CN114279552A - Portable vibration signal listening stick - Google Patents

Abstract

The invention relates to a portable vibration signal listening stick.A vibration signal received by a handheld unit is sent to a signal conditioning circuit, the signal conditioning circuit filters and amplifies the vibration signal and then outputs the vibration signal to an AD conversion module, the AD conversion module carries out analog-to-digital conversion on the signal and then sends the signal to an MCU chip, and the MCU chip forms a frequency spectrum signal after filtering and amplifying and FFT conversion on an input signal and transmits the frequency spectrum signal to a mobile phone through a first Bluetooth module in a communication way; and the MCU chip carries out high-pass filtering on the input signal and then sends the input signal to the Bluetooth headset through the second Bluetooth module. The device vibration signal is converted into an audio signal, and the signal is monitored through the Bluetooth headset, so that the integrity, accuracy and intuitiveness of the received information are guaranteed; the mechanical listening rod is detachable, so that the volume of the whole product is greatly reduced, and the mechanical listening rod is easy to carry; through signal processing, signal distortion is avoided; the mobile phone is used for watching the frequency spectrum, the signal is accurately analyzed, and the traditional listening rod is used for extending the probe rod, so that the components which are not convenient to directly measure under the conventional condition can be monitored.

Description

Portable vibration signal listening stick

Technical Field

The invention relates to a detection testing technology, in particular to a portable vibration signal listening rod.

Background

When the machine equipment runs, the vibration, temperature and sound conditions of the equipment running need to be monitored in real time, and the running conditions of the equipment can be judged by acquiring the parameters.

The listening rod is a tool for checking the working condition of machine equipment, and can check whether equipment runs in a fault or whether a pipeline leaks or not by monitoring the running sound or the echo of the pipeline when the equipment works, so that the listening rod is mainly used for detecting equipment pipelines which are difficult to directly measure or working environments which are inconvenient to directly monitor. Traditional listening stick is pure mechanical structure, and the structure is very simple, only needs the probe rod of metal material and just can constitute with the tympanic membrane of enlargiing sound, and sound passes through the mechanical structure conduction and enlargies the transmission for the people's ear through the tympanic membrane again. However, the sound of the purely mechanical listening rod is very small and has a large distortion after being transmitted by the listening rod, and even if the human ear is tightly attached to the amplified end of the tympanic membrane of the listening rod, the sound signal is difficult to be completely and accurately acquired.

At present, many listening sticks generally improve the sound conduction of the listening stick by a series of ways of modifying a mechanical structure, adding electronic component sensing and the like, but the following defects still exist: the listening rod still needs to be monitored by experienced personnel in real time and is very dependent on the discrimination ability of the personnel; the detection result of the listening stick is not directly visible, so that the listening stick is very inconvenient and rapid; the transmission signal of the listening rod is still easy to distort and is very easy to be influenced by the interference signal in the environment; the sensitivity is too low, and the similar sound signals are difficult to distinguish by human ears; the pure mechanical structure can not process the conducted sound signals, and the human ear is not sensitive to some signals and is difficult to monitor; the detection data of the listening stick can not be stored and played back, so that real-time comparative analysis can be carried out on the previous monitoring data, and the single detection result can not provide reference guidance for subsequent tests; the detection result of the listening rod can only be used for simply judging whether the fault exists or not by depending on experience, and can not be further accurately analyzed and can not be used for carrying out frequency analysis on the detection result.

The listening rod can only be used for monitoring sound signals, mechanical faults caused by vibration signals in industrial production are many, the vibration signals are directly related to the fault types and severity of equipment, and products in need can monitor other signals such as vibration.

Disclosure of Invention

Aiming at the problem of signal identification of a detection listening rod, the portable vibration signal listening rod is different from the traditional listening rod, can monitor the vibration signal of equipment, is used for collecting vibration parameters of the position of inconvenient direct measurement vibration signal in machine equipment, can playback the detection result and accurately analyzes the detection result.

