Active lubrication system and method with fault diagnosis function

Abstract

The invention relates to an active lubricating system and method with fault diagnosis, a radiator, a first composition plate and a second composition plate are respectively arranged on the peripheral side of a lubricating oil tank, and a rough filter is mounted at the bottom of the lubricating oil tank; a main oil pump and a backup oil pump on the first combination plate are respectively connected with a first electromagnetic directional valve and a first valve block pipeline, and a rough filter is connected with the first electromagnetic directional valve pipeline; the main fine filter and the backup fine filter on the second combination plate are respectively connected with a second electromagnetic directional valve and a second valve block pipeline, the first valve block and the second electromagnetic directional valve are respectively connected with a radiator pipeline, and the second valve block is connected with a gearbox pipeline; the system collects and analyzes signals of all parts and sensors in real time through the controller, quickly determines the fault occurrence position, and displays the system state and fault information by controlling the fault indicating lamp and the buzzer, so that maintenance personnel can conveniently and timely know the working state of the system and take corresponding measures, and the maintenance efficiency is improved. The controller can be automatically switched to the backup assembly when monitoring that the oil pump and the fine filter in the system break down.

Description

Technical Field

[0001] The present invention belongs to the technical field of lubrication of gear transmission systems, and relates to an active lubrication system and method with fault diagnosis, and particularly to an active lubrication system with fault diagnosis applicable to high-speed gear transmission systems and its fault diagnosis method and lubrication method. Background Art

[0002] For high-speed gear transmission systems, rotors such as gears and bearings have relatively high linear speeds. Conventional splash lubrication will generate relatively large splash losses. Due to the strong centrifugal force during splash lubrication, the volume fraction of lubricating oil on the tooth surface and the inner ring of the bearing is relatively low, and it is difficult to form an effective lubricating oil film. Under such working conditions, it is usually necessary to arrange corresponding nozzle or spray ring structures to perform pressure forced oil injection lubrication on the meshing point and the bearing. By reasonably designing parameters such as the injection angle, injection pressure, and injection speed, it is ensured that all relative friction surfaces can be in a fully lubricated state. And for systems with relatively large transmitted power and long operating time, in order to avoid the system temperature being too high and affecting the material performance, it is also necessary to externally install an independent lubrication system to cool and filter the lubricating oil to improve the operating life of the system.

[0003] However, compared with conventional splash lubrication, the externally installed active lubrication system has more accessories and a more complex internal structure, and its failure frequency is also higher. When a key component of the lubricating oil system fails, it is basically necessary to immediately stop the machine for maintenance. Maintenance personnel often cannot immediately find the failure point, and need to gradually check to find the cause of the failure. For systems that need to operate stably for a long time, equipment shutdown may have a greater impact on the production rhythm, and the long maintenance time also greatly reduces the production efficiency. Therefore, an active lubrication system with fault diagnosis is needed, which can quickly find the cause of the failure and locate the specific failure point when a failure occurs, so as to improve the maintenance efficiency. At the same time, all key components of the lubricating oil system have backups, and can automatically switch to the backup components when a failure occurs, without stopping the machine unless necessary, to improve the reliability and stability of the lubricating oil system. Summary of the Invention

[0004] In view of this, in order to solve the problems that the complex internal structure of the existing externally installed active lubrication system leads to a high failure frequency, and when a failure occurs, it is basically necessary to immediately stop the machine for troubleshooting and maintenance. For systems that need to operate stably for a long time, equipment shutdown will have a greater impact on the production rhythm and reduce the production efficiency, the present invention provides an active lubrication system and method with fault diagnosis.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An active lubrication system with fault diagnosis, where the lubricating oil tank is fixedly installed below the gearbox. On the circumferential side of the lubricating oil tank, a radiator, a first combined plate facilitating the installation of oil supply equipment, and a second combined plate facilitating the installation of filtering equipment are respectively provided. A coarse filter is installed at the bottom of the lubricating oil tank;

