Dust monitoring and cleaning system and cleaning control method thereof

Abstract

The application belongs to the technical field of industrial dust explosion safety prevention and control, and particularly relates to a dust monitoring and cleaning system and a cleaning control method thereof, the dust monitoring and cleaning system comprising a shell, a sampling module, a sensing module, a self-cleaning module, a regional cleaning module and a control module. The control module is configured to determine the dust deposition thickness according to the frequency signal sent by the sensing module, and control the self-cleaning module to clean the sensing module when the dust deposition thickness is not less than a first threshold value, and control the regional cleaning module to clean the region to be monitored when the dust deposition thickness is not less than a second threshold value. Based on the interaction among the self-cleaning module, the regional cleaning module and the control module, the maintenance-free operation and the measurement accuracy persistence of the sensing module in the harsh industrial environment are ensured, the dust monitoring and cleaning system realizes the leap from 'perception' to 'execution', and the intelligent, active and closed-loop safety barrier is formed.

Description

Technical Field

[0001] This application belongs to the field of industrial dust explosion safety prevention and control technology, and in particular relates to a dust monitoring and cleaning system and its cleaning control method. Background Technology

[0002] In many industrial sectors such as coal, grain, and metal processing, dust accumulation, especially in areas where dust removal pipes, combustion furnaces, and flues are located, is a major risk source for dust explosions. Effective monitoring and timely cleaning are crucial.

[0003] The existing monitoring methods mainly include: (1) offline weighing, which involves manually collecting dust samples and weighing them in the laboratory. Although the data is accurate, it cannot achieve online early warning, has poor timeliness, and requires a large workload; (2) online suspended dust concentration meter, which is based on the principles of light scattering and beta rays. This method can only monitor the concentration of suspended dust in the air and cannot directly quantify the more critical risk indicator of ground-deposited dust; (3) sedimentary dust monitoring devices, which mostly adopt a passive waiting method for settling, have a very small monitoring range, and are not suitable for monitoring large areas. In addition, the devices used in the above monitoring methods only provide monitoring functions and do not have self-cleaning functions or monitoring area cleaning functions, which cannot form an effective risk prevention and control closed loop, and the monitoring area still has a large risk. Summary of the Invention

[0004] This application aims to provide a dust monitoring and cleaning system and its cleaning control method, which achieves an effective closed loop of risk prevention and control, and greatly reduces the safety risks in the monitoring area.

[0005] This application provides a dust monitoring and cleaning system, comprising: a housing; a sampling module disposed within the housing for introducing dust-laden airflow from a monitored area into the housing; a sensing module disposed within the housing for generating a frequency signal based on the dust-laden airflow; a self-cleaning module disposed within the housing for cleaning the sensing module; a zone cleaning module disposed outside the housing; and a control module connected to the sampling module, the sensing module, the self-cleaning module, and the zone cleaning module. The control module is configured to determine the dust deposition thickness based on the frequency signal sent by the sensing module, and to control the self-cleaning module to clean the sensing module when the dust deposition thickness is not less than a first threshold, and to control the zone cleaning module to clean the monitored area when the dust deposition thickness is not less than a second threshold, wherein the first threshold is less than the second threshold.

[0006] In an optional embodiment of this application, the sensing module includes at least a sensor, which comprises a quartz crystal, a metal electrode, and an oscillation circuit. The metal electrode is used to apply an alternating electric field within the housing, allowing the quartz crystal to resonate under this field. The oscillation circuit acquires the frequency signal of the quartz crystal in real time and outputs it to the control module.

[0007] In an optional embodiment of this application, the sensing module further includes a temperature and humidity sensor, which is disposed within the housing and used to monitor environmental data within the housing. The control module is also connected to the temperature and humidity sensor and uses the environmental data monitored by the sensor to correct the frequency signal output by the oscillation circuit.

[0008] In an optional embodiment of this application, the self-cleaning module includes a piezoelectric vibrator, multiple pulsed airflow nozzles, and multiple control components. The piezoelectric vibrator is disposed below the sensing module, the multiple pulsed airflow nozzles are spaced apart and arranged around the outside of the sensing module, and the multiple control components are correspondingly arranged one-to-one with the multiple pulsed airflow nozzles. The control module connects the piezoelectric vibrator and the control components, and is used to control the piezoelectric vibrator to generate vibrations and the control components to control the corresponding pulsed airflow nozzles to spray airflow to clean the sensing module.

[0009] In an optional embodiment of this application, the sampling module includes a dustproof grille, an airflow guide ring, a settling component, and a centrifugal fan. The dustproof grille, airflow guide ring, and settling component are sequentially arranged within the housing, with the dustproof grille located at the end of the housing. The airflow guide ring is spaced apart from the dustproof grille and has a central through-hole and multiple guide holes located outside the central through-hole. One end of the settling component abuts against the airflow guide ring, and the other end abuts against the sensing module, forming a settling chamber communicating with the central through-hole of the airflow guide ring. The centrifugal fan is disposed within the housing and communicates with the outside of the housing via the multiple guide holes and the dustproof grille to introduce dust-laden airflow from the area to be monitored into the housing. The sensing module can collect dust from the dust-laden airflow through the settling chamber and the central through-hole.

