CN111693285A - Portable vibration monitoring device and monitoring method for bearing - Google Patents
Portable vibration monitoring device and monitoring method for bearing Download PDFInfo
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- CN111693285A CN111693285A CN202010767923.5A CN202010767923A CN111693285A CN 111693285 A CN111693285 A CN 111693285A CN 202010767923 A CN202010767923 A CN 202010767923A CN 111693285 A CN111693285 A CN 111693285A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 60
- 238000012806 monitoring device Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001133 acceleration Effects 0.000 claims abstract description 30
- 240000007643 Phytolacca americana Species 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000010248 power generation Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
- G01M13/045—Acoustic or vibration analysis
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
Abstract
The invention provides a portable vibration monitoring device for a bearing and a monitoring method thereof, wherein the portable vibration monitoring device comprises a power generation assembly, a monitoring assembly, a transmission assembly and a display assembly; the power generation assembly comprises an upper plate, a lower plate and a fixed column, and at least one shifting groove is formed in the side wall of the fixed column; the lower plate is provided with at least one through hole, and a poke rod is arranged in the through hole; the poke rod is provided with at least one piezoelectric ceramic piece embedded into the poke groove; the monitoring assembly comprises a rechargeable battery arranged on the upper surface of the upper plate, a signal processing circuit, a microprocessor, a memory and an MEMS acceleration sensor arranged on the lower side of the lower plate; the transmission assembly comprises an NB-IOT module connected with the microprocessor, and the NB-IOT module periodically transmits monitoring data stored in the memory to the monitoring terminal in a message form; the display component comprises a display screen and a tact switch; the self-powered LED lamp has the advantages of convenience in assembly and disassembly, low power consumption and self power supply.
Description
Technical Field
The invention belongs to the technical field of bearing monitoring, and particularly relates to a portable vibration monitoring device for a bearing and a monitoring method thereof.
Background
The mechanical bearing is used as a key part of the rotating machine, and the working state of the mechanical bearing directly influences the working state of the whole mechanical equipment. Rotating machine bearing failure is one of the major causes of failure of rotating machinery, and in severe cases can even result in significant property damage. Therefore, in order to avoid mechanical failure of the bearings by the rotating machinery and reduce economic losses, it is necessary to monitor the condition of the bearings to ensure their proper operation.
The patent mechanical bearing vibration intelligent real-time monitoring system (application number is CN201810745735.5) discloses a mechanical bearing vibration intelligent real-time monitoring system, which comprises a sensing monitoring subsystem for collecting mechanical bearing vibration data, a cloud storage for storing the mechanical bearing vibration data and a display device for displaying the mechanical bearing vibration data; the sensing monitoring subsystem and the display device are connected with the cloud storage.
But the bearing is often integrated with a mechanical bearing for use, is inconvenient to assemble and disassemble and cannot be reused; meanwhile, the power supply of the system is usually realized through a lithium battery or a voltage stabilizing module, and external power supply is needed, so that the system is not favorable for long-time monitoring operation requirements.
Disclosure of Invention
The invention aims to provide a portable vibration monitoring device for a bearing and a monitoring method thereof, which aim to solve the problems that the existing monitoring device cannot be repeatedly used and the cost of an enterprise is increased; meanwhile, the power supply mode is not favorable for long-time monitoring or inconvenient battery replacement.
The invention provides the following technical scheme:
a bearing portable vibration monitoring device and a monitoring method thereof comprise a power generation assembly, a monitoring assembly, a transmission assembly and a display assembly; the power generation assembly comprises an upper plate, a lower plate and a fixing column, wherein the fixing column is connected to the middle parts of the upper plate and the lower plate, and at least one shifting groove is formed in the side wall of the fixing column; the lower plate is at least provided with a through hole, a poke rod is arranged in the through hole, one end of the poke rod is fixed on the upper plate through a spring, and the other end of the poke rod penetrates through the through hole and enters the lower side of the lower plate; the poke rod is provided with at least one piezoelectric ceramic piece embedded into the poke groove; the monitoring assembly comprises a rechargeable battery, a signal processing circuit, a microprocessor, a memory and an MEMS acceleration sensor, wherein the rechargeable battery is arranged on the upper surface of the upper plate, the MEMS acceleration sensor is arranged on the lower side of the lower plate, the input end of the rechargeable battery is connected with the piezoelectric ceramic piece through a lead, the output end of the rechargeable battery is connected with the microprocessor, and the MEMS acceleration sensor is sequentially connected with the signal processing circuit, the microprocessor and the memory; the transmission assembly comprises an NB-IOT module connected with the microprocessor, the NB-IOT module is connected with the monitoring terminal through an NB-IOT wireless routing network, and the NB-IOT module periodically transmits monitoring data stored in the memory to the monitoring terminal in a message form; the display assembly comprises a display screen and a light touch switch, the display screen is connected to the microprocessor and the rechargeable battery, and the light touch switch is arranged between the display assembly and the rechargeable battery.