[0007] On the first combined plate, a main oil pump, a backup oil pump, a first electromagnetic directional valve, and a first valve block are fixedly installed. The main oil pump is respectively connected to the first electromagnetic directional valve and the first valve block through pipelines. The backup oil pump is respectively connected to the first electromagnetic directional valve and the first valve block through pipelines. The first valve block is connected to the radiator through a pipeline. The coarse filter is connected to the first electromagnetic directional valve through a pipeline;

[0008] On the second combined plate, a main fine filter, a backup fine filter, a second electromagnetic directional valve, a second valve block, and a controller are fixedly installed. The main fine filter is respectively connected to the second electromagnetic directional valve and the second valve block through pipelines. The backup fine filter is respectively connected to the second electromagnetic directional valve and the second valve block through pipelines. The second electromagnetic directional valve is connected to the radiator through a pipeline. The second valve block is connected to the gearbox through a pipeline.

[0009] Furthermore, the first electromagnetic directional valve is fixedly installed on the first combined plate outside the main oil pump, and the first valve block is fixedly installed on the first combined plate outside the backup oil pump; the second electromagnetic directional valve is fixedly installed on the second combined plate outside the main fine filter, and the second valve block is fixedly installed on the second combined plate outside the backup fine filter.

[0010] Furthermore, a first one-way valve group and a first pressure sensor are respectively sealed and installed on the first valve block through combined washers, and a second one-way valve group and a second pressure sensor are sealed and installed on the second valve block through combined washers.

[0011] Furthermore, an oil window and a first temperature sensor are fixedly installed on the lubricating oil tank, and a second temperature sensor is fixedly installed on the gearbox.

[0012] Furthermore, differential pressure gauges are respectively installed on the main fine filter and the backup fine filter to facilitate directly reading the inlet and outlet differential pressures of the main fine filter and the backup fine filter. Differential pressure gauges are respectively installed on the coarse filter to facilitate directly reading the inlet and outlet differential pressures of the coarse filter.

[0013] Furthermore, the controller includes a signal collection module, a parameter setting and data processing module, an output module, a first contactor, a second contactor, an intermediate relay, a fault indicator light Ⅰ, a fault indicator light Ⅱ, a fault indicator light Ⅲ, a buzzer, and a stop switch. The signal collection module receives the sensor signals of each component and is connected to the parameter setting and data processing module. The parameter setting and data processing module is externally connected to the output module, and the output module is connected to the first contactor, the second contactor, the intermediate relay, the fault indicator light Ⅰ, the fault indicator light Ⅱ, the fault indicator light Ⅲ, the buzzer, and the stop switch.

[0014] Further, the sensor signals of each component received by the signal collection module in the controller include the differential pressure signal collected by the differential pressure gauge on the coarse filter, the differential pressure signal collected by the differential pressure gauge on the main fine filter, the differential pressure signal collected by the differential pressure gauge on the backup fine filter, the temperature data collected by the first temperature sensor, the temperature data collected by the second temperature sensor, the pressure data collected by the first pressure sensor, and the pressure data collected by the second pressure sensor.

[0015] The parameter setting and data processing module in the controller sets each parameter threshold, and then compares the data obtained by the signal collection module with the threshold to output corresponding signal data.

[0016] The output signals of the output module in the controller include the first contactor signal for controlling the first electromagnetic directional valve, the second contactor signal for controlling the second electromagnetic directional valve, the relay signal for controlling the main oil pump and the backup oil pump, the signals for controlling the fault indicator light Ⅰ, fault indicator light Ⅱ, fault indicator light Ⅲ, the buzzer, and the stop switch.

