Power supply device of variable pitch bearing crack monitoring system of wind turbine generator

Abstract

According to the power supply device of the wind turbine generator variable pitch bearing crack monitoring system, the conductor rail is installed on the surface of the wind turbine generator variable pitch bearing, the current collector brush head of the current collector is in sliding contact with the conductor rail, and alternating current from the electrical control cabinet is converted into direct current through the power switch; and the power is supplied to the conductor rail through the insulated wire and the current collector brush head in sequence, and finally, the electric energy is directly conducted to the variable pitch bearing crack monitoring system to be used by the variable pitch bearing crack monitoring system. The variable pitch bearing serves as a rotating part, the current collector brush head serves as a static part, continuous power supply between the rotating part and the static part can be achieved through combination of the conductor rail and the current collector brush head, and good power supply power can be guaranteed through the power switch and the electric control cabinet. The technical problem of unstable power supply of the storage battery of the variable-pitch bearing crack monitoring system of the wind generating set is effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine technology, and specifically relates to a power supply device for a wind turbine pitch bearing crack monitoring system. Background Technology

[0002] The pitch bearing of a wind turbine, as a large rotating component connecting the wind turbine blades and hub, is used to enable the blades to rotate within a certain angle. After a period of operation, the pitch bearing is prone to cracking, which can easily lead to serious accidents such as blade detachment, overspeeding, and tower collapse. The pitch bearing crack monitoring system is mainly used to monitor for cracks in the pitch bearing and issue alarm signals in a timely manner to prevent the accident from escalating.

[0003] In the operation of modern wind turbines, crack monitoring of pitch bearings is crucial for ensuring the safe and stable operation of the unit. Traditional pitch bearing crack monitoring systems mainly rely on batteries for offline power to maintain their operation.

[0004] However, this power supply method has many drawbacks. The performance of the battery itself is affected by various factors, such as temperature changes, increased service life, and frequent charging and discharging processes, causing its output voltage to be unstable. When the power supply voltage fluctuates or is insufficient, the normal operation of the monitoring system will be interfered with, making accurate crack detection impossible. Over time, the failure rate of equipment caused by power supply voltage problems remains high, seriously affecting the safe operation and maintenance efficiency of wind turbines, increasing maintenance costs and downtime.

[0005] Therefore, there is an urgent need for a wind turbine pitch bearing crack monitoring system that can solve the problem of unstable power supply and reduce the failure rate of the equipment. Utility Model Content

[0006] The purpose of this utility model is to provide a power supply device for a wind turbine pitch bearing crack monitoring system, which can ensure good power supply through AC and DC power supply.

[0007] To solve the above-mentioned technical problems, this utility model provides a power supply device for a wind turbine pitch bearing crack monitoring system, including a conductive rail assembly, several current collectors, a power switch, and an electrical control cabinet.

[0008] The conductive rail assembly is arranged circumferentially around the pitch bearing, and the conductive rail assembly includes multiple conductive rails, each of which contains a conductor.

[0009] Each current collector includes a current collector brush head, a current collector brush plate, an insulated wire, and a brush head fixing plate. One end of the current collector brush plate is connected to the current collector brush head, and the other end is connected to one end of the insulated wire. The brush head fixing plate is rotatably connected to the current collector brush plate. The current collector brush head is used to slide in contact with the conductive rail and supply power to the conductive rail.

[0010] The input terminal of the power switch is connected to the electrical control cabinet, and the output terminal of the power switch is connected to the other end of the insulated wire of each current collector.

[0011] Optionally, in the power supply device of the wind turbine pitch bearing crack monitoring system described above, at least one side of the conductive rail is provided with a water-blocking protrusion and / or a water-guiding groove.

[0012] Optionally, in the power supply device of the wind turbine pitch bearing crack monitoring system described above, the current collector further includes a magnetic fixing base, which is connected to the brush head fixing plate and is used for magnetic connection of the fixed components of the wind turbine.

