Alignment tool and method for connecting a blade to a pitch bearing

Abstract

The embodiment of the application discloses an alignment tool and a blade and variable pitch bearing alignment and connection method. The alignment tool is used for connecting a blade and a flange. The alignment tool comprises a trial assembly structure, a plurality of pilot holes, and a plurality of pilot members. The trial assembly structure comprises a first end face and a second end face arranged oppositely and at intervals and a plurality of pilot holes penetrating through the first end face and the second end face. The plurality of pilot holes are distributed at intervals along the circumference of the trial assembly structure. The plurality of pilot members comprise connecting sections and limiting sections distributed along the length direction of the pilot members. The connecting sections are used for being connected with connecting holes on the blade. The limiting sections are used for being matched with the pilot holes. The size of the limiting section is matched with the inner diameter size of the pilot hole. The alignment tool and the blade and variable pitch bearing alignment and connection method provided by the embodiment of the application can effectively eliminate the blade bolt jamming, breakage, and other adverse hidden dangers between the blade and the variable pitch bearing in the process of driving the subsequent blade by wind, and further damage the blade and the variable pitch bearing structure.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application belongs to the technical field of wind turbine generators, and particularly relates to an alignment tool and a blade and variable-pitch bearing alignment and connection method. BACKGROUND

[0002] In the blade installation process of a wind turbine generator, a blade needs to be fixedly connected with a variable-pitch bearing through a blade bolt, and this process is also referred to as a blade and variable-pitch bearing connection and assembly. There are mainly two connection and assembly modes of the blade and variable-pitch bearing, the first connection mode needs to drill axial and radial holes at the blade root of the blade, then install a T-shaped nut in the corresponding holes, and finally connect a T-shaped bolt matched with the T-shaped nut; the second connection mode is to pre-place a bolt sleeve during the forming process of the blade, the bolt sleeve is integrally formed with the blade, and finally a bolt matched with the bolt sleeve is connected.

[0003] In the above two connection and assembly modes, a flange needs to be installed to accurately position the blade root (blade root portion), and it is necessary to ensure that the center straight lines of the connection holes of the blade root portion, the flange holes of the flange, and the pilot holes of the variable-pitch bearing are aligned, so as to ensure the connection accuracy of the blade and the variable-pitch bearing. However, in the actual alignment and connection process, the installation of the flange is manually aligned and connected, and the manual alignment and connection of the flange lacks necessary hard limiting, which causes the flange to easily deviate during the installation process, and finally causes the blade bolt between the blade and the variable-pitch bearing to deviate greatly, the flange and the variable-pitch bearing cannot be accurately aligned and connected, and the blade bolt between the blade and the variable-pitch bearing is jammed or even broken during the wind driving process of the blade, and the blade and the variable-pitch bearing are damaged. SUMMARY

[0004] The embodiment of the present application aims to at least solve one of the technical problems existing in the prior art. To this end, the embodiment of the present application provides an alignment tool and a blade and variable-pitch bearing alignment and connection method, which solves the technical problem of alignment during the connection of the blade and the variable-pitch bearing.

[0005] According to one aspect of the embodiment of the present application, an alignment tool is provided, which is used for connecting a blade and a flange, and the alignment tool comprises: a trial assembly structure member, comprising a first end face and a second end face oppositely and spaced apart, and a plurality of pilot holes penetrating through the first end face and the second end face, the plurality of pilot holes are distributed along the circumference of the trial assembly structure member; a plurality of pilot members, the pilot member comprises a connecting segment and a limiting segment distributed along the length direction of the pilot member, the connecting segment is used for connecting with a connection hole on the blade, the limiting segment is used for penetratingly matched with the pilot hole, and the size of the limiting segment is matched with the inner diameter size of the pilot hole.

[0006] Optionally, the connecting segment and the limiting segment of the pilot member are integrally formed.

[0007] Optionally, a reinforcing structure is further included, which is used to abut against the inner wall of the blade to support the inner wall of the blade.

[0008] Optionally, the material of the trial fitting structure is metal or plastic.

