A coal rock identification system, coal mining machine and method based on dust sampling

Abstract

The present application relates to a kind of coal rock identification system based on dust sampling, coal winning machine and method, including sampling tube, negative pressure module, separation drying module, material bin, detection tube, pump unit and LIBS detection device, negative pressure module is used to provide negative pressure suction dust for sampling tube;Separation drying module is used to carry out gas-solid separation and dry processing to dust;Material bin is used to receive the dust particle after drying;Detection tube is communicated with material bin;Pump unit is used to make dust particle in material bin and airflow mix and form gas-solid two-phase flow;LIBS detection device is used to detect dust particle in gas-solid two-phase flow.The present application directly samples the dust near the cutter head of coal winning machine, and carries out gas-solid separation and dry processing to dust, can avoid laser directly acting on dust containing gas, ensure the safety of detection, while dust particle is also not interfered by water mist and gas when detecting, and dust amount required by LIBS detection can also be stably supplied.

Description

Technical Field

[0001] This invention relates to the field of coal and rock identification technology, specifically to a coal and rock identification system, coal mining machine, and method based on dust sampling. Background Technology

[0002] Coal and rock identification is the process of distinguishing coal from rock through various technical means. Currently, the main technical means of coal and rock identification in coal mining include vibration method, infrared spectroscopy method, gamma-ray method and visual recognition method. However, these methods still have relatively low identification accuracy and are easily affected by harsh environments such as high dust, high humidity and light changes underground, resulting in a high misjudgment rate.

[0003] Related technologies mention identification schemes based on dust sampling. However, the environment in coal mine working faces is extremely complex. The dust sampling material is a multiphase aerosol composed of dust, water mist, gas, etc. Moist dust is prone to agglomeration, and gas and water mist can seriously interfere with the laser breakdown and spectral acquisition process of LIBS, leading to misjudgment. Summary of the Invention

[0004] In view of this, the present invention provides a coal and rock identification system based on dust sampling, thereby solving or at least alleviating one or more of the above-mentioned problems and other problems existing in the prior art.

[0005] A second objective of this invention is to provide a coal mining machine.

[0006] A third objective of this invention is to provide a coal and rock identification method using a coal and rock identification system.

[0007] To achieve the aforementioned objectives, the technical solution adopted by the present invention is as follows:

[0008] A coal and rock identification system includes a sampling tube, a negative pressure module, a separation and drying module, a material silo, a detection tube, a pump unit, and a LIBS detection device, wherein...

[0009] The sampling tube has a sampling port, which is set on or near the cutter head of the coal mining machine, and is used to collect dust generated during the coal and rock crushing process.

[0010] The negative pressure module is disposed between the sampling tube and the separation and drying module. The negative pressure module is used to provide negative pressure to the sampling tube to suck up dust, and the separation and drying module is used to perform gas-solid separation of dust and dry the separated dust particles.

[0011] The material silo is located below and connected to the separation and drying module, and is used to receive dried dust particles.

[0012] The detection tube is connected to the material silo;

[0013] The pump unit is used to deliver gas into the detection tube and mix the dust particles in the material bin with the airflow to form a gas-solid two-phase flow.

[0014] The LIBS detection device is used to detect dust particles in the gas-solid two-phase flow inside the detection tube.

[0015] In the aforementioned coal and rock identification system, optionally, the detection tube includes a first pipe section with one end connected to the material bin, a second pipe section with one end connected to the other end of the first pipe section, and a third pipe section with one end connected to the other end of the second pipe section.

[0016] The pump unit includes a first jet pump disposed between the first pipe section and the second pipe section, a second jet pump disposed between the second pipe section and the third pipe section, and an air pump connected to the first jet pump and the second jet pump respectively. The air pump is used to provide airflow to the first jet pump and the second jet pump.

[0017] The LIBS detection device is used to detect dust particles in the gas-solid two-phase flow passing through the second pipe section.

[0018] In the aforementioned coal and rock identification system, optionally, the second pipe section is an opaque pipe, and a detection window is opened on the second pipe section;

[0019] The LIBS detection device includes a laser generator and a spectrometer. The laser emitted by the laser generator is focused onto dust particles in the gas-solid two-phase flow in the second pipe section through the detection window. The spectrometer has a spectral signal receiving probe, which receives spectral signals through the detection window.

[0020] Optionally, a transparent plate is provided on the detection window;

[0021] The first pipe section, the second pipe section, and the third pipe section are all metal pipes.

