Multispectral solid mineral online detection device and method

Abstract

The invention provides a multispectral solid mineral on-line detection device and method, and relates to the technical field of solid mineral on-line detection.The multispectral solid mineral on-line detection device comprises a rack, a protection box is arranged in the rack, a detection box is arranged on the upper surface of the rack, an LIBS device and an NIRS device are arranged in the detection box, and the protection box is arranged on the upper surface of the rack. The LIBS device comprises a laser light source, paired reflectors, a polarization beam splitter, a two-phase color mirror I, a plano-concave lens, a plano-convex lens I, a two-phase color mirror II, a plano-convex lens II and an optical fiber collecting lens I; according to the device, LIBS and NIRS technologies are combined for the first time, meanwhile, LIBS and NIRS spectrum acquisition systems are integrated, LIBS and NIRS spectrum data of minerals can be obtained in real time, the two kinds of spectrum data are organically combined through a data fusion algorithm, multispectral fusion detection of solid mineral components is achieved, and the accuracy, comprehensiveness and reliability of mineral component detection are improved through multi-source data complementation.

Description

Technical Field

[0001] The invention relates to the technical field of solid mineral online detection, and in particular to a multi-spectral solid mineral online detection device and method. Background Art

[0002] In the field of solid mineral detection, traditional detection methods such as X-ray fluorescence spectroscopy (XRF) and electron probe microanalysis (EPMA), although with high detection accuracy, often have disadvantages such as complex sample pretreatment, slow detection speed, and expensive equipment. In recent years, laser induced breakdown spectroscopy (LIBS) and near-infrared spectroscopy (NIRS) technology have gradually become a research hotspot in the field of mineral detection due to their advantages such as rapid, non-destructive, and simultaneous multi-element detection.

[0003] LIBS generates laser plasma by incidenting a focused strong laser beam on the surface of a mineral, and performs elemental analysis on the emission spectrum of atoms and ions in the plasma. This technology has the advantages of no need for sample pretreatment, rapid, non-destructive testing, and high sensitivity. It is suitable for the detection of substances in various physical states such as solids, liquids, and gases. However, the accuracy of LIBS technology in elemental quantitative analysis is still subject to certain limitations, especially in the detection of complex mineral matrices. NIRS achieves quantitative analysis of mineral components by measuring the absorption, reflection or transmission spectra of minerals in the near-infrared region, combined with chemometric methods. NIRS technology has the advantages of rapid, non-destructive, and simultaneous detection of multiple components. It is widely used in agriculture, food, pharmaceuticals and other fields, but in mineral detection, its detection accuracy and sensitivity may be affected by the complexity of mineral components and spectral overlap.

[0004] Therefore, we propose a multi-spectral solid mineral online detection device and method to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to propose a multi-spectral solid mineral online detection device and method combining LIBS and NIRS technology, aiming to overcome the shortcomings of single spectral technology in mineral detection and improve detection accuracy and efficiency.

[0006] The purpose of the present invention can be achieved through the following technical scheme: comprising a frame, a protective box is arranged inside the frame, and a shaping belt is arranged inside the protective box, a detection box is arranged on the upper surface of the frame, a LIBS device and a NIRS device are arranged inside the detection box, the LIBS device comprises a laser light source, a pair of reflectors, a polarization beam splitter, a dichroic mirror 1, a plano-concave lens, a plano-convex lens 1, a dichroic mirror 2, a plano-convex lens 2, an optical fiber collecting lens 1, an electrically controlled translation stage 2 and a window sheet 1, and the laser light source, the pair of reflectors, the polarization beam splitter, the dichroic mirror 1, the plano-concave lens, the plano-convex lens 1, the dichroic mirror 2, the plano-convex lens 2, the optical fiber collecting lens 1, the electrically controlled translation stage 2 and a window sheet 1 The mounting plate is arranged inside the left side of the detection box, the laser light source, polarization beam splitter and dichroic mirror 1 are arranged on the mounting plate in sequence from left to right, the paired reflectors are arranged on the front and back sides of the polarization beam splitter respectively, the dichroic mirror 1, plano-concave lens, plano-convex lens 1, dichroic mirror 2, plano-convex lens 2 and window piece 1 are arranged on the mounting plate in sequence from top to bottom, the optical fiber collecting lens 1 is arranged on the rear side of the dichroic mirror 2, the electric-controlled translation stage 2 is arranged on the right side of the plano-convex lens 2 and connected to the plano-convex lens 2, the NIRS device includes a near-infrared light source, an optical fiber collecting lens 2 and a window piece 2, and the near-infrared light source and the optical fiber collecting lens 2 are both arranged inside the lower right end of the detection box through a mounting block.

