Device and method for automatically monitoring and controlling lubrication of wind driven generator transmission system

Abstract

The invention discloses a device and a method for automatically monitoring and controlling lubrication of a transmission system of a wind driven generator, and the transmission system of the wind driven generator is fixed in a transmission chain cabin through a shell mounting seat; the wind driven generator transmission system comprises a main shaft, a shell, a first-stage planet wheel, a first-stage sun wheel, a second-stage planet carrier, a second-stage planet wheel, a second-stage sun wheel, a parallel-stage planet carrier and a parallel-stage output shaft. The automatic monitoring and lubrication control device for the wind driven generator transmission system comprises a transmission monitoring system, a bearing lubrication system and a gear lubrication system. Automatic monitoring of the transmission system of the axial-flow type wind driven generator is achieved through the optical fiber sensor and the temperature sensor, the control strategy that the axial-flow type wind driven generator is lubricated and cooled in a regional and flow dividing mode through the lubricating power system is adopted, and the lubricating efficiency is greatly improved; and the service lives of a transmission system and lubricating oil of the axial-flow type wind driven generator are prolonged.

Description

Technical Field

[0001] The present invention relates to the field of wind power, and particularly to a device and method for automatically monitoring and controlling the lubrication of a wind turbine drive system. Background Art

[0002] As one of the core components of a wind turbine generator set, the axial-flow wind turbine plays an important role, especially in medium and small wind turbine generator sets. Since its birth, the lubrication of its drive system has been the top priority of research.

[0003] At present, for the lubrication system of the axial-flow wind turbine drive system, most of them lead out a fuel pipe from the fuel tank and lubricate each component of the axial-flow wind turbine in turn. At the main shaft bearing position, oil is sprayed at multiple points through an oil distribution ring. There are problems such as inability to lubricate automatically in a timely manner and difficulty in quantitatively spraying oil at different positions, resulting in dry friction at some key positions, seriously affecting the service life of components such as internal gears of the wind turbine. For lubricating the tooth surface of the internal gear, the fuel pipe is connected to the rotating component. When the rotating component rotates, the lubricating oil inside the rotating components such as the gear is difficult to lubricate along the established route, so the lubrication effect of the gear tooth surface is poor, and failures such as tooth surface wear, peeling, gear meshing noise and even tooth breakage often occur.

[0004] In summary, at present, the lubrication of the axial-flow wind turbine drive system still needs to be continuously improved. There is no automatic detection and control lubrication method and device that more conforms to the actual operation for the known axial-flow wind turbine drive system. Currently, the lubrication situation of the drive system is checked manually regularly, which seriously increases the labor and time costs. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a device for automatically monitoring and controlling the lubrication of a wind turbine drive system with a simple structure and high automation degree, and provides a method for automatically monitoring and controlling the lubrication of a wind turbine drive system with convenient operation.

[0006] The technical solution of the present invention to solve the above technical problems is: a device for automatically monitoring and controlling the lubrication of a wind turbine drive system. The wind turbine drive system is fixed inside the drive chain nacelle through a housing mounting seat. The wind turbine drive system includes a main shaft, a housing, a first-stage planetary gear, a first-stage sun gear, a second-stage planetary carrier, a second-stage planetary gear, a second-stage sun gear, a parallel-stage planetary carrier, and a parallel-stage output shaft. The front and rear ends of the main shaft are respectively installed on the inner wall of the housing through a front main shaft sliding bearing and a rear main shaft sliding bearing. The rear end of the main shaft is fixedly connected to the first-stage planetary gear; the first-stage planetary gear is in contact with the housing through gears, and the first-stage planetary gear and the first-stage sun gear are connected by gear meshing. The first-stage sun gear and the front end of the second-stage planetary carrier are connected by gear meshing and the axial displacement is restricted by sliding fit. The front and rear ends of the second-stage planetary carrier are respectively installed on the inner wall of the housing through a front second-stage planetary carrier sliding bearing and a rear second-stage planetary carrier sliding bearing; the second-stage planetary gear is installed on the second-stage planetary carrier, the second-stage planetary gear is meshed with the housing through gears, the second-stage planetary gear and the second-stage sun gear are assembled by gear meshing, and the second-stage sun gear and the front end of the parallel-stage planetary carrier are connected by gear meshing and the axial displacement is restricted by sliding fit; the front end of the parallel-stage planetary carrier is installed on the inner wall of the housing through a front parallel-stage planetary carrier sliding bearing, the rear end of the parallel-stage planetary carrier is assembled on the parallel-stage planetary carrier limiting shaft through a rear parallel-stage planetary carrier sliding bearing, and the parallel-stage planetary carrier limiting shaft is fixedly connected to the housing; the front and rear ends of the parallel-stage output shaft are respectively installed on the inner wall of the housing through a front parallel-stage output shaft sliding bearing and a rear parallel-stage output shaft sliding bearing, and the parallel-stage output shaft and the parallel-stage planetary carrier are assembled by gear meshing; it further includes a drive monitoring system for monitoring the temperature of each sliding bearing, a bearing lubrication system for lubricating each sliding bearing, and a gear lubrication system for lubricating the gears.

[0007] For the above device for automatically monitoring and controlling the lubrication of the wind turbine drive system, the bearing lubrication system includes a front main shaft sliding bearing lubrication system, a rear main shaft sliding bearing lubrication system, a second-stage planetary carrier sliding bearing lubrication system, a front parallel-stage planetary carrier sliding bearing lubrication system, a rear parallel-stage planetary carrier sliding bearing lubrication system, a front parallel-stage output shaft sliding bearing lubrication system, and a rear parallel-stage output shaft sliding bearing lubrication system.

[0008] For the above device for automatically monitoring and controlling the lubrication of the wind turbine drive system, the front main shaft sliding bearing lubrication system includes a front main shaft sliding bearing nozzle and a corresponding first lubrication power system. A plurality of front main shaft sliding bearing nozzles are fixedly installed on the inner wall of the housing and are located at the front end position of the main shaft for lubricating and cooling the front main shaft sliding bearing. The front main shaft sliding bearing nozzle is connected to the pump oil outlet of the corresponding first lubrication power system;

[0009] The lubrication system for the sliding bearing at the rear end of the main shaft includes a nozzle for the sliding bearing at the rear end of the main shaft and a corresponding second lubrication power system. A plurality of nozzles for the sliding bearing at the rear end of the main shaft are fixedly installed on the inner wall of the housing and are located at the rear end position of the main shaft, for lubricating and cooling the sliding bearing at the rear end of the main shaft. The nozzle for the sliding bearing at the rear end of the main shaft is connected to the pump oil outlet of the corresponding second lubrication power system;

