Method and system for diagnosing wear degree of main gear of fan

Abstract

The invention discloses a fan main gear wear degree diagnosis method and system, and the method comprises the steps: carrying out the collection and normalization processing of a gear oil moisture value and a 40 DEG C kinematic viscosity data value, and obtaining a gear oil moisture normalization value and a 40 DEG C kinematic viscosity normalization value of the gear oil; acquiring and normalizing the acid value of the gear oil and the contents of iron, copper and phosphorus in the gear oil to obtain normalized values of the acid value, the content of the iron element, the content of the copper element and the content of the phosphorus element of the gear oil; performing weighted summation on the normalized values of the moisture of the gear oil, the kinematic viscosity of the gear oil at 40 DEG C, the acid value, the iron element content, the copper element content and the phosphorus element content to obtain a gear wear index; according to the gear wear index, judging whether the gear wear degree of the main gear box affects use and wear degree grades, and giving corresponding suggestions; the method has the advantages that the abrasion degree can be truly and reliably reflected, and stable and safe operation of the whole wind driven generator is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of operation and safety of wind turbine equipment in a wind farm, and in particular to a method and system for diagnosing the wear degree of a main gear of a wind turbine. Background Art

[0002] Wind power is a clean, environmentally friendly, and renewable energy source that has been widely used in many countries and regions. However, the wind power generation system is complex, involving multiple technical fields, and requires the cooperation of multiple teams to ensure the normal operation of the wind power generation system. With the rapid development of the wind power industry, wind power systems are widely distributed, resulting in the dispersion of wind power professional technicians. New technicians have no practical experience, insufficient ability to judge and handle wind power system anomalies, and reduced assurance of the safe operation of wind power systems.

[0003] The main shaft of a wind turbine (referred to as "wind turbine") is built into the gearbox and is driven by a two-pole planetary and one-stage parallel shaft mechanism. The wind turbine main gearbox usually refers to the planetary gearbox in the wind turbine. It is one of the key components in the wind turbine and is responsible for converting the low-speed rotation of the wind wheel into the high-speed rotation required by the generator, while increasing the torque. The weight of the gearbox accounts for about 1 / 2 of the nacelle. It is an important component of the doubly fed unit and also the most expensive component of the doubly fed unit. The stable operation of the gearbox can ensure the reliability of the wind turbine. Providing an efficient lubrication and cooling system for the gearbox is a prerequisite for ensuring its reliable operation.

[0004] The gearbox is one of the main components of a doubly-fed wind turbine. Its operating reliability directly determines the safety and stability of the unit, while the operating life of the gearbox depends on the lubrication and cooling system. A good lubrication and cooling system can not only effectively reduce the wear of the internal components of the gearbox and extend the life of the gears and bearings, but also absorb shock and vibration, reduce friction, and ensure the mechanical efficiency of the gearbox. Therefore, it is of great significance to strengthen the monitoring of the wear degree of the main gear and the diagnosis of abnormalities.

[0005] In order to ensure the safe operation of wind power generation systems, many research results have been published. For example, methods such as vibration analysis and temperature monitoring have been applied in the field of wind power generation system fault and abnormality diagnosis, and have achieved certain practical results; however, due to the high requirements for basic data, the above methods have a certain risk of misdiagnosis, so the application and development of the above methods in the field of wind power generation fault and abnormality diagnosis are subject to certain restrictions. Chinese Patent Publication No. CN110567712A discloses a method for evaluating the wear of a wind turbine gearbox and related equipment, which are used to accurately evaluate the degree of wear of a wind turbine gearbox and provide guarantee for the safe and reliable operation of a wind turbine. The method includes: obtaining a first power generation of a wind turbine in a first time period and a first increase in the iron element in the gear oil of the wind turbine; calculating a target increase based on the first power generation and the first increase in the iron element, the target increase is used to indicate the increase in the iron element in the effective time available to the wind turbine in the first time period; using the target increase to evaluate the degree of wear of the wind turbine gearbox. It correlates the iron element in the wind turbine gear oil with the wind turbine power generation to calculate the target increase and then evaluates the degree of wear of the wind turbine gearbox. The influencing factors considered are relatively simple and cannot fully and reliably reflect the degree of wear of the gearbox under operating conditions. Summary of the invention

[0006] The technical problem to be solved by the present invention is that the prior art method for diagnosing the degree of wear of the main gear of a wind turbine cannot fully and truly and reliably reflect the degree of wear of the gearbox under operating conditions, thereby failing to ensure the stable and safe operation of the entire wind turbine.

