A kind of crack reinforcement device and reinforcement method of variable pitch bearing

Abstract

This application relates to the field of wind turbine generators, and more particularly to a device and method for reinforcing a cracked pitch bearing. The device includes two reinforcing seats, each with an arc-shaped positioning part and a straight-face positioning part. The two reinforcing seats are respectively installed at both ends of the pitch bearing crack. The arc-shaped positioning part is fitted against the outer circumferential surface of the pitch bearing, and the straight-face positioning part is fitted against the end face of the pitch bearing. The two reinforcing seats are clamped together by a first fastening assembly, and each straight-face positioning part is fastened to the end face of the pitch bearing by a second fastening assembly. The method includes obtaining the initial width of the crack, acquiring the initial distance between the two reinforcing seats, acquiring the current distance between the two reinforcing seats, establishing the relationship between the current distance, the initial distance, and the initial width, and triggering an alarm based on a threshold. This application achieves crack reduction in the pitch bearing, prevents crack deterioration, strengthens the local connection strength of the pitch bearing, extends the service life of the pitch bearing, simplifies the installation structure, and reduces installation and maintenance costs.

Description

Technical Field

[0001] This application relates to wind turbine generators, and more particularly to a reinforcement device and method for cracking pitch bearings. Background Technology

[0002] In the wind power industry, pitch bearings are frequently cracked due to their complex operating conditions and long-term exposure to various combined loads. This is a persistent and extremely challenging problem for the industry. How to handle cracked pitch bearings is crucial; if not addressed promptly, they can cause wind turbine malfunctions and result in significant economic losses. Replacing all three pitch bearings requires removing the entire hub, leading to substantial costs.

[0003] Currently, cracking failure of pitch bearings is quite common in the industry. The common technology used in the industry is to add a ring-shaped support flange to the end face of the pitch bearing. The support flange is a full circle. The main disadvantages of this solution are as follows:

[0004] (1) Adding a support flange to the end face can strengthen the connection strength of the pitch bearing, but it has limited effect on preventing the pitch bearing from cracking and preventing the pitch bearing from cracking and propagating. There is only support on the end face of the pitch bearing, and no reinforcement support is provided on the outer diameter surface. Pitch bearing cracks often start from the ball hole on the outer diameter surface and extend to the end face, making it difficult to prevent the crack from worsening and reducing the service life of the pitch bearing.

[0005] (2) The existing treatment after cracking is to remove the tower and return it to the factory for repair. All three pitch bearings need to be replaced, which requires expensive hoisting and transportation costs, resulting in huge economic losses. Moreover, replacing the original pitch bearings does not improve reliability and may cause secondary cracking, resulting in huge economic losses.

[0006] In addition, current methods for monitoring pitch bearing cracks include acoustic emission sensors, video monitoring, conductive paint, and closed-circuit monitoring using internal and external power lines. Each method has limitations: video monitoring is easily obscured by oil stains and cannot monitor pitch bearings that have already cracked and have been reinforced with a reinforcing ring; conductive paint cannot detect crack propagation in cracked pitch bearings; the method of using internal and external taut wires relies on the wires breaking after cracking, thus creating a circuit break, but this method may also lead to wire breakage under load and deformation, resulting in false readings; acoustic emission sensors are easily affected by stress release from other components in the hub during operation, as well as noise and friction wear from other components in the wind turbine, leading to inaccurate results. Summary of the Invention

[0007] To address the problems of reduced strength, shortened service life, and high maintenance costs after existing pitch bearings crack, this application provides a pitch bearing crack reinforcement device and reinforcement method.

[0008] Firstly, the pitch bearing crack reinforcement device provided in this application adopts the following technical solution:

[0009] A pitch bearing crack reinforcement device includes two reinforcement seats. Each reinforcement seat has an arc-shaped positioning part and a straight-shaped positioning part, which are arranged in an L-shape. The two reinforcement seats are respectively installed at both ends of the pitch bearing crack. The arc-shaped positioning part is in contact with the outer circumferential surface of the pitch bearing, and the straight-shaped positioning part is in contact with the end face of the pitch bearing. The straight-shaped positioning parts of the two reinforcement seats are located on the same side of the end face of the pitch bearing. The two reinforcement seats are clamped together by a first fastening assembly, and each straight-shaped positioning part is fastened to the end face of the pitch bearing by a second fastening assembly.

