Variable-pitch bearing lubricating system

Abstract

The invention provides a variable pitch bearing lubricating system, which relates to the technical field of wind turbine generator lubricating, and comprises a storage box, a conveying pipeline, a lubricating pump, a distributor, an injection pipe, a recovery pipe, a recovery box and a control module, the lubricating pump is mounted on the conveying pipeline, and the conveying pipeline is used for communicating the storage box with the distributor; a plurality of lubricating connectors and recycling connectors are arranged on the variable pitch bearing, one end of each injection pipe is fixedly connected to a liquid outlet of the distributor, the other end of each injection pipe is fixedly connected to the corresponding lubricating connector, one end of each recycling pipe is fixedly connected to the corresponding recycling connector, and the other end of each recycling pipe is communicated with the recycling box. The control module is in communication connection with the lubricating pump, the distributor and the monitoring module, and flow sensors are arranged on the injection pipe and the recovery pipe. The technical problems that in the prior art, a mechanism for adjusting the adding condition of lubricating grease according to the working condition of the variable pitch bearing lacks, the lubricating effect is poor, or the lubricating grease overflows to cause device faults are solved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine lubrication, and in particular to a variable pitch bearing lubrication system. Background Art

[0002] With the development of bearing technology, the grease lubrication technology of wind turbine pitch bearings has been rapidly improved. New wind turbine pitch bearings are equipped with automatic lubrication systems or semi-automatic lubrication systems for re-lubrication. The automatic lubrication systems of wind turbines are all timed, fixed-point, and quantitative lubrication mechanisms. There is no mechanism to adjust the addition of grease according to the working conditions of the pitch bearings, resulting in poor lubrication effects or grease overflow, causing technical problems such as device failure. Summary of the invention

[0003] The present invention provides a variable pitch bearing lubrication system to solve the technical problem that the prior art lacks a mechanism for adjusting the addition of grease according to the working condition of the variable pitch bearing, resulting in poor lubrication effect or grease overflow causing device failure.

[0004] On the one hand, the present invention provides a variable pitch bearing lubrication system, including a storage box, a delivery pipeline, a lubrication pump, a distributor, a plurality of injection pipes, a plurality of recovery pipes, a recovery box and a control module, the lubrication pump is installed on the delivery pipeline, the delivery pipeline is used to connect the storage box and the distributor, a plurality of lubrication interfaces and recovery interfaces are provided on the variable pitch bearing, one end of the injection pipe is respectively fixedly connected to different liquid outlets of the distributor, the other end of the injection pipe is fixedly connected to the corresponding lubrication interface, one end of the recovery pipe is respectively fixedly connected to different recovery interfaces, the other end of the recovery pipe is connected to the recovery box, a monitoring module is provided in the storage box, the monitoring module is used to monitor the state of the grease in the storage box, the control module is communicatively connected to the lubrication pump, the distributor and the monitoring module, and flow sensors are provided on the injection pipe and the recovery pipe.

[0005] Preferably, the control module includes:

[0006] A grease dispensing unit for determining the amount of grease to be dispensed to each injection pipe;

[0007] A flow monitoring unit is used to monitor the grease flow of each injection pipe and recovery pipe, and to give an alarm when the grease flow of the injection pipe during the injection period or the grease flow of the recovery pipe during the recovery period is lower than a preset threshold;

[0008] Data verification unit for evaluating the working condition of the lubrication system based on the grease distribution amount and the grease flow in the injection pipe and the recovery pipe.

[0009] Preferably, the grease dispensing unit comprises:

[0010] Operation monitoring subunit, used to obtain the working condition of the pitch bearing;

[0011] A distribution amount calculation subunit is used to calculate the grease distribution amount required to be distributed to each injection pipe;

[0012]

[0013] Among them, ω z is the amount of grease required to be distributed to the zth injection pipe; ln is the logarithmic function with e as the base; e is the natural base; T z is the actual operating temperature of the variable pitch bearing at the lubrication interface corresponding to the zth injection pipe; T0 is the calculation reference value of the variable pitch bearing operating temperature; D z is the filling cycle of the zth injection pipe; D0 is the calculation reference value of the filling cycle; σ1 and σ2 are the weighted coefficients of the influence of the load condition and the working speed of the variable pitch bearing respectively; τ is the actual working load of the variable pitch bearing; is the actual working speed of the variable pitch bearing; τ0 is the calculation reference value of the working load of the variable pitch bearing; is the calculation reference value of the working speed of the pitch bearing; μ z This is the reference value for the grease dispensing amount for the zth injection pipe.

