Reinforcing and damping structure for bolt connection part of mountain fan

Abstract

The reinforcing and damping structure for the bolt connecting part of the mountain fan comprises blades and a hub, the hub is provided with assembling holes for the ends of the blades to be inserted, the inner side walls of the assembling holes are fixedly provided with mounting wheel discs, and the mounting wheel discs are provided with a plurality of through connecting holes in the circumferential direction; a plurality of mounting bolts are integrally formed on the end surfaces of the blades and are used for penetrating through the connecting holes in a one-to-one correspondence manner; after the mounting bolt penetrates through the mounting wheel disc, the tail end of the mounting bolt is in threaded connection with a locking nut, the peripheral side of the locking nut is radially diverged to form a limiting rod, and the limiting rod is used for limiting rotation of the locking nut relative to the mounting bolt; buffering unloading layers are arranged between the end faces of the blades and the mounting wheel disc and used for dispersing loads transmitted to the mounting wheel disc by the blades and absorbing vibration energy. The connecting stability of the blades and the hub can be enhanced.

Description

Technical Field

[0001] This invention belongs to the technical field of wind power generation equipment, and specifically relates to a reinforcement and vibration reduction structure for bolted connections of mountain wind turbines. Background Technology

[0002] In wind power generation equipment, the blades, as the core component for energy capture, directly determine the operational safety and lifespan of the unit through their reliable connection with the hub. As wind turbine capacity develops towards larger scales of 6MW and above, blade length has exceeded 80m. The axial tensile force, radial shear force, and circumferential torque that the blade-hub connection must withstand have increased significantly, placing stringent requirements on the load-bearing capacity and fatigue resistance of the connection structure.

[0003] To address the problems of low installation efficiency, uneven preload, and easy loosening due to vibration associated with traditional split bolts, the industry is gradually adopting integrated blade end face bolts. These bolts are formed into a single piece with the metal flange at the blade root through molding, welding, or 3D printing, eliminating the assembly process of split bolts and avoiding the clearance between the bolt and the blade flange.

[0004] However, in practical applications, the failure of one-piece bolts is frequent. The loads that the blades bear during operation include axial centrifugal force and aerodynamic tension, radial flapping force and oscillation force, and circumferential rotational torque. The bolts at the connection between the blade and the hub are under overload for a long time, which accelerates fatigue and makes the nuts easy to loosen or the bolts to break. Summary of the Invention

[0005] This invention provides a reinforcement and shock absorption structure for the bolt connection of a mountain wind turbine to solve the problem of easy failure of the connecting bolts at the connection between the blade and the hub.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A reinforced and shock-absorbing structure for bolted connections of a mountain wind turbine includes blades and a hub. The hub has an assembly hole for inserting the blade tip. An mounting disc is fixed to the inner wall of the assembly hole. The mounting disc has several through connection holes along its circumference. The blade has a number of mounting bolts integrally formed on its end face, and the mounting bolts are used to pass through the multiple connection holes one by one. After the mounting bolt passes through the mounting wheel, its end is threaded with a locking nut. A limit rod is formed radially radiating from the periphery of the locking nut. A stop rod is also provided on the surface of the mounting wheel. The stop rod abuts against the limit rod to restrict the rotation of the locking nut relative to the mounting bolt. A buffer and stress-relief layer is provided between the end face of the blade and the mounting disk. The buffer and stress-relief layer is used to disperse the load transmitted from the blade to the mounting disk and absorb vibration energy.

[0007] Furthermore, the mounting bolt includes a hub section, a transition section, and a blade root section arranged coaxially in sequence, and the blade root section is integrally connected to the end face of the blade; The cross-sectional sidewall of the transition section has multiple limiting ridges spaced circumferentially. The inner sidewall of the connecting hole is provided with multiple limiting grooves corresponding to the limiting edge. The sidewall of the limiting groove is attached with an elastic layer. The transition section is inserted into the connecting hole and the limiting edge is embedded in the limiting groove and abuts against the elastic layer.

[0008] Furthermore, the mounting wheel disc protrudes towards the inner side wall of the hub to form a protruding disc, and the locking nut and the limiting rod, after being tightened, abut against the surface of the protruding disc; The protruding disc has a sliding groove extending inward from the inner sidewall, and the sliding groove is used to insert the stop bar (34).

[0009] Furthermore, several fiber steel bundles are embedded axially inside the blade, with one end of each fiber steel bundle extending to the outer side of the blade's end face. The mounting bolt has a through hole along the axial direction inside, and at least one of the fiber steel bundles is inserted through the through hole.