[0010] By adopting the above technical solution, the reinforcement device is mainly used to strengthen the pitch bearing that has already cracked. The straight positioning part supports the end face of the pitch bearing, and the arc positioning part supports the outer circumference of the pitch bearing. Since the reinforcement seat is fixed to the end face of the pitch bearing through the straight positioning part, the two reinforcement seats are clamped by the tightening of the first fastening component, which drives the end face of the pitch bearing to tighten at the crack, thereby realizing the local reinforcement of the cracked pitch bearing and the closing of the crack, preventing the crack from deteriorating further, and extending the service life of the pitch bearing. Compared with the whole ring reinforcement ring, the local reinforcement seat is smaller, lighter, and easier to install.

[0011] As a further improvement to the above technical solution, the two reinforcing seats have notches on their opposite surfaces, and the two notches are combined to form a crack observation window for observing the crack.

[0012] By adopting the above technical solution, the crack observation window can intuitively obtain the state of the crack, thus facilitating the treatment of the crack.

[0013] As a further improvement to the above technical solution, the first fastening assembly includes a double-ended tie bolt, the reinforcing base is provided with tie bolt holes, the tie bolt passes through the tie bolt holes of the two reinforcing bases, and both ends of the double-ended tie bolt are locked by tie nuts.

[0014] By adopting the above technical solution, the double-ended tie bolt has high locking strength, stable structure, and simple processing of the reinforcing base.

[0015] As a further improvement to the above technical solution, the second fastening assembly includes a fastening bolt, the pitch bearing end face is provided with a fastening hole, the straight positioning part is provided with a hexagonal anti-loosening hole, the tail end of the fastening bolt passes through the fastening hole and is located in the hexagonal anti-loosening hole, and the anti-loosening nut for locking the fastening bolt is located in the hexagonal anti-loosening hole.

[0016] By adopting the above technical solution, the combination of the fastening bolt and the hexagonal anti-loosening hole effectively prevents loosening and improves the overall stability of the fastening.

[0017] As a further improvement to the above technical solution, one of the reinforcement bases is provided with a sensor mounting hole, and a displacement sensor for detecting the distance between the two reinforcement bases is provided in the sensor mounting hole.

[0018] By adopting the above technical solution, the distance between the two reinforcement seats can be monitored by the displacement sensor, which can reflect the crack propagation and realize crack monitoring.

[0019] Secondly, another pitch bearing crack reinforcement device provided in this application adopts the following technical solution:

[0020] A pitch bearing crack reinforcement device includes two reinforcement seats. Each reinforcement seat has an arc-shaped positioning part and a straight-shaped positioning part, which are arranged in an L-shape. The two reinforcement seats are respectively installed at both ends of the pitch bearing crack. The arc-shaped positioning part is in contact with the outer circumferential surface of the pitch bearing, and the straight-shaped positioning part is in contact with the end face of the pitch bearing. The straight-shaped positioning parts of the two reinforcement seats are located on the same side of the end face of the pitch bearing. The two reinforcement seats are clamped together by a first fastening assembly, and each straight-shaped positioning part is fastened to the end face of the pitch bearing by a second fastening assembly. One of the reinforcement seats has a sensor mounting hole. Two sensor mounting holes are provided, and a first displacement sensor and a second displacement sensor are respectively installed in the two sensor mounting holes. The first displacement sensor and the second displacement sensor are arranged sequentially in the thickness direction of the pitch bearing.

[0021] By using two displacement sensors, the accuracy of detecting the distance between the two reinforcement seats can be improved, thereby determining whether the first fastening component is loose (loosening will increase the crack). On the other hand, the two displacement sensors can also monitor the offset of the two reinforcement seats relative to the pitch bearing end face, thereby determining whether the second fastening component is loose.

[0022] This application provides a method for reinforcing a pitch bearing crack as described above, comprising the following steps:

[0023] S1. Install the reinforcement device at the crack where the pitch bearing displacement occurs. Before or during the installation process, measure the initial width of the crack as A.

[0024] S2. Clamp the two reinforcing seats to close the crack. Use the first displacement sensor and the second displacement sensor to measure the initial distance between the two reinforcing seats as B.