[0010] In an optional embodiment of this application, the control module includes a main control board, a power supply and communication board, and a rechargeable battery. The rechargeable battery powers the main control board, the sampling module, the sensing module, and the self-cleaning module. The main control board is connected to the power supply and communication board, the sampling module, the sensing module, and the self-cleaning module. The power supply and communication board is communicatively connected to the area cleaning module and is used to send an area cleaning trigger signal to the area cleaning module when the deposition thickness is not less than a second threshold.

[0011] A second aspect of this application provides a cleaning control method configured in the aforementioned dust monitoring and cleaning system, comprising: controlling the operation of the sampling module to introduce dust-laden airflow from the area to be monitored into the housing; receiving a frequency signal generated by the sensing module based on the dust-laden airflow, and calculating the dust deposition thickness deposited on the sensing module according to the frequency signal; controlling the self-cleaning module to clean the sensing module when the dust deposition thickness is not less than a first threshold; and controlling the area cleaning module to clean the area to be monitored when the dust deposition thickness is not less than a second threshold.

[0012] In an optional embodiment of this application, the step of calculating the dust deposition thickness on the sensing module based on the frequency signal includes: determining the natural frequency of the quartz wafer based on the thickness, reinforcing elastic coefficient, and crystal density of the quartz wafer; determining the change in mass per unit area of ​​the quartz wafer caused by the dust deposition based on the natural frequency, frequency drift, and mass of the quartz wafer; and determining the dust deposition thickness based on the change in mass per unit area of ​​the quartz wafer caused by the dust deposition, the dust deposition density, and the area of ​​the region to be monitored.

[0013] In an optional embodiment of this application, before calculating the dust deposition thickness on the sensing module based on the frequency signal, the cleaning control method further includes: correcting the frequency signal based on environmental data within the housing.

[0014] In an optional embodiment of this application, before calculating the dust deposition thickness on the sensing module based on the frequency signal, the cleaning control method further includes: correcting the sensitivity of the sensor based on the frequency drift.

[0015] In an optional embodiment of this application, the self-cleaning module includes a piezoelectric vibrator, multiple pulsed airflow nozzles, and multiple control components. Controlling the self-cleaning module to clean the sensing module includes: controlling the piezoelectric vibrator to vibrate; after a first period of vibration of the piezoelectric vibrator, controlling the control components to open the pulsed airflow nozzles; and controlling the control components to compress the air inside the housing and spray airflow towards the sensing module through the pulsed airflow nozzles to clean the sensing module.

[0016] In summary, the solution provided in this application has at least the following beneficial effects:

[0017] In the dust monitoring and cleaning system provided in this application, through the interaction between the sampling module, sensing module, self-cleaning module, area cleaning module, and control module, active sampling can be achieved based on the sampling module, highly reliable online monitoring based on the sensing module, system self-maintenance based on the self-cleaning module, and cleaning of the monitored area through the area cleaning module. Furthermore, since the sensing module is the core module of the system, the control module determines the dust deposition thickness by inversely using the frequency signal sent by the sensing module. This allows for timely cleaning of the sensing module based on the dust deposition thickness, ensuring maintenance-free operation and continuous measurement accuracy of the sensing module in harsh industrial environments. Additionally, the second-level area cleaning maintenance constructed by the area cleaning module transforms monitoring data into direct safety control actions. Combined with the first-level self-cleaning maintenance constructed by the self-cleaning module, this achieves a leap from "perception" to "execution," seamlessly integrating online monitoring of deposited dust with risk management processes, forming an intelligent, proactive, and closed-loop safety barrier. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the specific embodiments of this application, the drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a perspective view of the dust monitoring and cleaning system provided according to an embodiment of this application;

[0020] Figure 2 for Figure 1 A partial cross-sectional diagram of the dust monitoring and cleaning system in the image;

[0021] Figure 3 for Figure 1 A cross-sectional schematic diagram of the dust monitoring and cleaning system in the diagram;

[0022] Figure 4This is a schematic flowchart of a cleaning control method provided according to an embodiment of this application.

[0023] The attached icons are numbered as follows:

[0024] 100. Dust monitoring and cleaning system;

[0025] 1. Shell; 11. Main body; 111. Body section; 112. Inspection hatch; 12. Base; 13. Status indicator light ring;

[0026] 2. Sampling module; 21. Dustproof grille; 22. Airflow guide ring; 221. Guide hole; 222. Central through hole; 23. Settling component; 231. Settling chamber; 24. Centrifugal fan; 25. Sampling gap;

[0027] 3. Sensing module; 31. Sensor; 32. Humidity sensor;

[0028] 4. Self-cleaning module; 41. Piezoelectric vibrator; 42. Pulsed airflow nozzle; 43. Multiple control components;

[0029] 5. Area cleaning module;

[0030] 6. Control module; 61. Main control board; 62. Power supply and communication board; 63. Rechargeable battery;

[0031] 7. Connecting terminals. Detailed Implementation

[0032] To make the above and other features and advantages of this application clearer, the application is further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art and are exemplary only, not restrictive.

[0033] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects.

[0034] Figure 1 This is a perspective view of the dust monitoring and cleaning system provided according to an embodiment of this application. Figure 2 for Figure 1 A partial cross-sectional diagram of the dust monitoring and cleaning system in the diagram. Figure 3 for Figure 1 A cross-sectional schematic diagram of the dust monitoring and cleaning system in the image.

