Multi-mode dust particle detection system and method for coal preparation plant workshop

Abstract

The invention discloses a coal preparation plant workshop multi-mode dust particle detection system and method. According to the system, a dust monitoring unit comprises a dust monitoring chamber, a continuous collection mechanism, a continuous detection mechanism and a cleaning mechanism; the continuous collection mechanism comprises a turnover motion assembly, a collection plate, a micro oscillation motor, a drying pipeline, a mass flow controller and a flow pump; the two collecting plates are oppositely mounted at the upper end and the lower end of the supporting frame up and down, and micro oscillation motors are mounted on the opposite surfaces; the drying pipeline is connected in series with the middle section of the chamber air inlet pipeline; the mass flow controller and the flow pump are positioned in the dust monitoring chamber and are sequentially connected in series to the gas outlet pipeline of the chamber; the continuous detection mechanism comprises a CCD module, a Raman laser, an LIBS laser and a spectrometer; the cleaning mechanism comprises a particulate matter collecting device, a cleaning air hole, a flow pump and a mass flow controller; the method comprises the steps of preparation work; debugging the system; monitoring dust particles; and ending the monitoring operation. According to the system and the method, the dust particle detection operation can be continuously realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of dust particle monitoring, and in particular relates to a multi-modal dust particle detection system and method in a coal preparation plant workshop. Background Art

[0002] The detection of particle composition and particle dispersion in the workshop environment of a coal preparation plant is of great significance in production and environmental management. The particles in the workshop usually come from the crushing, screening and transportation of coal. Their composition is complex, including mineral particles, organic particles, and a variety of metal elements and impurity particles. Testing the composition of these particles can not only evaluate the material loss in the coal processing process, but also identify potential pollutant emission risks, and provide reliable data support for process improvement and pollution prevention. At the same time, particle dispersion detection helps to analyze the spatial distribution characteristics of particles in the environment, help optimize the design and operation of the dust removal system in the workshop, and reduce the impact of particles on equipment and personnel. Therefore, the detection of particle composition and dispersion evaluation are an indispensable and important part of the workshop of a coal preparation plant.

[0003] At present, the commonly used technologies for particle component detection include Raman spectroscopy, X-ray fluorescence spectroscopy (XRF), scanning electron microscopy (SEM), and laser induced breakdown spectroscopy (LIBS). Raman spectroscopy can provide molecular information of particles, but the detection effect of inorganic substances and trace components is poor; XRF and SEM technologies are more sensitive to the detection of inorganic substances and metal elements, but the equipment is large and the operation process is complicated, making it difficult to achieve real-time detection; although LIBS technology has the advantages of wide detection range and real-time detection, the signal is easily disturbed when the particle surface is unevenly distributed, resulting in unstable detection results. In addition, most technologies have high requirements for the dispersion state of particles, lack effective means of particle distribution control, and it is difficult to ensure the accuracy of component and element detection and the stability of dispersion test. Therefore, the existing technology has certain deficiencies in comprehensive performance and practicality. In order to effectively solve the limitations of the existing technology, it is urgent to provide a multimodal particle detection device to effectively solve the key technical problems in particle component and element detection and dispersion evaluation. Summary of the invention

[0004] In response to the above-mentioned problems of the prior art, the present invention provides a multimodal dust particle detection system and method for a coal preparation plant workshop. The system has a compact structure, high detection accuracy, and a convenient operation process, and can continuously realize the detection operation of dust particles; the method has a simple implementation process and a high degree of automation, and can accurately obtain the particle dispersion data, particle chemical composition data, and particle chemical element data of the dust particles.

[0005] In order to achieve the above-mentioned object, the present invention provides a multi-modal dust particle detection system for a coal preparation plant workshop, comprising a housing, a dust monitoring unit and a control unit;

[0006] The housing has an installation cavity formed inside, an air inlet connected to the installation cavity is provided on the left side plate, an air outlet connected to the installation cavity is provided on the right side plate, and an air supply port is provided on the front side plate or the rear side plate;

[0007] The dust monitoring unit is installed in the installation cavity, and the dust monitoring unit includes a dust monitoring chamber, a continuous collection mechanism, a continuous detection mechanism and a cleaning mechanism;

[0008] The upper left side of the dust monitoring chamber is connected to a chamber air inlet pipeline communicating with its inner cavity, and the lower right side is connected to a chamber air outlet pipeline communicating with its inner cavity; the air inlet end of the chamber air inlet pipeline is connected to the air inlet on the shell, and at the same time, the air inlet end of the chamber air inlet pipeline is connected in series with an electric valve; the air outlet end of the chamber air outlet pipeline is connected to the air outlet on the shell;

[0009] The continuous collection mechanism includes a flip motion component, a collection plate, a micro-oscillation motor, a drying pipeline, a first mass flow controller and a first flow pump; the flip motion component is installed inside the dust monitoring chamber, and includes a support frame and a rotation drive mechanism, the support frame is horizontally arranged at the lower side of the interior of the dust monitoring chamber, and the rotation drive mechanism is installed on one side of the side wall of the dust monitoring chamber, and its output shaft is connected to one end of the support frame, which is used to drive the support frame to rotate around the transverse axis; two collection plates are installed at the upper and lower ends of the support frame relative to each other, and the two plate surfaces on the opposite sides of the two collection plates are used as two dust collection plate surfaces, and the two plate surfaces on the adjacent sides are used as two mounting plate surfaces; micron-level grid lines are engraved on the dust collection plate surface; two pairs of micro-oscillation motors are respectively installed on the two mounting plate surfaces of the two collection plates; the drying pipeline is located outside the dust monitoring chamber and is serially connected to the middle section of the chamber air inlet pipeline; the first mass flow controller and the first flow pump are located outside the dust monitoring chamber, and are serially connected to the chamber air outlet pipeline in sequence from the air inlet side to the air outlet side;

[0010] The continuous detection mechanism includes a CCD module, a Raman laser, a LIBS laser and a spectrometer; the CCD module is installed on the top of the dust monitoring chamber, and its collection window is located inside the dust monitoring chamber and faces the dust collection plate surface of the upper collection plate; the Raman laser, the LIBS laser and the spectrometer are located outside the dust monitoring chamber, the Raman transmission optical fiber connected to the Raman laser penetrates into the interior of the dust monitoring chamber, and the output end of the Raman transmission optical fiber faces the dust collection plate surface of the upper collection plate; the LIBS transmission optical fiber connected to the LIBS laser penetrates into the interior of the dust monitoring chamber, and the output end of the LIBS transmission optical fiber faces the dust collection plate surface of the upper collection plate; the receiving optical fiber connected to the spectrometer penetrates into the interior of the dust monitoring chamber, and the input end of the receiving optical fiber faces the dust collection plate surface of the upper collection plate;

[0011] The cleaning mechanism includes a particle collecting device, a cleaning air hole, a second flow pump and a second mass flow controller; the upper end of the particle collecting device is an open structure, which is installed on the bottom side of the dust monitoring chamber and is located below the support frame; the cleaning air hole is opened on the side wall on the left side of the lower part of the dust monitoring chamber, and is located below the dust collecting plate surface on the lower collecting plate; the second flow pump and the second mass flow controller are both located outside the dust monitoring chamber, and the air inlet end of the second flow pump is connected to the air supply port on the shell through a cleaning air inlet pipeline, and the air outlet end is connected to the cleaning air hole through a chamber cleaning pipeline, wherein the air inlet end of the cleaning air inlet pipeline is provided with a filtering device; the second mass flow controller is serially connected to the middle section of the chamber cleaning pipeline;

[0012] The control unit includes a power module, a drive control module, a data acquisition module and a data processing module; the power module is connected to each electrical component for power supply; the data acquisition module is respectively connected to the first mass flow controller, the CCD module, the spectrometer, and the second mass flow controller; the drive control module is respectively connected to the electric valve, the first flow pump, the rotary drive mechanism, the micro-oscillation motor, the second flow pump, the first mass flow controller, the second mass flow controller, the Raman laser, the LIBS laser, and the spectrometer; the data processing module is respectively connected to the data acquisition module and the drive control module.