[0025] S3. After running for a period of time, the first displacement sensor and the second displacement sensor measured the current distances between the two reinforcement seats as C1 and C2, respectively.

[0026] S4. An alarm will sound when C1-B≥A or C2-B≥A, indicating that the first fastening component may be loose and the two fastening seats have moved away from each other. In this case, the two fastening seats should be re-clamped by adjusting the first fastening component.

[0027] An alarm will sound when C1-B≠C2-B, indicating that the second fastening assembly may be loose and the reinforcement seat may be misaligned relative to the pitch bearing end face. In this case, the reinforcement seat should be fastened to the pitch bearing end face by adjusting the second fastening assembly.

[0028] As a further improvement to the above technical solution, notches are provided on the opposite surfaces of the two reinforcing seats. After the two notches are merged, a crack observation window is formed for observing the crack. In step S4, before adjusting the first fastening component, the state of the crack and whether there is an opening between the mating surfaces of the two reinforcing seats are observed through the crack observation window. The adjustment of the first fastening component is determined based on the observation results. At the same time, it is also necessary to observe the offset and skew of the two reinforcing seats and the difference in the size of the opening between the mating surfaces of the two reinforcing seats. The second fastening component needs to be adjusted based on the observation results.

[0029] Before adjusting the second fastening component, observe the offset and skew of the two reinforcing seats and the difference in the size of the opening between the mating surfaces of the two reinforcing seats. Based on the observation results, determine whether to adjust the second fastening component. At the same time, it is also necessary to observe the crack condition and whether there is an opening between the mating surfaces of the two reinforcing seats. Based on the observation results, determine whether it is necessary to adjust the first fastening component.

[0030] By adopting the above technical solution, two displacement sensors are used to monitor the cracked pitch bearing. These sensors have high accuracy and are not affected by the environment. They monitor the operating status after the original crack has closed, and can detect the development of cracks in a timely manner. The setting of the crack observation window further improves the crack monitoring, avoids monitoring errors, enables timely maintenance, and ensures the stable operation of the wind turbine.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. A pair of reinforcing seats are used to support the end face and outer diameter of the pitch bearing. By tightening the first fastening component, the two arc-shaped blocks are clamped together, which realizes the closing of the crack in the pitch bearing, prevents the crack from deteriorating further, strengthens the local connection strength of the pitch bearing, and extends the service life of the pitch bearing.

[0033] 2. Compared to a full-circle reinforcing ring, the reinforcing base structure is smaller and lighter, making it easier to install and reducing costs.

[0034] 3. The installation process is simple and easy to operate. The installation can be carried out in the air using a suspended platform, without having to lift the hub down. Compared with the current solution of lifting the hub down to replace the pitch bearing, it saves huge manpower and material costs, generates huge economic benefits, and is of great significance to the entire wind power industry.

[0035] 4. Compared with existing pitch bearing crack monitoring devices, which are more focused on monitoring the development of cracks from scratch, this application is mainly for monitoring pitch bearings that have already cracked. The displacement sensor used has high accuracy and is not affected by the environment. It monitors the operating status after the original crack has closed, and can detect the development of cracks in a timely manner. The setting of the crack observation window further improves crack monitoring, enabling timely maintenance and ensuring the stable operation of the wind turbine. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the pitch bearing crack reinforcement device of Embodiment 1 of this application.

[0037] Figure 2 This is a schematic diagram of the back structure of the reinforcing base in Embodiment 1 of this application.

[0038] Figure 3 This is a front structural diagram of the reinforcing base in Embodiment 1 of this application.

[0039] Figure 4 This is a schematic diagram of the back structure of the reinforcing base in Embodiment 2 of this application.

[0040] Figure 5 This is a front structural diagram of the reinforcing base in Embodiment 2 of this application.

[0041] Figure 6 This is a schematic diagram of the structure in Embodiment 2 of this application where the first and second displacement sensors are installed on the reinforcing base.

[0042] Figure 7 This is a cross-sectional schematic diagram of the reinforcing base in Embodiment 2 of this application.

[0043] Figure 8 This is a simplified flowchart illustrating the method for reinforcing a cracked pitch bearing according to Embodiment 3 of this application.