[0010] Furthermore, the inner wall of the end of the perforation facing the inner side of the hub is sequentially formed with a cylindrical enlarged hole and a conical transition hole. A tensioning anchor is provided in the conical transition hole, and a limit seal is connected to the internal thread of the cylindrical enlarged hole. The tensioning anchor includes a first half and a second half, with the fiber steel bundle clamped and confined between the first half and the second half.

[0011] Furthermore, an anchor plate is fixed inside the blade, and the end of the fiber steel bundle away from the mounting bolt is fixedly connected to the anchor plate; The anchor plate is integrally formed with the main beam structure of the blade, and the fiber steel bundles are fixed to the anchor plate by hot melt adhesive and the outer periphery is formed by mechanical extrusion to form an anti-detachment structure.

[0012] Furthermore, the buffer unloading layer includes a buffer flange for absorbing bending moment force and a force-dispersing flange for dispersing instantaneous impact force. The buffer flange and the force-dispersing flange are designed to fit together and are both sleeved outside the mounting bolts. The buffer flange is sandwiched between the force-dispersing flange and the blade end face, and the force-dispersing flange is sandwiched between the mounting wheel and the buffer flange.

[0013] Furthermore, the stress-dissipating flange has multiple main ribs on one side facing the buffer flange. The main ribs extend radially and circumferentially along the stress-dissipating flange, and each main rib has multiple branch ribs that radiate outwards in a tree-like pattern around its periphery. The surface of the buffer flange is recessed inward to form a receiving groove. The shape of the receiving groove matches the shape of the main rib and the sub-rib. When the buffer stress relief layer is installed, the main rib and the sub-rib are inserted into the receiving groove.

[0014] Furthermore, the buffer flange is made of CFRP carbon fiber composite material and is bonded to the blade end face with epoxy adhesive; the force-dispersing flange is made of titanium alloy and the force-dispersing flange and the mounting wheel are fixed by multiple countersunk screws.

[0015] Furthermore, the elastic layer is made of polyurethane elastomer, the thickness of the elastic layer is 0.8-1.2mm, and the elastic layer is fixed to the side wall of the limiting groove by pressure-sensitive adhesive; The fiber steel bundles are CFRP carbon fiber reinforcing bars, and both ends of the perforation are chamfered. An epoxy adhesive layer is filled between the fiber steel bundles and the inner wall of the perforation.

[0016] The present invention can achieve the following beneficial effects: 1. This invention, by setting a limiting rod in the circumference of the locking nut, can restrict the rotation of the locking nut relative to the mounting bolt, thereby initially preventing the locking nut from loosening due to vibration; by setting a buffer and stress-relief layer between the blade and the mounting disc, the axial tensile force and circumferential torque transmitted by the blade can be distributed to the entire area of ​​the mounting disc, avoiding the load from being concentrated around the mounting bolt, and at the same time absorbing the vibration energy caused by mountain turbulence, reducing the stress fluctuation amplitude of the mounting bolt and reducing fatigue damage to the mounting bolt caused by long-term overload.

[0017] 2. Fiber steel bundles are embedded inside the blade, and the fiber steel bundles are fitted with the through holes of the mounting bolts; one end of the fiber steel bundle is fixed to the blade main beam through the anchor plate, and the other end is limited by the tension anchor. In this way, the fiber steel bundles share the axial tensile force borne by the mounting bolts, avoiding the mounting bolts bearing the centrifugal force and aerodynamic tension of the blade alone. This reduces the occurrence of failure and breakage at the connection between the mounting bolts and the blade end face.

[0018] 3. The buffer and stress relief layer includes a fitted structure of buffer flange and stress-dissipating flange. First, the buffer flange is made of CFRP carbon fiber composite material, which makes the buffer flange have good bending resistance and can absorb the bending moment force transmitted by the blade. The surface of the stress-dissipating flange is provided with main ribs and branch ribs, which can disperse the instantaneous impact force borne by the blade and hub connection to the entire surface of the mounting disc, avoid the load being concentrated around the mounting bolts, and reduce the occurrence of mounting bolt breakage caused by stress concentration. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of the mountain wind turbine of the present invention after installation; Figure 2 This is an exploded view of the connection between the blade and the hub of the present invention. Figure 3 This is a partial structural diagram of the mounting wheel and mounting bolts of the present invention during aligned installation; Figure 4 This is a partial structural diagram of the present invention after the mounting wheel and mounting bolts are installed; Figure 5 This is a cross-sectional view of the connection between the blade and the hub of the buffer stress relief layer, as shown in this invention. Figure 6 This is a front view of the force-dispersing flange of the present invention; Figure 7 This is a cross-sectional view of the fiber steel bundles and the connection of the mounting bolts used in this invention.