[0010] The lubrication system for the sliding bearing at the front end of the second-stage planet carrier includes a lubrication pipeline for the bearings of the first-stage planetary gear train, a nozzle for the sliding bearing at the front end of the second-stage planet carrier, a nozzle for the sliding bearing at the rear end of the second-stage planet carrier, and a corresponding third lubrication power system. A plurality of nozzles for the sliding bearing at the front end of the second-stage planet carrier are fixedly installed on the inner wall of the housing and are located at the front end position of the second-stage planet carrier, for lubricating and cooling the area near the sliding bearing at the front end of the second-stage planet carrier; A plurality of nozzles for the sliding bearing at the rear end of the second-stage planet carrier are fixedly installed on the inner wall of the housing and are located at the rear end position of the second-stage planet carrier, for lubricating and cooling the area near the sliding bearing at the rear end of the second-stage planet carrier; The nozzle for the sliding bearing at the front end of the second-stage planet carrier is connected to the pump oil outlet of the corresponding third lubrication power system through the lubrication pipeline for the bearings of the first-stage planetary gear train, and the nozzle for the sliding bearing at the rear end of the second-stage planet carrier is connected to the pump oil outlet of the corresponding fourth lubrication power system through the lubrication pipeline for the bearings of the second-stage planetary gear train;

[0011] The lubrication system for the sliding bearing at the front end of the parallel-stage planet carrier includes a lubrication pipeline for the bearings of the second-stage planetary gear train, a nozzle for the sliding bearing at the front end of the parallel-stage planet carrier, and a corresponding fourth lubrication power system. A plurality of nozzles for the sliding bearing at the front end of the parallel-stage planet carrier are fixedly installed on the inner wall of the housing and are located at the front end position of the parallel-stage planet carrier, for lubricating and cooling the area around the sliding bearing at the front end of the parallel-stage planet carrier; The nozzle for the sliding bearing at the front end of the parallel-stage planet carrier is connected to the pump oil outlet of the corresponding fourth lubrication power system through the lubrication pipeline for the bearings of the second-stage planetary gear train;

[0012] The lubrication system for the sliding bearing at the rear end of the parallel-stage planet carrier includes a lubrication pipeline for the parallel-stage bearings, a nozzle for the sliding bearing at the rear end of the parallel-stage planet carrier, and a corresponding fifth lubrication power system. A plurality of nozzles for the sliding bearing at the rear end of the parallel-stage planet carrier are fixedly installed on the inner wall of the housing and are located at the rear end position of the parallel-stage planet carrier, for lubricating and cooling the area near the sliding bearing at the rear end of the parallel-stage planet carrier; The nozzle for the sliding bearing at the rear end of the parallel-stage planet carrier is connected to the pump oil outlet of the corresponding fifth lubrication power system through the lubrication pipeline for the parallel-stage bearings;

[0013] The lubrication system for the front-end sliding bearings of the parallel output shaft includes several front-end sliding bearing nozzles for the parallel stage. All the front-end sliding bearing nozzles for the parallel stage are fixedly installed on the inner wall of the housing and are located at the front-end position of the parallel output shaft. The lubrication system for the rear-end sliding bearings of the parallel output shaft includes several rear-end sliding bearing nozzles for the parallel stage. All the rear-end sliding bearing nozzles for the parallel stage are fixedly installed on the inner wall of the housing and are located at the rear-end position of the parallel output shaft. The lubrication system for the front-end sliding bearings of the parallel output shaft, the lubrication system for the rear-end sliding bearings of the parallel output shaft are connected to the lubrication system for the rear-end sliding bearings of the parallel planetary carrier, to lubricate and cool the positions around the front-end sliding bearings and the rear-end sliding bearings of the parallel output shaft.

[0014] The above device for automatically monitoring and controlling the lubrication of the wind turbine drive system, the drive monitoring system includes an optical fiber speed sensor, a front-end temperature sensor of the main shaft, a rear-end temperature sensor of the main shaft, a rear-end temperature sensor of the parallel planetary carrier, a rear-end temperature sensor of the second-stage planetary carrier, and a front-end temperature sensor of the second-stage planetary carrier;

[0015] The optical fiber speed sensor is fixedly installed on the housing and is located below the first-stage planetary gear. The optical fiber speed sensor detects the speed of the main shaft;

[0016] The front-end temperature sensor of the main shaft is installed on the housing and is in the same plane as the front-end sliding bearing nozzle of the main shaft, and is used to detect the temperature at the front-end sliding bearing of the main shaft;

[0017] The rear-end temperature sensor of the main shaft is fixed to the housing and is located at the front-end position of the rear-end sliding bearing of the main shaft, and is used to detect the temperature near the rear-end sliding bearing of the main shaft;

[0018] The rear-end temperature sensor of the parallel planetary carrier is fixedly connected to the limiting shaft of the parallel planetary carrier and is in the same plane as the rear-end sliding bearing nozzle of the parallel planetary carrier, and is used to measure the temperature near the rear-end sliding bearing of the parallel planetary carrier;

[0019] The rear-end temperature sensor of the second-stage planetary carrier is fixedly connected to the housing and is located at the rear-end position of the second-stage planetary carrier, and is used to measure the temperature near the rear-end sliding bearing of the second-stage planetary carrier;

[0020] The front-end temperature sensor of the second-stage planetary carrier is fixedly connected to the housing and is located at the front-end position of the second-stage planetary carrier, and is used to measure the temperature near the front-end sliding bearing of the second-stage planetary carrier.

[0021] The above device for automatically monitoring and controlling the lubrication of the wind turbine drive system, the gear lubrication system includes a first-stage planetary gear train tooth surface lubrication system, a second-stage planetary gear train tooth surface lubrication system, and a parallel gear train tooth surface lubrication system; the first-stage planetary gear train tooth surface lubrication system includes a plurality of first-stage planetary gear train tooth surface lubrication nozzles fixed on the housing, which are used to lubricate and cool the contact surface between the first-stage planetary gear and the housing, and the contact surface between the first-stage planetary gear and the first-stage sun gear; all the first-stage planetary gear train tooth surface lubrication nozzles are connected to the pump oil outlet of the corresponding sixth lubrication power system; the lubricating oil is transported from the pump oil outlet of the sixth lubrication power system to the first-stage planetary gear train tooth surface lubrication nozzles, first lubricating the contact surface between the first-stage planetary gear and the housing. As time goes by, the lubricating oil flows from the first-stage planetary gear to the contact surface between the first-stage planetary gear and the first-stage sun gear to lubricate and cool it. Finally, the lubricating oil flows to the bottom and returns to the oil tank through the outlet.

[0022] The above device for automatically monitoring and controlling the lubrication of the wind turbine drive system, the second-stage planetary gear train tooth surface lubrication system includes a plurality of second-stage planetary gear train tooth surface lubrication nozzles fixedly connected to the housing, which are used to lubricate and cool the contact surface between the housing and the second-stage planetary gear, and the contact surface between the second-stage planetary gear and the second-stage sun gear. All the second-stage planetary gear train tooth surface lubrication nozzles are connected to the pump oil outlet of the corresponding seventh lubrication power system; the lubricating oil is transported from the seventh lubrication power system to the second-stage planetary gear train tooth surface lubrication nozzles to lubricate the contact surface between the housing and the second-stage planetary gear. As the gears rotate, the lubricating oil flows to the contact surface between the second-stage planetary gear and the second-stage sun gear to lubricate and cool it. Finally, the lubricating oil flows to the bottom and returns to the oil tank through the outlet.

