Intelligent lubricating system based on texturing oil pit depth dynamic adjustment

Abstract

The invention relates to an intelligent lubricating system based on texturing oil pit depth dynamic adjustment. The intelligent lubricating system comprises a lower sample and an upper sample capable of rotating in the lower sample to form a friction pair. A plurality of oil pits are formed in the top friction surface of the lower sample, and an adjusting piece is arranged in each oil pit in an axial sliding manner and divides the oil pit into an upper lubricating area and a lower transition area. The device is provided with a first electric push rod for driving an adjusting part to axially move to adjust the depth of a lubricating area, and a one-way flow channel is formed in the adjusting part. When the adjusting piece moves downwards to compress the transition area, the lubricating oil forms directional flow towards the lubricating area through the one-way flow channel. When the upper sample rotates, lubricating oil in the lubricating area and the friction surface form an oil film to realize lubrication. The position of the adjusting piece is accurately controlled through the electric push rod, the lubricating area depth and the oil level height can be dynamically adjusted according to working condition requirements, and therefore the lubricating effect is optimized. According to the device, intelligent regulation and control of the lubricating performance are achieved, and the lubricating requirements under different working conditions are met.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent lubrication equipment, and in particular to an intelligent lubrication system based on dynamic adjustment of the depth of textured oil pits. Background Art

[0002] In fields such as mechanical transmission, aerospace, and energy equipment, friction and wear are key factors that lead to equipment performance degradation, increased energy consumption, and shortened service life. Effective lubrication technology can significantly reduce friction and wear, thereby improving the reliability and energy efficiency of mechanical systems.

[0003] Surface texturing technology is one of the important means to improve the lubrication performance of friction pairs. It processes micron- or nano-scale pits, grooves and other textures on the friction surface to store lubricating oil and promote the formation of oil film, thereby reducing friction and wear. However, traditional lubrication systems usually adopt static design and fixed parameter surface textures, which are difficult to adapt to dynamically changing working conditions. During actual operation, the lubricating oil will gradually be consumed due to splashing, evaporation or leakage, causing the oil level in the oil pit to drop. Since the depth of the traditional oil pit is fixed, the oil level may be in the optimal lubrication position during the initial design, but as the oil decreases, the oil level continues to drop, and may eventually fail to effectively cover the contact area of the friction pair, resulting in insufficient lubrication and increased wear.

[0004] Furthermore, most existing lubrication devices lack real-time adjustment capabilities and are unable to dynamically adjust the lubrication state based on operating conditions (such as load, speed, and temperature). This results in unstable lubrication and impacts equipment performance and lifespan. Therefore, there is an urgent need for an intelligent lubrication device that can adaptively adjust the lubrication state to optimize the lubrication performance of the friction pair.

[0005] To address these issues, the present invention proposes an intelligent lubrication system based on dynamic adjustment of the textured oil pit depth. By adjusting the lubrication zone depth and oil level in real time, this system ensures optimal lubrication under varying operating conditions, thereby improving equipment reliability and service life. In fields such as mechanical transmission, aerospace, and energy equipment, friction and wear are key factors contributing to equipment performance degradation, increased energy consumption, and shortened service life. Effective lubrication technology can significantly reduce friction and wear, thereby improving the reliability and energy efficiency of mechanical systems. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, adapt to actual needs, and provide an intelligent lubrication system based on dynamic adjustment of the depth of textured oil pits to solve the above technical problems.

[0007] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0008] Intelligent lubrication system based on dynamic adjustment of the depth of textured oil pits, including a lower specimen and an upper specimen that can rotate within the lower specimen to form a friction pair. A plurality of oil pits are evenly arranged in an array on the top friction surface of the lower specimen. A columnar adjusting member is slidably arranged axially within the oil pits. The adjusting member divides the oil pits into an upper lubrication zone and a lower transition zone. A first electric push rod for precisely driving the adjusting member to move up and down is arranged within the lower specimen to dynamically change the depth of the lubrication zone. A one-way flow channel is arranged within the adjusting member. When the adjusting member moves downward, it compresses the space in the transition zone, forcing the internal lubricating oil to flow directionally along the one-way flow channel towards the lubrication zone.