[0020] The attached diagram lists the components represented by each number as follows: 1. Blade; 2. Hub; 21. Assembly hole; 3. Mounting disc; 31. Connecting hole; 32. Limiting groove; 33. Protruding disc; 331. Sliding groove; 34. Stop bar; 4. Mounting bolt; 41. Hub section; 42. Transition section; 421. Limiting ridge; 43. Blade root section; 44. Perforation; 45. Cylindrical enlarged hole; 46. Conical transition hole; 5. Locking nut; 51. Limiting rod; 6. Buffer and stress relief layer; 61. Buffer flange; 62. Stress-dispersing flange; 621. Main rib; 622. Sub-rib; 7. Fiber steel bundle; 8. Tensioning anchor; 81. First half; 82. Second half; 9. Limiting seal. Detailed Implementation

[0021] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0022] like Figure 1 and Figure 2As shown, the reinforcement and vibration reduction structure of the bolt connection part of the mountain wind turbine includes blades 1 and hub 2. Hub 2 serves as the main load-bearing body that docks with blades 1. Its side wall has an assembly hole 21 for inserting the end of blade 1. The inner side wall of the assembly hole 21 is welded and fixed with a mounting disc 3. The mounting disc 3 is a ring-shaped component and has several through connection holes 31 evenly opened along the circumference. The number of connection holes 31 is set according to the size of blade 1 and load-bearing requirements. The diameter of the connection hole 31 is adapted to the outer diameter of the subsequent mounting bolt 4 to ensure that the mounting bolt 4 can pass through stably.

[0023] Reference Figure 3 and Figure 4 The blade 1, as an energy harvesting component, has several mounting bolts 4 machined on its end face facing the hub 2 using a molding process. The number of mounting bolts 4 corresponds one-to-one with the number of connecting holes 31, and the mounting bolts 4 are evenly distributed circumferentially along the end face of the blade 1 to ensure uniform load transfer. Each mounting bolt 4 includes a hub section 41, a transition section 42, and a blade root section 43 arranged coaxially in sequence, wherein the blade root section 43 is integrally connected to the end face of the blade 1. The cross-sectional sidewall of the transition section 42 has multiple limiting ridges 421 spaced circumferentially. Each limiting ridge 421 is a strip-shaped protrusion extending along the length of the transition section 42. At the same time, the inner sidewall of the connecting hole 31 has the same number of limiting grooves 32 at the positions corresponding to the limiting ridges 421. The sidewall of the limiting groove 32 is bonded with an elastic layer by pressure-sensitive adhesive. The elastic layer is made of polyurethane elastomer and its thickness is controlled between 0.8-1.2 mm. This thickness can ensure that the elastic layer has sufficient deformation to absorb radial loads and can also prevent the transition section 42 from loosening when it is too thick.

[0024] When the blade 1 is connected to the hub 2, the transition section 42 of the mounting bolt 4 is inserted into the connecting hole 31, and the limiting rib 421 on the transition section 42 is embedded in the limiting groove 32 of the connecting hole 31. The limiting rib 421 is in close contact with the elastic layer, thereby limiting the circumferential rotation of the mounting bolt 4 and buffering the radial load.

[0025] After the mounting bolt 4 passes through the connecting hole 31, its end is machined with external threads on its outer periphery, and a locking nut 5 is connected to the threaded end. Multiple limiting rods 51 are evenly distributed radially around the locking nut 5, and the limiting rods 51 and the locking nut 5 are integral forged structures.

