Fault diagnosis method for poor lubrication of rolling bearing and related equipment

Abstract

The invention provides a fault diagnosis method for poor lubrication of a rolling bearing and related equipment. The method comprises the following steps: acquiring a current resonance signal of the rolling bearing in equipment to be diagnosed; performing envelope detection on the current resonance signal to obtain a current envelope signal; acquiring a current envelope value and a current envelope spectrogram by using the current envelope signal; and based on the current envelope value, the current envelope spectrogram, the historical envelope value and the historical envelope spectrogram, judging whether the rolling bearing has a poor lubrication fault or not. According to the scheme, the current envelope value and the current envelope spectrogram are obtained through the current resonance signal of the rolling bearing. According to the current envelope value, the current envelope spectrogram, the historical envelope value and the historical envelope spectrogram, whether the rolling bearing has poor lubrication faults or not is judged, so that the poor lubrication faults of the rolling bearing are found in advance, the rolling bearing is prevented from still running under the condition that the lubrication state is deteriorated, and the service life of the rolling bearing is prolonged. The running performance of the rolling bearing is improved; and the service life of the rolling bearing is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical manufacturing, and particularly relates to a fault diagnosis method and related equipment for poor lubrication of rolling bearings. Background Art

[0002] Rolling bearings (which can be simply referred to as bearings) are widely used in machine transmission equipment. To ensure the normal operation of the bearings, the bearings need to be in a good lubrication state.

[0003] However, due to the influence of adverse factors such as on-site working conditions changes, environmental changes, and oil product problems, the lubrication state of the bearings will deteriorate, resulting in dry friction between the rolling elements and the raceways inside the bearings, and further causing the operating performance and service life of the bearings to decline.

[0004] Therefore, there is an urgent need for a method to diagnose the fault of "poor bearing lubrication" at present. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a fault diagnosis method and related equipment for poor lubrication of rolling bearings to diagnose the fault of "poor bearing lubrication".

[0006] To achieve the above object, embodiments of the present invention provide the following technical solutions:

[0007] A first aspect of embodiments of the present invention discloses a fault diagnosis method for poor lubrication of rolling bearings, the method comprising:

[0008] Collect the current resonance signal of the rolling bearing in the device to be diagnosed;

[0009] Perform envelope detection on the current resonance signal to obtain the current envelope signal;

[0010] Obtain the current envelope value and the current envelope spectrogram using the current envelope signal;

[0011] Based on the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram, determine whether there is a poor lubrication fault in the rolling bearing, where the historical envelope value and the historical envelope spectrogram are obtained based on the historical resonance signals collected historically.

[0012] Preferably, based on the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram, determining whether there is a poor lubrication fault in the rolling bearing includes:

[0013] Identify the first ground signal region of the current envelope spectrogram and identify the second ground signal region of the historical envelope spectrogram;

[0014] If the current envelope value is higher than the historical envelope value, and if the first base - foot signal area is larger than the second base - foot signal area, it is determined that there is a lubrication - deficiency fault in the rolling bearing;

[0015] If the current envelope value is less than or equal to the historical envelope value, and / or if the first base - foot signal area is less than or equal to the second base - foot signal area, it is determined that there is no lubrication - deficiency fault in the rolling bearing.

[0016] Preferably, obtaining the current envelope value and the current envelope spectrogram by using the current envelope signal includes:

[0017] Analyzing the current envelope signal to obtain the current envelope value;

[0018] Converting the current envelope signal into the frequency domain to obtain the current envelope spectrogram.

[0019] Preferably, collecting the current resonance signal of the rolling bearing in the device to be diagnosed includes:

[0020] Collecting the current vibration signal of the rolling bearing in the device to be diagnosed;

[0021] Analyzing the current resonance signal from the current vibration signal.

[0022] Preferably, it further includes:

[0023] If it is determined that there is a lubrication - deficiency fault in the rolling bearing, an alarm prompt and fault - handling measures are output.

[0024] In the second aspect of the embodiments of the present invention, a fault - diagnosis system for lubrication deficiency of a rolling bearing is disclosed. The system includes:

[0025] A collection unit, configured to collect the current resonance signal of the rolling bearing in the device to be diagnosed;

[0026] An envelope - detection unit, configured to perform envelope detection on the current resonance signal to obtain a current envelope signal;

[0027] An acquisition unit, configured to obtain the current envelope value and the current envelope spectrogram by using the current envelope signal;

[0028] A determination unit, configured to determine whether there is a lubrication - deficiency fault in the rolling bearing based on the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram, where the historical envelope value and the historical envelope spectrogram are obtained based on the historically collected historical resonance signals.

