A wind turbine nacelle rear underframe left and right main beam assembly welding device

Abstract

The utility model discloses a kind of wind power cabin rear underframe left and right main girder assembly welding devices, specifically related to wind power cabin processing technical field, install on table top, main girder includes flange plate and web, including the supporting mechanism for adjusting the plane bending deflection of web and supporting flange plate and the adjusting mechanism for adjusting the height of main girder, supporting mechanism includes the positioning plate for supporting the side of flange plate, the anti-inclination plate for preventing flange plate from toppling and the fixed column for supporting web, cam handle for adjusting flange plate and web joint is equipped on fixed column;Adjusting mechanism includes the adjusting seat assembly for adjusting the center height of flange plate, height adjustment assembly for adjusting the center height of web and end positioning assembly for improving the positioning accuracy of main girder.The utility model is cooperated by supporting mechanism and adjusting mechanism, realize accurate positioning, flexible adjustment and firm fixation to main girder flange plate and web, provide stable and reliable structural foundation for subsequent assembly welding work.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine nacelle processing technology, specifically relating to a welding device for the left and right main beams of the rear underframe of a wind turbine nacelle. Background Technology

[0002] With the rapid development of the new energy industry, wind power, as an important component of clean energy, is seeing continuous improvement in its installed capacity and technological level. The wind turbine nacelle, as the core component of the wind turbine generator set, plays a crucial role in housing key equipment such as the generator and gearbox. The rear underframe of the wind turbine nacelle is a critical load-bearing component supporting the entire nacelle structure, and its structural stability and connection strength directly affect the safe operation and service life of the wind turbine generator set. The left and right main beams of the rear underframe, as the main load-bearing components, are typically I-shaped longitudinal variable cross-section structures, welded together from the upper flange plate, web plate, and lower flange plate. Their structural precision and welding quality significantly impact the overall performance of the rear underframe. Therefore, during the welding process of the left and right main beams of the rear underframe, precise positioning and secure fixing of the flange plates and web plates are necessary to ensure that the dimensional accuracy and structural strength of the welded main beams meet design standards.

[0003] However, the traditional welding of the left and right main beams relies on manual measurement of the distance between the web and the flange. This requires multiple adjustments to the distance between the web and the flange for the welding operation. During this process, on the one hand, there are problems such as poor fit between the web and the upper and lower flanges, uneven gaps on the mating surfaces, inconsistent forming heights, and unstable welding quality. On the other hand, the deflection and bending of the web plate length greatly affects the difficulty of the measurement operation. The web position needs to be repeatedly adjusted during measurement, which is cumbersome for personnel and results in low work efficiency. Utility Model Content

[0004] This utility model provides a welding device for the left and right main beams of the rear underframe of a wind turbine nacelle, in order to solve at least one of the above-mentioned technical problems.

[0005] The technical solution adopted in this utility model is as follows: a welding device for the left and right main beams of the rear underframe of a wind turbine nacelle, installed on a platform. The main beam includes a flange plate and a web plate, and includes a support mechanism for adjusting the planar bending deflection of the web plate and supporting the flange plate, and an adjustment mechanism for adjusting the height of the main beam. The support mechanism includes a positioning plate for supporting the side of the flange plate, an anti-tilting plate for preventing the flange plate from tipping over, and a fixing column for supporting the web plate. The fixing column is provided with a cam handle for adjusting the joint between the flange plate and the web plate. The adjustment mechanism includes an adjustment seat assembly for adjusting the center height of the flange plate, a height adjustment assembly for adjusting the center height of the web plate, and an end positioning assembly for improving the positioning accuracy of the main beam.

[0006] In a preferred embodiment, the adjusting seat assembly includes a base fixed to the table surface, an adjusting bolt connected to the base, a locking nut sleeved on the adjusting bolt, and a spherical washer provided on the adjusting bolt.

[0007] In a preferred embodiment, an elastic element is connected between the spherical pad and the adjusting bolt.

[0008] In a preferred embodiment, the height adjustment assembly includes a support base, a mounting groove on the support base, a support plate disposed in the mounting groove, and an adjusting screw fixed to one side of the support base. The adjusting screw is provided with a fastener connected to the support plate, so as to adjust and fix the height of the support plate by adjusting the fastener.

[0009] In a preferred embodiment, the end positioning assembly includes a bearing seat, a fixed shaft fixed on the bearing seat, an end plate disposed on the fixed shaft, and a locking element disposed at the end of the end plate away from the fixed shaft.