Preferably, the periphery of the lower plate is respectively provided with a fixing lug, and the fixing lug is used for fixing the power generation assembly on a bearing shell with a bearing arranged inside through a magnet or a fastener.
Preferably, the bearing shell is provided with a blind mounting hole, the MEMS acceleration sensor is fixed in the blind mounting hole, the MEMS acceleration sensor is connected with the signal processing circuit through a wire in a hot plugging manner, and a hot plugging access port of the MEMS acceleration sensor and the signal processing circuit is a Type-C USB Device interface.
Preferably, the monitoring terminal comprises a mobile phone or an industrial control computer.
Preferably, the signal processing circuit includes a filter circuit and an amplifier circuit.
A monitoring method of a portable vibration monitoring device for a bearing comprises the following steps:
s1, an MEMS acceleration sensor arranged on a bearing shell with a bearing arranged inside acquires a vibration signal of the bearing; s2, the signal processing circuit receives the vibration signal, filters and amplifies the vibration signal to generate vibration data, and transmits the vibration data to the microprocessor; and S3, storing the vibration data into a memory by the microprocessor, timing by the internal clock of the microprocessor, and sending the vibration data to the monitoring terminal in a message form through the NB-IOT module when the preset time is reached.
Preferably, the sending of the vibration data to the monitoring terminal in the form of a message by the NB-IOT module includes the microprocessor encoding the vibration data to be sent, generating data to be sent in the form of a data message, and sending the data to be sent in the form of the data message to the monitoring terminal by the NB-IOT module.
The invention has the beneficial effects that:
according to the portable vibration monitoring device and the monitoring method for the bearing, except that the MEMS acceleration sensor which needs to be installed in the bearing shell is arranged independently, other parts are arranged in a centralized manner, and the MEMS acceleration sensor adopts a hot plug connection mode, so that the mounting and the dismounting are convenient; the power generation assembly provides self-power generation work by utilizing the vibration energy of the bearing, avoids the trouble that a battery needs to be replaced or charged in the long-time working process, and keeps the permanent working life; the monitoring assembly, the transmission assembly and the display assembly are all designed with low power consumption, so that insufficient output of the power generation assembly due to excessive power consumption is avoided; possess remote monitoring's ability, the monitoring personnel of being convenient for in time know mechanical bearing vibration information, and the monitoring personnel of being convenient for further analyzes mechanical bearing state according to mechanical bearing vibration information, in time inspects the mechanical bearing that probably breaks down, reduces the loss because of mechanical bearing trouble causes.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall framework of the monitoring device of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the monitoring device of the present invention;
FIG. 3 is a schematic diagram of a MEMS acceleration sensor connection;
FIG. 4 is a schematic diagram of a voltage follower circuit;
FIG. 5 is a schematic flow chart of the method of the present invention.
Detailed Description
As shown in FIG. 1, the portable vibration monitoring device for the bearing comprises a power generation assembly 1, a monitoring assembly, a transmission assembly and a display assembly 2.
As shown in fig. 2, the power generation assembly 1 includes an upper plate 11, a lower plate 12 and a fixing post 13, the fixing post 13 is connected to the middle of the upper plate 11 and the lower plate 12, and at least one toggle groove 14 is arranged on the side wall of the fixing post 13; the lower plate 12 is provided with at least one through hole 15, a poke rod 16 is arranged in the through hole 15, one end of the poke rod 16 is fixed on the upper plate 11 through a spring 17, and the other end of the poke rod 1 penetrates through the through hole 15 and enters the lower side of the lower plate 12; the poke rod 16 is provided with at least one piezoelectric ceramic piece 18 embedded into the poke groove 14; the periphery of the lower plate 12 is respectively provided with a fixing lug 19, and the fixing lug 19 fixes the power generation component 1 on a bearing shell with a bearing arranged inside through a magnet or a fastener; the connection mode of the poke rod 16 and the spring 17, when the installation position is uneven, the spring 17 can automatically level the poke rod 16, and meanwhile, when the poke rod 16 absorbs the vibration of the bearing, the spring 17 can play a buffering role; the power generation assembly 1 is used for supplying power to the monitoring assembly, the transmission assembly and the display assembly 2, reasonably generates power by adopting vibration generated in the working process of the bearing, and does not need external power supply.