[0009] According to another aspect of the embodiments of the present application, a method for aligning a blade and a pitch bearing is further provided, comprising:

[0010] providing the alignment tool as described above;

[0011] mounting a plurality of the alignment members at the blade root end surface of the blade, inserting the connecting section of the alignment member into the connecting hole on the blade root end surface, and making the limiting section of the alignment member protrude out of the connecting hole;

[0012] passing the flange hole on the flange through the corresponding alignment member and making the end surface of the flange abut against the blade root end surface of the blade;

[0013] sleeving the alignment hole on the trial fitting structure on the limiting section of the alignment member and making the first end surface of the trial fitting structure abut against the end surface of the flange away from the blade, so that the connecting hole, the flange hole and the alignment hole are coaxially aligned for alignment;

[0014] fixing the flange after alignment with the blade on the blade root end surface of the blade, and disassembling and removing the alignment tool;

[0015] aligning and connecting the pitch bearing with the blade through the blade bolt.

[0016] Optionally, a plurality of positioning pins are detachably arranged on the trial fitting structure, a plurality of positioning pin holes are arranged on the flange, and a plurality of alignment holes are arranged on the blade.

[0017] The step of fixing the flange after alignment with the blade on the blade root end surface of the blade comprises:

[0018] passing and connecting the positioning pin holes and the alignment holes in sequence by the positioning pins, so that the flange is fixed on the blade root end surface of the blade; and disassembling and removing the alignment tool.

[0019] Optionally, the method further comprises the following steps after the step of fixing the flange after alignment with the blade on the blade root end surface of the blade, and disassembling and removing the alignment tool:

[0020] inserting and connecting one end of the blade bolt into the connecting hole after passing the flange hole, and making the other end of the blade bolt protrude out of the end surface of the flange away from the blade;

[0021] The pilot hole on the test fitting structure is sleeved on the blade bolt, and the first end surface of the test fitting structure is attached to the end surface of the flange away from the blade, so as to detect whether the alignment of the blade bolt, the flange hole and the connecting hole is offset.

[0022] Optionally, the method further comprises providing a reinforcing structure to reinforce the inner wall of the blade.

[0023] Optionally, the reinforcing structure is a support column, and two ends of the support column are respectively capable of abutting against the inner wall of the blade in the radial direction.

[0024] Optionally, the reinforcing structure comprises a base disc and a plurality of support rods arranged on the base disc in the circumferential direction, the support rods are detachably connected with the base disc, and one end of each of the support rods away from the base disc is used for fixedly connecting to the blade bolt or the inner wall of the blade.

[0025] The alignment tool and the method for aligning and connecting the blade and the variable pitch bearing according to the embodiments of the present application have at least the following beneficial effects:

[0026] The alignment tool and the method for aligning and connecting the blade and the variable pitch bearing provided by the embodiments of the present application can first align the flange holes on the flange and the connecting holes on the blade one by one through the guiding and positioning of the pilot, and then simulate the assembly of the variable pitch bearing by means of the test fitting structure, so that the pilot hole on the test fitting structure, the flange hole on the flange and the connecting hole on the blade are aligned one by one when the test fitting structure, the flange and the blade are attached in sequence, and then the flange is fixed on the blade, thereby avoiding the offset or misalignment of the flange on the blade, achieving the effect of accurately aligning the pilot hole on the test fitting structure, the flange hole on the flange and the connecting hole on the blade, and effectively eliminating the adverse hidden dangers such as the jamming and breaking of the blade bolt between the blade and the variable pitch bearing during the subsequent wind-driven process of the blade, and further damaging the blade and the variable pitch bearing structure. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0028] Figure 1 is a structural schematic diagram of a test fitting structure provided by the embodiments of the present application;

[0029] Figure 2 is another structural schematic diagram of a test fitting structure provided by the embodiments of the present application.

[0030] Figure 3 is a structural schematic diagram of a guide piece provided by an embodiment of the present application;

[0031] Figure 4 is a sectional view of a flange or a sectional view of a blade end provided by an embodiment of the present application;

[0032] Figure 5 is a matching structural schematic diagram of an alignment tool, a flange and a blade provided by an embodiment of the present application;

[0033] Figure 6 is a matching structural schematic diagram of a reinforcing structural piece, a flange and a blade in an embodiment of the present application;

[0034] Figure 7 is another matching structural schematic diagram of a reinforcing structural piece, a flange and a blade in an embodiment of the present application.