[0010] In a preferred embodiment, the locking member includes a stop block disposed on the end plate, a tension locking handle fixed on the stop block, a T-bolt connected to the tension locking handle, and a C-groove disposed on the table to cooperate with the movement of the T-bolt.

[0011] In a preferred embodiment, the positioning plate has a buffer layer on the side facing the flange, and the anti-roll plate has an arc on the side facing the flange.

[0012] In a preferred embodiment, the cam handle is provided with an eccentric wheel to fix the flange and the web plate.

[0013] In a preferred embodiment, the tabletop is connected to a bracket, the bracket is provided with a support adjustment assembly, the support adjustment assembly includes a support connected to one end of the bracket facing away from the tabletop, an adjustment member cooperating with the support, and a locking ring for locking the adjustment member and the support.

[0014] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows: 1. As a preferred embodiment of this utility model, the coordinated operation of the support mechanism and the adjustment mechanism enables precise positioning, flexible adjustment, and secure fixing of the main beam flange plate and web plate, providing a stable and reliable structural foundation for subsequent welding work. Specifically, the support mechanism forms a basic support frame through positioning plates, anti-tilting plates, and fixing columns, adjusting the planar bending deflection of the web plate due to its length, improving the flatness and center positioning dimensions of the web plate, reducing the frequency of personnel measurements, and simultaneously using a cam handle to fine-tune the joint position, ensuring the fitting accuracy before welding. The adjustment mechanism, through the adjustment seat assembly, height adjustment assembly, and end positioning assembly, precisely adjusts the center height of the flange plate, the center height of the web plate, and the end position of the main beam, respectively, enabling the welding of main beams with different specifications of longitudinal variable cross-section structures.

[0015] 2. In a preferred embodiment of this utility model, the adjusting seat assembly achieves precise adjustment of the center height of the flange plate by utilizing the threaded transmission principle. At the same time, the spherical pad utilizes the spherical contact characteristics to adapt to the slight tilt or unevenness of the bottom surface of the flange plate, ensuring uniform force on the flange plate. The locking nut uses friction to limit the rotation of the adjusting bolt, preventing the adjusting bolt from loosening due to vibration or other factors during subsequent welding, thus ensuring that the flange plate height remains stable.

[0016] In addition, the spherical pad is connected to an elastic element, which can be a limiting spring, etc. On the one hand, the elastic element can buffer the instantaneous impact force between the spherical pad and the adjusting bolt, and prevent the flange surface from being deformed or damaged due to rigid compression; on the other hand, the elastic limiting function of the elastic element can limit the excessive displacement of the spherical pad and prevent the spherical pad from separating from the flange when the adjusting bolt is adjusted.

[0017] 3. In a preferred embodiment of this utility model, the height adjustment component drives the support plate to move vertically within the mounting groove of the support seat through the threaded transmission action of the adjusting screw and the fastener, thereby achieving precise adjustment and stable fixation of the center height of the web plate. The mounting groove guides the support plate, restricts its lateral displacement, and ensures that the support plate can only move stably in the vertical direction. 4. In a preferred embodiment of this utility model, the purpose of adjusting the flange plate and the web plate positioning end to be coplanar is achieved by the end positioning device. The bearing seat serves as the basic load-bearing structure and provides a stable reference for positioning. The fixed shaft is installed on the bearing seat and provides a rotation center for the end plate assembly. The end of the main beam is fixed to the end plate by the mechanical locking method of the locking member to prevent the angle of the end plate assembly from changing during the clamping process.

[0018] Furthermore, the locking mechanism, through the coordinated action of the stop block, tension locking handle, T-bolt, and C-groove, utilizes the lever principle and threaded locking force to firmly press the end plate block against the table surface, restricting its displacement and achieving a secure lock on the end plate. Specifically, the tension locking handle utilizes the lever principle; rotating the handle moves the T-bolt, and the C-groove provides a track for the T-bolt's movement, forming a closed locking structure.

[0019] In a preferred embodiment of this utility model, the buffer layer of the positioning plate absorbs the impact force when the flange plate comes into contact with the positioning plate by utilizing the elastic deformation of the material. At the same time, the buffer layer can increase the friction between the positioning plate and the flange plate, thereby improving the positioning stability of the flange plate in the horizontal direction.

[0020] The arc structure of the anti-roll plate adapts to the slight positional deviation of the flange plate through the guiding effect of the arc, avoiding damage to the flange plate or the anti-roll plate itself due to local stress concentration, while ensuring the uniform transmission of support force.