[0014] Preferably, the data verification unit includes:

[0015] A metering subunit, used to obtain the total amount of grease passing through the injection pipe during the filling period and the amount of grease passing through the recovery pipe during the recovery period;

[0016] The standard acquisition subunit is used to obtain the grease distribution amount of each injection pipe in the current filling period as the injection standard value of the corresponding injection pipe, and obtain the total grease flow rate of all injection pipes in the previous filling period as the total recovery standard value of all recovery pipes;

[0017] The alarm subunit generates an alarm when the deviation between the total grease flow rate of each injection pipe and the corresponding injection standard value exceeds a preset second threshold value or the deviation between the total grease flow rate of all recovery pipes and the total recovery standard value exceeds a preset third threshold value.

[0018] Preferably, the monitoring module includes:

[0019] A camera, disposed on the inner top surface of the storage box, for capturing a real-time image of the grease in the storage box;

[0020] A quality assessment unit, used for periodically assessing the state of the grease in the storage box based on a real-time image of the grease, and obtaining a state assessment result of the grease;

[0021] The first alarm unit is used to sound an alarm when the status assessment result of the grease does not meet the use requirements, so as to remind the staff to replace the grease.

[0022] Preferably, the quality assessment unit comprises:

[0023] An image acquisition subunit is used to take a real-time image of the grease at a plurality of time points within a specified time range as an evaluation image;

[0024] An evaluation parameter calculation subunit, used for calculating a state evaluation parameter of the grease based on the evaluation image;

[0025] The result output subunit is used to output the state evaluation result of the grease based on the state evaluation parameter of the grease. When the state evaluation parameter of the grease is greater than or equal to a preset first threshold, the state evaluation result of the grease does not meet the use requirements. When the state evaluation parameter of the grease is less than the preset first threshold, the evaluation result meets the use requirements.

[0026] Preferably, the evaluation parameter calculation subunit includes:

[0027] The region extraction block is used to randomly select several evaluation regions in each evaluation image;

[0028] A pixel selection block is used to randomly select a number of evaluation pixels in each evaluation area;

[0029] A pixel sorting block divides the evaluation pixels into color pixels and impurity pixels according to the pixel evaluation parameters;

[0030] Condition evaluation block for calculating condition evaluation parameters of lubricating grease.

[0031] Preferably, the pixel sorting block divides the color pixels and the impurity pixels based on the pixel evaluation parameter;

[0032] S=|G s -G0|-G x ;

[0033] Among them, S is the pixel evaluation parameter; G s is the gray value of the evaluation pixel; G0 is the gray reference value of the evaluation pixel; G x is the grayscale deviation judgment value of the evaluated pixel; | | is the absolute value symbol;

[0034] When the pixel evaluation parameter of the evaluation pixel is greater than or equal to 0, the evaluation pixel is a foreign pixel; when the pixel evaluation parameter of the evaluation pixel is less than 0, the evaluation pixel is a color pixel.

[0035] Preferably, the condition assessment block calculates the condition assessment parameter of the grease based on the following formula;

[0036]

[0037]

