System for testing electrostatic accumulation and dissipation of oil lubrication interface in friction process

Abstract

A system for testing static accumulation and dissipation of an oil lubrication interface in a friction process relates to the technical field of static testing of lubrication interfaces, and comprises a friction pair, a non-contact static potential measuring instrument, a data acquisition instrument, a controller and a display, a lubricating oil interface is arranged on the contact face of the upper friction body and the lower friction body, a probe of a non-contact electrostatic potential measuring instrument is arranged above the lubricating oil interface, the non-contact electrostatic potential measuring instrument is in signal connection with a data acquisition instrument through a wire, and the data acquisition instrument is electrically connected with a controller through a wire. And the controller is electrically connected with the power supply and the display through wires respectively. Potential measurement is realized in a non-contact manner, and direct contact between a detection instrument and a lubricating oil interface of a measured object is avoided, so that the influence of contact interference on a measurement result is reduced.

Description

Technical Field

[0001] This invention relates to the field of electrostatic testing technology for lubrication interfaces, specifically to a system for testing the accumulation and dissipation of static electricity at the oil lubrication interface during friction. Background Technology

[0002] Friction is always accompanied by the generation of triboelectricity, especially at oil-lubricated interfaces where static electricity can easily accumulate and dissipate. However, when the interface is in an oil-lubricated state, the complexity of triboelectric behavior increases significantly, and the accumulation of triboelectric static electricity can lead to lubricant aging, increased friction, and even equipment failure. Meanwhile, changes in triboelectric signals can serve as indicators of equipment status and lubrication performance, providing new methods for online monitoring and fault diagnosis. Therefore, developing a system capable of in-situ, real-time monitoring of the electrostatic behavior at oil-lubricated interfaces during friction is particularly important.

[0003] Currently, the mainstream methods for testing triboelectricity include ammeters, voltmeters, and resistance meters. However, when the charge dissipation rate at the triboelectric interface is extremely low, these methods struggle to detect a valid electrical signal. Oscilloscopes primarily display voltage values, and voltage testing is only available in some high-end oscilloscopes (such as Tektronix oscilloscopes). Even then, it requires a series of complex accessories and conversion methods, resulting in higher costs. Furthermore, the electrical signal can be interfered with during measurement by contact between these instruments (e.g., mechanical vibration, pressure effects), potentially affecting the stability of the system under test. Utility Model Content

[0004] This invention discloses a system for testing the accumulation and dissipation of static electricity at the oil-lubricated interface during friction. The purpose is to provide a non-contact system for testing the accumulation and dissipation of static electricity at the oil-lubricated interface during friction, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution of this invention is as follows:

[0006] A system for testing the accumulation and dissipation of static electricity at an oil-lubricated interface during friction includes a friction pair, a non-contact electrostatic potential meter, a data acquisition unit, a controller, and a display. The friction pair includes an upper friction body and a lower friction body. A lubricating oil interface is provided on the contact surface of the upper and lower friction bodies. A probe of the non-contact electrostatic potential meter is provided above the lubricating oil interface. The non-contact electrostatic potential meter is connected to the data acquisition unit via a wire. The data acquisition unit is electrically connected to the controller via a wire. The controller is electrically connected to a power supply and the display via wires.

[0007] Preferably, the friction pair is connected to a friction testing machine.

[0008] Preferably, the friction pair is the friction pair used in actual working conditions.

[0009] Preferably, it also includes a worktable, the bottom end of the lower friction body is rotatably connected to the worktable, and the top end of the worktable is provided with a first driving mechanism for driving the lower friction body to rotate.

[0010] Preferably, the first driving mechanism includes a drive gear, a servo motor is provided at the top of the worktable, the output shaft of the servo motor extends longitudinally upward and is fixedly connected to the central shaft hole of the drive gear, a rotating shaft is provided on one side of the servo motor, the bottom end of the rotating shaft is rotatably connected to the worktable through a bearing, and a driven gear is fixedly connected to the top end of the driven gear, the top end of the driven gear is provided with a slot structure, the bottom end of the lower friction body is engaged in the slot, and the drive gear and the driven gear are meshed together.

[0011] Preferably, a support plate is provided on one side of the top of the workbench. The support plate is arranged longitudinally, and a guide sleeve is passed through the upper end of the support plate in the transverse direction. A guide rod is passed through and slidably connected inside the guide sleeve. One end of the guide rod is fixedly connected to the top of the upper friction body. The upper friction body moves back and forth together with the guide rod through a second driving mechanism.