[0013] Optionally, in the power supply device of the wind turbine pitch bearing crack monitoring system described above, the current collector further includes a tension mechanism. The tension mechanism includes an upper connecting rod of the current collector, a lower connecting rod of the current collector, a connecting rod spring, and a connecting rod fixing plate. The front ends of the upper connecting rod and the lower connecting rod of the current collector are respectively hinged to the brush head fixing plate, and the rear ends of the upper connecting rod and the lower connecting rod of the current collector are respectively hinged to the connecting rod fixing plate. The two ends of the connecting rod spring are respectively connected to the upper connecting rod and the lower connecting rod of the current collector.

[0014] Optionally, in the power supply device of the above-mentioned wind turbine pitch bearing crack monitoring system, the upper connecting rod and the lower connecting rod of the collector are arranged in parallel, one end of the connecting rod spring is connected to the front of one of the upper connecting rod and the lower connecting rod of the collector, and the other end of the connecting rod spring is connected to the lower part of the other of the upper connecting rod and the lower connecting rod of the collector.

[0015] Optionally, in the power supply device of the wind turbine pitch bearing crack monitoring system described above, the upper connecting rod and the lower connecting rod of the current collector are respectively connected to the connecting rod fixing plate through connecting rod fixing pins.

[0016] Optionally, in the power supply device of the wind turbine pitch bearing crack monitoring system described above, the current collector further includes a fixing bolt and a fixing nut;

[0017] The head of the fixing bolt is connected to the magnetic fixing base, or the magnetic fixing base constitutes the head of the fixing bolt.

[0018] The tail of the fixing bolt passes through the connecting rod fixing plate and is fastened by the fixing nut.

[0019] Optionally, in the power supply device of the wind turbine pitch bearing crack monitoring system described above, an insulated wire fixing bracket is installed on the brush head fixing plate, and the wire fixing bracket is connected to the insulated wire.

[0020] Optionally, in the power supply device of the wind turbine pitch bearing crack monitoring system described above, the power switch and the electrical control cabinet are located inside the blades of the wind turbine.

[0021] And / or, the fixed end of the current collector is mounted on the hub of the wind turbine.

[0022] Optionally, in the power supply device of the wind turbine pitch bearing crack monitoring system, each pitch bearing is provided with three conductive rails and two current collectors, and the insulated wires of the two current collectors are respectively connected to the positive and negative terminals of the power switch output terminal.

[0023] This utility model provides a power supply device for a wind turbine pitch bearing crack monitoring system, which has the following advantages:

[0024] By mounting a conductive rail on the surface of the wind turbine pitch bearing, and having the collector brush head of the current collector slide in contact with the conductive rail, AC power from the electrical control cabinet is converted to DC power by a power switch. This DC power then flows sequentially through insulated wires and the collector brush head to the conductive rail, ultimately supplying the power directly to the pitch bearing crack monitoring system. With the pitch bearing as a rotating component and the collector brush head as a stationary component, the combination of the conductive rail and the collector brush head enables continuous power supply between the rotating and stationary components. The power switch and electrical control cabinet ensure reliable power delivery, effectively solving the technical challenge of unstable battery power supply in the wind turbine pitch bearing crack monitoring system.

[0025] In addition, insulated wire fixing brackets are used to fix the insulated wire passing through the top of the current collector to prevent wear and mechanical damage caused by the insulated wire swinging at will.

[0026] The brush head fixing plate is hinged to the current collector brush plate, which allows the current collector to rotate freely and ensures flexible contact when the current collector brush head moves relative to the conductive rail. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figures 1-2 A schematic diagram of the connection between the power supply device and the pitch bearing of a wind turbine pitch bearing crack monitoring system provided in this embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the structure of a current collector provided in an embodiment of this utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the conductive rail assembly provided in an embodiment of the present utility model;

[0031] Figure 5 A schematic diagram of the structure of the switching power supply provided in an embodiment of this utility model.

