Portable rolling bearing vibration waveform acquisition device
By designing a portable rolling bearing vibration waveform acquisition device, using components such as ICP acceleration sensors and microcontrollers, the existing data acquisition is expensive and inconvenient, and portable and efficient data acquisition and fault diagnosis are achieved.
Patent Information
- Application Number
- CN202421841850.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-31
AI Technical Summary
Existing data acquisition cards are expensive and inconvenient to portable use, making them difficult to meet the needs of vibration waveform acquisition for portable rolling bearings.
A portable rolling bearing vibration waveform acquisition device is designed, using ICP acceleration sensor, constant current source power supply circuit, signal conditioning circuit, ADC voltage conditioning circuit, microcontroller and display module, with high integration, simplified circuit structure and reduced costs.
It realizes portable data acquisition and fault diagnosis, reduces the cost and complexity of the equipment, and improves the portability and mobility of the acquisition device.
Smart Images
Figure CN222850162U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical fault diagnosis, in particular to a portable rolling bearing vibration waveform acquisition device. Background Art
[0002] Rolling bearings are one of the most important components in modern mechanical engineering. They undertake the important tasks of supporting rotating parts, reducing friction and transmitting loads. The normal operation of rolling bearings is essential to ensure the stability and performance of the equipment. However, due to long-term use, poor working conditions or manufacturing defects, rolling bearings may fail, resulting in equipment downtime and production losses. At present, the methods for rolling bearing fault diagnosis include vibration analysis, sound analysis, temperature monitoring, oil analysis, visual inspection and other methods. Among them, vibration analysis is widely used in rolling bearing fault diagnosis due to its non-invasiveness, high sensitivity and rich information.
[0003] The data acquisition card is the core module for collecting vibration signals, integrating the A / D module and communication module required for collecting signals. Data acquisition cards are usually expensive and have many channels. Portable data acquisition does not actually require so many channels, and the data acquisition card itself does not have the acquisition function. It needs to be connected to a computer to realize data acquisition and analysis functions. The existing data acquisition devices have complex wiring and are complicated to use, and the acquisition cards are expensive. Utility Model Content
[0004] The utility model provides a portable rolling bearing vibration waveform acquisition device, which solves the problem that the existing data acquisition card is expensive and inconvenient to carry and use.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A portable rolling bearing vibration waveform acquisition device, comprising: an ICP acceleration sensor, a constant current source power supply circuit, a signal conditioning circuit, a single chip microcomputer and a display module;
[0007] The ICP acceleration sensor is internally integrated with a charge amplifier, the input end of the ICP acceleration sensor is connected to the measuring point of the rolling bearing to be measured, and the output end of the ICP acceleration sensor is connected to the signal conditioning circuit; the ICP acceleration sensor is connected to the constant current source power supply circuit and the signal conditioning circuit;
[0008] The input end of the signal conditioning circuit is connected to the ICP acceleration sensor, and the output end of the signal conditioning circuit is connected to the ADC voltage conditioning circuit;
[0009] The input end of the ADC voltage conditioning circuit is connected to the signal conditioning circuit, and the output end of the ADC voltage conditioning circuit is connected to the single chip microcomputer;
[0010] The input end of the single chip microcomputer is connected to the ADC voltage conditioning circuit, and the output end of the single chip microcomputer is connected to the display module.
[0011] Furthermore, the ICP acceleration sensor converts the charge signal into a voltage analog signal and sends it to the signal conditioning circuit; the signal conditioning circuit filters the voltage analog signal and sends the filtered signal to the ADC voltage conditioning circuit, the ADC voltage conditioning circuit performs digital-to-analog conversion on the filtered signal and outputs a vibration signal to the microcontroller, and the microcontroller sends the vibration signal to the display module and the cloud server.
[0012] Furthermore, the single chip microcomputer is a STM32F407VET6 chip.
[0013] Furthermore, the single chip microcomputer is connected to the first tripod dial wheel SW2 and the second tripod dial wheel SW3.
[0014] Furthermore, the first three-pin dial SW2 and the second three-pin dial SW3 use a timer interface module of the single-chip microcomputer to recognize orthogonal waveforms.
[0015] Furthermore, the constant current source power supply circuit is a LM317 chip.
[0016] Furthermore, the signal conditioning circuit is MAX296.
[0017] Furthermore, the display module uses a TFT capacitive touch screen, and the control chip of the display module is ILI9488.
[0018] Furthermore, the single chip microcomputer is connected to a single chip microcomputer digital power supply circuit.
[0019] Furthermore, the voltage of the single-chip microcomputer digital power supply circuit is 24V.