[0038] Where P is the grease condition evaluation parameter; H is the total number of evaluation images; L k is the evaluation parameter of the kth evaluation image; F is the discriminant value of the evaluation parameter of the evaluation image; M k is the total number of evaluation regions in the kth evaluation image; is the rounding symbol; | | is the absolute value symbol; N ik A is the total number of evaluation pixels in the i-th evaluation area of ​​the k-th evaluation image; ik is the total number of impurity pixels in the i-th evaluation area of ​​the k-th evaluation image; α1 and α2 are the calculation coefficients of the influence of grease color and the number of impurity pixels, respectively; G ijk is the gray value of the jth color pixel in the ith evaluation area of ​​the kth evaluation image; G0 is the reference value of the gray value of the evaluation pixel; G V is the discriminant value for evaluating the gray value deviation of the pixel; ln is the logarithmic function with e as the base; e is the natural base; Q k is the shooting time point corresponding to the kth evaluation image; Q1 is the shooting time point corresponding to the earliest evaluation image; L H is the evaluation parameter of the latest evaluation image; L1 is the evaluation parameter of the earliest evaluation image; Q H is the shooting time point of the latest evaluation image; B is the allowable deviation value of the evaluation parameter of the evaluation image; W is the grading basis of the deviation of the evaluation parameter.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The actual required grease distribution amount of each lubrication interface is determined based on the operating temperature, filling cycle, load conditions and operating speed of the pitch bearing, so that the grease addition amount of each lubrication interface is more suitable for the actual working condition of the pitch bearing, ensuring the lubrication effect of the pitch bearing. The appropriate grease addition amount can effectively reduce the grease loss, improve the utilization rate of the grease, and help reduce the chance of grease leakage, thereby avoiding equipment failure caused by grease leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a structural schematic diagram of the present invention.

[0043] Reference numerals:

[0044] 1. Storage box; 2. Delivery pipeline; 3. Lubrication pump; 4. Distributor; 5. Injection pipe; 6. Recovery pipe; 7. Recovery box; 8. Lubrication interface; 9. Recovery interface. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0046] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] Example 1

[0048] An embodiment of the present invention provides a variable pitch bearing lubrication system, including a storage box 1, a delivery pipeline 2, a lubrication pump 3, a distributor 4, a plurality of injection pipes 5, a plurality of recovery pipes 6, a recovery box 7 and a control module, wherein the lubrication pump 3 is installed on the delivery pipeline 2, and the delivery pipeline 2 is used to connect the storage box 1 and the distributor 4, and the variable pitch bearing is provided with a plurality of lubrication interfaces 8 and a recovery interface 9, one end of the injection pipe 5 is respectively fixedly connected to different liquid outlets of the distributor 4, and the other end of the injection pipe 5 is fixedly connected to the corresponding lubrication interface 8, one end of the recovery pipe 6 is respectively fixedly connected to different recovery interfaces 9, and the other end of the recovery pipe 6 is connected to the recovery box 7, and a monitoring module is provided in the storage box 1, and the monitoring module is used to monitor the state of the grease in the storage box 1, and the control module is communicatively connected with the lubrication pump 3, the distributor 4 and the monitoring module, and flow sensors are provided on the injection pipe 5 and the recovery pipe 6.

[0049] Preferably, the control module includes:

[0050] A grease distribution unit, used to determine the amount of grease to be distributed to each injection pipe 5;

[0051] A flow monitoring unit is used to monitor the grease flow of each injection pipe 5 and recovery pipe 6, and to give an alarm when the grease flow of the injection pipe 5 during the injection time period or the grease flow of the recovery pipe 6 during the recovery time period is lower than a preset threshold;

[0052] The data verification unit is used to evaluate the working condition of the lubrication system based on the grease distribution amount and the grease flow rate of the injection pipe 5 and the recovery pipe 6.

[0053] Preferably, the grease dispensing unit comprises:

[0054] Operation monitoring subunit, used to obtain the working condition of the pitch bearing;

[0055] A distribution amount calculation subunit, used to calculate the distribution amount of grease required to be distributed to each injection pipe 5;

[0056]

[0057] Among them, ω z is the amount of grease required to be distributed to the zth injection pipe 5; ln is a logarithmic function with e as the base; e is a natural base; T z is the actual operating temperature of the variable pitch bearing at the position of the lubrication interface 8 corresponding to the zth injection pipe 5; T0 is the calculation reference value of the variable pitch bearing operating temperature; D z is the filling cycle of the z-th injection pipe 5; D0 is the calculation reference value of the filling cycle; σ1 and σ2 are the weighted coefficients of the influence of the load condition and the working speed of the variable pitch bearing respectively; τ is the actual working load of the variable pitch bearing; is the actual working speed of the variable pitch bearing; τ0 is the calculation reference value of the working load of the variable pitch bearing; is the calculation reference value of the working speed of the pitch bearing; μ z It is the reference value of the grease distribution amount of the z-th injection pipe 5.

