Variable pitch bearing bolt monitoring system
By installing strain line and strain gauge sensor modules in the wind turbine, the connection status of the pitch bearing bolts is monitored, and the prevention problem of pitch bearing bolts is solved, and the safe operation of the wind turbine is achieved.
Patent Information
- Application Number
- CN202420938565.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-30
AI Technical Summary
Breakage of pitch bearing bolts may lead to wind turbine blades falling off and equipment damage, and it is difficult for the prior art to effectively monitor and prevent such accidents.
A pitch bearing bolt monitoring system is designed, including strain line, strain gauge sensor module and central controller. By monitoring the connection status of the strain line in real time, determining whether the bolt is broken, and controlling the wind turbine shutdown through wireless communication.
Timely detection and early warning of the breakage of the pitch bearing bolts is achieved, the risk of accidents is reduced, and the safe operation of the wind turbine is ensured.
Smart Images
Figure CN222254216U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wind power generation, in particular to a variable pitch bearing bolt monitoring system. Background Art
[0002] The pitch system is a key component of wind turbines, allowing the blades to adjust their angles to maximize energy capture and protect the rotor from damage due to excessive wind speeds.
[0003] The pitch system is mainly composed of a pitch motor, a gearbox, a toothed belt pulley tensioner or a driving gear. The pitch motor provides power, adjusts the speed through a reducer, and drives the pitch bearing to rotate through a toothed belt or a large gear to adjust the blade angle. The bolts of the pitch bearing are used to fix the wind turbine blades and the hub. If the bolts break due to insufficient design strength, material fatigue or other reasons, it may cause the blades to fall off or even damage the equipment.
[0004] Therefore, how to effectively monitor the pitch bearing bolts has become an important means to reduce the risk of pitch bolt fracture accidents. Utility Model Content
[0005] In view of the above problems, the utility model provides a variable pitch bearing bolt monitoring system that overcomes the above problems or at least partially solves the above problems. The technical solution is as follows:
[0006] A variable pitch bearing bolt monitoring system, comprising: a strain line 02, a strain gauge sensor module 03 and a central controller 04, wherein the strain line 02 is installed on a target bolt 01 of a variable pitch bearing in a wind turbine generator set, and the strain line 02 is connected to the strain gauge sensor module 03 to form a bolt monitoring loop of the variable pitch bearing; the strain gauge sensor module 03 is connected to the central controller 04;
[0007] The strain gauge sensor module 03 is used to output a bolt monitoring signal to the central controller 04 according to the connectivity status of the strain wire 02;
[0008] The central controller 04 is used to determine whether the target bolt 01 of the variable pitch bearing is broken based on the received bolt monitoring signal, and obtain the blade state monitoring result of the variable pitch bearing.
[0009] Optionally, the central controller 04 is also used to control the wind turbine set according to the propeller status monitoring result.
[0010] Optionally, the central controller 04 includes a master-side control unit 041 and a slave-side control unit 042, the master-side control unit 041 and the slave-side control unit 042 are connected via wireless communication, the master-side control unit 041 is connected to the strain gauge sensor module 03, and the slave-side control unit 042 is connected to the cabin control cabinet 05 of the wind turbine generator set;
[0011] The master-side control unit 041 is used to receive the bolt monitoring signal output by the strain gauge sensor module 03, determine whether the target bolt 01 of the pitch bearing is broken, obtain the propeller state monitoring result of the pitch bearing, and transmit the propeller state monitoring result to the slave-side control unit 042;
[0012] The slave-side control unit 042 is used to receive the propeller status monitoring result transmitted by the master-side control unit 041, and control the on and off of the shutdown signal of the cabin control cabinet 05 according to the propeller status monitoring result.
[0013] Optionally, the master-side control unit 041 includes a first controller 0411 and a first IO pin row expansion board 0412, the first IO pin row expansion board 0412 is crimped onto the first controller 0411 through pins, a first interface of the first IO pin row expansion board 0412 is connected to the strain gauge sensor module 03, and a second interface of the first IO pin row expansion board 0412 is connected to a propeller status indicator light of the pitch bearing;
[0014] The first controller 0411 is used to receive the bolt monitoring signal output by the strain gauge sensor module 03 through the first interface, control the propeller status indicator light through the second interface according to the propeller status monitoring result, and transmit the propeller status monitoring result to the slave side control unit 042 through the wireless communication method.
