An intelligent bearing

Abstract

An intelligent bearing, comprising a bearing body, the bearing body including an outer ring and an inner ring, a lubricating groove being provided on the surface of the outer ring, and a plurality of lubricating holes communicating with the interior of the bearing body being provided on the lubricating groove, wherein: the intelligent bearing further includes a sensor group, and the sensor group is disposed in the lubricating holes and / or the lubricating groove. The intelligent bearing of the present invention transmits signals through the sensor group installed in the areas where the bearing is prone to failure - the lubricating groove and / or the lubricating holes, so as to realize in-situ monitoring, and perform real-time status monitoring on dynamic parameters such as temperature, humidity, vibration acceleration and strain during the operation of the bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and particularly to an intelligent bearing. Background Art

[0002] Bearings are one of the important components in rotating mechanical equipment, and their operating status will directly affect the stability of the entire equipment. Although bearings have the advantages of small frictional resistance, high efficiency, fast start-up, convenient installation, and low manufacturing cost, they may be damaged due to certain reasons during operation, such as bearing use failures caused by improper assembly, poor lubrication, foreign object intrusion, etc.; on the other hand, even if the bearing is initially assembled and applied properly and maintained normally, after a period of operation, the bearing may also experience wear and fatigue spalling. Once the bearing is damaged, it will cause the equipment to stop, which may result in huge economic losses and even casualties.

[0003] Currently, during the health status monitoring of bearings, some simple instruments are usually used to judge the operating status and damage of bearings. However, since human experience accounts for most factors in the step of judging whether there are faults and damages, the accuracy and credibility of the diagnosis results are relatively poor. In particular, it is impossible to monitor the real-time status of bearings, resulting in the inability to take measures at the first time when a fault occurs and before a fault occurs. Summary of the Invention

[0004] In view of this, the present invention provides an intelligent bearing with high reliability and without damaging the internal structure of the bearing.

[0005] The intelligent bearing of the present invention includes a bearing body, the bearing body includes an outer ring and an inner ring, a lubricating groove is provided on the surface of the outer ring, and a plurality of lubricating holes communicating with the inside of the bearing body are provided on the lubricating groove. The characteristics are that: the intelligent bearing further includes a sensor group, and the sensor group is arranged in the lubricating holes and / or the lubricating groove.

[0006] Further, the intelligent bearing further includes a flexible annular circuit, and the sensor group transmits bearing parameter information and electric energy through the flexible annular circuit.

[0007] Further, the sensor group includes a thin film vibration sensor, the thin film vibration sensor is arranged in a first lubricating hole, and the substrate of the thin film vibration sensor is arranged parallel to the axial section of the first lubricating hole and forms a simply supported beam in the first lubricating hole.

[0008] Further, the sensor group further includes a temperature and humidity sensor and / or a strain monitoring sensor, and the temperature and humidity sensor and / or the strain monitoring sensor is arranged in any one or any two of a second lubricating hole, a third lubricating hole, and the lubricating groove.

[0009] Furthermore, the thin-film vibration sensor includes a piezoelectric element, a crimp terminal, a flexible film, a polyester substrate, and a mass block. The piezoelectric element is connected to the crimp terminal, and the piezoelectric element and the crimp terminal are disposed above the flexible film. The flexible film is laminated above the polyester substrate, and the mass block is disposed below the polyester substrate and is suspended in the first lubrication hole.

[0010] Furthermore, the temperature and humidity sensor includes a humidity sensing element, a temperature sensing element, a dielectric substrate, and dual in-line flat pins. The humidity sensing element is stacked above the temperature sensing element and has the same shape and size as the temperature sensing element. The temperature sensing element is adhesively bonded to the upper surface of the dielectric substrate, and the dual in-line flat pins are disposed on the lower surface of the dielectric substrate.

[0011] Furthermore, the strain monitoring sensor includes a strain rosette and a strain terminal. The strain rosette is disposed on the strain terminal, and the strain rosette is a triaxial special-shaped strain rosette.