[0023] The above device for automatically monitoring and controlling the lubrication of the wind turbine drive system, the parallel gear train tooth surface lubrication system includes a plurality of parallel gear train tooth surface lubrication nozzles fixed on the housing. The parallel gear train tooth surface lubrication nozzles are located on both sides of the meshing position between the parallel output shaft gear and the rear-end gear of the parallel planetary carrier, and are used to lubricate and cool the area near the contact between the parallel output shaft and the parallel planetary carrier. The parallel gear train tooth surface lubrication nozzles are connected to the pump oil outlet of the corresponding eighth lubrication power system; the lubricating oil flows from the pump oil outlet of the eighth lubrication power system to the parallel gear train tooth surface lubrication nozzles to lubricate the meshing position between the parallel output shaft gear and the rear-end gear of the parallel planetary carrier. Under the rotation of the parallel output shaft and the parallel planetary carrier, the lubricating oil flows into the bottom and returns to the oil tank through the outlet.

[0024] The above device for automatically monitoring and controlling lubrication of a wind turbine drive system, the first lubrication power system, the second lubrication power system, the third lubrication power system, the fourth lubrication power system, the fifth lubrication power system, the sixth lubrication power system, the seventh lubrication power system, and the eighth lubrication power system have the same structure, and each includes a motor, a pump, an oil delivery pipe, and a pump oil outlet; each nozzle is connected to the corresponding pump oil outlet, the pump and the fuel tank are connected through the oil delivery pipe, the motor provides power for the pump, and the signal processor controls the motor speed according to the received PWM control signal, thereby adjusting the flow rate at the pump oil outlet.

[0025] A method for automatically monitoring and controlling lubrication of a wind turbine drive system includes the following steps:

[0026] Step 1: Establish a communication protocol and set up a 4G / 5G / WIFI multi-mode communication module; configure the MQTT protocol to connect to the cloud platform and set a 15-second heartbeat packet interval; establish a unique device identification code including geographical location information; perform a power-on self-check function: use a 5-second pulse to test the performance of each lubrication power system motor under no-load; perform zero calibration on the optical fiber speed sensor, the front-end temperature sensor of the main shaft, the rear-end temperature sensor of the main shaft, the rear-end temperature sensor of the parallel-stage planetary carrier, the front-end temperature sensor of the second-stage planetary carrier, and the rear-end temperature sensor of the second-stage planetary carrier; use a 30-second pressure-holding test to check the attenuation of the lubricating oil pipeline pressure and make timely adjustments; synchronize the parameters to the cloud.

[0027] Step 2: The optical fiber speed sensor monitors the main shaft speed in real time, the front-end temperature sensor of the main shaft, the rear-end temperature sensor of the main shaft, the rear-end temperature sensor of the parallel-stage planetary carrier, the front-end temperature sensor of the second-stage planetary carrier, and the rear-end temperature sensor of the second-stage planetary carrier monitor the temperature values at the corresponding positions in real time, monitor the pumps of the 8 lubrication power systems in real time, monitor the flow rate set value in real time, and preprocess the monitored data every 200 ms and store it in the locally set SD card.

[0028] Step 3: The signal processor calculates the transmission ratio based on the number of gear teeth, calculates the speeds of each component, and determines whether the speed is greater than the working speed threshold corresponding to each component. If so, go to Step 4; otherwise, return to continue determining the speed.

[0029] Step 4: The signal processor determines whether the temperature at each position is greater than the working temperature. If so, go to Step 5; otherwise, return to continue determining the temperature.

[0030] Step 5: The signal processor sends PWM control signals to the first lubrication power system, the second lubrication power system, the third lubrication power system, the fourth lubrication power system, the fifth lubrication power system, the sixth lubrication power system, the seventh lubrication power system, and the eighth lubrication power system respectively according to the received signals, increasing or decreasing the lubricating oil flow at different positions; the cloud platform provides a three-dimensional gearbox lubrication thermal map, historical data trend analysis to support year-on-year / month-on-month comparison, and triple verification of key alarm parameters;

[0031] Step 6: The signal processor synchronously pushes the results to the site, the cloud platform, and the mobile terminal. The control range of the site is full-function control, the control range of the cloud platform is the adjustment of speed, temperature, and flow parameters and the start / stop of the entire system, and the control range of the mobile terminal is to monitor each state.

[0032] In the above method for automatically monitoring and controlling the lubrication of the wind turbine drive system, in Step 4, a temperature buffer zone is set, and according to ΔT(t) is automatically adjusted, where T is the temperature, t is the time, and ΔT(t) refers to the temperature change function with time, preventing the pump of the lubrication power system from frequently responding due to temperature fluctuations; the buffer zone temperature is determined. When the temperature at a certain position is greater than the buffer zone start temperature at that position, the linear flow rate of the lubricating oil is increased, otherwise, continue to judge. If the buffer zone temperature at this place is less than the buffer zone stop temperature at that position, the linear flow rate of the lubricating oil is decreased, otherwise, keep the current lubricating oil flow rate; in Step 5, hierarchical control is set for the flow rate of the lubricating oil. On the one hand, non-linear adjustment is used, and on the other hand, speed compensation is set for the first-stage planetary gear and the second-stage planetary gear to reduce the deviation from the actual speed.

[0033] The beneficial effects of the present invention are as follows:

[0034] 1. The present invention adopts the method of directly supplying oil to the nozzles, cancels the oil distribution ring, can effectively eliminate the situation that some nozzles do not have lubricating oil during the oil transmission process of the oil distribution ring, and avoids the oil supply method on rotating components, relying on the self-weight of the lubricating oil and the rotation of the components to lubricate the tooth surface.

[0035] 2. The device of the present invention realizes the automatic monitoring of the axial flow wind turbine drive system through optical fiber sensors and temperature sensors, and through the control strategy of the lubrication power system to lubricate and cool the axial flow wind turbine in different regions and with different flow rates, greatly improving the lubrication efficiency and increasing the service life of the axial flow wind turbine drive system and the lubricating oil.

[0036] 3. The present invention sets a three-dimensional visualization interface to intuitively display the real-time lubrication coverage range of each nozzle, and combines the multi-dimensional analysis of vibration data to greatly improve the fault identification accuracy rate and increase the service life of the axial flow wind turbine drive system and the lubricating oil. Description of the Drawings

[0037] Figure 1 It is a schematic diagram of the overall structure of the device for automatically monitoring and controlling lubrication according to the present invention.

[0038] Figure 2 It is Figure 1 a longitudinal sectional view of

[0039] Figure 3 It is Figure 1 an oblique sectional view of

[0040] Figure 4 It is a schematic diagram of the lubrication power system structure.

[0041] Figure 5 It is a schematic diagram of the distribution of lubricating nozzles and temperature sensors for the front-end lubricating bearing of the main shaft.

[0042] Figure 6 It is a schematic diagram of the distribution of lubricating nozzles and temperature sensors for the rear-end lubricating bearing of the main shaft.

[0043] Figure 7 It is a schematic diagram of the distribution of fiber optic rotational speed sensors.

[0044] Figure 8 It is a schematic diagram of the distribution of lubricating nozzles on the tooth surface of the first-stage planetary gear train.

[0045] Figure 9 It is a schematic diagram of the distribution of lubricating nozzles on the tooth surface of the second-stage planetary gear train.

[0046] Figure 10 It is a schematic diagram of the distribution of lubricating nozzles for the front-end sliding bearing of the parallel stage.