[0015] Optionally, the slave-side control unit 042 includes a second controller 0421 and a second IO pin extension board 0422, the second IO pin extension board 0422 is crimped onto the second controller 0421 via pins, a third interface of the second IO pin extension board 0422 is connected to a digital relay module of the cabin control cabinet 05, and the digital relay module controls the shutdown signal external circuit of the wind turbine set via a normally closed contact;
[0016] The second controller 0421 is used to receive the propeller status monitoring result transmitted by the main side control unit 041, and output a control signal corresponding to the propeller status monitoring result to the digital relay module, so that the digital relay module controls the on and off of the shutdown signal of the shutdown signal external circuit through the normally closed contact according to the control signal.
[0017] Optionally, the target bolts 01 include a preset number of bolts continuously at the pitch bearing at the 0° position and the 180° position.
[0018] Optionally, the preset number is 10.
[0019] Optionally, the wireless communication method is Bluetooth communication.
[0020] Optionally, the strain wire 02 is installed on the target bolt 01 of the pitch bearing by bonding or magnetic attraction.
[0021] Optionally, the master-side control unit 041 is mounted on a hub connected to the pitch bearing, and the slave-side control unit 042 is mounted on a slip ring bracket of the wind turbine generator set.
[0022] By means of the above technical scheme, the utility model provides a variable pitch bearing bolt monitoring system, which includes: a strain line 02, a strain gauge sensor module 03 and a central controller 04, wherein the strain line 02 is installed on the target bolt 01 of the variable pitch bearing in the wind turbine, and the strain line 02 is connected to the strain gauge sensor module 03 to form a bolt monitoring circuit of the variable pitch bearing; the strain gauge sensor module 03 is connected to the central controller 04; the strain gauge sensor module 03 is used to output a bolt monitoring signal to the central controller 04 according to the connectivity state of the strain line 02; the central controller 04 is used to determine whether the target bolt 01 of the variable pitch bearing is broken according to the received bolt monitoring signal, and obtain the paddle state monitoring result of the variable pitch bearing. The utility model can timely and effectively discover the fracture of the variable pitch bearing bolt by real-time monitoring the connectivity state of the strain line 02 installed on the target bolt 01 of the variable pitch bearing in the wind turbine, thereby helping to reduce the risk of the variable pitch bolt fracture accident.
[0023] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0025] Figure 1A schematic diagram of the system structure of a variable pitch bearing bolt monitoring system provided by an embodiment of the utility model is shown;
[0026] Figure 2 A connection schematic diagram of a bolt monitoring circuit provided by an embodiment of the utility model is shown;
[0027] Figure 3 Another schematic diagram of the system structure of the variable pitch bearing bolt monitoring system provided by the embodiment of the utility model is shown;
[0028] Figure 4 Another schematic diagram of the system structure of the variable pitch bearing bolt monitoring system provided by an embodiment of the utility model is shown;
[0029] Figure 5 A schematic diagram of the structure of a master-side control unit provided by an embodiment of the utility model is shown;
[0030] Figure 6 A schematic diagram of the structure of a slave-side control unit provided by an embodiment of the utility model is shown;
[0031] Figure 7 A circuit connection diagram of a digital relay module provided by an embodiment of the utility model is shown. DETAILED DESCRIPTION
[0032] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.
[0033] Wind turbine, the full name is wind turbine generator set. Wind turbines can be divided into variable pitch control wind turbines, fixed speed wind turbines, variable speed wind turbines, direct drive (gearless) wind turbines and doubly fed wind turbines according to their types. The variable pitch system of a wind turbine usually includes a variable pitch motor, which is the power source, and its output speed is adjusted through a reducer. The reducer transmits power to a toothed belt pulley tensioner or a drive gear, which is connected to the variable pitch bearing, thereby driving the blades to rotate to adjust their angles. The blades are connected to the hub through the variable pitch bearing. The hub is further connected to the main shaft of the transmission system or the outer ring of the generator. The hub is in the middle of the connection between the three blades of the wind turbine. The rotating part of the variable pitch bearing is connected to the blades, and the relatively static part is connected to the hub. Driven by the three blades, the hub rotates continuously along its own center line. In this way, the impeller can convert wind energy into mechanical energy, and finally realize the conversion of mechanical energy into electrical energy through the generator.