[0058] Preferably, the data verification unit includes:

[0059] A metering subunit, used to obtain the total amount of grease flowing through the injection pipe 5 during the filling period and the amount of grease flowing through the recovery pipe 6 during the recovery period;

[0060] The standard acquisition subunit is used to obtain the grease distribution amount of each injection pipe 5 in the current filling period as the injection standard value of the corresponding injection pipe 5, and obtain the total grease flow rate of all injection pipes 5 in the previous filling period as the total recovery standard value of all recovery pipes 6;

[0061] The alarm subunit sounds an alarm when the deviation between the total grease flow rate of each injection pipe 5 and the corresponding injection standard value exceeds a preset second threshold value or the deviation between the total grease flow rate of all recovery pipes 6 and the total recovery standard value exceeds a preset third threshold value.

[0062] In this embodiment, the working conditions of the pitch bearing include working temperature, load condition, and working speed.

[0063] The beneficial effects of the above technical solution are:

[0064] When adding grease, the grease in the variable pitch bearing is first recovered through the recovery pipe 6, and then a certain amount of grease is extracted from the storage box 1 by the lubrication pump 3 and transported to the distributor 4. The grease is distributed according to the calculated grease distribution amount required by each injection pipe 5, so that the grease is input to the corresponding lubrication point to ensure the lubrication effect of the variable pitch bearing, avoiding poor lubrication effect or excessive grease addition from overflowing from the variable pitch bearing, causing device failure.

[0065] By monitoring the grease flow rate of each injection pipe 5 and recovery pipe 6, it is possible to promptly determine whether the injection pipe 5 and the recovery pipe 6 are unobstructed, thereby avoiding blockage of the injection pipe 5 or the recovery pipe 6 and causing leakage of grease, which may cause device failure. Monitoring the actual flow rate of the injection pipe 5 and the recovery pipe 6 can also determine the actual injection amount and actual recovery amount of grease based on the flow information, thereby ensuring sufficient injection of grease and ensuring the lubrication effect. Firstly, it avoids blockage caused by residual grease in the injection pipe 5 and the recovery pipe 6, and secondly, it avoids incomplete grease recovery, and the failed grease remains inside the variable pitch bearing and dries up, resulting in a decrease in the lubrication effect.

[0066] The actual required grease distribution amount of each lubrication interface 8 is determined based on the operating temperature, filling cycle, load conditions and operating speed of the variable pitch bearing, so that the grease addition amount of each lubrication interface 8 is more suitable for the actual working condition of the variable pitch bearing, ensuring the lubrication effect of the variable pitch bearing. The appropriate grease addition amount can effectively reduce the grease loss, improve the utilization rate of the grease, and help reduce the chance of grease leakage, thereby avoiding equipment failure caused by grease leakage.

[0067] Example 2

[0068] Based on Example 1, the monitoring module includes:

[0069] A camera, disposed on the inner top surface of the storage box 1, for capturing a real-time image of the grease in the storage box 1;

[0070] A quality assessment unit, used to periodically assess the state of the grease in the storage box 1 based on a real-time image of the grease, and obtain a state assessment result of the grease;

[0071] The first alarm unit is used to sound an alarm when the status assessment result of the grease does not meet the use requirements, so as to remind the staff to replace the grease.

[0072] Preferably, the quality assessment unit comprises:

[0073] An image acquisition subunit is used to take a real-time image of the grease at a plurality of time points within a specified time range as an evaluation image;

[0074] An evaluation parameter calculation subunit, used for calculating a state evaluation parameter of the grease based on the evaluation image;

[0075] The result output subunit is used to output the state evaluation result of the grease based on the state evaluation parameter of the grease. When the state evaluation parameter of the grease is greater than or equal to a preset first threshold, the state evaluation result of the grease does not meet the use requirements. When the state evaluation parameter of the grease is less than the preset first threshold, the evaluation result meets the use requirements.

