A control alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine

Abstract

The present invention relates to the technical field of oil leakage control and alarm devices, and in particular to a control and alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine generator set, which is convenient for timely alarming of oil leakage, effectively saving the amount of lubricating oil used in the gearbox, and improving the reliability of the device's oil penetration alarm; the device comprises a shell, an alarm and a support tube, the alarm is installed at the bottom of the shell, the support tube is connected and arranged at the top of the alarm, an oil inlet is provided at the lower rear end of the shell, and the oil inlet is connected to the gearbox through a pipeline; the device also comprises a displacement sensor, an alarm sensing mechanism, a float, a first magnetic block, a connecting seat and a test platform, the displacement sensor is installed at the top of the shell, the alarm sensing mechanism is installed at the upper inner part of the support tube, and the alarm sensing mechanism is electrically connected to the alarm, the float is slid up and down inside the shell, the connecting seat is installed at the bottom of the shell, the connecting seat is electrically connected to the alarm, and the alarm and the displacement sensor are electrically connected.

Description

Technical Field

[0001] The present invention relates to the technical field of oil leakage control and alarm devices, and in particular to a control and alarm device for reducing lubricating oil leakage in a gear box of a wind turbine generator set. Background Art

[0002] The wind turbine gearbox oil level gauge is a device installed on the outside of the gearbox body. Its function is to detect the internal oil level. The wind farm gearbox oil level can only be judged by the naked eye, but cannot obtain accurate data. It is difficult to determine whether the gearbox is short of oil. The alarm of the original oil level gauge is low in sensitivity and has poor performance. According to actual experience, the oil volume of the entire gearbox is about 340L under normal circumstances. When the gearbox oil loss is about 80L, the unit alarm will sound. The loss ratio is close to 17%, which is a relatively large loss.

[0003] And in the prior art CN202022987985.5, the device includes a pump body, a first connecting pipe is fixedly installed on the upper end of the pump body, and a second connecting pipe is fixedly installed on the lower end of the pump body, the first connecting pipe and the second connecting pipe are both connected to the interior of the pump body, one end of the first connecting pipe and the second connecting pipe is fixedly installed with a hollow pipe, and a float is placed inside the hollow pipe, a threaded rod is fixedly installed between the first connecting pipe and the second connecting pipe, and an alarm device is sleeved on the threaded rod, and the liquid level of the lubricating oil in the pump body can be visually observed through the hollow pipe to determine whether there is leakage; however, it was found during the use of the device that: the device relies on manual adjustment of the position of the alarm device by personnel, and lacks a standard value for the alarm adjustment, resulting in low alarm accuracy of the device, and is extremely prone to operational errors, etc., and the device has a single method of sensing the movement of 09 and poor reliability;

[0004] Therefore, it is proposed to develop an innovative new type of wind turbine gearbox oil level gauge to solve the problems of excessive oil leakage in the gearbox, pollution of the wind turbine, relatively increased economic losses, and serious impact on the reliability of the unit caused by the low alarm position and low sensitivity of the crude oil level gauge during on-site application. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a control alarm device for reducing gearbox lubricating oil leakage for wind turbines, which is convenient for timely alarming of oil leakage, effectively saves the amount of gearbox lubricating oil used, and improves the reliability of the device's oil penetration alarm.