[0017] The lubrication method of the active lubrication system with fault diagnosis includes the following steps:

[0018] S1. The controller determines, according to the output signal of the system state, that any one of the main oil pump or the backup oil pump and any one of the main fine filter or the backup fine filter are in the working state, and at the same time, the first electromagnetic directional valve and the second electromagnetic directional valve are in the corresponding working positions;

[0019] S2. When the oil pump is working, the oil inside the lubricating oil tank is filtered by the coarse filter and then enters the first electromagnetic directional valve, and then enters the inlet of the working oil pump. The lubricating oil at the outlet of the working oil pump enters the inlet of the radiator through the first valve block, is cooled by the radiator, and then flows out of the radiator outlet, passes through the second electromagnetic directional valve, and then is filtered by the working fine filter and flows through the second valve block to the inlet of the gearbox to provide lubrication for the internal gears, bearings, etc. of the gear transmission system. The lubricating oil flows back to the lubricating oil tank through the oil return hole and oil return pipeline of the gearbox under the action of gravity;

[0020] S3. When the main oil pump fails, start the backup oil pump to supply lubricating oil for the gear transmission system, and synchronously replace the main oil pump. The lubrication method is the same as that in step S2. When the main fine filter fails, start the backup fine filter to filter the oil for the gear transmission system, and synchronously replace the main fine filter. The lubrication method is the same as that in step S2.

[0021] The fault diagnosis method of the active lubrication system with fault diagnosis includes the following steps:

[0022] S1. After the first pressure sensor and the second pressure sensor are respectively less than the set pressure threshold, it is determined that the main oil pump fails. At this time, the main oil pump is powered off, the first electromagnetic directional valve and the backup oil pump are powered on, the fault indicator light Ⅰ is always on and the buzzer alarms; after replacing the main oil pump, press the reset button, and the system resumes the power-on state of the main oil pump, the fault indicator light Ⅰ and the buzzer are turned off, and the first check valve group ensures that the system will not leak when replacing the oil pump;

[0023] S2. When the pressure difference between the inlet and outlet of the main fine filter is greater than the threshold value, its built-in transmitter outputs a signal to the controller. At this time, the second electromagnetic directional valve is powered on, and the oil is filtered through the backup fine filter. The fault indicator light Ⅱ is always on and the buzzer alarms; after replacing the main fine filter, press the reset button, and the system resumes the filtering state of the main fine filter, the fault indicator light Ⅱ and the buzzer are turned off, and the second check valve group ensures that the system will not leak when replacing the fine filter;

[0024] S3. After the first pressure sensor is less than the set threshold value and the second pressure sensor is greater than the set threshold value, it is determined that the radiator is blocked. At this time, the entire system stops, the fault indicator light Ⅲ is always on and the buzzer alarms;

[0025] S4. After the first pressure sensor and the second pressure sensor are respectively greater than the set pressure threshold value, it is determined that the oil passage inside the gearbox is blocked. At this time, the entire system stops and the buzzer alarms;

[0026] S5. After the first temperature sensor and the second temperature sensor are respectively greater than the set temperature threshold value, it is determined that the radiator fails or abnormal wear occurs inside the gearbox. At this time, the entire system stops, the fault indicator light Ⅰ, the fault indicator light Ⅱ, and the fault indicator light Ⅲ are always on, and the buzzer alarms;

[0027] S6. When the pressure difference between the inlet and outlet of the coarse filter is greater than the threshold value, its built-in transmitter outputs a signal to the controller. At this time, the fault indicator light Ⅱ and the fault indicator light Ⅲ are always on and the buzzer alarms.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1. The active lubrication system with fault diagnosis disclosed by the present invention can collect and analyze the signals of various components and sensors in real time through a controller, quickly determine the specific type and occurrence location of faults, such as main oil pump faults, main fine filter blockage, radiator blockage, etc., avoiding the traditional method of maintenance personnel gradually troubleshooting faults, and greatly shortening the fault diagnosis time. When a fault occurs, the system can automatically switch to backup components (such as backup oil pumps, backup fine filters) to continue working, without unnecessary shutdown, thus reducing the equipment downtime caused by faults, improving the utilization rate and production efficiency of the equipment, which is particularly important for systems that need to operate stably for a long time. At the same time, fast and accurate fault diagnosis also reduces the workload and maintenance time of maintenance personnel, and also reduces the risk of further damage to the equipment caused by untimely fault troubleshooting, thereby indirectly reducing the maintenance cost.