[0012] Preferably, the second driving mechanism includes an electric cylinder arranged laterally above the guide rod. The fixed end of the electric cylinder is fixedly connected to the outer surface of the support plate, and the telescopic end is fixedly connected to a connecting plate. The connecting plate is fixedly connected to the top end of the guide rod. When the electric cylinder extends or retracts, the guide rod slides along the guide sleeve. When the electric cylinder is locked, the upper friction body is fixed at a set position at the top end of the lower friction body.

[0013] Preferably, the probe is vertically positioned on the side of the upper friction body away from the electric cylinder, and a connecting rod is horizontally connected between the probe and the connecting plate. One end of the connecting rod is fixedly connected to the top of the connecting plate by a screw, and the other end is fixedly connected to the probe.

[0014] Preferably, the controller is electrically connected to a human-machine interface device, and the human-machine interface device is equipped with a servo motor control button and an electric cylinder control button.

[0015] The beneficial effects of this novel system for testing the accumulation and dissipation of static electricity at the oil-lubricated interface during friction are as follows:

[0016] 1. This novel invention can monitor the triboelectric signal generated by a friction pair during frictional motion and determine the relative motion state of the upper and lower friction bodies based on the monitored triboelectric signal. Specifically, when the friction pair is in normal frictional state, the generated potential signal is stable; when friction stops, the generated triboelectric potential signal dissipates. Because this invention uses a non-contact method for potential measurement, it avoids direct contact between the probe and the lubricating oil interface of the object being measured, thereby reducing the impact of contact interference on the measurement results.

[0017] 2. The method provided by this invention can realize real-time and dynamic monitoring of friction pairs, with sensitive response. It can monitor without opening or damaging the friction pairs, and the measuring device is easy to install. The method provided by this invention is applicable to friction pairs under various lubrication conditions. The contact methods include point contact, line contact and surface contact, and the motion forms include linear motion, linear reciprocating motion and rotary motion.

[0018] 3. This new invention can be applied to actual working condition monitoring, electrostatic monitoring of the lubricating oil interface of friction pairs connected to a friction testing machine, and electrostatic monitoring of the lubricating oil interface in various motion forms of friction pairs in the laboratory, thereby achieving a variety of application effects. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this invention, the accompanying drawings used in the embodiments are briefly described below, which constitute a part of the specification and are used together with the embodiments of this invention to explain this invention, but do not constitute a limitation on this invention.

[0020] Figure 1 A schematic diagram of the overall structure of this novel invention;

[0021] Figure 2 A top view of the novel driven gear;

[0022] Figure 3 A cross-sectional view of the novel friction body and the slot structure.

[0023] 1. Workbench; 2. Support plate; 3. Guide sleeve; 4. Guide rod; 5. Electric cylinder; 6. Connecting plate; 7. Connecting rod; 8. Screw; 9. Probe; 10. Non-contact electrostatic potential meter; 11. Data acquisition instrument; 12. Controller; 13. Display; 14. Servo motor; 15. Drive gear; 16. Bearing; 17. Driven gear; 171. Slot structure; 172. Elastomer; 18. Lower friction body; 19. Upper friction body; 20. Lubricating oil interface. Detailed Implementation

[0024] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0025] The following embodiments can be understood as explaining a partial structure of the present invention individually, or as explaining a larger structure of the present invention through a combination of multiple embodiments.

[0026] Example 1

[0027] A system for testing the accumulation and dissipation of static electricity at the oil-lubricated interface during friction, such as Figure 1 As shown, the system includes a friction pair, a non-contact electrostatic potential measuring instrument 10, a data acquisition instrument 11, a controller 12, and a display 13. The friction pair includes an upper friction body 19 and a lower friction body 18. A lubricating oil interface 20 is provided on the contact surface of the upper friction body 19 and the lower friction body 18. A probe 9 of the non-contact electrostatic potential measuring instrument is provided above the lubricating oil interface 20. The non-contact electrostatic potential measuring instrument 10 is connected to the data acquisition instrument 11 via a wire. The data acquisition instrument 11 is electrically connected to the controller 12 via a wire. The controller 12 is electrically connected to the power supply and the display 13 via wires.

