Coal rock recognition system based on dust sampling, coal mining machine and method

Abstract

The invention relates to a coal rock recognition system based on dust sampling, a coal mining machine and a method, the coal rock recognition system comprises a sampling pipe, a negative pressure module, a separating and drying module, a material bin, a detection pipe, a pump unit and an LIBS detection device, the negative pressure module is used for providing negative pressure for the sampling pipe to suck dust; the separating and drying module is used for carrying out gas-solid separation and drying treatment on the dust; the material bin is used for receiving the dried dust particles; the detection pipe is communicated with the material bin; the pump unit is used for mixing dust particles in the material bin with airflow to form gas-solid two-phase flow; and the LIBS detection device is used for detecting dust particles in the gas-solid two-phase flow. The dust near the cutter head of the coal mining machine is directly sampled, and the dust is subjected to gas-solid separation and drying treatment, so that laser can be prevented from directly acting on the gas-containing dust, the detection safety is ensured, dust particles are not interfered by water mist and gas during detection, and the detection accuracy is improved. And the dust amount required by LIBS detection can be stably supplied.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal rock identification, and particularly relates to a coal rock identification system based on dust sampling, a coal winning machine and a method. BACKGROUND

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

[0003] The related technology mentions an identification scheme based on dust sampling. However, the environment of the coal mining face is extremely complex, and the dust sampling material is a multiphase aerosol composed of dust, water mist and gas. The damp dust is easy to clump, and the gas and water mist will seriously interfere with the laser breakdown and spectrum collection process of LIBS, resulting in misjudgment. SUMMARY

[0004] Therefore, the present application provides a coal rock identification system based on dust sampling, thereby solving or at least alleviating one or more of the above problems and other problems in the prior art.

[0005] A second object of the present application is to provide a coal winning machine.

[0006] A third object of the present application is to provide a coal rock identification method using the coal rock identification system.

[0007] In order to achieve the above-mentioned objects, the technical scheme adopted by the present application is as follows:

[0008] A coal rock identification system, comprising 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,

[0009] The sampling pipe has a sampling port, which is arranged on or near the cutter head of the coal winning machine, for collecting dust generated in the coal rock crushing process;

[0010] The negative pressure module is arranged between the sampling pipe and the separation and drying module, and is used to provide negative pressure to the sampling pipe to suck dust. The separation and drying module is used to separate the dust and dry the separated dust particles;

[0011] The material bin is arranged below the separation and drying module and communicates with the separation and drying module. The material bin is used to receive the dried dust particles;

[0012] The detection pipe communicates with the material bin.

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

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

[0015] In the coal rock identification system, the detection tube comprises a first tube segment having one end connected to the material bin, a second tube segment having one end connected to the other end of the first tube segment, and a third tube segment having one end connected to the other end of the second tube segment.

[0016] The pump unit comprises a first jet pump arranged between the first tube segment and the second tube segment, a second jet pump arranged between the second tube segment and the third tube segment, and a gas pump connected to the first jet pump and the second jet pump respectively, the gas pump being configured to provide gas flow to the first jet pump and the second jet pump.

[0017] The LIBS detection device is configured to detect the dust particles in the gas-solid two-phase flow flowing through the second tube segment.

[0018] In the coal rock identification system, the second tube segment is an opaque tube, and a detection window is arranged on the second tube segment.

[0019] 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 tube segment through the detection window, and the spectrometer has a spectral signal receiving probe receiving spectral signals through the detection window.

[0020] Optionally, a transparent plate is arranged on the detection window.

[0021] The first tube segment, the second tube segment, and the third tube segment are metal tubes.

[0022] In the coal rock identification system, the sampling tube comprises a first sampling tube segment arranged close to the cutting head of the coal mining machine and a second sampling tube segment connected to one end of the first sampling tube segment, the other end of the first sampling tube segment is a sampling port, and the inner diameter of the first sampling tube segment gradually decreases from the sampling port to the end connected to the second sampling tube segment.

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

[0024] Optionally, 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 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; and the drying collection box is in communication with the cyclone separator and the material bin respectively.

[0025] Optionally, 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, the dust particles in the cyclone separator fall to the heating plate for heating and drying, and the dried dust particles are poured into the material bin under the rotation of the heating plate.