[0030] 2. The active lubrication system with fault diagnosis disclosed by the present invention is equipped with backups for key components such as the main oil pump and the main fine filter. When a main component fails, it can seamlessly switch to the backup component, ensuring the continuous and stable operation of the lubrication system, improving the overall reliability of the system, and reducing the risk of system failure caused by key component failures. The system sets corresponding automatic execution actions for different faults, such as power off, switching to backup, alarming, etc., and can take measures in a timely manner when a fault occurs to prevent the fault from further expanding, ensuring the safe operation of the system and enhancing the stability of the system. When replacing components such as the main oil pump or the main fine filter, the first check valve group and the second check valve group can ensure that the system will not leak, further improving the safety and reliability of the system and avoiding accidents caused by maintenance operations.

[0031] 3. The active lubrication system with fault diagnosis disclosed by the present invention, through a reasonably designed lubrication scheme, after a series of treatments such as coarse filtration, radiator cooling, and fine filtration of the lubricating oil, can provide sufficient and high-quality lubrication for key components such as gears and bearings inside the gearbox, effectively reducing the friction and wear between components, and improving the operation efficiency and service life of the equipment. The system is equipped with temperature sensors and pressure sensors, which can monitor the temperature and pressure of the lubricating oil in real time, and timely process abnormal situations through fault diagnosis logic to ensure that the lubricating oil is always in good working condition, further ensuring the lubrication effect and the normal operation of the equipment.

[0032] 4. The active lubrication system with fault diagnosis disclosed by the present invention has a controller integrated with functions such as signal collection, parameter setting, data processing, and output. It can centrally manage and monitor the entire lubrication system, and visually display the system status and fault information through a fault indicator light, buzzer, etc., facilitating the operator to promptly understand the system operation conditions and take corresponding measures. The connection methods of various components in the system (such as bolt connection, installation with combined gaskets for sealing, etc.) are convenient for maintenance personnel to disassemble and replace components. At the same time, the design of backup components also provides greater flexibility for maintenance work, further improving the maintainability of the system.

[0033] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. Brief Description of the Drawings

[0034] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0035] Figure 1 is the part layout diagram of the active lubrication system with fault diagnosis of the present invention;

[0036] Figure 2 is the schematic diagram of the lubrication scheme of the active lubrication system with fault diagnosis of the present invention;

[0037] Figure 3 is the schematic diagram of the fault diagnosis system of the active lubrication system with fault diagnosis of the present invention.

[0038] Reference Signs: 1, lubricating oil tank; 2, oil window; 3, first temperature sensor; 4, coarse filter; 5, first combined plate; 6, first electromagnetic directional valve; 7, main oil pump; 8, backup oil pump; 9, first valve block; 10, first check valve group; 11, first pressure sensor; 12, radiator; 13, second combined plate; 14, second electromagnetic directional valve; 15, main fine filter; 16, backup fine filter; 17, second valve block; 18, second check valve group; 19, second pressure sensor; 20, controller; 21, gearbox; 22, second temperature sensor; 23, oil seal. Detailed Description of the Preferred Embodiment

[0039] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0040] As Figures 1 - 2 shown, an active lubrication system with fault diagnosis. The lubricating oil tank 1 is fixedly installed below the gearbox 21 by bolts, and the gearbox 21 and the lubricating oil tank 1 are hermetically connected through a oil seal 23. On both sides of the lubricating oil tank 1, a first combination plate 5 for facilitating the installation of the oil supply device and a second combination plate 13 for facilitating the installation of the filtering device are respectively provided. A radiator 12 is provided on the front side of the lubricating oil tank 1. An oil window 2, a first temperature sensor 3 and a coarse filter 4 are fixedly installed on the lubricating oil tank 1 by bolts, and a second temperature sensor 22 is fixedly installed on the gearbox 21 by bolts.