[0021] 6. In a preferred embodiment of this utility model, the cam handle utilizes the characteristic of generating clamping force by changing the radius of rotation of the eccentric wheel to quickly fix and loosen the flange plate and the web plate, thereby achieving flush fit and positioning of the flange plate and the web plate, eliminating gaps and positioning errors in the joint.

[0022] 7. In a preferred embodiment of the present invention, the support adjustment assembly, through the synergistic action of the support, the adjusting component and the locking ring, changes the support height by utilizing the cooperation relationship between the adjusting component and the support, and maintains the adjusted state by the locking force of the locking ring, thereby realizing the adjustment and stable fixation of the support height of the table and the entire welding device, and preventing the table from shaking or settling during the welding process. Attached Figure Description

[0023] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0024] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the welding device for the left and right main beams of the rear underframe of the wind turbine nacelle according to this utility model; Figure 2 This is a schematic diagram of the assembly welding device; Figure 3 This is a cross-sectional schematic diagram of the adjustment seat assembly; Figure 4 A schematic diagram of the height adjustment component; Figure 5 This is a schematic diagram of the end positioning component. Figure 6 This is a structural schematic diagram of the locking component; Figure 7 for Figure 2 Enlarged view of point A in the middle; Figure 8 A schematic diagram of the structure supporting the adjustment components; Figure label: 1. Tabletop; 11. Bracket; 12. Support and adjustment assembly; 121. Support; 122. Adjusting component; 123. Locking ring; 2. Main beam; 21. Flange plate; 22. Web plate; 3. Support mechanism; 31. Positioning plate; 311. Buffer layer; 32. Anti-tilt plate; 321. Arc; 33. Fixing column; 34. Cam handle; 4. Adjustment mechanism; 5. Adjusting seat assembly; 51. Base; 52. Adjusting bolt; 53. Locking nut; 54. Spherical pad; 541. Elastic element; 6. Height adjustment assembly; 61. Support base; 62. Mounting slot; 63. Support plate; 64. Adjusting screw; 65. Fastener; 7. End positioning assembly; 71. Shaft seat; 72. Fixed shaft; 73. End plate; 74. Locking component; 741. Stop block; 742. Tension locking handle; 743. T-bolt; 744. C-groove. Detailed Implementation

[0025] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] Example 1: A preferred embodiment, such as Figure 1 , Figure 2 and Figure 7 As shown, a welding device for the left and right main beams 2 of the rear underframe of a wind turbine nacelle is installed on a platform 1. The main beam 2 includes a flange plate 21 and a web plate 22. The flange plate 21 is further divided into an upper flange plate 21 and a lower flange plate 22. The welding device includes a support mechanism 3 for adjusting the planar bending deflection of the web plate 22 and supporting the flange plate 21, and an adjustment mechanism 4 for adjusting the height of the main beam 2. The welding assembly is fixedly installed on the platform 1. First, the flange plate 21 is hoisted between the positioning plate 31 and the anti-tilt plate 32, so that the side of the flange plate 21 is in close contact with the buffer layer 311 of the positioning plate 31. The positioning plate 31 is used to initially position the flange plate 21 horizontally. At this time, the buffer layer 311 undergoes elastic deformation under the pressure of the flange plate 21, absorbing the impact force during the contact process and preventing indentations or scratches on the surface of the flange plate 21. At the same time, it is ensured that the other side of the flange plate 21 corresponds to the anti-tilt plate 32. The anti-tilt plate 32 provides support for the flange plate 21 to prevent it from tipping over in the initial placement. When the arc 321 surface of the anti-tilt plate 32 contacts the flange plate 21, the contact position is automatically adjusted through surface adaptation, so that stable contact can be guaranteed even if there is a slight positional deviation of the flange plate 21.