The monitoring component comprises a rechargeable battery arranged on the upper surface of the upper plate 11, a signal processing circuit, a microprocessor, a memory and an MEMS acceleration sensor arranged on the lower side of the lower plate 12, wherein the input end of the rechargeable battery is connected with the piezoelectric ceramic piece through a lead, the output end of the rechargeable battery is connected with the microprocessor, and the MEMS acceleration sensor is sequentially connected with the signal processing circuit, the microprocessor and the memory;
the MEMS acceleration sensor adopts ADXL203, and has the characteristics of high precision, low power consumption, single axis/double axis and the like. The measurement range is 1.7g, the performance is best when the supply voltage is 5v, and the sensitivity is 1000 mv/g. In normal operating mode, the ST pin is open or grounded. Capacitors are added to the output of the X axis and the Y axis and the power supply end to play the roles of filtering and denoising, as shown in FIG. 3. The MEMS acceleration sensor is installed in the following mode: be provided with the installation blind hole on the bearing housing, in MEMS acceleration sensor was fixed in the installation blind hole, MEMS acceleration sensor passed through the wire hot plug with signal processing circuit and is connected, and MEMS acceleration sensor is connected for Type-C USB Device interface with signal processing circuit's hot plug access mouth. The hot plug connection mode that here set up is convenient for install and dismantle.
The signal processing circuit comprises a filter circuit and an amplifying circuit, and a large amount of medium-high frequency signals can be mixed in the low-frequency signals in the acquisition process, so that MAX291 is selected for low-pass filtering, and the sampling frequency fc ranges from 0.1Hz to 25 kHz. The clock frequency fosc and the sampling frequency fc have the following relationship:
fc＝fosc/100
where the sampling frequency fc is set to 12kHz, at which time the clock frequency fosc is 1200 kHz.
By calculating Cosc to be 27.8pF, a close reference capacitance of 27pF was chosen. A low-power polarity reversal power supply converter ICL7660 is used for providing-3.3 v voltage for the MAX291 low-pass filter circuit.
In order to reduce the loss in the signal conversion process and increase the input impedance of the vibration signal, a corresponding voltage follower circuit is designed, and an OP07 chip is adopted. The supply voltage of the OP07 chip is 5v, where-5 v is provided by the power converter ICL 7660. The OP07 has the characteristics of low offset and high open loop gain, and is widely applied in the field of testing. The circuit design is shown in fig. 4, and the required amplification factor can be obtained by adjusting R11.
In order to meet the requirement of low power consumption of nodes, an STM32F107 single chip microcomputer is selected for built-in A/D conversion, 12-bit A/D conversion and three working modes: single, continuous, scanning or indirect modes of operation. When the clock frequency of the ADC is set to 56MHz, the conversion time is 1 mus; when the clock frequency of the ADC is set to 72MHz, the conversion time is 1.17 mus. The requirement for acquiring the vibration signal of the bearing is met.
The transmission component comprises an NB-IOT module connected with the microprocessor, the NB-IOT module is connected with the monitoring terminal through an NB-IOT wireless routing network, the NB-IOT module periodically transmits monitoring data stored in the memory to the monitoring terminal in a message form, and the monitoring terminal comprises a mobile phone or an industrial control computer; the NB-IOT module adopts BC95, and BC95 is an NB-IoT wireless communication module with high performance and low power consumption; the regular transmission in the form of messages is different from real-time wireless communication, and the power consumption is further reduced.
The monitoring method of the portable bearing vibration monitoring device comprises the following steps:
s1, an MEMS acceleration sensor arranged on a bearing shell with a bearing arranged inside acquires a vibration signal of the bearing;
s2, the signal processing circuit receives the vibration signal, filters and amplifies the vibration signal to generate vibration data, and transmits the vibration data to the microprocessor;
and S3, storing the vibration data into a memory by the microprocessor, timing by the internal clock of the microprocessor, and sending the vibration data to the monitoring terminal in a message form through the NB-IOT module when the preset time is reached.
The method for sending the vibration data to the monitoring terminal in the form of the message through the NB-IOT module comprises the steps that the microprocessor codes the vibration data to be sent, data to be sent in the form of the data message is generated, and the data to be sent in the form of the data message is sent to the monitoring terminal through the NB-IOT module.
According to the MEMS acceleration sensor, except that the MEMS acceleration sensor which needs to be installed in the bearing shell is arranged independently, other parts are arranged in a centralized mode, and the MEMS acceleration sensor is connected in a hot plug mode, so that the MEMS acceleration sensor is convenient to install and disassemble; the power generation assembly 1 provides self-power generation work by utilizing the vibration energy of the bearing, avoids the trouble that a battery needs to be replaced or charged in the long-time working process, and keeps the permanent working life; the monitoring assembly, the transmission assembly and the display assembly 2 are all designed with low power consumption, so that the output of the power generation assembly 1 is not enough due to excessive power consumption; possess remote monitoring's ability, the monitoring personnel of being convenient for in time know mechanical bearing vibration information, and the monitoring personnel of being convenient for further analyzes mechanical bearing state according to mechanical bearing vibration information, in time inspects the mechanical bearing that probably breaks down, reduces the loss because of mechanical bearing trouble causes.