[0029] Preferably, the determination unit includes:

[0030] An identification module, configured to identify a first ground signal region of the current envelope spectrogram and a second ground signal region of a historical envelope spectrogram;

[0031] A first determination module, configured to determine that there is a lubrication deficiency fault in the rolling bearing if the current envelope value is higher than the historical envelope value and if the first ground signal region is larger than the second ground signal region;

[0032] A second determination module, configured to determine that there is no lubrication deficiency fault in the rolling bearing if the current envelope value is less than or equal to the historical envelope value and / or if the first ground signal region is less than or equal to the second ground signal region.

[0033] Preferably, the obtaining unit is specifically configured to: analyze the current envelope signal to obtain a current envelope value; and convert the current envelope signal into a frequency domain to obtain a current envelope spectrogram.

[0034] A third aspect of an embodiment of the present invention discloses an electronic device, including: a processor and a memory, where the processor and the memory are connected through a communication bus; wherein, the processor is configured to call and execute a program stored in the memory; the memory is configured to store a program, and the program is used to implement the fault diagnosis method for lubrication deficiency of a rolling bearing disclosed in the first aspect of the embodiment of the present invention.

[0035] A fourth aspect of an embodiment of the present invention discloses a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, it implements the fault diagnosis method for lubrication deficiency of a rolling bearing disclosed in the first aspect of the embodiment of the present invention.

[0036] Based on the above-mentioned fault diagnosis method for lubrication deficiency of a rolling bearing and related devices provided by the embodiment of the present invention, the method is as follows: collecting a current resonance signal of a rolling bearing in a device to be diagnosed; performing envelope detection on the current resonance signal to obtain a current envelope signal; using the current envelope signal to obtain a current envelope value and a current envelope spectrogram; and determining whether there is a lubrication deficiency fault in the rolling bearing based on the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram. In this solution, a current envelope value and a current envelope spectrogram are obtained through the current resonance signal of the rolling bearing. Then, based on the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram, it is determined whether there is a lubrication deficiency fault in the rolling bearing, so as to detect the lubrication deficiency fault of the rolling bearing earlier, avoid the rolling bearing from still running under the condition of deteriorated lubrication state, improve the operating performance of the rolling bearing, and extend the service life of the rolling bearing. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0038] Figure 1 Schematic diagram of the lubrication deficiency fault of the rolling bearing provided by the embodiment of the present invention;

[0039] Figure 2 Schematic diagram of the envelope in signal processing provided by the embodiment of the present invention;

[0040] Figure 3 Time-domain diagram of the impact energy provided by the embodiment of the present invention;

[0041] Figure 4 Frequency-domain diagram of the impact energy provided by the embodiment of the present invention;

[0042] Figure 5 Flowchart of a fault diagnosis method for lubrication deficiency of a rolling bearing provided by the embodiment of the present invention;

[0043] Figure 6 Example diagram of the envelope signal provided by the embodiment of the present invention;

[0044] Figure 7 Example diagram of the base signal area provided by the embodiment of the present invention;

[0045] Figure 8 Structure block diagram of a fault diagnosis system for lubrication deficiency of a rolling bearing provided by the embodiment of the present invention. Detailed implementation manners

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0047] In this application, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0048] Rolling bearings (which can be simply referred to as bearings) are widely used in machine transmission equipment and are very important transmission components. To ensure the normal operation of the bearings, the bearings need to be in a good lubrication state.

[0049] However, due to the influence of adverse factors such as on-site working condition changes, environmental changes and oil product problems, the lubrication state of the bearings will deteriorate, resulting in dry friction between the rolling elements and the raceways inside the bearings, and reducing the operating performance of the bearings. This kind of friction usually appears as early local friction. Since the specificity of this kind of friction fault is not strong, the existing methods for monitoring the operating state of bearings (such as monitoring through temperature, sound, etc.) cannot diagnose the occurrence of this kind of fault well, and it is very easy to miss the window period for fault handling, thus further expanding and developing the fault, reducing the reliability of the bearing operation and shortening the service life of the bearings.