[0007] The present invention solves the above technical problems by the following technical means: A method for diagnosing the wear degree of a main gear of a fan comprises the following steps:

[0008] S1: collecting and normalizing the gear oil moisture value and 40°C kinematic viscosity data to obtain the gear oil moisture normalized value and the gear oil kinematic viscosity normalized value at 40°C;

[0009] S2: collecting and normalizing the gear oil acid value and the iron, copper and phosphorus content in the gear oil to obtain the normalized value of the gear oil acid value, the normalized value of the gear oil iron content, the normalized value of the gear oil copper content and the normalized value of the gear oil phosphorus content;

[0010] S3: performing weighted summation on the normalized value of gear oil moisture, the normalized value of gear oil kinematic viscosity at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to obtain the gear wear index;

[0011] S4: Determine whether the wear degree of the main gearbox gear affects the use and the wear degree level based on the gear wear index and give corresponding suggestions.

[0012] The present invention calculates the gear wear index by comprehensively considering factors such as the gear oil moisture value, 40°C kinematic viscosity data value, gear oil acid value, iron, copper, phosphorus content in the gear oil, etc., and judges whether the wear degree of the gears of the main gear box affects the use and the wear degree level according to the gear wear index, and gives corresponding suggestions. The present invention considers all factors comprehensively, can fully and truly and reliably reflect the wear degree of the gear box under the operating conditions, and gives an early warning of whether the main gear box is worn and the wear degree, thereby realizing the diagnosis of the early wear of the gears of the main gear box of the wind turbine in the wind farm, giving an early warning and suggesting measures to eliminate the fault, thereby improving the safety of the main transmission system of the wind turbine, and further ensuring the stable and safe operation of the entire wind turbine.

[0013] Furthermore, the S1 includes:

[0014] S11: Collecting gear oil moisture value;

[0015] S12: taking 0 mg / kg as the minimum value and 500 mg / kg as the maximum value, performing minimum-maximum normalization processing on the gear oil moisture value to obtain a normalized gear oil moisture value;

[0016] S13: Collect the kinematic viscosity value of the gear oil at 40°C;

[0017] S14: Taking the kinematic viscosity difference of 0% with the new oil as the minimum value and the kinematic viscosity difference of ±10% with the new oil as the maximum value, the kinematic viscosity value at 40°C is normalized to obtain the normalized kinematic viscosity value of the gear oil at 40°C.

[0018] Further, the S2 includes:

[0019] S21: Collect the current gear oil acid value;

[0020] S22: referencing the value of the new oil of the batch, setting the difference between the current gear oil acid value and the new oil acid value of 0% as the minimum value, and the difference between the current gear oil acid value and the new oil acid value of 50% as the maximum value, performing minimum-maximum normalization processing on the current gear oil acid value, and obtaining the normalized value of the gear oil acid value;

[0021] S23: Collecting the value of the iron content of the gear oil;

[0022] S24: performing minimum-maximum normalization processing on the iron content of the gear oil with 0 mg / kg as the minimum value and 70 mg / kg as the maximum value to obtain a normalized value of the iron content of the gear oil;

[0023] S25: Collect the copper content value of gear oil;

[0024] S26: Taking 0 mg / kg as the minimum value and 10 mg / kg as the maximum value, performing minimum-maximum normalization processing on the copper content to obtain a normalized value of the copper content of the gear oil;

[0025] S27: Collect and extract the phosphorus content of gear oil;

[0026] S28: Taking the difference between the phosphorus content of the gear oil and the phosphorus content of the new oil of the batch as 0% as the minimum value and the difference as ±15% as the maximum value, the phosphorus content of the gear oil is normalized to obtain the normalized value of the phosphorus content of the gear oil.