[0006] The invention provides a control alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine generator system, comprising a housing, an alarm and a support tube, the alarm being mounted at the inner bottom of the housing, the support tube being connected to the top of the alarm, an oil inlet being arranged at the lower rear end of the housing, and the oil inlet being connected to the gearbox through a pipeline; the device also comprises a displacement sensor, an alarm sensing mechanism, a float, a first magnetic block, a connecting seat and a test platform, the displacement sensor being mounted at the inner top of the housing, the alarm sensing mechanism being mounted at the inner upper part of the support tube, and the alarm sensing mechanism being electrically connected to the alarm, the float sliding up and down being arranged inside the housing, the connecting seat being mounted at the bottom end of the housing, the connecting seat being electrically connected to the alarm, the alarm and the displacement sensor being electrically connected, and the connecting seat being electrically connected to an external main control system, the float being molded through the test platform, the first magnetic block being mounted at the lower part of the float after the mold is opened, and the test platform experimentally adjusts the weight of the float, the magnetic force of the first magnetic block and the length of the support tube respectively; the lubricating oil in the gearbox enters the interior of the housing through the pipeline, and at this time the liquid level height in the housing is equal to the lubricating oil level in the gearbox The float is suspended above the lubricating oil in the housing. At this time, the first magnetic block is located above the alarm sensing mechanism. When the lubricating oil in the gearbox leaks outward, the liquid level in the housing decreases at the same time, and the sinking of the float drives the first magnetic block to move downward. When the first magnetic block moves downward to the side of the alarm sensing mechanism, an alarm is triggered. The alarm sensing mechanism transmits a signal to the alarm, and the alarm sends the information to the main control system through the connecting seat to alarm. The weight of the float is increased and adjusted through the test platform to improve the sensitivity of the float during sinking. By increasing the magnetic force of the first magnetic block, the alarm sensing sensitivity between the first magnetic block and the alarm sensing mechanism is improved. By increasing the length of the support tube, the installation position of the alarm sensing mechanism is raised, and the initial distance between the first magnetic block and the alarm sensing mechanism is shortened, which facilitates timely alarm of oil leakage, effectively saving the amount of gearbox lubricating oil and reducing losses. At the same time, when the float sinks, the displacement sensor senses the movement of the float, and the displacement sensor alarms through the alarm, thereby improving the reliability of the device to oil penetration alarm.

[0007] Preferably, the alarm sensing mechanism includes a telescopic column, a second magnetic block, a tension spring, a connecting piece and two groups of metal plates. The fixed end of the telescopic column is installed on the upper part of the inner wall of the support tube, the second magnetic block is installed on the movable end of the telescopic column, the tension spring is fitted on the outer wall of the telescopic column, and one end of the tension spring is connected to the inner wall of the support tube, and the other end of the tension spring is connected to the outer wall of the second magnetic block. The connecting piece is installed on the outer wall of the second magnetic block, the first group of metal plates is installed at the end of the connecting piece, and the second group of metal plates is installed on the inner wall of the support tube. The two groups of metal plates are installed opposite to each other, and one group of metal plates is electrically connected to the alarm; when the float sinks and drives the first magnetic block to move to the side of the second magnetic block, a magnetic force is generated between the second magnetic block and the first magnetic block, and the second magnetic block moves under the influence of the magnetic force and drives the connecting piece and the left metal plate to move. After the left metal plate contacts the right metal plate, the power supply is connected, so that the alarm is turned on to alarm, thereby improving the convenience of the device to automatically alarm for oil leakage.

[0008] Preferably, the shell includes a base plate, a cover body, an observation window and two groups of bolts. An oil inlet is provided at the lower rear end of the base plate, and the oil inlet is connected to the gear box through a pipeline. The displacement sensor is installed at the top of the inner wall of the base plate, the alarm is installed at the bottom of the inner wall of the base plate, the cover body is installed at the upper part of the base plate, the float slides up and down and is arranged inside the base plate and the cover body, the observation window is set at the top of the cover body, the cover body and the base plate are fixedly connected by two groups of bolts, and through holes are respectively provided on the displacement sensor and the alarm, and the two groups of bolts pass through the through holes of the displacement sensor and the alarm respectively; the displacement sensor and the alarm are respectively installed at designated positions of the base plate, the cover body is installed on the outside of the base plate, and then the two groups of bolts are respectively passed through the displacement sensor and the alarm, so that the base plate, the cover body, the displacement sensor and the alarm are interconnected and fixed, thereby improving the convenience of installation or disassembly operation of the alarm device and improving the maintenance convenience of the alarm device. By setting the observation window, it is convenient to check the liquid level height in the cover body, thereby improving the convenience of use of the alarm.