The technical scheme of the invention is as follows: a portable vibration signal listening rod comprises a handheld unit, a monitoring unit, a Bluetooth earphone and a mobile phone, wherein the monitoring unit serving as an acquisition device is a vibration sensor of a listening rod type, the handheld unit serving as a power supply and signal receiving device is connected with the monitoring unit in a detachable connection mode, the handheld unit comprises a sensor power supply circuit, a signal conditioning circuit, an AD conversion module, an MCU chip and two Bluetooth modules, a vibration signal received by the handheld unit is sent to the signal conditioning circuit, the signal conditioning circuit filters and amplifies the vibration signal and then outputs the vibration signal to the AD conversion module, the AD conversion module sends the signal to the MCU chip after analog-to-digital conversion, the MCU chip filters and amplifies an input signal, a frequency spectrum signal is formed after FFT conversion, and the frequency spectrum signal is transmitted to the mobile phone through communication of the first Bluetooth module; and the MCU chip carries out high-pass filtering on the input signal and then sends the input signal to the Bluetooth headset through the second Bluetooth module.

Preferably, the monitoring unit comprises a vibration sensor, a sensor mounting base and a sensor probe, and the sensor probe is in threaded connection with the sensor mounting base for fixing the vibration sensor.

Preferably, the sensor probe is replaced by a mechanical ear-stick that directly contacts the piece of equipment through the shield.

Preferably, the vibration sensor is a piezoelectric acceleration sensor that measures high-frequency vibrations as well as transient vibrations.

Preferably, the handheld unit further comprises a FLASH chip and a display screen, the FLASH chip stores the data processed by the MCU chip, and the display screen displays the data acquired for many times.

The invention has the beneficial effects that: the portable vibration signal listening stick converts the equipment vibration signal into the audio signal, can detect the running state of the equipment more visually by detecting the equipment vibration signal, can store the signal and can play back the signal afterwards; the mechanical listening rod is provided with a handheld unit, can be detached and is connected with the sensor through threads when in use, so that the volume of the whole product is greatly reduced, and the mechanical listening rod is easy to carry; the signal is monitored through the Bluetooth earphone, so that the situation that a traditional listening stick needs a person to cling to one end of a tympanic membrane and the sound volume is low and unclear is avoided, and the integrity and the accuracy of received information are ensured; the signal is processed by the filter circuit and the power amplifier circuit, so that signal interference can be effectively eliminated, and signal distortion is avoided; the sensor has high sensitivity, and the detected frequency range is larger than the original direct human ear resolution, so that signals which are difficult to hear by human ears in low frequency bands and high frequency bands can be detected; the detection result before can be stored and played back on the mobile phone APP or the handheld unit, and the specific spectrogram can be seen on the mobile phone APP, so that the signal can be accurately analyzed, and the defect that the traditional listening stick excessively depends on manual experience is avoided; the traditional listening rod is used for extending the probe rod, so that the working condition of some parts which are not convenient to measure directly under the conventional condition can be monitored.

Drawings

FIG. 1 is a schematic structural diagram of a vibration signal listening bar according to the present invention;

fig. 2 is a circuit block diagram of the vibration signal listening stick of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Like the stick structure schematic diagram is listened to the vibration signal shown in fig. 1, the stick is listened to the vibration signal includes handheld unit 1, monitoring unit 2, stick 3 is listened to machinery, bluetooth headset 4 and cell-phone, monitoring unit 2 is as collection system, from last to including high accuracy vibration sensor 201 down, sensor installation base 202 and sensor probe 203 (optional), when monitoring can not paste the equipment position of pasting the sensor, sensor probe 203 passes through sensor installation base 202 and fixes on same vertical line with high accuracy vibration sensor 201, handheld unit 1 passes through detachable connected mode and monitoring unit 2 as power supply and signal receiver. Mechanical listening rod 3 is as the extension probe rod, and one end is the hickey 301 with sensor installation base 202 adaptation, and the other end is probe 302, to some inconvenient direct contact, can not paste the equipment position of dress sensor and vibration signal reason surface distance vibration far away monitor, the same with sensor probe 203 function, be suitable for the chooseing for use of different occasions. The handheld unit 1 communicates with the Bluetooth headset 4 and the mobile phone 5 in a Bluetooth mode, processes the received vibration signal and outputs the processed vibration signal. The wireless Bluetooth headset 4 is used as a monitoring device, and the APP in the mobile phone 5 visually displays the monitored vibration signals.