[0007] As a preferred embodiment of the present invention, the inner top wall of the protective box is provided with displacement sensor 1, a scraper and displacement sensor 2 in sequence from right to left, and displacement sensor 2 is arranged below the right end of the detection box body, and an electric-controlled translation stage 1 is arranged on the upper end of the scraper, and the electric-controlled translation stage 1 is arranged on the upper surface of the protective box.

[0008] As a preferred embodiment of the present invention, a transparent window 1 and a transparent window 2 are opened at the upper end of the protective box, and transparent window 1 and transparent window 2 are both arranged on the left side of displacement sensor 2, window piece 1 is located directly above transparent window 1, and window piece 2 is located directly above transparent window 2.

[0009] As a preferred embodiment of the present invention, a multi-channel fiber optic spectrometer is arranged on the rear side of the laser light source, an energy meter is arranged on the upper end of the polarization beam splitter, a laser rangefinder is arranged on the rear side of the plano-concave lens, and the multi-channel fiber optic spectrometer and the laser rangefinder are both arranged on a mounting plate.

[0010] As a preferred embodiment of the present invention, a timing controller is provided on the right side wall of the mounting plate, a sheet metal protective cover is provided on the upper surface of the mounting plate, and a heat dissipation module is provided on the upper surface of the sheet metal protective cover.

[0011] As a preferred embodiment of the present invention, a UPS power supply is arranged at the right inner bottom of the protection box, a cabinet door is hinged on the front of the protection box, and a power supply button and a laser light source button are arranged on the surface of the cabinet door.

[0012] As a preferred embodiment of the present invention, a multi-spectral solid mineral online detection method specifically comprises the following steps:

[0013] Step 1: When the device is running, the sample to be tested placed on the upper right side of the shaping belt is moved from right to left through the shaping belt. When the sample to be tested passes through the displacement sensor 1, the displacement sensor 1 will detect the height of the sample to be tested. When the sample to be tested is too high, the electric control translation stage 1 will work to drive the scraper to drop a certain height, so that when the sample to be tested flows through the scraper, the scraper will shape the sample to avoid excessive accumulation of the sample affecting the subsequent detection effect;

[0014] Step 2, when the sample after scraper shaping flows to the bottom of transparent window 1, first, the electric control platform 1 works to drive the plano-convex lens 2 to move in the vertical direction, and adjusts the focus so that the laser focusing spot is located on the surface of the sample flow after shaping. The laser light source emits a pulsed laser. The pulsed laser first directs the light to the polarization beam splitter through the front reflector, and then the polarization beam splitter directs the light to the dichroic mirror 1 through the rear reflector. The light is refracted downward by the dichroic mirror 1, and then the light passes through the plano-concave lens, plano-convex lens 1, dichroic mirror 2, plano-convex lens 2, window piece 1 and transparent window 1 in sequence, and is focused on the mineral sample after beam expansion and focusing through each device on the optical path, and the sample to be tested is excited to generate plasma. The spectral signal emitted by the plasma is incident on the dichroic mirror 2, reflected and collected on the optical fiber collection lens 1, and the optical fiber collection lens 1 transmits the spectral signal emitted by the plasma to the multi-channel optical fiber spectrometer through the optical fiber, and the multi-channel optical fiber spectrometer transmits the spectral signal to the computer;