[0035] In the drawings: the trial fitting structural piece 100; the first end face 110; the second end face 120; the guide hole 130; the guide piece 200; the connecting section 210; the limiting section 220; the transition section 230; the flange 300; the flange hole 310; the positioning pin hole 320; the reinforcing structural piece 400; the base disc 410; the support rod 420; the positioning pin 500; the blade 600; the blade bolt 700. DETAILED DESCRIPTION

[0036] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some of these specific details. The description of the embodiments is merely to provide a better understanding of the present application by showing examples of the present application.

[0037] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0038] In the description of the embodiments of the present application, several meanings are one or more, multiple meanings are two and more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0039] In the description of the embodiments of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0040] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below with reference to the drawings.

[0041] Please refer to Figures 1 to 5 It should be noted that when the blade 600 is connected with the pitch bearing, it needs to be assisted by the corresponding flange 300 for positioning and centering. In order to make the blade bolt 700 accurately connect the blade 600 and the pitch bearing, it is necessary to ensure that the connecting hole (not shown in the figure) on the blade 600, the flange hole 310 on the flange 300 and the bolt hole on the pitch bearing are coaxially centered.

[0042] Therefore, the embodiments of the present application provide an alignment tool for connecting a blade and a flange. The alignment tool comprises a trial fitting structure 100 and a plurality of guide members 200. The trial fitting structure 100 comprises a first end face 110 and a second end face 120 arranged opposite and spaced apart, and a plurality of guide holes 130 penetrating through the first end face 110 and the second end face 120. The plurality of guide holes 130 are distributed along the circumference of the trial fitting structure 100. The guide member 200 comprises a connecting segment 210 distributed along the length direction of the guide member 200, and a limiting segment 220. The connecting segment 210 is used to connect with the connecting hole on the blade 600. The limiting segment 220 is used to cooperate with the guide hole 130. The size of the limiting segment 220 is adapted to the inner diameter size of the guide hole 130.

[0043] In the alignment tool of the embodiments of the present application, the trial fitting structure 100 plays a role of simulating the pitch bearing. The plurality of guide holes 130 on the trial fitting structure 100 simulate the bolt holes on the actual pitch bearing. The first end face 110 and the second end face 120 on the trial fitting structure 100 simulate the two opposite end faces on the actual pitch bearing. The guide member 200 simulates the blade bolt used for connecting the actual pitch bearing and the blade 600.

[0044] It needs to be understood that the part on the blade 600 connected with the pitch bearing is the blade end, which is also called the blade root, and the blade end is provided with a plurality of connecting holes in the circumferential direction. The connecting holes can be artificial positioning holes or threaded holes, and of course, the connecting holes can also be bolt sleeves pre-set during the molding of the blade 600. The plurality of bolt sleeves are embedded in the blade end in the circumferential direction and are integrally formed with the blade 600.

[0045] In addition, the pilot 200 is rod-shaped, and the connecting section 210 on the pilot 200 is preferably a threaded section threadedly connected with the connecting hole. The length of the connecting section 210 is equal to the depth of the connecting hole, so as to ensure the stability and easy dismounting of the pilot 200 connected with the connecting hole. Of course, the connecting section 210 on the pilot 200 can also be a shaft section achieving interference fit with the connecting hole, or the connecting section 210 on the pilot 200 can be fastened with the connecting hole through the way of gluing. In addition, the outer diameter size of the limiting section 220 on the pilot 200 is adapted to the outer diameter size of the pilot hole 130 on the trial assembly structure 100, that is, the outer diameter of the limiting section 220 on the pilot 200 is equal to or slightly smaller than the inner diameter of the pilot hole 130, so as to ensure that, after the connecting section 210 of the pilot 200 is stably connected with the connecting hole, the pilot hole 130 of the trial assembly structure 100 can be stably sleeved on the limiting section 220 of the pilot 200, eliminating the fitting gap between the pilot hole 130 and the limiting section 220, and preventing the trial assembly structure 100 from being offset or misaligned in the vertical position.