The high-precision vibration sensor 201 selects a high-precision piezoelectric acceleration sensor to measure the absolute vibration acceleration of the equipment, the piezoelectric acceleration sensor can measure high-frequency vibration and transient vibration, the sensitivity is high, and the method is suitable for application scenes of intelligent listening sticks. Install piezoelectric acceleration sensor on mechanical sound stick 3 through sensor installation base 202 threaded connection's mode, use traditional mechanical sound stick as the extension probe rod can monitor some inconvenient direct contact, can not paste the equipment position of dress sensor. The acquired vibration signals are transmitted to the sensor through the probe rod, the probe rod is subjected to corresponding forced vibration, and the vibration signals transmitted by the probe rod need to be correspondingly processed in subsequent signal processing.

The vibration signal listening rod can also choose not to use the mechanical listening rod to do 3 as an extension rod under some conventional application scenes, and the handheld unit 1 is directly used to connect the sensor for working, so that the product volume is smaller under the condition, and the use portability is greatly improved.

As shown in fig. 2, the vibration signal listening bar circuit block diagram is shown, the expansion function of the handheld unit 1 is the guarantee of product intellectualization, a series of processing modules after the vibration signal is collected are placed in the handheld unit 1, and the vibration signal processing module comprises a sensor power supply circuit 101, a signal conditioning circuit 102, an AD conversion module 103, an MCU chip 104, a bluetooth module 105, and 106, the vibration signal received by the handheld unit 1 is sent to the signal conditioning circuit 102, the signal conditioning circuit 102 filters and amplifies the vibration signal, and then the vibration signal enters a high-speed AD conversion module 103, and after the analog-to-digital conversion of the high-speed AD conversion module 103, the vibration signal is sent to the MCU chip 104 for signal software processing.

A software part: MCU chip 104 mainly carries out two way processing to the signal, and one way is through designing high pass filter, gets rid of the influence of many low frequency interference signal, then sends the signal after filtering for bluetooth headset 4 through bluetooth module 106, and the digital signal conversion audio frequency analog signal that can receive is carried to the audio decoding chip in the bluetooth headset, and another way is the FFT transform with the acceleration signal after the filtering is enlargied, communicates through bluetooth module 105 and transmits for cell-phone 5, shows the spectrogram that can do accurate analysis on cell-phone APP.

When the mechanical listening stick is used as the extension probe, the MCU chip 104 needs to perform a certain mapping process on the acquired vibration signal, so as to eliminate the influence on the probe to transmit the vibration signal, and restore the vibration signal to a real vibration signal of the machine.

The FLASH chip stores the detection results of the last 20 times, the stored data can be displayed through a display screen on the handheld unit 1, the collected signals before playback can also be played back and forth through the mobile phone APP, and comprehensive comparison and analysis can be carried out through different time before playback or vibration signals of different parts during detection, so that whether faults exist in the machine equipment can be judged more accurately.

The matched cell-phone APP of vibration signal listening stick mainly can make the record to part, the time of listening the stick and surveying, makes the record to the model manual work of equipment, can show the vibration frequency spectrum of listening stick contact member in real time.

Many machine equipment can install the protection casing and be arranged in isolated environment high temperature, dust, the influence of metal fillings, installs the protection casing additional under this kind of operational environment after, hardly utilizes sensor direct contact equipment detection equipment operating mode.

