Method and system for monitoring health state of slewing bearing
By monitoring the axial and radial displacement changes of the outer ring of the slewing bearing relative to the inner ring, and using non-contact displacement sensors and controllers for dual-dimensional cross-verification, the problems of inaccurate monitoring and susceptibility to interference in existing technologies are solved, achieving efficient and accurate fault identification and extending the life of the monitoring system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XCMG EXCAVATOR MACHINERY CO LTD
- Filing Date
- 2026-02-02
- Publication Date
- 2026-05-08
AI Technical Summary
Existing technologies for monitoring the health of slewing bearings are easily affected by excavator operation vibrations and external environmental dust and foreign objects, and it is difficult to accurately distinguish between raceway wear and bolt loosening. Traditional detection methods are inefficient.
By monitoring the axial and radial displacement changes of the outer ring of the slewing bearing relative to the inner ring, non-contact displacement sensors are used to acquire the displacement amplitude in real time. The controller is used for two-dimensional cross-verification, and displacement waveform features are extracted to identify faults.
It improves the accuracy of fault identification, can accurately distinguish between raceway wear and bolt loosening, reduces operational interference and environmental impact, and does not require modification of the slewing bearing, thus extending the life of the monitoring system.
Smart Images
Figure CN121994468A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of slewing bearing fault monitoring technology, and relates to a slewing bearing health status monitoring method and system, specifically a slewing bearing health status monitoring method and system based on clearance monitoring. Background Technology
[0002] Slewing bearing raceway wear and loose bolts are common excavator malfunctions.
[0003] Current technologies primarily monitor the health of slewing bearings by collecting and analyzing signals such as noise and vibration, or by periodically disassembling and testing the content of grease and iron filings. However, the monitoring results are more susceptible to the influence of excavator operation vibrations and external environmental dust and foreign objects. Traditional testing requires disassembling components, which is inefficient; existing noise and vibration monitoring methods are easily affected by operational interference and cannot effectively distinguish between raceway damage and loose bolts. Summary of the Invention
[0004] Objective: In view of at least one of the above technical problems, this application provides a method and system for monitoring the health status of slewing bearings. By monitoring the axial and radial displacement changes of the outer ring relative to the inner ring and performing cross-verification in two dimensions, the accuracy of fault identification is improved.
[0005] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows:
[0006] In one aspect, a slewing bearing health status monitoring system is provided, including a controller and a first non-contact displacement sensor and a second non-contact displacement sensor;
[0007] The first non-contact displacement sensor is used to detect the amplitude of the axial displacement of the outer ring of the slewing bearing relative to the inner ring and upload it to the controller.
[0008] The second non-contact displacement sensor is used to detect the radial displacement amplitude of the outer ring of the slewing bearing relative to the inner ring and upload it to the controller.
[0009] The controller is connected to the first non-contact displacement sensor and the second non-contact displacement sensor respectively.
[0010] In some embodiments, the first non-contact displacement sensor is screwed into the axial displacement sensor mounting hole in the axial displacement sensor mounting base, the axial displacement sensor mounting base is screwed into the axial displacement sensor mounting hole in the turntable base plate, and the first non-contact displacement sensor is axially oriented toward the inner ring of the slewing bearing.
[0011] The second non-contact displacement sensor is screwed into the radial displacement sensor mounting hole in the radial displacement sensor mounting base, and the radial displacement sensor mounting base is screwed into the radial displacement sensor mounting hole in the turntable base plate. The second non-contact displacement sensor is radially oriented towards the inner wall of the grease pool, and the inner wall of the grease pool is stationary relative to the inner ring of the slewing bearing.
[0012] The turntable base plate is fixed to the outer ring of the slewing bearing.
[0013] In some embodiments, the axial displacement sensor mounting base has a wire-passing hole that communicates with the axial displacement sensor mounting hole, for the signal line and power line of the first non-contact displacement sensor to pass through.
[0014] The radial displacement sensor mounting base has a radial displacement sensor mounting base wire hole that communicates with the radial displacement sensor mounting hole, for the signal line and power line of the second non-contact displacement sensor to pass through.
