Noise detector utilizing sound spectrum analysis and analysis method thereof

Abstract

The invention discloses a noise detector utilizing sound spectrum analysis and an analysis method thereof, and relates to the field of noise detection. The noise detector utilizing sound spectrum analysis comprises a supporting unit and a detection unit, the detection unit is installed at the top end of the supporting unit and used for detecting the noise decibel of the nearby environment, and the detection unit comprises a detection box body, a cleaning box body, a pickup assembly, an electric push rod, a cleaning unit and a driving assembly. According to the noise detector utilizing sound spectrum analysis, the pickup assembly can enter and exit from the cleaning box body by utilizing the electric push rod, the pickup assembly entering the cleaning box body separates the pickup main body from the outer protective net cover through the driving assembly and the arc-shaped clamping block, and then the outer protective net cover is cleaned by utilizing the cleaning unit; and the multiple sets of cleaning box bodies and the multiple sets of pickup assemblies are utilized, so that switching between working and cleaning of the different pickup assemblies can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of noise detection, and particularly to a noise detector using sound spectrum analysis and its analysis method. Background Art

[0002] With the acceleration of the industrialization and urbanization processes, noise pollution has become an important environmental problem affecting human health and quality of life. Traditional noise detection devices usually adopt a fixed microphone design, which has the following technical defects: Difficult Maintenance The outer protective mesh cover of the microphone is exposed to the environment for a long time and is easily blocked by pollutants such as dust and oil, resulting in a decrease in detection accuracy. Traditional devices require manual disassembly and cleaning at regular intervals, with high maintenance costs and low efficiency.

[0003] Detection Interruption The single microphone design cannot continue to work during cleaning or maintenance, resulting in discontinuous detection data and making it difficult to meet the long-term monitoring requirements (such as traffic noise, industrial noise, etc.).

[0004] Therefore, the present application proposes a noise detector using sound spectrum analysis and its analysis method. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a noise detector using sound spectrum analysis and its analysis method, which solves the problems of difficult maintenance and detection interruption existing in traditional noise detection devices that usually adopt a fixed microphone design.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A noise detector using sound spectrum analysis includes a support unit and a detection unit. The detection unit is installed at the top of the support unit and is used to detect the ambient noise decibels in the vicinity. The detection unit includes a detection box body, a cleaning box body, a microphone assembly, an electric push rod, a cleaning unit, and a driving component; The detection box body is internally provided with a sound spectrum analysis module. The cleaning box body is optionally arranged outside the detection box body. The microphone assembly is optionally arranged on the top or inside of the cleaning box body. The microphone assembly includes a microphone main body and an outer protective mesh cover. The outer protective mesh cover is sleeved outside the microphone main body. The electric push rod is fixedly installed inside the cleaning box body, and the top of the output shaft of the electric push rod is fixedly connected to the bottom of the microphone assembly. The cleaning unit, a waterproof cover, and an arc-shaped block are all arranged inside the cleaning box body, and the driving component can drive the waterproof cover and the arc-shaped block to move horizontally; The electric push rod can be used to make the sound pickup assembly enter and exit the cleaning box body. The sound pickup assembly entering the cleaning box body separates the main body of the sound pickup and the outer protective net cover through the driving assembly and the arc-shaped clamping block, and then the cleaning unit is used to clean the outer protective net cover. At the same time, the driving assembly cooperates with the waterproof cover to waterproof the main body of the sound pickup, thereby realizing the automatic cleaning work of the sound pickup assembly. And by using multiple groups of cleaning box bodies and multiple groups of sound pickup assemblies, the switching between the work and cleaning of different sound pickup assemblies can be realized.

[0007] Preferably, the support unit includes a support rod, a first clamp and a second clamp. The support rod is fixedly installed at the detection position through embedded bolts. The first clamp and the second clamp are respectively sleeved on the outer side of the support rod. The first clamp is used to install the detection box body, and the second clamp is connected with a display screen. An alarm and a signal antenna are fixedly installed on the top of the detection box body.

[0008] Preferably, the sound pickup assembly further includes a support rod and an inner protective net cover. The main body of the sound pickup is fixedly installed at the top of the support rod. The inner protective net cover is sleeved on the outer side of the main body of the sound pickup. The bottom end of the outer protective net cover is clamped to the outer side of the top of the support rod. The outer protective net cover is located outside the inner protective net cover, and a limiting convex ring is fixedly connected to the outer side of the bottom end of the outer protective net cover. An arc-shaped clamping groove adapted to the limiting convex ring is formed on the side surface of the arc-shaped clamping block.

[0009] Preferably, an annular groove is formed on the outer side of the top end of the support rod. A rubber extrusion ring is fixedly connected to the inner wall of the bottom of the outer protective net cover, and the rubber extrusion ring is adapted to the annular groove. The bottom end of the support rod is fixedly connected with a base, and the base is connected with the output shaft of the electric push rod.

