Bearing device with health monitoring function

Abstract

The invention discloses a bearing device with a health monitoring function, the bearing device comprises a bearing body and a detection module, the bearing body comprises an inner ring, an outer ring arranged outside the inner ring in a sleeving manner, and a rolling part arranged between the inner ring and the outer ring, the outer ring is a fixed ring, the inner ring is a rotating ring, and the detection module is arranged between the inner ring and the outer ring. The detection module comprises an annular reference part which sleeves the outer peripheral surface of the inner ring and is fixed with the inner ring, and the outer peripheral surface of the annular reference part is provided with a circumferential reference surface and a conical reference surface which are radially outward; the measuring unit is arranged in the outer ring in the radial direction, and the head of the measuring unit faces the peripheral face of the annular reference part in the radial direction. The measuring unit detects the radial runout amount of the inner ring based on the cylindrical reference surface, and the measuring unit detects the axial displacement amount of the inner ring based on the conical reference surface.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission equipment, and in particular to a bearing device with a health monitoring function. Background Art

[0002] If the relevant parts of the bearing (such as the inner ring, outer ring, and rollers) suffer from excessive wear, cracking, and other health problems due to the use environment or service life, it will seriously affect the operation of the transmission system and may even be fatal to the transmission system.

[0003] In the past, the health status of bearings was regularly checked offline (the bearings needed to be disassembled, so the transmission system needed to be shut down for checking the bearings) to detect health problems of the bearings in advance. However, it is well known that the defects of the offline bearing detection method are: too low a detection frequency may cause bearing damage to occur long before the detection, and too high a detection frequency will cause the transmission system to shut down frequently, affecting the operating efficiency of the transmission system.

[0004] At present, for bearings in important transmission systems, online monitoring of the health of the bearings is usually adopted to overcome the defects of offline detection methods. Specifically, transmission systems usually use bearings with online monitoring functions. Such bearings usually have a measuring unit added to the bearing body. The measuring unit evaluates the health status of the bearing body by checking the radial runout and axial play of the inner ring (or outer ring) of the bearing body.

[0005] However, the typical defects of bearings with online monitoring function in the prior art are: 1. The measuring unit usually includes at least a first sensor and a second sensor. The first sensor needs to be arranged radially so that its head is radially facing the cylindrical surface of the inner ring (or outer ring), so as to detect the radial runout of the inner ring. The second sensor needs to be arranged axially and needs to be arranged outside the end face of the inner ring so that its head is axially facing the end face of the inner ring, so as to detect the axial runout of the inner ring. The different arrangement directions of the two sensors result in the bearing body needing to configure a larger installation space for the measuring unit, which makes it difficult to miniaturize the bearing and affects assembly.

[0006] 2. The current measurement units of bearings with online monitoring functions are not capable of directly detecting cracks in the inner ring (outer ring) of the bearing body. Most of them only indirectly judge cracks through radial runout or axial movement, with poor accuracy. However, cracks in the bearing body are serious faults of the bearing. Summary of the invention

[0007] In view of the above technical problems existing in the prior art, the present invention provides a bearing device with a health monitoring function.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: A bearing device with a health monitoring function, the bearing device comprising a bearing body and a detection module, the bearing body comprising an inner ring, an outer ring sleeved outside the inner ring, and a rolling component arranged between the inner ring and the outer ring, the outer ring being a fixed ring, the inner ring being a rotating ring, and the detection module comprising: An annular reference component is sleeved on the outer circumferential surface of the inner ring and fixed to the inner ring, and a circumferential reference surface and a conical reference surface facing radially outward are arranged on the outer circumferential surface of the annular reference component; A measuring unit is radially arranged in the outer ring, the head of the measuring unit is radially toward the outer peripheral surface of the annular reference component, the measuring unit detects the radial runout of the inner ring based on the cylindrical reference surface, and the measuring unit detects the axial runout of the inner ring based on the conical reference surface.