[0027] Further, the S3 includes:

[0028] S31: setting weights of the normalized value of gear oil moisture, the normalized value of gear oil kinematic viscosity at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to 0.1, 0.15, 0.25, 0.25, 0.1, and 0.15, respectively;

[0029] S32: The normalized main gear oil moisture content, kinematic viscosity at 40° C., acid value, iron content, copper content, and phosphorus content data are weighted and summed according to the weights set in S31 to obtain a gear wear index.

[0030] Further, the S4 includes:

[0031] S41: Determine whether the gear wear index GWI is greater than 0.7, if so, proceed to S42, otherwise it is determined that the main gear has no wear or has little wear, and no warning is issued;

[0032] S42: Determine whether the gear wear index GWI is greater than 0.9. If so, proceed to S43. Otherwise, it is determined that the main gear wear may affect the operation and is classified as secondary wear. A warning is issued to remind that the equipment needs to be inspected in the next three months.

[0033] S43: The gear wear index GWI is greater than 0.9, and it is determined that the main gear has first-level wear, and a serious warning is issued, reminding that an inspection is required within the next week.

[0034] The present invention also provides a diagnosis system for the wear degree of a main gear of a fan, comprising:

[0035] The first data processing module is used to collect and normalize the gear oil moisture value and 40°C kinematic viscosity data values ​​to obtain the gear oil moisture normalized value and the gear oil kinematic viscosity normalized value at 40°C;

[0036] The second data processing module is used to collect and normalize the gear oil acid value and the iron, copper and phosphorus content in the gear oil to obtain the normalized value of the gear oil acid value, the normalized value of the gear oil iron content, the normalized value of the gear oil copper content and the normalized value of the gear oil phosphorus content;

[0037] A wear index calculation module is used to perform weighted summation on the normalized value of gear oil moisture, the normalized value of kinematic viscosity of gear oil at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to obtain a gear wear index;

[0038] The wear assessment and recommendation module is used to determine whether the wear degree of the main gearbox gear affects the use and the wear degree level based on the gear wear index and give corresponding suggestions.

[0039] Furthermore, the first data processing module is also used for:

[0040] S11: Collecting gear oil moisture value;

[0041] S12: taking 0 mg / kg as the minimum value and 500 mg / kg as the maximum value, performing minimum-maximum normalization processing on the gear oil moisture value to obtain a normalized gear oil moisture value;

[0042] S13: Collect the kinematic viscosity value of the gear oil at 40°C;

[0043] S14: Taking the kinematic viscosity difference of 0% with the new oil as the minimum value and the kinematic viscosity difference of ±10% with the new oil as the maximum value, the kinematic viscosity value at 40°C is normalized to obtain the normalized kinematic viscosity value of the gear oil at 40°C.

[0044] Furthermore, the second data processing module is also used for:

[0045] S21: Collect the current gear oil acid value;

[0046] S22: referencing the value of the new oil of the batch, setting the difference between the current gear oil acid value and the new oil acid value of 0% as the minimum value, and the difference between the current gear oil acid value and the new oil acid value of 50% as the maximum value, performing minimum-maximum normalization processing on the current gear oil acid value, and obtaining the normalized value of the gear oil acid value;

[0047] S23: Collecting the value of the iron content of the gear oil;

[0048] S24: performing minimum-maximum normalization processing on the iron content of the gear oil with 0 mg / kg as the minimum value and 70 mg / kg as the maximum value to obtain a normalized value of the iron content of the gear oil;

[0049] S25: Collect the copper content value of gear oil;

[0050] S26: Taking 0 mg / kg as the minimum value and 10 mg / kg as the maximum value, performing minimum-maximum normalization processing on the copper content to obtain a normalized value of the copper content of the gear oil;

[0051] S27: Collect and extract the phosphorus content of gear oil;

[0052] S28: Taking the difference between the phosphorus content of the gear oil and the phosphorus content of the new oil of the batch as 0% as the minimum value and the difference as ±15% as the maximum value, the phosphorus content of the gear oil is normalized to obtain the normalized value of the phosphorus content of the gear oil.