[0041] A main oil pump 7 and a backup oil pump 8 are fixedly installed on the first combination plate 5 by bolts. A first electromagnetic reversing valve 6 is fixedly installed on the first combination plate 5 outside the main oil pump 7 by bolts. A first valve block 9 is fixedly installed on the first combination plate 5 outside the backup oil pump 8 by bolts. The main oil pump 7 is respectively connected to the first electromagnetic reversing valve 6 and the first valve block 9 through pipelines. At the same time, the backup oil pump 8 is also respectively connected to the first electromagnetic reversing valve 6 and the first valve block 9 through pipelines. A first one-way valve group 10 and a first pressure sensor 11 are respectively installed on the first valve block 9 by sealing with a combined gasket. The first valve block 9 is connected to the radiator 12 through a pipeline. The coarse filter 4 is connected to the first electromagnetic reversing valve 6 through a pipeline.

[0042] A main fine filter 15, a backup fine filter 16 and a controller 20 are fixedly installed on the second combination plate 13 by bolts. A second electromagnetic reversing valve 14 is fixedly installed on the second combination plate 13 outside the main fine filter 15 by bolts. A second valve block 17 is fixedly installed on the second combination plate 13 outside the backup fine filter 16 by bolts. The main fine filter 15 is respectively connected to the second electromagnetic reversing valve 14 and the second valve block 17 through pipelines. At the same time, the backup fine filter 16 is also respectively connected to the second electromagnetic reversing valve 14 and the second valve block 17 through pipelines. A second one-way valve group 18 and a second pressure sensor 19 are installed on the second valve block 17 by sealing with a combined gasket. The second electromagnetic reversing valve 14 is connected to the radiator 12 through a pipeline. The second valve block 17 is connected to the gearbox 21 through a pipeline.

[0043] Differential pressure gauges are respectively installed on the main fine filter 15 and the backup fine filter 16, facilitating direct reading of the inlet and outlet differential pressures of the main fine filter 15 and the backup fine filter 16. Differential pressure gauges are respectively installed on the coarse filter 4, facilitating direct reading of the inlet and outlet differential pressures of the coarse filter 4.

[0044] The controller 20 determines the working status of each component by collecting and analyzing the signals of each component and sensor in real time, and automatically executes corresponding actions for each fault.

[0045] As Figure 3 shown, the controller 20 includes a signal collection module, a parameter setting and data processing module, an output module, a first contactor, a second contactor, an intermediate relay, a fault indicator I, a fault indicator II, a fault indicator III, a buzzer, and a shutdown switch. The signal collection module receives the signals of the sensors of each component and is connected to the parameter setting and data processing module. The parameter setting and data processing module is externally connected to the output module, and the output module is connected to the first contactor, the second contactor, the intermediate relay, the fault indicator I, the fault indicator II, the fault indicator III, the buzzer, and the shutdown switch.

[0046] The signals of the sensors of each component received by the signal collection module in the controller 20 include the differential pressure signal collected by the differential pressure gauge on the coarse filter 4, the differential pressure signal collected by the differential pressure gauge on the main fine filter 15, the differential pressure signal collected by the differential pressure gauge on the backup fine filter 16, the temperature data collected by the first temperature sensor 3, the temperature data collected by the second temperature sensor 22, the pressure data collected by the first pressure sensor 11, and the pressure data collected by the second pressure sensor 19.

[0047] The parameter setting and data processing module in the controller 20 sets the parameter thresholds, and then compares the data obtained by the signal collection module with the thresholds to output corresponding signal data.

[0048] The output signals of the output module in the controller 20 include the first contactor signal for controlling the first electromagnetic directional valve 6, the second contactor signal for controlling the second electromagnetic directional valve 14, the relay signal for controlling the main oil pump 7 and the backup oil pump 8, and the signals for controlling the fault indicator I, the fault indicator II, the fault indicator III, the buzzer, and the shutdown switch.

