Variable pitch bearing cracking reinforcing device and reinforcing method

Abstract

The invention relates to the field of wind turbine generators, in particular to a variable pitch bearing cracking reinforcing device and method. The device comprises two reinforcing seats, each reinforcing seat is provided with a cambered surface positioning part and a straight surface positioning part, the two reinforcing seats are installed at the two ends of a crack of the variable-pitch bearing respectively, the cambered surface positioning parts are attached to the outer circumferential surface of the variable-pitch bearing, the straight surface positioning parts are attached to the end face of the variable-pitch bearing, and the two reinforcing seats are clamped through a first fastening assembly. And each straight surface positioning part is fastened on the end surface of the variable pitch bearing through a second fastening assembly. The method comprises the steps that the initial width of a crack is obtained, the initial distance between the two reinforcing bases is collected, the current distance between the two reinforcing bases is collected, the relation between the current distance, the initial distance and the initial width is established, and an alarm is given according to a threshold value. The variable-pitch bearing crack folding is realized, the crack deterioration is prevented, the local connection strength of the variable-pitch bearing is enhanced, the service life of the variable-pitch bearing is prolonged, the mounting structure is simplified, and the mounting and maintenance cost is reduced.

Description

Technical Field

[0001] The present application relates to a wind turbine generator set, and more particularly to a pitch bearing crack reinforcement device and reinforcement method. Background Art

[0002] In the wind power industry, due to the complex application conditions of variable pitch bearings and the long-term combined effects of various loads, cracking of variable pitch bearings often occurs, which is a very difficult problem that plagues the industry. How to deal with cracked variable pitch bearings is crucial. If not handled in time, cracking of variable pitch bearings will cause failure of wind turbines and cause huge economic losses. If the variable pitch bearings are replaced, three variable pitch bearings need to be replaced together, and the entire hub needs to be lifted down, which is very costly.

[0003] At present, cracking and failure of pitch bearings are common in the industry. The common technology in the industry is to add an annular 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: (1) Installing a support flange on the end face can strengthen the connection strength of the pitch bearing to a certain extent, but it has limited effect on preventing the pitch bearing from cracking and preventing the crack extension of the pitch bearing. There is support only on the end face of the pitch bearing, and no reinforcement support is provided on the outer diameter surface. Often, the crack of the pitch bearing starts from the ball hole on the outer diameter surface and extends to the end face. It is difficult to prevent the crack from deteriorating, thus reducing the service life of the pitch bearing.

[0004] (2) The existing treatment method after cracking is to take the tower down and return it to the factory for inspection and repair. All three variable pitch bearings need to be replaced, which requires expensive lifting and transportation costs, causing huge economic losses. In addition, the reliability of the variable pitch bearings in the original replacement plan has not been improved, and secondary cracking may occur, causing huge economic losses.

[0005] In addition, the current methods for monitoring cracks in variable pitch bearings include the use of acoustic emission sensors, video monitoring, conductive paint, and built-in power lines in the inner and outer rings to form a closed circuit. Pitch bearing crack monitoring has certain limitations: video monitoring is easily blocked by oil stains, and it is impossible to monitor the cracked variable pitch bearings that have been cracked and installed with reinforcement rings; conductive paint cannot monitor the crack expansion of cracked variable pitch bearings; the method of built-in tight wires in the inner and outer rings causes the wires to break after cracking, thereby breaking the circuit to achieve the purpose of monitoring. This method may also cause the built-in wires to break after the variable pitch bearing is deformed under load, resulting in erroneous monitoring; the acoustic emission sensor method is easily disturbed by the stress release of other parts of the hub during operation, as well as the noise and friction and wear sound generated by other parts in the wind turbine, resulting in inaccurate detection results. Summary of the invention

[0006] In order to solve the problems of reduced strength, reduced service life, high maintenance cost, etc. of existing variable pitch bearings after cracking, the present application provides a variable pitch bearing crack reinforcement device and reinforcement method.