[0026] The mounting disc 3 protrudes integrally from the inner sidewall of the hub 2 to form a protruding disc 33. When the locking nut 5 is tightened to the designed preload, the locking nut 5 and the surface of the protruding disc 33 are tightly pressed together. Several sliding grooves 331 are circumferentially formed inside the protruding disc 33. Each sliding groove 331 is a shaped limiting groove extending inward from the inner sidewall of the protruding disc 33. A stop rod 34 is inserted into the sliding groove 331. After the stop rod 34 is inserted into the sliding groove 331, its sidewall abuts against the sidewall of the limiting rod 51, thereby limiting the rotation of the limiting rod 51 and preventing the locking nut 5 from loosening relative to the mounting bolt 4. Only one stop rod 34 is shown in the attached drawing. In this embodiment, two limiting rods 51 are formed on the sidewall of each locking nut 5. A sliding groove 331 is provided between every two connecting holes 31. The sliding groove 331 has a larger diameter near the mounting wheel 3 and a smaller diameter near the surface of the protruding disc 33, thereby restricting the stop rod 34 from disengaging from the sliding groove 331. The portion of the stop rod 34 extending beyond the surface of the protruding disc 33 can simultaneously abut against the limiting rods 51 on both sides. Since each locking nut 5 has a stop rod 34 on both sides, the clockwise and counterclockwise rotation of the limiting rods 51 can be restricted simultaneously. In addition, an internal thread is provided at the end of the sliding groove 331. After the stop rod 34 is inserted into the sliding groove 331, a bolt is screwed into the end of the sliding groove 331 until the end face of the bolt abuts against the sidewall of the stop rod 34, thereby limiting the stop rod 34.

[0027] To achieve load distribution and vibration absorption between the blade 1 and the mounting disk 3, a buffer stress-relief layer 6 is provided between the end face of the blade 1 and the mounting disk 3. The buffer stress-relief layer 6 includes a buffer flange 61 and a stress-dispersing flange 62, both of which are annular structures with a close fit design and are fitted onto the outside of the mounting bolts 4. The buffer flange 61 is sandwiched between the stress-dispersing flange 62 and the end face of the blade 1 and is made of CFRP carbon fiber composite material. This material has excellent bending resistance and can effectively absorb the bending moment force transmitted by the blade 1. During manufacturing, the buffer flange 61 is bonded to the end face of the blade 1 with epoxy adhesive. The shear strength of the epoxy adhesive is ≥30MPa to ensure the reliability of the connection between the buffer flange 61 and the end face of the blade 1.

[0028] Reference Figure 5 and Figure 6The stress-dissipating flange 62 is sandwiched between the mounting wheel 3 and the buffer flange 61. It is made of titanium alloy, which has both high strength and corrosion resistance, and can adapt to the harsh environment of high humidity and salt spray in mountainous areas. The stress-dissipating flange 62 extends radially and circumferentially on the side facing the buffer flange 61 to form multiple main ribs 621. The periphery of each main rib 621 radiates outward in a tree-like manner to form multiple branch ribs 622. Correspondingly, the surface of the buffer flange 61 facing the stress-dissipating flange 62 is recessed inward to form a receiving groove. The shape of the receiving groove is completely matched with the shape of the main ribs 621 and the branch ribs 622. When the blade 1 is installed on the hub 2, the main rib 621 and the branch rib 622 of the force-dispersing flange 62 can be inserted into the receiving groove of the buffer flange 61 one by one to achieve precise fit between the two and ensure uniform load transfer from the buffer flange 61 to the force-dispersing flange 62. In addition, during manufacturing, the force-dispersing flange 62 is fixed to the mounting disc 3. Specifically, the force-dispersing flange 62 and the mounting disc 3 are fixed by multiple countersunk screws, and the countersunk screws are completely sunk into the surface of the force-dispersing flange 62 to avoid protrusion affecting the fit with the buffer flange 61.

[0029] By fitting the buffer flange 61 and the end face of the blade 1 together, the buffer flange 61 can first absorb the vibration energy caused by the mountain turbulence, thereby reducing the stress fluctuation amplitude of the mounting bolt 4 and absorbing and reducing fatigue damage to the mounting bolt 4 caused by long-term overload. Then, the force-dispersing flange 62 is set between the buffer flange 61 and the mounting wheel 3. Through the main rib 621 and the branch rib 622 on the force-dispersing flange 62, the axial tensile force and circumferential torque transmitted by the blade 1 can be dispersed to the entire area of ​​the mounting wheel 3, avoiding the load from being concentrated around the mounting bolt 4 and affecting the structural stability of the mounting bolt 4.

[0030] Reference Figure 7 Several fiber steel bundles 7 are embedded axially inside the blade 1. The fiber steel bundles 7 are made of CFRP carbon fiber reinforced steel. Each mounting bolt 4 is equipped with one or more fiber steel bundles 7. One end of the fiber steel bundle 7 extends to the outer side of the end face of the blade 1, and the other end extends into the interior of the blade 1. Correspondingly, a through hole 44 is formed axially inside the mounting bolt 4. The diameter of the through hole 44 differs from the diameter of the fiber steel bundle 7 by 0.1-0.2 mm, and it is clearance-fitted with the fiber steel bundle 7. The end of the through hole 44 is chamfered to avoid friction between the fiber steel bundle 7 and the sharp end faces of the through hole 44, which would affect the structural strength of the fiber steel bundle 7.