[0015] In some embodiments, the outer periphery of the axial displacement sensor mounting base is provided with an axial displacement sensor mounting base thread for threaded connection with the turntable base plate.
[0016] The radial displacement sensor mounting base has a radial displacement sensor mounting base thread on its outer periphery for threaded connection with the turntable base plate.
[0017] In some embodiments, the axial displacement sensor mounting base is fixed in the turntable base plate by tightening the first locking nut; the radial displacement sensor mounting base is fixed in the turntable base plate by tightening the second locking nut.
[0018] Secondly, a method for monitoring the health status of a slewing bearing is provided, based on the aforementioned slewing bearing health status monitoring system, the method comprising:
[0019] Real-time acquisition of the axial displacement amplitude A and radial displacement amplitude B of the outer ring of the target slewing bearing relative to the inner ring;
[0020] Based on the axial displacement amplitude A and radial displacement amplitude B per unit time, determine the difference in axial displacement amplitude ΔA and radial displacement amplitude ΔB per unit time.
[0021] Based on the axial displacement amplitude A and radial displacement amplitude B over a continuous period of time, extract the axial displacement waveform features and radial displacement waveform features;
[0022] If the axial displacement amplitude A or the radial displacement amplitude B undergoes a periodic step change or abrupt change, it is determined that the bolts of the slewing bearing are loose. Specifically, a periodic step change in the axial displacement amplitude A means that the difference in axial displacement amplitude ΔA occurs at the same time in multiple consecutive periods and is simultaneously greater than the difference in axial displacement amplitude of the next unit time and the difference in axial displacement amplitude of the previous unit time. Similarly, a periodic step change in the radial displacement amplitude B means that the difference in radial displacement amplitude ΔB occurs at the same time in multiple consecutive periods and is simultaneously greater than the difference in radial displacement amplitude of the next unit time and the difference in radial displacement amplitude of the previous unit time.
[0023] A sudden change in axial displacement amplitude A indicates that during the normal wear stage, the axial displacement amplitude A at a certain time is greater than or equal to the corresponding axial clearance limit value Amax, and the difference in axial displacement amplitude is simultaneously greater than the difference in axial displacement amplitude of the next unit time and the difference in axial displacement amplitude of the previous unit time; a sudden change in radial displacement amplitude B indicates that during the normal wear stage, the radial displacement amplitude B at a certain time is greater than or equal to the corresponding radial clearance limit value Bmax, and the difference in radial displacement amplitude is simultaneously greater than the difference in radial displacement amplitude of the next unit time and the difference in radial displacement amplitude of the previous unit time.
[0024] In some embodiments, after determining the axial displacement amplitude difference ΔA and the radial displacement amplitude difference ΔB per unit time, the method further includes:
[0025] If at least one of the following conditions occurs: (a) the axial displacement amplitude A reaches the axial clearance limit value Amax, and the axial displacement amplitude difference ΔA continues to increase (i.e., the axial displacement amplitude difference is less than the axial displacement amplitude difference in the next unit time but greater than the axial displacement amplitude difference in the previous unit time); (b) the radial displacement amplitude B reaches the radial clearance limit value Bmax, and the radial displacement amplitude difference ΔB continues to increase (i.e., the radial displacement amplitude difference is less than the radial displacement amplitude difference in the next unit time but greater than the radial displacement amplitude difference in the previous unit time); (c) the axial displacement amplitude difference ΔA continues to increase, and the axial displacement amplitude difference in a unit time is more than 3 times the axial displacement amplitude difference in the previous unit time; (d) the radial displacement amplitude difference ΔB continues to increase, and the radial displacement amplitude difference in a unit time is more than 3 times the radial displacement amplitude difference in the previous unit time; then the raceway is judged to be excessively worn.
[0026] Furthermore, after determining that the raceway is excessively worn, the system also includes: issuing an alarm for excessive raceway wear and reminding the user to replace the slewing bearing.
[0027] Furthermore, after determining that the bolts of the slewing bearing are loose, the procedure also includes: issuing a bolt loosening alarm.
[0028] Thirdly, a slewing bearing health status monitoring system is provided, wherein the controller includes a processor and a storage medium;
[0029] The storage medium is used to store instructions;
[0030] The processor is configured to operate according to the instructions to execute the method.