[0050] Therefore, this solution proposes a fault diagnosis method and related equipment for poor lubrication of rolling bearings, obtaining the current envelope value and the current envelope spectrogram through the current resonance signal of the rolling bearing. Then, based on the current envelope value, the current envelope spectrogram, the historical envelope value and the historical envelope spectrogram, it is determined whether there is a poor lubrication fault in the rolling bearing, so as to detect the poor lubrication fault of the rolling bearing earlier, avoid the rolling bearing from still operating under the condition of deteriorated lubrication state, improve the operating performance of the rolling bearing and extend the service life of the rolling bearing.

[0051] To better understand the content of the subsequent embodiments of this solution, the implementation principle of this solution is explained here first, mainly from two aspects: "explanation of the poor lubrication fault of rolling bearings" and "diagnosis principle of the poor lubrication fault of rolling bearings" to explain the implementation principle of this solution.

[0052] I. Explanation of the poor lubrication fault of rolling bearings:

[0053] Poor lubrication means that the oil film is not well formed during the operation of rolling bearings (hereinafter referred to as bearings), resulting in relative friction between moving parts. This usually occurs in grease-lubricated equipment (such as motors and pumps). Especially in winter, the temperature is low and the grease has poor fluidity, which easily leads to the occurrence of poor lubrication faults in bearings.

[0054] When the bearing has a lubrication failure, it will cause the oil film not to form well, and the moving contact surfaces cannot be completely separated by the oil film, resulting in relative friction between the rolling elements and the inner and outer rings during the rotation of the bearing. As Figure 1 can be seen from the schematic diagram of the lubrication failure of the rolling bearing shown, microscopically, this friction is actually the mutual collision between the "high points" of the two contact surfaces.

[0055] The collision between the rolling elements of the bearing and the "high points" on the raceway surface will generate impact energy, and this impact energy can be evaluated by measuring the "envelope value" of the bearing, and the lubrication failure of the bearing can be diagnosed by in-depth analysis of the envelope value.

[0056] II. Explanation of the diagnosis principle of the lubrication failure of rolling bearings:

[0057] In signal processing, as Figure 2 can be seen from the schematic diagram of the envelope in signal processing shown, the envelope refers to the curve of the amplitude changing with time. Figure 2 The left half of it is the vibration signal generated during the operation of the equipment, which is a single sine vibration signal. However, due to the influence of the working conditions, the peak value of the amplitude fluctuates up and down. At this time, it can be assumed that a curve is used to connect each point of the amplitude peak value, and this curve is the envelope line of the equipment vibration signal.

[0058] When the bearing has a lubrication failure, the high points on the surface will also generate impact energy during contact, and the time-domain diagram of the impact energy is as Figure 3 shown. The mathematical expression of the impact energy is the following formula (1).

[0059] (1);

[0060] In formula (1), represents the amplitude, t represents time; the meaning represented by formula (1) is: when t = 0 (i.e., the starting moment, or any other moment, the expression is different), the energy tends to infinity, and the energy is zero at any time other than t = 0.

[0061] Formula (1) shows that the ideal impact energy is a time-domain signal with an infinitely short time and an infinitely large energy. By performing a Fourier transform on this time-domain signal through formula (2), a frequency-domain signal can be obtained.

[0062] (2);

[0063] In formula (2), F represents the Fourier transform of , is the transformation rule, and f represents the frequency.

[0064] As Figure 4 shown in the frequency-domain diagram of the impact energy, after the Fourier transform of the impact signal (the impact energy is the time-domain signal), the physical meaning expressed by its transformation result is that the impact signal will generate an energy signal covering the entire frequency band with uniform intensity, that is, vibration energy exists at all frequencies.

[0065] Therefore, the impact energy will perform a "frequency scan" on the contact components. When it covers the natural frequency of the components, it will excite the vibration of the components and cause resonance. Since the duration of the impact energy is very short, the resonance signal generated by the components will decay quickly. By performing envelope detection on the resonance signal of the components, an envelope signal can be obtained. Subsequently, whether there is a lubrication defect in the rolling bearing can be determined through the obtained envelope signal. The specific method for determining whether there is a lubrication defect in the rolling bearing will be described in detail in the following embodiments.

