Triboelectric rotation sensor

Abstract

The application discloses a triboelectric rotation sensor, which can be understood as a rotation speed sensor, and can be used for monitoring the slip rate of a rolling bearing. The rolling bearing includes: a bearing body including a rotating ring and a cage; the rotating speed sensor is arranged on the bearing body and is used for generating a coupling signal when the rotating ferrule rotates; the coupling signal comprises real-time rotating speed information of the rotating ferrule and real-time rotating speed information of the retainer. The rotating speed sensor and the bearing body can be integrated in a narrow space and used for monitoring the slip rate of the rolling bearing.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a triboelectric rotation sensor. Background Art

[0002] Existing motion monitoring technologies, such as electromagnetic, photoelectric and Hall sensors, are often limited in terms of compactness and environmental adaptability. These technologies often require modifications to the bearing structure, making it difficult to integrate monitoring equipment into the small space with rolling bearings, especially for bearings with multi-rotor structures. Even if sensors are integrated into larger bearings, the sensing unit may have a negative impact on the operating state of the bearing, especially under high-speed and heavy-load conditions. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a triboelectric rotation sensor to solve the problem of high difficulty in integrating the monitoring device with the rolling bearing when monitoring the slip rate of the rolling bearing in the prior art.

[0004] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a rolling bearing, which includes: a bearing body, including a rotating ring and a retaining frame; a speed sensor, which is arranged on the bearing body and is used to generate a coupling signal when the rotating ring rotates; the coupling signal includes real-time speed information of the rotating ring and real-time speed information of the retaining frame.

[0005] In an embodiment of the present application, the speed sensor includes a first dielectric ring, a second dielectric ring and a fixed circuit board which are arranged on the same side of the bearing body, the first dielectric ring is arranged on the rotating ring and rotates at the same speed as the rotating ring, and the second dielectric ring is arranged on the retaining frame and rotates at the same speed as the retaining frame; a pair of electrodes are provided on the fixed circuit board, and when the rotating ring rotates, the fixed circuit board moves relative to the first dielectric ring and the second dielectric ring respectively, so that the first dielectric ring and the second dielectric ring simultaneously generate electrostatic induction with the pair of electrodes, thereby generating a coupling signal.

[0006] In an embodiment of the present application, the first dielectric ring and the second dielectric ring are both formed by splicing and enclosing a plurality of fan ring segments, and in both cases, one of each two adjacent fan ring segments is made of dielectric material and the other is made of non-dielectric material; the center angle of each fan ring segment of the dielectric material of the first dielectric ring is consistent with the center angle of each fan ring segment of the dielectric material of the second dielectric ring; a pair of electrodes are two circumferentially adjacent fan ring electrodes, and the center angle of each fan ring electrode is the same as the center angle of each fan ring segment of the dielectric material.

[0007] In an embodiment of the present application, the bearing body further includes a fixed ring, the retaining frame is located between the fixed ring and the rotating ring, the speed sensor further includes a fixing member, and the fixed circuit board is arranged on the fixed ring through the fixing member.

[0008] In an embodiment of the present application, the fixed circuit board is in the shape of a ring and has a front side facing the bearing body and a back side opposite to the front side, and a pair of electrodes are located on the front side of the fixed circuit board; a pair of soldering pads for connecting wires are provided on the back side of the fixed circuit board, and the pair of soldering pads are connected to the pair of electrodes in a one-to-one correspondence.

[0009] In an embodiment of the present application, the speed sensor also includes an annular gasket located between the fixed circuit board and the fixed ring, and the annular gasket is arranged on the front side of the fixed circuit board; the fixing piece is arranged on the side of the annular gasket away from the fixed ring, and is used to fix the annular gasket and the fixed circuit board on the fixed ring together.

[0010] In the embodiment of the present application, the fixing member is a ring-shaped magnetic adsorption member.

[0011] In the embodiment of the present application, the bearing body, the first dielectric ring, the second dielectric ring, the fixed circuit board, the annular gasket, and the fixing member are coaxially arranged.

[0012] In the embodiment of the present application, the thickness of the annular gasket is 0.5mm-1mm.

[0013] In the embodiment of the present application, the first dielectric ring is adhered to the end surface of the rotating ring, and the second dielectric ring is adhered to the end surface of the retaining frame; the annular gasket is glued to the fixed circuit board.

[0014] In the embodiment of the present application, the outer end surface of the first dielectric ring and the outer end surface of the second dielectric ring are located in the same plane.

[0015] The second aspect of the present application provides a system for monitoring the slip rate of rolling bearings, the system comprising: the above-mentioned rolling bearing; a signal acquisition device, connected to the speed sensor signal of the rolling bearing, for collecting coupling signals; and a signal processing device, connected to the signal acquisition device, for acquiring the coupling signal and decoupling the coupling signal, and determining the slip rate of the rolling bearing based on the decoupling result.