[0035] The dust monitoring and cleaning system 100 of this application is placed in the area to be monitored. It can self-clean and / or clean the area to be monitored based on the monitoring results, ensuring not only its own monitoring accuracy but also avoiding safety risks caused by long-term dust accumulation in the monitored area (such as health risks to workers, environmental pollution risks, and explosion risks). Specifically, the monitored area can be a key risk area in many industrial sectors such as coal, grain, and metal processing, such as dust collection and treatment areas (e.g., areas containing dust collection pipes, combustion furnaces, and flues).

[0036] In other words, whether it is preventing gas and dust explosions in the coal industry, dust risks in grain processing, or combustible metal dust generated in metal processing, this dust monitoring and cleaning system 100 can effectively monitor and clean up key risk areas in various industries. That is, by constructing an intelligent closed loop from risk perception to automatic handling, it provides a unified and reliable technical guarantee for safe production in different industries, thereby greatly reducing the safety risks in key risk areas of various industries.

[0037] See Figures 1 to 3 The dust monitoring and cleaning system 100 may include a housing 1, a sampling module 2, a sensing module 3, a self-cleaning module 4, a zone cleaning module 5, and a control module 6.

[0038] The housing 1 is used to be installed in the area to be monitored and to provide installation space for the sampling module 2, the sensing module 3, and the self-cleaning module 4. The housing 1 can be an integral structure or a split structure, and this application does not limit it in this regard. Specifically, the area to be monitored can be a dust removal duct, a combustion furnace, a flue, etc., that is, the housing 1 can be connected to the dust removal duct, the combustion furnace, the flue, etc.

[0039] Sampling module 2 is housed within housing 1 and is used to actively introduce dust-laden airflow from the area to be monitored into housing 1 under the control of control module 6, thereby achieving active sampling of the monitored area. The active sampling time and frequency of sampling module 2 can be reasonably set according to the area of ​​the monitored area and / or the dust deposition situation, such as sampling periodically at a certain frequency.

[0040] The sensing module 3 is housed within the housing 1 and located below the sampling module 2. It collects dust from the dust-laden airflow and, under the control of the control module 6, generates a frequency signal based on the dust accumulation in the airflow. Specifically, the sensing module 3 can convert changes in dust mass into a frequency signal.

[0041] The self-cleaning module 4 is located inside the housing 1 and is used to clean the sensing module 3 under the action of the control module 6. The area cleaning module 5 is located outside the housing 1 and is used to clean the area to be monitored under the action of the control module 6.

[0042] Specifically, the area cleaning module 5 can be a dust removal device connected to a dust removal duct to clean the dust in the duct, a dust removal device connected to a combustion furnace to clean the dust inside the combustion furnace, or a dust removal device connected to a flue to clean the dust inside the flue. Furthermore, the dust removal equipment includes, but is not limited to, sweeping equipment, ventilation dust removal equipment, and spraying equipment.

[0043] The control module 6 connects (e.g., via communication or electrical connections) the sampling module 2, the sensing module 3, the self-cleaning module 4, and the area cleaning module 5. The control module 6 can be located inside or outside the housing 1 (e.g., integrated into the area cleaning module 5).

[0044] The control module 6 is configured to determine the dust deposition thickness based on the frequency signal sent by the sensing module 3, and to control the self-cleaning module 4 to clean the sensing module 3 when the dust deposition thickness is not less than the first threshold, and to control the area cleaning module 5 to clean the area to be monitored when the dust deposition thickness is not less than the second threshold.

[0045] In this scenario, if the first threshold is less than the second threshold, the cleaning process of the self-cleaning module 4 on the sensing module 3 can be termed the first-level self-cleaning maintenance, while the cleaning process of the area cleaning module 5 on the area to be monitored can be termed the second-level area cleaning maintenance. The combination of these two processes forms a two-level response intelligent control closed-loop mode. Specifically, the first and second thresholds can be reasonably set according to the monitoring needs of different monitoring areas.

[0046] In this dust monitoring and cleaning system 100, through the interaction between the sampling module 2, the sensing module 3, the self-cleaning module 4, the area cleaning module 5, and the control module 6, active sampling can be achieved based on the sampling module 2; highly reliable online monitoring can be achieved based on the sensing module 3; system self-maintenance can be achieved based on the self-cleaning module 4; and cleaning of the monitored area can be achieved through the area cleaning module 5. Furthermore, since the sensing module 3 is the core module of the system, the control module 6 determines the dust deposition thickness by using the frequency signal sent by the sensing module 3. Based on the dust deposition thickness, the control module 6 can clean the sensing module 3 in a timely manner, thus ensuring the maintenance-free operation and continuous measurement accuracy of the sensing module 3 in harsh industrial environments. In addition, since the second-level area cleaning maintenance constructed by the area cleaning module 5 transforms monitoring data into direct safety control actions, its combination with the first-level self-cleaning maintenance constructed by the self-cleaning module 4 achieves a leap from "perception" to "execution," truly seamlessly connecting the online monitoring and risk management process of deposited dust, forming an intelligent, proactive, and closed-loop safety barrier.

[0047] In some embodiments, see Figure 1The housing 1 may include a main body 11 and a base 12. One end (i.e. the top) of the main body 11 is used to install the sampling module 2, while the end away from the sampling module 2 (i.e. the bottom) is fixedly installed on the base 12. The main body 11 and the base 12 together form an installation space for accommodating the sampling module 2, the sensing module 3, and the self-cleaning module 4.