[0053] Furthermore, the wear index calculation module is also used for:

[0054] S31: setting weights of the normalized value of gear oil moisture, the normalized value of gear oil kinematic viscosity at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to 0.1, 0.15, 0.25, 0.25, 0.1, and 0.15, respectively;

[0055] S32: The normalized main gear oil moisture content, kinematic viscosity at 40° C., acid value, iron content, copper content, and phosphorus content data are weighted and summed according to the weights set in S31 to obtain a gear wear index.

[0056] Furthermore, the wear assessment suggestion module is also used for:

[0057] S41: Determine whether the gear wear index GWI is greater than 0.7, if so, proceed to S42, otherwise it is determined that the main gear has no wear or has little wear, and no warning is issued;

[0058] S42: Determine whether the gear wear index GWI is greater than 0.9. If so, proceed to S43. Otherwise, it is determined that the main gear wear may affect the operation and is classified as secondary wear. A warning is issued to remind that the equipment needs to be inspected in the next three months.

[0059] S43: The gear wear index GWI is greater than 0.9, and it is determined that the main gear has first-level wear, and a serious warning is issued, reminding that an inspection is required within the next week.

[0060] The advantages of the present invention are as follows: the present invention comprehensively considers factors such as the gear oil moisture value, 40°C kinematic viscosity data value, gear oil acid value, iron, copper, phosphorus content in the gear oil and the like to calculate the gear wear index, and judges whether the wear degree of the main gear box gear affects the use and the wear degree grade according to the gear wear index, and gives corresponding suggestions, and considers comprehensive factors, and can completely and truly and reliably reflect the wear degree of the gear box under the operating conditions, and gives an early warning of whether the main gear box is worn and the wear degree, thereby realizing the diagnosis of the early wear of the gears of the main gear box of the wind turbine in the wind farm, giving an early warning and suggesting measures to eliminate the fault, thereby improving the safety of the main transmission system of the wind turbine, and further ensuring the stable and safe operation of the entire wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 This is a flow chart of a method for diagnosing the degree of wear of a main gear of a fan disclosed in Example 1 of the present invention;

[0062] Figure 2 This is a flow chart of S1 in a method for diagnosing the degree of wear of a main gear of a fan disclosed in Example 1 of the present invention;

[0063] Figure 3 This is a flow chart of S2 in a method for diagnosing the degree of wear of a main gear of a fan disclosed in Example 1 of the present invention.

[0064] Figure 4 This is a flow chart of S3 in a method for diagnosing the degree of wear of a main gear of a fan disclosed in Example 1 of the present invention.

[0065] Figure 5 This is a flow chart of S4 in a method for diagnosing the degree of wear of a main gear of a fan disclosed in Example 1 of the present invention. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] Example 1

[0068] like Figure 1 As shown, Embodiment 1 of the present invention provides a method for diagnosing the degree of wear of a main gear of a fan, comprising the following steps:

[0069] S1: Gear oil moisture value, 40℃ kinematic viscosity and other data collection, extraction and normalization processing, to obtain the gear oil moisture and kinematic viscosity for the moisture in the new oil and 40℃ kinematic viscosity normalized value, such as Figure 2 As shown, the specific process of S1 is:

[0070] S11: Collect and extract the moisture value of gear oil;

[0071] S12: Taking 0 mg / kg as the minimum value and 500 mg / kg as the maximum value, perform minimum-maximum normalization processing on the moisture value to obtain the gear oil moisture normalization value; the minimum-maximum normalization processing belongs to the prior art, and its calculation formula is x'=(x-min) / (max-min), x' is the normalized value, x is the original data, min is the minimum value, and max is the maximum value. The minimum-maximum normalization processing involved in the following places adopts the same calculation principle and will not be repeated.

[0072] S13: collecting and extracting the kinematic viscosity value of the gear oil at 40°C;

[0073] S14: The kinematic viscosity of the gear oil is normalized to the minimum value when the kinematic viscosity is 0% different from that of the new oil and the maximum value when the kinematic viscosity is ±10%.