[0009] Further, the adjusting member includes a cylindrical body with an upward opening. A end cap is arranged at the top of the cylindrical body. A convex portion is integrally formed at the bottom of the end cap. A sealing ring for sealing the connection between the cylindrical body and the end cap is fixedly connected to the surface of the convex portion. The one-way flow channel is a communication port opened on the inner bottom wall of the cylindrical body, and a first one-way valve is fixedly connected to the inner wall of the communication port. A plurality of oil replenishing holes are opened on the upper surface of the end cap on the outer ring of the convex portion. A second electric push rod is fixedly connected to the bottom of the interior of the lower specimen. The output end of the second electric push rod penetrates the cylindrical body and is fixedly connected to the bottom of the convex portion. The telescopic shaft of the second electric push rod is slidably connected to the cylindrical body.

[0010] Further, an oil storage cavity is formed within the lower specimen. The oil storage cavity is located below the oil pits, and a communication port penetrating the oil pits is opened on the inner top wall of the oil storage cavity. A second one-way valve is fixedly connected to the inner wall of the communication port. A sealing sleeve is fixedly connected between the inner bottom wall and the inner top wall of the oil storage cavity. The telescopic shaft of the second electric push rod penetrates the sealing shaft sleeve. The first electric push rod is arranged between the oil pits and the oil storage cavity. The output end of the first electric push rod penetrates the inner bottom wall of the oil pits and is fixedly connected to the bottom of the cylindrical body.

[0011] Further, it further includes a damping shock isolation platform. A support platform is fixedly connected to the upper surface of the damping shock isolation platform. The lower specimen is fixedly connected to the upper surface of the support platform. An installation cover is fixedly connected to the bottom of the support platform. An electromagnetic coil is fixedly connected to the upper surface of the installation cover. A through port corresponding to the lower specimen and the electromagnetic coil is opened on the upper surface of the support platform.

[0012] Furthermore, an extension wall is formed on the surface of the lower specimen. An oil sump is formed between the extension wall and the lower specimen. A recovery nozzle communicating with the oil sump is fixedly connected to the surface of the extension wall. An oil inlet nozzle communicating with the oil storage cavity is fixedly connected to the surface of the lower specimen. An oil waste filtering and recovery device is fixedly connected to the upper surface of the damping and vibration isolation platform. The oil inlet end of the oil waste filtering and recovery device is fixedly connected to a recovery pipe. One end of the recovery pipe is fixedly connected to the recovery nozzle. The oil outlet end of the oil waste filtering and recovery device is fixedly connected to an oil inlet pipe. The oil inlet pipe is fixedly connected to the oil inlet nozzle. A computer and a control box are fixedly connected to the upper surface of the damping and vibration isolation platform.

[0013] Furthermore, an electric slide is fixedly connected to the upper surface of the damping and vibration isolation platform. A support frame is fixedly connected to the moving end of the electric slide. An upper adapter plate is fixedly connected to the bottom of the support frame. A three-dimensional force sensor is arranged at the bottom of the upper adapter plate. A lower adapter plate is arranged at the bottom of the three-dimensional force sensor. A driving motor is fixedly connected to the bottom of the lower adapter plate. A harmonic reducer is fixedly connected to the bottom of the driving motor. The output end of the harmonic reducer drives the upper specimen to rotate.

[0014] Furthermore, a reverse-mounted slip ring is arranged at the top of the upper specimen. The rotor of the reverse-mounted slip ring is fixedly connected to the top of the upper specimen. The stator of the reverse-mounted slip ring is fixedly connected to the bottom of the harmonic reducer. A transmission shaft is fixedly connected to the output end of the harmonic reducer. The bottom end of the transmission shaft penetrates through the stator of the reverse-mounted slip ring and is fixedly connected to the top of the upper specimen.

[0015] Furthermore, an installation groove is formed at the top of the upper specimen, and an eddy current sensor is fixedly connected in the installation groove. A cable is fixedly connected to the surface of the rotor of the reverse-mounted slip ring, and the other end of the cable is connected to the eddy current sensor.

[0016] Furthermore, a wire interface is arranged at the top of the eddy current sensor. One end of the cable is connected to the wire interface, and the probe at the bottom of the eddy current sensor extends to the bottom of the upper specimen.