[0048] Specifically, the main body 11 can be cylindrical, square, or other shaped structures. The main body 11 can be made of flame-retardant ABS engineering plastic with an IP65 protection rating. The base 12 is located at the bottom of the main body 11. The base 12 can be made of galvanized steel sheet and can have four neodymium iron boron permanent magnets built in it. It is provided with threaded holes so that it can be magnetically attracted and / or bolted to the ground to fix the dust monitoring and cleaning system 100.

[0049] In some embodiments, see Figure 2 and Figure 3 The sampling module 2 may include a dustproof grille 21, an airflow guide ring 22, a settling component 23, and a centrifugal fan 24.

[0050] The dustproof grille 21 is located at the end of the housing 1 away from the base 12, and the dustproof grille 21, the airflow guide ring 22, and the settling member 23 are arranged sequentially from top to bottom inside the housing 1.

[0051] The airflow guide ring 22 is spaced apart from the dustproof grille 21 to form a sampling gap 25. The airflow guide ring 22 is provided with a central through hole 222 and multiple guide holes 221 located outside the central through hole 222. The central through hole 222 and the multiple guide holes 221 are all connected to the sampling gap 25.

[0052] One end of the settling member 23 abuts against the airflow guide ring 22, and the other end abuts against the sensing module 3. That is, the sensing module 3 is located on the lower side of the settling member 23. The settling member 23 forms a settling chamber 231 that communicates with the central through hole 222 of the airflow guide ring 22.

[0053] Centrifugal fan 24 is installed inside housing 1 and communicates with the outside of housing 1 through multiple guide holes 221 and dustproof grid 21 to introduce dust-laden airflow in the area to be monitored into sampling gap 25 of housing 1. Sensing module 3 can collect dust in dust-laden airflow in sampling gap 25 through settling chamber 231 and central through hole 222.

[0054] It should be noted that when the centrifugal fan 24 is started for active sampling, the centrifugal fan 24 can be controlled to run at a low speed. This can form a stable upward airflow at the top of the housing 1. The surrounding dust-laden air can be drawn into the housing 1 at a speed of 0.1-0.3 m / s under the action of the upward airflow. After being initially filtered by the dustproof grille 21, some of the dust in the dust-laden airflow is deposited due to gravity and inertia when it flows through the central area of ​​the sampling gap 25. It then falls into the settling chamber 231 through the central through hole 222 of the airflow guide ring 22 and is finally deposited on the sensing module 3.

[0055] In this embodiment, based on the cooperation of the dustproof grille 21, the airflow guide ring 22, the settling component 23, and the centrifugal fan 24, active airflow can guide sampling, making the monitoring results more representative of the overall dust deposition status of the surrounding area and overcoming the localization and randomness of passive monitoring. Therefore, the dust monitoring and cleaning system 100 of this application expands the sampling range and can be applied to the monitoring of larger areas.

[0056] In some embodiments, see Figure 2 and Figure 3 The cross-sectional area of ​​the settling member 23 decreases from top to bottom, meaning that the settling member 23 is formed into an inverted cone shape. Furthermore, for ease of observation, the settling member 23 can be made of transparent polycarbonate plastic.

[0057] With this configuration, when dust in the dust-laden airflow enters from the larger top cross-section of the settling member 23 and flows downwards, the dust velocity gradually increases as the channel cross-sectional area continuously decreases. This increased velocity generates a stronger downward inertial force on the dust, driving it downwards. Furthermore, the conical structure guides the dust towards the center, reducing the possibility of dust stagnation at the corners, making it easier for the dust to be "gathered" and pushed towards the bottom outlet for deposition on the sensing module 3, thereby accelerating deposition efficiency (i.e., sampling efficiency).

[0058] In some embodiments, the centrifugal fan 24 adopts a DC brushless motor, the rated wind speed of the centrifugal fan 24 is adjustable and can be 0.2 m / s, and a control module 6 can be installed on the lower side of the centrifugal fan 24.

[0059] In some embodiments, the sensing module 3 includes at least a sensor 31, which can be a quartz crystal microbalance (QCM) to utilize the inverse piezoelectric effect of quartz crystals to convert the mass change of quartz crystals caused by dust into a frequency signal, thereby achieving real-time, high-precision inversion of dust deposition thickness. Specifically, see [link to relevant documentation]. Figure 2 and Figure 3 The sensor 31 may include a quartz crystal, metal electrodes, and an oscillation circuit.

[0060] Quartz wafers can be made from circular AT-cut quartz crystals with a diameter of about ten millimeters (e.g., 14 mm). The chemical composition of AT-cut quartz crystals includes silicon dioxide, which has piezoelectric properties, anisotropy, and good frequency-temperature characteristics.

[0061] The metal electrodes typically include positive and negative electrodes, which are respectively disposed on both sides of the quartz crystal. The metal electrodes are used to apply an alternating electric field inside the housing 1. The quartz crystal can deform under the alternating electric field to generate a resonant vibration sound wave. The oscillation circuit can collect the frequency signal of the resonant vibration of the quartz crystal in real time and output it to the control module 6.

[0062] In this embodiment, the sensing module 3 utilizes the inverse piezoelectric effect of the quartz crystal to convert the mass change caused by dust on the quartz crystal into a resonant frequency drift signal. The control module 6 performs thickness inversion based on the mass-frequency response relationship of the quartz crystal to determine the dust deposition thickness in real time, thereby improving the accuracy of dust deposition measurement. Furthermore, when the dust deposition thickness reaches a first threshold (i.e., the sensor self-cleaning threshold), the dust monitoring and cleaning system 100 activates the self-cleaning module 4 to efficiently remove dust from the surface of the sensor 31, thereby ensuring the long-term accuracy of the sensor 31.