[0022] In the aforementioned coal and rock identification system, optionally, the sampling tube includes a sampling tube section located near the cutter head of the coal mining machine and a sampling tube section connected to one end of the sampling tube section. The other end of the sampling tube section is a sampling port. The inner diameter of the sampling tube section gradually decreases from the sampling port to the end connected to the sampling tube section.

[0023] Optionally, the separation and drying module is a cyclone separator with a drying function.

[0024] Optionally, the separation and drying module includes a cyclone separator and a drying collection box disposed at the bottom of the cyclone separator. The inlet of the cyclone separator is connected to the outlet of the negative pressure module. The cyclone separator is used to perform gas-solid separation on the collected dust. The separated dust particles are sent to the drying collection box for drying treatment, and the separated gas is discharged from the gas outlet of the cyclone separator. The drying collection box is connected to both the cyclone separator and the material silo.

[0025] Optionally, the drying collection box includes a box body, a heating plate rotatably disposed in the box body, and a drive unit for driving the heating plate to move. The dust particles in the cyclone separator fall onto the heating plate for heating and drying, and the dried dust particles are poured into the material hopper under the rotation of the heating plate.

[0026] The coal and rock identification system also includes a weighing sensor for monitoring the weight of dust particles on the heating plate.

[0027] Optionally, in the aforementioned coal and rock identification system, the coal and rock identification system further includes a control processor, which has a built-in coal and rock identification algorithm, and the control processor is also connected to the LIBS detection device, the separation and drying module, the pump unit, and the negative pressure module via signal connection.

[0028] In the aforementioned coal and rock identification system, the negative pressure module may optionally be a negative pressure fan or an air pump.

[0029] Optionally, in the aforementioned coal and rock identification system, the coal and rock identification system further includes a dust recovery device connected to the detection tube, the dust recovery device being used to recover the dust particles after detection.

[0030] The second technical solution adopted by the present invention is: a coal mining machine, including a machine body, a cutting arm and a cutter head disposed on the cutting arm, characterized in that the coal mining machine further includes the aforementioned coal and rock identification system, and the sampling tube is disposed on the cutting arm.

[0031] The third technical solution adopted by this invention is: a coal and rock identification method, wherein the method employs the aforementioned coal and rock identification system, and the method includes the following steps:

[0032] The coal and rock identification system is activated;

[0033] The negative pressure module draws the dust generated by the cutting head of the coal mining machine into the separation and drying module through the sampling tube along with the airflow;

[0034] The separation and drying module performs gas-solid separation and drying on the incoming dust, and then conveys the dried dust particles to the material silo, while the separated gas is discharged from the separation and drying module.

[0035] The pump unit delivers gas into the detection tube and draws dust particles from the material bin into the detection tube, causing the gas and dust particles to mix and form a gas-solid two-phase flow.

[0036] When the gas-solid two-phase flow passes the detection position of the LIBS detection device, the LIBS detection device is triggered to detect dust particles in the gas-solid two-phase flow and obtain characteristic spectral data.

[0037] The characteristic spectrum is transmitted to the control processor for processing and discrimination to obtain the identification result of coal or rock;

[0038] The coal mining machine adjusts the cutting height based on the identification results.

[0039] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0040] The coal and rock identification system of the present invention directly samples the dust near the cutter head of the coal mining machine and performs gas-solid separation and drying treatment on the dust. This not only avoids the laser directly acting on the gas-containing dust, ensuring the safety of the detection, but also prevents the dust particles from being interfered with by water mist and gas. Furthermore, it can stably supply the amount and continuity of dust required for LIBS detection. Attached Figure Description

[0041] The disclosure of this invention will become more apparent from the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0042] Figure 1 This is a schematic diagram of the structure of a coal and rock identification system based on dust sampling provided in an embodiment of the present invention;

[0043] Figure 2 for Figure 1 A schematic diagram of the sampling tube structure of the coal and rock identification system;

[0044] Figure 3 for Figure 1 A schematic diagram of the second section of the coal and rock identification system and the LIBS detection device;

[0045] Figure 4 This is a schematic diagram of the structure of a coal and rock identification system used on a coal mining machine.