[0010] Preferably, the cleaning unit is composed of an atomizing nozzle and a blowing pipe. The atomizing nozzle and the blowing pipe are both inclined and arranged inside the cleaning box body. The atomizing nozzle sprays cleaning liquid towards the outer protective net cover and cooperates with the blowing pipe to blow air, thereby realizing the cleaning of the outer protective net cover.

[0011] Preferably, an opening adapted to the base is formed on the top of the cleaning box body. Two sealing plates are symmetrically and slidably arranged on the inner top wall of the cleaning box body. The two sealing plates can be used to open or seal the opening. A sealing ring is installed inside the cleaning box body, and the inner ring of the sealing ring is adapted to the base.

[0012] Preferably, the driving assembly includes a first driving mechanism and a second driving mechanism. The first driving mechanism is connected with two arc-shaped clamping blocks, and the first driving mechanism is used to realize the relative movement of the two arc-shaped clamping blocks. The second driving mechanism is connected with two waterproof covers and two sealing plates, and the second driving mechanism is used to realize the relative movement of the two waterproof covers and the relative movement of the two sealing plates.

[0013] Preferably, the first driving mechanism includes a first driving motor, a first belt transmission member, and a first bidirectional lead screw. The first driving motor is fixedly installed on the back of the cleaning box body. The first bidirectional lead screw is rotatably arranged inside the cleaning box body, and the first belt transmission member is installed between the end of the output shaft of the first driving motor and the end of the first bidirectional lead screw. Two first nut blocks are symmetrically and threadedly connected to both sides of the first bidirectional lead screw. Both of the two first nut blocks are slidably connected to the inner wall of the cleaning box body, and the two first nut blocks are respectively fixedly connected to the two arc-shaped clamping blocks.

[0014] Preferably, the second driving mechanism includes a second driving motor, a second belt transmission member, and a second bidirectional lead screw. The second driving motor is fixedly installed on the back of the cleaning box body. The second bidirectional lead screw is rotatably arranged inside the cleaning box body, and the second belt transmission member is installed between the end of the output shaft of the second driving motor and the end of the second bidirectional lead screw. Two second nut blocks are symmetrically and threadedly connected to both sides of the second bidirectional lead screw. Both of the two second nut blocks are slidably connected to the inner wall of the cleaning box body, and the two second nut blocks are respectively fixedly connected to the two waterproof covers. A connecting strip is fixedly connected between the waterproof cover and the sealing plate on the same side.

[0015] An analysis method of a noise detector using sound spectrum analysis, the analysis method includes the following steps: S1: Environmental noise detection stage The electric push rod pushes the sound pickup assembly up to the working position outside the cleaning box body. At this time, the outer protective net cover plays an effective role in protecting and dust-proofing the sound pickup body. The sound pickup body is used to collect environmental sound wave signals. The sound spectrum analysis module is responsible for converting the analog sound signals collected by the sound pickup assembly into digital signals, generating a frequency spectrum diagram through Fourier transform, analyzing the frequency components and energy distribution of the sound, and then transmitting the detection data to the monitoring center. S2: Calculation stage of the blockage degree of the outer protective net cover Under the clean state of the outer protective net cover, the sound spectrum analysis module records the reference frequency spectrum and sound pressure level of the sound pickup body, and stores the reference signal as a comparison reference. When the detector is working, continuously collect the real-time acoustic signals of the sound pickup body, generate a real-time frequency spectrum through fast Fourier transform, and compare it with the reference frequency spectrum. Pay attention to the attenuation situation in the high-frequency band. Blockage will cause the high-frequency sound waves to attenuate more severely. Calculate the spectrum deviation index or the change amount of the signal-to-noise ratio, and judge the blockage degree according to the preset threshold. S3: Automatic cleaning stage When it is detected that the blockage degree of the outer protective net cover exceeds the threshold or the cumulative working duration reaches the preset value: The electric push rod drives the sound pickup component to descend into the cleaning box body The driving component drives the two arc-shaped clamping blocks to move towards each other, and uses the two arc-shaped clamping blocks to fix the outer protective net cover. At this time, if the driving of the pickup body continues to descend, the pickup body will be separated from the outer protective net cover. Then, the driving component is used again to drive the two waterproof covers to move towards each other, so that after the two waterproof covers are closed, the pickup body is sealed and waterproofed; Then, the atomizing nozzle is turned on to spray a special cleaning agent towards the outer protective net cover, and the air blowing pipe simultaneously outputs compressed air to form a gas-liquid mixed eddy current, completing the deep cleaning of the surface and pores of the net cover; S4: Working component switching stage When a single set of sound pickup components enters the cleaning process, the electric push rod of the adjacent cleaning box body pushes another sound pickup component to rise to the working position; The sound pickup component that has completed cleaning is dried in the cleaning box body. When the working sound pickup component needs to be cleaned, the electric push rod is used to drive the pickup body to dock with the outer protective net cover that has been cleaned, and then rise to the working position again, thus realizing the free switching of multiple sound pickup components.