[0076] Preferably, the evaluation parameter calculation subunit includes:

[0077] The region extraction block is used to randomly select several evaluation regions in each evaluation image;

[0078] A pixel selection block is used to randomly select a number of evaluation pixels in each evaluation area;

[0079] A pixel sorting block divides the evaluation pixels into color pixels and impurity pixels according to the pixel evaluation parameters;

[0080] Condition evaluation block for calculating condition evaluation parameters of lubricating grease.

[0081] Preferably, the pixel sorting block divides the color pixels and the impurity pixels based on the pixel evaluation parameter;

[0082] S=|G s -G0|-G x ;

[0083] Among them, S is the pixel evaluation parameter; G s is the gray value of the evaluation pixel; G0 is the gray reference value of the evaluation pixel; G x is the grayscale deviation judgment value of the evaluated pixel; | | is the absolute value symbol;

[0084] When the pixel evaluation parameter of the evaluation pixel is greater than or equal to 0, the evaluation pixel is a foreign pixel; when the pixel evaluation parameter of the evaluation pixel is less than 0, the evaluation pixel is a color pixel.

[0085] Preferably, the condition assessment block calculates the condition assessment parameter of the grease based on the following formula;

[0086]

[0087]

[0088] Where P is the grease condition evaluation parameter; H is the total number of evaluation images; L k is the evaluation parameter of the kth evaluation image; F is the discriminant value of the evaluation parameter of the evaluation image; M k is the total number of evaluation regions in the kth evaluation image; is the rounding symbol; | | is the absolute value symbol; N ik A is the total number of evaluation pixels in the i-th evaluation area of ​​the k-th evaluation image; ik is the total number of impurity pixels in the i-th evaluation area of ​​the k-th evaluation image; α1 and α2 are the calculation coefficients of the influence of grease color and the number of impurity pixels, respectively; G ijk is the gray value of the jth color pixel in the ith evaluation area of ​​the kth evaluation image; G0 is the reference value of the gray value of the evaluation pixel; G V is the discriminant value for evaluating the gray value deviation of the pixel; ln is the logarithmic function with e as the base; e is the natural base; Q k is the shooting time point corresponding to the kth evaluation image; Q1 is the shooting time point corresponding to the earliest evaluation image; L H is the evaluation parameter of the latest evaluation image; L1 is the evaluation parameter of the earliest evaluation image; Q His the shooting time point of the latest evaluation image; B is the allowable deviation value of the evaluation parameter of the evaluation image; W is the grading basis of the deviation of the evaluation parameter.

[0089] In this embodiment, the evaluation parameter of the evaluation image is a parameter reflecting the state of the grease in one evaluation image.

[0090] The beneficial effects of the above technical solution are:

[0091] By regularly evaluating the state of the grease in the storage box 1, it is ensured that the quality of the grease in the storage box 1 is in good condition, thereby ensuring the lubrication effect on the variable pitch bearing. By arranging a camera in the storage box 1, the actual image of the grease in the storage box 1 can be automatically obtained, thereby realizing the automation of grease quality detection. There is no need for manual detection, which reduces the workload of the staff. When the quality of the grease cannot meet the use requirements, an alarm is used to remind the staff to replace the grease in time, thereby ensuring the excellent lubrication effect on the variable pitch bearing.

[0092] By acquiring evaluation images at different time points, the deviation of the evaluation results caused by accidental events is avoided and the accuracy of the evaluation results is ensured. By dividing the evaluation pixels into color pixels and impurity pixels, which are used to evaluate the color of the grease and the impurity situation of the grease respectively, the accuracy of the evaluation results is improved and the deviation of color evaluation caused by the presence of impurity pigments is avoided.