[0017] Beneficial effects:

[0018] 1. In the present invention, by injecting lubricating oil into the lubrication area, when the upper specimen rotates, the lubricating oil in the lubrication area will form an oil film on the friction surface of the lower specimen under the action of centrifugal force and surface tension to achieve lubrication. By driving the adjusting member to move up and down in the oil pit through the output end of the first electric push rod, the depth of the lubrication area can be adjusted in real time according to different working condition parameters such as load and rotational speed, so as to optimize the oil film thickness distribution and ensure the best lubrication effect under various working conditions. This dynamic adjustment mechanism effectively solves the technical problem that the traditional oil pit with a fixed depth cannot adapt to the change of working conditions.

[0019] 2. In the present invention, the output end of the first electric push rod drives the adjusting member to move downward, and the adjusting member compresses the space in the transition zone, increasing the internal pressure thereof, so that the lubricating oil in the transition zone flows along the one-way channel to the lubricating zone, realizing automatic replenishment of the lubricating oil. The specially designed cylinder structure can temporarily store the excess lubricating oil when the adjusting member moves downward, which not only avoids the waste caused by excessive oil volume in the lubricating zone, but also provides a buffer space for subsequent replenishment of the lubricating oil. This design significantly improves the reliability and economy of the lubrication system, and solves the technical problems of untimely oil replenishment and waste of lubricating oil in the traditional lubrication device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structure schematic diagram of the present invention;

[0021] Figure 2 is a three-dimensional structure schematic diagram of the waste oil filtration and recovery device of the present invention;

[0022] Figure 3 is a three-dimensional structure schematic diagram of the electric slide table of the present invention;

[0023] Figure 4 is a sectional structure schematic diagram of the support frame of the present invention;

[0024] Figure 5 is a semi-sectional structure schematic diagram of the upper specimen of the present invention;

[0025] Figure 6 is a front sectional structure schematic diagram of the eddy current sensor of the present invention;

[0026] Figure 7 is a side sectional structure schematic diagram of the support platform of the present invention;

[0027] Figure 8 is a side sectional structure schematic diagram of the lower specimen of the present invention;

[0028] Figure 9 is a sectional structure schematic diagram of the lower specimen of the present invention;

[0029] Figure 10 of the present invention Figure 9 is an enlarged structure schematic diagram at A;

[0030] Figure 11 is a sectional structure schematic diagram of the lower specimen and the adjusting member of the present invention;

[0031] Figure 12 of the present invention Figure 11 is an enlarged structure schematic diagram at B.

[0032] The reference numerals are as follows:

[0033] 1. Lower specimen; 2. Upper specimen; 3. Oil pit; 4. Adjusting member; 401. Cylinder body; 402. End cover; 403. Protrusion; 404. Sealing ring; 405. Oil replenishing hole; 5. Lubrication area; 6. Transition area; 7. First electric push rod; 8. First one-way valve; 9. Second electric push rod; 10. Oil storage cavity; 11. Second one-way valve; 12. Sealing shaft sleeve; 13. Damping isolation platform; 14. Support platform; 15. Installation cover; 16. Electromagnetic coil; 17. Extension wall; 18. Waste oil tank; 19. Recovery nozzle; 20. Oil inlet nozzle; 21. Waste oil filtration and recovery device; 22. Recovery pipe; 23. Oil inlet pipe; 24. Computer; 25. Control box; 26. Electric slide table; 27. Support frame; 28. Upper adapter plate; 29. Three-dimensional force sensor; 30. Lower adapter plate; 31. Driving motor; 32. Harmonic reducer; 33. Reverse-mounted slip ring; 34. Transmission shaft; 35. Eddy current sensor; 36. Cable; 37. Wire interface; 38. Probe. Detailed implementation manners

[0034] The following further describes the present invention in conjunction with the Figures 1-12 accompanying drawings and embodiments:

[0035] As Figures 1-12 shown, an intelligent lubrication system based on dynamic adjustment of the depth of a textured oil pit includes a lower specimen 1 and an upper specimen 2 that can rotate within the lower specimen 1 to form a friction pair. A plurality of oil pits 3 are formed on the top friction surface of the lower specimen 1. An adjusting member 4 is slidably arranged along the axial direction within the oil pit 3. The adjusting member 4 divides the oil pit 3 into an upper lubrication area 5 and a lower transition area 6. A first electric push rod 7 for driving the adjusting member 4 to move up and down is arranged within the lower specimen 1 to change the depth of the lubrication area 5. A one-way flow channel is arranged within the adjusting member 4. When the adjusting member 4 moves downward, the space of the transition area 6 is compressed, causing the internal lubricating oil to flow in a one-way manner along the flow channel to the lubrication area 5.