[0063] In other words, this application constructs a non-contact, highly sensitive deposition quality-thickness inversion mechanism based on the resonant frequency method of a quartz crystal microbalance (QCM), providing accurate data with sensitivity down to the nanogram level. Furthermore, it should be noted that when the thickness of the quartz crystal is an integer multiple of half the wavelength of the acoustic wave, a stable standing wave can be formed. In this case, the quality-frequency response relationship of the quartz crystal can be determined based on the natural frequency of the acoustic wave.

[0064] In some embodiments, see Figure 2 and Figure 3 The sensing module 3 may also include a temperature and humidity sensor 32 (which may be a digital sensor, such as SHT35). The temperature and humidity sensor 32 is disposed inside the housing 1 and close to the sampling module 2, and is used to monitor environmental data (i.e., temperature and humidity) inside the housing 1. The control module 6 is also connected to the temperature and humidity sensor 32 and uses the environmental data monitored by the temperature and humidity sensor 32 to correct the frequency signal output by the sensor 31.

[0065] Specifically, the control module 6 synchronously reads the monitoring data from the temperature and humidity sensor 32 and uses a pre-stored temperature-frequency compensation model to correct the frequency signal output by the sensor 31 in order to eliminate environmental interference.

[0066] Therefore, based on the temperature and humidity sensor 32 and the temperature and humidity self-compensation mechanism embedded in the control module 6 (humidity range 0–100% RH, temperature range -40–125℃), the dust monitoring and cleaning system 100 supports online operation in dynamic humid and hot environments, and achieves dynamic tracking of resonant frequency drift based on PID filtering and FFT transformation.

[0067] In some embodiments, the sensor 31 may be in a standard TO-8 metal package with a base frequency of 10MHz. The surface of the sensor 31 of the sensing module 3 is covered with a replaceable protective film, which may be a polytetrafluoroethylene (PTFE) nanoporous dust-repellent protective film.

[0068] In some embodiments, see Figure 1 The main body 11 may include a body portion 111 and a maintenance door 112. The body portion 111 has an opening formed on the portion near the base 12, and the maintenance door 112 is disposed at the opening to close or open the opening. When the opening is opened through the maintenance door 112, the protective film on the surface of the sensor 31 can be replaced.

[0069] Furthermore, a status indicator ring 13 can be embedded in the upper side of the main body 111. The status indicator ring 13 is used to visually display the working status of the dust monitoring and cleaning system 100. Specifically, the status indicator ring 13 can be an RGB LED indicator ring.

[0070] For example, when the status indicator ring 13 is green, it indicates that the system is operating normally; when the status indicator ring 13 is yellow, it indicates that the system is in a warning state; when the status indicator ring 13 is red, it indicates that the system is in an alarm state; and when the status indicator ring 13 is blue, it indicates that the system is in a cleaning state.

[0071] In some embodiments, if the dust deposition thickness is below a first warning threshold (e.g., 30 μm), the dust monitoring and cleaning system 100 reports data normally, and the status indicator ring 13 on the housing 1 remains green. If the dust deposition thickness reaches a second warning threshold (i.e., the first threshold mentioned above, e.g., 50 μm), the status indicator ring 13 on the housing 1 flashes yellow, and the dust monitoring and cleaning system 100 sends a warning message to the upper-level system and simultaneously initiates a first-level response. If the dust deposition thickness reaches a third warning threshold (i.e., the second threshold mentioned above, e.g., 100 μm), the status indicator ring 13 on the housing 1 flashes red, and the dust monitoring and cleaning system 100 sends an alarm message to the upper-level system and simultaneously initiates a second-level response.

[0072] In some embodiments, see Figure 2 and Figure 3The self-cleaning module 4 may include: a piezoelectric vibrator 41, multiple pulse airflow nozzles 42, and multiple control components 43.

[0073] The piezoelectric vibrator 41 is located below the sensing module 3 and can be attached to the sensing module 3 with thermally conductive adhesive. The piezoelectric vibrator 41 can be a ring structure and made of piezoelectric ceramic material.

[0074] Multiple pulsed airflow nozzles 42 are spaced apart and arranged in a ring around the outside of the sensing module 3, such as four, six, eight, etc. Each pulsed airflow nozzle 42 can be made of stainless steel.

[0075] Multiple control components 43 are configured one-to-one with multiple pulse airflow nozzles 42, and each control component 43 is used to control a corresponding pulse airflow nozzle 42. Specifically, each control component 43 includes, but is not limited to, a control valve and an air pump. The control valve is used to control the opening or closing of the pulse airflow nozzle 42, and the air pump can be connected to the pulse airflow nozzle 42 through a hose and spray airflow through the pulse airflow nozzle 42.

[0076] The control module 6 connects the piezoelectric vibrator 41 and the control component 43, and is used to control the piezoelectric vibrator 41 to generate vibration and the control component 43 to spray airflow through the corresponding pulse airflow nozzle 42 to clean the sensing module 3.

[0077] In this embodiment, when the dust deposition thickness is not less than the first threshold, the control module 6 initiates the first-level response, that is, it sequentially activates the control valve of the piezoelectric vibrator 41 and the control component 43 to open the pulse airflow nozzle 42, so as to use the synergistic effect of vibration and airflow to completely remove the dust on the surface of the sensing module 3.