[0031] Fourthly, an engineering machine is provided, which is equipped with the aforementioned slewing bearing health status monitoring system.
[0032] Compared with the prior art, the beneficial effects achieved by this application are as follows: The slewing bearing health status monitoring method and system provided by this application have the following advantages:
[0033] 1. By monitoring the amplitude of axial and radial displacement of the outer ring relative to the inner ring (which directly reflects changes in axial and radial clearance), the cross-verification of axial and radial displacement changes improves the accuracy of fault identification.
[0034] 2. Accurately distinguish between excessive raceway wear and loose bolts by analyzing displacement waveform characteristics (step / jump);
[0035] 3. Compared with traditional monitoring methods such as vibration and noise, this method directly tests the axial and radial displacement of the outer ring relative to the inner ring, directly reflecting the axial and radial clearance, which is more accurate and less affected by operational interference and environmental factors.
[0036] 4. The use of non-contact test sensors eliminates the need to modify the slewing bearing, resulting in "0" wear and "0" damage to the slewing bearing. Furthermore, compared to contact monitoring, the absence of wear extends the lifespan of the monitoring system. Attached Figure Description
[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0038] Figure 1 This is a schematic diagram of the slewing bearing health status monitoring system according to an embodiment of this application;
[0039] Figure 2 for Figure 1 Schematic diagram of cross section in the middle AA direction;
[0040] Figure 3 for Figure 2 Enlarged view of point I in the middle;
[0041] Figure 4 for Figure 2 Enlarged schematic diagram at point II;
[0042] Figure 5 This is a schematic diagram of a slewing bearing health status monitoring method according to an embodiment of this application;
[0043] Figure 6 This is a schematic diagram of the axial displacement amplitude-time curve of the slewing bearing according to an embodiment of this application;
[0044] Figure 7 This is a schematic diagram of the radial displacement amplitude-time curve of the slewing bearing according to an embodiment of this application.
[0045] The reference numerals in the attached drawings are explained as follows: axial displacement sensor mounting base 1, axial displacement sensor mounting base through hole 1-1, axial displacement sensor mounting base thread 1-2, axial displacement sensor mounting hole 1-3, first locking nut 21, second locking nut 22, turntable base plate 3, axial displacement sensor mounting base mounting hole 3-1, turntable base plate slewing bearing mounting surface 3-2, radial displacement sensor mounting base mounting hole 3-3, slewing bearing outer ring 4, slewing bearing outer ring mounting surface 4-1, first non-contact displacement sensor 51, second non-contact displacement sensor 52, slewing bearing inner ring 6, slewing bearing inner ring upper surface 6-1, radial displacement sensor mounting base 7, radial displacement sensor mounting base through hole 7-1, radial displacement sensor mounting base thread 7-2, radial displacement sensor mounting hole 7-3, grease pool inner wall 8, grease pool inner wall surface 8-1; A represents the axial displacement amplitude, and B represents the radial displacement amplitude. Detailed Implementation
[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.
[0047] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between components in a specific orientation. If the specific orientation changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this application and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0048] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.
[0050] Example 1: This application provides a slewing bearing health status monitoring system, including a controller, the controller including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the following slewing bearing health status monitoring method;
[0051] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the slewing bearing health status monitoring system also includes:
[0052] The first non-contact displacement sensor 51 is used to detect the amplitude of the axial displacement of the outer ring of the slewing bearing relative to the inner ring and upload it to the controller.
[0053] The second non-contact displacement sensor 52 is used to detect the radial displacement amplitude of the outer ring of the slewing bearing relative to the inner ring and upload it to the controller.
[0054] The controller is connected to the first non-contact displacement sensor 51 and the second non-contact displacement sensor 52 respectively.
[0055] like Figure 3 As shown, the first non-contact displacement sensor 51 is screwed into the axial displacement sensor mounting hole 1-3 in the axial displacement sensor mounting base 1, and the axial displacement sensor mounting base 1 is screwed into the axial displacement sensor mounting hole 3-1 in the turntable base plate 3, and the first non-contact displacement sensor 51 is axially oriented towards the inner ring 6 of the slewing bearing.