[0007] In the first aspect, a pitch bearing crack reinforcement device provided in the present application adopts the following technical solution: A pitch bearing crack reinforcement device comprises two reinforcement seats, wherein the reinforcement seats are provided with an arc surface positioning portion and a straight surface positioning portion, the arc surface positioning portion and the straight surface positioning portion are arranged in an L shape, and the two reinforcement seats are respectively installed at two ends of a crack in the pitch bearing, the arc surface positioning portion is in contact with the outer circumferential surface of the pitch bearing, and the straight surface positioning portion is in contact with the end surface of the pitch bearing, the straight surface positioning portions of the two reinforcement seats are located on the same side of the end surface of the pitch bearing, the two reinforcement seats are clamped by a first fastening assembly, and each straight surface positioning portion is fastened to the end surface of the pitch bearing by a second fastening assembly.

[0008] By adopting the above technical scheme, the reinforcement device is mainly used to strengthen the cracked pitch bearing. The straight surface positioning part supports the end face of the pitch bearing, and the arc surface positioning part supports the outer circumferential surface of the pitch bearing. Since the reinforcement seat is fixed to the end face of the pitch bearing by the straight surface positioning part, the two reinforcement seats are clamped by tightening the first fastening component, driving the end face of the pitch bearing to tighten at the crack, thereby achieving local reinforcement of the cracked pitch bearing and closing of the cracks, preventing the cracks from further deteriorating, and extending the service life of the pitch bearing. Compared with the full circle reinforcement ring, the local reinforcement seat is small, light in weight, and can be more convenient to install.

[0009] As a further improvement of the above technical solution, notches are provided on the opposite surfaces of the two reinforcement seats, and the two notches are combined to form a crack observation window for observing the cracks.

[0010] By adopting the above technical solution, the crack observation window can intuitively obtain the state of the crack, thereby facilitating the treatment of the crack.

[0011] As a further improvement of the above technical solution, the first fastening assembly includes a double-headed tension bolt, and the reinforcement seat is provided with a tension bolt hole. The tension bolt passes through the tension bolt holes of the two reinforcement seats, and both ends of the double-headed tension bolt are locked by tension nuts.

[0012] By adopting the above technical solution, the locking strength of the double-headed tension bolt is large, the structure is stable, and the processing of the reinforcement seat is simple.

[0013] As a further improvement of the above technical solution, the second fastening assembly includes a fastening bolt, the end face of the variable pitch bearing is provided with a fastening hole, the straight face positioning portion 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.

[0014] By adopting the above technical solution, the cooperation between the fastening bolts and the hexagonal anti-loosening holes can effectively prevent loosening and improve the overall fastening stability.

[0015] As a further improvement of the above technical solution, a sensor mounting hole is provided on one of the reinforcement seats, and a displacement sensor for detecting the distance between the two reinforcement seats is provided in the sensor mounting hole.

[0016] By adopting the above technical solution, the distance between the two reinforcement seats can be monitored by a displacement sensor, which can reflect the crack expansion and realize crack monitoring.

[0017] In the second aspect, another pitch bearing crack reinforcement device provided by the present application adopts the following technical solution: A pitch bearing crack reinforcement device comprises two reinforcement seats, wherein the reinforcement seats are provided with an arc surface positioning portion and a straight surface positioning portion, the arc surface positioning portion and the straight surface positioning portion are arranged in an L shape, and the two reinforcement seats are respectively installed at two ends of a crack of the pitch bearing, the arc surface positioning portion is in contact with the outer circumferential surface of the pitch bearing, and the straight surface positioning portion is in contact with the end surface of the pitch bearing, the straight surface positioning portions of the two reinforcement seats are located on the same side of the end surface of the pitch bearing, the two reinforcement seats are clamped by a first fastening assembly, and each straight surface positioning portion is fastened to the end surface of the pitch bearing by a second fastening assembly, one of the reinforcement seats is provided with a sensor mounting hole, and two sensor mounting holes are provided, and a first displacement sensor and a second displacement sensor are respectively provided in the two sensor mounting holes, and the first displacement sensor and the second displacement sensor are sequentially arranged in the thickness direction of the pitch bearing.

[0018] By using two displacement sensors, on the one hand, the accuracy of detecting the distance between the two reinforcement seats can be improved, thereby determining whether the first fastening assembly is loose (the crack will increase after loosening); on the other hand, the two displacement sensors can also monitor the offset of the two reinforcement seats relative to the end face of the pitch bearing, thereby determining whether the second fastening assembly is loose.