[0031] The end of the fiber steel bundle 7 away from the end face of the blade 1 is anchored to the main beam structure inside the blade 1. Specifically, an anchor plate is integrally formed on the main beam structure of the blade 1. The fiber steel bundle 7 is fixed to the anchor plate with hot melt adhesive, and the outer periphery of the fiber steel bundle 7 is mechanically squeezed by special tooling to form an anti-detachment structure, ensuring the connection strength between the fiber steel bundle 7 and the anchor plate.

[0032] Meanwhile, on the inner wall of the end of the perforation 44 facing the inner side of the hub 2, a cylindrical enlarged hole 45 and a conical transition hole 46 are formed in sequence. A tensioning anchor 8 with a matching shape is provided in the conical transition hole 46. The tensioning anchor 8 includes a first half 81 and a second half 82, and the inner sides of the first half 81 and the second half 82 are machined with arc-shaped grooves adapted to the fiber steel bundle 7. The fiber steel bundle 7 is clamped and confined between the first half 81 and the second half 82. A limit seal 9 is also threadedly connected in the cylindrical enlarged hole 45. After the limit seal 9 is tightened, it abuts against the tensioning anchor 8 to ensure that the fiber steel bundle 7 is in a taut state and does not loosen. At the same time, it seals the perforation 44 to prevent rainwater and dust from entering the perforation 44 and corroding the fiber steel bundle 7. In addition, an epoxy adhesive layer is filled between the fiber steel bundle 7 and the inner wall of the perforation 44 to improve the synergistic force transmission effect between the fiber steel bundle 7 and the mounting bolt 4.

[0033] By incorporating fiber steel bundles 7, the problem of long-term stress on the mounting bolts 4, leading to breakage and failure at the connection between the mounting bolts 4 and the blade 1, can be alleviated. One end of the fiber steel bundle 7 is embedded in the blade 1 and fixed by an anchor plate, while the other end is limited and tensioned by a tensioning anchor 8, ensuring that the fiber steel bundle 7 remains taut and is not prone to loosening. It should be noted that the fiber steel bundle 7 is pre-embedded and installed during the manufacturing process of the blade 1, and the tensioning anchor 8 and the limiting seal 9 are already installed. During on-site assembly, the blade 1 only needs to be directly aligned and installed with the hub 2.

[0034] The reinforcement and vibration reduction structure of the bolt connection part of the mountain wind turbine in this application is adapted to the complex working conditions of mountain wind power. Through the synergistic effect of each component, it can not only achieve a stable connection between the blade 1 and the hub 2, but also effectively distribute the load, absorb vibration, reduce the failure risk of the mounting bolt 4, and at the same time have excellent weather resistance to ensure the long-term stable operation of the mountain wind turbine. The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A reinforced and vibration-damping structure for bolted connections of a mountain wind turbine, characterized in that: It includes a blade (1) and a hub (2). The hub (2) has an assembly hole (21) for inserting the end of the blade (1). The inner wall of the assembly hole (21) is fixed with a mounting disc (3). The mounting disc (3) has several through connecting holes (31) in the circumferential direction. The blade (1) has a number of mounting bolts (4) integrally formed on its end face, and the mounting bolts (4) are used to pass through the multiple connecting holes (31) one by one. After the mounting bolt (4) passes through the mounting wheel (3), its end is threaded with a locking nut (5). The circumference of the locking nut (5) is radially diverging to form a limiting rod (51). The surface of the mounting wheel is also provided with a stop rod (34). The stop rod (34) abuts against the limiting rod (51) to restrict the locking nut (5) from rotating relative to the mounting bolt (4). A buffer unloading layer (6) is provided between the end face of the blade (1) and the mounting disk (3). The buffer unloading layer (6) is used to disperse the load transmitted from the blade (1) to the mounting disk (3) and absorb vibration energy.

2. The reinforcement and vibration damping structure for bolted connections of mountain wind turbines according to claim 1, characterized in that: The mounting bolt (4) includes a hub section (41), a transition section (42) and a blade root section (43) arranged coaxially in sequence, and the blade root section (43) is integrally connected to the end face of the blade (1); The cross-sectional sidewall of the transition section (42) is formed with multiple limiting ridges (421) spaced circumferentially. The inner sidewall of the connecting hole (31) is provided with a plurality of limiting grooves (32) corresponding to the limiting edge (421). The sidewall of the limiting groove (32) is attached with an elastic layer. The transition section (42) is inserted into the connecting hole (31) and the limiting edge (421) is embedded in the limiting groove (32) and abuts against the elastic layer.