[0066] It should be noted that the above formulas (1) and (2) indicate that the impact energy will form a broadband energy signal in the frequency-domain signal, and this energy signal will cover the resonance frequency of the components and excite resonance.

[0067] When the bearing is poorly lubricated, due to the poor formation of the oil film, friction will occur between the two contact surfaces. Microscopically, this friction is manifested as the collision of high points with high points, and this collision will generate impact energy and excite resonance. Therefore, the principles expressed by the above formulas (1) and (2) can be applied to determine "poor lubrication of the rolling bearing".

[0068] The above is the description of the implementation principle of this solution. This solution realizes "determining whether there is a lubrication defect in the rolling bearing" based on the above implementation principle. For details, please refer to the following embodiments.

[0069] See Figure 5 , which shows a flowchart of a fault diagnosis method for poor lubrication of a rolling bearing provided by an embodiment of the present invention. The fault diagnosis method includes:

[0070] Step S501: Collect the current resonance signal of the rolling bearing in the device to be diagnosed.

[0071] In the specific process of implementing step S501, collect the current vibration signal of the rolling bearing in the device to be diagnosed, and parse the current resonance signal from the current vibration signal. Among them, the device to be diagnosed is a device such as a motor or a pump.

[0072] Specifically, use an acceleration vibration sensor to continuously and real-time collect the current vibration signal of the rolling bearing, and then parse the current resonance signal from the collected current vibration signal.

[0073] It should be noted that the acceleration vibration sensor collects vibration signals on-site for 1.6 seconds to 6.4 seconds (continuous collection within this time period). The duration of the resonance signal is usually only a few milliseconds. Therefore, the collection time of the acceleration vibration sensor is fully capable of meeting the collection of vibration signals.

[0074] When collecting the current resonance signal of the rolling bearing, the current resonance signals of all components of the equipment to be diagnosed are collected. However, in this solution, the key analysis is on the current resonance signals of the inner and outer rings of the rolling bearing.

[0075] When the acceleration vibration sensor collects vibration signals, it will record the vibration position information of the measured object (such as the rolling bearing) in real time. During the operation of the rolling bearing, impact energy is generated, which will form a resonance decay signal in the original time-domain signal of the vibration signal. This is the original signal recorded by the acceleration vibration sensor in real time without being processed or converted.

[0076] In this solution, the acceleration vibration sensor is only responsible for recording the current vibration signal of the measured object, and through further analysis of this current vibration signal, the current resonance signal can be resolved.

[0077] Step S502: Perform envelope detection on the current resonance signal to obtain the current envelope signal.

[0078] In the specific process of implementing step S502, envelope detection is performed on the current resonance signal of the rolling bearing to obtain the current envelope signal.

[0079] It should be noted that after the impact energy excites the resonance of the component, due to the existence of damping, the resonance signal will decay quickly. Connecting the peak points of the decay signal will form the envelope line of the resonance decay signal. This process is envelope detection.

[0080] On this basis, by performing envelope detection on the current resonance signal of the rolling bearing, the current envelope signal can be obtained.

[0081] For example: Perform envelope detection on the current resonance signal of the rolling bearing, and the obtained current envelope signal is as Figure 6 shown.

[0082] Step S503: Use the current envelope signal to obtain the current envelope value and the current envelope spectrogram.

[0083] It should be noted that the envelope signal is quantified by the envelope value (such as 5.2, 7.8, etc.). That is, the envelope value is a parameter used to quantify the size of the envelope signal. The larger the envelope value, the greater the energy of the envelope signal.

[0084] The envelope spectrum diagram (which can be simply referred to as the envelope spectrum) is the manifestation of the envelope signal in the frequency domain. The horizontal axis of the envelope spectrum diagram represents frequency, and the vertical axis represents amplitude.

[0085] In the process of specifically implementing step S503, the current envelope signal is analyzed to obtain the corresponding current envelope value, which is used to quantify the energy magnitude of the current envelope signal; the current envelope signal is transformed into the frequency domain to obtain the corresponding current envelope spectrum diagram.

[0086] From the content of the above steps S501 to S503, it can be seen that the data flow for obtaining the current envelope value and the current envelope spectrum diagram is as follows: the current envelope signal is obtained using the current resonance signal, and then the current envelope value and the current envelope spectrum diagram are obtained using the current envelope signal.