[0016] The present invention discloses a noise detector using sound spectrum analysis and its analysis method, and the beneficial effects thereof are as follows: The noise detector using sound spectrum analysis can use the electric push rod to make the sound pickup component enter and exit the cleaning box body. The sound pickup component entering the cleaning box body separates the pickup body and the outer protective net cover through the driving component and the arc-shaped clamping block, and then uses the cleaning unit to clean the outer protective net cover. At the same time, the driving component cooperates with the waterproof cover to waterproof the pickup body, thereby realizing the automatic cleaning work of the sound pickup component. Moreover, by using multiple sets of cleaning box bodies and multiple sets of sound pickup components, the switching between the work and cleaning of different sound pickup components can be realized.

[0017] For the noise detector using sound spectrum analysis, the sound pickup component is double-protected by the outer protective net cover and the inner protective net cover to filter dust and moisture in the environment. The pickup body converts sound vibration into an electrical signal, and the electrical signal is transmitted through the support rod and the base to the signal processing unit in the detection box body. After amplification and filtering, the sound spectrum analysis module generates a spectrogram, and the real-time decibel value is displayed on the display screen. When the over-limit threshold is triggered, the alarm sounds, and the detection data is transmitted to the monitoring center through the signal antenna.

[0018] For the noise detector using sound spectrum analysis, when a single set of sound pickup components enters the cleaning process, the sound pickup stops. At this time, the electric push rod of the adjacent cleaning box body pushes the standby sound pickup component to rise to the working position for sound pickup work. Multiple sets of sound pickup components realize the synchronous transmission of detection data through the signal antenna, and the data stream received by the monitoring center is not interrupted. Description of the drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the back structure of the present invention; Figure 3 It is a schematic diagram of the structure of the detection unit of the present invention; Figure 4 It is a partial cross-sectional view of the present invention when the sound pickup component is inside the cleaning box; Figure 5 It is a partial cross-sectional view of the present invention when the sound pickup component is outside the cleaning box; Figure 6 It is a partial cross-sectional view of the cleaning box of the present invention; Figure 7 It is a schematic diagram of the structure of the first driving mechanism and the arc-shaped clamping block of the present invention; Figure 8 It is a schematic diagram of the structure of the second driving mechanism, the waterproof cover and the sealing plate of the present invention; Figure 9 It is an exploded view of the structure of the sound pickup component of the present invention.

[0021] In the figure: 1. Support unit; 11. Support rod; 12. First clamp; 13. Second clamp; 2. Detection unit; 21. Detection box; 211. Alarm; 212. Signal antenna; 22. Cleaning box; 221. Opening; 222. Sealing ring; 23. Sound pickup component; 231. Support rod; 232. Sound pickup body; 233. Inner protective mesh cover; 234. Outer protective mesh cover; 235. Annular groove; 236. Rubber extrusion ring; 237. Limit convex ring; 238. Base; 24. Electric push rod; 25. Cleaning unit; 251. Atomizing nozzle; 252. Blowing pipe; 26. Waterproof cover; 27. Arc-shaped clamping block; 271. Arc-shaped clamping groove; 28. Sealing plate; 29. Driving component; 291. First driving mechanism; 2911. First driving motor; 2912. First belt transmission component; 2913. First bidirectional lead screw; 2914. First nut block; 292. Second driving mechanism; 2921. Second driving motor; 2922. Second belt transmission component; 2923. Second bidirectional lead screw; 2924. Second nut block; 2925. Connecting bar; 3. Display screen. Specific implementation manner

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In an embodiment of the present application, by providing a noise detector using sound spectrum analysis and its analysis method, the problem that traditional noise detection devices usually adopt a fixed microphone design, resulting in difficult maintenance and detection interruption, is solved. The electric push rod 24 can be used to move the sound pickup assembly 23 in and out of the cleaning box body 22. The sound pickup assembly 23 entering the cleaning box body 22 separates the microphone main body 232 and the outer protective net cover 234 through the driving assembly 29 and the arc-shaped clamping block 27. Then, the cleaning unit 25 is used to clean the outer protective net cover 234. At the same time, the driving assembly 29 cooperates with the waterproof cover 26 to waterproof the microphone main body 232, thereby realizing the automatic cleaning work of the sound pickup assembly 23. Moreover, by using multiple groups of cleaning box bodies 22 and multiple groups of sound pickup assemblies 23, the switching between the work and cleaning of different sound pickup assemblies 23 can be realized.