[0078] If the dust deposition thickness is not less than the first threshold, the second-level response is initiated, that is, the area to be monitored is thoroughly cleaned by the area cleaning module 5.

[0079] In some embodiments, see Figure 2 and Figure 3 The control module 6 may include a main control board 61, a power supply and communication board 62, and a rechargeable battery 63.

[0080] The main control board 61 is located below the piezoelectric vibrator 41 of the self-cleaning module 4. The main control board 61 is connected to the power supply and communication board 62, the sampling module 2, the sensing module 3 and the self-cleaning module 4, and is responsible for running active sampling, frequency measurement, thickness inversion, threshold judgment and related control algorithms.

[0081] Specifically, the main control board 61 is equipped with a high-precision frequency counter, which can achieve data acquisition at a frequency of up to 100Hz. When the sensor module 3 oscillates continuously, the resonant frequency signal generated by the sensor module 3 can be captured by the high-precision frequency counter on the main control board 61.

[0082] The power supply and communication board 62 is located below the main control board 61 and is communicatively connected to the area cleaning module 5. It is used to send an area cleaning trigger signal to the area cleaning module 5 when the dust deposition thickness is not less than a second threshold. Specifically, the power supply and communication board 62 may have a 1 Mbps industrial communication interface, supporting RS-485 dry contact signals, 4–20 mA analog signals, Modbus TCP, and Wi-Fi / NB-IoT wireless remote transmission protocols, adapting to SCADA systems or industrial cloud platforms.

[0083] The rechargeable battery 63 powers the main control board 61, sampling module 2, sensing module 3, and self-cleaning module 4. Specifically, the rechargeable battery 63 can be a rechargeable lithium battery pack with a capacity of 10000mAh and a power input interface. Furthermore, the dust monitoring and cleaning system 100 may also include a connection terminal 7, which is located on the housing 1 and at least partially exposed therefrom, for connecting the rechargeable battery 63 to an external power source and for connecting a dry contact output cable.

[0084] In some embodiments, the control module 6 may have a built-in ≥32 GB eMMC high-speed storage unit to support local storage and edge processing. The control module 6 may also be equipped with a fault self-diagnosis and standard source automatic calibration mechanism to ensure long-term online operational stability. The control module 6 may also integrate unit modules such as a power management unit, multiple relays (dry contact output), a current loop output chip, and a transceiver.

[0085] It should be noted that when the area cleaning module 5 needs to be activated for area cleaning, the main control board 61 can operate through the communication interface on the power supply and communication board 62: that is, controlling the relay contacts to close (dry contact signal), outputting a 4-20mA current proportional to the thickness, and sending a start command via the wireless network. These signals will trigger the pre-connected area cleaning module 5 (at least one of a sweeping robot, dust removal equipment, or spraying equipment) to start working and perform a comprehensive cleaning operation on the floor of that area.

[0086] In summary, the dust monitoring and cleaning system 100 of this application possesses advantages such as non-contact measurement, extremely high sensitivity, dynamic frequency response, and adaptability to complex environments. It can be deployed in typical dust deposition risk areas such as ventilation and dust removal ducts, flues, and dust accumulation dead corners in workshops, providing precise front-end sensing support for explosion and combustion prevention in industrial scenarios. Furthermore, the dust monitoring and cleaning system 100 of this application can achieve fully automated intelligent management of dust deposition on industrial sites, from "representative monitoring," "intelligent early warning," "self-maintenance," to "regional coordinated prevention and control," providing key technical equipment for building an active dust safety protection system. In addition, based on the cooperation between the control module 6 and other modules, the dust monitoring and cleaning system 100 of this application can automatically perform a self-calibration procedure periodically. By comparing with an internal frequency reference, it ensures measurement accuracy throughout its entire lifecycle, achieving dust deposition monitoring within a thickness range of 0.1-10μm and a concentration range of 1-100 mg / m³, with a measurement error of less than ±5% and a response time of less than 5 seconds.

[0087] Figure 4 This is a schematic flowchart of a cleaning control method provided according to an embodiment of this application. See also... Figure 4 The cleaning control method of this application is configured in the dust monitoring and cleaning system 100 described in any of the above embodiments. The cleaning control method of this application may include the following steps.

[0088] S101, control the operation of sampling module 2 to introduce dust-laden airflow into housing 1 from the area to be monitored.

[0089] S102, receive the frequency signal generated by the sensing module 3 based on the dust-laden airflow, and calculate the dust deposition thickness on the sensing module 3 according to the frequency signal.

[0090] S103, when the dust deposition thickness is not less than the first threshold, control the self-cleaning module 4 to clean the sensing module 3.

[0091] S104, when the dust deposition thickness is not less than the second threshold, the control area cleaning module 5 cleans the area to be monitored.

[0092] Here, the first and second thresholds form a multi-level threshold comparison mode. This application can achieve different levels of response actions by comparing the calculated dust deposition thickness with the preset multi-level thresholds. Of course, it is not limited to comparison with the first and second thresholds. For example, the first threshold can be 50 μm and the second threshold can be 100 μm.

[0093] In this embodiment, when the dust deposition thickness is not less than a first threshold, a first-level response is triggered: that is, the self-cleaning module 4 is controlled to clean the sensing module 3 to completely remove the dust from the surface of the sensing module 3. Furthermore, after cleaning, the frequency signal can be remeasured; if the cleaning standard is met, the self-cleaning is deemed successful, and the system is reset.