[0013] Furthermore, the air outlet section of the chamber air inlet pipeline is a straight pipe section 1, and the straight pipe section 1 is tilted so that it is higher on the left and lower on the right, and at the same time, the air outlet end of the straight pipe section 1 is located above the upper collecting plate; the air inlet section of the chamber air outlet pipeline is a straight pipe section 2, and the straight pipe section 2 is tilted so that it is higher on the left and lower on the right, and at the same time, the air inlet end of the straight pipe section 2 is located below the lower collecting plate; the air outlet section of the chamber cleaning pipeline is a straight pipe section 3, and the straight pipe section 3 is tilted so that it is lower on the left and higher on the right, and at the same time, the air outlet end of the straight pipe section 3 is located below the lower collecting plate. The arrangement of the straight pipe section 1 and the straight pipe section 2 is conducive to ensuring that the airflow path flowing through the dust monitoring chamber passes through the upper area of ​​the upper collecting plate, thereby being conducive to improving the effect of the upper collecting plate in collecting dust particles. The arrangement of the direct pipe 3 is conducive to making the clean airflow blow obliquely to the lower collecting plate, thereby being able to achieve efficient purging of residual dust on the lower collecting plate.

[0014] Furthermore, in order to facilitate replenishing the power of the power module, the control unit also includes a charging plug, in which a charging circuit is built-in and connected to the power module through the charging circuit.

[0015] Furthermore, the continuous collection mechanism also includes a cyclone separator, which is installed on the outer wall of the shell and connected in series to the air inlet end of the chamber air inlet pipeline. Through the setting of the cyclone separator, large particles in the air flow can be separated from the air flow by the centrifugal principle, so that these large-size particles will not enter the dust monitoring room, ensuring the accuracy of subsequent detection.

[0016] As a preference, the data processing module is a PLC controller.

[0017] As a preference, the output ends of the Raman transmission optical fiber and the LIBS transmission optical fiber are distributed in an inverted eight shape on both sides of the upper collecting plate.

[0018] Furthermore, in order to improve control accuracy, the rotation drive mechanism is a stepping motor.

[0019] Furthermore, in order to effectively reduce the adsorption force of the dust collecting plate on the dust so as to efficiently remove the dust during the cleaning process, a dust tetrafluoroethylene coating is coated on the dust collecting plate surface of the collecting plate.

[0020] Furthermore, in order to facilitate real-time display of monitoring data, the control unit also includes a display screen connected to the data processing module, and the display screen is installed on the outer side wall of the shell.

[0021] In the present invention, an electric valve is connected in series at the air inlet end of the chamber air inlet pipeline, so that the opening and closing of the air inlet path can be automatically controlled. Two collecting plates are installed on the upper and lower ends of the support frame relatively up and down, and the support frame is driven by a rotating drive mechanism to rotate, so that the two collecting plates can be automatically controlled to monitor the positions alternately. In combination with the setting of the cleaning mechanism, the upper collecting plate can be used to collect dust, and at the same time, the lower collecting plate can be cleaned by the cleaning mechanism. Thus, the two collecting plates can be used to collect dust alternately, ensuring continuous dust particle monitoring. The second flow pump is connected to the cleaning air hole through the chamber cleaning pipeline, so that during the cleaning operation, the high-speed airflow provided by the second flow pump can be used to efficiently blow off the dust on the dust collection plate surface, so that the collection plate can be reused, thereby ensuring the continuous detection operation. At the same time, timely cleaning operations are beneficial to extending the service life of the collection plate. The setting of the second mass flow controller can play a role in flow regulation and flow stabilization, further ensuring the efficiency and effect of the cleaning operation. The first flow pump is connected to the inner cavity of the dust monitoring chamber through the chamber outlet pipe, which can provide negative pressure for the dust monitoring chamber, so that the external airflow can be introduced into the dust monitoring chamber for detection operation, and can be discharged through the chamber outlet pipe. Micrometer-level grid lines are engraved on the dust collection plate surface, and dust particles and micrometer-level grid lines can be formed together in the high-resolution image during the image acquisition process of the CCD module. Then, in the process of high-resolution image processing by the data processing module, the micrometer-level grid lines can be used as a reference benchmark, which can play a role in auxiliary analysis and is conducive to obtaining more accurate particle dispersion data. Through the setting of the first mass flow controller, it can play a role in flow regulation and flow stabilization, so that the airflow can flow smoothly through the dust monitoring chamber, which is conducive to obtaining more accurate dust particle monitoring results. By installing two pairs of micro-oscillation motors on the opposite sides of the two collecting plates, on the one hand, when the upper collecting plate collects the deposited dust, the pair of micro-oscillation motors on the upper side can make a slight vibration to cause the dust particles on the upper collecting plate to be more evenly dispersed to different parts of the micron-scale grid line, and can form a thin layer with uniform distribution. The uniform distribution of particles is conducive to obtaining a better excitation effect when the Raman laser and LIBS laser are used in the subsequent operation, and can effectively reduce the signal interference caused by particle focusing, ensuring the accuracy of spectral signal acquisition. As a result, the micro-oscillation motor significantly improves the accuracy and detection efficiency of the dispersion test, and effectively improves the accuracy of component and element detection. At the same time, it is conducive to obtaining higher quality images in the subsequent image acquisition, ensuring that the distribution characteristics between particles are clearer, and facilitating more accurate calculation results in the subsequent image processing process. On the other hand, in the process of cleaning the lower collecting plate, the pair of micro-oscillation motors on the lower side can be used to make a slight vibration to cause the dust on the lower collecting plate to fall off quickly.A Raman laser is set, and the Raman transmission optical fiber connected to it is inserted into the dust monitoring room, so that the Raman laser can be used to generate laser light and output it to the dust particles on the collection plate through the Raman transmission optical fiber, thereby stimulating the molecules of the dust particles to vibrate and generate Raman scattered light; a LIBS laser is set, and the LIBS transmission optical fiber connected to it is inserted into the dust monitoring room, so that the LIBS laser can be used to generate pulsed laser light and output it to the dust particles on the collection plate through the LIBS transmission optical fiber, thereby stimulating the dust particles to form plasma; a spectrometer is set, and the receiving optical fiber connected to it is inserted into the dust monitoring room, so that the scattered light signal and the plasma light signal can be received, so that the data processing module can obtain the chemical composition data of the particles based on the scattered light signal, and obtain the chemical element data of the particles based on the plasma light signal. Since the particle dispersion data will affect the selectivity of coal quality, obtaining the particle dispersion data is helpful to adjust the sorting efficiency and particle size distribution in the coal preparation process, thereby effectively optimizing the sorting process and significantly improving the recovery rate and quality of coal. Since the chemical composition data and chemical element data of particulate matter can accurately analyze and judge the toxicity of particulate matter in the environment, and thus obtain the types and concentrations of harmful chemicals in the environment, as well as information on dangerous elements such as heavy metals and nitrides, it is beneficial to ensure the safety factor in the coal preparation process.