[0046] In the picture:

[0047] 1. Sampling tube; 101. Sampling tube section 1; 102. Sampling tube section 2; 103. Sampling port; 2. Negative pressure module; 3. Cyclone separator; 4. Drying and collecting box; 401. Box body; 402. Heating plate; 5. Material bin; 6. First pipe section; 7. Second pipe section; 8. Third pipe section; 9. Dust recovery device; 10. First jet pump; 11. Second jet pump; 12. Air pump; 13. Detection window; 14. LIBS detection device; 15. Filter; 16. Exhaust pipe; 17. Machine body; 18. Blade head; 19. Cutting arm; 20. Explosion-proof shell. Detailed Implementation

[0048] Referring to the accompanying drawings and specific embodiments, the structure, composition, features, and advantages of the coal and rock identification system of the present invention will be described below by way of example; however, all descriptions should not be construed as limiting the present invention in any way.

[0049] For any single technical feature described or implied in the embodiments submitted herein, or any single technical feature shown or implied in the various drawings, the present invention still operates in any combination or deletion among these technical features or their equivalents without any technical obstacle, and thus these further embodiments according to the present invention should also be considered within the scope of the description herein.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0051] Reference Figure 1 The coal and rock identification system based on dust sampling shown includes a sampling tube 1, a negative pressure module 2, a separation and drying module, a material silo, a detection tube, a pump unit, and a LIBS detection device, wherein:

[0052] The sampling tube 1 has a sampling port, which is set on or near the cutter head of the coal mining machine, and is used to collect dust generated during the coal and rock crushing process.

[0053] See Figure 2 The sampling tube 1 includes a sampling tube section 101 located near the cutter head of the coal mining machine and a sampling tube section 102 connected to one end of the sampling tube section 101. The other end of the sampling tube section 101 is a sampling port 103. The inner diameter of the sampling tube section 101 gradually decreases from the sampling port 103 to the end connected to the sampling tube section 102, forming a contraction shape, which facilitates the sampling and collection of dust.

[0054] During actual construction, the coal mining machine sprays water mist onto the working face during the cutting and crushing process to reduce dust pollution. Additionally, methane gas may be present during coal mining. Therefore, the dust collected by sampling tube 1 will contain both water mist and methane gas. The presence of water mist and methane gas can interfere with the LIBS detection results, and when the concentration of methane gas in the air reaches a certain level, it can easily form an explosive mixture, posing a significant hazard to coal mine safety.

[0055] The negative pressure module 2 is located between the sampling tube 1 and the separation and drying module. The negative pressure module 2 is used to provide negative pressure inside the sampling tube 1 to draw in dust. The separation and drying module is used to perform gas-solid separation of dust and dry the separated dust particles.

[0056] Material bin 5 is located below and connected to the separation and drying module. Material bin 5 is used to receive dried dust particles.

[0057] In some alternative embodiments, the negative pressure module 2 uses a negative pressure fan or an air pump, and the negative pressure fan is an explosion-proof negative pressure fan.

[0058] In some optional embodiments, the separation and drying module includes a cyclone separator 3 and a drying collection box 4 disposed at the bottom of the cyclone separator 3. The inlet of the cyclone separator 3 is connected to the outlet of the negative pressure module 2. The cyclone separator 3 is used to perform gas-solid separation on the collected dust. The separated gas is discharged from the gas outlet of the cyclone separator 3, and an exhaust pipe 16 is connected to the gas outlet. A filter 15 is disposed on the exhaust pipe 16. The fine dust contained in the gas discharged from the cyclone separator 3 is intercepted by the filter 15, and the gas is discharged from the cyclone separator 3 after filtration.

[0059] The drying collection box 4 includes a box body 401, a heating plate 402 rotatably disposed inside the box body 401, and a drive unit for driving the movement of the heating plate 402. The drive unit can be driven by a motor. When receiving wet dust particles, the heating plate 402 is placed horizontally. The wet dust particles in the cyclone separator 3 fall onto the heating plate 402 for heating and drying. After the dust particles are heated and dried, the motor drives the heating plate to flip. The dried dust particles fall into the material bin 5 after the heating plate flips.

[0060] Optionally, the heating plate is rotatably mounted at the bottom of the drying collection box via a horizontally extending shaft, which is driven by a motor.

[0061] The coal and rock identification system also includes a weighing sensor for monitoring the weight of dust particles on the heating plate 402. During the detection process, the weighing sensor can also be used to monitor the dryness of the dust particles.

[0062] Optionally, to facilitate the falling of dust, a vibrator can be installed on the heating plate 402. When the heating plate is flipped, the vibrator is turned on at the same time to shake the dust into the material hopper.

[0063] In some alternative embodiments, the separation and drying module can also use a cyclone separator with drying function to separate and dry dust particles. Drying is achieved simultaneously when dust particles are separated from gas. In this way, the dried dust particles separated by the cyclone separator can be directly transported to the material silo for temporary storage.