[0016] In an embodiment of the present application, the signal processing device is further used to: determine the main frequency and secondary frequency of the coupling signal; determine the slip rate of the rolling bearing based on the main frequency and the secondary frequency; wherein the main frequency corresponds to the rotational speed of the rotating ring, and the secondary frequency corresponds to the rotational speed of the retaining frame.

[0017] In an embodiment of the present application, the signal processing device is further used to: perform fast Fourier transform on the coupled signal to determine the spectrum of the coupled signal; obtain the frequency point with the largest amplitude value in the spectrum as the main frequency; obtain the frequency point with the second largest amplitude value in the spectrum as the secondary frequency.

[0018] A third aspect of the present application provides a friction electric rotation sensor, which is used to be installed on a multi-rotor test piece, the multi-rotor test piece includes a stator and at least two rotors that can rotate simultaneously, and the rotation speed of each rotor is different; the friction electric rotation sensor includes a fixed circuit board and at least two dielectric rings, the number of dielectric rings is consistent with the number of rotors of the multi-rotor test piece and corresponds one to one, each dielectric ring can be arranged on the corresponding rotor and rotate at the same speed as the rotor; the fixed circuit board is configured to remain relatively still with the stator when each rotor rotates, a pair of electrodes is provided on the fixed circuit board, and at least two dielectric rings can simultaneously generate electrostatic induction with the pair of electrodes to generate a coupling signal; the coupling signal contains real-time rotation speed information of each rotor.

[0019] In an embodiment of the present application, each dielectric ring is formed by splicing and enclosing a plurality of fan-ring segments, one of each two adjacent fan-ring segments in each dielectric ring is made of dielectric material, and the other is made of non-dielectric material; the central angles of the fan-ring segments of the dielectric material of all dielectric rings are consistent; a pair of electrodes are two circumferentially adjacent fan-ring electrodes, and the central angle of each fan-ring electrode is the same as the central angle of each fan-ring segment of the dielectric material.

[0020] The fourth aspect of the present application provides a signal decoupling method, which is used for the above-mentioned triboelectric rotation sensor, and the signal decoupling method includes: obtaining a coupling signal generated by the triboelectric rotation sensor; performing a fast Fourier transform on the coupling signal to obtain a spectrum of the coupling signal; determining at least two frequency points in the spectrum with amplitude values ​​from large to small; the number of frequency points is consistent with the number of rotors of the multi-rotor test piece; and corresponding at least two frequency points to the rotational speed of each rotor respectively.

[0021] Through the above technical scheme, the rolling bearing is provided with a bearing body and a speed sensor, the bearing body includes a rotating ring and a retaining frame, the speed sensor is arranged on the bearing body and is used to generate a coupling signal when the bearing body rotates, the coupling signal includes the real-time speed information of the rotating ring and the real-time speed information of the retaining frame, by decoupling the coupling signal, the real-time speed information of the rotating ring and the retaining frame can be obtained, and then the slip rate of the rolling bearing can be calculated according to the real-time speed information of the two, thereby realizing the integration of the speed sensor and the bearing body in a small space and real-time monitoring of the slip rate of the rolling bearing.

[0022] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0024] Figure 1 Schematically shows an explosion of a rolling bearing according to an embodiment of the present application Figure 1 ;

[0025] Figure 2 Schematically shows an explosion of a rolling bearing according to an embodiment of the present application Figure 2 ;

[0026] Figure 3 A three-dimensional diagram schematically shows a bearing body, a first dielectric ring, and a second dielectric ring according to an embodiment of the present application;

[0027] Figure 4 A three-dimensional diagram of a bearing body according to an embodiment of the present application is schematically shown;

[0028] Figure 5 A three-dimensional diagram schematically shows a retaining frame and a second dielectric ring according to an embodiment of the present application;

[0029] Figure 6 A plan view schematically shows a fixed circuit board and a fixing member according to an embodiment of the present application;

[0030] Figure 7 A partial cross-sectional view schematically shows a fixed circuit board, a fixing member and an annular gasket according to an embodiment of the present application;

[0031] Figure 8 A side sectional view of a rolling bearing (partial) according to an embodiment of the present application is schematically shown;

[0032] Fig. 9 A structural diagram of a system for monitoring the slip rate of a rolling bearing according to an embodiment of the present application is schematically shown;

[0033] Fig.10 The diagram schematically shows a process diagram of generating and decoupling a coupling signal according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0038] In the embodiment of the present application, the rotation speed sensor may be a triboelectric rotation sensor.