[0034] Pitch bearing bolts are used to fix wind turbine blades and hubs, and are key components to ensure stable operation of blades. If the bolts break due to insufficient design strength, material fatigue or other reasons, it may cause blades to fall off or damage the internal equipment of the hub.
[0035] In order to reduce the risk of pitch bolt fracture accidents in wind turbines, an embodiment of the utility model provides a pitch bearing bolt monitoring system, which determines whether the target bolt 01 of the pitch bearing is broken by real-time monitoring of the connectivity status of the strain line 02 on the target bolt 01 installed in the pitch bearing of the wind turbine, thereby facilitating timely control of the wind turbine shutdown and preventing the accident from expanding.
[0036] like Figure 1 As shown, a system structure schematic diagram of the variable pitch bearing bolt monitoring system provided by an embodiment of the utility model may include: a strain wire 02, a strain gauge sensor module 03 and a central controller 04, the strain wire 02 is installed on the target bolt 01 of the variable pitch bearing in the wind turbine generator set, the strain wire 02 is connected to the strain gauge sensor module 03 to form a bolt monitoring circuit of the variable pitch bearing; the strain gauge sensor module 03 is connected to the central controller 04.
[0037] The strain wire 02 is a very thin cable attached to the target bolt 01 of the pitch bearing. When the target bolt 01 breaks, the strain wire 02 attached to the target bolt 01 will be torn off, so that the bolt monitoring circuit is disconnected.
[0038] Optionally, the strain wire 02 is mounted on the target bolt 01 of the pitch bearing by bonding or magnetic attraction.
[0039] Optionally, the target bolts 01 include a preset number of bolts continuously arranged at the 0° position and the 180° position of the pitch bearing. Optionally, the preset number is 10.
[0040] The strain gauge sensor module 03 is used to output a bolt monitoring signal to the central controller 04 according to the connectivity status of the strain line 02 .
[0041] Optionally, the strain gauge sensor module 03 may be a single-bridge strain gauge sensor module.
[0042] like Figure 2As shown, a connection schematic diagram of the bolt monitoring circuit provided by an embodiment of the utility model. The first module interface 031 of the strain gauge sensor module 03 is connected to the second module interface 032 via a strain line 02, forming a bolt monitoring circuit for a variable pitch bearing. The strain gauge sensor module 03 can supply power to the central controller 04 via the first VCC terminal 033 and the first GND terminal 034, and the power supply voltage is 5VDC (Volts Direct Current). At the same time, the strain gauge sensor module 03 is connected to the central controller 04 via the first OUT terminal 035, and a bolt monitoring signal is output via the OUT terminal.
[0043] When the target bolt 01 is normal, the strain line 02 between the first module interface 031 and the second module interface 032 of the strain gauge sensor module 03 is in a conductive state, which reflects that the target bolt 01 is not broken. The bolt monitoring signal output from the first OUT terminal 035 of the strain gauge sensor module 03 to the central controller 04 is a 5VDC signal.
[0044] When the target bolt 01 is in a fault state, the strain line 02 between the first module interface 031 and the second module interface 032 of the strain gauge sensor module 03 is in a disconnected state, which reflects that the target bolt 01 is broken and detached. The bolt monitoring signal outputted from the first OUT terminal 035 of the strain gauge sensor module 03 to the central controller 04 is a 0VDC signal.
[0045] Under normal circumstances, the variable pitch system of a wind turbine usually includes three blades, each blade is independently monitored by a variable pitch bearing bolt monitoring sensor composed of a set of strain wires 02 and strain gauge sensor modules 03, and is uniformly processed by a central controller 04.
[0046] Optional, Figure 3 The figure shows another system structure schematic diagram of the variable pitch bearing bolt monitoring system provided by an embodiment of the utility model, which may include three strain gauge sensor modules 03 , three monitoring strain lines 02 and a central controller 04 .
[0047] The central controller 04 is used to determine whether the target bolt 01 of the variable pitch bearing is broken based on the received bolt monitoring signal, and obtain the propeller state monitoring result of the variable pitch bearing.
[0048] Optionally, the central controller 04 may be a single-chip microcomputer based on an Arduino platform, or a single-chip microcomputer based on a Raspberry Pi platform, an ESP8266 / ESP32 platform, or an STM32 platform.