[0064] The detection tube is connected to the material silo. The pump unit is used to deliver gas into the detection tube and mix the dust particles in the material silo with the gas to form a gas-solid two-phase flow. The LIBS detection device is used to detect the dust particles in the gas-solid two-phase flow in the detection tube.

[0065] The sampled dust is tested after gas-solid separation and drying. This process avoids direct laser action on the gas-containing dust, ensuring the safety of the test. At the same time, the dust particles are not affected by water mist and gas during the test, and the amount of dust required for LIBS testing can be stably supplied.

[0066] Then by Figure 1 As can be seen, the detection tube includes a first pipe section 6 with one end connected to the material bin 5, a second pipe section 7 with one end connected to the other end of the first pipe section 6, and a third pipe section 8 with one end connected to the other end of the second pipe section 7.

[0067] The pump unit includes a first jet pump 10 disposed between the first pipe section 6 and the second pipe section 7, a second jet pump 11 disposed between the second pipe section 7 and the third pipe section 8, and an air pump 12 connected to the first jet pump 10 and the second jet pump 11 respectively. The air pump 12 is used to provide airflow to the first jet pump 10 and the second jet pump 11. Dust particles in the material bin 5 are drawn into the first pipe section 6 by the airflow under the action of the first jet pump 10, flow through the second pipe section 7, and then enter the third pipe section 8 under the action of the second jet pump 11. The dust particles form a stable gas-solid two-phase flow with the airflow in the detection tube, and the LIBS detection device is used to detect the dust particles in the gas-solid two-phase flow flowing through the second pipe section 7.

[0068] In some alternative embodiments, the second pipe section 7 is a metal pipe, such as a stainless steel pipe, see [link to relevant documentation]. Figure 3 A detection window 13 is provided on the second pipe section 7, through which the LIBS detection device 14 detects dust particles in the gas-solid two-phase flow passing through the second pipe section 7. Optionally, the first pipe section 6 and the third pipe section 8 can also be metal pipes, such as stainless steel pipes.

[0069] When the gas-solid two-phase flow passes through the detection window, the LIBS detection device performs laser breakdown spectroscopy detection on the flowing dust particles through the detection window, realizing online dynamic identification. Furthermore, the flowing dust particles are not affected by being ablated by continuous laser focusing and irradiation, thus the spectral data of the flowing dust particles can be obtained in a better way.

[0070] The LIBS detection device includes a laser generator and a spectrometer. The laser emitted by the laser generator is focused onto the flowing dust particles inside the second pipe section 7 through a detection window. The spectrometer has a spectral signal receiving probe, which receives the spectral signal through the detection window. The laser can be focused onto the central axis of the second pipe section or other locations.

[0071] Optionally, the detection window can be a through hole opened on the second pipe section 7, or a transparent plate can be installed on the through hole to seal the dust particles in the detection tube and prevent the dust particles from leaking out.

[0072] In some alternative embodiments, the coal and rock identification system also includes an explosion-proof enclosure for housing the LIBS detection device.

[0073] The coal and rock identification system also includes a dust recovery device 9 connected to the other end of the third pipe section 8. The dust recovery device 9 is used to filter and purify the detected dust particles, safely collect the dust particles, and ensure the safety of the negative pressure module and the environment.

[0074] The coal and rock identification system also includes a control processor with a built-in coal and rock identification algorithm. The control processor is also connected to the LIBS detection device, cyclone separator, negative pressure module, and pump unit to control the opening and closing of these devices.

[0075] The control processor has a built-in coal and rock identification algorithm. It receives spectral information transmitted by the LIBS detection device, calculates and judges the spectral information, and obtains the identification result of "coal" or "rock". The coal mining machine can automatically adjust the cutting height according to the identification result.

[0076] The control processor can be an industrial computer, a PC, or similar device.

[0077] When the coal and rock identification system is used to sample dust near the cutterhead of a coal mining machine, the collected dust samples contain not only coal dust or rock dust, but also water mist, methane gas, and other gases. Directly using these samples for LIBS detection would severely interfere with the laser breakdown and spectral acquisition processes of LIBS. However, the coal and rock identification system disclosed in this application performs gas-solid separation and drying on the collected samples first, avoiding interference from methane gas, water mist, etc., while also ensuring the required dust quantity and continuity for LIBS detection.