[0046] In actual use, the alignment tool of the embodiment of the application is used. The installer first inserts the connecting section 210 of the pilot 200 into the connecting hole on the blade 600, so that the pilot 200 is stably fixed on the end face of the blade 600. At this time, the limiting section 220 of the pilot 200 protrudes from the connecting hole. The installer then correspondingly assembles the flange 300. The flange hole 310 of the flange 300 is fitted on the end face of the blade 600 after passing through the limiting section 220 of the pilot 200, so that the flange hole 310 on the flange 300 is centered with the connecting hole on the blade 600 through the pilot 200. Then, in order to prevent the flange 300 from rotating and being offset in the circumferential direction, the installer can fix the flange 300 to the end face of the blade 600 through the corresponding fixing member, so as to avoid the misalignment of the flange hole 310 on the flange 300 and the connecting hole. After the flange 300 is fixed, the installer stably sleeves the pilot hole 130 on the trial assembly structure 100 on the limiting section 220 of the pilot 200 and makes the first end face 110 of the trial assembly structure 100 abut and fit on the end face of the flange 300 away from the blade 600, so as to complete the centering and connecting of the trial assembly structure 100 and the blade 600.

[0047] Obviously, the alignment tool provided by the embodiment of the present application realizes the purpose of pre-positioning or debugging the alignment position of the actual variable pitch bearing, the flange 300 and the blade 600 by the arrangement of the trial fitting structural member 100 and the guide member 200, thereby ensuring the accurate centering connection between the subsequent blade and the actual variable pitch bearing.

[0048] In some embodiments of the alignment tool of the present application, referring back to Figure 1 、 Figure 2 and Figure 3 , the connecting section 210 and the limiting section 220 of the guide member 200 are integrally formed, thereby reducing the mold cost of separately processing the connecting section 210 and the limiting section 220.

[0049] Specifically, in one embodiment, the guide member 200 is a guide rod, and the connecting section 210 and the limiting section 220 are two ends of the guide rod. Since the connecting hole on the blade 600 is preferably a pre-buried bolt sleeve, the connecting section 210 connected with the connecting hole is also preferably a threaded section, so as to realize the fastening connection between the connecting section 210 and the bolt sleeve.

[0050] In another embodiment, referring back to Figure 3 , the guide member 200 is in the form of a rod, and the guide member 200 further comprises a transition section 230. The connecting section 210 is connected with the limiting section 220 through the transition section 230 and is processed as an integral piece. By arranging the guide member 200 into three sections, the connecting section 210 corresponds to the connecting hole on the blade 600, the transition section 230 is correspondingly sleeved and fitted with the flange hole 310 on the flange 300, and the limiting section 220 is tightly fitted with the guide hole 130 on the trial fitting structural member 100, thereby facilitating the installation personnel to accurately assemble the flange 300 and the trial fitting structural member 100 at the corresponding positions of the guide member 200, and improving the fitting accuracy of the guide member 200 with the blade 600, the flange 300 and the trial fitting structural member 100. In addition, in order to facilitate the distinction between the connecting section 210, the transition section 230 and the limiting section 220, the outer diameter of the transition section 230 is slightly smaller than the outer diameters of the connecting section 210 and the limiting section 220, and at the same time, the outer diameter of the transition section 230 is also slightly smaller than the inner diameter of the flange hole 310. In addition, the guide member 200 can be a hollow rod or column structure, thereby reducing the manufacturing cost of the entire guide member 200.

[0051] Of course, in other embodiments, in order to improve the adaptability of the guide member 200, the guide member 200 can be an externally threaded cylinder, such as a double-headed bolt or other general threaded parts, thereby facilitating the selection and replacement of the installation personnel.

[0052] In some embodiments of the alignment tool of the present application, referring back to Figure 1 and Figure 2The size and shape of the trial assembly structure 100 are matched with the size and shape of the pitch bearing, that is, the overall profile parameters of the trial assembly structure 100 are consistent with the overall profile parameters of the actual pitch bearing, so that the trial assembly structure 100 can simulate and match the shape of the pitch bearing as much as possible, and the subsequent alignment and connection accuracy of the pitch bearing and the blade is improved.

[0053] Of course, in order to improve the assembly efficiency of the trial assembly structure 100, the number of the guide members 200 can not be equal to the number of the guide holes 130 on the trial assembly structure 100, and the number of the guide members 200 can only ensure that the trial assembly structure 100 is stably attached to the end face of the flange 300, which is convenient for the subsequent installer to disassemble the entire alignment tool.