[0009] Preferably, the mass of the float is increased from the standard 2.018g to 2.058g; after the mass of the float is increased, the sensitivity of the float during sinking is improved, and the alarm response is more agile.

[0010] Preferably, the magnetic force of the first magnetic block is adjusted from the original 0.21MT to 0.25MT; by increasing the magnetic strength of the first magnetic block, the magnetic field range is increased, and the magnetic field range of the alarm is improved.

[0011] Preferably, the length of the support tube is changed from the original 25mm to 75mm; according to the total height of the internal dimensions of the shell, the length of the support tube is extended to one-half of the inside of the shell, so as to facilitate raising the position height of the alarm sensing mechanism in the shell, shortening the initial distance between the alarm sensing mechanism and the first magnetic block, and reducing the stroke length required when the first magnetic block and the alarm sensing mechanism are close to each other to generate an alarm.

[0012] Preferably, the construction of the test platform includes the following steps:

[0013] Step 1: Processing and shaping: The float is shaped according to the inner diameter of the bottom plate and the cover. The weight of the float after processing is 2.0g to 3.0g;

[0014] Step 2, build a test bench: install the first magnetic block on the float, and place the float with the first magnetic block installed in a container filled with lubricating oil for a floating experiment. During the experiment, slowly drain or add the lubricating oil in the container, and observe the floating situation of the float at the same time. If the floating sensitivity of the float is found to be poor, return the float to step 1 for weight adjustment. After the floating sensitivity of the float meets the requirements, the float is molded and processed;

[0015] Step 3: Assemble the bottom plate, cover, float and first magnetic block to form the product;

[0016] Step 4: Build a test bench for the product: Install the product on the wind turbine gearbox to test the actual use effect;

[0017] Step 5: Comparative test: Through research and analysis of the characteristics of crude oil level gauges and their shortcomings in actual applications, an oil level alarm signal experiment was conducted on the two oil level gauges. The oil was filled to the entire oil level gauge window and then slowly released. The oil level gauge alarm signal was measured and the float alarm position was observed. The test data of this product was compared with the test results of the original product. The product was optimized and adjusted. The adjustments included the length of the support tube, the height position of the alarm sensing mechanism, and the magnetic strength of the first magnetic block. This solved the problem of excessive oil leakage in the gearbox caused by the low alarm position and low sensitivity of the crude oil level gauge during field application.

[0018] Step 6: Product molding; improving the practical application effect of the control alarm device.

[0019] Preferably, the installation position of the base plate is consistent with the installation position of the crude oil level gauge, which facilitates installation and debugging.

[0020] Compared with the prior art, the beneficial effects of the present invention are: by increasing the weight of the float through the test platform, the sensitivity of the float during the sinking process is improved; by increasing the magnetic force of the first magnetic block, the alarm sensing sensitivity between the first magnetic block and the alarm sensing mechanism is improved; by increasing the length of the support tube, the installation position of the alarm sensing mechanism is raised, and the initial distance between the first magnetic block and the alarm sensing mechanism is shortened, which is convenient for timely alarm of oil leakage, effectively saving the amount of gearbox lubricating oil and reducing losses; at the same time, when the float sinks, the displacement sensor senses the movement of the float, and the displacement sensor alarms through the alarm, thereby improving the reliability of the device's oil penetration alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an axonometric structural diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the axonometric partial structure of the connection between the float and the first magnetic block;

[0023] Figure 3 This is a schematic diagram of the axonometric local structure of the connection between the alarm and the support pipe;

[0024] Figure 4 is a schematic side view of a partial structure of the connection between the second magnetic block and the connecting piece, etc.;

[0025] Figure 5 It is a schematic diagram of the test platform construction process of the present invention;