[0044] Explanation of reference numerals in the attached drawings: 1. Pitch bearing; 2. Reinforcing base; 201. Reinforcing block; 202. Side plate; 21. Recess; 22. Sensor mounting hole; 3. Arc-shaped positioning part; 4. Straight-faced positioning part; 41. Hexagonal anti-loosening hole; 5. First fastening assembly; 51. Tie bolt; 52. Tie nut; 6. Second fastening assembly; 61. Fastening bolt; 62. Anti-loosening nut; 7. Crack observation window; 81. First displacement sensor; 82. Second displacement sensor; 83. Cable. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0046] The directional terms such as "up," "down," "left," "right," "front," and "back" used in this application only represent relative positions in the diagram and are used for the convenience of describing this application. They do not represent the absolute position of the product and should not be regarded as limitations on this application.

[0047] Example 1

[0048] This application discloses a device for reinforcing cracked pitch bearings.

[0049] like Figure 1 and Figure 2 As shown, the pitch bearing crack reinforcement device of this embodiment includes two reinforcement seats 2, which have the same structure. The reinforcement seat 2 is provided with an arc-shaped positioning part 3 and a straight-shaped positioning part 4, which are arranged in an L-shape. In use, the two reinforcement seats 2 are placed on the two ends of the pitch bearing 1 with cracks, and they are installed on the pitch bearing 1 with mutual abutment. The arc-shaped positioning part 3 of each reinforcement seat 2 is in contact with the outer circumferential surface of the pitch bearing 1, and the straight-shaped positioning part 4 is in contact with the end face of the pitch bearing 1. The straight-shaped positioning parts 4 of the two reinforcement seats 2 are located on the same side of the end face of the pitch bearing 1, that is, the two reinforcement seats 2 are symmetrically arranged relative to the cracks. Each straight-face positioning part 4 is fastened to the end face of the pitch bearing 1 by the second fastening component 6. The two reinforcement seats 2 are clamped together by the first fastening component 5. Since the straight-face positioning part 4 of the reinforcement seat 2 is fastened to the end face of the pitch bearing 1, when the two reinforcement seats 2 are tightened, they drive the end faces of the pitch bearing 1 at both ends of the crack to press against each other, thereby realizing the crack closing and reinforcement of the pitch bearing 1.

[0050] In this structure, the reinforcement device primarily strengthens the already cracked pitch bearing. The straight-face positioning part 4 supports the end face of the pitch bearing 1, the arc-face positioning part 3 supports the outer circumferential surface of the pitch bearing 1, and the two reinforcement seats 2 are clamped together by the tightening of the first fastening component 5. This achieves localized reinforcement of the cracked pitch bearing and closes the crack, preventing further deterioration and extending the service life of the pitch bearing 1. Furthermore, since the wind turbine blades are located high in the air, the main body of this structure consists of only two reinforcement blocks and several bolts, allowing for installation at high altitudes. Compared to the current method of lowering the hub to replace the pitch bearing, this saves significant manpower and material costs.

[0051] In this embodiment, the reinforcing base 2 includes a reinforcing block 201 and a side plate 202, which are arranged in an L-shape. The intersecting surfaces of the two form an arc-shaped positioning part 3 and a straight-face positioning part 4, respectively. The first fastening component 5 includes double-ended tie bolts 51. The reinforcing block 201 is provided with tie bolt holes, and the tie bolts 51 pass through the tie bolt holes of the two reinforcing blocks 201. Both ends of the double-ended tie bolts 51 are locked by tie nuts 52. In order to improve the tensioning effect and overall strength, multiple double-ended tie bolts 51 are provided. In this embodiment, four are preferred.

[0052] The second fastening assembly 6 includes fastening bolts 61. The end face of the pitch bearing 1 has fastening holes, and the straight positioning part 4 (i.e., on the side plate 202) has hexagonal anti-loosening holes 41. The tail end of the fastening bolt 61 passes through the fastening hole on the side plate and is located within the hexagonal anti-loosening hole 41. An anti-loosening nut 62 for locking the fastening bolt 61 is also located within the hexagonal anti-loosening hole 41. The hexagonal anti-loosening hole 41 prevents the fastening bolt 61 from loosening. It should be noted that since the end face of the pitch bearing 1 itself has fixing bolts for mounting the pitch bearing 1, only the original fixing bolts of the pitch bearing 1 need to be replaced with several fastening bolts 61; no additional holes need to be drilled, thus greatly simplifying the manufacturing process.