[0036] Specifically, by injecting lubricating oil into the lubrication area 5, when the upper specimen 2 rotates, the lubricating oil within the lubrication area 5 will form an oil film on the friction surface of the lower specimen 1 under the action of centrifugal force and surface tension to achieve lubrication. By driving the adjusting member 4 to move up and down within the oil pit 3 through the output end of the first electric push rod 7, the depth of the lubrication area 5 can be adjusted according to different working conditions, and thus the height of the oil surface can be adjusted to ensure the lubrication effect. By driving the adjusting member 4 to move downward through the output end of the first electric push rod 7, the space of the transition area 6 is compressed, increasing its internal pressure, causing the lubricating oil within the transition area 6 to flow along the one-way channel to the lubrication area 5, realizing automatic replenishment of the lubricating oil.

[0037] The adjusting member 4 includes a cylindrical body 401 with an upward opening. A end cover 402 is provided at the top of the cylindrical body 401. A convex portion 403 is integrally formed at the bottom of the end cover 402. A sealing ring 404 for sealing the connection between the cylindrical body 401 and the end cover 402 is fixedly connected to the surface of the convex portion 403. The one-way flow channel is a communication port opened on the inner bottom wall of the cylindrical body 401, and a first one-way valve 8 is fixedly connected to the inner wall of the communication port. A plurality of oil replenishing holes 405 are opened on the upper surface of the end cover 402 on the outer ring of the convex portion 403. A second electric push rod 9 is fixedly connected to the bottom inside the lower specimen 1. The output end of the second electric push rod 9 penetrates through the cylindrical body 401 and is fixedly connected to the bottom of the convex portion 403. The telescopic shaft of the second electric push rod 9 is slidably connected to the cylindrical body 401.

[0038] Specifically, by providing the cylindrical body 401 for containing lubricating oil, when only the height of the adjusting member 4 needs to be lowered, the lubricating oil in the transition zone 6 enters the cylindrical body 401 for temporary accommodation, avoiding waste caused by excessive lubricating oil in the lubricating zone 5 when the height of the adjusting member 4 is reduced. Among them, when there is a certain amount of lubricating oil in the lubricating zone 5, as the upper specimen 2 rotates and rubs against the lower specimen 1, the lubricating oil in the lubricating zone 5 will form an oil film on the friction surface of the lower specimen 1 under the action of centrifugal force and surface tension, reducing friction. At the same time, the amount of oil in the lubricating zone 5 decreases. At this time, the output ends of the first electric push rod 7 and the second electric push rod 9 extend synchronously, driving the cylindrical body 401 and the end cover 402 to move upward synchronously, reducing the depth of the lubricating zone 5 and ensuring that the oil level height remains unchanged. When lubricating oil needs to be replenished, the output ends of the first electric push rod 7 and the second electric push rod 9 contract synchronously, driving the adjusting member 4 to move downward, compressing the space of the transition zone 6, so that the lubricating oil in the transition zone 6 enters the inside of the cylindrical body 401 through the first one-way valve 8, increasing the internal oil pressure. Then, the output end of the second electric push rod 9 drives the end cover 402 to move upward, so that the sealing ring no longer seals the connection between the cylindrical body 401 and the end cover 402. The high-pressure oil in the cylindrical body 401 enters the lubricating zone 5 above the end cover 402 through the oil replenishing holes 405. Then, the output end of the first electric push rod 7 drives the cylindrical body 401 to move upward, so that the cylindrical body 401 and the end cover 402 are closed. Then, the first electric push rod 7 and the second electric push rod 9 move synchronously to adjust the depth of the lubricating zone 5, and the height of the oil level can be adjusted.

[0039] An oil storage cavity 10 is formed inside the lower specimen 1. The oil storage cavity 10 is located below the oil pit 3, and a communication port penetrating through the oil pit 3 is opened on the inner top wall of the oil storage cavity 10. A second one-way valve 11 is fixedly connected to the inner wall of the communication port. A sealing sleeve is fixedly connected between the inner bottom wall and the inner top wall of the oil storage cavity 10. The telescopic shaft of the second electric push rod 9 penetrates through the sealing shaft sleeve 12. The first electric push rod 7 is arranged between the oil pit 3 and the oil storage cavity 10. The output end of the first electric push rod 7 penetrates through the inner bottom wall of the oil pit 3 and is fixedly connected to the bottom of the cylindrical body 401.