[0026] Markings in the accompanying drawings: 1. Housing; 2. Displacement sensor; 3. Alarm; 4. Support tube; 5. Alarm sensing mechanism; 6. Float; 7. First magnetic block; 8. Connecting seat; 9. Base plate; 10. Cover; 11. Observation window; 12. Bolt; 13. Telescopic column; 14. Second magnetic block; 15. Tension spring; 16. Connecting piece; 17. Metal plate. DETAILED DESCRIPTION

[0027] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0028] Example 1

[0029] It includes a shell 1, an alarm 3 and a support tube 4. The alarm 3 is installed at the bottom of the shell 1. The support tube 4 is connected to the top of the alarm 3. An oil inlet is provided at the lower rear end of the shell 1, and the oil inlet is connected to the gear box through a pipeline. It also includes a displacement sensor 2, an alarm sensing mechanism 5, a float 6, a first magnetic block 7, a connecting seat 8 and a test platform. The displacement sensor 2 is installed at the top of the shell 1, the alarm sensing mechanism 5 is installed at the upper part of the support tube 4, and the alarm sensing mechanism 5 is electrically connected to the alarm 3. The float 6 is set inside the shell 1 for sliding up and down. The connecting seat 8 is installed at the bottom of the shell 1, the connecting seat 8 is electrically connected to the alarm 3, the alarm 3 and the displacement sensor 2 are electrically connected, and the connecting seat 8 is electrically connected to the external main control system. The float 6 is molded through the test platform, and the first magnetic block 7 is installed at the lower part of the float 6 after the mold is opened. The test platform experimentally adjusts the weight of the float 6, the magnetic force of the first magnetic block 7 and the length of the support tube 4 respectively; the lubricating oil in the gear box enters the inside of the shell 1 through the pipeline. At this time, the liquid level height in the shell 1 is consistent with the lubricating oil level height in the gear box, and the float 6 is suspended. Floating on the top of the lubricating oil in the housing 1, the first magnetic block 7 is located above the alarm sensing mechanism 5. When the lubricating oil in the gearbox leaks outward, the liquid level in the housing 1 decreases simultaneously, and the float 6 sinks, driving the first magnetic block 7 downward. When the first magnetic block 7 moves downward to the side of the alarm sensing mechanism 5, an alarm is triggered. The alarm sensing mechanism 5 transmits a signal to the alarm device 3, which sends the information to the main control system through the connecting socket 8 to issue an alarm. The weight of the float 6 is increased and adjusted through the test platform to improve the sensitivity of the float 6 during the sinking process. By increasing the magnetic force of the first magnetic block 7, the alarm sensing sensitivity between the first magnetic block 7 and the alarm sensing mechanism 5 is improved. By increasing the length of the support tube 4, the installation position of the alarm sensing mechanism 5 is raised, and the initial distance between the first magnetic block 7 and the alarm sensing mechanism 5 is shortened, which facilitates timely alarm of oil leakage, effectively saving gearbox lubricating oil and reducing losses. At the same time, when the float 6 sinks, the displacement sensor 2 senses the movement of the float 6, and the displacement sensor 2 issues an alarm through the alarm device 3, thereby improving the reliability of the device's oil leakage alarm.