[0056] It should be noted that the turntable base plate 3 is fixed to the slewing bearing outer ring mounting surface 4-1 of the slewing bearing outer ring 4 by bolts. Therefore, the axial and radial displacement amplitude of the slewing bearing outer ring relative to the inner ring is detected by monitoring the relative displacement between the turntable base plate 3 and the slewing bearing inner ring 6.
[0057] More specifically, the first non-contact displacement sensor 51 monitors the distance between the first non-contact displacement sensor 51 and the upper surface 6-1 of the inner ring of the slewing bearing, that is, the axial displacement amplitude A of the outer ring relative to the inner ring.
[0058] like Figure 4 As shown, the second non-contact displacement sensor 52 is screwed into the radial displacement sensor mounting hole 7-3 in the radial displacement sensor mounting base 7, and the radial displacement sensor mounting base 7 is screwed into the radial displacement sensor mounting hole 3-3 in the turntable base plate 3. The second non-contact displacement sensor 52 is radially oriented towards the inner wall 8 of the grease pool, and the inner wall 8 of the grease pool is stationary relative to the inner ring 6 of the slewing bearing.
[0059] More specifically, the second non-contact displacement sensor 52 monitors the distance between the second non-contact displacement sensor 52 and the inner wall surface 8-1 of the grease pool, that is, the radial displacement amplitude B of the outer ring relative to the inner ring.
[0060] Furthermore, the axial displacement sensor mounting base 1 is provided with an axial displacement sensor mounting base thread 1-2 on its outer periphery for threaded connection with the turntable base plate 3; the radial displacement sensor mounting base 7 is provided with a radial displacement sensor mounting base thread 7-2 on its outer periphery for threaded connection with the turntable base plate 3; the positions of the first non-contact displacement sensor 51 and the second non-contact displacement sensor 52 are adjusted by adjusting the thread engagement.
[0061] In this embodiment, the axial displacement sensor mounting base 1 is fixed in the turntable base plate 3 by tightening the first locking nut 21; the radial displacement sensor mounting base 7 is fixed in the turntable base plate 3 by tightening the second locking nut 22.
[0062] The axial displacement sensor mounting base 1 has a wire-passing hole 1-1 that communicates with the axial displacement sensor mounting hole 1-3, allowing the signal and power lines of the first non-contact displacement sensor 51 to pass through. Similarly, the radial displacement sensor mounting base 7 has a wire-passing hole 7-1 that communicates with the radial displacement sensor mounting hole 7-3, allowing the signal and power lines of the second non-contact displacement sensor 52 to pass through.
[0063] In this embodiment, the signal lines of the first non-contact displacement sensor 51 and the second non-contact displacement sensor 52 are connected to a data acquisition instrument or a computer to achieve signal connection with the controller.
[0064] Example 2: As Figure 5 As shown, this application also provides a method for monitoring the health status of a slewing bearing, based on the slewing bearing health status monitoring system described in Embodiment 1, the method comprising:
[0065] Real-time acquisition of the axial displacement amplitude A and radial displacement amplitude B of the outer ring of the target slewing bearing relative to the inner ring;
[0066] Based on the axial displacement amplitude A and radial displacement amplitude B per unit time, determine the difference in axial displacement amplitude ΔA and radial displacement amplitude ΔB per unit time.
[0067] Based on the axial displacement amplitude A and radial displacement amplitude B over a continuous period of time, extract the axial displacement waveform features and radial displacement waveform features;
[0068] If the axial displacement amplitude A or radial displacement amplitude B undergoes a periodic step change or abrupt change (indicating that the turntable base plate 3 or the lower vehicle mounting surface has separated from the outer ring mounting surface 4-1 of the slewing bearing, and a large change in displacement amplitude occurs, indicating that a bolt is loose at a certain position of the slewing bearing), then it is determined that the bolt of the slewing bearing is loose. Specifically, if the axial displacement amplitude A or radial displacement amplitude B undergoes a periodic step change or abrupt change, then it is determined that the bolt of the slewing bearing is loose. A periodic step change in axial displacement amplitude A is represented by the axial displacement amplitude difference ΔA occurring at the same time in multiple consecutive periods being greater than the axial displacement amplitude difference of the next unit time and the axial displacement amplitude difference of the previous unit time. A periodic step change in radial displacement amplitude B is represented by the radial displacement amplitude difference ΔB occurring at the same time in multiple consecutive periods being greater than the radial displacement amplitude difference of the next unit time and the radial displacement amplitude difference of the previous unit time.