[0032] In the image above:

[0033] 100 - Conductive rail assembly; 110 - Conductive rail; 120 - Water-blocking protrusion; 130 - Water guide channel;

[0034] 200-Power switch;

[0035] 300-Current collector; 310-Current collector brush head; 320-Current collector brush plate; 330-Insulated wire; 340-Brush head rotating shaft; 350-Insulated wire fixing bracket; 360-Brush head fixing plate; 370-Current collector upper connecting rod; 380-Current collector lower connecting rod; 390-Connecting rod spring;

[0036] 3100 - Linkage fixing plate; 3111 - Fixing bolt; 3112 - Fixing nut; 3113 - Washer; 3120 - Linkage fixing pin; 3130 - Magnetic fixing base;

[0037] 400 - Electrical control cabinet. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] The core of this utility model is to provide a power supply device for a wind turbine pitch bearing crack monitoring system, which can ensure good power supply through AC and DC power supply.

[0040] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] For details, please refer to Figures 1-5 The present invention provides a power supply device for a wind turbine pitch bearing crack monitoring system, comprising: a conductive rail assembly 100, several current collectors 300, a power switch 200, and an electrical control cabinet 400.

[0042] The conductive rail assembly 100 is arranged circumferentially around the pitch bearing. The conductive rail assembly 100 includes multiple conductive rails 110, each of which contains a conductor. It should be noted that the conductive rails 110 are installed on the surface of the wind turbine pitch bearing. Two conductive rails 110 are respectively connected to the positive and negative terminals of a DC power supply to provide DC power to the blade pitch bearing crack monitoring device. This DC power comes from the power switch 200 and the electrical control cabinet 400.

[0043] Each current collector 300 includes a current collector brush head 310, a current collector brush plate 320, an insulated wire 330, and a brush head fixing plate 360.

[0044] One end of the current collector brush plate 320 is connected to the current collector brush head 310, and the other end is connected to one end of the insulated wire 330. The current collector brush plate 320 is used to fix the current collector brush head 310, and the insulated wire 330 can be pre-embedded in the current collector brush plate 320 to achieve a stable connection at the end of the insulated wire 330.

[0045] The brush head fixing plate 360 ​​is rotatably connected to the current collector brush plate 320. Specifically, the brush head fixing plate 360 ​​is hinged to the current collector brush plate 320 via the brush head rotation shaft 340. The brush head fixing plate 360 ​​is connected to the current collector brush plate 320 via the brush head rotation shaft 340, enabling the current collector to rotate freely and ensuring flexible contact between the current collector brush head 310 and the conductive rail 110 during relative movement.

[0046] The current collector brush head 310 is used to slide in contact with the conductive rail 110 and to supply power to the conductive rail 110.

[0047] Specifically, both the conductive rail 110 and the current collector brush head 310 are made of conductive materials. Specifically, the conductive rail 110 can be made of copper, and the current collector brush head 310 can also be made of copper.

[0048] The input terminal of power switch 200 is connected to electrical control cabinet 400, and the output terminal of power switch 200 is connected to the other end of the insulated wire 330 of each current collector 300. It should be noted that power switch 200 is specifically a 220VAC to 3.7VDC switching power supply, converting 220VAC power (AC 220V power supply) to 3.7VDC (DC 3.7V power supply) for use by the pitch bearing crack monitoring system.

[0049] It should be noted that this solution uses a current collector 300, a power switch 200, and an electrical control cabinet 400 to replace the battery in the existing technology. Power supply and electrical signal transmission between relatively moving parts are achieved through the cooperation of the conductive rail 110 and the current collector brush head 310. The wind turbine pitch bearing crack monitoring system is existing technology; its specific structure and working principle will not be elaborated here. The pitch bearing is a rotating component that rotates with the blades, while the hub is relatively stationary. The fixed end of the current collector 300 can be connected to the hub.

[0050] This utility model provides a power supply device for a wind turbine pitch bearing crack monitoring system. A conductive rail 110 is mounted on the surface of the wind turbine pitch bearing. The current collector brush head 310 of the current collector 300 slides in contact with the conductive rail 110. Alternating current from the electrical control cabinet 400 is converted to direct current by a power switch 200 and then supplies power to the conductive rail 110 sequentially through an insulated wire 330 and the current collector brush head 310. The pitch bearing is a rotating component, and the current collector brush head 310 is a stationary component. The combination of the conductive rail 110 and the current collector brush head 310 enables continuous power supply between the rotating and stationary components. The power switch 200 and the electrical control cabinet 400 ensure a reliable power supply, effectively solving the technical problem of unstable battery power supply in wind turbine pitch bearing crack monitoring systems.