[0030] Example 2

[0031] The alarm 3 and the support tube 4 are installed at the bottom of the housing 1, and the support tube 4 is connected to the top of the alarm 3; it also includes a displacement sensor 2, a float 6, a first magnetic block 7, a connecting seat 8, a test platform, a bottom plate 9, a cover 10, an observation window 11, two groups of bolts 12, a telescopic column 13, a second magnetic block 14, a tension spring 15, a connecting piece 16 and two groups of metal plates 17, the connecting seat 8 is electrically connected to the alarm 3, the alarm 3 and the displacement sensor 2 are electrically connected, and the connecting seat 8 is electrically connected to the external main control system, and the float 6 is electrically connected to the test platform. Mold opening processing, the first magnetic block 7 is installed at the bottom of the float 6 after the mold is opened, and the test platform is respectively adjusted for the weight of the float 6, the magnetic force of the first magnetic block 7 and the length of the support tube 4. The fixed end of the telescopic column 13 is installed on the upper part of the inner wall of the support tube 4, the second magnetic block 14 is installed on the movable end of the telescopic column 13, the tension spring 15 is fitted on the outer wall of the telescopic column 13, and one end of the tension spring 15 is connected to the inner wall of the support tube 4, and the other end of the tension spring 15 is connected to the outer wall of the second magnetic block 14, and the connecting piece 16 is installed on the outside of the second magnetic block 14 The first set of metal plates 17 is mounted on the end of the connecting piece 16, and the second set of metal plates 17 is mounted on the inner wall of the support tube 4. The two sets of metal plates 17 are mounted opposite to each other, and one set of metal plates 17 is electrically connected to the alarm 3. An oil inlet is provided at the lower rear end of the bottom plate 9, and the oil inlet is connected to the gear box through a pipeline. The displacement sensor 2 is mounted on the top of the inner wall of the bottom plate 9, and the alarm 3 is mounted on the bottom of the inner wall of the bottom plate 9. The cover 10 is mounted on the upper part of the bottom plate 9, and the float 6 is set up and down inside the bottom plate 9 and the cover 10. The observation window 11 is set on the cover 10 top, the cover body 10 and the base plate 9 are fixedly connected by two groups of bolts 12, and through holes are respectively provided on the displacement sensor 2 and the alarm 3, and the two groups of bolts 12 pass through the through holes of the displacement sensor 2 and the alarm 3 respectively. The mass of the float 6 is increased from the standard 2.018g to 2.058g, the magnetic force of the first magnetic block 7 is adjusted from the original 0.21MT to 0.25MT, the length of the support tube 4 is changed from the original 25mm to 75mm, and the installation position of the base plate 9 is consistent with the installation position of the crude oil level meter.

[0032] Example 3

[0033] The construction of the test platform includes the following steps:

[0034] Step 1: Processing and shaping: The float 6 is shaped according to the inner diameter of the bottom plate 9 and the cover 10. The weight of the float 6 after processing is 2.0g to 3.0g;

[0035] Step 2, build a test bench: install the first magnetic block 7 on the float 6, and place the float 6 with the first magnetic block 7 installed in a container filled with lubricating oil for a floating experiment. During the experiment, slowly drain or add the lubricating oil in the container, and observe the floating condition of the float 6. If it is found that the suspension sensitivity of the float 6 is poor, return the float 6 to step 1 for weight adjustment. After the suspension sensitivity of the float 6 meets the requirements, the float 6 is molded and processed.

[0036] Step 3: Assemble: Assemble the bottom plate 9, cover 10, float 6, first magnetic block 7 and other components to form the product;

[0037] Step 4: Build a test bench for the product: Install the product on the wind turbine gearbox to test the actual use effect;

[0038] Step 5, comparative test: Through research and analysis of the characteristics of crude oil level gauges and the deficiencies in actual applications, an oil level alarm signal experiment was conducted on the two oil level gauges. The oil was filled to the entire oil level gauge window and then slowly released. At this time, the oil level gauge alarm signal was measured and the alarm position of the float 6 was observed. The test data of this product was compared with the test results of the original product, and the product was optimized and adjusted. The adjustments included the length of the support tube 4, the height position of the alarm sensing mechanism 5, and the magnetic strength of the first magnetic block 7. This solved the problem of excessive oil leakage in the gearbox caused by the low alarm position and low sensitivity of the crude oil level gauge during field application.

[0039] Step 6: Product Forming: Test-install the two oil leakage control alarm devices, which are installed on two units respectively. The installation size and position are consistent with the crude oil level gauge, which is easy to install. The alarm logic is the same as the original alarm logic of the unit. The unit program does not need to be modified and is consistent with the design plan.

[0040] An oil level alarm signal test was conducted on two oil leakage control alarm devices. The oil was filled to the entire oil level gauge window and then slowly released. The oil level gauge alarm signal was measured to observe the floating depth alarm position. The oil level alarm scale was consistent with the designed scale and the design scale in the plan.