[0009] Preferably, The cylindrical reference surface includes a first cylindrical reference surface; The measuring unit comprises: a contact head, a detection column, a rigid column, a compression spring and a pressure-variable resistor; the contact head, the detection column, the rigid column, the compression spring and the pressure-variable resistor are arranged in sequence from the radial inner side to the radial outer side of the bearing body; the two ends of the detection column are respectively connected to the contact head and the rigid column; wherein: An annular groove is provided on the outer circumferential surface of the annular reference component; the bottom of the annular groove serves as the first cylindrical reference surface, the inclined groove walls on both sides of the annular groove serve as the conical reference surfaces, and the head of the contact head is opposite to and in contact with the first circumferential reference surface; The detection column is provided with U-shaped grooves extending inwardly on both sides of the bearing body in the axial direction, one of the groove walls of the U-shaped groove on each side is provided with two contacts, and the other groove wall is provided with a conductive strip; If the inner ring generates radial runout, the first cylindrical reference surface generates radial displacement along with the radial runout of the inner ring to change the radial force on the contact head, the piezoresistor sends electrical signals of different strengths in response to the change of the radial force, and the radial runout of the inner ring is obtained based on the strength of the electrical signal to determine whether the radial runout exceeds the maximum allowable radial runout; If the inner ring produces axial movement and the axial movement exceeds the maximum allowable axial movement, the head of the contact head slides onto the conical reference surface, and the conical reference surface brings the two groove walls of the U-shaped groove of the detection column on one side of the movement direction close to each other so that the contact contacts the conductive strip, thereby making the two contacts electrically conductive. Therefore, based on the on-off state of the two contacts, it is determined whether the axial movement of the inner ring exceeds the maximum allowable axial movement.

[0010] Preferably, The cylindrical reference surface includes a second cylindrical reference surface; An annular groove is provided on the outer circumferential surface of the annular reference component, and the inclined groove walls on both sides of the groove bottom of the annular groove serve as the conical reference surface; The annular groove is filled with a sound-conducting layer that allows ultrasonic waves to pass through, and the outer peripheral surface of the sound-conducting layer serves as the second cylindrical reference surface; The measuring unit comprises a light sensor and an ultrasonic sensor; the light sensor and the ultrasonic sensor are both radially arranged in the outer ring and facing the outer peripheral surface of the annular reference component; wherein: The optical sensor obtains the radial runout of the inner ring based on measuring the radial displacement of the second circumferential reference surface and determines whether the radial runout is greater than the maximum allowable radial runout; The ultrasonic sensor obtains the axial movement of the inner ring by measuring the change in the radial dimension of the conical reference surface relative to the emitting port of the ultrasonic sensor caused by the axial movement of the inner ring, and determines whether the axial movement exceeds the maximum allowable axial movement.

[0011] Preferably, the detection module also includes a signal processing unit, a signal wireless transmission unit and a power storage unit at least for providing power to the signal processing unit and the signal wireless transmission unit; the signal processing unit, the signal wireless transmission unit and the power storage unit are all arranged in the outer ring.

[0012] Preferably, the detection module also includes a first transducer; the first transducer includes a first permanent magnet and a first coil; the first coil is arranged on the inner wall of the outer ring, and the first permanent magnet is arranged on the outer peripheral surface of the inner ring and opposite to the first coil; both ends of the wire of the first coil are connected to the power storage unit.

[0013] Preferably, the detection module further includes a second transducer and a crack detection unit; The second transducer comprises a second permanent magnet and a second coil; the second coil is arranged on the outer circumference of the inner ring, and the second permanent magnet is arranged on the inner wall of the outer ring and opposite to the second coil; The crack detection unit includes an insulating bottom layer extending circumferentially along the outer circumference of the inner ring and a conductive layer laid along the insulating bottom layer. The guide layer has an opening to form two connection ends, and the two ends of the conductor of the second coil are electrically connected to the two connection ends respectively.

[0014] Preferably, the insulating bottom layer is made of silicon-based material; and the conductive layer is formed by laying silver powder.

[0015] Preferably, the rolling component comprises a cage and two rows of cylindrical rollers arranged on the cage; and the measuring unit is arranged in a region between the two cylindrical rollers.

[0016] Preferably, the inner ring is formed by butting two sleeves.

[0017] Preferably, the signal processing unit, the signal wireless transmission unit and the power storage unit are integrated in a sealed casing.