[0040] Specifically, by setting up the oil storage cavity 10 for storing lubricating oil and maintaining a high-pressure state in the oil storage cavity 10, the lubricating oil in the oil storage cavity 10 can timely enter the transition zone 6 through the second one-way valve 11 for replenishment. Among them, the lower specimen 1 is assembled by two upper and lower parts to facilitate the installation of the first electric push rod 7.

[0041] It further includes a damping and vibration isolation platform 13. The upper surface of the damping and vibration isolation platform 13 is fixedly connected with a support platform 14. The lower specimen 1 is fixedly connected to the upper surface of the support platform 14. The bottom of the support platform 14 is fixedly connected with an installation cover 15. The upper surface of the installation cover 15 is fixedly connected with an electromagnetic coil 16. The upper surface of the support platform 14 is provided with through holes corresponding to the lower specimen 1 and the electromagnetic coil 16.

[0042] Specifically, when the electromagnetic coil 16 passing through high-frequency alternating current approaches the upper specimen 2, eddy currents will be induced on the surface. The reverse magnetic field generated by the eddy currents will change the impedance of the electromagnetic coil 16. By measuring the change in the impedance of the electromagnetic coil 16, the distance from the bottom of the upper specimen 2 can be deduced, so as to indirectly obtain the oil film thickness, so as to measure the oil film thickness by the eddy current method.

[0043] An extension wall 17 is formed on the surface of the lower specimen 1. An oil waste tank 18 is formed between the extension wall 17 and the lower specimen 1. A recovery nozzle 19 communicating with the oil waste tank 18 is fixedly connected to the surface of the extension wall 17. An oil inlet nozzle 20 communicating with the oil storage cavity 10 is fixedly connected to the surface of the lower specimen 1. An oil waste filtering and recovery device 21 is fixedly connected to the upper surface of the damping and vibration isolation platform 13. The oil inlet end of the oil waste filtering and recovery device 21 is fixedly connected with a recovery pipe 22. One end of the recovery pipe 22 is fixedly connected with the recovery nozzle 19. The oil outlet end of the oil waste filtering and recovery device 21 is fixedly connected with an oil inlet pipe 23. The oil inlet pipe 23 is fixedly connected with the oil inlet nozzle 20. A computer 24 and a control box 25 are fixedly connected to the upper surface of the damping and vibration isolation platform 13.

[0044] Specifically, by setting up the oil waste tank 18, the oil liquid overflowing from the edge between the upper specimen 2 and the lower specimen 1 during friction can be concentrated. These oil liquids are recovered to the oil waste filtering and recovery device 21 through the recovery pipe 22. The oil waste filtering and recovery device 21 stores the overflowing oil liquids after filtering and recovery, and then sends them into the oil storage cavity 10 through the oil pump of the oil waste filtering and recovery device 21 using the oil inlet pipe 23 to ensure the high-pressure state in the oil storage cavity 10.

[0045] The upper surface of the damping isolation platform 13 is fixedly connected with an electric slide table 26. The moving end of the electric slide table 26 is fixedly connected with a support frame 27. The bottom of the support frame 27 is fixedly connected with an upper adapter plate 28. A three-dimensional force sensor 29 is arranged at the bottom of the upper adapter plate 28. A lower adapter plate 30 is arranged at the bottom of the three-dimensional force sensor 29. The bottom of the lower adapter plate 30 is fixedly connected with a driving motor 31. The bottom of the driving motor 31 is fixedly connected with a harmonic reducer 32. The output end of the driving motor 31 is connected with the input end of the harmonic reducer 32. The output end of the harmonic reducer 32 drives the upper specimen 2 to rotate.

[0046] A reverse-mounted slip ring 33 is arranged at the top of the upper specimen 2. The rotor of the reverse-mounted slip ring 33 is fixedly connected with the top of the upper specimen 2. The stator of the reverse-mounted slip ring 33 is fixedly connected with the bottom of the harmonic reducer 32. The output end of the harmonic reducer 32 is fixedly connected with a transmission shaft 34. The bottom end of the transmission shaft 34 penetrates through the stator of the reverse-mounted slip ring 33 and is fixedly connected with the top of the upper specimen 2.