[0039] Figure 1 Schematically shows an explosion of a rolling bearing according to an embodiment of the present application Figure 1 . Figure 2 Schematically shows an explosion of a rolling bearing according to an embodiment of the present application Figure 2 .like Figure 1 and Figure 2As shown, an embodiment of the present application provides a rolling bearing 100, which may include: a bearing body 110, including a rotating ring and a retaining frame 200; a speed sensor 300, which is arranged on the bearing body 110 and is used to generate a coupling signal when the rotating ring rotates; the coupling signal includes real-time speed information of the rotating ring and real-time speed information of the retaining frame 200.

[0040] In the embodiment of the present application, the bearing body 110 can be understood as an existing standard rolling bearing part, which is generally composed of four parts: an inner ring, an outer ring, a rolling element and a cage. The above-mentioned rotating ring can be an inner ring or an outer ring; if the inner ring is a rotating ring, the outer ring can be called a fixed ring, and vice versa. For example, when a rotating shaft is sleeved in the inner ring, the rotation of the rotating shaft will drive the inner ring to rotate. At this time, the inner ring is a rotating ring and the outer ring is a fixed ring; when a fixed shaft is sleeved in the inner ring and a rotating component is sleeved on the outer ring, the rotation of the rotating component will drive the outer ring to rotate. At this time, the outer ring is a rotating ring and the inner ring is a fixed ring. According to the inherent structural characteristics of the bearing body 110, when the rotating ring rotates, its speed is much greater than the speed of the cage. The difference in the speeds of the two also provides basic conditions for the generation of coupling signals and subsequent decoupling.

[0041] In an embodiment of the present application, the speed sensor 300 may include a first dielectric ring 120, a second dielectric ring 220 and a fixed circuit board 320 arranged on the same side of the bearing body. The first dielectric ring 120 is arranged on the rotating ring and rotates at the same speed as the rotating ring. A pair of electrodes is provided on the fixed circuit board 320. When the rotating ring rotates, the fixed circuit board 320 moves relative to the first dielectric ring 120 and the second dielectric ring 220 respectively, so that the first dielectric ring 120 and the second dielectric ring 220 simultaneously generate electrostatic induction with the pair of electrodes, thereby generating a coupling signal; at this time, the speed sensor 300 can be understood as a friction electric sensing unit.

[0042] In the embodiment of the present application, the first dielectric ring 120 is disposed on the rotating ring, and the second dielectric ring 220 is disposed on the retaining frame 200. When the rotating ring rotates, the fixed circuit board 320 and the first dielectric ring 120 and the second dielectric ring 220 move relative to each other, which can be understood as, when the rotating ring rotates, the fixed circuit board 320 and the first dielectric ring 120 move relative to each other, and the fixed circuit board 320 and the first dielectric ring 120 move relative to each other. Furthermore, when the rotating ring rotates, the fixed circuit board 320 can be in a stationary state, or it can rotate at a speed different from that of the first dielectric ring 120 and the second dielectric ring 220, so that when the rotating ring rotates, the fixed circuit board 320 can produce friction-like actions with the first dielectric ring 120 and the second dielectric ring 220 respectively, thereby enabling the first dielectric ring 120 and the second dielectric ring 220 to simultaneously generate friction electricity with a pair of electrodes on the fixed circuit board 320, thereby prompting a pair of electrodes of the fixed circuit board 320 to generate a multi-frequency wave signal with two frequency signals superimposed during the rotation of the rotating ring, i.e., the above-mentioned coupling signal.

[0043] Both rotate at the same speed as the rotating ring and the retaining frame 200, which indicates that the movement of the two dielectric rings directly reflects the movement state of the rotating ring and the retaining frame. Therefore, the speed sensor 300 can accurately sense the speed of the rotating ring and the speed of the retaining frame 200, as well as the speed difference between the two.

[0044] In the embodiment of the present application, the first dielectric ring 120 and the second dielectric ring 220 are both formed by splicing and enclosing a plurality of fan ring segments, and in both cases, one of each two adjacent fan ring segments is made of dielectric material and the other is made of non-dielectric material; the center angle of each fan ring segment of the dielectric material of the first dielectric ring is consistent with the center angle of each fan ring segment of the dielectric material of the second dielectric ring; a pair of electrodes are two circumferentially adjacent fan ring electrodes, and the center angle of each fan ring electrode is the same as the center angle of each fan ring segment of the dielectric material.

[0045] In an embodiment of the present application, both dielectric rings are formed by splicing and enclosing a plurality of fan ring segments. Of the two adjacent fan ring segments of each dielectric ring, one is a dielectric material and the other is a non-dielectric material. Since the center angles of the fan ring segments of each dielectric material of the first dielectric ring 120 and the second dielectric ring 220 are consistent, and the center angle of each fan ring electrode is the same as the center angle of each fan ring segment of the dielectric material, the design of the consistency of the center angle ensures that when the dielectric ring follows the rotation of the retaining frame or the fixed ring, the electrostatic induction between the electrode and the dielectric ring can generate a stable and predictable coupling signal. This is very important for the accuracy and consistency of the signal, reduces the problem of signal distortion caused by structural asymmetry or angle mismatch, and further improves the measurement accuracy.