[0041] After 2 months of trial, there were no false alarms, no oil leakage, stable operation, and it can be used in batches.

[0042] like Figures 1 to 5As shown, the present invention is a control alarm device for reducing the leakage of lubricating oil in the gearbox of a wind turbine. When it is working, the lubricating oil in the gearbox enters the interior of the casing 1 through the pipeline. At this time, the liquid level height in the casing 1 is consistent with the lubricating oil level height in the gearbox, and the float 6 is suspended on the upper part of the lubricating oil liquid in the casing 1. At this time, the first magnetic block 7 is located above the alarm sensing mechanism 5. When the lubricating oil in the gearbox leaks outward, the liquid level height in the casing 1 is simultaneously reduced, and the float 6 sinks and drives the first magnetic block 7 to move downward. When the first magnetic block 7 moves downward to the side of the second magnetic block 14, a magnetic force is generated between the second magnetic block 14 and the first magnetic block 7. The second magnetic block 14 is affected by the magnetic force and moves and drives the connecting piece 16 and the left metal plate 17 to move. After the left metal plate 17 contacts the right metal plate 17, the power supply is connected, so that the alarm 3 is turned on to alarm. At the same time, when the float 6 sinks, the displacement sensor 2 senses the movement of the float 6, and the displacement sensor 2 alarms through the alarm 3.

[0043] The main functions achieved by the present invention are: by increasing and adjusting the weight of the float 6 through the test platform, the sensitivity of the float 6 during the sinking process is improved; by increasing the magnetic force of the first magnetic block 7, the alarm sensing sensitivity between the first magnetic block 7 and the alarm sensing mechanism 5 is improved; by increasing the length of the support tube 4, the installation position of the alarm sensing mechanism 5 is raised, and the initial distance between the first magnetic block 7 and the alarm sensing mechanism 5 is shortened, which is convenient for timely alarm of oil leakage, effectively saving the amount of gearbox lubricating oil and reducing losses. At the same time, when the float 6 sinks, the displacement sensor 2 senses the movement of the float 6, and the displacement sensor 2 alarms through the alarm 3, thereby improving the reliability of the device's oil penetration alarm.