[0094] If the dust deposition thickness is not less than the second threshold, a second-level response is triggered: the area cleaning module 5 cleans the monitored area, performing a comprehensive cleaning operation on the ground of that area. Furthermore, after cleaning the area for a period of time (e.g., 15 minutes), the frequency signal can be remeasured and the dust deposition thickness recalculated. If the dust deposition thickness is detected to have dropped below the safe threshold (e.g., <20μm), the area cleaning is deemed effective, the indicator light returns to green, and a "cleaning complete" signal is reported via the communication interface. If the dust deposition thickness still does not meet the standard, an alarm can be triggered again or a new cleaning cycle can be started until the risk is eliminated.

[0095] This application integrates a first-level response (sensor self-cleaning) and a second-level response (area cleaning) mode. Self-cleaning ensures the long-term stability of the monitoring body sensor module 3, while area cleaning transforms risk warnings into substantial prevention and control actions, solving the industry pain point of "only alarming but not taking action".

[0096] It should be noted that after the self-cleaning module 4 cleans the sensing module 3, the cleaning effect of the self-cleaning module 4 can be inspected until the cleaning effect meets the cleaning standard. Similarly, after the area cleaning module 5 cleans the area to be monitored, the cleaning effect of the area cleaning module 5 can be inspected until the safety standard is met.

[0097] In some embodiments, calculating the dust deposition thickness on the sensing module 3 based on the frequency signal may specifically include the following steps S201-S203.

[0098] S201, based on the thickness of the quartz wafer of sensor 31 , Enhanced elasticity coefficient and crystal density Determine the natural frequency of the quartz crystal. .

[0099] Specifically, the thickness is calculated based on the mass-frequency response principle of the quartz crystal in sensor 31: when the quartz crystal deforms and generates sound waves in an alternating electric field, the thickness of the quartz crystal... Wavelength of sound wave A stable standing wave is formed when the frequency is a multiple of half of the integer value; at this point, the natural frequency of the quartz crystal is... It can be given by formula (1):

[0100] (1).

[0101] S202, based on the inherent frequency of the quartz crystal. Frequency drift and quality Determine the change in mass per unit area of ​​quartz wafers caused by dust deposition. .

[0102] Specifically, the total change in mass of the quartz wafer caused by dust deposition. At that time, frequency drift Total change in mass Satisfy the following formula (2):

[0103] (2).

[0104] Based on formulas (1) and (2) and the area to be monitored This allows us to further obtain the change in mass per unit area of ​​the quartz wafer caused by dust deposition. Change in mass per unit area It can be expressed by the following formula (3):

[0105] (3).

[0106] S203, based on the change in mass per unit area of ​​the quartz wafer caused by dust deposition. Dust deposition density and the area to be monitored Determine the thickness of dust deposition. Specifically, the thickness of dust deposition. It can be given by the following formula (4):

[0107] (4).

[0108] In some embodiments, before calculating the dust deposition thickness on the sensing module 3 based on the frequency signal, the cleaning control method of this application may further include: correcting the frequency signal based on environmental data within the housing 1.

[0109] Specifically, environmental data can include temperature, humidity, etc. At the same time, a temperature and humidity compensation algorithm can be configured in the system to correct the frequency signal based on the temperature and humidity compensation algorithm, so that the system itself has a self-healing function and is suitable for long-term online stable operation.

[0110] In some embodiments, before calculating the dust deposition thickness on the sensing module 3 based on the frequency signal, the cleaning control method of this application may further include: correcting the sensitivity of the sensor 31 based on the frequency drift. Specifically, a sensitivity parameter correction algorithm can be built into the system to ensure long-term measurement accuracy and stability.

[0111] In some embodiments, controlling the self-cleaning module 4 to clean the sensing module 3 may specifically include the following steps S301-S303.

[0112] S301 controls the vibration of the piezoelectric vibrator 41 of the cleaning module 4.

[0113] S302, after the piezoelectric vibrator 41 vibrates for a first time period (e.g., vibrates for 5 seconds), the control component 43 of the cleaning module 4 opens the pulse airflow nozzle 42.

[0114] S303, the control component 43 compresses the air inside the housing 1 (which can generate pulsed compressed air at 0.3-0.6 MPa) and sprays airflow toward the sensing module 3 through the pulse airflow nozzle 42 (e.g., blowing for 0.3 seconds at a pressure of 0.4 MPa) to clean the sensing module 3.

[0115] In this embodiment, by sequentially activating the piezoelectric vibrator 41 to vibrate and the control component 43 to open the pulse airflow nozzle 42, the dust on the surface of the sensing module 3 is thoroughly removed by utilizing the synergistic effect of vibration and airflow, thereby improving cleaning quality and efficiency.