[0018] Compared with the prior art, the bearing device with health monitoring function disclosed in the present invention has the following beneficial effects: The technical solution provided by the present invention can not only meet the requirements of online monitoring of the health status of the bearing, but also realize the miniaturization design of the bearing device.

[0019] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

[0020] This summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments of the invention. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0022] Figure 1 A main cross-sectional view of a bearing device with a health monitoring function provided by an embodiment of the present invention.

[0023] Figure 2 A left side view of a bearing device with a health monitoring function provided by an embodiment of the present invention.

[0024] Figure 3 for Figure 1 An enlarged view of detail A of the measuring unit (the measuring unit is of the first type and the axial movement of the inner ring is less than the maximum allowable axial movement).

[0025] Figure 4 for Figure 1An enlarged view of detail A of the measuring unit (the measuring unit is of the first type and the axial movement of the inner ring exceeds the maximum allowable axial movement).

[0026] Figure 5 for Figure 1 An enlarged view of detail A of the measuring unit (the measuring unit is of the second type and the axial play of the inner ring is less than the maximum allowable axial play).

[0027] Figure 6 for Figure 1 An enlarged view of detail A of the measuring unit (the measuring unit is of the second type and the axial play of the inner ring exceeds the maximum permissible axial play).

[0028] Reference numerals: 10-bearing body; 11-outer ring; 12-inner ring; 13-rolling part; 131-cylindrical roller; 132-cage; 20-detection module; 21-annular reference part; 211-first cylindrical reference surface; 212-second cylindrical reference surface; 213-conical reference surface; 214-sound-conducting layer; 22-measuring unit; 221-contact head; 222-detection column; 2221-U-shaped groove; 2222-contact point; 2223-conductive strip; 223-rigid body Column; 224-compression spring; 225-piezoresistance; 226-pressure cover; 227-optical sensor; 228-ultrasonic sensor; 23-first transducer; 231-first coil; 232-first permanent magnet; 24-second transducer; 241-second coil; 242-second permanent magnet; 25-crack detection unit; 251-conductive layer; 252-insulating bottom layer; 261-power storage unit; 262-signal processing unit; 263-signal wireless transmission unit. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and well-known components are omitted.

[0032] like Figures 1 to 6 As shown, an embodiment of the present invention discloses a bearing device with a health monitoring function, which is preferably used in important transmission systems, but is not limited to being used in such transmission systems. The bearing device includes: a bearing body 10 and a detection module 20.

[0033] The bearing body 10 includes an outer ring 11, an inner ring 12 and a rolling member 13; the outer ring 11 is sleeved outside the inner ring 12, the rolling member 13 is arranged between the outer ring 11 and the inner ring 12, and the rolling member 13 includes a retainer 132 and two rows of cylindrical rollers 131 arranged on the retainer 132; the two rows of cylindrical rollers 131 simultaneously form a rolling fit with the inner wall of the outer ring 11 and the outer circumferential surface of the inner ring 12, so that the outer ring 11 and the inner ring 12 rotate relative to each other. In the present invention, the outer ring 11 is placed in the bearing seat, and the inner hole of the inner ring 12 is inserted by the end of the rotating shaft, so that the outer ring 11 serves as a fixed ring and the inner ring 12 serves as a rotating ring. The detection module 20 is used to measure and detect the relevant parameters of the inner ring 12, such as radial runout and axial runout.

[0034] The detection module 20 is placed inside the bearing body 10, specifically in the area between the two rows of cylindrical rollers 131. The detection module 20 includes: a measuring unit 22, an annular reference component 21, a power storage unit 261, a signal processing unit 262, a signal wireless transmission unit 263, a first transducer 23, a second transducer 24, and a crack detection unit 25. The power storage unit 261, such as a battery, is used to power the electrical components in the detection module 20, for example, the measuring unit 22, the signal processing unit 262, and the signal wireless transmission unit 263. The first transducer 23 is used to convert part of the mechanical energy of the inner ring 12 into electrical energy to provide to the power storage unit 261. In this way, the detection module 20 does not need to be electrically connected to an external power source through a wire, which is conducive to the assembly of the bearing device and simplifies the power distribution system of the transmission system.