[0019] The present application provides a pitch bearing crack reinforcement method as described above in another pitch bearing crack reinforcement device, comprising the following steps: S1. Install the reinforcement device at the crack of the pitch bearing displacement. Before or during the installation, measure the initial width of the crack to be A. S2, clamping the two reinforcement seats to close the cracks, and using the first displacement sensor and the second displacement sensor to measure the initial distance between the two reinforcement seats to be B; S3, after running for a period of time, the first displacement sensor and the second displacement sensor measure the current distances between the two reinforcement seats to be C1 and C2 respectively; S4. When C1-B≥A or C2-B≥A, an alarm is triggered, indicating that the first fastening assembly may be loose and the two reinforcement seats are moving away from each other. At this time, the first fastening assembly is adjusted to re-clamp the two reinforcement seats. When C1-B≠C2-B, an alarm is sounded, indicating that the second fastening assembly may be loose and the reinforcement seat may be offset and skewed relative to the end face of the pitch bearing. At this time, the reinforcement seat is fastened to the end face of the pitch bearing by adjusting the second fastening assembly.

[0020] As a further improvement of the above technical solution, a notch is provided on the opposite surfaces of the two reinforcement seats, and the two notches are combined to form a crack observation window 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 two reinforcement seat joint surfaces are observed through the crack observation window, and the first fastening component is clearly adjusted according to the observation results. At the same time, it is also necessary to observe the deviation and skewness of the two reinforcement seats and the different opening sizes of the two reinforcement seat joint surfaces, and determine whether the second fastening component needs to be adjusted according to the observation results; Before adjusting the second fastening component, observe the offset and skewness of the two reinforcement seats and the different sizes of the openings of the two reinforcement seat joint surfaces. Adjust the second fastening component based on the observation results. At the same time, observe the crack state and whether there is an opening between the two reinforcement seat joint surfaces. Determine whether the first fastening component needs to be adjusted based on the observation results.

[0021] By adopting the above technical solution, for monitoring the cracked pitch bearing, two displacement sensors are used with high accuracy and are not affected by the environment. The operating status after the original cracks are closed can be monitored, and the development status of the cracks can be discovered in time. The setting of the crack observation window further improves the monitoring of cracks, avoids monitoring errors, and achieves timely maintenance to ensure stable operation of the wind turbine.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. A pair of reinforcement seats are used to support the end face and outer diameter surface of the pitch bearing. The two arc blocks are clamped by tightening the first fastening component to close the cracks of the cracked pitch bearing, prevent the cracks from further deteriorating, strengthen the local connection strength of the pitch bearing, and extend the service life of the pitch bearing.

[0023] 2. Compared with the full circle reinforcement ring, the reinforcement seat has a small structure and light weight, which makes it easier to install and reduces costs.

[0024] 3. The installation process is simple and easy to operate. The installation can be carried out in the air using a hanging basket without hanging down the hub. Compared with the current solution of hanging down the hub 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.

[0025] 4. Compared with the existing variable pitch bearing crack monitoring device which is more focused on monitoring cracks from scratch, this application is mainly aimed at monitoring cracked variable pitch bearings. The displacement sensor has high accuracy and is not affected by the environment. It monitors the operating status after the original cracks are closed and can promptly discover the development status of the cracks. The setting of the crack observation window further improves the crack monitoring, enables timely maintenance, and ensures stable operation of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the pitch bearing crack reinforcement device of Example 1 of the present application.

[0027] Figure 2 It is a schematic diagram of the back structure of the reinforcement seat in Example 1 of the present application.

[0028] Figure 3 It is a schematic diagram of the front structure of the reinforcement seat in Example 1 of the present application.

[0029] Figure 4 It is a schematic diagram of the back structure of the reinforcement seat in Example 2 of the present application.

[0030] Figure 5 It is a schematic diagram of the front structure of the reinforcement seat in Example 2 of the present application.

[0031] Figure 6 It is a structural schematic diagram of the first and second displacement sensors installed on the reinforcement base in Example 2 of the present application.

[0032] Figure 7 It is a cross-sectional schematic diagram of the reinforcement seat in Example 2 of the present application.