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

[0027] In the coal rock identification system described above, optionally, the coal rock identification system further comprises a control processor, the control processor is built-in with a coal 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.

[0028] In the coal rock identification system described above, optionally, the negative pressure module is a negative pressure fan or an air pump.

[0029] In the coal rock identification system described above, optionally, the coal rock identification system further comprises a dust recovery device connected with the detection tube, and the dust recovery device is used for recovering the dust particles after detection.

[0030] The second technical scheme of the present application is a coal mining machine, which comprises a machine body, a cutting arm and a cutter head arranged on the cutting arm, and is characterized in that the coal mining machine further comprises the coal rock identification system described above, and the sampling pipe is arranged on the cutting arm.

[0031] The third technical scheme of the present application is a coal rock identification method, which adopts the coal rock identification system described above, and comprises the following steps:

[0032] Starting the coal rock identification system;

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

[0034] The separation and drying module performs gas-solid separation and drying on the entering dust, and then sends the dried dust particles to the material bin, and the separated gas is discharged from the separation and drying module;

[0035] The pump unit 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;

[0036] 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 the dust particles in the gas-solid two-phase flow, and characteristic spectral data is obtained;

[0037] The characteristic spectrum is transmitted to a control processor for calculation and discrimination, and a recognition result of coal or rock is obtained;

[0038] The coal winning machine adjusts the cutting height according to the recognition result.

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

[0040] The coal rock recognition system directly samples dust near the cutter head of the coal winning machine, and performs gas-solid separation and drying treatment on the dust, which can not only avoid the direct action of laser on dust containing gas to ensure the safety of detection, but also can not be disturbed by water mist and gas when the dust particles are detected, and can also stably supply the required dust amount and continuity for LIBS detection. BRIEF DESCRIPTION OF DRAWINGS

[0041] The disclosure of the present application will be more apparent with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application.

[0042] Figure 1 The structure schematic diagram of the coal rock recognition system based on dust sampling provided by the embodiment of the present application is shown in the figure.

[0043] Figure 2 The structure schematic diagram of the sampling tube of the coal rock recognition system is shown in the figure. Figure 1

[0044] Figure 3 The structure schematic diagram of the second tube section and the LIBS detection device of the coal rock recognition system is shown in the figure. Figure 1

[0045] Figure 4 The structure schematic diagram of the coal rock recognition system used on the coal winning machine is shown in the figure.

[0046] In the figure:

[0047] ​​1, sampling pipe; 101, sampling pipe section one; 102, sampling pipe section two; 103, sampling port; 2, negative pressure module; 3, cyclone separator; 4, dry collection 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, tool bit; 19, cutting arm; 20, explosion-proof housing. DETAILED DESCRIPTION

[0048] The structure, composition, characteristics and advantages of the coal rock identification system of the present application will be described below in an exemplary manner with reference to the accompanying drawings and specific examples, however, all the descriptions shall not be used to form any limitation on the present application.

[0049] For any single technical feature described or implied in the embodiments submitted herein, or any single technical feature shown or implied in the drawings, the present application still operates to continue any combination or deletion between these technical features or their equivalents without any technical obstacles, so it should be considered that more embodiments according to the present application are also within the scope of the description herein.

[0050] In addition, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

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

[0052] The sampling pipe 1 has a sampling port, which is arranged on the tool bit of the coal mining machine or near the tool bit of the coal mining machine, for collecting dust generated in the process of breaking coal rock.

[0053] Referring to Figure 2 The sampling pipe 1 includes a sampling pipe section one 101 arranged near the tool bit of the coal mining machine and a sampling pipe section two 102 connected to one end of the sampling pipe section one 101, the other end of the sampling pipe section one 101 is the sampling port 103, the inner diameter of the sampling pipe section one 101 gradually decreases from the sampling port 103 to the end connected to the sampling pipe section two 102, which is in a conical shape, facilitating the collection of dust.

[0054] In actual construction process, the coal mining machine sprays water mist to the working face in the cutting and crushing process to reduce dust pollution, and gas may occur in the coal mining process. Therefore, the dust collected by the sampling pipe 1 contains water mist and gas. The existence of water mist and gas will interfere with the detection result of LIBS, and when the concentration of gas in the air reaches a certain value, it is easy to form an explosive gas mixture, which constitutes a major hidden danger for the safety production of coal mines.