[0047] An installation groove is formed at the top of the upper specimen 2, and an eddy current sensor 35 is fixedly connected in the installation groove. A cable 36 is fixedly connected to the surface of the rotor of the reverse-mounted slip ring 33. The other end of the cable 36 is connected with the eddy current sensor 35.

[0048] A wire interface 37 is arranged at the top of the eddy current sensor 35. One end of the cable 36 is connected with the wire interface 37. The probe 38 at the bottom of the eddy current sensor 35 extends to the bottom of the upper specimen 2.

[0049] Specifically, the height of the upper specimen 2 is adjusted by the electric slide table 26. The normal load is monitored in real time by the three-dimensional force sensor. The analog signal collected is converted into a digital signal by a data acquisition card. The computer 24 compares the collected normal load with the set normal load. According to the difference between the two, the driving motor 31 is feedback-adjusted to ensure that the normal load of the upper specimen 2 is consistent with the set value. The driving motor 31 and the harmonic reducer 32 drive the transmission shaft 34 to rotate, and then drive the upper specimen 2 to rotate, so as to generate friction between the upper specimen 2 and the lower specimen 1. The eddy current sensor 35 is connected through the slip ring to avoid winding of the cable 36 during rotation.

[0050] In this embodiment, the eddy current method is used to measure the oil film thickness. When the electromagnetic coil 16 with high-frequency alternating current is close to the upper specimen, eddy currents will be induced on the surface. The reverse magnetic field generated by the eddy currents will change the impedance of the electromagnetic coil 16. By measuring the change in the impedance of the electromagnetic coil 16, the distance from the lower surface of the upper specimen 2 can be deduced, and thus the oil film thickness can be indirectly obtained. A theoretical model is established through mathematical modeling. The complex impedance Z of the coil is expressed as:

[0051] Z = R s + JωL s

[0052] where R s is the equivalent resistance (Ω) of the electromagnetic coil; L s is the equivalent inductance (H) of the electromagnetic coil; ω is the angular frequency (rad / s) of the excitation signal, ω = 2πf, and f is the frequency (Hz).

[0053] When the electromagnetic coil 16 approaches the conductive plane, the relationship between the impedance change ΔZ and the oil film thickness h is:

[0054]

[0055] where Z0 is the initial impedance without a conductor; K is the sensitivity coefficient of the eddy current sensor; d is the distance between the electromagnetic coil and the upper friction pair.

[0056] Finally, the relationship between the oil film thickness h and the distance D between the electromagnetic coil and the conductor is:

[0057] h = D - D ref

[0058] where d ref is the reference distance (obtained through initial calibration) between the electromagnetic coil and the upper specimen without an oil film.

[0059] The eddy current sensor real-time detects the oil film thickness h between the upper specimen 2 and the lower specimen 1 sensor , when the eddy current sensor detects the oil film thickness h in a certain area sensor <h target , calculate the error E = h target -h sensor , judge the error change rate According to the second electric push rod 9, perform fuzzy control on the oil film thickness error E and establish a fuzzy set {NB (Negative Big), NS (Negative Small), ZO (Zero)}; define the error change rate ΔE as the input variable and establish a fuzzy set {FD (Fast Thinning), SD (Slow Thinning), ST (Stable)}, and define the voltage increment (corresponding to the displacement of the telescopic structure) (U) of the second electric push rod 9 as the output variable and establish a fuzzy set {LE (Large Advance), SE (Small Advance), HOLD (Maintain)}.

[0060] Establish a fuzzy rule base, including three rules: maximum oil replenishment, medium oil replenishment, and maintaining the status quo.

[0061]

[0062] Use the centroid method as the defuzzification method to calculate the accurate output value.

[0063]

[0064] where μi is the activation degree of the i-th rule; V i is the central value of the corresponding output membership function (e.g., LE corresponds to +20V). The nonlinear compensation of displacement-voltage is carried out by establishing the Preisach model of the piezoelectric actuator

[0065] ΔL = α·V + β·∫|dV / dt|dt - γ·H(V hist )

[0066] where α is the static sensitivity; β is the speed-related term; H(V hish ) is the hysteresis memory term, calibrated through experiments; γ is the hysteresis weight coefficient

[0067] is the hysteresis memory term, calibrated through experiments; γ is the hysteresis weight coefficient.