[0024] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the specification drawings and specific implementation manners.

[0025] An embodiment of the present invention discloses a noise detector using sound spectrum analysis.

[0026] According to the attached Figures 1-9 As shown, it includes a support unit 1 and a detection unit 2. The detection unit 2 is installed at the top of the support unit 1 and is used to detect the ambient noise decibel nearby. The detection unit 2 includes a detection box body 21, a cleaning box body 22, a sound pickup assembly 23, an electric push rod 24, a cleaning unit 25, and a driving assembly 29; The detection box body 21 is internally provided with a sound spectrum analysis module. The cleaning box body 22 is optionally arranged outside the detection box body 21. The sound pickup assembly 23 is optionally arranged on the top or inside of the cleaning box body 22. The sound pickup assembly 23 includes a sound pickup main body 232 and an outer protective mesh cover 234. The outer protective mesh cover 234 is sleeved outside the sound pickup main body 232. The electric push rod 24 is fixedly installed inside the cleaning box body 22, and the top end of the output shaft of the electric push rod 24 is fixedly connected to the bottom of the sound pickup assembly 23. The cleaning unit 25, the waterproof cover 26 and the arc-shaped clamping block 27 are all arranged inside the cleaning box body 22. The driving assembly 29 can drive the waterproof cover 26 and the arc-shaped clamping block 27 to move horizontally; The electric push rod 24 can be used to make the sound pickup assembly 23 enter and exit the cleaning box body 22. When the sound pickup assembly 23 enters the cleaning box body 22, the driving assembly 29 and the arc-shaped clamping block 27 are used to separate the sound pickup main body 232 and the outer protective mesh cover 234. Then, the cleaning unit 25 is used to clean the outer protective mesh cover 234. At the same time, the driving assembly 29 cooperates with the waterproof cover 26 to waterproof the sound pickup main body 232, thereby realizing the automatic cleaning work of the sound pickup assembly 23. By using multiple groups of cleaning box bodies 22 and multiple groups of sound pickup assemblies 23, the switching between the work and cleaning of different sound pickup assemblies 23 can be realized.

[0027] Further, the support unit 1 includes a support rod 11, a first clamp 12 and a second clamp 13. The support rod 11 is fixedly installed at the detection position through embedded bolts. The first clamp 12 and the second clamp 13 are respectively sleeved outside the support rod 11. The first clamp 12 is used to install the detection box body 21, and the second clamp 13 is connected to a display screen 3. An alarm 211 and a signal antenna 212 are fixedly installed on the top of the detection box body 21.

[0028] Specifically disclosed, the sound pickup assembly 23 further includes a support rod 231 and an inner protective mesh cover 233. The sound pickup main body 232 is fixedly installed at the top of the support rod 231. The inner protective mesh cover 233 is sleeved outside the sound pickup main body 232. The bottom end of the outer protective mesh cover 234 is clamped to the outside of the top of the support rod 231. The outer protective mesh cover 234 is located outside the inner protective mesh cover 233. And a limiting convex ring 237 is fixedly connected to the outside of the bottom end of the outer protective mesh cover 234. An arc-shaped clamping groove 271 adapted to the limiting convex ring 237 is formed on the side surface of the arc-shaped clamping block 27.

[0029] Specifically disclosed, an annular groove 235 is formed on the outer side of the top end of the support rod 231. A rubber extrusion ring 236 is fixedly connected to the inner wall of the bottom of the outer protective mesh cover 234, and the rubber extrusion ring 236 is adapted to the annular groove 235. A base 238 is fixedly connected to the bottom end of the support rod 231, and the base 238 is connected to the output shaft of the electric push rod 24.

[0030] The first driving mechanism 291 drives the two arc-shaped clamping blocks 27 to move towards each other, and they are clamped with the limiting convex ring 237 at the bottom of the outer protective net cover 234 through the arc-shaped clamping grooves 271. At this time, continue to drive the pickup body 232 to descend, so that the rubber extrusion ring 236 at the bottom of the outer protective net cover 234 is separated from the annular groove 235 at the top of the support rod 231, thereby realizing the separation of the outer protective net cover 234 and the pickup body 232; Further, the cleaning unit 25 is composed of an atomizing nozzle 251 and a blowing pipe 252. The atomizing nozzle 251 and the blowing pipe 252 are both inclined and arranged inside the cleaning box body 22. The atomizing nozzle 251 sprays the cleaning liquid towards the outer protective net cover 234 and cooperates with the blowing pipe 252 to blow air, thereby realizing the cleaning of the outer protective net cover 234.