[0033] Figure 8 It is a schematic diagram of the process of the pitch bearing crack reinforcement method of Example 3 of the present application.

[0034] Explanation of the reference numerals in the accompanying drawings: 1. Paddle bearing; 2. Reinforcement seat; 201. Reinforcement block; 202. Side panel; 21. Recess; 22. Sensor mounting hole; 3. Arc surface positioning portion; 4. Straight surface positioning portion; 41. Hexagonal anti-loosening hole; 5. First fastening assembly; 51. Tension bolt; 52. Tension 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 DESCRIPTION

[0035] The following is combined with Figure 1-8 This application is described in further detail.

[0036] The directional words such as "upper", "lower", "left", "right", "front", and "back" in this application only represent the relative positions in the drawings and are for the convenience of describing this application. They do not represent the absolute positions of the products and should not be regarded as limitations on this application.

[0037] Example 1 An embodiment of the present application discloses a pitch bearing crack reinforcement device.

[0038] like Figure 1 and Figure 2 As shown, the pitch bearing crack reinforcement device of this embodiment includes two reinforcement seats 2, and the two reinforcement seats 2 have the same structure. The reinforcement seat 2 is provided with an arc surface positioning portion 3 and a straight surface positioning portion 4, and the arc surface positioning portion 3 and the straight surface positioning portion 4 are arranged in an L shape. When in use, the two reinforcement seats 2 are placed at both ends of the pitch bearing 1 with cracks, and the two are installed on the pitch bearing 1 against each other, wherein the arc surface positioning portion 3 of each reinforcement seat 2 is in contact with the outer circumferential surface of the pitch bearing 1, and the straight surface positioning portion 4 is in contact with the end face of the pitch bearing 1, and the straight surface positioning portions 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 arranged symmetrically relative to the crack. Each straight-face positioning portion 4 is fastened to the end face of the pitch bearing 1 by a second fastening assembly 6, and the two reinforcement seats 2 are clamped by a first fastening assembly 5. Since the straight-face positioning portion 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, the end faces of the pitch bearing 1 at both ends of the crack are driven to tighten, thereby realizing the crack shrinkage and reinforcement of the pitch bearing 1.

[0039] In this structure, the reinforcement device is mainly used to strengthen the 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 by tightening the first fastening component 5 to achieve local reinforcement of the cracked pitch bearing and the closing of the cracks, prevent the cracks from further deteriorating, and extend the service life of the pitch bearing 1. In addition, since the blades of the wind turbine are in the air, the main body of the structure is only two reinforcement blocks and several bolts, which can be installed in the air. Compared with the current solution of hanging the hub down to replace the pitch bearing, it saves huge manpower and material costs.

[0040] In this embodiment, the reinforcement seat 2 includes a reinforcement block 201 and a side plate 202, which are arranged in an L shape, and the intersecting surfaces of the two constitute the arc surface positioning portion 3 and the straight surface positioning portion 4 respectively. The first fastening component 5 includes a double-headed tension bolt 51, and a tension bolt hole is provided on the reinforcement block 201. The tension bolt 51 passes through the tension bolt holes of the two reinforcement blocks 201, and both ends of the double-headed tension bolt 51 are locked by tension nuts 52. In order to improve the tightening effect and overall strength, a plurality of double-headed tension bolts 51 are provided, and four are preferably provided in this embodiment.

[0041] The second fastening assembly 6 includes a fastening bolt 61, a fastening hole is provided on the end face of the pitch bearing 1, a hexagonal anti-loosening hole 41 is provided on the face positioning portion 4 (i.e., on the side plate 202), the tail end of the fastening bolt 61 passes through the fastening hole on the side plate and is located in the hexagonal anti-loosening hole 41, and the anti-loosening nut 62 used to lock the fastening bolt 61 is located in the hexagonal anti-loosening hole 41. The hexagonal anti-loosening hole 41 can prevent the fastening bolt 61 from loosening. It should be noted that since the end face of the pitch bearing 1 itself has a fixing bolt for installing the pitch bearing 1, it is only necessary to replace the original several fixing bolts of the pitch bearing 1 with several fastening bolts 61, and no additional holes need to be opened, thereby greatly simplifying the processing.