[0015] Step three, the sample continues to flow to the left. When the sample flows to the displacement sensor 2, the displacement sensor 2 detects whether the sample height is qualified. When the sample height is appropriate, the subsequent work can continue to be carried out, so that the sample continues to move to the left. When the sample moves to the bottom of the transparent window 2, the near-infrared light source works, and the emitted light passes through the window piece 2 and irradiates the mineral sample to be tested. The reflected light of the sample to be tested passes through the window piece 2 and enters the optical fiber collecting lens 2 for collection. The optical fiber collecting lens 2 generates a spectrum with the collected reflected light of the sample to be tested. The spectral signal is transmitted to the multi-channel optical fiber spectrometer through the optical fiber. The multi-channel optical fiber spectrometer transmits the spectral signal to the computer, and the coal quality is analyzed through the spectrum. Then, the computer calculates the elemental composition and elemental content in the sample to be tested based on the relationship between the calibrated elemental composition and elemental content and the spectral signal, so as to realize the online detection of the elemental composition and industrial indicators of solid minerals.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The device combines LIBS and NIRS technologies for the first time, and integrates LIBS and NIRS spectral acquisition systems at the same time, which can obtain LIBS and NIRS spectral data of minerals in real time. Through the data fusion algorithm, the two spectral data are organically combined to realize multi-spectral fusion detection of solid mineral components. Through the complementarity of multi-source data, the accuracy, comprehensiveness and reliability of mineral component detection are improved;

[0018] (2) Use advanced chemometric methods and machine learning algorithms to preprocess, extract features, and build models for LIBS and NIRS spectral data, conduct in-depth mining and intelligent analysis of spectral data, and improve the prediction accuracy and generalization ability of the model by optimizing algorithm parameters.

[0019] (3) The device is designed as an embedded platform with real-time online detection function. It can realize real-time online detection of solid mineral samples, meet the needs of rapid and accurate detection of mineral components in industrial production, and improve detection efficiency and automation level through automated control and data processing processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a front cutaway perspective view of the protection box of the present invention;

[0023] Figure 3 It is a front sectional perspective view of the detection box of the present invention;

[0024] Figure 4 It is a left-side cutaway perspective view of the detection box of the present invention;

[0025] Figure 5 1 is a flowchart of the LIBS device and the NIRS device of the present invention.

[0026] In the figure: 1. frame; 2. protection box; 3. shaping belt; 4. detection box; 5. transparent window 1; 6. transparent window 2; 7. displacement sensor 1; 8. displacement sensor 2; 9. electric control translation stage 1; 10. scraper; 11. laser light source; 12. paired reflectors; 13. polarization beam splitter; 14. energy meter; 15. dichroic mirror 1; 16. plano-concave lens; 17. plano-convex lens 1; 18. dichroic mirror 2; 19. plano-convex lens 2; 20. multi-channel fiber optic spectrometer; 21. fiber optic collecting lens 1; 22. electric control translation stage 2; 23. laser rangefinder; 24. near-infrared light source; 25. fiber optic collecting lens 2; 26. timing controller; 27. heat dissipation module; 28. UPS power supply; 29. ​​window piece 1; 30. window piece 2; 31. mounting plate. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1:

[0029] See also Figure 1 - Figure 5As shown, a multi-spectral solid mineral online detection device includes a frame 1, a protection box 2 is arranged inside the frame 1, and a shaping belt 3 is arranged inside the protection box 2, a detection box 4 is arranged on the upper surface of the frame 1, and a LIBS device and a NIRS device are arranged inside the detection box 4, the material detection light path of the LIBS device is set to be perpendicular to the transmission direction of the sample to be tested, and the material detection light path of the NIRS device is set to be inclined at a certain angle to the transmission direction of the sample to be tested, and the LIBS device includes a laser light source 11, a pair of reflectors 12, a polarization beam splitter 13, and two Phase color mirror 15, plano-concave lens 16, plano-convex lens 17, dichroic mirror 2 18, plano-convex lens 2 19, optical fiber collecting lens 1 21, electrically controlled translation stage 2 22 and window piece 1 29, and laser light source 11, paired reflectors 12, polarization beam splitter 13, dichroic mirror 15, plano-concave lens 16, plano-convex lens 17, dichroic mirror 2 18, plano-convex lens 2 19, optical fiber collecting lens 1 21, electrically controlled translation stage 2 22 are all arranged inside the left side of the detection box 4 through the mounting plate 31, and the dichroic mirror 15 and the dichroic mirror 2 18 are both mounted at 45 degrees to the optical axis The laser light source 11, the polarization beam splitter 13 and the dichroic mirror 15 are arranged on the mounting plate 31 from left to right in sequence, and the paired reflectors 12 are arranged on the front and rear sides of the polarization beam splitter 13, respectively, so that the light emitted by the laser light source 11 can be smoothly refracted to the dichroic mirror 15 through the paired reflectors 12 and the polarization beam splitter 13, and the dichroic mirror 15, the plano-concave lens 16, the plano-convex lens 17, the dichroic mirror 2 18, the plano-convex lens 2 19 and the window sheet 29 are arranged on the mounting plate 31 from top to bottom in sequence, so that the light can be focused to the sample after passing through the above devices. , and then the sample is successfully excited to generate plasma. The optical fiber collection lens 1 21 is arranged at the rear side of the dichroic mirror 18 and connected to the frame of the dichroic mirror 18. At the same time, the optical fiber collection lens 1 21 is installed vertically in the optical axis direction, so that the reflected light is collected to the optical fiber collection lens 1 21 through the dichroic mirror 18. The electric-controlled translation stage 2 22 is arranged on the right side of the plano-convex lens 19 and connected to the plano-convex lens 19. The electric-controlled translation stage 2 22 can adjust the plano-convex lens 19 in the vertical direction, so that the plano-convex lens 19 can quickly focus on the sample, thereby improving the detection speed of the sample;

[0030] It should be noted that the paired reflectors 12 at the front end are arranged on the left side of the polarization beam splitter 13, and the paired reflectors 12 at the rear end are arranged on the right side of the polarization beam splitter 13, and the refractive surfaces of the two reflectors are facing the polarization beam splitter 13, so that the paired reflectors 12 at the front end can smoothly refract the light emitted from the laser light source 11 to the polarization beam splitter 13, and then refract the light to the dichroic mirror 15 through the polarization beam splitter 13 and the paired reflectors 12 at the rear end.

[0031] The NIRS device includes a near-infrared light source 24, a fiber optic collecting lens 25 and a window piece 30. The near-infrared light source 24 and the fiber optic collecting lens 25 are both arranged inside the lower right end of the detection box 4 through a mounting block; wherein, the near-infrared light source 24 and the fiber optic collecting lens 25 are both arranged at an angle, and the light path emitted by the near-infrared light source 24 is inclined at a certain angle to the transmission direction of the sample to be tested, and the refracted light path is also inclined at a certain angle to the transmission direction of the sample to be tested, so that it is smoothly refracted to the fiber optic collecting lens 25 for collection.

[0032] The inner top wall of the protection box 2 is provided with a displacement sensor 1 7, a scraper 10 and a displacement sensor 2 8 in sequence from right to left, and the displacement sensor 2 8 is arranged below the right end of the detection box 4, the upper end of the scraper 10 is provided with an electric control translation stage 1 9, and the electric control translation stage 1 9 is arranged on the upper surface of the protection box 2, and the upper end of the protection box 2 is provided with a transparent window 1 5 and a transparent window 2 6, and the transparent window 1 5 and the transparent window 2 6 are both arranged on the left side of the displacement sensor 2 8, the window piece 1 29 is located directly above the transparent window 1 5, and the window piece 2 30 is located directly above the transparent window 2 6;

[0033] It should be noted that the shaping belt is used to shape and adjust the sample flow according to the flow rate to prevent the sample flow from being blocked, scattered or deviated. The laser focus and light irradiation position are then adjusted according to the displacement sensor to avoid the influence of the ups and downs of the sample flow on the detection results.