[0031] The atomizing nozzle 251 sprays the cleaning agent, and the blowing pipe 252 synchronously outputs compressed air to form a gas-liquid mixed eddy current to clean the outer protective net cover 234. The pickup assembly 23 that has been cleaned is dried in the cleaning box body 22. Further, a fan is installed inside the cleaning box body 22, and the fan can be used to quickly air-dry the outer protective net cover 234 after cleaning. At the same time, a drain pipe is installed at the bottom of the cleaning box body 22 to discharge the generated sewage.

[0032] Further, an opening 221 adapted to the base 238 is provided at the top of the cleaning box body 22. Two sealing plates 28 are symmetrically and slidably arranged on the inner top wall of the cleaning box body 22. The two sealing plates 28 can be used to open or seal the opening 221. A sealing ring 222 is installed inside the cleaning box body 22, and the inner ring of the sealing ring 222 is adapted to the base 238.

[0033] Specifically disclosed, the driving assembly 29 includes a first driving mechanism 291 and a second driving mechanism 292. The first driving mechanism 291 is connected to the two arc-shaped clamping blocks 27, and the first driving mechanism 291 is used to realize the relative movement of the two arc-shaped clamping blocks 27. The second driving mechanism 292 is connected to the two waterproof covers 26 and the two sealing plates 28, and the second driving mechanism 292 is used to realize the relative movement of the two waterproof covers 26 and the relative movement of the two sealing plates 28.

[0034] Further, the first driving mechanism 291 includes a first driving motor 2911, a first belt transmission member 2912, and a first bidirectional lead screw 2913. The first driving motor 2911 is fixedly installed on the back surface of the cleaning box body 22. The first bidirectional lead screw 2913 is rotatably arranged inside the cleaning box body 22. The first belt transmission member 2912 is installed between the end of the output shaft of the first driving motor 2911 and the end of the first bidirectional lead screw 2913. Two first nut blocks 2914 are symmetrically threadedly connected to both sides of the first bidirectional lead screw 2913. Both of the two first nut blocks 2914 are slidably connected to the inner wall of the cleaning box body 22, and the two first nut blocks 2914 are respectively fixedly connected to the two arc-shaped clamping blocks 27.

[0035] When the first driving motor 2911 works, its output shaft can drive the first bidirectional lead screw 2913 to rotate through the first belt transmission member 2912. The two first nut blocks 2914 are symmetrically threadedly connected to the outside of the first bidirectional lead screw 2913. At the same time, both of the two first nut blocks 2914 are slidably connected to the inner wall of the cleaning box body 22. Then, the two arc-shaped clamping blocks 27 can be driven to move towards or away from each other through the two first nut blocks 2914. Further, the second driving mechanism 292 includes a second driving motor 2921, a second belt transmission member 2922, and a second bidirectional lead screw 2923. The second driving motor 2921 is fixedly installed on the back surface of the cleaning box body 22. The second bidirectional lead screw 2923 is rotatably arranged inside the cleaning box body 22. The second belt transmission member 2922 is installed between the end of the output shaft of the second driving motor 2921 and the end of the second bidirectional lead screw 2923. Two second nut blocks 2924 are symmetrically threadedly connected to both sides of the second bidirectional lead screw 2923. Both of the two second nut blocks 2924 are slidably connected to the inner wall of the cleaning box body 22, and the two second nut blocks 2924 are respectively fixedly connected to the two waterproof covers 26. A connecting strip 2925 is fixedly connected between the waterproof cover 26 and the sealing plate 28 on the same side.

[0036] When the second driving motor 2921 works, its output shaft can drive the second bidirectional lead screw 2923 to rotate through the second belt transmission member 2922. The two second nut blocks 2924 are symmetrically threadedly connected to the outside of the second bidirectional lead screw 2923. At the same time, both of the two second nut blocks 2924 are slidably connected to the inner wall of the cleaning box body 22. Then, the two waterproof covers 26 can be driven to move towards or away from each other through the two second nut blocks 2924. Under the action of the connecting strip 2925, the two sealing plates 28 can be synchronously moved. The sound pickup component 23 is protected by a double-layer protection of an outer protective mesh cover 234 and an inner protective mesh cover 233 to filter dust and moisture in the environment. The sound pickup main body 232 converts sound vibrations into electrical signals, and the electrical signals are transmitted through the support rod 231 and the base 238 to the signal processing unit in the detection box 21. After amplification and filtering, the spectrogram analysis module generates a spectrogram, and the real-time decibel value is displayed on the display screen 3. When the over-limit threshold is triggered, the alarm 211 alarms, and the detection data is transmitted to the monitoring center through the signal antenna 212.