[0022] The system has the characteristics of compact structure, high detection accuracy and easy operation. It integrates Raman spectroscopy and LIBS spectroscopy detection technology, can continuously realize the detection of dust particles, and at the same time, can accurately obtain the particle dispersion data, particle chemical composition data and particle chemical element data of dust particles, which is conducive to ensuring the efficient and safe coal preparation operations. It is suitable for the rapid and efficient detection of particles in the workshop environment of coal preparation plants, and provides a new solution for the composition analysis and dispersion testing of particles.

[0023] The present invention also provides a multi-modal dust particle detection method in a coal preparation plant workshop, using a multi-modal dust particle detection system in a coal preparation plant workshop, comprising the following steps:

[0024] Step 1: Preparation;

[0025] First, the multimodal dust particle detection system of the coal preparation plant workshop is placed horizontally in the coal preparation plant workshop;

[0026] Step 2: System debugging;

[0027] The power module is used to supply power to start the multimodal dust particle detection system in the coal preparation plant workshop; the Raman laser, LIBS laser, spectrometer and CCD module are controlled to start working, and the Raman laser, LIBS laser and spectrometer are debugged respectively, so that the focus of the output light beam of the Raman transmission optical fiber is located on the dust collection board surface of the upper collection board, the focus of the output light beam of the LIBS transmission optical fiber is located on the dust collection board surface of the upper collection board, the input end of the receiving optical fiber is aligned with the dust collection board surface of the upper collection board, and the collection window of the CCD module is focused on the dust collection board surface of the upper collection board; after the debugging is completed, the Raman laser and LIBS laser are turned off;

[0028] Step 3: Dust particle monitoring;

[0029] S31: Control the electric control valve to open, control the first flow pump to start working, control the first mass flow controller to start working, use the first flow pump to provide drainage negative pressure, so that the external air flow to be detected is dried by the drying pipeline and then enters the dust monitoring room through the chamber air inlet path. In the process of flowing through the dust monitoring room, the dust collecting plate on the upper collecting plate is used to collect the dust, and the air flow discharged from the dust monitoring room is drained to the outside through the chamber air outlet path. In the process of air flow discharge, the first mass flow controller is used to regulate the gas flow through the chamber air outlet path and stabilize the air flow;

[0030] S32: After S31 continues for a set time, the electronically controlled valve is controlled to close and the first flow pump is controlled to stop working, and a stage detection operation of dust particles is performed. During the stage detection operation, four sub-stages with set time are sequentially passed to perform real-time detection operations. The specific process is as follows:

[0031] S32-1: In the first sub-stage, a pair of micro-oscillation motors on the upper collecting plate are controlled to vibrate slightly at a set frequency and amplitude, so that the dust deposited on the dust collecting plate surface forms a more evenly distributed thin layer through the slight vibration. After reaching the first set time period, the pair of micro-oscillation motors on the upper collecting plate are controlled to stop working;

[0032] S32-2: In the second sub-stage, the LIBS laser is first controlled to start emitting a pulsed laser, and the pulsed laser is output to the dust collection plate through the LIBS transmission optical fiber, and the dust is excited by the pulsed laser to form a plasma. At the same time, the plasma optical signal is received by the receiving optical fiber and transmitted to the spectrometer, and the plasma optical signal is analyzed and processed by the spectrometer to obtain the LIBS spectrum signal, and then the LIBS spectrum signal is sent to the data acquisition module. The data acquisition module processes the received LIBS spectrum signal and sends it to the data processing module. The data processing module obtains the chemical element data of the particulate matter according to the LIBS spectrum signal, and sends the chemical element data of the particulate matter to the display screen for real-time display. After reaching the second set time period, the LIBS laser is controlled to be turned off;

[0033] S32-3: In the third sub-stage, the Raman laser is first controlled to start emitting laser light, and the laser is output to the dust collection plate through the Raman transmission optical fiber, and the laser is used to excite the dust molecules to vibrate and generate Raman scattered light. At the same time, the Raman scattered light is received by the receiving optical fiber and transmitted to the spectrometer, and the spectrometer is used to analyze and process the Raman scattered light and obtain the Raman spectrum signal, and then the Raman spectrum signal is sent to the data acquisition module, and the data acquisition module processes the received Raman spectrum signal and sends it to the data processing module, and the data processing module obtains the chemical composition data of the particulate matter according to the Raman spectrum signal, and sends the chemical composition data of the particulate matter to the display screen for real-time display, and controls the LIBS laser to be turned off after the third set time period is reached;

[0034] S32-3: In the fourth sub-stage, the CCD module is first controlled to start and obtain a high-resolution image of the dust falling on the dust collection plate, and then the high-resolution image is sent to the data acquisition module. The data acquisition module processes the received high-resolution image and sends it to the data processing module. The data processing module obtains the particle dispersion data according to the high-resolution image, and sends the particle dispersion data to the display screen for real-time display. After the fourth set time is reached, the CCD module is controlled to shut down;

[0035] S33: Control the rotary drive mechanism to drive the support frame to rotate 180 degrees, so that the collecting plate originally located on the upper side and the collecting plate originally located on the lower side are exchanged, and then control the rotary drive mechanism to stop the action;

[0036] S34: Control the second flow pump to start working, control the second mass flow controller to start working, and at the same time, control a pair of micro-oscillation motors on the lower collecting plate to vibrate slightly at a set frequency and amplitude; use the second flow pump to extract the external airflow filtered by the filter device as the clean airflow, and pressurize the clean airflow. At the same time, use the second mass flow controller to regulate the flow of the clean airflow, and stabilize the clean airflow, so that the clean airflow enters the dust monitoring room at a stable speed and performs a directionally blow on the dust collection plate surface of the lower collecting plate to blow off the dust remaining on the dust collection plate surface. At the same time, use small vibrations to further loosen the residual dust deposited on the dust collection plate surface and quickly fall off, and use the particle collection device to collect the fallen dust; after the set time, control the second flow pump to stop working, control the second mass flow controller to stop working, and control the pair of micro-oscillation motors on the lower collecting plate to stop working;

[0037] S35: Repeat S31 to S34 multiple times to perform intermittent detection of dust particles in the coal preparation plant workshop, and simultaneously output particle chemical element data, particle chemical composition data, and particle dispersion data;

[0038] Step 4: End the monitoring operation;

[0039] The data processing module controls the electric valve to close through the drive control module, controls the first flow pump and the micro-oscillation motor to stop, controls the second flow pump to stop, controls the first mass flow controller to stop, controls the second mass flow controller to stop, controls the Raman laser to stop, controls the LIBS laser to stop, and controls the spectrometer to stop; controls the power supply module to stop supplying power, and ends the dust particle monitoring operation.

[0040] The present invention provides a multimodal particle detection method for a coal preparation plant workshop, which fully combines Raman spectroscopy and LIBS spectroscopy detection technology to form a multimodal detection technology, and can simultaneously obtain the molecular information and elemental composition of the particles by optimizing the optical path design and the detection process. This multimodal detection method significantly improves the comprehensiveness of particle analysis, and can complete the collection of multi-dimensional information through one detection, avoiding the cumbersome process of multiple detections in the traditional method. Secondly, during the detection process, a micro-oscillation motor is used to achieve uniform distribution of particles on the surface of the collection plate, which effectively solves the problem of signal deviation caused by particle aggregation in the traditional detection process, and significantly improves the accuracy of CCD dispersion test and spectral signal acquisition. In addition, during the detection process, the upper collection plate is used to collect dust, and at the same time, the cleaning mechanism is used to clean the lower collection plate. The continuous detection process is ensured by the mechanism of synchronous combination of collection and cleaning. Through the joint action of the second airflow pump, the second mass flow controller and the oscillation motor, efficient blowing and vibration cleaning of the lower collection plate are achieved. This design not only improves the automation level of the detection process and reduces manual intervention, but also provides a clean collection plate surface for the next round of detection, ensuring the stability of the detection and long-term operation of the equipment.