[0053] In this embodiment, the two reinforcing seats 2 have notches 21 on their opposite surfaces. The two notches 21 are combined to form a crack observation window 7 for observing cracks. The state of the crack is observed through the crack observation window 7.

[0054] In this embodiment, a monitoring device is used to monitor crack changes. The monitoring device is a displacement sensor (not shown in the figure), which is installed on a reinforcement base 2. The reinforcement base 2 has a sensor mounting hole 22 on its surface facing the other reinforcement base 2. The displacement sensor is installed in the sensor mounting hole 22 and is used to detect the distance between the two reinforcement bases 2. If the original crack has closed (after the tie bolts 51 and fastening bolts 61 are tightened, the pitch bearing crack reinforcement device has been running for a period of time) and then expands to both sides, it will drive the two reinforcement bases 2 to move, and the distance between the two reinforcement bases 2 will also increase. The displacement sensor can monitor the distance between the two reinforcement bases 2, thus reflecting the crack expansion. Combined with the reserved crack observation window 7, crack monitoring is achieved. It should be noted that the sensor can monitor the crack status on the ground. When the crack size exceeds the threshold, it needs to be taken to the air and the crack observation window 7 can be used to view the crack to determine whether the tie bolts 51 and fastening bolts 61 need to be tightened.

[0055] Example 2

[0056] like Figures 3 to 7 As shown, the only difference between the pitch bearing crack reinforcement device in this embodiment and that in embodiment 1 is:

[0057] In this embodiment, two displacement sensors are provided, both mounted on a single reinforcing base 2, and designated as first displacement sensor 81 and second displacement sensor 82, respectively. Two corresponding sensor mounting holes 22 are provided, with the first displacement sensor 81 and the second displacement sensor 82 respectively housed within the two mounting holes 22. The first displacement sensor 81 and the second displacement sensor 82 are arranged sequentially along the thickness direction of the pitch bearing 1. The sensor mounting holes 22 extend through the entire reinforcing base 2. The cables 83 of the two sensors pass through one end of the sensor mounting holes 22 and are routed along the wind turbine hub cable tray, connecting to the internal control cabinet of the hub via the top cover at the front end of the hub. The sensor data acquisition module is installed in the hub control cabinet and ultimately connected to the wind turbine data storage system on the ground.

[0058] By using two displacement sensors, on the one hand, the accuracy of detecting the distance between the two reinforcing seats 2 can be improved, thereby determining whether the tie bolt 51 is loose (loosening will increase the crack). On the other hand, the two displacement sensors can also monitor the offset of the two reinforcing seats 2 relative to the end face of the pitch bearing 1, thereby determining whether the fastening bolt 61 is loose.

[0059] Example 3

[0060] This embodiment discloses a method for reinforcing a cracked pitch bearing, which uses the pitch bearing crack reinforcing device described in Embodiment 2 above.

[0061] like Figure 8 As shown, the method specifically includes the following steps:

[0062] S1. Install the reinforcement device at the crack where the pitch bearing 1 is displaced. Before this or during the installation of the reinforcement seat 2, measure the initial width of the crack as A. This initial width is the initial crack width of the pitch bearing 1, which is an untreated, natural crack.

[0063] S2. Clamp the two reinforcing seats 2 to close the crack. The initial distance B between the two reinforcing seats 2 is measured using the first displacement sensor 81 and the second displacement sensor 82. Specifically, by operating the tie bolt 51, the two reinforcing seats 2 are tightened, causing the crack to close. At this time, there is an initial distance between the two reinforcing seats 2 (this distance may also be 0), which is the aforementioned B.

[0064] S3. After running for a period of time, the first displacement sensor 81 and the second displacement sensor 82 measure the current distances between the two reinforcement seats 2 as C1 and C2, respectively. That is to say, after obtaining the initial distance B, the wind turbine continues to operate, the pitch bearing 1 is in working condition, and at this time the two displacement sensors continuously monitor the distance value between the two reinforcement seats 2 and feed it back to the wind turbine data storage system.