[0051] To prevent rainwater from causing short circuits between the positive and negative terminals of the conductive rail assembly 100, in a specific embodiment, the conductive rail assembly 100 includes multiple conductive rails 110. At least one side of each conductive rail 110 is provided with a water-blocking protrusion 120 and / or a water-guiding groove 130. See details... Figure 4 The water-blocking protrusion 120 and the water-guiding channel 130 can effectively guide the flow of rainwater and prevent it from accumulating on the conductive rail assembly 100, thereby reducing the risk of short circuit.

[0052] Specifically, the water guide channel 130 can be installed on both sides or below the conductive rail to collect and guide rainwater to a safe area. Water-blocking protrusions can be installed at the edges of each conductive rail 110 to prevent rainwater from splashing directly onto the surface of the conductive rail 110, significantly improving the system's waterproof performance.

[0053] In addition, a waterproof coating can be applied to the conductive rail 110 to further enhance its waterproof performance. This ensures that the conductive rail 110 can function normally even in severe weather conditions, avoiding safety hazards caused by short circuits.

[0054] Each current collector 300 also includes a magnetic mounting base 3130, which is connected to the brush head mounting plate 360 ​​and is used to fix the entire current collector part to the mounting part of the wind turbine by magnetic attraction. It should be noted that the magnetic mounting base 3130 is a strong magnet with sufficiently strong magnetic force to attract to the cast iron hub or other mounting parts of the wind turbine, thereby reliably mounting the current collector brush assembly on the pitch bearing surface.

[0055] Based on the above specific embodiments, such as Figure 3 As shown, the current collector 300 also includes a tension mechanism, which includes an upper connecting rod 370, a lower connecting rod 380, a connecting rod spring 390, and a connecting rod fixing plate 3100. The front ends of the upper connecting rod 370 and the lower connecting rod 380 are respectively hinged to the brush head fixing plate 360, and the rear ends of the upper connecting rod 370 and the lower connecting rod 380 are respectively hinged to the connecting rod fixing plate 3100. The two ends of the connecting rod spring 390 are respectively connected to the upper connecting rod 370 and the lower connecting rod 380.

[0056] Each current collector connecting rod is connected via a brush head fixing plate 360. The connecting rod fixing plate 3100 is used to fix the upper current collector connecting rod 370 and the lower current collector connecting rod 380, and also to install the magnetic fixing base 3130. The upper current collector connecting rod 370, the lower current collector connecting rod 380, and the connecting rod spring 390, after being adjusted to an appropriate position, can provide a certain contact pressure to the current collector brush head 310 and the conductive rail 110, ensuring reliable conductivity.

[0057] The hinged arrangement at the ends of the upper connecting rod 370 and the lower connecting rod 380 of the current collector allows the current collector brush head 310 to change angle. This helps the current collector brush head 310 adapt to changes in the movement of the equipment, while the elastic force of the connecting rod spring 390 provides constant tension.

[0058] By designing the upper connecting rod 370, lower connecting rod 380, and connecting rod spring 390 of the current collector, in conjunction with a strong magnetic attraction device, sufficient contact pressure is ensured between the conductive rail 110 and the current collector brush head 310. This tension mechanism determines the sliding contact pressure between the current collector brush head 310 and the conductive rail 110, as well as the stability of the mechanism. The current collector brush head 310 is the conductor through which the conductive rail 110 slides to pick up electrical energy; its performance and conductivity directly affect the safe operation of the entire system.