[0046] In one embodiment, since the dielectric ring is composed of alternating ring segments of dielectric and non-dielectric materials, when rotating, the electrode will periodically interact with the ring segments of different materials to generate a signal with a specific frequency and phase. By controlling the center angle of the ring segment and the dielectric material, the frequency and intensity of the signal can also be adjusted, thereby achieving precise control of the signal characteristics. Preferably, the dielectric ring can be designed with 12 equal parts, and can also be designed with 16 equal parts or more to improve the resolution.

[0047] Figure 3 A three-dimensional diagram schematically shows a bearing body, a first dielectric ring, and a second dielectric ring according to an embodiment of the present application; Figure 4 A three-dimensional diagram of a bearing body according to an embodiment of the present application is schematically shown. In the embodiment of the present application, Figure 3 and Figure 4 As shown, the first dielectric ring 120 is adhered to the end face 113 of the rotating ring, the second dielectric ring 220 is adhered to the end face 211 of the retainer; and the annular gasket 310 is glued to the fixed circuit board 320. Since the plane where the end face 211 of the retainer is located is closer to the middle surface of the bearing body 110 than the end face 113 of the rotating ring, in order to ensure that the dielectric layer 121 of the first dielectric ring and the dielectric layer 221 of the second dielectric ring are in the same plane, the thickness of the second dielectric ring 220 can be slightly greater than the thickness of the first dielectric ring 120, so that the induced electrical signals generated by the first dielectric ring and the second dielectric ring when the rolling bearing 100 rotates can be kept in a higher range. The fixing member 330 is arranged on the side of the annular gasket 310 away from the fixed ring, and is used to fix the annular gasket 310 and the fixed circuit board 320 on the end face 111 of the fixed ring together.

[0048] In the embodiment of the present application, the dielectric material of the first dielectric ring 120 and the second dielectric ring 220 is a polymer material with a triboelectric effect, preferably, polytetrafluoroethylene (PTFE), polyperfluoroethylene propylene (FEP) or polyimide (PI). Preferably, the electrode material of the fixed circuit board 320 can be a copper electrode or an aluminum electrode.

[0049] In the embodiment of the present application, the bearing body may further include a fixed ring, and the speed sensor 300 may further include a fixing member 330. The fixing circuit board 320 is arranged on the fixing ring through the fixing member 330. The structural form of the fixing member 330 includes but is not limited to threaded connection, snap connection, bonding, magnetic adsorption connection, etc. When the inner ring is used as a rotating ring to rotate, the outer ring can be used as a fixed ring, and remain relatively still with the fixed circuit board 320 when the inner ring rotates; conversely, when the outer ring is used as a rotating ring to rotate, the inner ring can be used as a fixed ring, and remain relatively still with the fixed circuit board 320 when the outer ring rotates. In other words, the fixed ring can be the outer bearing ring (i.e., the outer ring) of the bearing body 110, or the inner bearing ring (i.e., the inner ring) of the bearing body 110, and is specifically set according to the installation and use of the bearing body 110. By fixing the fixed circuit board 320 on the fixed ring, the fixed circuit board 320 can always remain relatively still with the fixed ring during the rotation of the first dielectric ring 120 and the second dielectric ring 220, thereby ensuring the stable generation of the coupling signal. It should be noted that the fixed circuit board 320 may not be installed on the fixed ring, as long as the fixed circuit board 320 can always remain relatively still with the fixed ring when the first dielectric ring 120 and the second dielectric ring 220 rotate. For example, the fixed circuit board 320 can also be fixed by reasonably designing the bearing seat and using the bearing retaining ring and other structures of the bearing seat.

[0050] Figure 5 A schematic diagram of a retaining frame and a second dielectric ring according to an embodiment of the present application is shown. Figure 5 As shown, the cage body 210 is used to ensure that the rolling elements 112 are evenly distributed around the entire circumference of the bearing raceway, and at the same time ensure that the rolling elements 112 do not contact each other. When the bearing is normally installed, the rolling elements 112 are located in the through grooves 212 of the cage body 210, so the rotation speed of the cage 200 is also the revolution speed of the rolling elements 112. The cage body 210 can stably control the movement of the rolling elements 112, thereby ensuring the stability and accuracy of the rolling bearing 100 during operation.

[0051] In the embodiment of the present application, the fixed circuit board 320 is in the shape of a ring and has a front side facing the bearing body 110 and a back side opposite to the front side, and a pair of electrodes are located on the front side of the fixed circuit board 320; a pair of soldering pads for connecting wires are provided on the back side of the fixed circuit board 320, and the pair of soldering pads are connected to the pair of electrodes in a one-to-one correspondence.