[0049] The lubrication method of the active lubrication system with fault diagnosis includes the following steps:

[0050] S1. The controller 20 determines, according to the output signal of the system state, that any one of the main oil pump 7 and the backup oil pump 8 and any one of the main fine filter 15 and the backup fine filter 16 are in the working state, and at the same time, the first electromagnetic directional valve 6 and the second electromagnetic directional valve 14 are in the corresponding working positions;

[0051] S2. When the oil pump is working, the oil in the lubricating oil tank 1 passes through the coarse filter 4 and then enters the first electromagnetic directional valve 6, and then enters the inlet of the working oil pump. The lubricating oil at the outlet of the working oil pump enters the inlet of the radiator 12 through the first valve block 9. After being cooled by the radiator 12, it flows out of the outlet of the radiator 12, passes through the second electromagnetic directional valve 14, and then passes through the working fine filter and flows through the second valve block 17 to the inlet of the gearbox 21 to lubricate the internal gears, bearings, etc. of the gear transmission system. The lubricating oil flows back to the lubricating oil tank 1 through the oil return hole and oil return pipeline of the gearbox 21 under the action of gravity;

[0052] S3. When the main oil pump 7 fails, start the backup oil pump 8 to supply lubricating oil for the gear transmission system, and synchronously replace the main oil pump 7. The lubrication method is the same as that in step S2. When the main fine filter 15 fails, start the backup fine filter 16 to filter the oil for the gear transmission system, and synchronously replace the main fine filter 15. The lubrication method is the same as that in step S2.

[0053] The fault diagnosis method of the active lubrication system with fault diagnosis includes the following steps:

[0054] S1. After the first pressure sensor 11 and the second pressure sensor 19 are respectively less than the set pressure thresholds, it is determined that the main oil pump 7 fails. At this time, the main oil pump 7 is powered off, and the first electromagnetic directional valve 6 and the backup oil pump 8 are powered on. The fault indicator I is always on and the buzzer alarms. After replacing the main oil pump 7, press the reset button, and the system resumes the power-on state of the main oil pump 7. The fault indicator I and the buzzer are turned off. The first one-way valve group 10 ensures that the system will not leak when replacing the oil pump;

[0055] S2. When the pressure difference between the inlet and outlet of the main fine filter 15 is greater than the threshold value, its built-in transmitter outputs a signal to the controller 20. At this time, the second electromagnetic directional valve 14 is powered on, and the oil is filtered through the backup fine filter 16. The fault indicator II is always on and the buzzer alarms. After replacing the main fine filter 15, press the reset button, and the system resumes the filtering state of the main fine filter 15. The fault indicator II and the buzzer are turned off. The second one-way valve group 18 ensures that the system will not leak when replacing the fine filter 15;

[0056] S3. After the first pressure sensor 11 is less than the set threshold value and the second pressure sensor 19 is greater than the set threshold value, it is determined that the radiator 12 is blocked. At this time, the entire system stops, and the fault indicator III is always on and the buzzer alarms;

[0057] S4. After the first pressure sensor 11 and the second pressure sensor 19 are respectively greater than the set pressure thresholds, it is determined that the oil passage inside the gearbox 21 is blocked. At this time, the entire system stops and the buzzer alarms;

[0058] S5. After the first temperature sensor 3 and the second temperature sensor 22 are respectively greater than the set temperature threshold, it is determined that there is a failure of the radiator 12 or abnormal wear inside the gearbox 21. At this time, the entire system shuts down, and the fault indicator I, fault indicator II, and fault indicator III are constantly on, and the buzzer alarms.