[0035] The measuring unit 22 is used to measure the radial runout and axial movement of the inner ring 12, and send these parameters to the signal processing unit 262 in the form of electrical signals. The signal processing unit 262 processes the electrical signal from the measuring unit 22 and sends it to an external monitoring platform through the signal wireless transmission unit 263 to display the radial runout and axial movement of the inner ring 12; the crack detection unit 25 cooperates with the second transducer 24 to detect whether cracks occur in the inner ring 12, and sends the crack situation to the signal processing unit 262 in the form of electrical signals. The signal processing unit 262 processes the electrical signal and sends it to the monitoring platform through the signal wireless transmission unit 263.

[0036] A key point of the present invention is: using the measuring unit 22 in conjunction with the annular reference component 21 to measure the radial runout and axial runout of the inner ring 12. Specifically, the annular reference component 21 is fixedly sleeved on the outer circumference of the inner ring 12 between the two rows of cylindrical rollers 131, the measuring unit 22 is radially arranged in the radial mounting hole of the outer ring 11, and the head (measuring head) of the measuring unit 22 is radially facing the outer circumference of the annular reference component 21; the outer circumference of the annular reference component 21 is provided with a cylindrical reference surface and a conical reference surface 213 adjacent to the cylindrical reference surface, and in the initial state, the head of the measuring unit 22 is opposite to the cylindrical reference surface. The measuring unit 22 detects the radial runout of the inner ring 12 based on the cylindrical reference surface, and the measuring unit 22 detects the axial runout of the inner ring 12 based on the conical reference surface 213, that is, when the inner ring 12 has radial runout, the cylindrical reference surface produces radial runout along with the inner ring 12, and the measuring unit 22 can generate an electrical signal in response to the radial runout of the cylindrical reference surface in a contact or non-contact manner, and generate electrical signals of different strengths based on the size of the radial runout; since the conical reference surface 213 is configured, the axial runout of the inner ring 12 can be sensed by the measuring unit 22 through the conical reference surface 213, that is, the measuring unit 22 can generate an electrical signal in response to the axial runout through the conical reference surface 213 in a contact or non-contact manner, thereby monitoring the axial runout of the inner ring 12. Therefore, by setting a conical reference surface 213 on the outer circumferential surface of the inner ring 12, the measuring unit 22 can obtain the change of the axial movement of the inner ring 12 in a radial direction, thereby avoiding the axial arrangement of the measuring component at the end of the inner ring 12, so that the bearing device provided by the present invention can be miniaturized and easy to assemble with the bearing seat, rotating shaft and other components.

[0037] The present invention provides two types of measuring units 22 .

[0038] A first type of measuring unit 22 .

[0039] like Figure 3 , 4 Combined with Figure 1As shown, this type of measuring unit 22 uses a contact method to detect the radial runout and axial movement of the inner ring 12. Specifically, the measuring unit 22 includes a contact head 221, a detection column 222, a rigid column 223, a compression spring 224, a varistor 225 and a pressure cover 226. The contact head 221, the detection column 222, the rigid column 223, the compression spring 224, the varistor 225 and the pressure cover 226 are arranged in sequence from the radial inner side to the radial outer side of the bearing body 10. A part of the rigid column 223, the compression spring 224, the varistor 225 and the pressure cover 226 are basically located in the radial mounting hole of the outer ring 11. The contact head 221, the detection column 222 , and another part of the rigid column 223 protrudes from the inner wall of the outer ring 11; the contact head 221 contacts the outer peripheral surface of the annular reference component 21, and is subjected to the radial force of the inner ring 12 in the radial direction outward, and the radial force is transmitted to the piezoresistance 225 through the detection column 222, the rigid column 223, and the compression spring 224, so that the piezoresistance 225 generates an electrical signal, and the electrical signal is processed by the signal processing unit 262 and sent to the monitoring platform through the signal wireless transmission unit 263; the two ends of the detection column 222 are respectively connected to the rigid column 223 and the contact head 221. The contact 221 is butted and fixed, and the detection column 222 is located on both sides of the bearing body 10 in the axial direction and has U-shaped grooves 2221 extending inwardly. The groove wall of the U-shaped groove 2221 on each side close to the rigid column 223 is arranged with a contact point 2222, and the groove wall close to the contact head 221 is arranged with a conductive strip 2223. The U-shaped grooves 2221 on both sides enable the contact head 221 to swing when subjected to lateral force (the lateral force is in the axial direction of the bearing body 10), and when the contact head 221 swings, the lateral force causes the two U-shaped grooves 2221 on one side to swing. The groove walls are close to each other, so that the two contacts 2222 on this side are in contact with the conductive strip 2223 at the same time, so that the two contacts 2222 are electrically conductive, while the two groove walls of the U-shaped groove 2221 on the other side are far away from each other. When the contact 2222 is conductive with the conductive strip 2223, the electrical signal processing unit 262 can obtain the conductive electrical signal and send the electrical signal to the monitoring platform through the signal wireless transmission unit 263. The monitoring platform obtains the degree that the contact head 221 has swung to make the contact 2222 contact with the conductive strip 2223 through this signal.