[0093] When calculating the grease condition evaluation parameters, the color of the grease and the impurity content of the grease in the evaluation image are first considered to obtain the evaluation parameters of each evaluation image. The proportion of evaluation images that judge that the grease does not meet the use requirements is The theoretical evaluation parameter reference value at the time of shooting the kth evaluation image is calculated, and then The average deviation between the actual evaluation parameters of all evaluation images and the theoretical evaluation parameter reference values ​​is obtained (the larger the average deviation, the more it means that the actual evaluation parameters of the evaluation images have mutated and have not approached the theoretical evaluation parameter reference values ​​through reverse mutation, which means that the grease has been suddenly contaminated during storage, causing the evaluation parameters to mutate). By comprehensively considering the average deviation between the actual evaluation parameters of the evaluation images and the theoretical evaluation parameter reference values, the final grease state evaluation parameters are obtained, which not only avoids the impact of the shooting quality problem on the test results during the detection process, but also takes into account the difference between the normal change of the lubricant quality and the actual change, thereby improving the accuracy of the grease state evaluation parameters and ensuring that the grease state evaluation parameters can more accurately reflect the quality of the grease.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 variable pitch bearing lubrication system, characterized in that: The invention comprises a storage box (1), a delivery pipeline (2), a lubrication pump (3), a distributor (4), a plurality of injection pipes (5), a plurality of recovery pipes (6), a recovery box (7) and a control module. The lubrication pump (3) is installed on the delivery pipeline (2). The delivery pipeline (2) is used to connect the storage box (1) and the distributor (4). The variable pitch bearing is provided with a plurality of lubrication interfaces (8) and a recovery interface (9). One end of the injection pipe (5) is respectively fixedly connected to different liquid outlets of the distributor (4). The other end of the injection pipe (5) is fixedly connected to the corresponding lubrication interface (8). One end of the recovery pipe (6) is respectively fixedly connected to different recovery interfaces (9). The other end of the recovery pipe (6) is connected to the recovery box (7). A monitoring module is provided in the storage box (1). The monitoring module is used to monitor the state of the lubricating grease in the storage box (1). The control module is communicatively connected with the lubrication pump (3), the distributor (4) and the monitoring module. Flow sensors are provided on the injection pipe (5) and the recovery pipe (6).

2. A pitch bearing lubrication system according to claim 1, characterized in that: The control module includes: A grease distribution unit, used to determine the amount of grease to be distributed to each injection pipe (5); A flow monitoring unit, used to monitor the grease flow of each injection pipe (5) and recovery pipe (6), and to generate an alarm when the grease flow of the injection pipe (5) during the injection time period or the grease flow of the recovery pipe (6) during the recovery time period is lower than a preset threshold; The data verification unit is used to evaluate the working condition of the lubrication system based on the grease distribution amount and the grease flow rate of the injection pipe (5) and the recovery pipe (6).

3. A pitch bearing lubrication system according to claim 2, characterized in that: The grease dispensing unit consists of: Operation monitoring subunit, used to obtain the working condition of the pitch bearing; A distribution amount calculation subunit, used for calculating the distribution amount of grease required to be distributed to each injection pipe (5); Among them, ω z is the amount of grease required to be distributed to the zth injection pipe (5); ln is a logarithmic function with e as the base; e is a natural base; T z is the actual operating temperature of the variable pitch bearing at the position of the lubrication interface (8) corresponding to the zth injection pipe (5); T0 is the calculation reference value of the operating temperature of the variable pitch bearing; D z is the filling cycle of the zth injection pipe (5); D0 is the calculation reference value of the filling cycle; σ1 and σ2 are weighted coefficients of the influence of the load condition and the working speed of the variable pitch bearing respectively; τ is the actual working load of the variable pitch bearing; is the actual working speed of the variable pitch bearing; τ0 is the calculation reference value of the working load of the variable pitch bearing; is the calculation reference value of the working speed of the pitch bearing; μ z It is the reference value of the grease distribution amount of the zth injection pipe (5).

4. A pitch bearing lubrication system according to claim 2, characterized in that: The data verification unit includes: A metering subunit, used to obtain the total amount of grease flowing through the injection pipe (5) during the filling period and the amount of grease flowing through the recovery pipe (6) during the recovery period; A standard acquisition subunit is used to acquire the grease distribution amount of each injection pipe (5) in the current filling period as the injection standard value of the corresponding injection pipe (5), and to acquire the total grease flow rate of all injection pipes (5) in the previous filling period as the total recovery standard value of all recovery pipes (6); The alarm subunit generates an alarm when the deviation between the total grease flow rate of each injection pipe (5) and the corresponding injection standard value exceeds a preset second threshold value or the deviation between the total grease flow rate of all recovery pipes (6) and the total recovery standard value exceeds a preset third threshold value.