[0020] Compared with the traditional acquisition card, the technical solution of the utility model has the following advantages:
[0021] The circuit structure of the utility model is simple, low cost and highly integrated. It does not need to be connected to a computer for data collection. It only needs to install the sensor on the measuring point of the rolling bearing to be tested with a handheld device to collect data. The device is easy to carry and can be moved to collect data and diagnose faults at more measuring points. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 This is a system block diagram of the utility model.
[0024] Figure 2 It is the minimum system circuit of the single chip microcomputer of the utility model.
[0025] Figure 3 The utility model discloses a single chip microcomputer digital power supply circuit.
[0026] Figure 4 The utility model discloses a constant current source power supply circuit for an ICP acceleration sensor.
[0027] Figure 5 This is a signal conditioning circuit of the utility model.
[0028] Figure 6 This is an ADC voltage conditioning circuit of the utility model.
[0029] Figure 7 This is a display module circuit of the utility model.
[0030] Figure 8 This is the cloud communication module circuit of the utility model. DETAILED DESCRIPTION
[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0036] The utility model provides a technical solution: a portable rolling bearing vibration waveform collection device, such as Figure 1 As shown, it includes an ICP acceleration sensor, a constant current source power supply circuit, a signal conditioning circuit, an ADC voltage follower circuit, a single chip microcomputer, a display module, and a communication module. The ICP acceleration sensor utilizes the piezoelectric effect of certain materials such as quartz crystals. When the accelerometer is vibrated, the mass block is added to the piezoelectric element, which is subjected to external force and generates charge due to inertia. The sensor integrates a charge amplifier, which can convert the generated charge signal into a measurable voltage analog signal; the constant current source power supply circuit is connected to the ICP acceleration sensor to provide it with a constant 4mA current; the signal conditioning circuit is connected to the ICP acceleration sensor to perform low-pass filtering on the analog voltage signal, filter out frequencies above 50KHz, and only allow frequency components below 50KHz to pass; the analog output ADC voltage follower circuit of the signal conditioning circuit finally outputs a voltage between 0 and 2.5V, which can then be input to the ADC interface of the single chip microcomputer for analog-to-digital conversion. The single chip microcomputer can modify various parameters such as sampling frequency and number of sampling points.
[0037] The single-chip microcomputer can control the display module to output the collected vibration signal, encapsulate the information of the vibration signal, and communicate with the fault diagnosis system in the cloud server to diagnose the health status of the rolling bearing under test in real time. The fault diagnosis program running in the server processes the diagnosis result and transmits it to the single-chip microcomputer, which is then displayed by the display module for the staff to view.
[0038] like Figure 2 As shown in the figure, the specific single-chip microcomputer model of the portable rolling bearing vibration waveform acquisition device is STM32F407VET6 chip, which has 100 chip pins. The minimum system consists of peripheral power supply filtering, reset, clock, debugging, and startup configuration circuits. The system can be reset by pulling the RST pin down for a period of time, so it is designed that RST is grounded and reset when SW1 is pressed. The single-chip microcomputer will first run at a low speed with a 32.678KHz crystal oscillator signal, and after initialization, it will switch to a high-speed crystal oscillator signal of 8MHz. A green LED is designed to check whether the power supply of the single-chip microcomputer is normal. According to the SWD serial standard interface circuit design, the SWDIO interface is pulled up and the SWCLK is pulled down. The single-chip microcomputer is configured to start from flash memory, system memory or internal SRAM through the startup mode configuration circuit. The default serial port 1 of the single-chip microcomputer is brought out so that it can communicate with an external computer or other device to increase the flexibility of the portable rolling bearing vibration waveform acquisition device. Two tripod dials SW2 and SW3 are added to interact with the user. The tripod dial uses the timer interface module of the single-chip microcomputer to identify orthogonal waveforms. Design the power supply filter circuit to filter the microcontroller power supply, the external reference voltage required by the ADC, etc. If the filtering process is not performed, the power supply may be unstable and the circuit may run away.
[0039] like Figure 3 As shown in the figure, the portable rolling bearing vibration waveform acquisition device is powered by a 24V power supply. The power supply passes through the D1 Schottky diode, and the power supply ripple is filtered out through the C41 and C42 capacitors. Then, the SW4 switch can be used to select whether the power supply is connected. The 24V voltage is converted to 5V voltage through the LM7805S / TR, which can be used as the power input for the switch low-pass filter of the subsequent signal conditioning circuit. The 5V voltage is converted to 3.3V voltage through RS3236-3.3YF5, which can be used for digital power supply of the microcontroller.
[0040] like Figure 4 As shown, a 4mA constant current source is provided for the ICP acceleration sensor through the LM317 chip. There is a voltage stabilization measure between ADJ and VOUT inside the LM317 chip, that is, the voltage across the resistor R4 is 1.25V, and the voltage value is constant, so a 4mA constant current source can be designed according to the following formula.