[0068] Generate the inverse model feedforward signal by online identifying the hysteresis characteristics.

[0069]

[0070] where sat(x) = sign(x)·min(|x|, 20) is the voltage saturation function to suppress overcompensation; w k is the weight coefficient, fitted from historical data.

[0071] Establish the relationship between the oil flow rate and the displacement of the second electric push rod 9, model the oil replenishment amount in the lubrication area 5, and realize the fuzzy control of the second electric push rod 9. When the oil film at one place becomes thinner, the signal is amplified, filtered and digitized, and then input into the computer 24. The control algorithm judges whether the oil film thickness is lower than the threshold, controls the second electric push rod 9 at the corresponding lubrication area 5 to start, and replenishes the oil film at that place; when the eddy current sensor 35 detects that the oil film has returned to the standard thickness, the signal is continuously fed back to the computer 24, and the computer 24 controls the second electric push rod 9 to stop, so as to ensure that the oil film thickness between the upper specimen 2 and the lower specimen 1 remains at the established thickness.

[0072] Working principle: When the intelligent lubrication system with dynamically adjustable depth of the textured oil pit is in use, the user first checks whether the waste oil filtration and recovery device 21, the inlet pipe 23, and the return pipe are properly connected. Then, start the oil pump of the waste oil filtration and recovery device 21 to fill the oil storage chamber 10 with lubricating oil and maintain high pressure. Set the normal load value of the electric slide table 26 through the computer 24, set the rotation speed and rotation time of the drive motor 31, control the friction speed and duration, and then start the electric slide table 26. The moving end of the electric slide table 26 drives the support frame 27 to descend, and the moving frame drives the upper specimen 2 to move downward until it contacts the lower specimen 1. Then, start the drive motor 31 and the harmonic reducer 32 to drive the upper specimen 2 to rotate at the set speed, so that friction is generated between the upper specimen 2 and the lower specimen 1. During this process, the oil film thickness is measured by the eddy current method. When lubricating oil needs to be replenished, the output ends of the first electric push rod 7 and the second electric push rod 9 contract synchronously, driving the adjusting member 4 to move downward, compressing the space of the transition zone 6, so that the lubricating oil in the transition zone 6 enters the interior of the cylinder body 401 through the first one-way valve 8, increasing the oil pressure inside it. Then, the output end of the second electric push rod 9 drives the end cover 402 to move upward, so that the sealing ring no longer seals the connection between the cylinder body 401 and the end cover 402. The high-pressure oil in the cylinder body 401 enters the lubrication zone 5 above the end cover 402 through the oil replenishing hole 405. Then, the output end of the first electric push rod 7 drives the cylinder body 401 to move upward, so that the cylinder body 401 and the end cover 402 are closed. Then, the first electric push rod 7 and the second electric push rod 9 move synchronously to adjust the depth of the lubrication zone 5, and thus the height of the oil level can be adjusted. The output end of the first electric push rod 7 drives the adjusting member 4 to move up and down in the oil pit 3, and the depth of the lubrication zone 5 can be adjusted according to different working conditions, and further the height of the oil level can be adjusted to ensure the lubrication effect.

[0073] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. An intelligent lubrication system based on dynamic adjustment of the depth of textured oil pits, comprising a lower specimen (1) and an upper specimen (2) that can rotate within the lower specimen (1) to form a friction pair. A plurality of oil pits (3) are formed on the top friction surface of the lower specimen (1), and it is characterized in that, An adjusting member (4) is slidably arranged along the axial direction inside the oil pit (3). The adjusting member (4) divides the oil pit (3) into an upper lubricating area (5) and a lower transition area (6). A first electric push rod (7) for driving the adjusting member (4) to move up and down is arranged inside the lower specimen (1) to change the depth of the lubricating area (5). A one-way flow channel is arranged inside the adjusting member (4). When the adjusting member (4) moves downwards, it compresses the space of the transition area (6) to form a directional flow of the internal lubricating oil along the one-way flow channel to the lubricating area (5).