[0040] The cylindrical reference surface includes a first cylindrical reference surface 211. An annular groove with a trapezoidal cross section is provided on the outer circumference of the annular reference component 21. The bottom of the annular groove serves as the first cylindrical reference surface 211, and the inclined groove walls on both sides of the bottom of the annular groove serve as conical reference surfaces 213. In the initial state, the contact head 221 of the measuring unit 22 is opposite to and in contact with the first cylindrical reference surface 211.

[0041] like Figure 3As shown, when the inner ring 12 generates radial runout, the first cylindrical reference surface 211 generates radial runout along with the inner ring 12, and the radial force of the first cylindrical reference surface 211 on the contact head 221 increases with the increase of the runout amount. The radial force is transmitted to the variator 225 through the detection column 222, the rigid column 223, and the compression spring 224. The resistance of the variator 225 decreases with the increase of the radial force, so that the generated electrical signal (current signal) increases with the increase of the radial force, so that a mapping relationship is formed between the radial runout amount and the strength of the electrical signal, and thus, the electrical signal strength corresponding to the maximum allowable radial runout amount of the inner ring 12 is determined based on the mapping relationship. If the monitoring platform monitors that the electrical signal strength exceeds the allowable strength, it is determined that the radial runout amount of the inner ring 12 exceeds the maximum allowable radial runout amount, thereby giving a warning or alarm to the health status of the bearing in terms of radial runout.

[0042] like Figure 4 As shown, when the inner ring 12 produces axial movement and the axial movement reaches a certain amount, the axial movement of the inner ring 12 causes the head of the contact head 221 to slide onto the conical reference surface 213 on the opposite side of the axial movement direction. The conical reference surface 213 has an inclined generatrix and generates a lateral force on the contact head 221. The lateral force causes the contact head 221 to swing and drives the two groove walls of the U-shaped groove 2221 on one side of the movement direction of the detection column 222 to approach each other. If the axial movement exceeds the maximum allowable axial movement, the contact head 221 swings to the extent that the contacts 2222 on the two groove walls contact the conductive strip 2223, thereby generating an electrical signal to the monitoring platform through the signal wireless transmission unit 263. The monitoring platform detects the electrical signal and issues a warning or alarm on the health status of the bearing in terms of the axial movement.

[0043] It should be noted that the axial dimension of the first cylindrical reference surface 211 and the cone angle of the conical reference surface 213 can be set according to the maximum allowable axial movement to ensure that when the inner ring 12 has an axial movement exceeding the maximum allowable axial movement, the contact head 221 has slid onto the conical reference surface 213 and can force the contact head 221 to swing to the extent that the contact point 2222 on the groove wall of the U-shaped groove 2221 contacts the conductive strip 2223.

[0044] The use of the above-mentioned type of measuring unit 22 to monitor the health status of the bearing in terms of radial runout and axial play by contact has the advantage of accurate monitoring and can avoid interference from media such as lubricating oil.

[0045] A measuring unit 22 of the second type.

[0046] like Figure 5 and Figure 6As shown, this type of measuring unit 22 detects the radial runout and axial runout of the inner ring 12 in a non-contact manner. Specifically, the measuring unit 22 includes an optical sensor 227 (such as an infrared sensor) and an ultrasonic sensor 228, both of which are radially arranged in the outer ring 11 and face the outer peripheral surface of the annular reference component 21.