[0012] Furthermore, the intelligent bearing further includes a dust cover. The dust cover is disposed between the inner wall of the outer ring and the outer wall of the inner ring and is fixed to the inner wall of the outer ring. The dust cover axially shields the bearing raceway between the outer ring and the inner ring, and the flexible annular circuit is attached to the inner wall of the dust cover facing the bearing raceway.

[0013] Furthermore, the dust cover further includes a power supply through hole, and an external power supply line and a data acquisition device are connected to the flexible annular circuit in the dust cover through the power supply through hole.

[0014] Furthermore, the flexible annular circuit includes a signal processing circuit and a power supply circuit. The signal processing circuit is used to process bearing parameter information and output it to the data acquisition device, and the power supply circuit is used to supply power to the sensor group.

[0015] The intelligent bearing of the present invention transmits signals through a sensor group installed in areas where the bearing is prone to failure - the lubrication groove and / or the lubrication hole, realizes in-situ monitoring, and monitors the real-time state of temperature, humidity, vibration acceleration, and strain dynamic parameters during the operation of the bearing. The present invention also sets a flexible annular circuit inside the bearing dust cover, maintaining the relative integrity of the bearing structure, effectively reducing the manufacturing and measurement costs, enabling predictive maintenance before a failure occurs, avoiding losses caused by the occurrence of a failure, greatly reducing the signal loss during transmission compared with traditional monitoring methods, and having strong reliability.

[0016] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically given and described in detail in conjunction with the accompanying drawings. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the intelligent bearing provided by the present invention without a dust cover.

[0018] Figure 2 It is a top view of the intelligent bearing provided by the present invention.

[0019] Figure 3 It is a schematic diagram of the inside of the dust cover in the present invention.

[0020] Figure 4 It is a schematic diagram of the thin-film vibration sensor in the present invention.

[0021] Figure 5 It is a top view of the thin-film vibration sensor in the present invention.

[0022] Figure 6 It is a schematic diagram of the temperature and humidity sensor in the present invention.

[0023] Figure 7 It is a top view of the temperature and humidity sensor in the present invention.

[0024] Figure 8 It is a schematic diagram of the strain monitoring sensor in the present invention.

[0025] Figure 9 It is a top view of the strain monitoring sensor in the present invention.

[0026] Figure 10 It is a partial schematic diagram of the thin-film vibration sensor in the present invention. Detailed Description of the Preferred Embodiments

[0027] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the present invention is described in detail as follows in conjunction with the accompanying drawings and preferred embodiments.

[0028] Please refer to Figures 1 to 2 , the intelligent bearing of the present invention includes a bearing body and a sensor group. The bearing body includes an outer ring 11, an inner ring 12, rollers 13 and a bearing raceway 14. Lubrication grooves 3 are provided on the surface of the outer ring 11, and a plurality of lubrication holes 4 communicating with the inside of the bearing body are provided on the lubrication grooves 3. The sensor group is arranged in the lubrication holes 4 and / or the lubrication grooves 3. In this embodiment, the rollers 13 are cylindrical rollers or steel balls.

[0029] Furthermore, the intelligent bearing of the present invention further includes a flexible annular circuit 5 disposed inside the bearing body. The sensor group transmits bearing parameter information and electric energy through the flexible annular circuit 5. In this embodiment, the sensor group, the flexible annular circuit 5, and the flying wires for electrical connection are all subjected to insulation treatment. The present invention uses the flexible annular circuit 5 for data and electric energy transmission, avoiding damage to the original structure of the bearing, maintaining the relative integrity of the bearing structure, and effectively reducing the manufacturing and measurement costs.