[0031] Subsequently, the height of the lower adjusting seat device is adjusted so that the center of the upper flange plate 21 is parallel to the platform 1, and the center height meets the requirements. The adjusting seat device nut is then tightened. Based on the longitudinal variable cross-section angle of the main beam 2, the rotation angle of the end positioning device is adjusted to be flush with the end face of the upper flange plate 21. Next, the web plate 22 is hoisted onto the height adjusting device. The height device is adjusted so that the center of the web plate 22 is parallel to the center of the main beam 2. The center distance is measured, and the dimensions are precisely adjusted. The end of the web plate 22 is flush with the end plate of the end positioning device. Then, the lower flange plate 21 is hoisted. The height of the lower adjusting seat device is adjusted so that the center of the upper flange plate 21 is parallel to the platform 1, and the center height meets the requirements. The adjusting seat device nut is tightened, and the end is flush with the end plate of the end positioning device. The cam handle 34 is installed on the fixed column 33. Rotating the handle, through the eccentric wheel 341, drives the lower flange plate 21 and web plate 22 together, fixing them together with the upper flange plate 21, ensuring the joint is flush. The weld seams are symmetrically tack welded to meet the welding requirements. After all positioning and adjustment work is completed, the flange plate 21 and web plate 22 can be welded together. During the welding process, all components of the device remain stable, providing reliable support for welding. After welding is completed, the fixing and adjusting components are loosened in the reverse order of the above steps, and finally the welded main beam 2 is removed from the device, completing one welding cycle.

[0032] Example 2: like Figure 3 As shown, a welding device for the left and right main beams of the rear underframe of a wind turbine nacelle differs from Embodiment 1. The adjusting seat assembly 5 includes a base 51 fixed on a platform 1, an adjusting bolt 52 connected to the base 51, a locking nut 53 sleeved on the adjusting bolt 52, and a spherical pad 54 disposed on the adjusting bolt 52. The flange plate 21 is placed in the working area of ​​the adjusting seat assembly 5, so that the side of the flange plate 21 contacts the spherical pad 54 on top of the adjusting bolt 52. The spherical pad 54, through its spherical structure, adheres to the side of the flange plate 21, initially bearing the weight of the flange plate 21. At this time, the spherical pad 54 can automatically adjust the contact angle according to the actual state of the side of the flange plate 21, such as slight tilt or local unevenness, to avoid excessive local stress or unstable support of the flange plate 21 due to hard contact.

[0033] The operator needs to adjust the height of the adjusting seat device to make the center of the upper flange plate 21 parallel to the table surface 1, and rotate the adjusting bolt 52: if it is necessary to raise the height of the flange plate 21, rotate the adjusting bolt 52 clockwise, and the adjusting bolt 52 moves upward through the threaded transmission with the base 51, driving the spherical pad 54 and the flange plate 21 to rise synchronously; if it is necessary to lower the height of the flange plate 21, rotate the adjusting bolt 52 counterclockwise, and the adjusting bolt 52 moves downward, and the flange plate 21 descends synchronously with the spherical pad 54 under its own weight or with the assistance of a slight external force. After the center height of the flange plate 21 is adjusted to the target value, keep the position of the adjusting bolt 52 unchanged, rotate the locking nut 53 sleeved on the adjusting bolt 52, so that the locking nut 53 moves downward and fits tightly against the upper surface of the base 51, continue to tighten the locking nut 53, and use the friction between the locking nut 53 and the base 51 and the self-locking characteristics of the thread to fix the position of the adjusting bolt 52, preventing it from loosening or rotating under subsequent welding operations or external forces, and ensuring the height of the flange plate 21 is stable.

[0034] Furthermore, an elastic element 541 is connected to one end of the spherical pad 54 facing away from the flange plate 21, and the other end of the elastic element 541 is connected to the adjusting bolt 52. The elastic element 541 is a limiting spring. When the flange plate 21 is placed on the spherical pad 54, the weight of the flange plate 21 causes the spherical pad 54 to compress the limiting spring downwards, and the spring generates an upward elastic reaction force. When the height of the flange plate 21 is adjusted by rotating the adjusting bolt 52 according to the design requirements, the adjusting bolt 52 moves upwards, pushing the limiting spring to compress further. The spring force increases with the increase of the compression, and pushes the flange plate 21 upwards through the spherical pad 54. At this time, the elastic buffering effect of the spring can avoid rigid impact during height adjustment, ensuring that the flange plate 21 rises smoothly; otherwise, the spherical pad 54 always maintains close contact with the flange plate 21 to prevent unstable support caused by excessive adjustment speed. Example 3: like Figure 4 As shown, a welding device for the left and right main beams of the rear base frame of a wind turbine nacelle, different from embodiment 1, fixes the support base 61 on the platform 1 to ensure that the support base 61 is perpendicular and stable to the platform 1, providing a reference for subsequent adjustment; the support plate 63 is embedded in the mounting groove 62 of the support base 61, so that the support plate 63 can slide freely up and down along the inner wall of the mounting groove 62 without jamming or loosening; one end of the adjusting screw 64 is fixed in the threaded hole on the side of the support base 61, and the other end passes through the corresponding hole of the support plate 63. The fastener 65 (such as a double nut) is sleeved on the adjusting screw 64 and contacts the side of the support plate 63. At this time, the support plate 63 is in the initial height position.