[0042] In this embodiment, notches 21 are provided on the opposite surfaces of the two reinforcement seats 2 , and the two notches 21 are combined to form a crack observation window 7 for observing cracks, through which the state of the cracks can be observed.

[0043] In this embodiment, a monitoring component is provided to monitor the change of the crack. The monitoring component is a displacement sensor (not shown in the figure), which is installed on a reinforcement seat 2. The reinforcement seat 2 is provided with a sensor mounting hole 22. The sensor mounting hole 22 is on the surface of the reinforcement seat 2 facing the other reinforcement seat 2. The displacement sensor is installed in the sensor mounting hole 22 and is used to detect the distance between the two reinforcement seats 2. If the original crack is closed (after the tension bolts 51 and the fastening bolts 61 are respectively locked, the variable pitch bearing crack reinforcement device is operated for a period of time), when it expands to both sides, it drives the two reinforcement seats 2 to move, and the distance between the two reinforcement seats 2 will also increase. The distance between the two reinforcement seats 2 can be monitored by the displacement sensor, which can reflect the crack expansion situation. Combined with the reserved crack observation window 7, the crack monitoring is realized. It should be noted that the sensor can be used to monitor the state of the crack on the ground. When the size of the crack exceeds the threshold, it is necessary to go on the plane to the air and check the crack through the crack observation window 7 to determine whether it is necessary to lock the tension bolts 51 and the fastening bolts 61.

[0044] Example 2 like Figures 3 to 7 As shown, the pitch bearing crack reinforcement device of this embodiment is different from that of embodiment 1 only in that: In this embodiment, two displacement sensors are provided, and both displacement sensors are on a reinforcement seat 2, and are calibrated as the first displacement sensor 81 and the second displacement sensor 82, respectively. Two corresponding sensor mounting holes 22 are provided, and 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 in sequence in the thickness direction of the pitch bearing 1. The sensor mounting hole 22 runs through the entire reinforcement seat 2, and the cables 83 of the two sensors pass through one end of the sensor mounting hole 22 and the other end, and are laid along the wiring rack of the wind turbine hub, and are connected to the internal control cabinet of the hub through the top cover position of the front end of the hub, and the sensor data acquisition module is installed in the hub control cabinet, and finally connected to the wind turbine data storage system on the ground.

[0045] By using two displacement sensors, on the one hand, the accuracy of detecting the distance between the two reinforcement seats 2 can be improved, thereby determining whether the tension bolts 51 are loose (the cracks will increase after loosening); on the other hand, the two displacement sensors can also monitor the offset of the two reinforcement seats 2 relative to the end faces of the pitch bearing 1, thereby determining whether the fastening bolts 61 are loose.

[0046] Example 3 This embodiment discloses a pitch bearing crack reinforcement method, which adopts the pitch bearing crack reinforcement device in the above-mentioned embodiment 2.

[0047] like Figure 8 As shown, the method specifically comprises the following steps: S1. Install the reinforcement device at the crack of the displacement of the pitch bearing 1. Before or during the installation of the reinforcement seat 2, the initial width of the crack is measured to be A. The initial width is the initial crack width of the pitch bearing 1, which is a crack in a natural state without treatment; S2, clamp the two reinforcement seats 2 to close the crack, and use the first displacement sensor 81 and the second displacement sensor 82 to measure the initial distance between the two reinforcement seats 2 as B. Specifically, by operating the tension bolts 51, the two reinforcement seats 2 are tightened to close the crack, and at this time, there is an initial distance between the two reinforcement seats 2 (the distance may also be 0), which is the aforementioned B.

[0048] 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 to be C1 and C2 respectively. That is, after obtaining the initial distance B, the wind turbine keeps working, and the pitch bearing 1 is in a working state. At this time, the two displacement sensors keep monitoring the distance value between the two reinforcement seats 2 and feed it back to the wind turbine data storage system.