[0047] Figure 11 It is a schematic diagram of the distribution of lubricating nozzles and temperature sensors for the parallel stage gear train.

[0048] Figure 12 It is a schematic diagram of the distribution of lubricating nozzles for the front-end sliding bearing of the second-stage planet carrier.

[0049] Figure 13 It is a schematic diagram of the distribution of lubricating nozzles for the front-end sliding bearing of the parallel stage planet carrier.

[0050] Figure 14 It is a schematic diagram of the distribution of lubricating nozzles and temperature sensors for the rear-end sliding bearing of the second-stage planet carrier.

[0051] Figure 15 It is a schematic diagram of the distribution of lubricating nozzles for the front-end sliding bearing of the parallel stage planet carrier from another perspective.

[0052] Figure 16 It is a schematic diagram of the distribution of the oil circuit and temperature sensors for the parallel stage gear train.

[0053] Figure 17It is a schematic diagram of the bearing and oil circuit distribution.

[0054] Figure 18 It is a schematic diagram of the distribution of temperature sensors at the front end of the second-stage planet carrier.

[0055] Figure 19 It is a flow chart of the method for automatically monitoring and controlling lubrication of the present invention. Detailed implementation manners

[0056] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0057] As Figures 1-18 shown, a device for automatically monitoring and controlling lubrication of a wind turbine drive system, the wind turbine drive system is fixed inside the drive chain nacelle through a housing mounting seat 16, and the wind turbine drive system includes a main shaft 13, a housing 17, a first-stage planet gear 10, a first-stage sun gear 19, a second-stage planet carrier 21, a second-stage planet gear 7, a second-stage sun gear 23, a parallel-stage planet carrier 3, and a parallel-stage output shaft 29. The front and rear ends of the main shaft 13 are respectively installed on the inner wall of the housing 17 through a front main shaft sliding bearing 15 and a rear main shaft sliding bearing 12, and the rear end of the main shaft 13 is fixedly connected to the first-stage planet gear 10; the first-stage planet gear 10 is in gear contact with the housing 17, and the first-stage planet gear 10 and the first-stage sun gear 19 are connected by gear meshing, and the first-stage sun gear 19 and the front end of the second-stage planet carrier 21 are connected by gear meshing and axially displaced by sliding fit. The front and rear ends of the second-stage planet carrier 21 are respectively installed on the inner wall of the housing 17 through a front second-stage planet carrier sliding bearing 9 and a rear second-stage planet carrier sliding bearing 6; the second-stage planet gear 7 is installed on the second-stage planet carrier 21, the second-stage planet gear 7 is in gear meshing connection with the housing 17, the second-stage planet gear 7 and the second-stage sun gear 23 are assembled by gear meshing, and the second-stage sun gear 23 and the front end of the parallel-stage planet carrier 3 are connected by gear meshing and axially displaced by sliding fit; the front end of the parallel-stage planet carrier 3 is installed on the inner wall of the housing 17 through a front parallel-stage planet carrier sliding bearing 5, the rear end of the parallel-stage planet carrier 3 is assembled on a parallel-stage planet carrier limiting shaft 31 through a rear parallel-stage planet carrier sliding bearing 26, and the parallel-stage planet carrier limiting shaft 31 is fixedly connected to the housing 17; the front and rear ends of the parallel-stage output shaft 29 are respectively installed on the inner wall of the housing 17 through a front parallel-stage output shaft sliding bearing 32 and a rear parallel-stage output shaft sliding bearing 30, and the parallel-stage output shaft 29 and the parallel-stage planet carrier 3 are assembled by gear meshing; it further includes a drive monitoring system for monitoring the temperature of each sliding bearing, a bearing lubrication system for lubricating each sliding bearing, and a gear lubrication system for lubricating the gears.

[0058] When the oncoming wind blows the blades to rotate, the blades drive the hub to rotate, the hub drives the main shaft 13 to rotate, and the first-stage planet gears 10 rotate driven by the main shaft 13, thus causing the first-stage sun gear 19 to rotate; the second-stage planet carrier 21 rotates axially under the force applied by the first-stage sun gear 19 to it. The second-stage planet gears 7 rotate in engagement with the housing gear driven by the second-stage planet carrier 21. Since the housing 17 remains stationary, the second-stage sun gear 23 rotates accordingly; the parallel-stage planet carrier 3 can only rotate axially driven by the second-stage sun gear 23 because the radial displacement of the parallel-stage planet carrier is restricted by the parallel-stage planet carrier limiting shaft 31; the parallel-stage output shaft 29 and the parallel-stage planet carrier 3 are assembled through gear engagement. When the parallel-stage planet carrier 3 rotates, the parallel-stage output shaft 29 rotates accordingly, thus realizing the transmission of force from the main shaft to the parallel-stage output shaft 29, and then delivering the force to the power generation device for power generation, completing the conversion of wind energy clean energy into electrical energy.

[0059] The bearing lubrication system includes a front-end sliding bearing lubrication system for the main shaft, a rear-end sliding bearing lubrication system for the main shaft, a sliding bearing lubrication system for the second-stage planet carrier, a front-end sliding bearing lubrication system for the parallel-stage planet carrier, a rear-end sliding bearing lubrication system for the parallel-stage planet carrier, a front-end sliding bearing lubrication system for the parallel-stage output shaft, and a rear-end sliding bearing lubrication system for the parallel-stage output shaft.

[0060] As Figure 5 shown, the front-end sliding bearing lubrication system for the main shaft includes front-end sliding bearing nozzles 14 for the main shaft and a corresponding first lubrication power system. A plurality of front-end sliding bearing nozzles 14 for the main shaft are fixedly installed on the inner wall of the housing 17 and are located at the front end position of the main shaft 13 for lubricating and cooling the front-end sliding bearing 15 of the main shaft. The front-end sliding bearing nozzles 14 for the main shaft are connected to the pump oil outlet 37 of the corresponding first lubrication power system;

[0061] As Figure 6 shown, the rear-end sliding bearing lubrication system for the main shaft includes rear-end sliding bearing nozzles 18 for the main shaft and a corresponding second lubrication power system. A plurality of rear-end sliding bearing nozzles 18 for the main shaft are fixedly installed on the inner wall of the housing 17 and are located at the rear end position of the main shaft 13 for lubricating and cooling the rear-end sliding bearing 12 of the main shaft. The rear-end sliding bearing nozzles 18 for the main shaft are connected to the pump oil outlet 37 of the corresponding second lubrication power system.

[0062] As Figure 12 and Figure 14As shown, the lubrication system for the second-stage planet carrier sliding bearings includes the lubrication pipeline 8 for the first-stage planetary gear train bearings, the front sliding bearing nozzles 36 of the second-stage planet carrier, the rear sliding bearing nozzles 34 of the second-stage planet carrier, and the corresponding third lubrication power system. A plurality of front sliding bearing nozzles 36 of the second-stage planet carrier are fixedly installed on the inner wall of the housing 17 and are located at the front end position of the second-stage planet carrier 21 for lubricating and cooling the position near the front sliding bearing 9 of the second-stage planet carrier. A plurality of rear sliding bearing nozzles 34 of the second-stage planet carrier are fixedly installed on the inner wall of the housing 17 and are located at the rear end position of the second-stage planet carrier 21 for lubricating and cooling the periphery of the rear sliding bearing 6 of the second-stage planet carrier. The front sliding bearing nozzles 36 of the second-stage planet carrier are connected to the pump oil outlet 37 of the corresponding third lubrication power system through the lubrication pipeline 8 for the first-stage planetary gear train bearings. The rear sliding bearing nozzles 34 of the second-stage planet carrier are connected to the pump oil outlet 37 of the corresponding fourth lubrication power system through the lubrication pipeline for the second-stage planetary gear train bearings.