[0049] The central controller 04 can be specifically used to determine that the target bolt 01 of the variable pitch bearing is not broken when the single-bridge strain gauge sensor module 03 transmits a 5VDC signal, and obtain the paddle state monitoring result of the variable pitch bearing as normal. The central controller 04 can be specifically used to determine that the target bolt 01 of the variable pitch bearing is broken when the single-bridge strain gauge sensor module 03 transmits a 0VDC signal, and obtain the paddle state monitoring result of the variable pitch bearing as fault.
[0050] Optionally, the central controller 04 is also used to control the wind turbine according to the propeller status monitoring result.
[0051] Specifically, the central controller 04 can be used to control the wind turbine to continue to operate when the propeller status monitoring result is normal, and to control the wind turbine to shut down when the propeller status monitoring result is a fault.
[0052] The utility model analyzes and judges the real-time propeller status monitoring results through the central controller 04. When the propeller status monitoring result of the variable pitch bearing of any propeller blade of the wind turbine is a fault, the wind turbine can be promptly controlled to shut down, thereby reducing the probability of blade shedding or internal equipment damage in the hub.
[0053] Optional, based on Figure 1 The system shown, Figure 4 As shown, another system structure schematic diagram of the variable pitch bearing bolt monitoring system provided by an embodiment of the utility model, the central controller 04 may include a master-side control unit 041 and a slave-side control unit 042, the master-side control unit 041 and the slave-side control unit 042 are connected via wireless communication, the master-side control unit 041 is connected to the strain gauge sensor module 03, and the slave-side control unit 042 is connected to the cabin control cabinet 05 of the wind turbine set.
[0054] Among them, the cabin control cabinet 05 refers to the component responsible for the control and management of the entire wind turbine. The cabin control cabinet 05 mainly includes electrical equipment and systems for monitoring, controlling and protecting various components of the wind turbine. The cabin control cabinet 05 may include an industrial automation control component 055 for controlling the wind turbine and a digital relay module for realizing fault shutdown control of the wind turbine. The industrial automation control component 055 is connected to the digital relay module. The industrial automation control component 055 can be an automation control product based on a programmable logic controller (PLC). Optionally, the industrial automation control component 055 can be a Beckhoff control module or a Bachmann control module.
[0055] Optionally, the main-side control unit 041 is mounted on a hub connected to the pitch bearing.
[0056] Specifically, the main-side control unit 041 can be fastened using bolts and nuts, and the main-side control unit 041 can be installed on the side of the blade control cabinet by drilling holes on the side of the blade control cabinet on the hub connected to the pitch bearing.
[0057] Optionally, the slave-side control unit 042 is mounted on a slip ring bracket of the wind turbine generator set.
[0058] Specifically, four special magnets are installed on the base of the slave-side control unit 042, and the slave-side control unit 042 is adsorbed on the slip ring bracket of the wind turbine generator set by fastening with a screw and a nut.
[0059] The hardware configurations of the master-side control unit 041 and the slave-side control unit 042 are the same, and both may include a controller, an IO pin expansion board, a power supply interface, and a data interface. The power supply interface and the data interface are installed on the controller.
[0060] Optionally, the power supply interface can be connected to a dedicated 220VAC power adapter to provide external power supply with a power supply voltage of 7VDC to 12VDC.
[0061] Optionally, the data interface can be a Micro USB data interface or a USB Type-C data interface. The data interface can be used to transmit data during programming and can also be connected to a maintenance computer at a later stage.
[0062] Optionally, the controller may be an Arduino single-board microcontroller. The IO pin header expansion board is crimped onto the Arduino single-board microcontroller through pins.
[0063] Preferably, the controller may be a Bluno motherboard controller. The Bluno motherboard controller integrates the Arduino UNO development board and Bluetooth 4.0 (also known as Bluetooth Low Energy or BLE) technology, has a rich set of peripherals and general IO ports, is not only fully compatible with the traditional Arduino platform, but also has the functions of wireless program download and remote program update.