[0052] In the embodiment of the present application, the speed sensor 300 may also include an annular gasket 310 located between the fixed circuit board 320 and the fixed ring, and the annular gasket 310 is arranged on the front side of the fixed circuit board 320; the fixing member 330 is arranged on the side of the annular gasket 310 away from the fixed ring, and is used to fix the annular gasket 310 and the fixed circuit board 320 on the fixed ring together.

[0053] In the embodiment of the present application, the fixing member 330 is an annular magnetic adsorption member, such as a magnetic ring with magnetic force.

[0054] Figure 6 A plan view schematically shows a fixed circuit board and a fixing member according to an embodiment of the present application; Figure 7 A partial cross-sectional view of a fixed circuit board, a fixing member and an annular gasket according to an embodiment of the present application is schematically shown. Figure 6 and Figure 7 As shown, in the embodiment of the present application, the side 311 of the annular gasket 310 facing the fixed ring can contact the end face 111 of the fixed ring, the front face 321 of the fixed circuit board 320 can be glued to the side 312 of the annular gasket 310 away from the fixed ring, and the fixing member 330 can be a magnetic ring. The fixing member 330 can absorb the speed sensor 300 on the bearing body 110 through the magnetic force of the end face 331 of one side facing the fixed ring through the annular gasket 310. A wire is respectively welded to the pads 324 and 325 on the back of the fixed circuit board 320 for deriving signals.

[0055] In the embodiment of the present application, the fixed circuit board 320 adopts an annular double-sided design, so that it can tightly surround the bearing body 110 and avoid axial interference between the fixed circuit board 320 and the rotating parts (such as rotating shafts, etc.) installed on the bearing body 110, thereby effectively utilizing the space around the bearing body 110 and avoiding unnecessary volume occupation, so that the entire rolling bearing 100 and the speed sensor 300 are more compactly combined, thereby improving the integration of the speed sensor 300 and the bearing body 110.

[0056] In the embodiment of the present application, the bearing body 110 , the first dielectric ring 120 , the second dielectric ring 220 , the fixed circuit board 320 , the annular gasket 310 , and the fixing member 330 are coaxially arranged.

[0057] In the embodiment of the present application, all key components are arranged along the same axis, ensuring precise spatial alignment of the components in the rolling bearing 100. This alignment reduces the risk of misalignment or offset between components and maintains the overall stability and operating accuracy of the rolling bearing 100. Improving the operating accuracy of the rolling bearing 100 can reduce vibration and imbalance during the operation of the rolling bearing 100, and improve the overall stability and service life.

[0058] In the embodiment of the present application, the thickness of the annular gasket 310 is 0.5mm-1mm. The thickness of the annular gasket 310 directly determines the axial distance between the first dielectric ring 120, the second dielectric ring 220 and the fixed circuit board 320. This distance has a great influence on the performance of the friction electric sensor unit and is preferably about 0.5mm.

[0059] In the embodiment of the present application, the outer end surface of the first dielectric ring and the outer end surface of the second dielectric ring are located in the same plane.

[0060] In the embodiment of the present application, if the dielectric layer 121 or 221 is in direct contact with the copper electrodes 322 and 323 or the output signal is too small, the thickness of the annular gasket 310 can be appropriately increased or decreased. Preferably, the material of the annular gasket 310 can be a resin formed by photocuring, the fixing member 330 can be a neodymium magnet with strong magnetism, and the wire can be a copper wire or an aluminum wire with a diameter of about 0.1 mm.

[0061] Figure 8 Schematically shows a side sectional view of a rolling bearing (partial) according to an embodiment of the present application; Figure 8 As shown, in the embodiment of the present application, Figure 8 As shown, the fixing member 330 fixes a plane formed by gluing the fixing circuit board 320 and the annular gasket 310 on the outermost ring end face 111 of the bearing body 110, and there is a certain gap between the fixing circuit board 320 and the first dielectric ring 120 and the second dielectric ring 220. The rolling body 112 is located in the through groove 212 of the retainer body 210.

[0062] In the embodiments of the present application, Fig. 9 As shown, an embodiment of the present application provides a system for monitoring the slip rate of a rolling bearing, which system may include: the above-mentioned rolling bearing; a signal acquisition device, which is connected to the speed sensor signal of the rolling bearing and is used to collect a coupling signal; and a signal processing device, which is connected to the signal acquisition device and is used to obtain the coupling signal and decouple the coupling signal, and determine the slip rate of the rolling bearing according to the decoupling result.

[0063] In an embodiment of the present application, the signal processing device is further used to: determine the main frequency and secondary frequency of the coupling signal; determine the slip rate of the rolling bearing based on the main frequency and the secondary frequency; wherein the main frequency corresponds to the rotational speed of the rotating ring, and the secondary frequency corresponds to the rotational speed of the retaining frame.