[0037] When it is detected that the blockage degree of the outer protective mesh cover 234 exceeds the threshold or the cumulative working duration reaches the preset value, the electric push rod 24 drives the sound pickup component 23 to descend into the cleaning box body 22; The first driving mechanism 291 drives two arc-shaped blocks 27 to move towards each other, and is clamped with the limit convex ring 237 at the bottom of the outer protective mesh cover 234 through the arc-shaped card slot 271. At this time, the sound pickup main body 232 is continuously driven to descend, so that the rubber extrusion ring 236 at the bottom of the outer protective mesh cover 234 is separated from the annular groove 235 at the top of the support rod 231, thereby realizing the separation of the outer protective mesh cover 234 from the sound pickup main body 232; The second driving mechanism 292 drives two waterproof covers 26 to close, forming a sealed cavity to protect the sound pickup main body 232. At the same time, when the two waterproof covers 26 move, they drive two sealing plates 28 to close the opening 221 at the top of the cleaning box body 22, preventing external dust from entering the cleaning box body 22 through the opening 221; At this time, the atomizing nozzle 251 sprays the cleaning agent, and the air blowing pipe 252 synchronously outputs compressed air to form a gas-liquid mixed eddy current to clean the outer protective mesh cover 234. The cleaned sound pickup component 23 is dried in the cleaning box body 22. After drying, the electric push rod 24 extends, pushing the sound pickup main body 232 to be re-clamped with the outer protective mesh cover 234, so that the rubber extrusion ring 236 is embedded in the annular groove 235, making the sound pickup component 23 in a standby state.

[0038] When a single group of sound pickup components 23 enters the cleaning process, the sound pickup stops. At this time, the electric push rod 24 of the adjacent cleaning box body 22 pushes the standby sound pickup component 23 to rise to the working position for sound pickup work. Multiple groups of sound pickup components 23 realize synchronous transmission of detection data through the signal antenna 212, and the data stream received by the monitoring center is not interrupted.

[0039] An analysis method of a noise detector using spectrogram analysis, the analysis method includes the following steps: S1: Environmental noise detection stage The electric push rod 24 pushes the sound pickup component 23 to rise to the external working position of the cleaning box body 22. At this time, the outer protective mesh cover 234 plays an effective role in protecting and dust-proofing the sound pickup main body 232; The pickup body 232 is used to collect ambient sound wave signals. The sound spectrum analysis module is responsible for converting the analog sound signals collected by the pickup component 23 into digital signals, generating a spectrogram through Fourier transform, analyzing the frequency components and energy distribution of the sound, and then transmitting the detection data to the monitoring center; S2: Blockage degree calculation stage of the outer protective mesh cover 234 Under the clean state of the outer protective mesh cover 234, the reference spectrum and sound pressure level of the pickup body 232 are recorded by the sound spectrum analysis module, and the reference signal is stored as a comparison reference; When the detector is working, the real-time acoustic signals of the pickup body 232 are continuously collected, a real-time spectrum is generated through fast Fourier transform, and compared with the reference spectrum; Pay attention to the attenuation situation in the high-frequency band. Blockage will cause the attenuation of high-frequency sound waves to intensify. Calculate the spectrum deviation index or the change amount of the signal-to-noise ratio, and judge the blockage degree according to the preset threshold; S3: Automatic cleaning stage When it is detected that the blockage degree of the outer protective mesh cover 234 exceeds the threshold or the cumulative working duration reaches the preset value: The electric push rod 24 drives the pickup component 23 to descend into the cleaning box body 22; The driving component 29 drives the two arc-shaped blocks 27 to move towards each other, and the two arc-shaped blocks 27 are used to fix the outer protective mesh cover 234. At this time, if the pickup body 232 is continuously driven to descend, the pickup body 232 will be separated from the outer protective mesh cover 234. Then, the driving component 29 is used to drive the two waterproof covers 26 to move towards each other again, so that the two waterproof covers 26 are closed to seal and waterproof the pickup body 232; Then, the atomizing nozzle 251 is opened to spray a special cleaning agent towards the outer protective mesh cover 234, and the air blowing pipe 252 synchronously outputs compressed air to form a gas-liquid mixed eddy current to complete the deep cleaning of the surface and pores of the mesh cover; S4: Working component switching stage When a single pickup component 23 enters the cleaning process, the electric push rod 24 of the adjacent cleaning box body 22 pushes another pickup component 23 to rise to the working position; The pickup component 23 that has been cleaned is dried in the cleaning box body 22. When the working pickup component 23 needs to be cleaned, the electric push rod 24 is used to drive the pickup body 232 to dock with the outer protective mesh cover 234 that has been cleaned, and then rise to the working position again, so as to realize the free switching of the two pickup components 23.