[0064] Optionally, the wireless communication method is Bluetooth communication. The master-side control unit 041 and the slave-side control unit 042 are connected via Bluetooth communication, which can avoid the limitation of the deployment position of the master-side control unit 041 and the slave-side control unit 042 by wired connection, and at the same time does not rely on any local area network or external network. Using Bluetooth can easily communicate between controllers, which is more suitable for the actual application scenario of wind turbines.
[0065] The master-side control unit 041 is used to receive the bolt monitoring signal output by the strain gauge sensor module 03, determine whether the target bolt 01 of the variable pitch bearing is broken, obtain the propeller state monitoring result of the variable pitch bearing, and transmit the propeller state monitoring result to the slave-side control unit 042.
[0066] The main-side control unit 041 can be specifically used to determine that the target bolt 01 of the variable pitch bearing is not broken when the single-bridge strain gauge sensor module 03 transmits a 5VDC signal, and obtain the paddle state monitoring result of the variable pitch bearing as normal. The main-side control unit 041 can be specifically used to determine that the target bolt 01 of the variable pitch bearing is broken when the single-bridge strain gauge sensor module 03 transmits a 0VDC signal, and obtain the paddle state monitoring result of the variable pitch bearing as fault.
[0067] The slave-side control unit 042 is used to receive the propeller status monitoring result transmitted by the master-side control unit 041, and control the on and off of the shutdown signal of the cabin control cabinet 05 according to the propeller status monitoring result.
[0068] Specifically, the slave control unit 042 can be used to control the shutdown signal of the cabin control cabinet 05 to be connected when the propeller status monitoring result is normal, so as to keep the wind turbine running continuously. When the propeller status monitoring result is a fault, the shutdown signal of the cabin control cabinet 05 is disconnected to control the wind turbine to shut down.
[0069] Optionally, the main side control unit 041 includes a first controller 0411 and a first IO pin row expansion board 0412, the first IO pin row expansion board 0412 is crimped onto the first controller 0411 through pins, the first interface of the first IO pin row expansion board 0412 is connected to the strain gauge sensor module 03, and the second interface of the first IO pin row expansion board 0412 is connected to the propeller status indicator light of the variable pitch bearing.
[0070] The first controller 0411 is used to receive the bolt monitoring signal output by the strain gauge sensor module 03 through the first interface, control the propeller status indicator light through the second interface according to the propeller status monitoring result, and transmit the propeller status monitoring result to the slave side control unit 042 through wireless communication.
[0071] like Figure 5As shown, a structural schematic diagram of the main side control unit 041 provided by the embodiment of the utility model, taking a wind turbine with three blades as an example, the first controller 0411 is installed with a first power supply interface 0413 and a first data interface 0414, and the first IO pin header expansion board 0412 is crimped on the first controller 0411 through pins. There are 7 groups of first cable interfaces 0415 on the first IO pin header expansion board 0412, which are respectively used for the control board power indicator light, the No. 1 propeller status indicator light, the No. 2 propeller status indicator light, the No. 3 propeller status indicator light, the No. 1 propeller strain sensor power supply and signal feedback, the No. 2 propeller strain sensor power supply and signal feedback, and the No. 3 propeller strain sensor power supply and signal feedback.
[0072] Optionally, for the variable pitch bearing bolt status monitoring, three-blade monitoring unit cyclic detection, indicator light display and fault status alarm functions implemented by the first controller 0411, the monitoring variables can be assigned or pins can be specified as shown in Table 1, and then the pin mode can be set and the transmission baud rate can be determined as shown in Table 2, and then the cyclic detection mode can be set as shown in Table 3 (taking variable pitch bearing No. 1 of the wind turbine as an example), and finally the monitoring status output program can be written as shown in Table 4 (taking variable pitch bearing No. 1 of the wind turbine as an example).
[0073] Table 1
[0074] Variable Name Program meaning int OK_pin = 13 Set device OK to pin 13 int sensor1_pin = 4 Set the axis 1 strain line state to pin 4 int sensor2_pin=5 Set the axis 2 strain line state to pin 5 int sensor3_pin=6 Set the axis 3 strain line state to pin 6 int A1_pin = 10 Set the axis 1 strain gauge warning light to pin 10 int A2_pin = 11 Set the axis 2 strain wire alarm light to pin 11 int A3_pin = 12 Set the axis 3 strain wire alarm light to pin 12 int par1 = 0 Set the initial value of sensor 1-4 pins to 0 int par2 = 0 Set the initial value of sensor2-5 pins to 0 int par3 = 0 Set the initial value of sensor3-6 pins to 0
[0075] Table 2
[0076]
[0077]
[0078] Table 3
[0079]
[0080] Table 4
[0081]
[0082]
[0083] Optionally, the slave side control unit 042 includes a second controller 0421 and a second IO pin expansion board 0422, the second IO pin expansion board 0422 is crimped onto the second controller 0421 through pins, and the third interface of the second IO pin expansion board 0422 is connected to the digital relay module of the cabin control cabinet 05, and the digital relay module controls the shutdown signal external circuit of the fan unit through a normally closed contact.