[0047] The cylindrical reference surface includes a second circumferential reference surface; an annular groove with a trapezoidal cross-section is provided on the outer circumferential surface of the annular reference component 21, and the inclined groove walls on both sides of the groove bottom of the annular groove serve as a conical reference surface 213. The annular groove is filled with a sound-conducting layer 214 that allows ultrasonic waves to pass through. The outer circumferential surface of the sound-conducting layer 214 is flush with the outer circumferential surface of the inner ring 12, and the outer circumferential surface of the sound-conducting layer 214 is covered with a light reflecting layer. The outer circumferential surface of the sound-conducting layer 214 serves as the second cylindrical reference surface 212.

[0048] like Figure 5 As shown, when the inner ring 12 generates radial runout, the second cylindrical reference surface 212 generates radial runout along with the inner ring 12, and the emission and reflection distances of the light waves emitted by the optical sensor 227 to the second cylindrical reference surface 212 change, so that the optical sensor 227 sends electrical signals of different strengths to the signal processing unit 262. For example, the larger the radial runout, the smaller the distance between the second cylindrical reference surface 212 and the optical sensor 227, and the stronger the electrical signal sent by the optical sensor 227, so that a mapping relationship is formed between the radial runout and the strength of the electrical signal. Therefore, based on the mapping relationship, the electrical signal strength corresponding to the maximum allowable radial runout of the inner ring 12 is determined. If the monitoring platform monitors that the electrical signal strength exceeds the allowable strength, it is determined that the radial runout of the inner ring 12 exceeds the maximum allowable radial runout, thereby issuing a warning or alarm for the health status of the bearing in terms of radial runout.

[0049] like Figure 6As shown, when the inner ring 12 generates axial movement, and the axial movement reaches a certain amount, the movement of the inner ring 12 causes the conical reference surface 213 to pass through the emission port of the ultrasonic sensor 228, and the ultrasonic wave emitted from the emission port passes through the sound-conducting layer 214 and reaches the conical reference surface 213, so that the radial size of the axial position of the circumferential reference surface corresponding to the emission port or the distance from the emission port can be measured. The larger the axial movement, the larger the radial size of the axial position of the conical reference surface 213 corresponding to the emission port or the smaller the distance from the emission port, the stronger the electrical signal generated by the ultrasonic wave. Therefore, the strength of the electrical signal sent by the ultrasonic sensor 228 forms a mapping relationship with the axial movement of the inner ring 12. Therefore, based on the mapping relationship, the electrical signal strength corresponding to the maximum allowable axial movement of the inner ring 12 is determined. If the monitoring platform monitors that the electrical signal strength exceeds the allowable strength, it is determined that the radial runout of the inner ring 12 exceeds the maximum allowable axial movement, thereby giving a warning or alarm for the health status of the bearing in terms of axial movement.

[0050] The use of the above-mentioned type of measuring unit 22 can avoid detecting the health status of the bearing through contact, thereby avoiding wear caused by contact.

[0051] In some preferred embodiments, the power storage unit 261 , the signal processing unit 262 and the signal wireless transmission unit 263 in the detection module 20 are centrally installed in a sealed shell, and the shell is fixed in a radial mounting hole at the rear of the measuring unit 22 .

[0052] The first transducer 23 specifically includes a first coil 231 and a first permanent magnet 232; the first coil 231 is arranged on the inner wall of the outer ring 11 and extends along the circumferential direction for a section, the first permanent magnet 232 is arranged on the outer peripheral surface of the inner ring 12 and extends along the circumferential direction for a section and is opposite to the first coil 231, and both ends of the wire of the first coil 231 are connected to the power storage unit 261. In this way, when the inner ring 12 rotates relative to the outer ring 11, the electromagnetic effect of the first permanent magnet 232 and the first coil 231 causes the wire of the first coil 231 to generate current for charging the power storage unit 261.