[0034] A multi-channel fiber optic spectrometer 20 is arranged on the rear side of the laser light source 11, and an energy meter 14 is arranged on the upper end of the polarization beam splitter 13. The energy meter 14 can measure the UV energy of different light sources, so that the polarization beam splitter 13 passes the laser beam through the energy meter 14 to monitor and ensure that the laser energy meets the detection requirements. A laser rangefinder 23 is arranged on the rear side of the plano-concave lens 16. The multi-channel fiber optic spectrometer 20 and the laser rangefinder 23 are both arranged on a mounting plate 31. A timing controller 26 is arranged on the right side wall of the mounting plate 31. A sheet metal protective cover is arranged on the upper surface of the mounting plate 31. The sheet metal protective cover can protect the multi-channel fiber optic spectrometer 20 and the laser rangefinder 23 below, thereby improving the safety of the multi-channel fiber optic spectrometer 20 and the laser rangefinder 23. Safety performance, and a heat dissipation module 27 is arranged on the upper surface of the sheet metal protective cover, which can discharge the heat generated by the multi-channel fiber optic spectrometer 20 and the laser rangefinder 23 when they are working, so as to avoid the heat accumulation inside the box body and affect the use effect and service life of the electrical components. A UPS power supply 28 is arranged on the right inner bottom of the protective box 2, which can provide a power source for all the equipment requiring power inside the protective box 2, so that the detection work can be carried out smoothly. The front of the protective box 2 is hinged with a cabinet door, and the surface of the cabinet door is provided with a power supply button and a laser light source button. The setting of the power supply button and the laser light source button is convenient for the staff to control the opening and closing of the equipment through the power supply button and the laser light source button;

[0035] It should be noted that the device and method are not only suitable for the detection of solid minerals, but can also be extended to multispectral detection applications in other fields. Its innovative multispectral fusion technology and intelligent algorithm optimization method provide new ideas and methods for the development of spectral detection technology.

[0036] Embodiment 2:

[0037] Please refer to Figure 1 , Figure 3 and Figure 5 As shown, the present invention also discloses a multi-spectral solid mineral online detection method, which specifically includes the following steps:

[0038] Step 1: When the device is running, the sample to be tested placed on the upper right side of the shaping belt 3 is moved from right to left through the shaping belt 3. When the sample to be tested passes through the displacement sensor 7, the displacement sensor 7 will detect the height of the sample to be tested. When the sample to be tested is too high, the electric control translation platform 9 will work to drive the scraper 10 to drop a certain height, so that when the sample to be tested flows through the scraper 10, the scraper 10 will shape the sample to avoid excessive accumulation of the sample affecting the subsequent detection effect;

[0039] Step 2, when the sample after scraper shaping flows to the bottom of transparent window 15, first the electric control platform 19 works to drive the plano-convex lens 2 19 to move in the vertical direction, and adjust the focus so that the laser focus spot is located on the surface of the sample flow after shaping. The laser light source 11 emits a pulsed laser, which first passes through the front mirror to direct the light to the polarization beam splitter 13, and then the polarization beam splitter 13 directs the light to the dichroic mirror 15 through the rear mirror, and the light is refracted downward by the dichroic mirror 15, and then the light passes through the dichroic mirror 15 in sequence. Through the plano-concave lens 16, plano-convex lens 17, dichroic mirror 18, plano-convex lens 19, window piece 29 and transparent window 5, the light is focused on the mineral sample after beam expansion and focusing through various equipment on the optical path, and the sample to be tested is excited to generate plasma. The spectral signal emitted by the plasma is incident on the dichroic mirror 18, reflected and collected by the optical fiber collecting lens 21, and the optical fiber collecting lens 21 transmits the spectral signal emitted by the plasma to the multi-channel optical fiber spectrometer 20 through the optical fiber, and the multi-channel optical fiber spectrometer 20 transmits the spectral signal to the computer;