[0078] See Figure 4Another embodiment of the present invention provides a coal mining machine, including a machine body 17, a cutting arm 19 movably disposed on the machine body 17, a cutter head 18 disposed at the end of the cutting arm 19, and the aforementioned coal and rock identification system, wherein the cutter head 18 is used to cut the coal wall.

[0079] Then by Figure 4 As can be seen, the explosion-proof housing 20 of the coal and rock identification system is fixedly connected to the body 17 of the coal mining machine. Components such as the LIBS detection device, cyclone separator, negative pressure fan, pump unit, and control processor are all installed on the body 17 of the coal mining machine and located inside the explosion-proof housing 20. The sampling tube 1 is integrated into the cutting arm 19 of the coal mining machine, and the sampling port of the sampling tube 1 is located on the cutter head 18 of the coal mining machine. The coal and rock identification system is highly integrated into the coal mining machine, realizing the compact and explosion-proof integration of the coal and rock identification system on the coal mining machine.

[0080] Another embodiment of the present invention provides a coal and rock identification method, which employs, as follows: Figures 1 to 3 The coal and rock identification system shown includes the following steps:

[0081] Step S1: Start the coal and rock identification system and proceed to step S2;

[0082] Step S2: Through the negative pressure module 2 and the cyclone separator 3, the dust near the cutting head of the coal mining machine is sucked in through the sampling pipe 1 and transported to the cyclone separator 3 for gas-solid separation.

[0083] In this step, the separated gas is discharged through the exhaust pipe 16 of the cyclone separator, and is filtered by the filter 15 before being discharged; the separated dust particles fall into the drying collection box 4 through the bottom of the cyclone separator 3.

[0084] This step ensures a high airflow rate, guaranteeing the amount of dust required for LIBS testing, and supplying the coal and rock dust needed for LIBS testing.

[0085] Step S3: The falling dust particles are heated by the heating plate 402 in the drying collection box 4. After drying is completed, the motor drives the heating plate 402 to flip and pour the dried dust particles into the material hopper 5.

[0086] In this step, if the weight of the dried dust particles reaches the preset weight value (e.g., above 3g, such as 5g~10g), proceed to the next step. If it is below the preset weight value, the heating plate 402 will collect the dried dust again or the suction volume of the negative pressure module will be adjusted. In actual working conditions, the preset weight is usually easy to achieve.

[0087] Step S4: Gas is pumped into the detection tube by the pump unit, and dust particles in the material bin 5 are drawn into the detection tube to mix the gas and dust particles to form a gas-solid two-phase flow.

[0088] When the gas-solid two-phase flow passes through the detection window of the LIBS detection device, the LIBS detection device is triggered to detect dust particles in the gas two-phase flow and obtain characteristic spectral data.

[0089] Step S5: The characteristic spectral data is transmitted to the control processor for calculation and discrimination to obtain the identification result of coal or rock. The coal mining machine automatically adjusts its cutting height according to the identification result.

[0090] In this step, the identification results of the control processor are fed back to the coal mining machine control system in real time through communication protocols (such as CAN / Ethernet) to guide the operation of the coal mining machine.

[0091] Step S6: After the gas-solid two-phase flow is detected by the LIBS detection device, it enters the dust recovery device 9 to filter and purify the dust-laden airflow, safely collect and discharge or recycle the dust particles, and ensure the safety of the negative pressure module and the environment.

[0092] The coal and rock identification system of this invention also has the following advantages:

[0093] This coal and rock identification system directly samples the dust near the cutter head of the coal mining machine and pre-processes the sample, enabling it to accurately and stably deliver the required amount of dust to the LIBS detection device with continuity.

[0094] This coal and rock identification system uses LIBS technology to directly analyze and identify the spectrum of coal and rock dust, achieving high-precision and fast-response coal and rock discrimination, and enabling real-time and accurate identification of coal and rock.

[0095] The above embodiments are only used to illustrate the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of the present invention, and the patent protection scope of the embodiments of the present invention should be defined by the claims.