[0069] A sudden change in axial displacement amplitude A indicates that during the normal wear stage (e.g., within 15,000 hours), the axial displacement amplitude A at a certain time is greater than or equal to the corresponding axial clearance limit value Amax, and the difference in axial displacement amplitude is simultaneously greater than the difference in axial displacement amplitude of the next unit time and the difference in axial displacement amplitude of the previous unit time; a sudden change in radial displacement amplitude B indicates that during the normal wear stage (e.g., within 15,000 hours), the radial displacement amplitude B at a certain time is greater than or equal to the corresponding radial clearance limit value Bmax, and the difference in radial displacement amplitude is simultaneously greater than the difference in radial displacement amplitude of the next unit time and the difference in radial displacement amplitude of the previous unit time.
[0070] This also includes: if at least one of the following conditions occurs: (a) the axial displacement amplitude A reaches the axial clearance limit value Amax, and the axial displacement amplitude difference ΔA continues to increase (i.e., the axial displacement amplitude difference is less than the axial displacement amplitude difference in the next unit time but greater than the axial displacement amplitude difference in the previous unit time); (b) the radial displacement amplitude B reaches the radial clearance limit value Bmax, and the radial displacement amplitude difference ΔB continues to increase (i.e., the radial displacement amplitude difference is less than the radial displacement amplitude difference in the next unit time but greater than the radial displacement amplitude difference in the previous unit time); (c) the axial displacement amplitude difference ΔA continues to increase, and the axial displacement amplitude difference in a unit time is more than 3 times the axial displacement amplitude difference in the previous unit time; (d) the radial displacement amplitude difference ΔB continues to increase, and the radial displacement amplitude difference in a unit time is more than 3 times the radial displacement amplitude difference in the previous unit time; then it is judged that the raceway is excessively worn (indicating that the slewing bearing raceway has entered a stage of rapid wear and the slewing bearing needs to be replaced in time).
[0071] In some embodiments, after determining that the raceway is excessively worn, the method further includes: issuing an alarm for excessive raceway wear and reminding the user to replace the slewing bearing.
[0072] In some embodiments, after determining that a bolt on the slewing bearing is loose, the method further includes: issuing a bolt loosening alarm. Furthermore, it may also remind the user to inspect the loose bolts on the slewing bearing.
[0073] It should be noted that, as Figure 6 , Figure 7 As shown, ΔA1 < ΔA2 (abnormal) and ΔA3 < ΔA2 (abnormal), ΔB1 < ΔB2 (abnormal) and ΔB3 < ΔB2 (abnormal). For example, as... Figure 6 As shown, ΔA1 is the difference in axial displacement amplitude from 0 to 5000h; ΔA2 is the difference in axial displacement amplitude from 5000h to 10000h; ΔA3 is the difference in axial displacement amplitude from 10000h to 15000h; ΔA4 is the difference in axial displacement amplitude from 15000h to 20000h; ΔA5 is the difference in axial displacement amplitude from 20000h to 25000h; and so on. Figure 7 As shown, ΔB1 is the difference in radial displacement amplitude from 0 to 5000h; ΔB2 is the difference in radial displacement amplitude from 5000h to 10000h; ΔB3 is the difference in radial displacement amplitude from 10000h to 15000h; ΔB4 is the difference in axial displacement amplitude from 15000h to 20000h; and ΔB5 is the difference in radial displacement amplitude from 20000h to 25000h.
[0074] When the system has been in operation for 10,000 hours, if an abnormality occurs (at 1,000 hours) where the difference in axial displacement amplitude per unit time ΔA2 (abnormal) is 1 mm and exceeds both ΔA1 (0.5 mm) and ΔA3 (0.5 mm), or if an abnormality occurs (at 1,000 hours) where the difference in radial displacement amplitude per unit time ΔB2 (abnormal) is 0.8 mm and exceeds both ΔB1 (0.4 mm) and ΔA3 (0.4 mm), it is determined that the bolt has become loose.