[0064] In an embodiment of the present application, the signal processing device is further used to: perform fast Fourier transform on the coupled signal to determine the spectrum of the coupled signal; obtain the frequency point with the largest amplitude value in the spectrum as the main frequency; obtain the frequency point with the second largest amplitude value in the spectrum as the secondary frequency.

[0065] In an embodiment of the present application, the signal acquisition device 420 is connected to the speed sensor signal of the rolling bearing 410, and the signal can be exported through a wire respectively welded on the pads 324 and 325 on the back of the fixed circuit board 320 in the above scheme. Optionally, the signal can also be exported in a wireless form such as infrared.

[0066] In an embodiment of the present application, the signal processing device 430 performs a fast Fourier transform on the coupling signal collected by the signal acquisition device 420 to obtain the frequency spectrum of the coupling signal. According to the Fourier transform, a complex signal or function can be decomposed into a superposition of multiple sine waves with different frequencies, amplitudes and phases. This principle theoretically confirms the feasibility of monitoring multiple frequency points by collecting and analyzing the signal of a channel. The coupling signal may include the speed information of the first dielectric ring 120 and the speed information of the second dielectric ring 220. The signal processing device 430 continues to process the amplitude value in the spectrum, taking the frequency point with the largest amplitude value as the main frequency and the frequency point with the second largest amplitude value as the secondary frequency. The main frequency corresponds to the speed of the first dielectric ring 120, and the secondary frequency corresponds to the speed of the second dielectric ring. According to the relevant formula and the speeds of the above two, the slip rate of the rolling bearing 100 can be determined.

[0067] In an embodiment of the present application, a friction electric rotation sensor is also provided, which is used to be installed on a multi-rotor test piece. The multi-rotor test piece may include a stator and at least two rotors that can rotate simultaneously, and the rotation speed of each rotor is different; the friction electric rotation sensor may include a fixed circuit board and at least two dielectric rings, the number of dielectric rings is consistent with the number of rotors of the multi-rotor test piece and corresponds one to one, and each dielectric ring can be arranged on the corresponding rotor and rotate at the same speed as the rotor; the fixed circuit board is configured to remain relatively still with the stator when each rotor rotates, and a pair of electrodes is provided on the fixed circuit board, and at least two dielectric rings can simultaneously generate electrostatic induction with the pair of electrodes to generate a coupling signal; the coupling signal contains real-time rotation speed information of each rotor.

[0068] In an embodiment of the present application, each dielectric ring is formed by splicing and enclosing a plurality of fan ring segments, one of each two adjacent fan ring segments in each dielectric ring is made of dielectric material, and the other is made of non-dielectric material; the center angles of the fan ring segments of the dielectric material of all dielectric rings are consistent; a pair of electrodes are two circumferentially adjacent fan ring electrodes, and the center angle of each fan ring electrode is the same as the center angle of the fan ring segment of each dielectric material. Since the center angles of the fan ring segments of each dielectric material are consistent, and the center angle of each fan ring electrode is the same as the center angle of the fan ring segment of each dielectric material, the design of the consistency of the center angle ensures that when the dielectric ring rotates with the retaining frame or the fixed ring, the electrostatic induction between the electrode and the dielectric ring can generate a stable and predictable coupling signal. This is very important for the accuracy and consistency of the signal, and reduces the problem of signal distortion caused by structural asymmetry or angle mismatch.

[0069] In an embodiment of the present application, a signal decoupling method for the above-mentioned triboelectric rotation sensor is also provided, and the signal decoupling method may include: obtaining a coupling signal generated by the triboelectric rotation sensor; performing a fast Fourier transform on the coupling signal to obtain a spectrum of the coupling signal; determining at least two frequency points in the spectrum with amplitude values ​​from large to small; the number of frequency points is consistent with the number of rotors of the multi-rotor test piece; and corresponding at least two frequency points to the rotational speed of each rotor respectively.

[0070] In the embodiment of the present application, the signal decoupling method of the triboelectric rotation sensor can be used for the triboelectric rotation sensor, and the triboelectric rotation sensor can be used for the multi-rotor test piece, and the number of frequency points should be consistent with the number of rotors of the multi-rotor test piece. After obtaining the frequency points in the spectrum, the frequency point with the largest amplitude value corresponds to the fastest rotor speed, and so on, the frequency point with the smallest amplitude value corresponds to the slowest rotor speed.