1. In this case, a mechanical listening rod 3 is attached to the hand-held unit 1 by screwing to the monitor unit 2.

2. The mechanical listening rod 3 is used as an extension rod and penetrates through the protective cover to directly contact equipment parts, a switch on the handheld unit 1 is turned on, the sensor 201 is powered by the sensor power supply circuit 101 in the handheld unit 1, and the acceleration sensor starts to acquire signals.

3. Whether the data are accurately acquired or not is checked through data display on the handheld unit 1, and whether missing detection or error detection exists or not can be roughly judged through real-time playback of a previous detection result.

4. The sensor collects vibration signals and outputs the vibration signals to the signal conditioning circuit 102, and the vibration signals are filtered and amplified by the conditioning circuit 102 and are sent to the high-speed AD103 to be converted into digital signals. MCU chip 104 is then through software design high pass filter, and some signal interference are eliminated in the high pass filter of signal entering, send bluetooth headset 4 through bluetooth module 106, and during the detection, personnel wear bluetooth headset 4. Personnel will hear the audio signal that vibration signal converts in bluetooth headset, judge whether the part of present detection exists unusually through audio signal.

5. The MCU chip 104 will perform FFT on the collected signals at the same time, and then communicate with the mobile phone 5 through the bluetooth module 105. During detection, the time of the measurement and the currently measured part can be marked on the mobile phone 5APP, and after the measurement of one device is completed, the complete spectrogram of the measurement of the device can be checked on the mobile phone 5 APP. By analyzing some characteristic frequencies in the vibration frequency spectrogram of the equipment, different characteristic frequencies correspond to different fault conditions.

Under some extreme working environments, a mechanical arm can be used for semi-automatically or fully automatically inspecting a mechanical production line, the probe is automatically extended out through the robot, the probe is withdrawn, and personnel can receive audio signals at a distance or observe a spectrogram on a mobile phone. The personnel are prevented from working under dangerous and extreme working conditions.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (5)

1. A portable vibration signal listening rod is characterized by comprising a handheld unit, a monitoring unit, a Bluetooth earphone and a mobile phone, wherein the monitoring unit serving as an acquisition device is a vibration sensor of a listening rod type, the handheld unit serving as a power supply and signal receiving device is connected with the monitoring unit in a detachable connection mode, the handheld unit comprises a sensor power supply circuit, a signal conditioning circuit, an AD conversion module, an MCU chip and two Bluetooth modules, a vibration signal received by the handheld unit is sent to the signal conditioning circuit, the signal conditioning circuit filters and amplifies the vibration signal and then outputs the vibration signal to the AD conversion module, the AD conversion module sends the signal to the MCU chip after analog-to-digital conversion, the MCU chip filters and amplifies an input signal and forms a spectrum signal after FFT conversion, and the spectrum signal is transmitted to the mobile phone through communication of the first Bluetooth module; and the MCU chip carries out high-pass filtering on the input signal and then sends the input signal to the Bluetooth headset through the second Bluetooth module.

2. A portable vibration signal listening bar according to claim 1, wherein said monitoring unit comprises a vibration sensor, a sensor mounting base and a sensor probe, the sensor probe being threadedly connected to the sensor mounting base to which the vibration sensor is secured.

3. A portable vibration signal listening bar according to claim 2 wherein said sensor probe is replaced by a mechanical listening bar which passes through a protective cover and directly contacts the piece of equipment.

4. A portable vibration signal listening bar according to any one of claims 1, 2 and 3, wherein said vibration sensor is selected from piezoelectric acceleration sensors for measuring high frequency vibrations and transient vibrations.

5. The portable vibration signal listening stick of claim 4, wherein the handheld unit further comprises a FLASH chip and a display screen, the FLASH chip stores data processed by the MCU chip, and the display screen displays data collected for a plurality of times.

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