[0059] S6. After the pressure difference between the inlet and outlet of the coarse filter 4 is greater than the threshold value, its built-in transmitter outputs a signal to the controller 20. At this time, the fault indicator II and the fault indicator III are constantly on and the buzzer alarms.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An active lubrication system with fault diagnosis, wherein a lubricating oil tank (1) is fixedly installed below a gear box (21), characterized in that: A radiator (12), a first assembly plate (5) for facilitating installation of oil supply equipment, and a second assembly plate (13) for facilitating installation of filtering equipment are respectively arranged on the periphery of the lubricating oil tank (1), and a coarse filter (4) is installed at the bottom of the lubricating oil tank (1); A first electromagnetic reversing valve (6), a main oil pump (7), a backup oil pump (8), and a first valve block (9) are fixedly mounted on the first assembly plate (5); the main oil pump (7) is connected to the first electromagnetic reversing valve (6) and the first valve block (9) by pipelines, the backup oil pump (8) is connected to the first electromagnetic reversing valve (6) and the first valve block (9) by pipelines, the first valve block (9) is connected to the radiator (12) by pipeline, and the coarse filter (4) is connected to the first electromagnetic reversing valve (6) by pipeline; A second electromagnetic reversing valve (14), a main fine filter (15), a backup fine filter (16), a second valve block (17) and a controller (20) are fixedly mounted on the second assembly plate (13); the main fine filter (15) is connected to the second electromagnetic reversing valve (14) and the second valve block (17) by pipelines, the backup fine filter (16) is connected to the second electromagnetic reversing valve (14) and the second valve block (17) by pipelines, the second electromagnetic reversing valve (14) is connected to the radiator (12) by pipeline, and the second valve block (17) is connected to the gear box (21) by pipeline.

2. The active lubrication system with fault diagnosis as claimed in claim 1, characterized in that: The first electromagnetic reversing valve (6) is fixedly mounted on a first combination plate (5) outside the main oil pump (7), and the first valve block (9) is fixedly mounted on the first combination plate (5) outside the backup oil pump (8); the second electromagnetic reversing valve (14) is fixedly mounted on a second combination plate (13) outside the main fine filter (15), and the second valve block (17) is fixedly mounted on the second combination plate (13) outside the backup fine filter (16).

3. The active lubrication system with fault diagnosis as claimed in claim 1, characterized in that: The first one-way valve group (10) and the first pressure sensor (11) are respectively installed on the first valve block (9) through a combined gasket seal, and the second one-way valve group (18) and the second pressure sensor (19) are respectively installed on the second valve block (17) through a combined gasket seal.

4. The active lubrication system with fault diagnosis as claimed in claim 3, characterized in that: An oil window (2) and a first temperature sensor (3) are fixedly mounted on the lubricating oil tank (1), and a second temperature sensor (22) is fixedly mounted on the gear box (21).

5. The active lubrication system with fault diagnosis as claimed in claim 4, characterized in that: The main fine filter (15) and the backup fine filter (16) are respectively equipped with a differential pressure gauge to facilitate direct reading of the inlet and outlet differential pressures of the main fine filter (15) and the backup fine filter (16); and the coarse filter (4) is respectively equipped with a differential pressure gauge to facilitate direct reading of the inlet and outlet differential pressures of the coarse filter (4).

6. The active lubrication system with fault diagnosis as claimed in claim 5, characterized in that: The controller (20) comprises a signal collection module, a parameter setting and data processing module, an output module, a first contactor, a second contactor, an intermediate relay, a fault indicator light I, a fault indicator light II, a fault indicator light III, a buzzer, and a shutdown switch. The signal collection module receives sensor signals of various components and is connected to the parameter setting and data processing module. The parameter setting and data processing module is externally connected to the output module. The output module is connected to the first contactor, the second contactor, the intermediate relay, the fault indicator light I, the fault indicator light II, the fault indicator light III, the buzzer, and the shutdown switch.

7. The active lubrication system with fault diagnosis as claimed in claim 6, characterized in that: The sensor signals of various components received by the signal collection module in the controller (20) include a differential pressure signal collected by a differential pressure gauge on a coarse filter (4), a differential pressure signal collected by a differential pressure gauge on a main fine filter (15), a differential pressure signal collected by a differential pressure gauge on a backup fine filter (16), temperature data collected by a first temperature sensor (3), temperature data collected by a second temperature sensor (22), pressure data collected by a first pressure sensor (11), and pressure data collected by a second pressure sensor (19); The parameter setting and data processing module in the controller (20) sets the threshold of each parameter, and then compares the data obtained by the signal collection module with the threshold to output corresponding signal data; The output module in the controller (20) outputs signals including a first contactor signal for controlling the first electromagnetic reversing valve (6), a second contactor signal for controlling the second electromagnetic reversing valve (14), a relay signal for controlling the main oil pump (7) and the backup oil pump (8), and signals for controlling the fault indicator light I, the fault indicator light II, the fault indicator light III, the buzzer, and the shutdown switch.