[0041] The implementation process of this method is simple and the degree of automation is high. It can efficiently and accurately detect dust particles in the environment. At the same time, it can accurately obtain the particle dispersion data, particle chemical composition data and particle chemical element data of the dust particles, which is conducive to ensuring the efficient and safe coal preparation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the structure of the present invention;

[0043] Figure 2 This is a schematic diagram of the structure of the dust monitoring unit in the present invention. Figure 1 ;

[0044] Figure 3 This is a schematic diagram of the structure of the dust monitoring unit in the present invention. Figure 2 .

[0045] In the figure: 1. Shell; 2. Cyclone separator; 3. Drying pipeline; 4. Charging plug; 5. Dust detection unit; 6. Spectrometer; 7. LIBS laser; 8. Raman laser; 9. First mass flow controller; 10. First flow pump; 11. Second mass flow controller; 12. Second flow pump; 13. Drive control module; 14. Data acquisition module; 15. Data processing module; 16. Power module; 17. CCD module; 18. Raman transmission fiber; 19. LIBS transmission optical fiber; 20. Receiving optical fiber; 21. Collection plate; 22. Flip motion assembly; 23. Particle collection device; 24. Micro oscillation motor; 25. Chamber cleaning pipeline; 26. Chamber air inlet air path; 27. Chamber air outlet air path; 28. Cleaning air holes; 29. ​​Dust monitoring chamber; 30. Support frame; 31. Rotation drive mechanism; 32. Control unit; 33. Straight pipe section one; 34. Straight pipe section two; 35. Straight pipe section three; 36. Clean the air inlet pipeline. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] like Figures 1 to 3 As shown, the present invention provides a multi-modal dust particle detection system for a coal preparation plant workshop, comprising a housing 1, a dust monitoring unit 5 and a control unit 32;

[0048] The housing 1 has an installation cavity formed inside, an air inlet connected to the installation cavity is provided on the left side plate, an air outlet connected to the installation cavity is provided on the right side plate, and an air supply port is provided on the front side plate or the rear side plate;

[0049] The dust monitoring unit 5 is installed in the installation cavity, and the dust monitoring unit 5 includes a dust monitoring chamber 29, a continuous collection mechanism, a continuous detection mechanism and a cleaning mechanism;

[0050] The upper left side of the dust monitoring chamber 29 is connected to a chamber air inlet pipeline 26 communicating with its inner cavity, and the lower right side is connected to a chamber air outlet pipeline 27 communicating with its inner cavity; the air inlet end of the chamber air inlet pipeline 26 is connected to the air inlet on the shell 1, and at the same time, the air inlet end of the chamber air inlet pipeline 26 is connected in series with an electric valve; the air outlet end of the chamber air outlet pipeline 27 is connected to the air outlet on the shell 1;

[0051] The continuous collection mechanism includes a flip motion component 22, a collection plate 21, a micro-oscillation motor 24, a drying pipeline 3, a first mass flow controller 9 and a first flow pump 10; the flip motion component 22 is installed inside the dust monitoring chamber 29, and includes a support frame 30 and a rotation drive mechanism 31, the support frame 30 is horizontally arranged at the lower side of the dust monitoring chamber 29, and the rotation drive mechanism 31 is installed on one side wall of the dust monitoring chamber 29, and its output shaft is connected to one end of the support frame 30, and is used to drive the support frame 30 to rotate around the transverse axis; the two collection plates 21 are arranged relatively up and down. Installed at the upper and lower ends of the support frame 30, the two plate surfaces on the opposite sides of the two collecting plates 21 are used as two dust collecting plate surfaces, and the two plate surfaces on the adjacent sides are used as two mounting plate surfaces; the dust collecting plate surfaces are engraved with micron-level grid lines; two pairs of micro-oscillation motors 24 are respectively installed on the two mounting plate surfaces of the two collecting plates 21; the drying pipeline 3 is located outside the dust monitoring chamber 29 and is serially connected to the middle section of the chamber air inlet pipeline 26; the first mass flow controller 9 and the first flow pump 10 are located outside the dust monitoring chamber 29, and are serially connected to the chamber air outlet pipeline 27 in sequence from the air inlet side to the air outlet side;

[0052] As a preferred embodiment, the frequency and amplitude of the micro-oscillation motor 24 are adjustable, so that it can adapt to the physical properties of different particles and achieve the best particle distribution effect, thereby further improving the detection sensitivity and accuracy.

[0053] The continuous detection mechanism includes a CCD module 17, a Raman laser 8, a LIBS laser 7 and a spectrometer 6; the CCD module 17 is installed on the top of the dust monitoring chamber 29, and its collection window is located inside the dust monitoring chamber 29 and faces the dust collection plate surface of the upper collecting plate 21; the Raman laser 8, the LIBS laser 7 and the spectrometer 6 are located outside the dust monitoring chamber 29, the Raman transmission optical fiber 18 connected to the Raman laser 8 penetrates into the interior of the dust monitoring chamber 29, and the output end of the Raman transmission optical fiber 18 faces the dust collection plate surface of the upper collecting plate 18; the LIBS transmission optical fiber 19 connected to the LIBS laser 7 penetrates into the interior of the dust monitoring chamber 29, and the output end of the LIBS transmission optical fiber 19 faces the dust collection plate surface of the upper collecting plate 18; the receiving optical fiber 20 connected to the spectrometer 6 penetrates into the interior of the dust monitoring chamber 29, and the input end of the receiving optical fiber 20 faces the dust collection plate surface of the upper collecting plate 18;

[0054] The cleaning mechanism includes a particle collecting device 23, a cleaning air hole 28, a second flow pump 12 and a second mass flow controller 11; the upper end of the particle collecting device 23 is an open structure, which is installed on the bottom side of the dust monitoring chamber 29 and is located below the support frame 30; the cleaning air hole 28 is opened on the side wall of the lower left side of the dust monitoring chamber 29, and is located below the dust collecting plate surface on the lower collecting plate 21; the second flow pump 12 and the second mass flow controller 11 are both located outside the dust monitoring chamber 29, and the air inlet end of the second flow pump 12 is connected to the air supply port on the shell 1 through the cleaning air inlet pipeline 36, and the air outlet end is connected to the cleaning air hole 28 through the chamber cleaning pipeline 25, wherein the air inlet end of the cleaning air inlet pipeline 36 is provided with a filtering device; the second mass flow controller 11 is connected in series to the middle section of the chamber cleaning pipeline 25;

[0055] The control unit includes a power module 16, a drive control module 13, a data acquisition module 14 and a data processing module 15; the power module 16 is connected to each electrical component for power supply; the data acquisition module 14 is respectively connected to the first mass flow controller 9, the CCD module 17, the spectrometer 6, and the second mass flow controller 11; the drive control module 13 is respectively connected to the electric valve, the first flow pump 10, the rotation drive mechanism 31, the micro oscillation motor 24, the second flow pump 12, the first mass flow controller 9, the second mass flow controller 11, the Raman laser 8, the LIBS laser 7, and the spectrometer 6; the data processing module 15 is respectively connected to the data acquisition module 14 and the drive control module 13.