[0044] The displacement sensor 2, alarm 3 and connecting seat 8 of the control alarm device for reducing lubricating oil leakage in the gearbox of a wind turbine generator system of the present invention are purchased on the market. Technicians in the industry only need to install and operate them according to the accompanying instruction manual without the need for creative work by technicians in this field.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine generator system, comprising a housing (1), an alarm (3) and a support pipe (4), wherein the alarm (3) is mounted on the inner bottom of the housing (1), the support pipe (4) is connected to the top of the alarm (3), and an oil inlet is provided at the lower rear end of the housing (1), and the oil inlet is connected to the gearbox through a pipeline; characterized in that: The apparatus further comprises a displacement sensor (2), an alarm sensing mechanism (5), a float (6), a first magnetic block (7), a connecting seat (8) and a test platform, wherein the displacement sensor (2) is mounted on the top of the housing (1), the alarm sensing mechanism (5) is mounted on the upper inner portion of the support tube (4), and the alarm sensing mechanism (5) is electrically connected to the alarm (3), the float (6) is arranged to slide up and down inside the housing (1), the connecting seat (8) is mounted on the bottom end of the housing (1), the connecting seat (8) is electrically connected to the alarm (3), the alarm (3) is electrically connected to the displacement sensor (2), and the connecting seat (8) is electrically connected to an external main control system, the float (6) is molded through the test platform, the first magnetic block (7) is mounted on the lower portion of the float (6) after the mold is opened, and the test platform performs experimental adjustments on the weight of the float (6), the magnetic force of the first magnetic block (7) and the length of the support tube (4); The alarm sensing mechanism (5) comprises a telescopic column (13), a second magnetic block (14), a tension spring (15), a connecting piece (16) and two groups of metal plates (17), wherein the fixed end of the telescopic column (13) is mounted on the upper portion of the inner wall of the support tube (4), the second magnetic block (14) is mounted on the movable end of the telescopic column (13), the tension spring (15) is fitted on the outer wall of the telescopic column (13), and one end of the tension spring (15) is connected to the inner wall of the support tube (4), and the other end of the tension spring (15) is connected to the outer wall of the second magnetic block (14), the connecting piece (16) is mounted on the outer wall of the second magnetic block (14), the first group of metal plates (17) is mounted on the end of the connecting piece (16), the second group of metal plates (17) is mounted on the inner wall of the support tube (4), the two groups of metal plates (17) are mounted opposite to each other, and one group of metal plates (17) is electrically connected to the alarm (3); The construction of the test platform includes the following steps: Step 1: Processing and shaping: The float (6) is shaped according to the inner diameter of the bottom plate (9) and the cover (10). The weight of the float (6) after processing is 2.0g to 3.0g; Step 2, building a test bench: installing the first magnetic block (7) on the float (6), placing the float (6) after the first magnetic block (7) is installed in a container filled with lubricating oil for a floating experiment, slowly draining or slowly adding lubricating oil in the container during the experiment, and observing the floating condition of the float (6) at the same time. If it is found that the suspension sensitivity of the float (6) is poor, the float (6) is returned to step 1 for weight adjustment until the suspension sensitivity of the float (6) meets the requirements, and then the float (6) is molded and processed; Step 3, assembly: assemble the bottom plate (9), the cover (10), the float (6) and the first magnetic block (7) to form a product; Step 4: Build a test bench for the product: Install the product on the wind turbine gearbox to test the actual use effect; Step 5, comparative test: by investigating and analyzing the characteristics of the crude oil level gauge and the problems existing in actual application, the oil level alarm signal experiment is carried out on the two oil level gauges. The oil is filled into the entire oil level gauge window, and then the oil is slowly released. At this time, the oil level gauge alarm signal is measured to observe the alarm position of the float (6). The test data of the product is analyzed with the test results of the original product, and the product is optimized and adjusted. The adjustment content includes the length of the support tube (4), the height position of the alarm sensing mechanism (5) and the magnetic strength structure of the first magnetic block (7). The problem of excessive oil leakage of the gear box caused by the low alarm position and low sensitivity of the crude oil level gauge during field application is solved; Step 6: Product forming.

2. A control and alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine as claimed in claim 1, characterized in that: The housing (1) comprises a base plate (9), a cover (10), an observation window (11) and two groups of bolts (12). An oil inlet is provided at the lower rear end of the base plate (9), and the oil inlet is connected to the gear box through a pipeline. The displacement sensor (2) is mounted on the top of the inner wall of the base plate (9), and the alarm (3) is mounted on the bottom of the inner wall of the base plate (9). The cover (10) is mounted on the upper part of the base plate (9). The float (6) slides up and down inside the base plate (9) and the cover (10). The observation window (11) is provided at the top of the cover (10). The cover (10) and the base plate (9) are fixedly connected by two groups of bolts (12). The displacement sensor (2) and the alarm (3) are respectively provided with through holes, and the two groups of bolts (12) pass through the through holes of the displacement sensor (2) and the alarm (3).

3. A control and alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine as claimed in claim 1, characterized in that: The mass of the float (6) is increased from the standard 2.018g to 2.058g.

4. A control and alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine as claimed in claim 1, characterized in that: The magnetic force of the first magnetic block (7) is adjusted from the original 0.21 MT to 0.25 MT.

5. The control and alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine as claimed in claim 1, characterized in that: The length of the support tube (4) is changed from the original 25 mm to 75 mm.

6. A control and alarm device for reducing lubricating oil leakage in a gearbox for a wind turbine as claimed in claim 2, characterized in that: The installation position of the base plate (9) is consistent with the installation position of the crude oil level meter.

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