[0041]
[0042] A 1uF bypass capacitor C28 is added to the input voltage end to stabilize the power supply voltage. A 1uF electrolytic capacitor is designed at the voltage output end to filter out the DC voltage.
[0043] like Figure 5 As shown, in order to filter out the DC component in the signal, MAX296 is added to perform low-pass filtering on the signal to reduce the out-of-band signal. The cutoff frequency of MAX296 is determined by the clock frequency, which is 50 times the cutoff frequency. The frequency range of the collected vibration signal is 0-50KHz, and the calculated clock frequency is 2.5MHz. The value of the external capacitor C37 is 13pF calculated by the following formula.
[0044]
[0045] like Figure 6 As shown, according to Figure 3 The ADC input voltage range of the designed STM32 minimum system is 0-3.3V. In order to remove the DC component, a capacitor C40 is first added as a coupling capacitor, and the reference voltage 1.25V is set through resistors R36 and R37, which reduces the 0-5V sensor input voltage to 0-1.25V input to the op amp. According to the principle of voltage follower, the final output voltage is between 0-2.5V, which meets the requirements. Figure 3 Designed STM32 minimum system ADC sampling voltage range requirements.
[0046] like Figure 7 As shown in the figure, the display module uses a TFT capacitive touch screen, and the control chip is ILI9488. In order to achieve a high refresh rate and improve the user experience, the FSMC interface of the microcontroller is used to control the display chip. This interface can simulate the timing required by ILI9488 for image data transmission. Since 16-bit data can be transmitted at a time and the timing is all implemented by hardware circuits, a high refresh rate can be achieved well.
[0047] like Figure 8 As shown in the figure, the cloud communication module circuit is connected to the MCU through the serial port. The ultra-low power consumption 32-bit micro wireless module ESP8266 can realize wireless connection and data transmission with the TCP server through simple commands by flashing the corresponding AT command firmware. Through ESP_IO0, the wireless module can be controlled to perform local serial port upgrade of AT firmware to achieve more customized functions.
[0048] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A portable rolling bearing vibration waveform collection device, characterized in that: include: ICP acceleration sensor, constant current source power supply circuit, signal conditioning circuit, single chip microcomputer and display module; The ICP acceleration sensor is internally integrated with a charge amplifier, the input end of the ICP acceleration sensor is connected to the measuring point of the rolling bearing to be measured, and the output end of the ICP acceleration sensor is connected to the signal conditioning circuit; the ICP acceleration sensor is connected to the constant current source power supply circuit and the signal conditioning circuit; The input end of the signal conditioning circuit is connected to the ICP acceleration sensor, and the output end of the signal conditioning circuit is connected to the ADC voltage conditioning circuit; The input end of the ADC voltage conditioning circuit is connected to the signal conditioning circuit, and the output end of the ADC voltage conditioning circuit is connected to the single chip microcomputer; The input end of the single chip microcomputer is connected to the ADC voltage conditioning circuit, and the output end of the single chip microcomputer is connected to the display module.
2. The portable rolling bearing vibration waveform acquisition device according to claim 1 is characterized in that: The ICP acceleration sensor converts the charge signal into a voltage analog signal and sends it to the signal conditioning circuit; the signal conditioning circuit filters the voltage analog signal and sends the filtered signal to the ADC voltage conditioning circuit, the ADC voltage conditioning circuit performs digital-to-analog conversion on the filtered signal and outputs a vibration signal to the single-chip microcomputer, and the single-chip microcomputer sends the vibration signal to the display module and the cloud server.
3. The portable rolling bearing vibration waveform acquisition device according to claim 1 is characterized in that: The single chip microcomputer is a STM32F407VET6 chip.
4. The portable rolling bearing vibration waveform acquisition device according to claim 3 is characterized in that: The single chip microcomputer is connected to the first tripod dial wheel SW2 and the second tripod dial wheel SW3.
5. The portable rolling bearing vibration waveform acquisition device according to claim 4 is characterized in that: The first three-pin dial SW2 and the second three-pin dial SW3 use the timer interface module of the single-chip microcomputer to recognize the orthogonal waveform.
6. The portable rolling bearing vibration waveform acquisition device according to claim 1, characterized in that: The constant current source power supply circuit is a LM317 chip.
7. The portable rolling bearing vibration waveform acquisition device according to claim 1, characterized in that: The signal conditioning circuit is MAX296.
8. The portable rolling bearing vibration waveform acquisition device according to claim 1, characterized in that: The display module uses a TFT capacitive touch screen, and the control chip of the display module is ILI9488.
9. The portable rolling bearing vibration waveform acquisition device according to claim 1, characterized in that: The single chip microcomputer is connected to the single chip microcomputer digital power supply circuit.
10. The portable rolling bearing vibration waveform acquisition device according to claim 1, characterized in that: The voltage of the single-chip microcomputer digital power supply circuit is 24V.