[0056] The air outlet section of the chamber air inlet pipeline 26 is a straight pipe section 1 33, and the straight pipe section 1 33 is tilted so as to be higher on the left and lower on the right, and the air outlet end of the straight pipe section 1 33 is located above the upper collecting plate 21; the air inlet section of the chamber air outlet pipeline 27 is a straight pipe section 2 34, and the straight pipe section 2 34 is tilted so as to be higher on the left and lower on the right, and the air inlet end of the straight pipe section 2 34 is located below the lower collecting plate 21; the air outlet section of the chamber cleaning pipeline 25 is a straight pipe section 35, and the straight pipe section 35 is tilted so as to be lower on the left and higher on the right, and the air outlet end of the straight pipe section 3 35 is located below the lower collecting plate 21.

[0057] In order to supplement the power of the power module, the control unit further includes a charging plug 4 , in which a charging circuit is built-in and connected to the power module 16 via the charging circuit.

[0058] The continuous collection mechanism also includes a cyclone separator 2, which is mounted on the outer wall of the housing 1 and is serially connected to the air inlet end of the chamber air inlet pipeline 26. Through the setting of the cyclone separator, large particles in the air flow can be separated from the air flow by the centrifugal principle, so that these large-size particles will not enter the dust monitoring room, ensuring the accuracy of subsequent detection.

[0059] As a preference, the data processing module 15 is a PLC controller.

[0060] As a preference, the output ends of the Raman transmission optical fiber 18 and the LIBS transmission optical fiber 19 are distributed on both sides of the upper collecting plate 21 in an inverted eight shape.

[0061] In order to improve control accuracy, the rotation drive mechanism 31 is a stepping motor.

[0062] In order to effectively reduce the adsorption force of the dust collecting plate on the dust so as to efficiently remove the dust during the cleaning process, the dust collecting plate surface of the collecting plate 21 is coated with a dust tetrafluoroethylene coating.

[0063] In order to facilitate real-time display of monitoring data, the control unit also includes a display screen connected to the data processing module 15 , and the display screen is installed on the outer side wall of the housing 1 .

[0064] In the present invention, an electric valve is connected in series at the air inlet end of the chamber air inlet pipeline, so that the opening and closing of the air inlet path can be automatically controlled. Two collecting plates are installed on the upper and lower ends of the support frame relatively up and down, and the support frame is driven by a rotating drive mechanism to rotate, so that the two collecting plates can be automatically controlled to monitor the positions alternately. In combination with the setting of the cleaning mechanism, the upper collecting plate can be used to collect dust, and at the same time, the lower collecting plate can be cleaned by the cleaning mechanism. Thus, the two collecting plates can be used to collect dust alternately, ensuring continuous dust particle monitoring. The second flow pump is connected to the cleaning air hole through the chamber cleaning pipeline, so that during the cleaning operation, the high-speed airflow provided by the second flow pump can be used to efficiently blow off the dust on the dust collection plate surface, so that the collection plate can be reused, thereby ensuring the continuous detection operation. At the same time, timely cleaning operations are beneficial to extending the service life of the collection plate. The setting of the second mass flow controller can play a role in flow regulation and flow stabilization, further ensuring the efficiency and effect of the cleaning operation. The first flow pump is connected to the inner cavity of the dust monitoring chamber through the chamber outlet pipe, which can provide negative pressure for the dust monitoring chamber, so that the external airflow can be introduced into the dust monitoring chamber for detection operation, and can be discharged through the chamber outlet pipe. Micrometer-level grid lines are engraved on the dust collection plate surface, and dust particles and micrometer-level grid lines can be formed together in the high-resolution image during the image acquisition process of the CCD module. Then, in the process of high-resolution image processing by the data processing module, the micrometer-level grid lines can be used as a reference benchmark, which can play a role in auxiliary analysis and is conducive to obtaining more accurate particle dispersion data. Through the setting of the first mass flow controller, it can play a role in flow regulation and flow stabilization, so that the airflow can flow smoothly through the dust monitoring chamber, which is conducive to obtaining more accurate dust particle monitoring results. By installing two pairs of micro-oscillation motors on the opposite sides of the two collecting plates, on the one hand, when the upper collecting plate collects the deposited dust, the pair of micro-oscillation motors on the upper side can make a slight vibration to cause the dust particles on the upper collecting plate to be more evenly dispersed to different parts of the micron-scale grid line, and can form a thin layer with uniform distribution. The uniform distribution of particles is conducive to obtaining a better excitation effect when the Raman laser and LIBS laser are used in the subsequent operation, and can effectively reduce the signal interference caused by particle focusing, ensuring the accuracy of spectral signal acquisition. As a result, the micro-oscillation motor significantly improves the accuracy and detection efficiency of the dispersion test, and effectively improves the accuracy of component and element detection. At the same time, it is conducive to obtaining higher quality images in the subsequent image acquisition, ensuring that the distribution characteristics between particles are clearer, and facilitating more accurate calculation results in the subsequent image processing process. On the other hand, in the process of cleaning the lower collecting plate, the pair of micro-oscillation motors on the lower side can be used to make a slight vibration to cause the dust on the lower collecting plate to fall off quickly.A Raman laser is set, and the Raman transmission optical fiber connected to it is inserted into the dust monitoring room, so that the Raman laser can be used to generate laser light and output it to the dust particles on the collection plate through the Raman transmission optical fiber, thereby stimulating the molecules of the dust particles to vibrate and generate Raman scattered light; a LIBS laser is set, and the LIBS transmission optical fiber connected to it is inserted into the dust monitoring room, so that the LIBS laser can be used to generate pulsed laser light and output it to the dust particles on the collection plate through the LIBS transmission optical fiber, thereby stimulating the dust particles to form plasma; a spectrometer is set, and the receiving optical fiber connected to it is inserted into the dust monitoring room, so that the scattered light signal and the plasma light signal can be received, so that the data processing module can obtain the chemical composition data of the particles based on the scattered light signal, and obtain the chemical element data of the particles based on the plasma light signal. Since the particle dispersion data will affect the selectivity of coal quality, obtaining the particle dispersion data is helpful to adjust the sorting efficiency and particle size distribution in the coal preparation process, thereby effectively optimizing the sorting process and significantly improving the recovery rate and quality of coal. Since the chemical composition data and chemical element data of particulate matter can accurately analyze and judge the toxicity of particulate matter in the environment, and thus obtain the types and concentrations of harmful chemicals in the environment, as well as information on dangerous elements such as heavy metals and nitrides, it is beneficial to ensure the safety factor in the coal preparation process.

[0065] The system has the characteristics of compact structure, high detection accuracy and easy operation. It integrates Raman spectroscopy and LIBS spectroscopy detection technology, can continuously realize the detection of dust particles, and at the same time, can accurately obtain the particle dispersion data, particle chemical composition data and particle chemical element data of dust particles, which is conducive to ensuring the efficient and safe coal preparation operations. It is suitable for the rapid and efficient detection of particles in the workshop environment of coal preparation plants, and provides a new solution for the composition analysis and dispersion testing of particles.