[0065] S4. When C1-B≥A or C2-B≥A, an alarm is triggered, indicating that the first fastening component 5 may be loose and the two reinforcing seats 2 have moved away from each other. At this time, the two reinforcing seats 2 are re-clamped by adjusting the first fastening component 5. C1-B=A means that the two reinforcing seats 2 have moved away from each other until the crack returns to the initial width of A from the closed state. At this time, the tie bolt 51 has loosened. C1-B>A means that the crack is being stretched and expanded, and an early warning is required. C1-B≥A or C2-B≥A is sufficient to satisfy either condition, and the principle is the same for both.

[0066] When C1-B≠C2-B, an alarm is triggered, indicating that the reinforcement seat 2 may have shifted or tilted relative to the end face of the pitch bearing 1, which means that the second fastening assembly 6 may be loose. At this time, the reinforcement seat 2 is fastened to the end face of the pitch bearing 1 by adjusting the fastening bolt 61.

[0067] To avoid monitoring errors, the crack observation window 7 allows for further assessment of whether the tie bolt 51 and fastening bolt 61 need adjustment. Specifically, in S4 above, when C1-B≥A or C2-B≥A, after an alarm is triggered, before adjusting the first fastening component 5, personnel use the equipment to observe the crack state through the crack observation window 7 from a high altitude, and to observe whether there is an opening between the mating surfaces of the two reinforcement seats. This helps verify the alarm result, and then determines whether to adjust the tie bolt 51. Simultaneously, it is also necessary to observe the offset and skew of the two reinforcement seats 2 and the difference in the size of the opening between the mating surfaces of the two reinforcement seats 2. Based on the observation results, it is determined whether the fastening bolt 61 needs adjustment. It should be noted that whenever an alarm occurs, the tie bolt 51 must be adjusted on the machine. The fastening bolt 61 is determined based on the observation results; it may or may not be adjusted. However, for safety reasons, the fastening bolt 61 is maintained simultaneously when adjusting the tie bolt 51.

[0068] Before adjusting the second fastening component 6 after confirming that C1-B ≠ C2-B, the operator uses a machine to observe the offset and tilt of the two reinforcing seats 2 and the difference in the size of the opening between their mating surfaces from a high altitude. Based on the observations, the operator determines whether to adjust the second fastening component 6. Simultaneously, the operator also needs to observe the crack condition (through the crack observation window 7) and whether there is an opening between the mating surfaces of the two reinforcing seats 2. Based on these observations, the operator determines whether to adjust the first fastening component 5. Similarly, whenever an alarm occurs, the operator must adjust the fastening bolt 61. The adjustment of the tie bolt 51 is determined based on the observations; it may or may not be adjusted. However, for safety reasons, the tie bolt 51 is maintained simultaneously when adjusting the fastening bolt 61.

[0069] The pitch bearing crack reinforcement method of this application is for monitoring pitch bearings that have already cracked. The displacement sensor has high accuracy and is not affected by the environment. It monitors the operating status after the original crack has closed and can detect the development of cracks in time. The setting of crack observation window 7 further improves crack monitoring, avoids monitoring errors, enables timely maintenance, and ensures stable operation of the wind turbine.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for reinforcing cracked pitch bearings, characterized in that: The device includes two reinforcing seats (2), each of which has an arc-shaped positioning part (3) and a straight-face positioning part (4). The arc-shaped positioning part (3) and the straight-face positioning part (4) are arranged in an L-shape. The two reinforcing seats (2) are respectively installed at both ends of the crack in the pitch bearing (1). The arc-shaped positioning part (3) is in contact with the outer circumferential surface of the pitch bearing (1), and the straight-face positioning part (4) is in contact with the end face of the pitch bearing (1). The straight-face positioning parts (4) of the two reinforcing seats (2) are located on the same side of the end face of the pitch bearing (1). The two reinforcing seats (2) are clamped together by a first fastening component (5), and each straight-face positioning part (4) is fastened to the end face of the pitch bearing (1) by a second fastening component (6). The two reinforcing seats (2) have notches (21) on their opposite surfaces. The two notches (21) are combined to form a crack observation window (7) for observing the crack. The fastening assembly (5) includes a double-ended tie bolt (51), the reinforcement base (2) is provided with tie bolt holes, the double-ended tie bolt (51) passes through the tie bolt holes of the two reinforcement bases (2), and both ends of the double-ended tie bolt (51) are locked by tie nuts (52); the second fastening assembly (6) includes a fastening bolt (61), the end face of the pitch bearing (1) is provided with a fastening hole, the straight positioning part (4) is provided with a hexagonal anti-loosening hole (41), the tail end of the fastening bolt (61) passes through the fastening hole and is located in the hexagonal anti-loosening hole (41), and the anti-loosening nut (62) for locking the fastening bolt (61) is located in the hexagonal anti-loosening hole (41); one of the reinforcement bases (2) is provided with a sensor mounting hole (22), and the sensor mounting hole (22) is provided with a displacement sensor for detecting the distance between the two reinforcement bases (2).