[0028] In this embodiment, the electrostatic potential change of the lubricating oil interface can be monitored in real time in a non-contact state using a non-contact electrostatic potential meter, thereby monitoring the working state of the friction pair and the state of the lubricating oil interface (the aging of lubricating oil will bring about changes in electrical signals).

[0029] Example 2

[0030] Based on Example 1, this example discloses that the friction pair is connected to a friction testing machine, so that both the potential change at the lubricating oil interface and the coefficient of friction can be measured.

[0031] Example 3

[0032] Based on Example 1, this embodiment discloses that the friction pair is a friction pair used in actual working conditions, that is, by monitoring the electrostatic data of the lubricating oil interface of the friction pair in actual working conditions using this novel method.

[0033] Example 4

[0034] Based on Example 1, this embodiment also discloses a test device for electrostatic monitoring of the lubricating oil interface of a friction pair, specifically as follows: Figure 1As shown, it also includes a worktable 1, the bottom end of the lower friction body 18 is rotatably connected to the worktable 1, and the top of the worktable 1 is provided with a first driving mechanism for driving the lower friction body 18 to rotate.

[0035] like Figure 1-3 As shown, the first driving mechanism includes a drive gear 15, a servo motor 14 is provided at the top of the worktable 1, the output shaft of the servo motor 14 extends longitudinally upward and is fixedly connected to the central shaft hole of the drive gear 15, a rotating shaft (not marked in the figure) is provided on one side of the servo motor 14, the bottom end of the rotating shaft is rotatably connected to the worktable 1 through a bearing 16, and a driven gear 17 is fixedly connected to the top end, the driven gear 17 has a slot structure 171 at the top end, the bottom end of the lower friction body 18 is engaged in the slot 171, and the drive gear 15 and the driven gear 17 are meshed together. Figure 2 , 3 As shown, an elastic body 172 can be provided on the inner wall of the slot, so that the lower friction body 18 can be connected by plugging and unplugging. Of course, other forms of snap-fit ​​can also be used to restrict the relative rotation of the lower friction body and the driven gear.

[0036] like Figure 1-3 As shown, a support plate 2 is provided on one side of the top of the workbench 1. The support plate 2 is arranged longitudinally, and a guide sleeve 3 is passed through the upper end of the support plate 2 in the transverse direction. A guide rod 4 is passed through and slidably connected in the guide sleeve 3. One end of the guide rod 4 is fixedly connected to the top of the upper friction body 19 (the upper friction body can be connected by an adjusting bolt that passes through the guide rod, so that the height of the upper friction body can be adjusted by rotating the adjusting bolt, thereby applying different loads). The upper friction body 19 moves back and forth together with the guide rod 4 through the second drive mechanism.

[0037] like Figure 1-3 As shown, the second driving mechanism includes an electric cylinder 5 arranged horizontally above the guide rod 4. The fixed end of the electric cylinder 5 is fixedly connected to the outer surface of the support plate 2, and the telescopic end is fixedly connected to a connecting plate 6. The connecting plate 6 is fixedly connected to the top end of the guide rod 4. When the electric cylinder extends or retracts, it drives the guide rod 4 to slide along the guide sleeve 3. When the electric cylinder 5 is locked, the upper friction body 19 is fixed at the set position at the top end of the lower friction body 18.

[0038] like Figure 1 As shown, the probe 9 is vertically disposed on the side of the upper friction body 19 away from the electric cylinder 5. A connecting rod 7 is horizontally connected between the probe 9 and the connecting plate 6. One end of the connecting rod 7 is fixedly connected to the top of the connecting plate 6 by a screw 8, and the other end is fixedly connected to the probe 9.

[0039] like Figure 1As shown, the controller 12 is electrically connected to a human-machine interface device (not shown in the figure), and the human-machine interface device is equipped with a servo motor control button and an electric cylinder control button.

[0040] The working principle of this embodiment:

[0041] Measuring the electrical properties of the lubricating oil interface in experiments helps to accurately and deeply study the electrical capabilities of the lubricating oil itself and evaluate the relationship between the motion of the friction pair and the electrical signals. This embodiment can simulate friction in a rotational or linear reciprocating manner. In the rotational friction mode, the electric cylinder needs to be locked, positioning the upper friction body at the center of the top of the lower friction body. Then, the servo motor is activated, causing the driving gear to drive the driven gear, which in turn rotates the lower friction body relative to the upper friction body. During this process, the probe detects the electrical signal at the lubricating oil interface, and the data is transmitted to the controller via a data acquisition instrument, then displayed on the monitor. In the linear reciprocating friction mode, the servo motor needs to be locked first, then the electric cylinder is activated, causing the upper friction body to move reciprocally along the lubricating oil interface. During this process, the guide rod slides within the guide sleeve, providing guidance. Simultaneously, since the connecting rod is directly connected to the probe, the probe moves synchronously as the upper friction body moves back and forth, allowing for potential detection at different positions on the lubricating oil interface.