[0049] S4. When C1-B≥A, or C2-B≥A, an alarm is issued, indicating that the first fastening component 5 may be loose, and the two reinforcement seats 2 have moved away from each other. At this time, the two reinforcement seats 2 are re-clamped by adjusting the first fastening component 5, wherein C1-B=A indicates that the two reinforcement seats 2 move away from each other until the crack recovers from the closed state to the state of the initial width A. At this time, the tension bolt 51 has been loosened, and C1-B>A indicates that the crack is continuously pulled and expanded, and timely warning is required; C1-B≥A or C2-B≥A only needs to meet one condition, and the principles of the two are the same; When C1-B≠C2-B, an alarm is issued, which means that the reinforcement seat 2 may be offset and skewed relative to the end face of the pitch bearing 1, indicating 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 bolts 61.

[0050] In order to avoid errors in monitoring, the setting of the crack observation window 7 can further determine whether it is necessary to adjust the tension bolts 51 and the fastening bolts 61. Specifically, in the above S4, when C1-B≥A or C2-B≥A is obtained, after the alarm, before the first fastening component 5 needs to be adjusted, the staff will use the equipment to observe the state of the crack through the crack observation window 7 at high altitude, and observe whether there is an opening between the joint surfaces of the two reinforcement seats, to assist in verifying the alarm result, and then determine to adjust the tension bolts 51. At the same time, it is also necessary to observe the offset and skewness of the two reinforcement seats 2 and the different sizes of the joint surfaces of the two reinforcement seats 2, and determine whether it is necessary to adjust the fastening bolts 61 based on the observation results. It should be noted that as long as an alarm occurs, the tension bolts 51 must be adjusted on the machine, and the fastening bolts 61 can be adjusted or not based on the observation results. However, for safety reasons, when adjusting the tension bolts 51, the fastening bolts 61 should be maintained at the same time.

[0051] After obtaining C1-B≠C2-B and before adjusting the second fastening assembly 6, the staff will go on board the equipment and observe the deviation and skewness of the two reinforcement seats 2 and the different sizes of the openings of the two reinforcement seats 2 joint surfaces from a high altitude. According to the observation results, the second fastening assembly 6 will be adjusted clearly. At the same time, it is also necessary to observe the crack state (through the crack observation window 7) and whether there is an opening between the joint surfaces of the two reinforcement seats 2. According to the observation results, it is determined whether the first fastening assembly 5 needs to be adjusted. Similarly, as long as an alarm occurs, the fastening bolt 61 must be adjusted on board. The tension bolt 51 can be adjusted or not according to the observation results. However, for safety reasons, when adjusting the fastening bolt 61, the tension bolt 51 should be maintained at the same time.

[0052] The pitch bearing crack reinforcement method of the present application is to monitor the pitch bearing that has been cracked. The displacement sensor has high accuracy and is not affected by the environment. It monitors the operating status after the original cracks are closed and can promptly discover the development status of the cracks. The setting of the crack observation window 7 further improves the crack monitoring, avoids monitoring errors, and performs timely maintenance to ensure stable operation of the wind turbine.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pitch bearing crack reinforcement device, characterized in that: The invention comprises two reinforcement seats (2), wherein the reinforcement seats (2) are provided with an arc surface positioning portion (3) and a straight surface positioning portion (4), wherein the arc surface positioning portion (3) and the straight surface positioning portion (4) are arranged in an L shape, and the two reinforcement seats (2) are respectively mounted at two ends of a crack of a pitch bearing (1), wherein the arc surface positioning portion (3) is fitted with the outer circumferential surface of the pitch bearing (1), and the straight surface positioning portion (4) is fitted with the end surface of the pitch bearing (1), and the straight surface positioning portions (4) of the two reinforcement seats (2) are located on the same side of the end surface of the pitch bearing (1), and the two reinforcement seats (2) are clamped by a first fastening assembly (5), and each straight surface positioning portion (4) is fastened to the end surface of the pitch bearing (1) by a second fastening assembly (6).

2. The pitch bearing crack reinforcement device according to claim 1, characterized in that: Notches (21) are provided on the opposing surfaces of the two reinforcement seats (2), and the two notches (21) are combined to form a crack observation window (7) for observing the crack.

3. The pitch bearing crack reinforcement device according to claim 1 or 2, characterized in that: The first fastening assembly (5) comprises a double-headed tension bolt (51), the reinforcement seat (2) is provided with a tension bolt hole, the tension bolt (51) penetrates the tension bolt holes of the two reinforcement seats (2), and both ends of the double-headed tension bolt (51) are locked by tension nuts (52).