[0066] The present invention also provides a multi-modal dust particle detection method in a coal preparation plant workshop, using a multi-modal dust particle detection system in a coal preparation plant workshop, comprising the following steps:

[0067] Step 1: Preparation;

[0068] First, the multimodal dust particle detection system of the coal preparation plant workshop is placed horizontally in the coal preparation plant workshop;

[0069] Step 2: System debugging;

[0070] The power module 16 is used to supply power to start the multimodal dust particle detection system in the coal preparation plant workshop; the Raman laser 8, the LIBS laser 7, the spectrometer 6 and the CCD module 17 are controlled to start working, and the Raman laser 8, the LIBS laser 7 and the spectrometer 6 are debugged respectively, so that the focus of the output light beam of the Raman transmission optical fiber 18 is located on the dust collection board surface of the upper collection board 18, the focus of the output light beam of the LIBS transmission optical fiber 19 is located on the dust collection board surface of the upper collection board 18, the input end of the receiving optical fiber 20 is aligned with the dust collection board surface of the upper collection board 18, and the collection window of the CCD module 17 is focused on the dust collection board surface of the upper collection board 18; after the debugging is completed, the Raman laser 8 and the LIBS laser 7 are turned off;

[0071] Step 3: Dust particle monitoring;

[0072] S31: Control the electric control valve to open, control the first flow pump 10 to start working, control the first mass flow controller 9 to start working, use the first flow pump 10 to provide drainage negative pressure, so that the external air flow to be detected is dried by the drying pipeline 3 and then enters the dust monitoring chamber 29 through the chamber air inlet air path 26. In the process of flowing through the dust monitoring chamber 29, the dust collecting plate surface on the upper collecting plate 21 is used to collect the fallen dust, and the air flow discharged from the dust monitoring chamber 29 is drained to the outside through the chamber outlet air path 27. In the process of air flow discharge, the first mass flow controller 9 is used to regulate the gas flow through the chamber outlet air path 27 and stabilize the outlet air flow;

[0073] S32: After S31 continues for a set time, the electronically controlled valve is controlled to close, and the first flow pump 10 is controlled to stop working, and a stage detection operation of dust particles is performed. During the stage detection operation, four sub-stages of set time are sequentially passed to perform real-time detection operations. The specific process is as follows:

[0074] S32-1: In the first sub-stage, a pair of micro-oscillation motors 24 on the upper collecting plate 21 are controlled to vibrate slightly at a set frequency and amplitude, so that the dust deposited on the dust collecting plate surface forms a more evenly distributed thin layer through the slight vibration. After reaching the first set time period, the pair of micro-oscillation motors 24 on the upper collecting plate 21 are controlled to stop working;

[0075] S32-2: In the second sub-stage, the LIBS laser 7 is first controlled to start emitting a pulsed laser, and outputted to the dust collection plate through the LIBS transmission optical fiber 19, and the pulsed laser is synchronously used to excite the dust and form a plasma. At the same time, the plasma optical signal is received by the receiving optical fiber 20 and transmitted to the spectrometer 6, and the spectrometer 6 is used to analyze and process the plasma optical signal and obtain a LIBS spectrum signal, and then the LIBS spectrum signal is sent to the data acquisition module 14. The data acquisition module 14 processes the received LIBS spectrum signal and sends it to the data processing module 15. The data processing module 15 obtains the chemical element data of the particulate matter according to the LIBS spectrum signal, and sends the chemical element data of the particulate matter to the display screen for real-time display. After reaching the second set time period, the LIBS laser 7 is controlled to be turned off;

[0076] S32-3: In the third sub-stage, the Raman laser 8 is first controlled to start emitting laser light, and the laser light is output to the dust collection plate through the Raman transmission optical fiber 18, and the dust molecules are simultaneously stimulated to vibrate by the laser light and generate Raman scattered light. At the same time, the Raman scattered light is received by the receiving optical fiber 20 and transmitted to the spectrometer 6, and the spectrometer 6 is used to analyze and process the Raman scattered light and obtain the Raman spectrum signal, and then the Raman spectrum signal is sent to the data acquisition module 14, and the data acquisition module 14 processes the received Raman spectrum signal and sends it to the data processing module 15, and the data processing module 15 obtains the chemical composition data of the particulate matter according to the Raman spectrum signal, and sends the chemical composition data of the particulate matter to the display screen for real-time display, and controls the LIBS laser 7 to be turned off after the third set time period is reached;

[0077] S32-3: In the fourth sub-stage, the CCD module 17 is first controlled to start and obtain a high-resolution image of the dust falling on the dust collection plate, and then the high-resolution image is sent to the data acquisition module 14. The data acquisition module 14 processes the received high-resolution image and sends it to the data processing module 15. The data processing module 15 obtains the particle dispersion data according to the high-resolution image, and sends the particle dispersion data to the display screen for real-time display. After the fourth set time is reached, the CCD module 17 is controlled to shut down;

[0078] S33: Control the rotary drive mechanism 31 to drive the support frame 30 to rotate 180 degrees, so that the collecting plate 21 originally located on the upper side and the collecting plate 21 originally located on the lower side are exchanged, and then control the rotary drive mechanism 31 to stop the action;

[0079] S34: Control the second flow pump 12 to start working, control the second mass flow controller 11 to start working, and at the same time, control a pair of micro-oscillation motors 24 on the lower collecting plate 21 to vibrate slightly at a set frequency and amplitude; use the second flow pump 12 to extract the external airflow filtered by the filter device as the clean airflow, and pressurize the clean airflow. At the same time, use the second mass flow controller 11 to regulate the flow of the clean airflow, and stabilize the clean airflow, so that the clean airflow enters the dust monitoring chamber 29 at a stable speed and performs a directionally purging on the dust collection plate surface of the lower collecting plate 21 to blow off the dust remaining on the dust collection plate surface. At the same time, use small vibrations to further loosen the residual dust deposited on the dust collection plate surface and quickly fall off, so as to avoid particle accumulation affecting the next detection, and use the particle collection device 23 to collect the fallen dust; after the set time, control the second flow pump 12 to stop working, control the second mass flow controller 11 to stop working, and control the pair of micro-oscillation motors 24 on the lower collecting plate 21 to stop working;

[0080] S35: Repeat S31 to S34 multiple times to perform intermittent detection of dust particles in the coal preparation plant workshop, and simultaneously output particle chemical element data, particle chemical composition data, and particle dispersion data;

[0081] Step 4: End the monitoring operation;

[0082] The data processing module 15 controls the electric valve to close by the drive control module 13, controls the first flow pump 10 and the micro-oscillation motor 24 to stop, controls the second flow pump 12 to stop, controls the first mass flow controller 9 to stop, controls the second mass flow controller 11 to stop, controls the Raman laser 8 to stop, controls the LIBS laser 7 to stop, and controls the spectrometer 6 to stop; controls the power supply module 16 to stop supplying power, thereby terminating the dust particle monitoring operation.

[0083] The present invention provides a multimodal particle detection method for a coal preparation plant workshop, which fully combines Raman spectroscopy and LIBS spectroscopy detection technology to form a multimodal detection technology, and can simultaneously obtain the molecular information and elemental composition of the particles by optimizing the optical path design and the detection process. This multimodal detection method significantly improves the comprehensiveness of particle analysis, and can complete the collection of multi-dimensional information through one detection, avoiding the cumbersome process of multiple detections in the traditional method. Secondly, during the detection process, a micro-oscillation motor is used to achieve uniform distribution of particles on the surface of the collection plate, which effectively solves the problem of signal deviation caused by particle aggregation in the traditional detection process, and significantly improves the accuracy of CCD dispersion test and spectral signal acquisition. In addition, during the detection process, the upper collection plate is used to collect dust, and at the same time, the cleaning mechanism is used to clean the lower collection plate. The continuous detection process is ensured by the mechanism of synchronous combination of collection and cleaning. Through the joint action of the second airflow pump, the second mass flow controller and the oscillation motor, efficient blowing and vibration cleaning of the lower collection plate are achieved. This design not only improves the automation level of the detection process and reduces manual intervention, but also provides a clean collection plate surface for the next round of detection, ensuring the stability of the detection and long-term operation of the equipment.