[0084] The second controller 0421 is used to receive the propeller status monitoring result transmitted by the main side control unit 041, and output a control signal corresponding to the propeller status monitoring result to the digital relay module, so that the digital relay module controls the on and off of the shutdown signal of the shutdown signal external circuit through the normally closed contact according to the control signal.
[0085] like Figure 6 As shown, a structural schematic diagram of the slave-side control unit 042 provided by an embodiment of the utility model, the second controller 0421 is installed with a second power supply interface 0423 and a second data interface 0424, and the second IO pin header expansion board 0422 is crimped on the second controller 0421 through pins. There are 3 groups of second cable interfaces 0425 on the second IO pin header expansion board 0422, which are respectively used for the control board power indicator light, the device alarm indicator light and the digital relay module control.
[0086] The power supply and control signal of the digital relay module are provided by the slave control unit 042. Figure 7 As shown, a circuit connection diagram of a digital relay module provided by an embodiment of the utility model, the digital power saver module includes a third module interface 051, a relay coil 052, a transistor 053 and a fourth module interface 054. The third module interface 051 is used for the power supply and control signal interface of the digital relay module, including a second VCC interface 0511, a second GND terminal 0513 and a second OUT terminal 0512. The second OUT terminal 0512 is used to output a 5VDC signal. The fourth module interface 054 is used for the external circuit control interface of the digital relay module (controlling the on and off of the shutdown signal), including a normally closed contact 0541 (Normally Closed, NC), a normally open contact 0542 (Normally Open, NO), a non-applicable contact 0543 (Not Applicable, N / A) and a common contact 0544 (Common, COM), the normally closed contact 0541 is connected to the industrial automation control component, and the common contact 0544 is connected to the 24VDC power supply 056. When the propeller status monitoring result is normal, the slave control unit 042 outputs a low-level control signal, the normally closed contact of the digital relay is turned on, and the 24VDC signal of the shutdown signal external circuit is fed back to the industrial automation control component 055, and the wind turbine operates normally. When the propeller status monitoring result is a fault, the slave control unit 042 outputs a high-level 5VDC control signal, the normally closed contact of the digital relay is turned off, and the 24VDC signal of the shutdown signal external circuit cannot be fed back to the industrial automation control component 055, and the wind turbine is controlled to achieve fault shutdown.
[0087] Optionally, for the second controller 0421 to implement the functions of cyclic scanning of serial port data, control of external circuit digital relays, power indicator light display and fault indicator light display, the monitoring variables can be assigned or pins can be specified as shown in Table 5, and then the pin mode can be set and the transmission baud rate can be determined as shown in Table 6, and then the cyclic detection mode can be set as shown in Table 7, and finally the monitoring status output program can be written as shown in Table 8.
[0088] Table 5
[0089]
[0090] Table 6
[0091]
[0092] Table 7
[0093] Action Name Program meaning void loop() Cycle operation if(Serial.available()>0) If there is data input in the serial port
[0094] Table 8
[0095]
[0096]
[0097] The utility model provides a variable pitch bearing bolt monitoring system, which includes: a strain line 02, a strain gauge sensor module 03 and a central controller 04, wherein the strain line 02 is installed on a target bolt 01 of a variable pitch bearing in a wind turbine generator set, and the strain line 02 is connected to the strain gauge sensor module 03 to form a bolt monitoring circuit of the variable pitch bearing; the strain gauge sensor module 03 is connected to the central controller 04; the strain gauge sensor module 03 is used to output a bolt monitoring signal to the central controller 04 according to the connectivity state of the strain line 02; the central controller 04 is used to determine whether the target bolt 01 of the variable pitch bearing is broken according to the received bolt monitoring signal, and obtain a monitoring result of the paddle state of the variable pitch bearing. The utility model can timely and effectively discover the fracture of the variable pitch bearing bolt by real-time monitoring the connectivity state of the strain line 02 installed on the target bolt 01 of the variable pitch bearing in the wind turbine generator set, thereby helping to reduce the risk of the variable pitch bolt fracture accident.