[0087] It should be noted that since the collision between the high points of the rolling bearing components is a completely random process, the current envelope signal obtained through envelope detection has no regularity. Through research, it is found that when the rolling bearing has a lubrication defect fault, its main characteristics are manifested as "the increase of the envelope value" and "the enhancement of the pedestal signal in the envelope spectrum diagram". Therefore, it is necessary to use the current envelope signal to obtain the current envelope value and the current envelope spectrum diagram, and then use the current envelope value and the current envelope spectrum diagram to determine whether the rolling bearing has a lubrication defect fault.

[0088] Step S504: Based on the current envelope value, the current envelope spectrum diagram, the historical envelope value, and the historical envelope spectrum diagram, determine whether the rolling bearing has a lubrication defect fault.

[0089] It should be noted that the historical envelope value and the historical envelope spectrum diagram are obtained based on the historical resonance signals collected historically. For the acquisition method of the historical envelope value and the historical envelope spectrum diagram, reference can be made to the above-mentioned acquisition process of "the current envelope value and the current envelope spectrum diagram", which will not be elaborated here.

[0090] In the process of specifically implementing step S504, the first pedestal signal region of the current envelope spectrum diagram is identified, and the second pedestal signal region of the historical envelope spectrum diagram is identified.

[0091] If the current envelope value is higher than the historical envelope value (indicating an increase or enlargement of the envelope value), and if the first pedestal signal region is larger than the second pedestal signal region (indicating the enhancement of the pedestal signal in the envelope spectrum diagram), it is determined that the rolling bearing has a lubrication defect fault.

[0092] That is, if the envelope value increases and the pedestal signal is enhanced, it is determined that the rolling bearing has a lubrication defect fault.

[0093] If the current envelope value is less than or equal to the historical envelope value (indicating that the envelope value has not increased), and / or, if the first base signal region is less than or equal to the second base signal region (indicating that the base signal has not increased), it is determined that there is no lubrication defect fault in the rolling bearing.

[0094] Specifically, "the first base signal region is larger than the second base signal region" specifically means that the area of the first base signal region is larger than the area of the second base signal region.

[0095] For example, the base signal region in the envelope spectrogram is as Figure 7 shown. The base signal region in the current envelope spectrogram is called the first base signal region, and the base signal region in the historical envelope spectrogram is called the second base signal region; when the area of the first base signal region is larger than the area of the second base signal region (that is, Figure 7 the area of the base signal region in

[0096] In other words, if the area of the first base signal region obtained from the current detection is significantly larger than the area of the second base signal region obtained from the previous detection, it can be determined that the base signal has increased.

[0097] It can be seen from the content of the above steps S501 - S504 that for a rolling bearing, this solution can determine whether there is a lubrication defect fault in the rolling bearing through the change trend of the envelope value and the analysis of the envelope spectrogram.

[0098] In practical applications, this solution can be applied to a single grease lubrication device (device to be diagnosed) when the environmental temperature is relatively low; in production practice, when it is detected that the envelope value of the rolling bearing increases and the base signal increases, it can be determined that there is a lubrication defect fault in the rolling bearing, and at this time, corresponding countermeasures can be considered as a priority.

[0099] In some specific embodiments, if it is determined that there is a lubrication defect fault in the rolling bearing, an alarm prompt and a fault handling measure are output.

[0100] Among them, for the lubrication defect fault of the rolling bearing, the fault handling measure (that is, the countermeasure) can be: when it is determined on site that there is a lubrication defect fault in the rolling bearing of the device to be diagnosed, the device to be diagnosed can be refueled and the refueling interval can be shortened.

[0101] It has been found through on-site practice that the earlier the fault is handled, the lubrication defect fault can be effectively suppressed and eliminated, the further development of the fault can be avoided, and the reliability of the equipment operation can be improved.

[0102] To better reflect the effect of this solution in diagnosing lubrication defect faults, the following is an example for illustration:

[0103] During the equipment inspection, it was found that the envelope value of the rolling bearing of a pump drive motor (i.e. the equipment to be diagnosed) had a significant upward trend. The current envelope value increased by about 60% compared with the historical envelope value collected previously, and the grease showed signs of blackening. In addition, the vibration of the pump drive motor was normal, with no obvious abnormal noise, and there were no other abnormal phenomena on site.

[0104] Through data analysis based on this solution, the motor status data of a pump drive motor is mainly manifested as follows: the envelope value increases and the ground signal in the envelope spectrum diagram increases.