[0071] In the embodiments of the present application, Fig.10 A schematic diagram of a process of generating and decoupling a coupling signal according to an embodiment of the present application is shown, as shown in FIG. Fig.10As shown. When the rolling bearing is working, the first dielectric ring 120 (i.e., the inner ring dielectric ring) and the second dielectric ring 220 (i.e., the retaining frame dielectric ring) rotate at different speeds relative to the speed sensor 300. When the fixed circuit board 320 is excited by the first dielectric ring 120 alone, a first signal with a higher frequency (i.e., the inner ring signal) will be generated; when the fixed circuit board 320 is excited by the second dielectric ring 220 alone, a second signal with a lower frequency (i.e., the retaining frame signal) will be generated; if the copper electrodes 322 and 323 of the fixed circuit board 320 are excited by the above two signals at the same time, a superposition of the two signals will be generated, i.e., a coupled signal. The coupled signal is also a multi-frequency wave superimposed by the two signals, and the period of the multi-frequency wave is the least common multiple of the periods of the two waveforms that constitute it. The coupled signal contains the speed information of the first dielectric ring (i.e., the inner ring) and the second dielectric ring (i.e., the retaining frame) at the same time. The signal acquisition device 420 acquires the above-mentioned coupling signal in real time, and performs fast Fourier transform to obtain the spectrum of the coupling signal, and then extracts the frequency points with the largest and second largest amplitude values ​​in the spectrum, that is, the main frequency and secondary frequency of the signal, respectively, to achieve signal decoupling, wherein the largest frequency point (that is, the main frequency, frequency 2) corresponds to the rotational speed (that is, speed 2) of the first dielectric ring 120 (that is, inner ring), and the second largest frequency point (that is, speed 1) corresponds to the rotational speed (that is, speed 1) of the second dielectric ring 220 (that is, retaining frame), and finally, the slip rate of the rolling bearing can be calculated according to the formula.

[0072] In the embodiment of the present application, when the rolling bearing 100 is working, the shaft system drives the inner ring of the bearing to rotate together, and at the same time, the rolling body 112 generates rolling friction with the inner ring and outer ring raceways, and the rolling body 112 rotates while driving the retaining frame 200 to revolve relative to the inner ring bearing. During this period, for each rotation of the inner ring, the first dielectric ring 120 will generate multiple electrostatic inductions with the fixed circuit board 320, and each induction will generate a waveform of one cycle. In the initial state, the first dielectric ring 120 is aligned with the copper electrode 322. Due to the difference in the electronegativity of the materials, the first dielectric ring 120 accumulates negative charges on the surface. According to the law of conservation of charge, the surface of the copper grid accumulates an equal amount of positive charges. At this time, the positive and negative charges cancel each other out and are in an electrostatic equilibrium state. When the first dielectric ring 120 rotates under the drive of the retaining frame 200, the first dielectric ring 120 begins to rotate relative to the copper electrode 322 and gradually contacts the copper electrode 323. This will generate a potential difference between the two electrodes, causing the positive charge to flow from the copper electrode 322 to the copper electrode 323 in the direction of rotation. When the first dielectric ring 120 and the copper electrode 323 completely overlap, all positive charges are transferred to the copper electrode 323, returning to an electrostatic equilibrium state. As the first dielectric ring 120 continues to rotate, the positive charges on the copper electrode 323 flow in the opposite direction again, toward the copper electrode 322, forming a reverse current in the external circuit. As the inner ring of the bearing continues to rotate, the above charge transfer process repeats periodically. The working principle of the second dielectric ring and the copper electrode on the fixed circuit board 320 to generate electrical signals is similar, but the frequencies of the two signals are completely different.

[0073] In one embodiment, the speed sensor may include the above-mentioned fixing member 330, the fixing circuit board 320, the annular gasket 310 and a plurality of dielectric rings, wherein the number of the dielectric rings corresponds to the number of rotors of the multi-rotor test piece, the dielectric rings are arranged on the end surface of the rotor of the multi-rotor test piece facing the fixing circuit board 320, the fixing circuit board 320 has a pair of electrodes on the front side facing the multi-rotor test piece, a pair of pads are arranged on the opposite side of the pair of electrodes, i.e., the side facing away from the multi-rotor test piece, and the pair of pads are provided with wires for transmitting signals.

[0074] In one embodiment, the retainer may be a copper alloy cage-type retainer, a crown-type or cage-type retainer of a non-metallic composite material, and a wave-type retainer after redesigning the connection method between the retainer and the dielectric ring.

[0075] Through the above technical solution, dielectric rings corresponding to the number of rotors are attached to the multi-rotor test piece. According to the law of conservation of charge, when the multi-rotor test piece rotates, the corresponding dielectric rings will generate coupling signals with the above pair of electrodes, and the above coupling signals are processed by the above signal acquisition device and signal processing device, thereby obtaining the rotation speed of each rotor of the multi-rotor test piece for calculation of slip rate or other parameters. Since the triboelectric rotation sensor is compact and can be integrated with the multi-rotor test piece, the above technical solution can improve the integration of the triboelectric rotation sensor and the multi-rotor test piece while realizing the monitoring of the rotation speed of the multi-rotor test piece.