[0063] As Figure 13 and Figure 14 shown, the lubrication system for the front sliding bearings of the parallel-stage planet carrier includes the lubrication pipeline 4 for the second-stage planetary gear train bearings, the front sliding bearing nozzles 35 of the parallel-stage planet carrier, and the corresponding fourth lubrication power system. A plurality of front sliding bearing nozzles 35 of the parallel-stage planet carrier are fixedly installed on the inner wall of the housing 17 and are located at the front end position of the parallel-stage planet carrier 3 for lubricating and cooling the periphery of the front sliding bearing 5 of the parallel-stage planet carrier. The front sliding bearing nozzles 35 of the parallel-stage planet carrier and the rear sliding bearing nozzles 34 of the second-stage planet carrier are both connected to the pump oil outlet 37 of the corresponding fourth lubrication power system through the lubrication pipeline 4 for the second-stage planetary gear train bearings;

[0064] As Figure 11 shown, the lubrication system for the rear sliding bearings of the parallel-stage planet carrier includes the parallel-stage bearing lubrication pipeline 2, the rear sliding bearing nozzles 41 of the parallel-stage planet carrier, and the corresponding fifth lubrication power system. A plurality of rear sliding bearing nozzles 41 of the parallel-stage planet carrier are fixedly installed on the inner wall of the housing 17 and are located at the rear end position of the parallel-stage planet carrier 3 for lubricating and cooling the position near the rear sliding bearing 26 of the parallel-stage planet carrier. The rear sliding bearing nozzles 41 of the parallel-stage planet carrier are connected to the pump oil outlet 37 of the corresponding fifth lubrication power system through the parallel-stage bearing lubrication pipeline 2;

[0065] As Figure 15 and Figure 16As shown, the lubrication system for the front sliding bearings of the parallel output shafts includes a number of nozzles 43 for the front sliding bearings of the parallel output shafts. All the nozzles 43 for the front sliding bearings of the parallel output shafts are fixedly installed on the inner wall of the housing 17 and are located at the front end position of the parallel output shafts 29. The lubrication system for the rear sliding bearings of the parallel output shafts includes a number of nozzles 44 for the rear sliding bearings of the parallel output shafts. All the nozzles 44 for the rear sliding bearings of the parallel output shafts are fixedly installed on the inner wall of the housing 17 and are located at the rear end position of the parallel output shafts 29. The lubrication system for the front sliding bearings of the parallel output shafts, the lubrication system for the rear sliding bearings of the parallel output shafts are connected to the lubrication system for the rear sliding bearings of the parallel planetary carrier, and lubricate and cool the positions around the front sliding bearings 32 of the parallel output shafts and the rear sliding bearings 30 of the parallel output shafts.

[0066] The transmission monitoring system includes an optical fiber rotational speed sensor 11, a front spindle temperature sensor 38, a rear spindle temperature sensor 39, a rear parallel planetary carrier temperature sensor 42, a rear second-stage planetary carrier temperature sensor 33, and a front second-stage planetary carrier temperature sensor 45;

[0067] The optical fiber rotational speed sensor 11 is fixedly installed on the housing 17 and is located below the first-stage planet gear 10. The optical fiber rotational speed sensor 11 detects the rotational speed of the main shaft 13;

[0068] As Figure 5 shown, the front spindle temperature sensor 38 is installed on the housing 17 and is in the same plane as the nozzle 14 for the front sliding bearing of the main shaft, and is used to detect the temperature at the front sliding bearing 15 of the main shaft;

[0069] As Figure 6 shown, the rear spindle temperature sensor 39 is fixed to the housing 17 and is located at the front end position of the rear sliding bearing 12 of the main shaft, and is used to detect the temperature near the rear sliding bearing 12 of the main shaft;

[0070] As Figure 11 shown, the rear parallel planetary carrier temperature sensor 42 is fixedly connected to the parallel planetary carrier limit shaft 31 and is in the same plane as the nozzle 41 for the rear sliding bearing of the parallel planetary carrier, and is used to measure the temperature near the rear sliding bearing 26 of the parallel planetary carrier;

[0071] As Figure 14 shown, the rear second-stage planetary carrier temperature sensor 33 is fixedly connected to the housing 17 and is located at the rear end position of the second-stage planetary carrier 21, and is used to measure the temperature near the rear sliding bearing 6 of the second-stage planetary carrier;

[0072] As Figure 18As shown, the temperature sensor 45 at the front end of the second-stage planetary carrier is fixedly connected to the housing 17 and is located at the front end position of the second-stage planetary carrier 21, and is used to measure the temperature near the sliding bearing 9 at the front end of the second-stage planetary carrier;

[0073] The gear lubrication system includes the tooth surface lubrication system of the first-stage planetary gear train, the tooth surface lubrication system of the second-stage planetary gear train, and the tooth surface lubrication system of the parallel gear train; the tooth surface lubrication system of the first-stage planetary gear train includes a plurality of first-stage planetary gear train tooth surface lubrication nozzles 20 fixed on the housing 17, which are used to lubricate and cool the contact surface between the first-stage planetary gear 10 and the housing 17 and the contact surface between the first-stage planetary gear 10 and the first-stage sun gear 19; all the first-stage planetary gear train tooth surface lubrication nozzles 20 are connected to the pump oil outlet 37 of the corresponding sixth lubrication power system; the lubricating oil is transported from the pump oil outlet 37 of the sixth lubrication power system to all the first-stage planetary gear train tooth surface lubrication nozzles 20, first lubricates the contact surface between the first-stage planetary gear 10 and the housing 17, and as time goes by, the lubricating oil flows from the first-stage planetary gear 10 to the contact surface between the first-stage planetary gear 10 and the first-stage sun gear 19 to lubricate and cool it, and finally the lubricating oil flows to the bottom and flows back to the oil tank 25 through the outlet 24.

[0074] The tooth surface lubrication system of the second-stage planetary gear train includes a plurality of second-stage planetary gear train tooth surface lubrication nozzles 22 fixedly connected to the housing 17, which are used to lubricate and cool the contact surface between the housing 17 and the second-stage planetary gear 7 and the contact surface between the second-stage planetary gear 7 and the second-stage sun gear 23, and all the second-stage planetary gear train tooth surface lubrication nozzles 22 are connected to the pump oil outlet 37 of the corresponding seventh lubrication power system; the lubricating oil is transported from the seventh lubrication power system to all the second-stage planetary gear train tooth surface lubrication nozzles 22 to lubricate the contact surface between the housing 17 and the second-stage planetary gear 7, and as the gears rotate, the lubricating oil flows to the contact surface between the second-stage planetary gear 7 and the second-stage sun gear 23 to lubricate and cool it, and finally the lubricating oil flows to the bottom and flows back to the oil tank 25 through the outlet 24.