[0075] When the axial displacement amplitude or radial displacement amplitude changes abruptly after 10,000 hours of operation, and the value exceeds the corresponding limit value Amax (2 mm) and Bmax (1.6 mm), but ΔA2 still exceeds ΔA1 and ΔA3 at the same time, and ΔB2 still exceeds ΔB1 and ΔA3 at the same time, it is determined that the bolt has become loose.
[0076] When the slewing bearing has been in operation for 20,000 hours, and the axial displacement amplitude reaches the corresponding limit value Amax (2 mm), and the difference in axial displacement amplitude ΔA continues to increase, or the radial displacement amplitude reaches the corresponding limit value Bmax (1.6 mm), and the difference in radial displacement amplitude ΔB continues to increase, it is determined that the slewing bearing raceway has entered the stage of rapid wear and the slewing bearing needs to be replaced.
[0077] When the difference in axial displacement amplitude per unit time ΔA5 is greater than 3 times the difference in axial displacement amplitude per unit time ΔA4 of the previous unit time, or the difference in radial displacement amplitude per unit time ΔB5 is greater than 3 times the difference in radial displacement amplitude per unit time ΔB4 of the previous unit time, it is determined that the slewing bearing raceway has entered the stage of rapid wear, and the slewing bearing needs to be replaced.
[0078] Example 3: Based on Examples 1 and 2, this application provides a slewing bearing health status monitoring system, wherein the controller includes a processor and a storage medium;
[0079] The storage medium is used to store instructions;
[0080] The processor is configured to operate according to the instructions to execute the method.
[0081] Example 4: This application provides an engineering machinery equipped with the aforementioned slewing bearing health status monitoring system.
[0082] In some embodiments, the construction machinery may be an excavator.
[0083] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0084] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0085] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0086] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0087] The above description is only a preferred embodiment of this application. It should be noted that those skilled in the art should understand that various changes and improvements may be made to this application without departing from the principles and spirit. These improvements should also be considered within the scope of protection of this application and are not limited to the above embodiments.
Claims
1. A slewing bearing health status monitoring system, characterized in that, Includes a controller, a first non-contact displacement sensor, and a second non-contact displacement sensor; The first non-contact displacement sensor is used to detect the amplitude of the axial displacement of the outer ring of the slewing bearing relative to the inner ring and upload it to the controller. The second non-contact displacement sensor is used to detect the radial displacement amplitude of the outer ring of the slewing bearing relative to the inner ring and upload it to the controller. The controller is connected to the first non-contact displacement sensor and the second non-contact displacement sensor respectively.
2. The slewing bearing health status monitoring system according to claim 1, characterized in that, The first non-contact displacement sensor is screwed into the axial displacement sensor mounting hole in the axial displacement sensor mounting base, and the axial displacement sensor mounting base is screwed into the axial displacement sensor mounting hole in the turntable base plate, with the first non-contact displacement sensor facing the inner ring of the slewing bearing along the axial direction. The second non-contact displacement sensor is screwed into the radial displacement sensor mounting hole in the radial displacement sensor mounting base, and the radial displacement sensor mounting base is screwed into the radial displacement sensor mounting hole in the turntable base plate. The second non-contact displacement sensor is radially oriented towards the inner wall of the grease pool, and the inner wall of the grease pool is stationary relative to the inner ring of the slewing bearing. The turntable base plate is fixed to the outer ring of the slewing bearing.
3. The slewing bearing health status monitoring system according to claim 1, characterized in that, The axial displacement sensor mounting base has a wire-passing hole that communicates with the axial displacement sensor mounting hole, for the signal line and power line of the first non-contact displacement sensor to pass through. The radial displacement sensor mounting base has a radial displacement sensor mounting base wire hole that communicates with the radial displacement sensor mounting hole, for the signal line and power line of the second non-contact displacement sensor to pass through.