[0040] Step three, the sample continues to flow to the left. When the sample flows to the displacement sensor 28, the displacement sensor 28 detects whether the sample height is qualified. When the sample height is appropriate, subsequent work can continue to be carried out, so that the sample continues to move to the left. When the sample moves to the bottom of the transparent window 26, the near-infrared light source 24 works, and the emitted light passes through the window piece 230 to irradiate the mineral sample to be tested. The reflected light of the sample to be tested passes through the window piece 230 and enters the optical fiber collecting lens 25 for collection. The optical fiber collecting lens 25 generates a spectrum with the collected reflected light of the sample to be tested. The spectral signal is transmitted to the multi-channel optical fiber spectrometer 20 through the optical fiber. The multi-channel optical fiber spectrometer 20 transmits the spectral signal to the computer, and the coal quality is analyzed through the spectrum. Then, the computer calculates the elemental composition and elemental content in the sample to be tested based on the relationship between the calibrated elemental composition and elemental content and the spectral signal, so as to realize the online detection of the elemental composition and industrial indicators of solid minerals.

[0041] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-spectral solid mineral online detection device, comprising a frame (1), a protection box (2) is arranged inside the frame (1), and a shaping belt (3) is arranged inside the protection box (2), characterized in that: The upper surface of the frame (1) is provided with a detection box (4), and the detection box (4) is provided with a LIBS device and a NIRS device inside. The LIBS device comprises a laser light source (11), a pair of reflectors (12), a polarization beam splitter (13), a dichroic mirror (15), a plano-concave lens (16), a plano-convex lens (17), a dichroic mirror (18), a plano-convex lens (19), an optical fiber collecting lens (21), an electrically controlled translation stage (22), and a window piece (29). The laser light source (11), the pair of reflectors (12), the polarization beam splitter (13), the dichroic mirror (15), the plano-concave lens (16), the plano-convex lens (17), the dichroic mirror (18), the plano-convex lens (19), an optical fiber collecting lens (21), and an electrically controlled translation stage (22) are all arranged inside the left side of the detection box (4) through a mounting plate (31). The laser light source (11) 1), a polarization beam splitter (13) and a dichroic mirror (15) are sequentially arranged on a mounting plate (31) from left to right, the paired reflectors (12) are respectively arranged on the front and rear sides of the polarization beam splitter (13), the dichroic mirror (15), a plano-concave lens (16), a plano-convex lens (17), a dichroic mirror (18), a plano-convex lens (19) and a window piece (29) are sequentially arranged on the mounting plate (31) from top to bottom, the optical fiber collecting lens (1) (21) is arranged on the rear side of the dichroic mirror (18), the electric control translation stage (22) is arranged on the right side of the plano-convex lens (19) and connected to the plano-convex lens (19), the NIRS device comprises a near-infrared light source (24), an optical fiber collecting lens (25) and a window piece (30), the near-infrared light source (24) and the optical fiber collecting lens (25) are both arranged inside the lower right end of the detection box (4) through a mounting block.

2. A multi-spectral solid mineral online detection device according to claim 1, characterized in that: The inner top wall of the protection box (2) is provided with a displacement sensor 1 (7), a scraper (10) and a displacement sensor 2 (8) in sequence from right to left, and the displacement sensor 2 (8) is arranged below the right end of the detection box (4), and the upper end of the scraper (10) is provided with an electric-controlled translation platform 1 (9), and the electric-controlled translation platform 1 (9) is arranged on the upper surface of the protection box (2).

3. A multi-spectral solid mineral online detection device according to claim 2, characterized in that: The upper end of the protection box (2) is provided with a transparent window one (5) and a transparent window two (6), and the transparent window one (5) and the transparent window two (6) are both arranged on the left side of the displacement sensor two (8), the window piece one (29) is located directly above the transparent window one (5), and the window piece two (30) is located directly above the transparent window two (6).