[0053] like Figure 3 Combined with Figure 1As shown, the second transducer 24 is used in conjunction with the crack detection unit 25. Specifically, the second transducer 24 includes a second coil 241 and a second permanent magnet 242. The second coil 241 is arranged on the outer circumferential surface of the inner ring 12 and extends for a section in the circumferential direction. The second permanent magnet 242 is arranged on the inner wall of the outer ring 11 and extends for a section in the circumferential direction and is opposite to the second coil 241. In addition, a Hall sensor for detecting the strength and direction of the magnetic field is provided on one side of the second coil 241. The crack detection unit 25 includes an insulating bottom layer 252 extending for a section in the circumferential direction along the outer circumferential surface of the inner ring 12 and a conductive layer 251 laid along the insulating bottom layer 252. The guide layer has an opening to form two connection ends. The two ends of the wire of the second coil 241 are electrically connected to the two connection ends respectively. When the inner ring 12 rotates relative to the outer ring 11, the electromagnetic effect of the first permanent magnet 232 and the first coil 231 causes the wire of the first coil 231 to generate current, and the current passes through the conductive layer 251. If the inner ring 12 is cracked, the expansion of the inner ring 12 due to the crack causes the conductive layer 251 to break, thereby causing the conductive layer 251 to be disconnected. At this time, the magnetic field strength detected by the Hall sensor is different from the magnetic field strength when the conductive layer 251 maintains a passage, so that the Hall sensor generates different electrical signals, and the monitoring platform determines whether the inner ring 12 is cracked based on different electrical signals. This structure for detecting cracks is simple and takes up almost no space. Preferably, the insulating bottom layer 252 is made of silicon-based material; the conductive layer 251 is paved with silver powder, so that the insulating bottom layer 252 has higher brittleness and lower elastic-plastic deformation ability, so that it is easier to break in response to the cracking of the inner ring 12; the conductive layer 251 has higher brittleness and lower elastic-plastic deformation ability, so that it is easier to break in response to the cracking of the inner ring 12.

[0054] In addition, although exemplary embodiments have been described in the present invention, the scope includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims will be interpreted broadly based on the language adopted in the claims, and are not limited to the examples described in this specification or during the execution of this application, and the examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0055] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more schemes thereof) may be used in combination with each other. For example, a person of ordinary skill in the art may use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features may be grouped together to simplify the present invention. This should not be interpreted as an intention that a disclosed feature that is not required to be protected is necessary for any claim. On the contrary, the subject matter of the present invention may be less than all the features of a particular disclosed embodiment. Thus, the following claims are incorporated herein as examples or embodiments in the specific embodiments, wherein each claim is independently a separate embodiment, and it is considered that these embodiments can be combined with each other in various combinations or arrangements. The scope of the present invention should be determined with reference to the appended claims and the full scope of equivalent forms granted by these claims.

[0056] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A bearing device with a health monitoring function, the bearing device comprising a bearing body and a detection module, the bearing body comprising an inner ring, an outer ring sleeved outside the inner ring, and a rolling component arranged between the inner ring and the outer ring, the outer ring being a fixed ring, and the inner ring being a rotating ring, characterized in that: The detection module comprises: An annular reference component is sleeved on the outer circumferential surface of the inner ring and fixed to the inner ring, and a circumferential reference surface and a conical reference surface facing radially outward are arranged on the outer circumferential surface of the annular reference component; A measuring unit is radially arranged in the outer ring, the head of the measuring unit is radially toward the outer peripheral surface of the annular reference component, the measuring unit detects the radial runout of the inner ring based on the cylindrical reference surface, and the measuring unit detects the axial runout of the inner ring based on the conical reference surface.