Labeled as:
1 generating assembly 11 upper plate 12 lower plate 13 fixed column 14 toggle groove 15 through hole 16 toggle rod 17 spring 18 piezoceramics piece 19 fixed ear is taken
2-display unit 21 the display screen 22 taps the switch.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A portable vibration monitoring device for a bearing is characterized by comprising a power generation assembly, a monitoring assembly, a transmission assembly and a display assembly;
the power generation assembly comprises an upper plate, a lower plate and a fixing column, wherein the fixing column is connected to the middle parts of the upper plate and the lower plate, and at least one shifting groove is formed in the side wall of the fixing column; the lower plate is at least provided with a through hole, a poke rod is arranged in the through hole, one end of the poke rod is fixed on the upper plate through a spring, and the other end of the poke rod penetrates through the through hole and enters the lower side of the lower plate; the poke rod is provided with at least one piezoelectric ceramic piece embedded into the poke groove;
the monitoring assembly comprises a rechargeable battery, a signal processing circuit, a microprocessor, a memory and an MEMS acceleration sensor, wherein the rechargeable battery is arranged on the upper surface of the upper plate, the MEMS acceleration sensor is arranged on the lower side of the lower plate, the input end of the rechargeable battery is connected with the piezoelectric ceramic piece through a lead, the output end of the rechargeable battery is connected with the microprocessor, and the MEMS acceleration sensor is sequentially connected with the signal processing circuit, the microprocessor and the memory;
the transmission assembly comprises an NB-IOT module connected with the microprocessor, the NB-IOT module is connected with the monitoring terminal through an NB-IOT wireless routing network, and the NB-IOT module periodically transmits monitoring data stored in the memory to the monitoring terminal in a message form;
the display assembly comprises a display screen and a light touch switch, the display screen is connected to the microprocessor and the rechargeable battery, and the light touch switch is arranged between the display assembly and the rechargeable battery.
2. The portable vibration monitoring device for the bearing of claim 1, wherein the lower plate is provided with fixing lugs at the periphery respectively, and the fixing lugs fix the power generation assembly on the bearing shell with the bearing arranged inside through magnets or fasteners.
3. The portable bearing vibration monitoring Device of claim 2, wherein the bearing housing is provided with blind mounting holes, the MEMS acceleration sensor is fixed in the blind mounting holes, the MEMS acceleration sensor is connected with the signal processing circuit by a wire in a hot plug manner, and a hot plug access port of the MEMS acceleration sensor and the signal processing circuit is a Type-C USB Device interface.
4. A portable vibration monitoring apparatus for a bearing as claimed in claim 1, wherein said monitoring terminal comprises a mobile phone or an industrial computer.
5. A portable vibration monitoring apparatus for a bearing of claim 1, wherein said signal processing circuitry includes filtering circuitry and amplifying circuitry.
6. A monitoring method of a portable vibration monitoring device for a bearing is characterized by comprising the following steps:
s1, an MEMS acceleration sensor arranged on a bearing shell with a bearing arranged inside acquires a vibration signal of the bearing;
s2, the signal processing circuit receives the vibration signal, filters and amplifies the vibration signal to generate vibration data, and transmits the vibration data to the microprocessor;
and S3, storing the vibration data into a memory by the microprocessor, timing by the internal clock of the microprocessor, and sending the vibration data to the monitoring terminal in a message form through the NB-IOT module when the preset time is reached.
7. The monitoring method of a portable vibration monitoring device for a bearing of claim 6, wherein the sending of the vibration data to the monitoring terminal in the form of a message through the NB-IOT module comprises the microprocessor encoding the vibration data to be sent, generating data to be sent in the form of a data message, and sending the data to be sent in the form of the data message to the monitoring terminal through the NB-IOT module.
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| CN202010767923.5A CN111693285A (en) | 2020-08-03 | 2020-08-03 | Portable vibration monitoring device and monitoring method for bearing |
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| CN202010767923.5A CN111693285A (en) | 2020-08-03 | 2020-08-03 | Portable vibration monitoring device and monitoring method for bearing |
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| CN113740065A (en) * | 2021-09-07 | 2021-12-03 | 南通理工学院 | Wireless vibration monitoring device and method for radial sliding bearing |
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