[0098] In the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.
[0099] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims
1. A variable pitch bearing bolt monitoring system, characterized in that: include: A strain wire (02), a strain gauge sensor module (03) and a central controller (04), wherein the strain wire (02) is installed on a target bolt (01) of a variable pitch bearing in a wind turbine generator set, and the strain wire (02) is connected to the strain gauge sensor module (03) to form a bolt monitoring circuit of the variable pitch bearing; the strain gauge sensor module (03) is connected to the central controller (04); The strain gauge sensor module (03) is used to output a bolt monitoring signal to the central controller (04) according to the connectivity status of the strain line (02); The central controller (04) is used to determine whether the target bolt (01) of the variable pitch bearing is broken based on the received bolt monitoring signal, and obtain a monitoring result of the blade state of the variable pitch bearing.
2. The system according to claim 1, characterized in that The central controller (04) is also used to control the wind turbine set according to the propeller status monitoring result.
3. The system according to claim 2, characterized in that The central controller (04) comprises a master-side control unit (041) and a slave-side control unit (042), wherein the master-side control unit (041) and the slave-side control unit (042) are connected via wireless communication, the master-side control unit (041) is connected to the strain gauge sensor module (03), and the slave-side control unit (042) is connected to a cabin control cabinet (05) of the wind turbine generator set; The master-side control unit (041) is used to receive the bolt monitoring signal output by the strain gauge sensor module (03), determine whether the target bolt (01) of the variable pitch bearing is broken, obtain the propeller state monitoring result of the variable pitch bearing, and transmit the propeller state monitoring result to the slave-side control unit (042); The slave-side control unit (042) is used to receive the propeller status monitoring result transmitted by the master-side control unit (041), and control the on and off of the shutdown signal of the cabin control cabinet (05) according to the propeller status monitoring result.
4. The system according to claim 3, characterized in that The master-side control unit (041) comprises a first controller (0411) and a first IO pin row expansion board (0412), wherein the first IO pin row expansion board (0412) is crimped onto the first controller (0411) via pins, a first interface of the first IO pin row expansion board (0412) is connected to the strain gauge sensor module (03), and a second interface of the first IO pin row expansion board (0412) is connected to a propeller status indicator light of the pitch bearing; The first controller (0411) is used to receive the bolt monitoring signal output by the strain gauge sensor module (03) through the first interface, control the propeller status indicator light through the second interface according to the propeller status monitoring result, and transmit the propeller status monitoring result to the slave side control unit (042) through the wireless communication method.
5. The system according to claim 3 or 4, characterized in that: The slave-side control unit (042) comprises a second controller (0421) and a second IO pin row expansion board (0422), the second IO pin row expansion board (0422) is crimped onto the second controller (0421) via pins, a third interface of the second IO pin row expansion board (0422) is connected to a digital relay module of the cabin control cabinet (05), and the digital relay module controls the shutdown signal external circuit of the wind turbine generator set via a normally closed contact; The second controller (0421) is used to receive the propeller status monitoring result transmitted by the main side control unit (041), and output a control signal corresponding to the propeller status monitoring result to the digital relay module, so that the digital relay module controls the on and off of the shutdown signal of the shutdown signal external circuit through the normally closed contact according to the control signal.
6. The system according to claim 1, characterized in that The target bolts (01) include a continuous preset number of bolts at the 0° position and the 180° position of the variable pitch bearing.
7. The system according to claim 6, characterized in that The preset number is 10.
8. The system according to claim 3, characterized in that The wireless communication method is Bluetooth communication.
9. The system according to claim 1, characterized in that The strain wire (02) is mounted on the target bolt (01) of the pitch bearing by means of bonding or magnetic attraction.
10. The system according to claim 3, characterized in that The master-side control unit (041) is mounted on a hub connected to the variable pitch bearing, and the slave-side control unit (042) is mounted on a slip ring bracket of the wind turbine generator set.