[0059] Specifically, the upper connecting rod 370 and the lower connecting rod 380 of the current collector are arranged in parallel to ensure that the brush head fixing plate 360 ​​is subjected to uniform force during movement, thereby improving the stability and reliability of the system. One end of the connecting rod spring 390 is connected to the front of one of the upper connecting rod 370 and the lower connecting rod 380 of the current collector, and the other end of the connecting rod spring 390 is connected to the lower part of the other of the upper connecting rod 370 and the lower connecting rod 380 of the current collector. Through the specific spring connection position, the structural balance of the entire tension mechanism is enhanced, and vibration and swaying during movement are reduced, thereby achieving more precise tension adjustment and ensuring that the contact surface between the current collector brush head 310 and the conductive rail 110 maintains optimal contact pressure.

[0060] In a specific embodiment, the current collector 300 further includes a fixing bolt 3111 and a fixing nut 3112. The head of the fixing bolt 3111 is connected to the magnetic fixing base 3130, or the magnetic fixing base 3130 constitutes the head of the fixing bolt 3111.

[0061] The tail of the fixing bolt 3111 passes through the connecting rod fixing plate 3100 and is tightened by the fixing nut 3112, thereby fixing the magnetic fixing base 3130 onto the connecting rod fixing plate 3100.

[0062] Of course, a washer 3113, such as a flat washer or a spring washer, can also be placed at the end of the fixing bolt 3111 between the connecting rod fixing plate 3100 and the fixing nut 3112.

[0063] To prevent the insulated wire 330 from swinging freely, an insulated wire fixing bracket 350 is installed on the brush head fixing plate 360, and the wire fixing bracket 350 is connected to the insulated wire 330.

[0064] One end of the insulated wire holder 350 is connected to the brush head holder 360, and the other end is connected to the insulated wire 330. The insulated wire holder 350 is used to fix the insulated wire 330 passing through the upper end of the current collector 300, preventing wear and mechanical damage caused by the insulated wire 330 swinging freely.

[0065] In a specific embodiment, the power switch 200 and the electrical control cabinet 400 are located inside the blades of the wind turbine, so that the power switch 200 and the electrical control cabinet 400 are close to the conductive rail 110 of the blades. This can shorten the current transmission path, reduce resistance and energy loss, and improve the efficiency of power transmission.

[0066] The fixed end of the current collector 300 is installed on the hub of the wind turbine, which can ensure a stable power connection and avoid loosening of the electrical connection due to mechanical vibration.

[0067] The above configuration optimizes power transmission efficiency, improves system reliability and security, achieves a compact and integrated design, and also provides good maintainability and environmental adaptability. These advantages enable wind turbines to operate efficiently and stably in various complex environments.

[0068] like Figure 1 As shown, the number of pitch bearings can be one, and there are two current collectors 300 on each pitch bearing. The insulated wires 330 of the two current collectors 300 are respectively connected to the positive and negative terminals of the output terminal of the power switch 200.

[0069] like Figure 2 As shown, there are multiple pitch bearings, and each pitch bearing has two current collectors 300. The insulated wires 330 of the two current collectors 300 on each pitch bearing are respectively connected to the positive and negative terminals of the output terminal of the power switch 200.

[0070] At least two conductive rails 110 are provided on each pitch bearing. Of course, three conductive rails 110 or even more can be provided. Even if one of the conductive rails 110 fails, the other two can still maintain power transmission to ensure normal operation.

[0071] The beneficial effects of the technical solution provided by this utility model include:

[0072] 1. Improve the operational stability of the wind turbine pitch bearing crack monitoring system: address the issue of poor power supply reliability in the wind turbine pitch bearing crack monitoring system, which leads to a high equipment failure rate, and improve the operational stability of the wind turbine pitch bearing crack monitoring system.

[0073] 2. The power supply device of the wind turbine pitch bearing crack monitoring system has low manufacturing cost: except for a few tooling components that are independently designed, most tooling components use common parts, resulting in low overall manufacturing cost;

[0074] 3. The power supply device of the wind turbine pitch bearing crack monitoring system has a wide range of applications: When there is a need to achieve power supply or electrical signal transmission between two relatively moving parts in the operation of the wind turbine, the device can be adapted to the scenario with slight adjustments.