[0074] S2: Data collection, extraction and normalization of gear oil acid value, iron, copper and phosphorus content, etc., to obtain the normalized values ​​of gear oil acid value iron, copper and phosphorus content, such as Figure 3 As shown, the specific process of S2 is:

[0075] S21: collecting and extracting the current gear oil acid value;

[0076] S22: referencing the value of the new oil of the batch, setting the difference of 0% from the acid value of the new oil as the minimum value and 50% as the maximum value, performing minimum-maximum normalization processing on the acid value to obtain the normalized value of the gear oil acid value;

[0077] S23: Collect and extract the value of iron content in gear oil;

[0078] S24: performing minimum-maximum normalization processing on the iron content of the gear oil by setting 0 mg / kg as the minimum value and 70 mg / kg as the maximum value to obtain a normalized value of the iron content of the gear oil;

[0079] S25: Collect and extract the copper content of gear oil;

[0080] S26: Let 0 mg / kg be the minimum value and 10 mg / kg be the maximum value, perform minimum-maximum normalization processing on the copper content, and obtain the normalized value of the copper content of the gear oil;

[0081] S27: Collect and extract the phosphorus content of gear oil;

[0082] S28: Let the difference of 0% with the phosphorus content of the new oil of the batch be the minimum value and ±15% be the maximum value, perform minimum-maximum normalization processing on the phosphorus content, and obtain the normalized value of the phosphorus content of the gear oil.

[0083] S3: Perform comprehensive data analysis on the collected data, and perform weighted summation on the normalized values ​​of the gear oil moisture, 40°C kinematic viscosity, acid value, iron, copper and phosphorus content, a total of 6 indicators, to obtain the gear wear index (GWI, Gear Wear Index), such as Figure 4 As shown, the specific process of S3 is:

[0084] S31: setting weight values ​​for the six indicators, which are: main gear oil moisture 0.1, kinematic viscosity at 40°C 0.15, acid value 0.25, iron content 0.25, copper content 0.1, phosphorus content 0.15, and the sum of the weight values ​​is 1;

[0085] S32: performing weighted summation on the normalized main gear oil moisture content, kinematic viscosity at 40° C., acid value, iron content, copper content, and phosphorus content data as described in S31 to obtain a gear wear index.

[0086] S4: Based on the gear wear evaluation index obtained in S3, determine whether the wear degree of the main gearbox gear affects the use, the wear degree level and give corresponding suggestions, such as Figure 5 As shown, the specific process of S4 is:

[0087] S41: judging that the gear wear index GWI>0.7, if the condition is met, proceed to S42, if not, judging that the main gear has no wear or has little wear, and no warning is issued;

[0088] S42: Determine that the gear wear index GWI>0.9. If the condition is met, proceed to S44. If not, it is determined that the main gear wear may affect the operation and is classified as secondary wear. A warning is issued to remind that the equipment needs to be inspected in the next three months.

[0089] S43: The gear wear index GWI is greater than 0.9, and it is determined that the main gear has first-level wear, and a serious warning is issued, reminding that an inspection is required within the next week.

[0090] S44: Analyze the causes of abnormal wear and give corresponding suggestions.

[0091] Table 1 Gear wear grade determination rules

[0092]

[0093] Through the above technical scheme, the diagnostic method provided by the present invention strengthens the operator's judgment on the fault, ensures the accurate positioning of the treatment measures for wear and tear that affects operation and departmental responsibilities, and warns of possible sudden failures caused by wear and tear, thereby reducing losses. This method can effectively improve the safety of the main transmission system of the wind turbine, thereby ensuring the stable and safe operation of the entire wind turbine.