[0084] The implementation process of this method is simple and the degree of automation is high. It can efficiently and accurately detect dust particles in the environment. At the same time, it can accurately obtain the particle dispersion data, particle chemical composition data and particle chemical element data of the dust particles, which is conducive to ensuring the efficient and safe coal preparation operations.

Claims

1. A multimodal dust particle detection system for a coal preparation plant workshop, comprising a housing (1); characterized in that: It also includes a dust monitoring unit (5) and a control unit (32); The housing (1) has an installation cavity formed inside, an air inlet communicating with the installation cavity is provided on the left side plate, an air outlet communicating with the installation cavity is provided on the right side plate, and an air supply port is provided on the front side plate or the rear side plate; The dust monitoring unit (5) is installed in the installation cavity, and the dust monitoring unit (5) comprises a dust monitoring chamber (29), a continuous collection mechanism, a continuous detection mechanism and a cleaning mechanism; The upper left side of the dust monitoring chamber (29) is connected to a chamber air inlet pipeline (26) in communication with its inner cavity, and the lower right side of the dust monitoring chamber (29) is connected to a chamber air outlet pipeline (27) in communication with its inner cavity; the air inlet end of the chamber air inlet pipeline (26) is connected to the air inlet port on the shell (1), and at the same time, the air inlet end of the chamber air inlet pipeline (26) is connected in series with an electric valve; the air outlet end of the chamber air outlet pipeline (27) is connected to the air outlet port on the shell (1); The continuous collection mechanism comprises a flip motion component (22), a collection plate (21), a micro-oscillation motor (24), a drying pipeline (3), a first mass flow controller (9) and a first flow pump (10); the flip motion component (22) is installed inside the dust monitoring chamber (29), and comprises a support frame (30) and a rotation drive mechanism (31), the support frame (30) is horizontally arranged on the lower side of the dust monitoring chamber (29), the rotation drive mechanism (31) is installed on one side wall of the dust monitoring chamber (29), and its output shaft is connected to one end of the support frame (30) for driving the support frame (30) to rotate around a transverse axis; two collection plates (21) The two collecting plates (21) are installed at the upper and lower ends of the support frame (30) in a relatively vertical manner, and the two plate surfaces on the opposite sides of the two collecting plates (21) serve as two dust collecting plate surfaces, and the two plate surfaces on the adjacent sides serve as two mounting plate surfaces; the dust collecting plate surfaces are engraved with micrometer-level grid lines; two pairs of micro-oscillation motors (24) are respectively installed on the two mounting plate surfaces of the two collecting plates (21); the drying pipeline (3) is located outside the dust monitoring chamber (29) and is serially connected to the middle section of the chamber air inlet pipeline (26); the first mass flow controller (9) and the first flow pump (10) are located outside the dust monitoring chamber (29) and are serially connected to the chamber air outlet pipeline (27) in sequence from the air inlet side to the air outlet side; The continuous detection mechanism comprises a CCD module (17), a Raman laser (8), a LIBS laser (7) and a spectrometer (6); the CCD module (17) is installed on the top of the dust monitoring chamber (29), and its collection window is located inside the dust monitoring chamber (29) and faces the dust collection plate surface of the upper collection plate (21); the Raman laser (8), the LIBS laser (7) and the spectrometer (6) are located outside the dust monitoring chamber (29), and the Raman transmission optical fiber (18) connected to the Raman laser (8) penetrates into the dust monitoring chamber (29), and the output end of the Raman transmission optical fiber (18) faces the dust collection plate surface of the upper collection plate (18); the LIBS transmission optical fiber (19) connected to the LIBS laser (7) penetrates into the interior of the dust monitoring chamber (29), and the output end of the LIBS transmission optical fiber (19) faces the dust collection plate surface of the upper collection plate (18); the receiving optical fiber (20) connected to the spectrometer (6) penetrates into the interior of the dust monitoring chamber (29), and the input end of the receiving optical fiber (20) faces the dust collection plate surface of the upper collection plate (18); The cleaning mechanism comprises a particle collecting device (23), a cleaning air hole (28), a second flow pump (12) and a second mass flow controller (11); the upper end of the particle collecting device (23) is an open structure, which is installed on the bottom side of the dust monitoring chamber (29) and is located below the support frame (30); the cleaning air hole (28) is opened on the side wall of the lower left part of the dust monitoring chamber (29) and is located below the dust collecting plate surface on the lower collecting plate (21); The second flow pump (12) and the second mass flow controller (11) are both located outside the dust monitoring chamber (29), and the air inlet end of the second flow pump (12) is connected to the air supply port on the housing (1) through a clean air inlet pipeline (36), and the air outlet end is connected to the cleaning air hole (28) through a chamber cleaning pipeline (25), wherein the air inlet end of the clean air inlet pipeline (36) is provided with a filtering device; the second mass flow controller (11) is connected in series to the middle section of the chamber cleaning pipeline (25); The control unit comprises a power supply module (16), a drive control module (13), a data acquisition module (14) and a data processing module (15); the power supply module (16) is connected to each electrical component for supplying power; the data acquisition module (14) is respectively connected to a first mass flow controller (9), a CCD module (17), a spectrometer (6) and a second mass flow controller (11); the drive control module (13) is respectively connected to an electric valve, a first flow pump (10), a rotary drive mechanism (31), a micro oscillation motor (24), a second flow pump (12), a first mass flow controller (9), a second mass flow controller (11), a Raman laser (8), a LIBS laser (7) and a spectrometer (6); and the data processing module (15) is respectively connected to the data acquisition module (14) and the drive control module (13).

2. A multimodal dust particle detection system for a coal preparation plant workshop according to claim 1, characterized in that: The air outlet section of the chamber air inlet pipeline (26) is a straight pipe section 1 (33), and the straight pipe section 1 (33) is tilted so that it is higher on the left and lower on the right. At the same time, the air outlet end of the straight pipe section 1 (33) is located above the upper collecting plate (21); the air inlet section of the chamber air outlet pipeline (27) is a straight pipe section 2 (34), and the straight pipe section 2 (34) is tilted so that it is higher on the left and lower on the right. At the same time, the air inlet end of the straight pipe section 2 (34) is located below the lower collecting plate (21); the air outlet section of the chamber cleaning pipeline (25) is a straight pipe section 3 (35), and the straight pipe section 3 (35) is tilted so that it is lower on the left and higher on the right. At the same time, the air outlet end of the straight pipe section 3 (35) is located below the lower collecting plate (21).

3. A multimodal dust particle detection system for a coal preparation plant workshop according to claim 2, characterized in that: The control unit also includes a charging plug (4), in which a charging circuit is built-in and connected to a power supply module (16) via the charging circuit.

4. A multi-modal dust particle detection system for a coal preparation plant workshop according to claim 3, characterized in that: The continuous collection mechanism also includes a cyclone separator (2), which is mounted on the outer side wall of the shell (1) and is serially connected to the air inlet end of the chamber air inlet pipeline (26).