[0075] The tooth surface lubrication system of the parallel gear train includes two parallel gear train tooth surface lubrication nozzles 40 fixed on the housing 17. The parallel gear train tooth surface lubrication nozzles 40 are located on both sides of the meshing position between the gear of the parallel output shaft 29 and the rear-end gear of the parallel planetary carrier 3, and are used to lubricate and cool the area near the contact between the parallel output shaft 29 and the parallel planetary carrier 3. The parallel gear train tooth surface lubrication nozzles 40 are connected to the pump oil outlet 37 of the corresponding eighth lubrication power system; the lubricating oil flows from the pump oil outlet 37 of the eighth lubrication power system to the parallel gear train tooth surface lubrication nozzles 40 to lubricate the meshing position between the gear of the parallel output shaft 29 and the rear-end gear of the parallel planetary carrier 3. Under the rotation of the parallel output shaft 29 and the parallel planetary carrier 3, the lubricating oil flows into the bottom and flows back to the oil tank 25 through the outlet 24.

[0076] The first lubrication power system, the second lubrication power system, the third lubrication power system, the fourth lubrication power system, the fifth lubrication power system, the sixth lubrication power system, the seventh lubrication power system, and the eighth lubrication power system have the same structure, and each includes a motor 1, a pump 28, an oil delivery pipe 27, and a pump oil outlet 37; each nozzle is connected to the corresponding pump oil outlet 37, the pump 28 and the fuel tank 25 are connected through the oil delivery pipe 27, the motor 1 provides power for the pump 28, and the signal processor controls the rotation speed of the motor 1 according to the received PWM control signal, so as to adjust the flow rate of the pump oil outlet 37.

[0077] As Figure 19 shown, a method for automatically monitoring and controlling the lubrication of a wind turbine drive system includes the following steps:

[0078] Step 1: Establish a communication protocol and set a 4G / 5G / WIFI multi-mode communication module; configure the MQTT protocol to connect to the cloud platform and set a 15-second heartbeat packet interval; establish a unique device identification code including geographical location information; execute the power-on self-check function: use a 5-second pulse to perform no-load testing on the performance of the motors 1 of each lubrication power system; perform zero calibration on the optical fiber rotation speed sensor 11, the front-end temperature sensor 38 of the main shaft, the rear-end temperature sensor 39 of the main shaft, the rear-end temperature sensor 42 of the parallel-stage planetary carrier, the front-end temperature sensor 45 of the second-stage planetary carrier, and the rear-end temperature sensor 33 of the second-stage planetary carrier; use a 30-second pressure holding test to check the attenuation of the lubricating oil pipeline pressure and make timely adjustments; synchronize the parameters to the cloud.

[0079] Step 2: The optical fiber rotation speed sensor 11 monitors the rotation speed of the main shaft 13 in real time, the front-end temperature sensor 38 of the main shaft, the rear-end temperature sensor 39 of the main shaft, the rear-end temperature sensor 42 of the parallel-stage planetary carrier, the front-end temperature sensor 45 of the second-stage planetary carrier, and the rear-end temperature sensor 33 of the second-stage planetary carrier monitor the temperature values at the corresponding positions in real time, monitor the pumps 28 of the 8 lubrication power systems in real time, monitor the flow rate set value in real time, and preprocess the monitored data in a cycle of 200 ms and store it in the locally set SD card.

[0080] Step 3: The signal processor calculates the transmission ratio based on the number of teeth of the gears, calculates the rotation speeds of each component, and determines whether the rotation speed is greater than the working rotation speed threshold corresponding to each component. If so, go to Step 4; otherwise, return to continue determining the rotation speed; set a remote intervention interface, including allowing the cloud to send a rotation speed threshold override instruction; the cloud can temporarily modify the rotation speed threshold through an authorized password; set a maintenance mode to forcibly lock the start / stop state of the lubrication system when the rotation speed is abnormal.

[0081] Step 4: The signal processor determines whether the temperature at each position is greater than the working temperature. If so, go to Step 5; otherwise, return to continue determining the temperature; set a temperature buffer zone, according to Automatically adjust ΔT(t), where T is temperature and t is time, and ΔT(t) refers to the temperature change function over time, to prevent the pump 28 of the lubrication power system from frequently responding due to temperature fluctuations; determine the temperature of the buffer zone. When the temperature at a certain position is greater than the buffer zone start temperature at that position, increase the linear flow rate of the lubricating oil. Otherwise, continue to determine. If the buffer zone temperature at this location is less than the buffer zone stop temperature at that position, decrease the linear flow rate of the lubricating oil. Otherwise, maintain the current lubricating oil flow rate;

[0082] Step Five: The signal processor sends PWM control signals to the first lubrication power system, the second lubrication power system, the third lubrication power system, the fourth lubrication power system, the fifth lubrication power system, the sixth lubrication power system, the seventh lubrication power system, and the eighth lubrication power system respectively according to the received signals, increasing or decreasing the lubricating oil flow rate at different positions, and setting hierarchical control for the lubricating oil flow rate. On the one hand, use non-linear adjustment. On the other hand, set speed compensation for the first-stage planet gear 10 and the second-stage planet gear 7 to reduce the deviation from the actual speed; set a visualization interface that can display triple verification including a three-dimensional lubrication thermal map of the gearbox provided by the cloud platform, historical data trend analysis to support year-on-year / month-on-month comparison, and key alarm parameters (the speed of the main shaft 13, the temperature values at 5 positions, and the flow rates of the pumps 28 of 8 lubrication power systems);

[0083] Step Six: The signal processor synchronously pushes the results to the site, the cloud platform, and the mobile terminal. The control range at the site is full-function control. The control range of the cloud platform is the adjustment of parameters such as speed, temperature, and flow rate, and the start and stop of the entire system. The control range of the mobile terminal is to monitor each state. Parse the instructions from the cloud. Parameter updates require secondary confirmation, and emergency stop instructions are executed immediately; record the operation log according to the operator's identity information.

Claims

1. A device for automatically monitoring and controlling lubrication of a wind turbine transmission system, wherein the wind turbine transmission system is fixed to the inside of a transmission chain nacelle through a housing mounting seat, wherein the wind turbine transmission system comprises a main shaft, a housing, a first-stage planetary gear, a first-stage sun gear, a second-stage planetary carrier, a second-stage planetary gear, a second-stage sun gear, a parallel-stage planetary carrier, and a parallel-stage output shaft, wherein the front and rear ends of the main shaft are respectively mounted on the inner wall of the housing through a main shaft front end sliding bearing and a main shaft rear end sliding bearing, and the rear end of the main shaft is fixedly connected to the first-stage planetary gear; the first-stage planetary gear is in contact with the housing through gears, the first-stage planetary gear and the first-stage sun gear are meshed and connected through gears, the first-stage sun gear is meshed and connected to the front end of the second-stage planetary carrier through gears, and the axial displacement is constrained by sliding fit, and the front and rear ends of the second-stage planetary carrier are respectively mounted through the second-stage planetary carrier front end sliding bearing, The sliding bearing at the rear end of the second-stage planet carrier is installed on the inner wall of the housing; the second-stage planetary gear is installed on the second-stage planet carrier, the second-stage planetary gear is connected to the housing through gear meshing, the second-stage planetary gear and the second-stage sun gear are assembled through gear meshing, the second-stage sun gear and the front end of the parallel-stage planet carrier are connected through gear meshing, and the axial displacement is constrained by sliding fit; the front end of the parallel-stage planet carrier is installed on the inner wall of the housing through the front end sliding bearing of the parallel-stage planet carrier, the rear end of the parallel-stage planet carrier is assembled on the limit shaft of the parallel-stage planet carrier through the rear end sliding bearing of the parallel-stage planet carrier, and the limit shaft of the parallel-stage planet carrier is fixedly connected to the housing; the front and rear ends of the parallel-stage output shaft are respectively installed on the inner wall of the housing through the front end sliding bearing of the parallel-stage output shaft and the rear end sliding bearing of the parallel-stage output shaft, and the parallel-stage output shaft and the parallel-stage planet carrier are assembled through gear meshing; it is characterized in that: It also includes a transmission monitoring system for monitoring the temperature of each sliding bearing, a bearing lubrication system for lubricating each sliding bearing, and a gear lubrication system for lubricating the gears.