[0094] Example 2

[0095] Based on Example 1, Example 2 of the present invention further provides a system for diagnosing the wear degree of a main gear of a fan, comprising:

[0096] The first data processing module is used to collect and normalize the gear oil moisture value and 40°C kinematic viscosity data values ​​to obtain the gear oil moisture normalized value and the gear oil kinematic viscosity normalized value at 40°C;

[0097] The second data processing module is used to collect and normalize the gear oil acid value and the iron, copper and phosphorus content in the gear oil to obtain the normalized value of the gear oil acid value, the normalized value of the gear oil iron content, the normalized value of the gear oil copper content and the normalized value of the gear oil phosphorus content;

[0098] A wear index calculation module is used to perform weighted summation on the normalized value of gear oil moisture, the normalized value of kinematic viscosity of gear oil at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to obtain a gear wear index;

[0099] The wear assessment and recommendation module is used to determine whether the wear degree of the main gearbox gear affects the use and the wear degree level based on the gear wear index and give corresponding suggestions.

[0100] Specifically, the first data processing module is further used for:

[0101] S11: Collecting gear oil moisture value;

[0102] S12: taking 0 mg / kg as the minimum value and 500 mg / kg as the maximum value, performing minimum-maximum normalization processing on the gear oil moisture value to obtain a normalized gear oil moisture value;

[0103] S13: Collect the kinematic viscosity value of the gear oil at 40°C;

[0104] S14: Taking the kinematic viscosity difference of 0% with the new oil as the minimum value and the kinematic viscosity difference of ±10% with the new oil as the maximum value, the kinematic viscosity value at 40°C is normalized to obtain the normalized kinematic viscosity value of the gear oil at 40°C.

[0105] Specifically, the second data processing module is further used for:

[0106] S21: Collect the current gear oil acid value;

[0107] S22: referencing the value of the new oil of the batch, setting the difference between the current gear oil acid value and the new oil acid value of 0% as the minimum value, and the difference between the current gear oil acid value and the new oil acid value of 50% as the maximum value, performing minimum-maximum normalization processing on the current gear oil acid value, and obtaining the normalized value of the gear oil acid value;

[0108] S23: Collecting the value of the iron content of the gear oil;

[0109] S24: performing minimum-maximum normalization processing on the iron content of the gear oil with 0 mg / kg as the minimum value and 70 mg / kg as the maximum value to obtain a normalized value of the iron content of the gear oil;

[0110] S25: Collect the copper content value of gear oil;

[0111] S26: Taking 0 mg / kg as the minimum value and 10 mg / kg as the maximum value, performing minimum-maximum normalization processing on the copper content to obtain a normalized value of the copper content of the gear oil;

[0112] S27: Collect and extract the phosphorus content of gear oil;

[0113] S28: Taking the difference between the phosphorus content of the gear oil and the phosphorus content of the new oil of the batch as 0% as the minimum value and the difference as ±15% as the maximum value, the phosphorus content of the gear oil is normalized to obtain the normalized value of the phosphorus content of the gear oil.

[0114] Specifically, the wear index calculation module is also used for:

[0115] S31: setting weights of the normalized value of gear oil moisture, the normalized value of gear oil kinematic viscosity at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to 0.1, 0.15, 0.25, 0.25, 0.1, and 0.15, respectively;

[0116] S32: The normalized main gear oil moisture content, kinematic viscosity at 40° C., acid value, iron content, copper content, and phosphorus content data are weighted and summed according to the weights set in S31 to obtain a gear wear index.

[0117] Specifically, the wear assessment suggestion module is also used for:

[0118] S41: Determine whether the gear wear index GWI is greater than 0.7, if so, proceed to S42, otherwise it is determined that the main gear has no wear or has little wear, and no warning is issued;

[0119] S42: Determine whether the gear wear index GWI is greater than 0.9. If so, proceed to S43. Otherwise, it is determined that the main gear wear may affect the operation and is classified as secondary wear. A warning is issued to remind that the equipment needs to be inspected in the next three months.

[0120] S43: The gear wear index GWI is greater than 0.9, and it is determined that the main gear has first-level wear, and a serious warning is issued, reminding that an inspection is required within the next week.