2. The bearing device with health monitoring function according to claim 1, characterized in that: The cylindrical reference surface includes a first cylindrical reference surface; The measuring unit comprises: a contact head, a detection column, a rigid column, a compression spring and a pressure-variable resistor; the contact head, the detection column, the rigid column, the compression spring and the pressure-variable resistor are arranged in sequence from the radial inner side to the radial outer side of the bearing body; the two ends of the detection column are respectively connected to the contact head and the rigid column; wherein: An annular groove is provided on the outer circumferential surface of the annular reference component; the bottom of the annular groove serves as the first cylindrical reference surface, the inclined groove walls on both sides of the annular groove serve as the conical reference surfaces, and the head of the contact head is opposite to and in contact with the first circumferential reference surface; The detection column is provided with U-shaped grooves extending inwardly on both sides of the bearing body in the axial direction, one of the groove walls of the U-shaped groove on each side is provided with two contacts, and the other groove wall is provided with a conductive strip; If the inner ring generates radial runout, the first cylindrical reference surface generates radial displacement along with the radial runout of the inner ring to change the radial force on the contact head, the piezoresistor sends electrical signals of different strengths in response to the change of the radial force, and the radial runout of the inner ring is obtained based on the strength of the electrical signal to determine whether the radial runout exceeds the maximum allowable radial runout; If the inner ring produces axial movement and the axial movement exceeds the maximum allowable axial movement, the head of the contact head slides onto the conical reference surface, and the conical reference surface brings the two groove walls of the U-shaped groove of the detection column on one side of the movement direction close to each other so that the contact contacts the conductive strip, thereby making the two contacts electrically conductive. Therefore, based on the on-off state of the two contacts, it is determined whether the axial movement of the inner ring exceeds the maximum allowable axial movement.

3. The bearing device with health monitoring function according to claim 1, characterized in that: The cylindrical reference surface includes a second cylindrical reference surface; An annular groove is provided on the outer circumferential surface of the annular reference component, and the inclined groove walls on both sides of the groove bottom of the annular groove serve as the conical reference surface; The annular groove is filled with a sound-conducting layer that allows ultrasonic waves to pass through, and the outer peripheral surface of the sound-conducting layer serves as the second cylindrical reference surface; The measuring unit comprises a light sensor and an ultrasonic sensor; the light sensor and the ultrasonic sensor are both radially arranged in the outer ring and facing the outer peripheral surface of the annular reference component; wherein: The optical sensor obtains the radial runout of the inner ring based on measuring the radial displacement of the second circumferential reference surface and determines whether the radial runout is greater than the maximum allowable radial runout; The ultrasonic sensor obtains the axial movement of the inner ring by measuring the change in the radial dimension of the conical reference surface relative to the emitting port of the ultrasonic sensor caused by the axial movement of the inner ring, and determines whether the axial movement exceeds the maximum allowable axial movement.

4. The bearing device with health monitoring function according to claim 2 or 3, characterized in that: The detection module also includes a signal processing unit, a signal wireless transmission unit and a power storage unit at least for providing power to the signal processing unit and the signal wireless transmission unit; the signal processing unit, the signal wireless transmission unit and the power storage unit are all arranged in the outer ring.

5. The bearing device with health monitoring function according to claim 4, characterized in that: The detection module also includes a first transducer; the first transducer includes a first permanent magnet and a first coil; the first coil is arranged on the inner wall of the outer ring, and the first permanent magnet is arranged on the outer peripheral surface of the inner ring and opposite to the first coil; both ends of the wire of the first coil are connected to the power storage unit.

6. The bearing device with health monitoring function according to claim 5, characterized in that: The detection module shown also includes a second transducer and a crack detection unit; The second transducer comprises a second permanent magnet and a second coil; the second coil is arranged on the outer circumference of the inner ring, and the second permanent magnet is arranged on the inner wall of the outer ring and opposite to the second coil; The crack detection unit includes an insulating bottom layer extending circumferentially along the outer circumference of the inner ring and a conductive layer laid along the insulating bottom layer. The guide layer has an opening to form two connection ends, and the two ends of the conductor of the second coil are electrically connected to the two connection ends respectively.

7. The bearing device with health monitoring function according to claim 6, characterized in that: The insulating bottom layer is made of silicon-based material; the conductive layer is paved with silver powder.

8. The bearing device with health monitoring function according to claim 1, characterized in that: The rolling component comprises a cage and two rows of cylindrical rollers arranged on the cage; the measuring unit is arranged in a region between the two cylindrical rollers.

9. The bearing device with health monitoring function according to claim 1, characterized in that: The inner ring is formed by butting two sleeves.

10. The bearing device with health monitoring function according to claim 4, characterized in that: The signal processing unit, the signal wireless transmission unit and the power storage unit are integrated in a sealed shell.

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