[0042] This novel invention can monitor the triboelectric signals generated during the frictional motion of a friction pair and determine the relative motion state of the upper and lower friction bodies based on the monitored triboelectric signals. Specifically, when the friction pair is in a normal frictional state, the generated triboelectric potential signal is stable, and when the friction stops, the generated triboelectric potential signal dissipates. Because this invention uses a non-contact method to measure the potential, it avoids direct contact between the probe and the lubricating oil interface of the object being measured, thereby reducing the impact of contact interference on the measurement results.

[0043] In addition, the method provided by this invention can realize real-time and dynamic monitoring of friction pairs, with a sensitive response. It can monitor without opening or damaging the friction pairs, and the measuring device is easy to install. The method provided by this invention is applicable to friction pairs under various lubrication conditions. The contact methods include point contact, line contact and surface contact, and the motion forms include linear motion, linear reciprocating motion and rotary motion.

Claims

1. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction, characterized by: The friction pair comprises an upper friction body and a lower friction body, a lubricating oil interface is arranged on the contact surface of the upper friction body and the lower friction body, a probe of the non-contact electrostatic potential measuring instrument is arranged above the lubricating oil interface, the non-contact electrostatic potential measuring instrument is signal connected with the data acquisition instrument through a wire, the data acquisition instrument is electrically connected with the controller through a wire, and the controller is electrically connected with the power supply and the display through wires.

2. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction as claimed in claim 1, characterized in that: The friction pair is connected to a friction tester.

3. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction as claimed in claim 1, characterized in that: The friction pair is a friction pair used in actual working conditions.

4. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction as recited in claim 1, characterized by: The lower friction body is rotatably connected to a workbench, and the top end of the workbench is provided with a first driving mechanism for driving the lower friction body to rotate.

5. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction as claimed in claim 4, characterized in that: The first driving mechanism comprises a driving gear, the top end of the workbench is provided with a servo motor, the output shaft of the servo motor extends upward along the longitudinal direction and is fixedly connected with the central shaft hole of the driving gear, one side of the servo motor is provided with a rotating shaft, the bottom end of the rotating shaft is rotatably connected to the workbench through a bearing, and the top end of the rotating shaft is fixedly connected with a driven gear, the top end of the driven gear is provided with a clamping groove structure, the bottom end of the lower friction body is clamped in the clamping groove, and the driving gear is meshingly connected with the driven gear.

6. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction as claimed in claim 5, characterized in that: One side of the top end of the workbench is provided with a support plate, the support plate is arranged along the longitudinal direction, a guide sleeve is longitudinally arranged on the support plate, a guide rod is longitudinally arranged in the guide sleeve and is slidably connected with the guide sleeve, one end of the guide rod is fixedly connected with the top end of the upper friction body, and the upper friction body moves back and forth together with the guide rod through a second driving mechanism.

7. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction as claimed in claim 6, characterized in that: The second driving mechanism comprises an electric cylinder arranged above the guide rod along the transverse direction, the fixed end of the electric cylinder is fixedly connected with the outer surface of the support plate, the telescopic end of the electric cylinder is fixedly connected with a connecting plate, the connecting plate is fixedly connected with the top end of the guide rod, when the electric cylinder is telescopic, the guide rod slides along the guide sleeve, and when the electric cylinder is locked, the upper friction body is fixed at a set position on the top end of the lower friction body.

8. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction as claimed in claim 7, characterized in that: The probe is arranged on the side of the upper friction body away from the electric cylinder along the vertical direction, a connecting rod is transversely arranged between the probe and the connecting plate, one end of the connecting rod is fixedly connected with the top end of the connecting plate through a screw, and the other end of the connecting rod is fixedly connected with the probe.

9. A system for testing electrostatic build-up and dissipation at oil lubricated interfaces during friction as claimed in claim 8, characterized in that: The controller is electrically connected with a man-machine interaction device, and the man-machine interaction device is provided with a servo motor control button and an electric cylinder control button.

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