[0040] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A noise detector using sound spectrum analysis, comprising a support unit (1) and a detection unit (2), characterized in that, The detection unit (2) is installed at the top of the support unit (1) and is used to detect the ambient noise decibel level in the vicinity. The detection unit (2) includes a detection box body (21), a cleaning box body (22), a sound pickup assembly (23), an electric push rod (24), a cleaning unit (25) and a driving assembly (29). The detection box body (21) is internally provided with a sound spectrum analysis module. The cleaning box body (22) is optionally arranged outside the detection box body (21). The sound pickup assembly (23) is optionally arranged on the top or inside of the cleaning box body (22). The sound pickup assembly (23) includes a sound pickup main body (232) and an outer protective mesh cover (234). The outer protective mesh cover (234) is sleeved outside the sound pickup main body (232). The electric push rod (24) is fixedly installed inside the cleaning box body (22), and the top of the output shaft of the electric push rod (24) is fixedly connected to the bottom of the sound pickup assembly (23). The cleaning unit (25), a waterproof cover (26) and an arc-shaped clamping block (27) are all arranged inside the cleaning box body (22). The driving assembly (29) can drive the waterproof cover (26) and the arc-shaped clamping block (27) to move horizontally. The electric push rod (24) can be used to make the sound pickup assembly (23) enter and exit the cleaning box body (22). When the sound pickup assembly (23) enters the cleaning box body (22), the driving assembly (29) and the arc-shaped clamping block (27) are used to separate the sound pickup main body (232) from the outer protective mesh cover (234). Then, the cleaning unit (25) is used to clean the outer protective mesh cover (234). At the same time, the driving assembly (29) cooperates with the waterproof cover (26) to waterproof the sound pickup main body (232), thereby realizing the automatic cleaning work of the sound pickup assembly (23). By using multiple groups of cleaning box bodies (22) and multiple groups of sound pickup assemblies (23), the switching between the work and cleaning of different sound pickup assemblies (23) can be realized.

2. A noise detector using sound spectrum analysis according to claim 1, characterized in that, The support unit (1) includes a support rod (11), a first clamp (12) and a second clamp (13). The support rod (11) is fixedly installed at the detection position through embedded bolts. The first clamp (12) and the second clamp (13) are respectively sleeved outside the support rod (11). The first clamp (12) is used to install the detection box body (21). The second clamp (13) is connected to a display screen (3). An alarm (211) and a signal antenna (212) are fixedly installed on the top of the detection box body (21).

3. The noise detector using sound spectrum analysis according to claim 1, characterized in that, The pickup component (23) further includes a support rod (231) and an inner protective net cover (233). The pickup main body (232) is fixedly installed at the top of the support rod (231). The inner protective net cover (233) is sleeved outside the pickup main body (232). The bottom end of the outer protective net cover (234) is clamped with the outside of the top of the support rod (231). The outer protective net cover (234) is located outside the inner protective net cover (233). And a limiting convex ring (237) is fixedly connected to the outside of the bottom end of the outer protective net cover (234). An arc-shaped clamping groove (271) adapted to the limiting convex ring (237) is formed on the side surface of the arc-shaped clamping block (27).

4. The noise detector using sound spectrum analysis according to claim 3, characterized in that, An annular groove (235) is formed on the outside of the top end of the support rod (231). A rubber extrusion ring (236) is fixedly connected to the inner wall of the bottom of the outer protective net cover (234). And the rubber extrusion ring (236) is adapted to the annular groove (235). The bottom end of the support rod (231) is fixedly connected with a base (238). And the base (238) is connected to the output shaft of the electric push rod (24).

5. The noise detector using acoustic spectrum analysis according to claim 1, characterized in that The cleaning unit (25) consists of an atomizing nozzle (251) and a blowing pipe (252). The atomizing nozzle (251) and the blowing pipe (252) are both inclined and arranged inside the cleaning box body (22). The atomizing nozzle (251) sprays cleaning liquid towards the outer protective net cover (234) and cooperates with the blowing pipe (252) to blow air, thereby realizing the cleaning of the outer protective net cover (234).

6. The noise detector using sound spectrum analysis according to claim 4, characterized in that, An opening (221) adapted to the base (238) is formed at the top of the cleaning box body (22). Two sealing plates (28) are symmetrically and slidably arranged on the inner top wall of the cleaning box body (22). The two sealing plates (28) can be used to open or seal the opening (221). A sealing ring (222) is installed inside the cleaning box body (22). And the inner ring of the sealing ring (222) is adapted to the base (238).

7. A noise detector using acoustic spectrum analysis according to claim 6, characterized in that, The driving component (29) includes a first driving mechanism (291) and a second driving mechanism (292). The first driving mechanism (291) is connected to the two arc-shaped clamping blocks (27). The first driving mechanism (291) is used to realize the relative movement of the two arc-shaped clamping blocks (27). The second driving mechanism (292) is connected to the two waterproof covers (26) and the two sealing plates (28). The second driving mechanism (292) is used to realize the relative movement of the two waterproof covers (26) and the relative movement of the two sealing plates (28).