[0105] As described in this solution, abnormal friction caused by poor lubrication usually leads to an increase in the envelope value and an increase in the ground signal. At the same time, friction also generates heat. When heat accumulates in the bearing seat, it causes the temperature to rise and the grease color to change. The grease on site showed signs of blackening, but the degree was not large, indicating that the friction was not serious for the time being. Comprehensive analysis shows that the envelope value of a pump drive motor should be increased due to poor bearing lubrication. It is in the early stage of failure. It is recommended to add oil first and then observe.

[0106] According to the diagnosis conclusion, after the oil was added to the drive motor of a pump, the envelope value dropped significantly, which further verified the judgment of the fault. Due to the timely discovery, after improving the lubrication condition of the motor, the envelope value did not increase again, eliminating the hidden danger of the fault. Since then, the motor has been running normally without any abnormal phenomenon.

[0107] It can be seen from the above examples that this solution can detect poor lubrication faults early and provide corresponding fault handling measures to intervene in advance, avoid further development of the fault, improve the operating reliability of the equipment and extend the service life of the equipment.

[0108] Corresponding to the fault diagnosis method for poor lubrication of rolling bearings provided in the above embodiment of the present invention, see Figure 8 The embodiment of the present invention also provides a structural block diagram of a rolling bearing lubrication failure diagnosis system, the failure diagnosis system comprising: a collection unit 100, an envelope detection unit 200, an acquisition unit 300 and a determination unit 400.

[0109] The acquisition unit 100 is used to acquire the current resonance signal of the rolling bearing in the device to be diagnosed.

[0110] In a specific implementation, the acquisition unit 100 is specifically used to: acquire the current vibration signal of the rolling bearing in the device to be diagnosed; and parse out the current resonance signal from the current vibration signal.

[0111] The envelope detection unit 200 is used to perform envelope detection on the current resonance signal to obtain a current envelope signal.

[0112] An acquisition unit 300, configured to obtain a current envelope value and a current envelope spectrogram by using a current envelope signal.

[0113] In a specific implementation, the acquisition unit 300 is specifically configured to: parse the current envelope signal to obtain a current envelope value; and convert the current envelope signal to a frequency domain to obtain a current envelope spectrogram.

[0114] A determination unit 400, configured to determine whether a rolling bearing has a lubrication deficiency fault based on the current envelope value, the current envelope spectrogram, a historical envelope value, and a historical envelope spectrogram, where the historical envelope value and the historical envelope spectrogram are obtained based on a historical resonance signal collected historically.

[0115] In an embodiment of the present invention, a current envelope value and a current envelope spectrogram are obtained through a current resonance signal of a rolling bearing, and then it is determined whether the rolling bearing has a lubrication deficiency fault according to the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram, so as to discover the lubrication deficiency fault of the rolling bearing earlier, avoid the rolling bearing from still operating when the lubrication state deteriorates, improve the operating performance of the rolling bearing, and extend the service life of the rolling bearing.

[0116] Preferably, in combination with Figure 8 the content shown, the determination unit 400 includes an identification module, a first determination module, and a second determination module, and the execution principles of each module are as follows:

[0117] The identification module is configured to identify a first ground signal region of the current envelope spectrogram and identify a second ground signal region of the historical envelope spectrogram.

[0118] The first determination module is configured to determine that the rolling bearing has a lubrication deficiency fault if the current envelope value is higher than the historical envelope value and if the first ground signal region is larger than the second ground signal region.

[0119] The second determination module is configured to determine that the rolling bearing does not have a lubrication deficiency fault if the current envelope value is less than or equal to the historical envelope value and / or if the first ground signal region is less than or equal to the second ground signal region.

[0120] Preferably, the fault diagnosis system further includes:

[0121] An output unit, configured to output an alarm prompt and a fault handling measure if it is determined that the rolling bearing has a lubrication deficiency fault.

[0122] Preferably, an embodiment of the present invention further provides an electronic device, including: a processor and a memory, where the processor and the memory are connected through a communication bus; where the processor is configured to call and execute a program stored in the memory; and the memory is configured to store a program, and the program is used to implement the fault diagnosis method for lubrication deficiency of a rolling bearing provided in the foregoing method embodiment.

[0123] Preferably, the embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the fault diagnosis method for poor lubrication of a rolling bearing provided by the above method embodiment is implemented.

