to be pre-assembled by welding the H-beams 6 that make up the top layer frame 3. S14: Then install the pad assembly 4 onto the top layer frame 3 with screws; the pad assembly 4 needs to be pre-assembled with the base plate 44 and multiple mold plates 43 to form the stop groove 41; and sealant is applied between the base plate 44 and the mold plates 43 for sealing and auxiliary fixing. S15: The entire bracket surface is coated with paint for corrosion protection, and the perimeter of the pad assembly 4 is sealed with sealant for auxiliary fixation.

[0042] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A detachable support frame for assembling multi-model wind turbines, characterized in that: The device includes a bottom shelf (1), a middle shelf (2), and a top shelf (3) stacked in sequence. The bottom shelf (1), the middle shelf (2), and the top shelf (3) are connected by a connecting bolt pair (7). A pad assembly (4) is fixed on the top shelf (3), and the pad assembly (4) has an arc-shaped stop groove (41) and a first hole (42). The top shelf (3) has a second hole that matches the first hole (42). The first hole (42) and the second hole are both located on the concave side of the stop groove (41). A locking bolt pair (5) passes through the first hole (42) and the second hole.

2. The detachable bracket according to claim 1, characterized in that: The bottom frame (1), middle frame (2) and top frame (3) are all composed of H-beams (6).

3. The detachable bracket according to claim 2, characterized in that: A reinforcing plate (61) is provided between the upper and lower surfaces of the H-beam (6).

4. The detachable bracket according to claim 2, characterized in that: The bottom shelf (1) and the top shelf (3) each have 4 H-beams (6), and the 4 H-beams (6) are assembled into a rectangular structure; the bottom shelf (1) has a branch (12) at the corner; the middle shelf (2) has 2 H-beams (6), the 2 H-beams (6) are arranged in parallel, and there is a gap between the 2 H-beams (6), which forms a manhole (21); or / and one of the H-beams (6) in the bottom shelf (1) has a recessed groove (11) that is recessed to the bottom, the groove (11) is located between the 2 H-beams (6) that make up the middle shelf (2), and the gap forms a manhole (21).

5. The detachable bracket according to claim 4, characterized in that: Each H-beam (6) of the top-level frame (3) is provided with a hand hole (31).

6. The detachable bracket according to claim 1, characterized in that: The number of pad assemblies (4) is 4, and the pad assemblies (4) are arranged circumferentially along the axis of the stop groove (41).

7. The bracket according to claim 1, characterized in that: The pad assembly (4) includes a base plate (44) and multiple profile plates (43) fixed on the top, with an arc-shaped stop groove (41) formed between the profile plates (43); a first hole (42) penetrates the base plate (44) and the profile plates (43).

8. The detachable bracket according to claim 1, characterized in that: It also has a lifting hole that passes through the top shelf (3) and the pad assembly (4).

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