4. The slewing bearing health status monitoring system according to claim 1, characterized in that, The axial displacement sensor mounting base has an axial displacement sensor mounting base thread on its outer periphery for threaded connection with the turntable base plate. The radial displacement sensor mounting base has a radial displacement sensor mounting base thread on its outer periphery for threaded connection with the turntable base plate. And / or, the axial displacement sensor mounting base is fixed in the turntable base plate by tightening the first locking nut; the radial displacement sensor mounting base is fixed in the turntable base plate by tightening the second locking nut.
5. A method for monitoring the health status of a slewing bearing, characterized in that, Based on the slewing bearing health status monitoring system according to any one of claims 1 to 4, the method includes: Real-time acquisition of the axial displacement amplitude A and radial displacement amplitude B of the outer ring of the target slewing bearing relative to the inner ring; Based on the axial displacement amplitude A and radial displacement amplitude B per unit time, determine the difference in axial displacement amplitude ΔA and radial displacement amplitude ΔB per unit time. Based on the axial displacement amplitude A and radial displacement amplitude B over a continuous period of time, extract the axial displacement waveform features and radial displacement waveform features; If the axial displacement amplitude A or the radial displacement amplitude B undergoes a periodic step change or abrupt change, it is determined that the bolts of the slewing bearing are loose. Specifically, a periodic step change in the axial displacement amplitude A means that the difference in axial displacement amplitude ΔA occurs at the same time in multiple consecutive periods and is simultaneously greater than the difference in axial displacement amplitude of the next unit time and the difference in axial displacement amplitude of the previous unit time. Similarly, a periodic step change in the radial displacement amplitude B means that the difference in radial displacement amplitude ΔB occurs at the same time in multiple consecutive periods and is simultaneously greater than the difference in radial displacement amplitude of the next unit time and the difference in radial displacement amplitude of the previous unit time. A sudden change in axial displacement amplitude A indicates that during the normal wear stage, the axial displacement amplitude A at a certain time is greater than or equal to the corresponding axial clearance limit value Amax, and the difference in axial displacement amplitude is simultaneously greater than the difference in axial displacement amplitude of the next unit time and the difference in axial displacement amplitude of the previous unit time; a sudden change in radial displacement amplitude B indicates that during the normal wear stage, the radial displacement amplitude B at a certain time is greater than or equal to the corresponding radial clearance limit value Bmax, and the difference in radial displacement amplitude is simultaneously greater than the difference in radial displacement amplitude of the next unit time and the difference in radial displacement amplitude of the previous unit time.
6. The method for monitoring the health status of a slewing bearing according to claim 5, characterized in that, After determining the difference in axial displacement amplitude ΔA and the difference in radial displacement amplitude ΔB per unit time, the following is also included: If at least one of the following conditions occurs: (a) the axial displacement amplitude A reaches the axial clearance limit value Amax, and the axial displacement amplitude difference ΔA continues to increase; (b) the radial displacement amplitude B reaches the radial clearance limit value Bmax, and the radial displacement amplitude difference ΔB continues to increase; (c) the axial displacement amplitude difference ΔA continues to increase, and the axial displacement amplitude difference per unit time is more than 3 times the axial displacement amplitude difference per unit time of the previous unit time; (d) the radial displacement amplitude difference ΔB continues to increase, and the radial displacement amplitude difference per unit time is more than 3 times the radial displacement amplitude difference per unit time of the previous unit time; then the raceway is judged to be excessively worn.
7. The method for monitoring the health status of a slewing bearing according to claim 6, characterized in that, After determining that the raceway is excessively worn, the process also includes: issuing an alarm for excessive raceway wear and reminding the user to replace the slewing bearing.
8. The method for monitoring the health status of a slewing bearing according to claim 5, characterized in that, After determining that the bolts of the slewing bearing are loose, the procedure also includes: issuing a bolt loosening alarm.
9. The slewing bearing health status monitoring system according to claim 1, characterized in that, The controller includes a processor and a storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the slewing bearing health status monitoring method according to any one of claims 5-8.
10. An engineering machinery, characterized in that, It is equipped with a slewing bearing health status monitoring system as described in any one of claims 1 to 4 or claim 9.