[0116] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A dust monitoring and cleaning system, characterized in that, include: Shell (1); The sampling module (2) is disposed inside the housing (1) and is used to introduce the dust-laden airflow in the area to be monitored into the housing (1); The sensing module (3) is disposed inside the housing (1) and is used to generate a frequency signal based on the dust-laden airflow; The self-cleaning module (4) is disposed inside the housing (1) and is used to clean the sensing module (3); A regional cleaning module (5) is disposed outside the housing (1); as well as The control module (6) is connected to the sampling module (2), the sensing module (3), the self-cleaning module (4), and the area cleaning module (5). The control module (6) is configured to determine the dust deposition thickness based on the frequency signal sent by the sensing module (3), and control the self-cleaning module (4) to clean the sensing module (3) when the dust deposition thickness is not less than a first threshold, and control the area cleaning module (5) to clean the area to be monitored when the dust deposition thickness is not less than a second threshold, wherein the first threshold is less than the second threshold. The sampling module (2) includes a dustproof grille (21), an airflow guide ring (22), a settling component (23), and a centrifugal fan (24). The dustproof grille (21), the airflow guide ring (22), and the settling member (23) are arranged sequentially inside the housing (1), and the dustproof grille (21) is located at the end of the housing (1); The airflow guide ring (22) is spaced apart from the dustproof grille (21), and the airflow guide ring (22) is provided with a central through hole (222) and a plurality of guide holes (221) located outside the central through hole (222). One end of the settling member (23) abuts against the airflow guide ring (22) and the other end abuts against the sensing module (3), and the settling member (23) forms a settling chamber (231) that communicates with the central through hole (222) of the airflow guide ring (22). The centrifugal fan (24) is installed inside the housing (1) and communicates with the outside of the housing (1) through the plurality of guide holes (221) and the dustproof grid (21) to introduce the dust-laden airflow in the area to be monitored into the housing (1). The sensing module (3) can collect dust in the dust-laden airflow through the settling chamber (231) and the central through hole (222).

2. The dust monitoring and cleaning system according to claim 1, characterized in that, The sensing module (3) includes at least a sensor (31), which includes a quartz crystal, a metal electrode and an oscillation circuit; The metal electrode is used to apply an alternating electric field inside the housing (1), and the quartz crystal can generate resonant vibration under the alternating electric field. The oscillation circuit collects the frequency signal of the quartz crystal in real time and outputs it to the control module (6).

3. The dust monitoring and cleaning system according to claim 2, characterized in that, The sensing module (3) further includes a temperature and humidity sensor (32), which is disposed inside the housing (1) and is used to monitor environmental data inside the housing (1). The control module (6) is also connected to the temperature and humidity sensor (32) and uses the environmental data monitored by the temperature and humidity sensor (32) to correct the frequency signal output by the oscillation circuit.

4. The dust monitoring and cleaning system according to claim 2, characterized in that, The self-cleaning module (4) includes: a piezoelectric vibrator (41), multiple pulse airflow nozzles (42), and multiple control components (43). Among them, the piezoelectric vibrator (41) is disposed below the sensing module (3), and a plurality of pulse airflow nozzles (42) are spaced around the outside of the sensing module (3), and a plurality of control components (43) are disposed in a one-to-one correspondence with a plurality of pulse airflow nozzles (42); The control module (6) connects the piezoelectric vibrator (41) and the control component (43) to control the piezoelectric vibrator (41) to generate vibration and the control component (43) to control the corresponding pulse airflow nozzle (42) to spray airflow to clean the sensing module (3).

5. The dust monitoring and cleaning system according to any one of claims 2-4, characterized in that, The control module (6) includes a main control board (61), a power supply and communication board (62), and a rechargeable battery (63). The rechargeable battery (63) is used to power the main control board (61), the sampling module (2), the sensing module (3) and the self-cleaning module (4); The main control board (61) is connected to the power supply and communication board (62), the sampling module (2), the sensing module (3) and the self-cleaning module (4); The power supply and communication board (62) is communicatively connected to the area cleaning module (5) and is used to send an area cleaning trigger signal to the area cleaning module (5) when the deposition thickness is not less than the second threshold.

6. A cleaning control method, characterized in that, Configured in the dust monitoring and cleaning system according to any one of claims 2-5, and comprising: Control the operation of the sampling module (2) to introduce the dust-laden airflow in the area to be monitored into the housing (1); The sensor module (3) receives the frequency signal generated by the dust-laden airflow and calculates the dust deposition thickness on the sensor module (3) based on the frequency signal. When the dust deposition thickness is not less than the first threshold, the self-cleaning module (4) is controlled to clean the sensing module (3); When the dust deposition thickness is not less than the second threshold, the area cleaning module (5) is controlled to clean the area to be monitored.

7. The cleaning control method according to claim 6, characterized in that, The calculation of the dust deposition thickness on the sensing module (3) based on the frequency signal includes: The natural frequency of the quartz wafer is determined based on its thickness, elastic modulus, and crystal density. Based on the inherent frequency, frequency drift, and mass of the quartz wafer, determine the change in mass per unit area of ​​the quartz wafer caused by dust deposition; The thickness of the dust deposition is determined based on the change in mass per unit area of ​​the quartz wafer caused by the dust deposition, the dust deposition density, and the area of ​​the region to be monitored.

8. The cleaning control method according to claim 7, characterized in that, Before calculating the dust deposition thickness on the sensing module (3) based on the frequency signal, the cleaning control method further includes: correcting the frequency signal based on environmental data inside the housing (1); And / or, the cleaning control method further includes: correcting the sensitivity of the sensor (31) according to the frequency drift.

9. The cleaning control method according to claim 7, characterized in that... The self-cleaning module (4) includes a piezoelectric vibrator (41), multiple pulse airflow nozzles (42), and multiple control components (43). Controlling the self-cleaning module (4) to clean the sensing module (3) includes: Control the vibration of the piezoelectric vibrator (41); After the piezoelectric vibrator (41) vibrates for a first time period, the control component (43) is controlled to open the pulse airflow nozzle (42). The control component (43) is controlled to compress the air inside the housing (1) and spray airflow toward the sensing module (3) through the pulse airflow nozzle (42) to clean the sensing module (3).

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