4. A multi-spectral solid mineral online detection device according to claim 1, characterized in that: A multi-channel optical fiber spectrometer (20) is arranged on the rear side of the laser light source (11), an energy meter (14) is arranged on the upper end of the polarization beam splitter (13), a laser rangefinder (23) is arranged on the rear side of the plano-concave lens (16), and the multi-channel optical fiber spectrometer (20) and the laser rangefinder (23) are both arranged on a mounting plate (31).

5. A multi-spectral solid mineral online detection device according to claim 4, characterized in that: A timing controller (26) is provided on the right side wall of the mounting plate (31), a sheet metal protective cover is provided on the upper surface of the mounting plate (31), and a heat dissipation module (27) is provided on the upper surface of the sheet metal protective cover.

6. A multi-spectral solid mineral online detection device according to claim 1, characterized in that: A UPS power supply (28) is arranged at the right inner bottom of the protection box (2), a cabinet door is hingedly connected to the front of the protection box (2), and a power supply button and a laser light source button are arranged on the surface of the cabinet door.

7. A multi-spectral solid mineral online detection method, characterized in that: The specific steps include: Step 1: When the device is running, the sample to be tested placed on the upper right side of the shaping belt (3) is moved from right to left through the shaping belt (3). When the sample to be tested passes through the displacement sensor 1 (7), the displacement sensor 1 (7) detects the height of the sample to be tested. When the sample to be tested is too high, the electric control translation platform 1 (9) is operated to drive the scraper (10) to descend to a certain height, so that when the sample to be tested flows through the scraper (10), the scraper (10) will shape the sample to avoid excessive accumulation of the sample and affect the subsequent detection effect. Step 2: When the sample after being shaped by the scraper flows to the bottom of the transparent window 1 (5), the electric control platform 1 (9) first drives the plano-convex lens 2 (19) to move in the vertical direction, and adjusts the focus so that the laser focusing spot is located on the surface of the sample flow after shaping. The laser light source (11) emits a pulsed laser, which first passes through the front mirror to direct the light to the polarization beam splitter (13), and then the polarization beam splitter (13) directs the light to the dichroic mirror 1 (15) through the rear mirror. The light is refracted downward by the dichroic mirror 1 (15), and then the light passes through the plano-concave lens 1 (19) in sequence. The lens (16), the first plano-convex lens (17), the second dichroic mirror (18), the second plano-convex lens (19), the first window (29) and the first transparent window (5) are focused on the mineral sample after beam expansion and focusing by various devices on the optical path, and the sample to be tested is excited to generate plasma. The spectral signal emitted by the plasma is incident on the second dichroic mirror (18), reflected and collected by the first optical fiber collection lens (21), and the first optical fiber collection lens (21) transmits the spectral signal emitted by the plasma to the multi-channel optical fiber spectrometer (20) through the optical fiber, and the multi-channel optical fiber spectrometer (20) transmits the spectral signal to the computer; Step 3, the sample continues to flow to the left. When the sample flows to the displacement sensor 2 (8), the displacement sensor 2 (8) detects whether the sample height is qualified. When the sample height is appropriate, subsequent work can be continued, so that the sample continues to move to the left. When the sample moves to the bottom of the transparent window 2 (6), the near-infrared light source (24) works, and the emitted light passes through the window piece 2 (30) and irradiates the mineral sample to be tested. The reflected light of the sample to be tested passes through the window piece 2 (30) and enters the optical fiber collecting lens 2 (25) for collection. The optical fiber collecting lens 2 (25) generates a spectrum of the collected reflected light of the sample to be tested. The spectrum signal is transmitted to the multi-channel optical fiber spectrometer (20) through the optical fiber. The multi-channel optical fiber spectrometer (20) transmits the spectrum signal to the computer. The coal quality analysis is performed through the spectrum. Then, the computer calculates the element composition and element content in the sample to be tested based on the relationship between the calibrated element composition and element content and the spectrum signal, thereby realizing online detection of the element composition and industrial indicators of solid minerals.

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