[0054] In addition, the material of the trial assembly structure 100 is metal or plastic. When the material of the trial assembly structure 100 is metal, the structural stability of the trial assembly structure 100 and the entire alignment tool can be ensured. When the material of the trial assembly structure 100 is plastic, the lightweight design of the trial assembly structure 100 and the entire alignment tool can be achieved, which reduces the processing cost of the entire alignment tool, and further facilitates the subsequent installer to disassemble the entire alignment tool.

[0055] In some embodiments of the alignment tool of the present application, referring to Figure 5 and Figure 6 The reinforcing structure 400 is used to abut against the inner wall of the blade 600 to support the inner wall of the blade 600. It should be understood that considering that the blade 600 is mainly made of resin material, the blade 600 will be deformed due to its own gravity or collision with external objects during normal use or transportation, pre-assembly with the trial assembly structure 100, and alignment and connection with the actual pitch bearing. In addition, the blade 600 is prone to shrinkage deformation under extreme weather conditions. Therefore, the reinforcing structure 400 effectively plays a role in reinforcing the blade 600. The two ends of the reinforcing structure 400 are respectively abutted against the inner wall of the blade 600, and the supporting effect of the reinforcing structure 400 can effectively prevent the blade 600 from shrinking and deforming inward, which not only improves the structural strength of the entire blade 600, but also avoids the misalignment of the connecting holes on the blade 600 with the flange holes 310 and the bolt holes on the pitch bearing, and further avoids the inaccurate centering of the blade, the flange and the pitch bearing.

[0056] Specifically, referring to Figure 4 and Figure 6In some embodiments of the alignment tool of the present application, the reinforcing structure 400 is a support column, and it should be understood that the cross section of the blade 600 at the end is circular or elliptical, the shape of the blade 600 near the end is hollow cylindrical, and the end of the blade 600 is an opening for the pitch bearing. When the blade 600 needs to be reinforced, the installer can radially abut the two ends of the support column against the inner wall of the blade 600 near the end, thereby providing mechanical support to the blade 600. Of course, in order to make the blade 600 receive more uniform support from the reinforcing structure 400, multiple support columns can be provided, which are arranged in cross and abut against the inner wall of the blade 600 at different positions, so that the inner wall of the blade 600 receives uniform force, further preventing the blade 600 from structural deformation due to its own gravity or external force, and further ensuring the structural stability of the entire blade.

[0057] In addition, the embodiment of the present application also provides a method for aligning and connecting a blade and a pitch bearing, comprising: providing the alignment tool described above; installing multiple pilot members 200 at the blade root end surface of the blade 600, inserting the connecting section 210 of the pilot member 200 into the connecting hole on the blade root end surface of the blade 600, and making the limiting section 220 of the pilot member 200 protrude out of the connecting hole; passing the flange hole 310 on the flange 300 through the corresponding pilot member 200 and making the end surface of the flange 300 abut on the blade root end surface of the blade 600; sleeving the pilot hole 130 on the trial assembly structure 100 on the limiting section 220 of the pilot member 200 and making the first end surface 110 of the trial assembly structure 100 abut on the end surface of the flange 300 away from the blade 600, so that the connecting hole, the flange hole 310 and the pilot hole 130 are coaxially centered for alignment; fixing the flange 300 aligned with the blade 600 on the blade root end surface of the blade 600, and disassembling and removing the alignment tool; aligning and connecting the pitch bearing and the blade 600 through the blade bolt 700.

[0058] It can be understood that the blade and variable pitch bearing alignment connection method provided by the embodiment of the application, through the setting of the trial assembly structure 100 and the guide piece 200, the trial assembly structure 100 simulates the structure of the actual variable pitch bearing, and the guide piece 200 simulates the structure of the blade bolt. The flange hole 310 on the flange 300 can be accurately aligned with the connecting hole on the blade 600 in the flange 300 and blade 600 assembly process by means of the guiding and positioning effect of the guide piece 200. Then the trial assembly structure 100 is used to simulate the assembly of the variable pitch bearing, so that the guide hole 130 on the trial assembly structure 100, the flange hole 310 on the flange 300 and the connecting hole on the blade 600 are aligned one by one when the trial assembly structure 100, the flange 300 and the blade 600 are sequentially end face adhered. Then the flange 300 is fixed on the end face of the blade 600, avoiding the offset or misalignment of the flange 300 on the blade 600, avoiding the interference between the flange hole 310 and the connecting hole, and achieving the effect of accurately aligning the guide hole 130 on the trial assembly structure 100, the flange hole 310 on the flange 300 and the connecting hole on the blade 600.