2. The device for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 1, characterized in that: The bearing lubrication system includes a main shaft front end sliding bearing lubrication system, a main shaft rear end sliding bearing lubrication system, a second-stage planetary frame sliding bearing lubrication system, a parallel-stage planetary frame front end sliding bearing lubrication system, a parallel-stage planetary frame rear end sliding bearing lubrication system, a parallel-stage output shaft front end sliding bearing lubrication system, and a parallel-stage output shaft rear end sliding bearing lubrication system.

3. The device for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 2, characterized in that: The spindle front end sliding bearing lubrication system comprises a spindle front end sliding bearing nozzle and a corresponding first lubrication power system, a plurality of spindle front end sliding bearing nozzles are fixedly mounted on the inner wall of the housing and are located at the front end of the spindle, and are used for lubrication and cooling of the spindle front end sliding bearing, and the spindle front end sliding bearing nozzle is connected to the corresponding first lubrication power system pump oil outlet; The spindle rear end sliding bearing lubrication system comprises a spindle rear end sliding bearing nozzle and a corresponding second lubrication power system, a plurality of spindle rear end sliding bearing nozzles are fixedly mounted on the inner wall of the housing and are located at the rear end of the spindle, and are used for lubrication and cooling of the spindle rear end sliding bearing, and the spindle rear end sliding bearing nozzle is connected to the corresponding pump oil outlet of the second lubrication power system; The second-stage planetary carrier sliding bearing lubrication system includes a first-stage planetary gear train bearing lubrication pipeline, a second-stage planetary carrier front end sliding bearing nozzle, a second-stage planetary carrier rear end sliding bearing nozzle and a corresponding third lubrication power system. A plurality of second-stage planetary carrier front end sliding bearing nozzles are fixedly mounted on the inner wall of the housing and are located at the front end of the second-stage planetary carrier, and are used for lubrication and cooling of the vicinity of the second-stage planetary carrier front end sliding bearing. A plurality of second-stage planetary carrier rear end sliding bearing nozzles are fixedly mounted on the inner wall of the housing and are located at the rear end of the second-stage planetary carrier, and are used for lubrication and cooling of the vicinity of the rear end sliding bearing of the second-stage planetary carrier; The sliding bearing nozzle at the front end of the second-stage planetary carrier is connected to the corresponding pump oil outlet of the third lubrication power system through the first-stage planetary gear train bearing lubrication pipeline, and the sliding bearing nozzle at the rear end of the second-stage planetary carrier is connected to the corresponding pump oil outlet of the fourth lubrication power system through the second-stage planetary gear train bearing lubrication pipeline; The parallel-stage planetary carrier front end sliding bearing lubrication system comprises a second-stage planetary gear train bearing lubrication pipeline, a parallel-stage planetary carrier front end sliding bearing nozzle and a corresponding fourth lubrication power system. A plurality of parallel-stage planetary carrier front end sliding bearing nozzles are fixedly mounted on the inner wall of the housing and are located at the front end of the parallel-stage planetary carrier for lubrication and cooling around the parallel-stage planetary carrier front end sliding bearing; the parallel-stage planetary carrier front end sliding bearing nozzle is connected to the corresponding fourth lubrication power system pump oil outlet through the second-stage planetary gear train bearing lubrication pipeline; The parallel-stage planetary carrier rear end sliding bearing lubrication system comprises a parallel-stage bearing lubrication pipeline, a parallel-stage planetary carrier rear end sliding bearing nozzle and a corresponding fifth lubrication power system. A plurality of parallel-stage planetary carrier rear end sliding bearing nozzles are fixedly mounted on the inner wall of the housing and are located at the rear end of the parallel-stage planetary carrier for lubrication and cooling near the parallel-stage planetary carrier rear end sliding bearing. The parallel-stage planetary carrier rear end sliding bearing nozzle is connected to the corresponding fifth lubrication power system pump oil outlet through the parallel-stage bearing lubrication pipeline. The parallel-stage output shaft front end sliding bearing lubrication system includes a plurality of parallel-stage front end sliding bearing nozzles, all of which are fixedly mounted on the inner wall of the shell and located at the front end of the parallel-stage output shaft. The parallel-stage output shaft rear end sliding bearing lubrication system includes a plurality of parallel-stage rear end sliding bearing nozzles, all of which are fixedly mounted on the inner wall of the shell and located at the rear end of the parallel-stage output shaft. The parallel-stage output shaft front end sliding bearing lubrication system and the parallel-stage output shaft rear end sliding bearing lubrication system are connected to the parallel-stage planet carrier rear end sliding bearing lubrication system to lubricate and cool the parallel-stage output shaft front end sliding bearing and the surrounding positions of the parallel-stage output shaft rear end sliding bearing.

4. The device for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 3 is characterized in that: The transmission monitoring system includes an optical fiber speed sensor, a main shaft front end temperature sensor, a main shaft rear end temperature sensor, a parallel stage planetary frame rear end temperature sensor, a second stage planetary frame rear end temperature sensor, and a second stage planetary frame front end temperature sensor; The optical fiber speed sensor is installed and fixed on the housing and is located below the first-stage planetary gear. The optical fiber speed sensor detects the speed of the main shaft. The spindle front end temperature sensor is installed on the housing and is in the same plane as the spindle front end sliding bearing nozzle, and is used to detect the temperature of the spindle front end sliding bearing; The spindle rear end temperature sensor is fixed to the housing and is located at the front end of the sliding bearing at the rear end of the spindle, and is used to detect the temperature near the sliding bearing at the rear end of the spindle; The temperature sensor at the rear end of the parallel-stage planetary frame is fixedly connected to the limiting shaft of the parallel-stage planetary frame and is located in the same plane as the nozzle of the sliding bearing at the rear end of the parallel-stage planetary frame, and is used to measure the temperature near the sliding bearing at the rear end of the parallel-stage planetary frame; The temperature sensor at the rear end of the second-stage planetary frame is fixedly connected to the housing and is located at the rear end of the second-stage planetary frame, and is used to measure the temperature near the sliding bearing at the rear end of the second-stage planetary frame; The second-stage planet carrier front end temperature sensor is fixedly connected to the housing and is located at the front end of the second-stage planet carrier, and is used to measure the temperature near the sliding bearing at the front end of the second-stage planet carrier.