8. A noise detector using acoustic spectrum analysis according to claim 7, characterized in that, The first driving mechanism (291) includes a first driving motor (2911), a first belt transmission member (2912) and a first bidirectional lead screw (2913). The first driving motor (2911) is fixedly installed on the back of the cleaning box body (22). The first bidirectional lead screw (2913) is rotatably arranged inside the cleaning box body (22), and the first belt transmission member (2912) is installed between the end of the output shaft of the first driving motor (2911) and the end of the first bidirectional lead screw (2913). Two first nut blocks (2914) are symmetrically and threadedly connected to both sides of the first bidirectional lead screw (2913). Both of the two first nut blocks (2914) are slidably connected to the inner wall of the cleaning box body (22), and the two first nut blocks (2914) are respectively fixedly connected to two arc-shaped clamping blocks (27).

9. The noise detector using sound spectrum analysis according to claim 7, wherein The second driving mechanism (292) includes a second driving motor (2921), a second belt transmission member (2922) and a second bidirectional lead screw (2923). The second driving motor (2921) is fixedly installed on the back of the cleaning box body (22). The second bidirectional lead screw (2923) is rotatably arranged inside the cleaning box body (22), and the second belt transmission member (2922) is installed between the end of the output shaft of the second driving motor (2921) and the end of the second bidirectional lead screw (2923). Two second nut blocks (2924) are symmetrically and threadedly connected to both sides of the second bidirectional lead screw (2923). Both of the two second nut blocks (2924) are slidably connected to the inner wall of the cleaning box body (22), and the two second nut blocks (2924) are respectively fixedly connected to two waterproof covers (26). A connecting strip (2925) is fixedly connected between the waterproof cover (26) and the sealing plate (28) on the same side.

10. The analysis method of a noise detector using acoustic spectrum analysis according to any one of claims 1-9, characterized in that, The analysis method includes the following steps: S1: Environmental noise detection stage The electric push rod (24) pushes the sound pickup assembly (23) up to the external working position of the cleaning box body (22). At this time, the outer protective net cover (234) plays an effective role in protecting and dust-proofing the sound pickup main body (232). The environmental sound wave signal is collected by the sound pickup main body (232). The sound spectrum analysis module is responsible for converting the analog sound signal collected by the sound pickup assembly (23) into a digital signal, generating a spectrogram through Fourier transform, analyzing the frequency components and energy distribution of the sound, and then transmitting the detection data to the monitoring center. S2: Blockage degree calculation stage of the outer protective net cover (234) In the clean state of the outer protective net cover (234), the reference spectrum and sound pressure level of the sound pickup main body (232) are recorded by the sound spectrum analysis module, and the reference signal is stored for comparison reference. When the detector is working, the real-time acoustic signal of the sound pickup main body (232) is continuously collected, and a real-time spectrum is generated through fast Fourier transform and compared with the reference spectrum. Pay attention to the attenuation situation in the high-frequency band. Blockage will cause the high-frequency sound wave attenuation to intensify. Calculate the spectrum deviation index or the change amount of the signal-to-noise ratio, and judge the blockage degree according to the preset threshold. S3: Automatic cleaning stage When it is detected that the clogging degree of the outer protective mesh cover (234) exceeds the threshold value or the cumulative working duration reaches the preset value: The electric push rod (24) drives the sound pickup component (23) to descend into the cleaning box body (22); The driving component (29) drives the two arc-shaped clamping blocks (27) to move towards each other, and the outer protective mesh cover (234) is fixed by the two arc-shaped clamping blocks (27). At this time, if the sound pickup body (232) is continuously driven to descend, the sound pickup body (232) will be separated from the outer protective mesh cover (234). Then, the driving component (29) is used again to drive the two waterproof covers (26) to move towards each other, so that the two waterproof covers (26) are closed to seal and waterproof the sound pickup body (232); Then the atomizing nozzle (251) is turned on to spray a special cleaning agent towards the outer protective mesh cover (234), and the air blowing pipe (252) outputs compressed air synchronously to form a gas-liquid mixed eddy current to complete the deep cleaning of the surface and pores of the mesh cover; S4: Working component switching stage When a single group of sound pickup components (23) enters the cleaning process, the electric push rod (24) of the adjacent cleaning box body (22) pushes another sound pickup component (23) to rise to the working position; The sound pickup component (23) that has completed cleaning is dried in the cleaning box body (22). When the working sound pickup component (23) needs to be cleaned, the electric push rod (24) is used to drive the sound pickup body (232) to dock with the outer protective mesh cover (234) that has completed cleaning, and then it rises to the working position again, thereby realizing the free switching of the two sound pickup components (23).

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