[0076] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0077] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 Rolling bearing with the function specified in one or more boxes.

[0078] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce a product including an instruction rolling bearing, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0079] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0080] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0081] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A rolling bearing, comprising a bearing body, wherein the bearing body comprises a rotating ring and a retaining frame, characterized in that: The rolling bearing also includes: A rotation speed sensor is arranged on the bearing body and is used to generate a coupling signal when the rotating ring rotates; the coupling signal includes real-time rotation speed information of the rotating ring and real-time rotation speed information of the retaining frame.

2. The rolling bearing according to claim 1, characterized in that: The speed sensor includes a first dielectric ring, a second dielectric ring and a fixed circuit board which are arranged on the same side of the bearing body. The first dielectric ring is arranged on the rotating ring and rotates at the same speed as the rotating ring. The second dielectric ring is arranged on the retaining frame and rotates at the same speed as the retaining frame. A pair of electrodes is arranged on the fixed circuit board. When the rotating ring rotates, the fixed circuit board moves relative to the first dielectric ring and the second dielectric ring respectively, so that the first dielectric ring and the second dielectric ring simultaneously generate electrostatic induction with the pair of electrodes, thereby generating the coupling signal.

3. The rolling bearing according to claim 2, characterized in that: The first dielectric ring and the second dielectric ring are both formed by splicing and enclosing a plurality of fan ring segments, and in both cases, one of each two adjacent fan ring segments is made of dielectric material and the other is made of non-dielectric material; the center angle of each fan ring segment of the dielectric material of the first dielectric ring is consistent with the center angle of each fan ring segment of the dielectric material of the second dielectric ring; the pair of electrodes are two circumferentially adjacent fan ring electrodes, and the center angle of each fan ring electrode is the same as the center angle of each fan ring segment of the dielectric material.

4. The rolling bearing according to claim 2 or 3, characterized in that: The bearing body further includes a fixed ring, and the retaining frame is located between the fixed ring and the rotating ring; the rotation speed sensor further includes a fixing member, and the fixed circuit board is arranged on the fixed ring through the fixing member.

5. The rolling bearing according to claim 4, characterized in that: The fixed circuit board is annular in shape and has a front side facing the bearing body and a back side opposite to the front side, and the pair of electrodes are located on the front side of the fixed circuit board; a pair of soldering pads for connecting wires are provided on the back side of the fixed circuit board, and the pair of soldering pads are connected to the pair of electrodes in a one-to-one correspondence.

6. The rolling bearing according to claim 5, characterized in that: The speed sensor also includes an annular gasket located between the fixed circuit board and the fixed ring, and the annular gasket is arranged on the front side of the fixed circuit board; the fixing member is arranged on the side of the annular gasket away from the fixed ring, and is used to fix the annular gasket and the fixed circuit board on the fixed ring together.

7. The rolling bearing according to claim 6, characterized in that: The fixing member is a ring-shaped magnetic adsorption member.

8. A system for monitoring the slip rate of a rolling bearing, characterized in that: include: The rolling bearing according to any one of claims 1 to 7; A signal acquisition device, connected to the rotation speed sensor signal of the rolling bearing, for acquiring the coupling signal; as well as A signal processing device is connected to the signal acquisition device, and is used to obtain the coupling signal and determine the main frequency and secondary frequency of the coupling signal; the slip rate of the rolling bearing is determined according to the main frequency and the secondary frequency; wherein the main frequency corresponds to the rotational speed of the rotating ring, and the secondary frequency corresponds to the rotational speed of the retaining frame.

9. A triboelectric rotation sensor, characterized in that: Used to be installed on a multi-rotor test piece, the multi-rotor test piece includes a stator and at least two rotors that can rotate simultaneously, and the rotation speed of each rotor is different; the friction electric rotation sensor includes a fixed circuit board and at least two dielectric rings, the number of the dielectric rings is consistent with the number of rotors of the multi-rotor test piece and corresponds one to one, and each dielectric ring can be arranged on the corresponding rotor and rotate at the same speed as the rotor; the fixed circuit board is configured to remain relatively still with the stator when each of the rotors rotates, a pair of electrodes is provided on the fixed circuit board, and the at least two dielectric rings can simultaneously generate electrostatic induction with the pair of electrodes to generate a coupling signal; the coupling signal contains real-time rotation speed information of each of the rotors.

10. A signal decoupling method for a triboelectric rotation sensor as claimed in claim 9, characterized in that: include: Acquiring the coupling signal generated by the triboelectric rotation sensor; Performing a fast Fourier transform on the coupled signal to obtain a frequency spectrum of the coupled signal; Determine at least two frequency points in the frequency spectrum with amplitude values ​​from large to small; the number of the frequency points is consistent with the number of rotors of the multi-rotor test piece; The at least two frequency points are respectively corresponded to the rotation speed of each of the rotors.

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