5. A pitch bearing lubrication system according to claim 1, characterized in that: The monitoring modules include: A camera, arranged on the inner top surface of the storage box (1), and used to capture a real-time image of the lubricating grease in the storage box (1); A quality assessment unit, used for regularly assessing the state of the lubricating grease in the storage box (1) based on a real-time image of the lubricating grease, and obtaining a result of assessing the state of the lubricating grease; The first alarm unit is used to sound an alarm when the status assessment result of the grease does not meet the use requirements, so as to remind the staff to replace the grease.

6. A pitch bearing lubrication system according to claim 5, characterized in that: The quality assessment units include: An image acquisition subunit is used to take a real-time image of the grease at a plurality of time points within a specified time range as an evaluation image; An evaluation parameter calculation subunit, used for calculating a state evaluation parameter of the grease based on the evaluation image; The result output subunit is used to output the state evaluation result of the grease based on the state evaluation parameter of the grease. When the state evaluation parameter of the grease is greater than or equal to a preset first threshold, the state evaluation result of the grease does not meet the use requirements. When the state evaluation parameter of the grease is less than the preset first threshold, the evaluation result meets the use requirements.

7. A pitch bearing lubrication system according to claim 6, characterized in that: The evaluation parameter calculation subunit includes: The region extraction block is used to randomly select several evaluation regions in each evaluation image; A pixel selection block is used to randomly select a number of evaluation pixels in each evaluation area; A pixel sorting block divides the evaluation pixels into color pixels and impurity pixels according to the pixel evaluation parameters; Condition evaluation block for calculating condition evaluation parameters of lubricating grease.

8. A pitch bearing lubrication system according to claim 7, characterized in that: The pixel sorting block divides color pixels and impurity pixels based on pixel evaluation parameters; S=|G s -G0|-G x ; Among them, S is the pixel evaluation parameter; G s is the gray value of the evaluation pixel; G0 is the gray reference value of the evaluation pixel; G x is the grayscale deviation judgment value of the evaluated pixel; || is the absolute value symbol; When the pixel evaluation parameter of the evaluation pixel is greater than or equal to 0, the evaluation pixel is a foreign pixel; when the pixel evaluation parameter of the evaluation pixel is less than 0, the evaluation pixel is a color pixel.

9. A pitch bearing lubrication system according to claim 7, characterized in that: The condition assessment block calculates the condition assessment parameters of the grease based on the following formula; Where P is the grease condition evaluation parameter; H is the total number of evaluation images; L k is the evaluation parameter of the kth evaluation image; F is the discriminant value of the evaluation parameter of the evaluation image; M k is the total number of evaluation regions in the kth evaluation image; is the rounding symbol; || is the absolute value symbol; N ik A is the total number of evaluation pixels in the i-th evaluation area of ​​the k-th evaluation image; ik is the total number of impurity pixels in the i-th evaluation area of ​​the k-th evaluation image; α1 and α2 are the calculation coefficients of the influence of grease color and the number of impurity pixels, respectively; G ijk is the gray value of the jth color pixel in the ith evaluation area of ​​the kth evaluation image; G0 is the reference value of the gray value of the evaluation pixel; G V is the discriminant value for evaluating the gray value deviation of the pixel; ln is the logarithmic function with e as the base; e is the natural base; Q k is the shooting time point corresponding to the kth evaluation image; Q1 is the shooting time point corresponding to the earliest evaluation image; L H is the evaluation parameter of the latest evaluation image; L1 is the evaluation parameter of the earliest evaluation image; Q H is the shooting time point of the latest evaluation image; B is the allowable deviation value of the evaluation parameter of the evaluation image; W is the grading basis of the deviation of the evaluation parameter.

Images