[0059] It should be understood that after the guide hole 130 on the trial assembly structure 100, the flange hole 310 on the flange 300 and the connecting hole on the blade 600 are accurately aligned, and the flange 300 is stably fixed, the guide piece 200 and the trial assembly structure 100 are disassembled as a whole. After the flange hole 310 on the flange 300 and the connecting hole on the blade 600 are accurately coaxially aligned, the assembly position of the blade bolt 700 and the actual variable pitch bearing is also determined. Finally, when the blade 600 is aligned and connected with the actual variable pitch bearing, the installer only needs to insert the end of the corresponding blade bolt 700 through the flange hole 310 and connect it in the connecting hole on the blade 600. Then the actual variable pitch bearing is sleeved and connected on the other end of the blade bolt 700. After the end face of the variable pitch bearing close to the blade 600, the end face of the flange 300 and the end face of the blade 600 are fixed and adhered, the alignment and connection assembly of the blade 600 and the variable pitch bearing is completed, the connection accuracy of the blade 600 and the variable pitch bearing is ensured, and the blade bolt 700 between the blade 600 and the variable pitch bearing is effectively eliminated, which avoids the subsequent damage of the blade and the variable pitch bearing structure and other adverse hidden troubles in the process of driving the blade 600 by wind.

[0060] In some embodiments of the blade and variable pitch bearing alignment connection method of the application, referring again to Figure 4 and Figure 5In order to stably fix the flange 300 on the end face of the blade 600 and avoid the flange 300 from slipping or mispositioning on the end face of the blade 600, a plurality of positioning pins 500 are detachably arranged on the trial assembly structure 100, a plurality of positioning pin holes 320 are arranged on the flange 300, and a plurality of alignment holes (not shown in the figure) are arranged on the blade 600. The steps of fixing the flange 300 on the blade root end face of the blade 600 after aligning the flange 300 with the blade 600 include: sequentially connecting the positioning pin 500 with the positioning pin hole 320 and the alignment hole to fix the flange 300 on the blade root end face of the blade 600, and then removing the alignment tool.

[0061] By arranging the plurality of positioning pin holes 320 on the flange 300 and the corresponding alignment holes on the blade 600, when the flange hole 310 on the flange 300 is coaxially aligned with the connecting hole of the blade 600, the installer can sequentially connect the positioning pin 500 with the positioning pin hole 320 and the alignment hole, so that the flange 300 can be stably fixed on the blade root end face of the blade 600, and the flange 300 and the blade 600 form an integral whole. The positioning pin 500 stably inserted into the positioning pin hole 320 and the alignment hole not only plays a hard limiting role on the flange 300, but also effectively prevents the deformation of the end portion of the blade 600.

[0062] It should be understood that the number of the positioning pin 500, the positioning pin hole 320 and the alignment hole is equal and not limited, and can be one or more, and is preferably four, so that the flange 300 is stably attached to the end face of the blade 600, and the adverse condition of the flange 300 slipping relative to the end face of the blade 600 due to the inner diameter of the flange hole 310 on the flange 300 being larger than the outer diameter of the guide member 200 is avoided, and the accurate centering of the flange hole 310 on the flange 300 and the connecting hole on the blade 600 is further ensured.

[0063] In addition, the alignment hole can also be a threaded hole, and the corresponding positioning pin 500 can be replaced by a screw or a rivet. The inner diameter of the positioning pin hole 320, i.e. the plug-in hole matched with the screw or the rivet, ensures that the outer wall of the screw or the rivet is tightly matched with the positioning pin hole 320, and the flange 300 is stably fixed on the end face of the blade.