[0124] In summary, the embodiment of the present invention provides a fault diagnosis method and related equipment for poor lubrication of a rolling bearing. By obtaining the current envelope value and the current envelope spectrogram from the current resonance signal of the rolling bearing, and then judging whether there is a poor lubrication fault of the rolling bearing according to the current envelope value, the current envelope spectrogram, the historical envelope value and the historical envelope spectrogram, the poor lubrication fault of the rolling bearing can be detected early, so as to avoid the rolling bearing from still running under the condition of deteriorating lubrication state, improve the operating performance of the rolling bearing and extend the service life of the rolling bearing.

[0125] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, it is described relatively simply, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0126] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0127] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fault diagnosis method for poor lubrication of a rolling bearing, characterized in that, The method includes: Collecting the current resonance signal of the rolling bearing in the device to be diagnosed; Performing envelope detection on the current resonance signal to obtain a current envelope signal; Using the current envelope signal to obtain a current envelope value and a current envelope spectrogram; Based on the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram, determining whether there is a lubrication deficiency fault in the rolling bearing, where the historical envelope value and the historical envelope spectrogram are obtained based on historical resonance signals collected historically.

2. The method according to claim 1, wherein Based on the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram, determining whether there is a lubrication deficiency fault in the rolling bearing includes: Identifying a first ground signal region of the current envelope spectrogram and identifying a second ground signal region of the historical envelope spectrogram; If the current envelope value is higher than the historical envelope value, and if the first ground signal region is larger than the second ground signal region, determining that there is a lubrication deficiency fault in the rolling bearing; If the current envelope value is lower than or equal to the historical envelope value, and / or if the first ground signal region is smaller than or equal to the second ground signal region, determining that there is no lubrication deficiency fault in the rolling bearing.

3. The method according to claim 1, characterized in that, Using the current envelope signal to obtain a current envelope value and a current envelope spectrogram includes: Analyzing the current envelope signal to obtain a current envelope value; Converting the current envelope signal to the frequency domain to obtain a current envelope spectrogram.

4. The method according to claim 1, wherein Collecting the current resonance signal of the rolling bearing in the device to be diagnosed includes: Collecting the current vibration signal of the rolling bearing in the device to be diagnosed; Analyzing the current resonance signal from the current vibration signal.

5. The method according to claim 2, characterized in that, It further includes: If it is determined that there is a lubrication deficiency fault in the rolling bearing, outputting an alarm prompt and a fault handling measure.

6. A fault diagnosis system for poor lubrication of a rolling bearing, characterized in that, The system includes: A collection unit for collecting the current resonance signal of the rolling bearing in the device to be diagnosed; An envelope detection unit for performing envelope detection on the current resonance signal to obtain a current envelope signal; An acquisition unit for using the current envelope signal to obtain a current envelope value and a current envelope spectrogram; A determination unit for determining whether there is a lubrication deficiency fault in the rolling bearing based on the current envelope value, the current envelope spectrogram, the historical envelope value, and the historical envelope spectrogram, where the historical envelope value and the historical envelope spectrogram are obtained based on historical resonance signals collected historically.

7. The system according to claim 6, wherein The determination unit includes: An identification module for identifying a first ground signal region of the current envelope spectrogram and identifying a second ground signal region of the historical envelope spectrogram; A first determination module for determining that there is a lubrication deficiency fault in the rolling bearing if the current envelope value is higher than the historical envelope value and if the first ground signal region is larger than the second ground signal region; A second determination module for determining that there is no lubrication deficiency fault in the rolling bearing if the current envelope value is lower than or equal to the historical envelope value and / or if the first ground signal region is smaller than or equal to the second ground signal region.

8. The system according to claim 6, characterized in that, The obtaining unit is specifically configured to: analyze the current envelope signal to obtain a current envelope value; and transform the current envelope signal into the frequency domain to obtain a current envelope spectrogram.

9. An electronic device, characterized in that, Including: a processor and a memory, the processor and the memory are connected through a communication bus; wherein, the processor is configured to call and execute a program stored in the memory; the memory is configured to store a program, and the program is used to implement the fault diagnosis method for poor lubrication of a rolling bearing as described in any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, A computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, it implements the fault diagnosis method for poor lubrication of a rolling bearing as described in any one of claims 1-5.

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