[0121] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for diagnosing the degree of wear of a main gear of a fan, characterized in that: The following steps are involved: S1: collecting and normalizing the gear oil moisture value and 40°C kinematic viscosity data to obtain the gear oil moisture normalized value and the gear oil kinematic viscosity normalized value at 40°C; S2: collecting and normalizing the gear oil acid value and the iron, copper and phosphorus content in the gear oil to obtain the normalized value of the gear oil acid value, the normalized value of the gear oil iron content, the normalized value of the gear oil copper content and the normalized value of the gear oil phosphorus content; S3: performing weighted summation on the normalized value of gear oil moisture, the normalized value of gear oil kinematic viscosity at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to obtain the gear wear index; S4: Determine whether the wear degree of the main gearbox gear affects the use and the wear degree level based on the gear wear index and give corresponding suggestions.

2. A method for diagnosing the degree of wear of a main gear of a fan according to claim 1, characterized in that: The S1 includes: S11: Collecting gear oil moisture value; S12: taking 0 mg / kg as the minimum value and 500 mg / kg as the maximum value, performing minimum-maximum normalization processing on the gear oil moisture value to obtain a normalized gear oil moisture value; S13: Collect the kinematic viscosity value of the gear oil at 40°C; S14: Taking the kinematic viscosity difference of 0% with the new oil as the minimum value and the kinematic viscosity difference of ±10% with the new oil as the maximum value, the kinematic viscosity value at 40°C is normalized to obtain the normalized kinematic viscosity value of the gear oil at 40°C.

3. A method for diagnosing the degree of wear of a main gear of a fan according to claim 1, characterized in that: The S2 includes: S21: Collect the current gear oil acid value; S22: referencing the value of the new oil of the batch, setting the difference between the current gear oil acid value and the new oil acid value of 0% as the minimum value, and the difference between the current gear oil acid value and the new oil acid value of 50% as the maximum value, performing minimum-maximum normalization processing on the current gear oil acid value, and obtaining the normalized value of the gear oil acid value; S23: Collecting the value of the iron content of the gear oil; S24: performing minimum-maximum normalization processing on the iron content of the gear oil with 0 mg / kg as the minimum value and 70 mg / kg as the maximum value to obtain a normalized value of the iron content of the gear oil; S25: Collect the copper content value of gear oil; S26: Taking 0 mg / kg as the minimum value and 10 mg / kg as the maximum value, performing minimum-maximum normalization processing on the copper content to obtain a normalized value of the copper content of the gear oil; S27: Collect and extract the phosphorus content of gear oil; S28: Taking the difference between the phosphorus content of the gear oil and the phosphorus content of the new oil of the batch as 0% as the minimum value and the difference as ±15% as the maximum value, the phosphorus content of the gear oil is normalized to obtain the normalized value of the phosphorus content of the gear oil.

4. A method for diagnosing the degree of wear of a main gear of a fan according to claim 1, characterized in that: The S3 includes: S31: setting weights of the normalized value of gear oil moisture, the normalized value of gear oil kinematic viscosity at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to 0.1, 0.15, 0.25, 0.25, 0.1, and 0.15, respectively; S32: The normalized main gear oil moisture content, kinematic viscosity at 40° C., acid value, iron content, copper content, and phosphorus content data are weighted and summed according to the weights set in S31 to obtain a gear wear index.

5. A method for diagnosing the degree of wear of a main gear of a fan according to claim 1, characterized in that: The S4 includes: S41: Determine whether the gear wear index GWI is greater than 0.7, if so, proceed to S42, otherwise it is determined that the main gear has no wear or has little wear, and no warning is issued; S42: Determine whether the gear wear index GWI is greater than 0.

9. If so, proceed to S43. Otherwise, it is determined that the main gear wear may affect the operation and is classified as secondary wear. A warning is issued to remind that the equipment needs to be inspected in the next three months. S43: The gear wear index GWI is greater than 0.9, and it is determined that the main gear has first-level wear, and a serious warning is issued, reminding that an inspection is required within the next week.