[0030] Furthermore, the sensor group of the present invention includes a thin-film vibration sensor 6 for detecting vibration, a temperature and humidity sensor 7 for detecting temperature and humidity, and a strain monitoring sensor 8 for detecting stress. The thin-film vibration sensor 6 is disposed in the first lubrication hole 41 and forms a simply supported beam in the first lubrication hole 41. The temperature and humidity sensor 7 and the strain monitoring sensor 8 are disposed in any one or any two of the second lubrication hole 42, the third lubrication hole 43, and the lubrication groove 3. Please refer specifically to Figure 1 , in this embodiment, the thin-film vibration sensor 6 is disposed at the entrance of the first lubrication hole 41 close to the outer ring 11. The temperature and humidity sensor 7 and the strain monitoring sensor 8 are respectively disposed in the second lubrication hole 42 and the third lubrication hole 43. The first lubrication hole 41 where the thin-film vibration sensor 6 is installed cannot be used for lubricating oil circulation. However, whether the temperature and humidity sensor 7 and / or the strain monitoring sensor 8 are installed in the second lubrication hole 42 and / or the third lubrication hole 43, the second lubrication hole 42 and the third lubrication hole 43 can both be used for lubricating oil circulation. Therefore, there are at least four lubrication holes 4 arranged at a certain angular interval around the lubrication groove 3. In other embodiments, the first lubrication hole 41, the second lubrication hole 42, and the third lubrication hole 43 can be adjacent or opposite to each other. The temperature and humidity sensor 7 and the strain monitoring sensor 8 can be disposed in the second lubrication hole 42 or the third lubrication hole 43 at the same time, or can also be disposed in the lubrication groove 3. The positions and numbers of the lubrication holes 4 can also be adjusted according to the rotational speed and model of the bearing. The present invention directly arranges the sensor group in the area where the bearing is prone to failure, realizes in-situ monitoring, and can perform predictive maintenance before a failure occurs.

[0031] Please refer to together Figures 4 to 5, Further, the thin-film vibration sensor 6 is disposed in the first lubrication hole 41 by means of an adhesive. The substrate of the thin-film vibration sensor 6 is arranged parallel to the axial section of the first lubrication hole 41. The thin-film vibration sensor 6 includes a piezoelectric element 61, a crimp terminal 62, a flexible film 63, a polyester substrate, and a replaceable mass 65. The piezoelectric element 61 is connected to the crimp terminal 62. The piezoelectric element 61 and the crimp terminal 62 are disposed above the flexible film 63. The flexible film 63 is laminated above the polyester substrate. The mass 65 is disposed below the polyester substrate and is suspended in the first lubrication hole 41. In this embodiment, the flexible film 63 is a rectangular thin sheet and is laminated on a polyester substrate with a thickness of 0.125 mm. The piezoelectric element 61 is a silver paste electrode screen-printed on the flexible film 63. The crimp terminal 62 is connected to the piezoelectric element 61 as a lead wire. The mass 65 is vertically disposed in the first lubrication hole 41, and the piezoelectric element 61 always remains parallel to the axial section of the first lubrication hole 41. When designing the product, the mass of the mass 65 and the length of the piezoelectric element 61 can be adjusted and replaced according to the actual situation to obtain the most suitable resonant frequency detection section. The longer the length of the mass 65 in the first lubrication hole 41 or the greater its own mass, the lower the resonant frequency band that the thin-film vibration sensor 6 can sense, and it can generate high sensitivity under low-frequency vibration.

[0032] Please refer to Figures 6 to 7 , Further, the temperature and humidity sensor 7 includes a humidity sensing element 71, a temperature sensing element 72, a dielectric substrate 73, and a dual in-line flat pin 74. The humidity sensing element 71 is stacked above the temperature sensing element 72 and has the same shape and size as the temperature sensing element 72. The temperature sensing element 72 is adhesively bonded to the upper surface of the dielectric substrate 73. The dual in-line flat pin 74 is disposed on the lower surface of the dielectric substrate 73. In this embodiment, the temperature and humidity sensor 7 adopts a temperature and humidity sensing integrated structure in which two sensors are combined into one. The structure is compact and does not affect each other. It simultaneously monitors the bearing temperature and the humidity of its internal environment. By extracting the temperature and humidity signals reflected by the bearing, the temperature and humidity information of the bearing can be further reflected.