4. The pitch bearing crack reinforcement device according to claim 1 or 2, characterized in that: The second fastening assembly (6) comprises a fastening bolt (61), the end surface of the pitch bearing (1) is provided with a fastening hole, the straight surface positioning portion (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 a anti-loosening nut (62) for locking the fastening bolt (61) is located in the hexagonal anti-loosening hole (41).

5. The pitch bearing crack reinforcement device according to claim 1 or 2, characterized in that: A sensor mounting hole (22) is provided on one of the reinforcement seats (2), and a displacement sensor for detecting the distance between the two reinforcement seats (2) is provided in the sensor mounting hole (22).

6. A pitch bearing crack reinforcement device, characterized in that: The invention comprises two reinforcement seats (2), wherein the reinforcement seats (2) are provided with an arc surface positioning portion (3) and a straight surface positioning portion (4), wherein the arc surface positioning portion (3) and the straight surface positioning portion (4) are arranged in an L shape, and the two reinforcement seats (2) are respectively mounted at two ends of a crack of a variable pitch bearing (1), wherein the arc surface positioning portion (3) is fitted with the outer circumferential surface of the variable pitch bearing (1), and the straight surface positioning portion (4) is fitted with the end surface of the variable pitch bearing (1), and the straight surface positioning portions (4) of the two reinforcement seats (2) are located on the same side of the end surface of the variable pitch bearing (1), and the two reinforcement seats ( 2) are clamped by a first fastening assembly (5), and each straight-face positioning portion (4) is fastened to an end surface of the pitch bearing (1) by a second fastening assembly (6), one of the reinforcement seats (2) is provided with a sensor mounting hole (22), two of the sensor mounting holes (22) are provided, a first displacement sensor (81) and a second displacement sensor (82) are provided in the two sensor mounting holes (22), and the first displacement sensor (81) and the second displacement sensor (82) are provided in sequence in a thickness direction of the pitch bearing (1).

7. A pitch bearing crack reinforcement method based on the pitch bearing crack reinforcement device according to claim 6, characterized in that: The following steps are involved: S1. Install the reinforcement device at the crack of the displacement of the pitch bearing (1), and before or during the installation, measure the initial width of the crack to be A; S2, clamping the two reinforcement seats (2) so that the cracks are closed, and using the first displacement sensor (81) and the second displacement sensor (82) to measure the initial distance between the two reinforcement seats (2) to be B; 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) to be C1 and C2 respectively; S4. When C1-B≥A or C2-B≥A, an alarm is sounded, indicating that the first fastening component (5) may be loose and the two reinforcement seats (2) have moved away from each other. At this time, the two reinforcement seats (2) are re-clamped by adjusting the first fastening component (5). When C1-B≠C2-B, an alarm is triggered, indicating that the second fastening assembly (6) may be loose and the reinforcement seat (2) may be offset and skewed relative to the end face of the pitch bearing (1). At this time, the reinforcement seat (2) is fastened to the end face of the pitch bearing (1) by adjusting the second fastening assembly (6).

8. The pitch bearing crack reinforcement method according to claim 6, characterized in that: A notch (21) is provided on the opposite surfaces of the two reinforcement seats (2), and the two notches (21) are combined to form a crack observation window (7) for observing the crack. In step S4, before adjusting the first fastening component (5), the state of the crack and whether there is an opening between the joint surfaces of the two reinforcement seats (2) are observed through the crack observation window (7). The first fastening component (5) is clearly adjusted based on the observation results. At the same time, the deviation and skewness of the two reinforcement seats (2) and the different opening sizes of the joint surfaces of the two reinforcement seats (2) are also observed. Based on the observation results, it is determined whether the second fastening component (6) needs to be adjusted; Before adjusting the second fastening component (6), observe the deviation and skewness of the two reinforcement seats (2) and the different sizes of the openings of the joint surfaces of the two reinforcement seats (2). Adjust the second fastening component (6) based on the observation results. At the same time, observe the crack state and whether there is an opening between the joint surfaces of the two reinforcement seats (2). Based on the observation results, determine whether the first fastening component (5) needs to be adjusted.

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