2. The intelligent lubrication system based on dynamic adjustment of the depth of the textured oil pit according to claim 1, characterized in that: The adjusting member (4) includes a cylindrical body (401) with an upward opening. A end cover (402) is arranged at the top of the cylindrical body (401). A convex portion (403) is integrally formed at the bottom of the end cover (402). A sealing ring (404) for sealing the connection between the cylindrical body (401) and the end cover (402) is fixedly connected to the surface of the convex portion (403). The one-way flow channel is a communication port opened on the inner bottom wall of the cylindrical body (401), and a first one-way valve (8) is fixedly connected to the inner wall of the communication port. A plurality of oil replenishing holes (405) are opened on the upper surface of the end cover (402) outside the ring of the convex portion (403). A second electric push rod (9) is fixedly connected to the bottom inside the lower specimen (1). The output end of the second electric push rod (9) penetrates through the cylindrical body (401) and is fixedly connected to the bottom of the convex portion (403). The telescopic shaft of the second electric push rod (9) is slidably connected to the cylindrical body (401).

3. The intelligent lubrication system based on dynamic adjustment of the depth of the textured oil sump according to claim 2, characterized in that: An oil storage cavity (10) is formed inside the lower specimen (1). The oil storage cavity (10) is located below the oil pit (3). A communication port penetrating through the oil pit (3) is opened on the inner top wall of the oil storage cavity (10). A second one-way valve (11) is fixedly connected to the inner wall of the communication port. A sealing sleeve (12) is fixedly connected between the inner bottom wall and the inner top wall of the oil storage cavity (10). The telescopic shaft of the second electric push rod (9) penetrates through the sealing sleeve (12). The first electric push rod (7) is arranged between the oil pit (3) and the oil storage cavity (10). The output end of the first electric push rod (7) penetrates through the inner bottom wall of the oil pit (3) and is fixedly connected to the bottom of the cylindrical body (401).

4. The intelligent lubrication system based on dynamic adjustment of the depth of the textured oil sump according to claim 3, wherein: It further includes a damping and shock isolation platform (13). A support platform (14) is fixedly connected to the upper surface of the damping and shock isolation platform (13). The lower specimen (1) is fixedly connected to the upper surface of the support platform (14). An installation cover (15) is fixedly connected to the bottom of the support platform (14). An electromagnetic coil (16) is fixedly connected to the upper surface of the installation cover (15). Through holes corresponding to the lower specimen (1) and the electromagnetic coil (16) are opened on the upper surface of the support platform (14).

5. A method for using an intelligent lubrication system with dynamically adjustable depth of a textured oil sump as described in any one of claims 1-4, characterized in that, The steps are as follows: First, the user checks whether the waste oil filtration and recovery device (21), the inlet oil pipe (23), and the return oil pipe are connected properly. Then, start the oil pump of the waste oil filtration and recovery device (21) to fill the oil storage cavity (10) with lubricating oil and maintain high pressure. Set the normal load value of the electric slide table (26) through the computer (24), set the rotation speed and rotation time of the driving motor (31), control the friction speed and duration, and then start the electric slide table (26). The moving end of the electric slide table (26) drives the support frame (27) to descend, and the moving frame drives the upper specimen (2) to move downward until it contacts the lower specimen (1). Then, start the driving motor (31) and the harmonic reducer (32) to drive the upper specimen (2) to rotate at the set speed, so that friction is generated between the upper specimen (2) and the lower specimen (1). During this process, the oil film thickness is measured by the eddy current method.

6. The usage method according to claim 5, wherein, When lubricating oil needs to be replenished, the output ends of the first electric push rod (7) and the second electric push rod (9) contract synchronously, driving the adjusting member (4) to move downward, compressing the space in the transition zone (6), so that the lubricating oil in the transition zone (6) enters the inside of the cylinder body (401) through the first one-way valve (8), increasing the oil pressure inside it. Then, the output end of the second electric push rod (9) drives the end cover (402) to move upward, so that the sealing ring no longer seals the connection between the cylinder body (401) and the end cover (402). The high-pressure oil in the cylinder body (401) enters the lubrication zone (5) above the end cover (402) through the oil replenishing hole (405). Then, the output end of the first electric push rod (7) drives the cylinder body (401) to move upward, so that the cylinder body (401) and the end cover (402) are closed. Then, the first electric push rod (7) and the second electric push rod (9) move synchronously to adjust the depth of the lubrication zone (5), and thus the height of the oil level can be adjusted. The output end of the first electric push rod (7) drives the adjusting member (4) to move up and down in the oil pit (3), and the depth of the lubrication zone (5) can be adjusted according to different working conditions, and further the height of the oil level can be adjusted to ensure the lubrication effect.

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