5. A multi-modal dust particle detection system for a coal preparation plant workshop according to claim 4, characterized in that: The data processing module (15) is a PLC controller.

6. A multi-modal dust particle detection system for a coal preparation plant workshop according to claim 5, characterized in that: The output ends of the Raman transmission optical fiber (18) and the LIBS transmission optical fiber (19) are distributed in an inverted eight shape on both sides of the upper collecting plate (21).

7. A multi-modal dust particle detection system for a coal preparation plant according to claim 6, characterized in that: The rotation driving mechanism (31) is a stepping motor.

8. A multi-modal dust particle detection system for a coal preparation plant workshop according to claim 7, characterized in that: The dust collecting plate surface of the collecting plate (21) is coated with a dust tetrafluoroethylene coating.

9. A multi-modal dust particle detection system for a coal preparation plant workshop according to claim 8, characterized in that: The control unit also includes a display screen connected to the data processing module (15), and the display screen is mounted on the outer side wall of the housing (1).

10. A multimodal dust particle detection method in a coal preparation plant workshop, using a multimodal dust particle detection system in a coal preparation plant workshop as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Preparation; First, the multimodal dust particle detection system of the coal preparation plant workshop is placed horizontally in the coal preparation plant workshop; Step 2: System debugging; The power module (16) is used to supply power to start the multi-modal dust particle detection system in the workshop of the coal preparation plant; the Raman laser (8), the LIBS laser (7), the spectrometer (6) and the CCD module (17) are controlled to start working, and the Raman laser (8), the LIBS laser (7) and the spectrometer (6) are debugged respectively, so that the focus of the output light beam of the Raman transmission optical fiber (18) is located on the dust collection plate surface of the upper collection plate (18), the focus of the output light beam of the LIBS transmission optical fiber (19) is located on the dust collection plate surface of the upper collection plate (18), the input end of the receiving optical fiber (20) is aligned with the dust collection plate surface of the upper collection plate (18), and the collection window of the CCD module (17) is focused on the dust collection plate surface of the upper collection plate (18); after the debugging is completed, the Raman laser (8) and the LIBS laser (7) are turned off; Step 3: Dust particle monitoring; S31: Control the electric control valve to open, control the first flow pump (10) to start working, and control the first mass flow controller (9) to start working. The first flow pump (10) is used to provide drainage negative pressure, so that the external air flow to be detected is dried by the drying pipeline (3) and then enters the dust monitoring chamber (29) through the chamber air inlet air path (26). In the process of flowing through the dust monitoring chamber (29), the dust collecting plate surface on the upper side collecting plate (21) is used to collect the fallen dust. The air flow discharged from the dust monitoring chamber (29) is drained to the outside through the chamber air outlet air path (27). In the process of air flow discharge, the first mass flow controller (9) is used to regulate the gas flow through the chamber air outlet air path (27) and stabilize the air flow; S32: After S31 continues for a set time, the electronically controlled valve is controlled to close, and the first flow pump (10) is controlled to stop working, and a stage detection operation of dust particles is performed. During the stage detection operation, four sub-stages of set time are sequentially passed to perform real-time detection operations. The specific process is as follows: S32-1: In the first sub-stage, a pair of micro-oscillation motors (24) on the upper collecting plate (21) are controlled to vibrate slightly at a set frequency and a set amplitude, so that the dust deposited on the dust collecting plate surface forms a more evenly distributed thin layer through the slight vibration, and after reaching a first set time period, the pair of micro-oscillation motors (24) on the upper collecting plate (21) are controlled to stop working; S32-2: In the second sub-stage, the LIBS laser (7) is first controlled to start emitting pulsed laser, and outputted to the dust collection plate through the LIBS transmission optical fiber (19), and the pulsed laser is synchronously used to excite the dust and form plasma. At the same time, the plasma optical signal is received through the receiving optical fiber (20) and transmitted to the spectrometer (6), and the plasma optical signal is analyzed and processed by the spectrometer (6) to obtain the LIBS spectrum signal, and then the LIBS spectrum signal is sent to the data acquisition module (14). The data acquisition module (14) processes the received LIBS spectrum signal and sends it to the data processing module (15). The data processing module (15) obtains the chemical element data of the particulate matter according to the LIBS spectrum signal, and sends the chemical element data of the particulate matter to the display screen for real-time display. After reaching the second set time period, the LIBS laser (7) is controlled to be turned off; S32-3: In the third sub-stage, the Raman laser (8) is first controlled to start emitting laser light, and the laser light is output to the dust collection plate through the Raman transmission optical fiber (18), and the dust molecules are simultaneously excited to vibrate and generate Raman scattered light by the laser light. At the same time, the Raman scattered light is received by the receiving optical fiber (20) and transmitted to the spectrometer (6), and the Raman scattered light is analyzed and processed by the spectrometer (6) to obtain a Raman spectrum signal, and then the Raman spectrum signal is sent to the data acquisition module (14). The data acquisition module (14) processes the received Raman spectrum signal and sends it to the data processing module (15). The data processing module (15) obtains the chemical composition data of the particulate matter according to the Raman spectrum signal, and sends the chemical composition data of the particulate matter to the display screen for real-time display. After reaching the third set time period, the LIBS laser (7) is controlled to be turned off; S32-3: In the fourth sub-stage, the CCD module (17) is first controlled to start and obtain a high-resolution image of the dust falling on the dust collection plate surface, and then the high-resolution image is sent to the data acquisition module (14). The data acquisition module (14) processes the received high-resolution image and sends it to the data processing module (15). The data processing module (15) obtains particle dispersion data based on the high-resolution image, and sends the particle dispersion data to the display screen for real-time display. After reaching the fourth set time, the CCD module (17) is controlled to shut down; S33: controlling the rotary drive mechanism (31) to drive the support frame (30) to rotate 180 degrees, so that the collecting plate (21) originally located on the upper side and the collecting plate (21) originally located on the lower side are interchanged, and then controlling the rotary drive mechanism (31) to stop the action; S34: Control the second flow pump (12) to start working, control the second mass flow controller (11) to start working, and at the same time, control a pair of micro-oscillation motors (24) on the lower collecting plate (21) to perform micro-vibration at a set frequency and a set amplitude; use the second flow pump (12) to extract the external airflow filtered by the filter device as the clean airflow, and pressurize the clean airflow; at the same time, use the second mass flow controller (11) to regulate the flow of the clean airflow and stabilize the clean airflow, so that the clean airflow enters the dust monitoring chamber (29) at a stable speed and performs a directional sweep on the dust collection plate surface of the lower collecting plate (21) to blow off the dust remaining on the dust collection plate surface; at the same time, use micro-vibration to further loosen the residual dust deposited on the dust collection plate surface and quickly fall off, and use the particle collection device (23) to collect the fallen dust; after the set time, control the second flow pump (12) to stop working, control the second mass flow controller (11) to stop working, and control the pair of micro-oscillation motors (24) on the lower collecting plate (21) to stop working; S35: Repeat S31 to S34 multiple times to perform intermittent detection of dust particles in the coal preparation plant workshop, and simultaneously output particle chemical element data, particle chemical composition data, and particle dispersion data; Step 4: End the monitoring operation; The data processing module (15) controls the electric valve to close by controlling the drive control module (13), thereby stopping the first flow pump (10), the micro-oscillation motor (24), the second flow pump (12), the first mass flow controller (9), the second mass flow controller (11), the Raman laser (8), the LIBS laser (7), and the spectrometer (6); and controls the power supply module (16) to stop supplying power, thereby terminating the dust particle monitoring operation.

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