[0035] When the web plate 22 is placed on the support plate 63, the weight of the web plate 22 causes the support plate 63 to contact the bottom of the mounting groove 62. At this time, the support plate 63 provides initial support for the web plate 22. Subsequently, according to the design requirements of the center height of the web plate 22, the height adjustment begins. If it is necessary to raise the height of the web plate 22, rotate the adjusting screw 64 clockwise. Under the action of the threaded transmission, the fastener 65 connected to the adjusting screw 64 will move along the screw towards the support seat 61. Since the fastener 65 is connected to the support plate 63, the fastener 65 drives the support plate 63 to slide upward in the mounting groove 62, and the support plate 63 pushes the web plate 22 to rise synchronously. Otherwise, the opposite is true. When the center height of the web plate 22 reaches the design requirements, stop rotating the adjusting screw 64. If a double nut structure is used at this time, first keep the position of the fastener 65 in contact with the support plate 63 unchanged, rotate the locking nut 53 on the other side to make it fit tightly against the side of the support seat 61, and lock the position of the adjusting screw 64 by the friction between the two nuts.

[0036] Example 4: like Figure 5 and Figure 6 As shown, a welding device for the left and right main beams 2 of the rear underframe of a wind turbine nacelle differs from Embodiment 1. The end positioning component 7 includes a bearing 71, a fixed shaft 72 fixed on the bearing 71, and an end plate 73 disposed on the fixed shaft 72. A locking element 74 is provided at the end of the end plate 73 away from the fixed shaft 72. The bearing 71 is fixed to the platform 1 by bolts or other connecting parts to provide a correct reference for subsequent end positioning. One end of the fixed shaft 72 is bolted to the bearing 71 and extends along the height direction of the main beam 2, serving as the pivot of the end plate 73. The end plate 73 is sleeved on the fixed shaft 72, and the initial position of the end plate 73 on the fixed shaft 72 is adjusted to make it approximately aligned with the preset positioning surface at the end of the main beam 2. After the flange plate 21 and web plate 22 have completed height adjustment and joint alignment, the position of the end plate 73 is finely adjusted. One side of the end plate 73 rotates axially along the fixed shaft 72, and the locking piece 74 on the other side moves along the C-shaped groove 744 until the end of the main beam 2 is tightly fitted with the positioning surface of the end plate 73. At this time, the end plate 73 restricts the displacement of the main beam 2 through rigid contact, and the main beam 2 is completely restricted from displacement. Then, the locking piece 74 at the end of the end plate 73 away from the fixed shaft 72 is operated to lock it.

[0037] Meanwhile, when the locking component 74 includes a stop 741 on the end plate 73, a tension locking handle 742 fixed to the stop 741, a T-bolt 743 connecting the tension locking handle 742, and a C-groove 744 on the platform 1 that moves in conjunction with the T-bolt 743, after the end of the main beam 2 is initially positioned by fitting against the end plate 73, pressing the tension locking handle 742 downwards uses the lever principle to drive the T-bolt 743 upwards within the C-groove 744. The head of the T-bolt 743 makes close contact with the upper wall of the C-groove 744, generating pressure. As the handle is continuously pressed, the pressure is transmitted through the tension locking handle 742 to the stop 741, causing the end plate 73 to press tightly against the platform 1, firmly locking the end of the main beam 2 in its current position and preventing displacement during the welding process.