[0075] 4. Reduced labor intensity: Previously, the pitch bearing crack monitoring system was powered by a battery, which needed to be replaced periodically after a certain period of time. Due to the poor power supply stability, the failure rate of the monitoring system was high, and wind turbine operators had to climb the tower to handle the problem, which was labor-intensive and frequent. With this design, the pitch bearing crack monitoring device can be powered online with good power supply stability, which greatly frees up the productivity of on-site personnel.

[0076] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0077] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0079] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A power supply device for a wind turbine pitch bearing crack monitoring system, characterized in that, It includes a conductive rail assembly (100), several current collectors (300), a power switch (200), and an electrical control cabinet (400). The conductive rail assembly (100) is arranged circumferentially around the pitch bearing. The conductive rail assembly (100) includes multiple conductive rails (110), and each conductive rail (110) contains a conductor. Each of the current collectors (300) includes a current collector brush head (310), a current collector brush plate (320), an insulated wire (330), and a brush head fixing plate (360). One end of the current collector brush plate (320) is connected to the current collector brush head (310), and the other end is connected to one end of the insulated wire (330). The brush head fixing plate (360) is rotatably connected to the current collector brush plate (320). The current collector brush head (310) is used to slide in contact with the conductive rail (110) and supply power to the conductive rail (110). The input terminal of the power switch (200) is connected to the electrical control cabinet (400), and the output terminal of the power switch (200) is connected to the other end of the insulated wire (330) of each current collector (300).

2. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 1, characterized in that, The conductive rail (110) is provided with a water-blocking protrusion (120) and / or a water-guiding groove (130) on at least one side.

3. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 1 or 2, characterized in that, The current collector (300) also includes a magnetic fixing base (3130), which is connected to the brush head fixing plate (360) and is used for magnetic connection of the fixing components of the wind turbine.

4. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 3, characterized in that, The current collector (300) also includes a tension mechanism, which includes an upper connecting rod (370), a lower connecting rod (380), a connecting rod spring (390), and a connecting rod fixing plate (3100). The front ends of the upper connecting rod (370) and the lower connecting rod (380) are respectively hinged to the brush head fixing plate (360), and the rear ends of the upper connecting rod (370) and the lower connecting rod (380) are respectively hinged to the connecting rod fixing plate (3100). The two ends of the connecting rod spring (390) are respectively connected to the upper connecting rod (370) and the lower connecting rod (380).

5. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 4, characterized in that, The upper connecting rod (370) and the lower connecting rod (380) of the current collector are arranged in parallel. One end of the connecting rod spring (390) is connected to the front of one of the upper connecting rod (370) and the lower connecting rod (380), and the other end of the connecting rod spring (390) is connected to the lower part of the other of the upper connecting rod (370) and the lower connecting rod (380).

6. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 4, characterized in that, The upper connecting rod (370) and the lower connecting rod (380) of the current collector are respectively connected to the connecting rod fixing plate (3100) through connecting rod fixing pins (3120).

7. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 4, characterized in that, The current collector (300) also includes a fixing bolt (3111) and a fixing nut (3112). The head of the fixing bolt (3111) is connected to the magnetic fixing base (3130), or the magnetic fixing base (3130) constitutes the head of the fixing bolt (3111). The tail of the fixing bolt (3111) passes through the connecting rod fixing plate (3100) and is fastened by the fixing nut (3112).

8. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 1, characterized in that, An insulated wire fixing bracket (350) is installed on the brush head fixing plate (360), and the wire fixing bracket (350) is connected to the insulated wire (330).

9. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 1, characterized in that, The power switch (200) and the electrical control cabinet (400) are located inside the blades of the wind turbine. And / or, the fixed end of the current collector (300) is mounted on the hub of the wind turbine.

10. The power supply device for the wind turbine pitch bearing crack monitoring system according to claim 1, characterized in that, Each of the pitch bearings is provided with three conductive rails (110) and two current collectors (300). The insulated wires (330) of the two current collectors (300) are respectively connected to the positive and negative terminals of the output terminal of the power switch (200).

Images