5. The device for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 4, characterized in that: The gear lubrication system includes a first-stage planetary gear train tooth surface lubrication system, a second-stage planetary gear train tooth surface lubrication system, and a parallel-stage gear train tooth surface lubrication system; the first-stage planetary gear train tooth surface lubrication system includes a plurality of first-stage planetary gear train tooth surface lubrication nozzles fixed on the outer casing, which are used to lubricate and cool the contact surface between the first-stage planetary gear and the outer casing, and the contact surface between the first-stage planetary gear and the first-stage sun gear; all the first-stage planetary gear train tooth surface lubrication nozzles are connected to the corresponding pump oil outlet of the sixth lubrication power system; the lubricating oil is transported from the pump oil outlet of the sixth lubricating power system to the first-stage planetary gear train tooth surface lubrication nozzle, firstly lubricating the contact surface between the first-stage planetary gear and the outer casing, and as time goes by, the lubricating oil flows from the first-stage planetary gear to the contact surface between the first-stage planetary gear and the first-stage sun gear to lubricate and cool it, and finally the lubricating oil flows to the bottom and flows back to the oil tank through the outlet.

6. The device for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 5, characterized in that: The second-stage planetary gear train tooth surface lubrication system includes a plurality of second-stage planetary gear train tooth surface lubrication nozzles fixedly connected to the outer casing, which are used for lubricating and cooling the contact surface between the outer casing and the second-stage planetary gear, and the contact surface between the second-stage planetary gear and the second-stage sun gear. All the second-stage planetary gear train tooth surface lubrication nozzles are connected to the corresponding pump oil outlet of the seventh lubrication power system; the lubricating oil is transported from the seventh lubrication power system to the second-stage planetary gear train tooth surface lubrication nozzles to lubricate the contact surface between the outer casing and the second-stage planetary gear. As the gears rotate, the lubricating oil flows to the contact surface between the second-stage planetary gear and the second-stage sun gear to lubricate and cool them, and finally the lubricating oil flows to the bottom and flows back to the oil tank through the outlet.

7. The device for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 6, characterized in that: The parallel-stage gear train tooth surface lubrication system includes a plurality of parallel-stage gear train tooth surface lubrication nozzles fixed on the outer casing. The parallel-stage gear train tooth surface lubrication nozzles are located on both sides of the meshing position between the parallel-stage output shaft gear and the rear end gear of the parallel-stage planetary carrier, and are used to lubricate and cool the area near the contact between the parallel-stage output shaft and the parallel-stage planetary carrier. The parallel-stage gear train tooth surface lubrication nozzles are connected to the corresponding pump oil outlet of the eighth lubrication power system; the lubricating oil flows from the pump oil outlet of the eighth lubrication power system to the parallel-stage gear train tooth surface lubrication nozzles to lubricate the meshing position between the parallel-stage output shaft gear and the rear end gear of the parallel-stage planetary carrier. Under the rotation of the parallel-stage output shaft and the parallel-stage planetary carrier, the lubricating oil flows into the bottom and flows back to the oil tank through the outlet.

8. The device for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 7, characterized in that: The first lubrication power system, the second lubrication power system, the third lubrication power system, the fourth lubrication power system, the fifth lubrication power system, the sixth lubrication power system, the seventh lubrication power system and the eighth lubrication power system have the same structure and all include a motor, a pump, an oil pipeline and a pump oil outlet; each nozzle is connected to the corresponding pump oil outlet, the pump and the oil tank are connected through the oil pipeline, the motor provides power to the pump, and the signal processor controls the motor speed according to the received PWM control signal, thereby adjusting the flow rate of the pump oil outlet.

9. A method for automatically monitoring and controlling lubrication of a wind turbine transmission system, which is implemented based on the device for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 8, characterized in that: The following steps are involved: Step 1: Establish a communication protocol and set up a 4G / 5G / WIFI multi-mode communication module; configure the MQTT protocol to connect to the cloud platform and set a 15-second heartbeat packet interval; establish a unique device identification code, including geographic location information; perform a power-on self-test function: use a 5-second pulse no-load test to test the performance of each lubrication power system motor; perform zero-point calibration on the optical fiber speed sensor, spindle front-end temperature sensor, spindle rear-end temperature sensor, parallel-stage planetary frame rear-end temperature sensor, second-stage planetary frame front-end temperature sensor, and second-stage planetary frame rear-end temperature sensor; use a 30-second pressure hold to test the attenuation of the lubricating oil pipeline pressure and make timely adjustments; synchronize the parameters to the cloud; Step 2: The optical fiber speed sensor monitors the spindle speed in real time. The spindle front temperature sensor, the spindle rear temperature sensor, the parallel stage planetary frame rear temperature sensor, the second stage planetary frame front temperature sensor and the second stage planetary frame rear temperature sensor monitor the temperature values ​​of the corresponding positions in real time. The pumps of the 8 lubrication power systems are monitored in real time. The flow setting value is monitored in real time. The monitored data is pre-processed with a cycle of 200ms and stored in a local SD card. Step 3: The signal processor calculates the transmission ratio according to the number of gear teeth, and calculates the rotation speed of each component to determine whether the rotation speed is greater than the corresponding working speed threshold of each component. If so, proceed to step 4, otherwise return to continue to determine the rotation speed; Step 4: The signal processor determines whether the temperature at each position is greater than the operating temperature. If so, it proceeds to step 5, otherwise it returns to continue determining the temperature; Step 5: The signal processor sends PWM control signals to the first lubrication power system, the second lubrication power system, the third lubrication power system, the fourth lubrication power system, the fifth lubrication power system, the sixth lubrication power system, the seventh lubrication power system, and the eighth lubrication power system respectively according to the received signals to increase or decrease the lubricating oil flow at different positions; the cloud platform provides a three-dimensional gearbox lubrication heat map, historical data trend analysis to support year-on-year / month-on-month comparison, and triple verification of key alarm parameters; Step 6: The signal processor pushes the results to the site, cloud platform and mobile terminal simultaneously. The control range of the site is full-function control, the control range of the cloud platform is speed, temperature and flow parameter adjustment and the start and stop of the entire system, and the control range of the mobile terminal is to monitor various states.

10. The method for automatically monitoring and controlling lubrication of a wind turbine transmission system according to claim 9, characterized in that: In step 4, a temperature buffer zone is set according to Automatically adjust ΔT(t), where T is temperature and t is time. ΔT(t) refers to a function of temperature variation over time to prevent temperature fluctuations from causing frequent responses of the pump of the lubrication power system; determine the buffer zone temperature, and when the temperature at a certain position is greater than the buffer zone start temperature at that position, increase the linear flow rate of the lubricating oil, otherwise continue to determine, and if the buffer zone temperature at that position is less than the buffer zone stop temperature at that position, reduce the linear flow rate of the lubricating oil, otherwise maintain the current lubricating oil flow rate; in the step five, set graded control for the flow rate of the lubricating oil, on the one hand, use nonlinear regulation, and on the other hand, set speed compensation for the first-stage planetary gear and the second-stage planetary gear to reduce the deviation from the actual speed.

Images