8. The lubrication method of the active lubrication system with fault diagnosis as claimed in claim 7, characterized in that: The steps include: S1, the controller (20) determines, according to the system state output signal, that any one of the main oil pump (7) or the backup oil pump (8), and any one of the main fine filter (15) or the backup fine filter (16) are in an operating state, and at the same time, the first electromagnetic reversing valve (6) and the second electromagnetic reversing valve (14) are in corresponding working positions; S2, when the oil pump is working, the oil in the lubricating oil tank (1) is filtered by the coarse filter (4) and then enters the first electromagnetic reversing valve (6), and then enters the oil inlet of the working state oil pump. The lubricating oil at the outlet of the working state oil pump enters the inlet of the radiator (12) through the first valve block (9), and after being cooled by the radiator (12), flows from the outlet of the radiator (12) through the second electromagnetic reversing valve (14), and then passes through the working state fine filter and then flows through the second valve block (17) to the oil inlet of the gear box (21) to supply oil and lubrication to the gear transmission system. The lubricating oil flows back to the lubricating oil tank (1) through the oil return hole and the oil return pipeline of the gear box (21) under the action of gravity; S3. When the main oil pump (7) fails, the backup oil pump (8) is started to supply oil for lubrication of the gear transmission system, and the main oil pump (7) is replaced simultaneously. The lubrication method is the same as step S2. When the main fine filter (15) fails, the backup fine filter (16) is started to filter oil for lubrication of the gear transmission system, and the main fine filter (15) is replaced simultaneously. The lubrication method is the same as step S2.

9. The fault diagnosis method of the active lubrication system with fault diagnosis as claimed in claim 7, characterized in that: The steps include: S1. When the pressures of the first pressure sensor (11) and the second pressure sensor (19) are respectively lower than the set pressure thresholds, it is determined that the main oil pump (7) is faulty. At this time, the main oil pump (7) is powered off, the first electromagnetic reversing valve (6) and the backup oil pump (8) are powered on, the fault indicator light I is always on and a buzzer alarm sounds. After the main oil pump (7) is replaced and the reset button is pressed, the system is restored to the state where the main oil pump (7) is powered on. S2. When the inlet and outlet pressure difference of the main fine filter (15) is greater than the threshold value, its built-in transmitter outputs a signal to the controller (20). At this time, the second electromagnetic reversing valve (14) is energized, and the oil is filtered through the backup fine filter (16). The fault indicator light II is always on and the buzzer alarms. After the main fine filter (15) is replaced and the reset button is pressed, the system returns to the filtering state of the main fine filter (15). S3, when the first pressure sensor (11) is less than a set threshold and the second pressure sensor (19) is greater than a set threshold, it is determined that the radiator (12) is blocked, at which point the entire system shuts down, the fault indicator light III is always on, and a buzzer alarm sounds; S4, when the first pressure sensor (11) and the second pressure sensor (19) are respectively greater than the set pressure thresholds, it is determined that the internal oil passage of the gearbox (21) is blocked, and the entire system is shut down and a buzzer alarm is sounded; S5, when the temperature of the first temperature sensor (3) and the second temperature sensor (22) are respectively greater than the set temperature threshold, it is determined that the radiator (12) is faulty or abnormal wear occurs inside the gearbox (21), and the entire system is shut down, the fault indicator lights I, II and III are always on, and a buzzer alarm is sounded; S6. When the pressure difference between the inlet and outlet of the coarse filter (4) is greater than the threshold value, its built-in transmitter outputs a signal to the controller (20). At this time, the fault indicator lights II and III are always on and the buzzer alarms.

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