[0064] In some embodiments of the blade and variable pitch bearing alignment and connection method of the present application, after the flange 300 is aligned with the blade 600 and the alignment tool is removed, the method further comprises: inserting one end of the blade bolt 700 through the flange hole 310 and into the connecting hole, and extending the other end of the blade bolt 700 away from the end surface of the flange 300; and fitting the guide hole 130 of the trial assembly structure 100 over the blade bolt 700 and abutting the first end surface 110 of the trial assembly structure 100 against the end surface of the flange 300 away from the blade 600, to detect whether the alignment of the blade bolt 700, the flange hole 310, and the connecting hole is offset.

[0065] It should be understood that the above steps serve to verify whether the blade bolt 700, the flange hole 310 of the flange 300, and the connecting hole on the blade 600 are coaxially aligned for subsequent connection of the blade 600 and the variable pitch bearing. If the trial assembly structure 100, the flange 300, and the blade 600 are still misaligned under the connection of the blade bolt 700, the installer can use the corresponding reinforcing structure 400 to adjust the shape of the end of the blade 600. It should be understood that applying the reinforcing structure 400 to the end of the blade 600 and applying force to the reinforcing structure 400 will cause the reinforcing structure 400 to act on the end of the blade 600, causing the end of the blade 600 to expand outwardly or contract inwardly due to the deformation under stress, to ensure that the trial assembly structure 100, the flange 300, and the blade 600 are precisely aligned again under the connection of the blade bolt 700, further ensuring the accuracy of the subsequent connection of the actual variable pitch bearing to the blade 600.

[0066] In some embodiments of the blade and variable pitch bearing alignment and connection method of the present application, referring again to Figure 5 、 Figure 6 and Figure 7 , to prevent the end of the blade 600 from deforming due to its own gravity or external force impact before the blade 600 is connected with the actual variable pitch bearing, the method further comprises providing a reinforcing structure 400 to reinforce the inner wall of the blade 600. Specifically, the reinforcing structure 400 is a support column, which can be a telescopic column with a locking structure to improve the adaptability of the reinforcing structure 400 to different specifications of the blade 600. Before the blade 600 is connected with the actual variable pitch bearing, the installer can pre-attach the support column to the inner wall of the blade 600 by abutting the two ends of the support column against the inner wall of the blade 600 in the radial direction, to provide mechanical support for the blade 600, especially for the end of the blade, to ensure the structural stability of the end of the blade 600, and further ensure the alignment accuracy when the blade 600 is connected with the actual variable pitch bearing.

[0067] In another embodiment, the reinforcing structure 400 comprises a base disc 410 and a plurality of support rods 420 arranged circumferentially on the base disc 410, the support rods 420 are detachably connected with the base disc 410, and the ends of the support rods 420 away from the base disc 410 are used for fixed connection with the blade bolts 700 or fixed connection with the inner wall of the blade 600.

[0068] It needs to be understood that when the ends of the support rods 420 away from the base disc 410 are used for fixed connection with the blade bolts 700, threaded holes are arranged on the ends of the support rods 420 away from the base disc 410, and the threaded holes are used for threaded connection with the blade bolts 700. When the reinforcing structure 400 is installed, the installer can pre-align the shaft center of the base disc 410 with the center of the flange 300 through a forklift or a lifting frame, so that the threaded holes on the support rods 420 are aligned with the blade bolts fixed on the end face of the blade 600, and then the reinforcing structure 400 is rotated linearly along the direction of the blade bolts 700, so that the threaded holes on the support rods 420 are threaded connected with the blade bolts 700, and the reinforcing structure is fixed on the end face of the flange 300. Since the flange 300 and the blade 600 form an integral part at this time, the above cooperation of the blade bolts 700 and the plurality of support rods 420 makes the force intensity at each position of the end of the blade 600 basically consistent, strengthens the overall structural strength of the end of the blade 600, and effectively prevents the structural deformation of the blade 600 in the subsequent transportation process, thereby indirectly improving the accuracy of the subsequent alignment and connection between the blade 600 and the actual variable pitch bearing. It is not difficult to understand that when the blade 600 is aligned and connected with the actual variable pitch bearing, the installer can remove the reinforcing structure 400 as a whole, so as to avoid the influence of the reinforcing structure 400 on the alignment and connection between the variable pitch bearing and the blade.