3. The reinforcement and vibration damping structure for bolted connections of mountain wind turbines according to claim 1, characterized in that: The mounting wheel (3) protrudes towards the inner side wall of the hub (2) to form a protruding disc (33). After the locking nut (5) and the limiting rod (51) are tightened, they abut against the surface of the protruding disc (33). The protruding disc (33) has a sliding groove (331) extending inward from the inner sidewall, and the sliding groove (331) is used to insert the stop bar (34).

4. The reinforcement and vibration damping structure for bolted connections of mountain wind turbines according to claim 2, characterized in that: Several fiber steel bundles (7) are embedded axially inside the blade (1), and one end of the fiber steel bundles (7) extends to the outer side of the end face of the blade (1). The mounting bolt (4) has a through hole (44) axially inside, and at least one of the fiber steel bundles (7) is inserted into the through hole (44).

5. The reinforcement and vibration damping structure for bolted connections of mountain wind turbines according to claim 4, characterized in that: The inner wall of the end of the perforation (44) facing the inner side of the hub (2) is formed with a cylindrical enlarged hole (45) and a conical transition hole (46) in sequence. A tensioning anchor (8) is provided in the conical transition hole (46), and a limit seal (9) is threaded in the cylindrical enlarged hole (45). The tensioning anchor (8) includes a first half (81) and a second half (82), with the fiber steel bundle clamped and confined between the first half (81) and the second half (82).

6. The reinforcement and vibration damping structure for bolted connections of mountain wind turbines according to claim 4, characterized in that: An anchor plate is fixed inside the blade (1), and the end of the fiber steel bundle (7) away from the mounting bolt (4) is fixedly connected to the anchor plate; The anchor plate is integrally formed with the main beam structure of the blade (1), and the fiber steel bundle (7) is fixed to the anchor plate by hot melt adhesive and the outer periphery is formed by mechanical extrusion to form an anti-detachment structure.

7. The reinforcement and vibration damping structure for bolted connections of mountain wind turbines according to claim 1, characterized in that: The buffer unloading layer (6) includes a buffer flange (61) for absorbing bending moment force and a force-dispersing flange (62) for dispersing instantaneous impact force. The buffer flange (61) and the force-dispersing flange (62) are designed to fit together and are both sleeved outside the mounting bolt (4). The buffer flange (61) is sandwiched between the force-dispersing flange (62) and the end face of the blade (1). The force-dispersing flange (62) is sandwiched between the mounting wheel (3) and the buffer flange (61).

8. The reinforcement and vibration damping structure for bolted connections of mountain wind turbines according to claim 7, characterized in that: The stress-dissipating flange (62) has multiple main ribs (621) on the side facing the buffer flange (61). The main ribs (621) extend radially and circumferentially along the stress-dissipating flange (62). Each main rib (621) has multiple branch ribs (622) radiating outwards in a tree-like pattern around its periphery. The surface of the buffer flange (61) is recessed inward to form a receiving groove. The shape of the receiving groove matches the shape of the main rib (621) and the sub-rib (622). When the buffer unloading layer (6) is installed, the main rib (621) and the sub-rib (622) are inserted into the receiving groove.

9. The reinforcement and vibration damping structure for bolted connections of mountain wind turbines according to claim 8, characterized in that: The buffer flange (61) is made of CFRP carbon fiber composite material, and the buffer flange (61) is bonded to the end face of the blade (1) with epoxy adhesive; The force-dispersing flange (62) is made of titanium alloy, and the force-dispersing flange (62) and the mounting wheel (3) are fixed by a plurality of countersunk screws.

10. The reinforcement and vibration damping structure for the bolt connection of the mountain wind turbine according to claim 4, characterized in that: The elastic layer is made of polyurethane elastomer, and the thickness of the elastic layer is 0.8-1.2mm. The elastic layer is fixed to the side wall of the limiting groove (32) by pressure-sensitive adhesive. The fiber steel bundle (7) is a CFRP carbon fiber steel bar, and both ends of the perforation (44) are chamfered. An epoxy adhesive layer is filled between the fiber steel bundle (7) and the inner wall of the perforation (44).

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