Claims

1. A coal-rock identification system for a coal mining machine, characterized by, The coal rock identification system is used for real-time detection in a coal mining process, and comprises a sampling pipe, a negative pressure module, a separation and drying module, a material bin, a detection pipe, a pump unit and a LIBS detection device, wherein The sampling pipe has a sampling port arranged on or near a cutter head of a coal mining machine, and is used for collecting dust generated in a coal rock crushing process; The negative pressure module is arranged between the sampling pipe and the separation and drying module, and is used for providing negative pressure suction for the sampling pipe; the separation and drying module is used for gas-solid separation of the dust and drying treatment of separated dust particles; The material bin is arranged below the separation and drying module and communicates with the separation and drying module, and is used for receiving the dried dust particles; The detection pipe communicates with the material bin; The pump unit is used for conveying gas into the detection pipe and mixing the dust particles in the material bin with the gas flow to form a gas-solid two-phase flow; The detection pipe comprises a first pipe section with one end connected to the material bin, a second pipe section with one end connected to the other end of the first pipe section, and a third pipe section with one end connected to the other end of the second pipe section, and a detection window is arranged on the second pipe section; The LIBS detection device is located outside the detection pipe, and the LIBS detection device detects the dust particles in the gas-solid two-phase flow flowing through the second pipe section through the detection window.

2. The coal rock identification system according to claim 1, wherein The pump unit comprises a first jet pump arranged between the first pipe section and the second pipe section, a second jet pump arranged between the second pipe section and the third pipe section, and a gas pump connected to the first jet pump and the second jet pump respectively, and the gas pump is used for providing gas flow to the first jet pump and the second jet pump.

3. The coal rock identification system of claim 2, wherein, The second pipe section is an opaque pipe; The LIBS detection device comprises a laser generator and a spectrometer, the laser generator emits laser light focused on the dust particles in the gas-solid two-phase flow in the second pipe section through the detection window, and the spectrometer has a spectral signal receiving probe receiving spectral signals through the detection window.

4. The coal rock identification system of claim 3, wherein, A transparent plate is arranged on the detection window; The first pipe section, the second pipe section and the third pipe section are metal pipes.

5. The coal rock identification system of claim 1, wherein, The sampling pipe comprises a first sampling pipe section arranged near the cutter head of the coal mining machine and a second sampling pipe section connected to one end of the first sampling pipe section, the other end of the first sampling pipe section is the sampling port, and the inner diameter of the first sampling pipe section gradually decreases from the sampling port to the end connected to the second sampling pipe section.

6. The coal rock identification system of claim 1, wherein, The separation and drying module is a cyclone separator with drying function, or The separation and drying module comprises a cyclone separator and a drying collection box arranged at the bottom of the cyclone separator, the inlet of the cyclone separator is connected with the outlet of the negative pressure module, the cyclone separator is used for gas-solid separation of collected dust, separated dust particles are sent to the drying collection box for drying treatment, and separated gas is discharged from the gas outlet of the cyclone separator; the drying collection box is in communication with the cyclone separator and the material bin respectively.

7. The coal rock identification system of claim 6, wherein, The drying collection box comprises a box body, a heating plate rotatably arranged in the box body, and a driving unit for driving the heating plate to move, dust particles in the cyclone separator fall to the heating plate for heating and drying, and dried dust particles fall into the material bin under the rotation of the heating plate. The coal and rock identification system further comprises a weighing sensor for monitoring the weight of dust particles on the heating plate.

8. The coal rock identification system according to any one of claims 1 to 7, characterized in that, The coal and rock identification system further comprises a control processor, the control processor is built-in with a coal and rock identification algorithm, and the control processor is in signal connection with the LIBS detection device, the separation and drying module, the pump set and the negative pressure module; and / or, The negative pressure module is a negative pressure fan or an air pump; and / or, The coal and rock identification system further comprises a dust recovery device connected with the detection tube, and the dust recovery device is used for recovering dust particles after detection.

9. A coal winning machine comprising a machine body, a cutting arm and a cutting head provided at the cutting arm, characterized in that The coal winning machine further comprises the coal and rock identification system according to any one of claims 1-8, and the sampling tube is arranged on the cutting arm.

10. A coal rock identification method characterized by, The method adopts the coal and rock identification system according to claim 8, and the method comprises the following steps: Starting the coal and rock identification system; The negative pressure module causes dust generated by the cutter head of the coal winning machine to enter the separation and drying module through the sampling tube along with airflow; The separation and drying module performs gas-solid separation and drying on the entering dust, and then transports the dried dust particles to the material bin, and separates out the gas to discharge the separation and drying module; The pump set transports gas into the detection tube and sucks dust particles in the material bin into the detection tube, so that the gas and the dust particles are mixed to form a gas-solid two-phase flow; When the gas-solid two-phase flow passes through the detection position of the LIBS detection device, the LIBS detection device is triggered to detect dust particles in the gas-solid two-phase flow, and characteristic spectral data is obtained; The characteristic spectral data is transmitted to the control processor for calculation and discrimination, and the identification result of coal or rock is obtained; The coal winning machine adjusts the cutting height according to the identification result.

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