[0069] In addition, when the ends of the support rods 420 away from the base disc 410 are used for fixed connection with the inner wall of the blade 600, the support rods 420 are hingedly connected with the base disc 410, and the support rods 420 can be understood as jacks hingedly connected with the base disc 410. When the reinforcing structure 400 is installed, the installer can first place the reinforcing structure 400 in the inner cavity of the end of the blade, and then act on the support rods 420 through a lifting frame or other construction device, so that the ends of the support rods 420 away from the base disc 410 abut against the corresponding positions of the inner wall of the blade 600. The support of the plurality of support rods 420 on the inner wall of the blade makes the force on each position of the inner wall of the blade uniform, further prevents the structural deformation of the blade 600 due to its own gravity or external force, further ensures the structural stability of the blade 600, and ensures the accuracy of the subsequent alignment and connection between the blade 600 and the actual variable pitch bearing.

[0070] The above merely illustrates the specific implementation of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the embodiments of the present application, and these modifications or replacements should be covered in the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claims.

Claims

1. A method for aligning and connecting blades and pitch bearings, characterized in that, The application relates to a method for aligning a blade and a flange. The method comprises the following steps: providing an alignment tool for connecting the blade and the flange, wherein the alignment tool comprises a trial structure and a plurality of guide members; the trial structure comprises a first end face and a second end face arranged oppositely and spaced apart, and a plurality of guide holes penetrating through the first end face and the second end face; the plurality of guide holes are distributed along the circumference of the trial structure; the guide member comprises a connecting section and a limiting section; the connecting section is used for connecting with a connecting hole on the blade; the limiting section is used for penetratingly matching with the guide hole; the size of the limiting section is matched with the inner diameter of the guide hole; the guide members are installed at the blade root end face of the blade; the connecting section of the guide member is inserted into the connecting hole on the blade root end face of the blade, and the limiting section of the guide member extends out of the connecting hole; the flange hole of the flange penetrates through the corresponding guide member, and the end face of the flange is attached to the blade root end face of the blade; the guide hole of the trial structure is sleeved on the limiting section of the guide member, and the first end face of the trial structure is attached to the end face of the flange away from the blade, so that the connecting hole, the flange hole and the guide hole are coaxially aligned and positioned; the flange after being positioned with the blade is fixed on the blade root end face of the blade, and the alignment tool is removed; the variable-pitch bearing is connected with the blade through a blade bolt. The trial structure is detachably provided with a plurality of positioning pins, the flange is provided with a plurality of positioning pin holes, and the blade is provided with a plurality of positioning holes. The step of fixing the flange after being positioned with the blade on the blade root end face of the blade comprises the following steps: the positioning pin is sequentially inserted into the positioning pin hole and the positioning hole, so that the flange is fixed on the blade root end face of the blade; and the alignment tool is removed. After the step of fixing the flange after being positioned with the blade on the blade root end face of the blade and removing the alignment tool, the following steps are further included: one end of the blade bolt is inserted into the connecting hole after penetrating through the flange hole, and the other end of the blade bolt extends out of the end face of the flange away from the blade; the guide hole of the trial structure is sleeved on the blade bolt, and the first end face of the trial structure is attached to the end face of the flange away from the blade, so as to detect whether the positioning of the blade bolt, the flange hole and the connecting hole is deviated. The method further comprises providing a reinforcing structure for reinforcing the inner wall of the blade. The reinforcing structure is a support column, and the two ends of the support column can be respectively abutted on the inner wall of the blade in the radial direction.

2. The blade and pitch bearing alignment connection method of claim 1, wherein, The reinforcing structure comprises a base disc and a plurality of support rods arranged on the base disc in the circumferential direction; the support rods are detachably connected with the base disc; one end of the support rod away from the base disc is used for being fixedly connected with the blade bolt or fixedly connected with the inner wall of the blade. ​ ​ 3. The blade and pitch bearing alignment connection method of claim 1, wherein, ​ ​ ​ 4. The blade and pitch bearing alignment connection method of claim 1, wherein, ​ 5. The blade and pitch bearing alignment connection method of claim 4, wherein, ​ 6. The blade and pitch bearing alignment connection method of claim 4, wherein, ​

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