[0033] Please refer to Figures 8 to 9 , Further, the strain monitoring sensor includes a strain rosette 81 and a strain terminal 82. The strain rosette 81 is disposed on the strain terminal 82, and the strain rosette 81 is a three-axis special-shaped strain rosette. In this embodiment, the special-shaped strain rosette can simultaneously monitor the stress in multiple directions, thereby further effectively distinguishing the direction of the maximum principal stress, which is of great significance for subsequent bearing diagnosis work.

[0034] Please refer to Figure 3, Further, the intelligent bearing of the present invention further includes a dust cover 2, a first circuit board 9, and a power supply through hole 21 provided on the dust cover 2. The dust cover 2 is provided between the inner wall of the outer ring 11 and the outer wall of the inner ring 12 and fixed to the inner wall of the outer ring 11. The dust cover 2 axially shields the bearing raceway 14 between the outer ring and the inner ring. The first circuit board 9 is fixed to the inner wall of the dust cover 2 facing the bearing raceway 14. The flexible annular circuit 5 is attached to the inner wall of the dust cover 2 facing the bearing raceway 14. The dust cover 2 can effectively prevent dust and other impurities from entering the bearing and affecting the performance of each component, thereby extending the service life of the bearing. The external power supply line and the data acquisition device are connected to the flexible annular circuit 5 in the dust cover 2 through the power supply through hole 21. In this embodiment, the flexible annular circuit 5 is adhered to the inner wall of the dust cover 2 with strong glue, and the first circuit board 9 is also attached to the inner wall of the dust cover 2. The flying wires between the flexible annular circuit 5, the first circuit board 9, the thin film vibration sensor 6, the temperature and humidity sensor 7, and the strain monitoring sensor 8 are along the inside of the dust cover 2 and pass through the lubrication groove 3 and the lubrication hole 4, without contacting the rotating inner ring 12 and the roller 13, maintaining the relative integrity of the overall structure of the bearing and effectively reducing the manufacturing and measurement costs.

[0035] Further, the flexible annular circuit 5 is respectively connected to the sensor group through the first circuit board 9. The flexible annular circuit 5 includes a signal processing circuit and a power supply circuit. The signal processing circuit is used to process the bearing parameter information and output it to the data acquisition device through the power supply interface. The power supply circuit is used to supply power to the first circuit board 9. The first circuit board 9 is electrically connected to the sensor group and the flexible annular circuit 5 respectively. The first circuit board 9 collects the bearing parameter information sent back by the sensor group and supplies power to the sensor group. In this embodiment, the first circuit board 9 is electrically connected to the thin film vibration sensor 6, the temperature and humidity sensor 7, and the strain monitoring sensor 8 respectively, greatly reducing the loss of signals during transmission compared with traditional monitoring methods and having high reliability.

[0036] Specifically, when the intelligent bearing of the present invention is working, the outer ring 11, the dust cover 2, and the inner ring 12 are relatively fixed. The inner ring 12 is connected and positioned with the rotating shaft and rotates at a high speed together with the rotating shaft. The temperature and humidity sensor 7, the thin film vibration sensor 6, and the strain monitoring sensor 8 are connected to the flexible annular circuit 5 through the first circuit board 9. The lines of the external power supply line and the data acquisition device are connected to the first circuit board 9 through the power supply through hole 21 to provide electrical energy for the sensor group. After obtaining electrical energy, the temperature and humidity sensor 7, the thin film vibration sensor 6, and the strain monitoring sensor 8 continuously collect bearing parameter information such as the temperature, humidity, vibration acceleration, and stress change of the bearing respectively and convert them into data, and then transmit them to the data acquisition device through the first circuit board 9, so as to realize the real-time perception and monitoring of the bearing working parameters and health status.