[0038] Example 5: like Figure 8 As shown, a welding device for the left and right main beams 2 of the rear underframe of a wind turbine nacelle differs from Embodiment 1. A platform 1 is connected to a bracket 11, and the bracket 11 is equipped with a support adjustment assembly 12. The support adjustment assembly 12 includes a support 121 connected to the end of the bracket 11 facing away from the platform 1, an adjustment component 122 cooperating with the support 121, and a locking ring 123 for locking the adjustment component 122 and the support 121. The support height is adjusted according to actual needs, such as ground flatness adjustment or welding height adaptation. If it is necessary to raise the height of the platform 1, the adjustment component 122 is rotated to extend outward relative to the support 121, increasing the combined length of the adjustment component 122 and the support 121, thus causing the bracket 11 and the platform 1 to rise synchronously. During the ascent, use a level or measuring tool to monitor the height and levelness of the platform 1, ensuring that the heights of all support adjustment components 12 remain consistent to prevent the platform 1 from tilting. If it is necessary to lower the height of the platform 1, rotate the adjustment component 122 in the opposite direction, causing it to retract inward relative to the support 121. This shortens the combined length of the adjustment component 122 and the support 121, causing the bracket 11 and the platform 1 to descend accordingly. Once the height of the platform 1 is adjusted to the appropriate position and level is confirmed, operate the locking ring 123 to lock the adjustment component 122 and the support 121. By rotating the locking ring 123, it is made to fit tightly against the support 121 and the adjustment component 122. The friction between the locking ring 123 and both, or the mechanical locking structure, fixes the position of the adjustment component 122, preventing it from loosening or shifting under the weight of the platform 1 and the device, thus ensuring that the support height remains stable. For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0039] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0040] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A welding device for the left and right main beams (2) of the rear underframe of a wind turbine nacelle, mounted on a platform (1), wherein the main beam (2) includes a flange plate (21) and a web plate (22), characterized in that, It includes a support mechanism (3) for adjusting the planar bending deflection of the web (22) and supporting the flange (21), and an adjustment mechanism (4) for adjusting the height of the main beam (2). The support mechanism (3) includes a positioning plate (31) for supporting the side of the flange plate (21), an anti-tipping plate (32) for preventing the flange plate (21) from tipping over, and a fixing column (33) for supporting the web plate (22). The fixing column (33) is provided with a cam handle (34) for adjusting the joint between the flange plate (21) and the web plate (22). The adjustment mechanism (4) includes an adjustment seat assembly (5) for adjusting the center height of the flange (21), a height adjustment assembly (6) for adjusting the center height of the web (22), and an end positioning assembly (7) for improving the positioning accuracy of the main beam (2).

2. The welding device for the left and right main beams (2) of the rear underframe of the wind turbine nacelle according to claim 1, characterized in that, The adjusting seat assembly (5) includes a base (51) fixed on the platform (1), an adjusting bolt (52) connected to the base (51), a locking nut (53) sleeved on the adjusting bolt (52), and a spherical pad (54) provided on the adjusting bolt (52).

3. The welding device for the left and right main beams (2) of the rear underframe of the wind turbine nacelle according to claim 2, characterized in that, An elastic element (541) is connected between the spherical pad (54) and the adjusting bolt (52).

4. The welding device for the left and right main beams (2) of the rear underframe of the wind turbine nacelle according to claim 1, characterized in that, The height adjustment assembly (6) includes a support base (61), a mounting groove (62) provided on the support base (61), a support plate (63) provided in the mounting groove (62), and an adjustment screw (64) fixed on one side of the support base (61). The adjustment screw (64) is provided with a fastener (65) connecting to the support plate (63) so as to adjust and fix the height of the support plate (63) by adjusting the fastener (65).

5. The welding device for the left and right main beams (2) of the rear underframe of the wind turbine nacelle according to claim 1, characterized in that, The end positioning assembly (7) includes a bearing seat (71), a fixed shaft (72) fixed on the bearing seat (71), and an end plate (73) provided on the fixed shaft (72). A locking member (74) is provided at the end of the end plate (73) away from the fixed shaft (72).

6. The welding device for the left and right main beams (2) of the rear underframe of the wind turbine nacelle according to claim 5, characterized in that, The locking component (74) includes a stop (741) on the end plate (73), a tension locking handle (742) fixed on the stop (741), a T-bolt (743) connecting the tension locking handle (742), and a C-groove (744) on the table (1) that moves in conjunction with the T-bolt (743).

7. The welding device for the left and right main beams (2) of the rear underframe of the wind turbine nacelle according to claim 1, characterized in that, The positioning plate (31) has a buffer layer (311) on the side facing the flange plate (21), and the anti-tilt plate (32) has an arc (321) on the side facing the flange plate (21).

8. The welding device for the left and right main beams (2) of the rear underframe of the wind turbine nacelle according to claim 1, characterized in that, The cam handle (34) is provided with an eccentric wheel (341) to fix the flange (21) and the web (22) through the eccentric wheel (341).

9. The welding device for the left and right main beams (2) of the rear underframe of the wind turbine nacelle according to claim 1, characterized in that, The tabletop (1) is connected to a bracket (11), and the bracket (11) is provided with a support adjustment assembly (12). The support adjustment assembly (12) includes a support (121) connected to one end of the bracket (11) facing away from the tabletop (1), an adjustment member (122) cooperating with the support (121), and a locking ring (123) for locking the adjustment member (122) and the support (121).

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