2. A device for reinforcing cracked pitch bearings, characterized in that: Includes two reinforcing seats (2), each reinforcing seat (2) having an arc-shaped positioning part (3) and a straight-face positioning part (4), the arc-shaped positioning part (3) and the straight-face positioning part (4) being arranged in an L-shape. The two reinforcing seats (2) are respectively installed at both ends of the crack in the pitch bearing (1). The arc-shaped positioning part (3) is in contact with the outer circumferential surface of the pitch bearing (1), and the straight-face positioning part (4) is in contact with the end face of the pitch bearing (1). The straight-face positioning parts (4) of the two reinforcing seats (2) are located on the same side of the end face of the pitch bearing (1). 2) The first fastening component (5) clamps between them, and each straight positioning part (4) is fastened to the end face of the pitch bearing (1) by the second fastening component (6). One of the reinforcing bases (2) is provided with a sensor mounting hole (22). Two sensor mounting holes (22) are provided. The first displacement sensor (81) and the second displacement sensor (82) are respectively provided in the two sensor mounting holes (22). The first displacement sensor (81) and the second displacement sensor (82) are arranged sequentially in the thickness direction of the pitch bearing (1).

3. A method for reinforcing a pitch bearing crack based on the pitch bearing crack reinforcement device according to claim 2, characterized in that, Includes the following steps: S1. Install the reinforcement device at the crack in the pitch bearing (1). Before or during the installation process, measure the initial width of the crack as A. S2. Clamp the two reinforcing seats (2) to close the crack. Use the first displacement sensor (81) and the second displacement sensor (82) to measure the initial distance between the two reinforcing seats (2) as B. S3. After running for a period of time, the first displacement sensor (81) and the second displacement sensor (82) measured the current distances between the two reinforcing seats (2) as C1 and C2, respectively. S4. When C1-B≥A or C2-B≥A, an alarm is triggered, indicating that the first fastening component (5) may be loose and the two reinforcing seats (2) have moved away from each other. At this time, the two reinforcing seats (2) can be re-clamped by adjusting the first fastening component (5). An alarm is triggered when C1-B≠C2-B, indicating that the second fastening assembly (6) may be loose and the reinforcing seat (2) may be offset or skewed relative to the end face of the pitch bearing (1). At this time, the second fastening assembly (6) is adjusted to fasten the reinforcing seat (2) to the end face of the pitch bearing (1).

4. The method for reinforcing cracked pitch bearings according to claim 3, characterized in that, A notch (21) is provided on the opposite surface of the two reinforcing seats (2). After the two notches (21) are merged, a crack observation window (7) is formed for observing the crack. In step S4, before adjusting the first fastening component (5), the state of the crack is observed through the crack observation window (7) and whether there is an opening between the mating surfaces of the two reinforcing seats (2). The first fastening component (5) is adjusted according to the observation results. At the same time, the offset and skew of the two reinforcing seats (2) and the different opening sizes of the mating surfaces of the two reinforcing seats (2) are also observed. The second fastening component (6) is adjusted according to the observation results. Before adjusting the second fastening component (6), observe the offset and skew of the two reinforcing seats (2) and the different opening sizes of the mating surfaces of the two reinforcing seats (2). Based on the observation results, determine whether to adjust the second fastening component (6). At the same time, observe the crack state and whether there is an opening between the mating surfaces of the two reinforcing seats (2). Based on the observation results, determine whether it is necessary to adjust the first fastening component (5).

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