[0037] In summary, the intelligent bearing of the present invention transmits signals through a sensor group installed in the areas where the bearing is prone to failure, namely the lubrication groove and / or the lubrication hole, to achieve in-situ monitoring, and real-time status monitoring of dynamic parameters such as temperature, humidity, vibration acceleration, and strain during the operation of the bearing. The present invention also sets a flexible annular circuit inside the bearing dust cover, maintaining the relative integrity of the bearing structure, effectively reducing the manufacturing and measurement costs, enabling predictive maintenance before a failure occurs, avoiding losses caused by the occurrence of a failure, greatly reducing the loss of signals during transmission compared with traditional monitoring methods, and having strong reliability.

[0038] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the technical content disclosed above within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An intelligent bearing, comprising a bearing body, the bearing body including an outer ring (11) and an inner ring (12), a lubricating groove (3) being provided on the surface of the outer ring (11), and a plurality of lubricating holes (4) communicating with the interior of the bearing body being provided on the lubricating groove (3), characterized in that: The intelligent bearing further includes a sensor group, the sensor group is disposed in the lubricating hole (4) and / or the lubricating groove (3), the intelligent bearing further includes a flexible annular circuit (5), the sensor group transmits bearing parameter information and electric energy through the flexible annular circuit (5), the sensor group includes a thin-film vibration sensor (6), the thin-film vibration sensor (6) is disposed in the first lubricating hole (41), a substrate of the thin-film vibration sensor (6) is arranged parallel to an axial section of the first lubricating hole (41) and forms a simply supported beam in the first lubricating hole (41), the sensor group further includes a temperature and humidity sensor (7) and / or a strain monitoring sensor (8), the temperature and humidity sensor (7) and / or the strain monitoring sensor (8) is disposed in any one or any two of the second lubricating hole (42), the third lubricating hole (43) and the lubricating groove (3), the thin-film vibration sensor (6) includes a piezoelectric element (61), a crimp terminal (62), a flexible film (63), a polyester substrate and a mass block (65), the piezoelectric element (61) is connected to the crimp terminal (62), the piezoelectric element (61) and the crimp terminal (62) are disposed above the flexible film (63), the flexible film (63) is laminated above the polyester substrate, the mass block (65) is disposed below the polyester substrate, the mass block (65) is suspended in the first lubricating hole (41), the thin-film vibration sensor (6) is disposed at an entrance of the first lubricating hole (41) close to the outer ring (11), and the first lubricating hole (41) where the thin-film vibration sensor (6) is installed cannot be used for lubricating oil circulation.

2. The intelligent bearing according to claim 1, wherein: The temperature and humidity sensor (7) includes a humidity sensing element (71), a temperature sensing element (72), a dielectric substrate (73) and a dual in-line flat pin (74), the humidity sensing element (71) is stacked above the temperature sensing element (72) and has the same shape and size as the temperature sensing element (72), the temperature sensing element (72) is adhesively bonded to an upper surface of the dielectric substrate (73), and the dual in-line flat pin (74) is disposed on a lower surface of the dielectric substrate (73).

3. The intelligent bearing according to claim 1, characterized in that: The strain monitoring sensor (8) includes a strain rosette (81) and a strain terminal (82), the strain rosette (81) is disposed on the strain terminal (82), and the strain rosette (81) is a three-axis special-shaped strain rosette.

4. The intelligent bearing according to claim 1, wherein: The intelligent bearing further includes a dust cover (2), the dust cover (2) is disposed between an inner wall of the outer ring (11) and an outer wall of the inner ring (12) and fixed to the inner wall of the outer ring (11), the dust cover (2) axially shields a bearing raceway (14) between the outer ring (11) and the inner ring (12), and the flexible annular circuit (5) is attached to an inner wall of the dust cover (2) facing the bearing raceway (14).

5. The intelligent bearing according to claim 4, wherein: The dust cover (2) further includes a power supply through hole (21), and an external power supply line and a data acquisition device are connected to the flexible annular circuit (5) inside the dust cover (2) through the power supply through hole (21).

6. The intelligent bearing according to claim 5, characterized in that: The flexible annular circuit (5) includes a signal processing circuit and a power supply circuit. The signal processing circuit is used to process bearing parameter information and output it to the data acquisition device, and the power supply circuit is used to supply power to the sensor group.

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