6. A diagnosis system for the wear degree of the main gear of a fan, characterized in that: include: The first data processing module is used to collect and normalize the gear oil moisture value and 40°C kinematic viscosity data values ​​to obtain the gear oil moisture normalized value and the gear oil kinematic viscosity normalized value at 40°C; The second data processing module is used to collect and normalize the gear oil acid value and the iron, copper and phosphorus content in the gear oil to obtain the normalized value of the gear oil acid value, the normalized value of the gear oil iron content, the normalized value of the gear oil copper content and the normalized value of the gear oil phosphorus content; A wear index calculation module is used to perform weighted summation on the normalized value of gear oil moisture, the normalized value of kinematic viscosity of gear oil at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to obtain a gear wear index; The wear assessment and recommendation module is used to determine whether the wear degree of the main gearbox gear affects the use and the wear degree level based on the gear wear index and give corresponding suggestions.

7. A diagnosis system for the wear degree of a main gear of a fan according to claim 6, characterized in that: The first data processing module is also used for: S11: Collecting gear oil moisture value; S12: taking 0 mg / kg as the minimum value and 500 mg / kg as the maximum value, performing minimum-maximum normalization processing on the gear oil moisture value to obtain a normalized gear oil moisture value; S13: Collect the kinematic viscosity value of the gear oil at 40°C; S14: Taking the kinematic viscosity difference of 0% with the new oil as the minimum value and the kinematic viscosity difference of ±10% with the new oil as the maximum value, the kinematic viscosity value at 40°C is normalized to obtain the normalized kinematic viscosity value of the gear oil at 40°C.

8. A diagnosis system for the wear degree of a main gear of a fan according to claim 6, characterized in that: The second data processing module is also used for: S21: Collect the current gear oil acid value; S22: referencing the value of the new oil of the batch, setting the difference between the current gear oil acid value and the new oil acid value of 0% as the minimum value, and the difference between the current gear oil acid value and the new oil acid value of 50% as the maximum value, performing minimum-maximum normalization processing on the current gear oil acid value, and obtaining the normalized value of the gear oil acid value; S23: Collecting the value of the iron content of the gear oil; S24: performing minimum-maximum normalization processing on the iron content of the gear oil with 0 mg / kg as the minimum value and 70 mg / kg as the maximum value to obtain a normalized value of the iron content of the gear oil; S25: Collect the copper content value of gear oil; S26: Taking 0 mg / kg as the minimum value and 10 mg / kg as the maximum value, performing minimum-maximum normalization processing on the copper content to obtain a normalized value of the copper content of the gear oil; S27: Collect and extract the phosphorus content of gear oil; S28: Taking the difference between the phosphorus content of the gear oil and the phosphorus content of the new oil of the batch as 0% as the minimum value and the difference as ±15% as the maximum value, the phosphorus content of the gear oil is normalized to obtain the normalized value of the phosphorus content of the gear oil.

9. A diagnosis system for the wear degree of a main gear of a fan according to claim 6, characterized in that: The wear index calculation module is also used for: S31: setting weights of the normalized value of gear oil moisture, the normalized value of gear oil kinematic viscosity at 40°C, the normalized value of gear oil acid value, the normalized value of gear oil iron content, the normalized value of gear oil copper content, and the normalized value of gear oil phosphorus content to 0.1, 0.15, 0.25, 0.25, 0.1, and 0.15, respectively; S32: The normalized main gear oil moisture content, kinematic viscosity at 40° C., acid value, iron content, copper content, and phosphorus content data are weighted and summed according to the weights set in S31 to obtain a gear wear index.

10. A diagnosis system for the wear degree of a main gear of a fan according to claim 6, characterized in that: The wear assessment suggestion module is also used to: S41: Determine whether the gear wear index GWI is greater than 0.7, if so, proceed to S42, otherwise it is determined that the main gear has no wear or has little wear, and no warning is issued; S42: Determine whether the gear wear index GWI is greater than 0.

9. If so, proceed to S43. Otherwise, it is determined that the main gear wear may affect the operation and is classified as secondary wear. A warning is issued to remind that the equipment needs to be inspected in the next three months. S43: The gear wear index GWI is greater than 0.9, and it is determined that the main gear has first-level wear, and a serious warning is issued, reminding that an inspection is required within the next week.

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