[0055] The negative pressure module 2 is arranged between the sampling pipe 1 and the separation and drying module. The negative pressure module 2 is used to provide negative pressure inside the sampling pipe 1 to suck dust. The separation and drying module is used to separate gas and solid and dry the separated dust particles.

[0056] The material bin 5 is arranged below the separation and drying module and communicates with the separation and drying module. The material bin 5 is used to receive the dried dust particles.

[0057] In some optional embodiments, the negative pressure module 2 adopts a negative pressure fan or an air suction pump. 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 arranged at the bottom of the cyclone separator 3. The inlet of the cyclone separator 3 is connected with the outlet of the negative pressure module 2. The cyclone separator 3 is used to separate gas and solid of the collected dust. The separated gas is discharged from the gas outlet of the cyclone separator 3, and the gas outlet is connected with an exhaust pipe 16. The filter 15 is arranged 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 filtered gas is discharged from the cyclone separator 3.

[0059] The drying collection box 4 includes a box body 401, a heating plate 402 rotatably arranged in the box body 401, and a driving unit for driving the heating plate 402 to move. The driving unit can adopt a motor. When the wet dust particles are received, the heating plate 402 is horizontally extended and placed. The wet dust particles in the cyclone separator 3 fall to the heating plate 402 for heating and drying. After the dust particles are heated and dried, the motor drives the heating plate to overturn. The dried dust particles fall into the material bin 5 after the heating plate overturns.

[0060] Alternatively, the heating plate is rotatably arranged at the bottom of the drying collection box through a rotating shaft extending in the horizontal direction. The motor drives the rotating shaft to rotate.

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

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

[0063] In some optional embodiments, the separation and drying module can also be a cyclone separator with drying function to separate and dry the dust particles. In this way, the dry dust particles separated by the cyclone separator can be directly transported to the material bin for temporary storage.

[0064] The detection tube is connected to the material bin, and the pump unit is used to transport gas into the detection tube and mix the dust particles in the material bin 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 detected after gas-solid separation and drying, which can avoid the direct action of laser on dust containing gas, ensure the safety of detection, and also avoid the interference of water mist and gas on the detection of dust particles, and can also stably supply the required amount of dust for LIBS detection.

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

[0067] The pump unit includes a first jet pump 10 arranged between the first tube segment 6 and the second tube segment 7, a second jet pump 11 arranged between the second tube segment 7 and the third tube segment 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 gas flow to the first jet pump 10 and the second jet pump 11. The dust particles in the material bin 5 are rolled into the first tube segment 6 by the gas flow under the action of the first jet pump 10, flow through the second tube segment 7, and then enter the third tube segment 8 under the action of the second jet pump 11. The dust particles form a stable gas-solid two-phase flow with the gas flow 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 tube segment 7.

[0068] In some optional embodiments, the second tube segment 7 is a metal tube, specifically a stainless steel tube, as shown in Figure 3 A detection window 13 is arranged on the second tube segment 7, and the LIBS detection device 14 detects the dust particles in the gas-solid two-phase flow flowing through the second tube segment 7 through the detection window 13. Optionally, the first tube segment 6 and the third tube segment 8 can also be metal tubes, such as stainless steel tubes.

[0069] When the gas-solid two-phase flow flows through the detection window, the LIBS detection device detects the dust particles in the flow through the detection window to realize online dynamic identification, and the flowing dust particles will not be ablated by the laser focus irradiation, so as to affect the spectral data, and the flowing dust particles can obtain better spectral data.

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

[0071] Optionally, the detection window can be a through hole formed on the second pipe segment 7, and a transparent plate can be arranged on the through hole to seal the dust particles in the detection pipe to prevent the dust particles from leaking out.

[0072] In some optional embodiments, the coal rock identification system further comprises an explosion-proof shell for covering the LIBS detection device.

[0073] The coal rock identification system further comprises a dust recovery device 9 connected to the other end of the third pipe segment 8, which 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 rock identification system further comprises a control processor, which is built-in with a coal rock identification algorithm, and is further connected in signal with the LIBS detection device, the cyclone separator, the negative pressure module and the pump unit to control the opening and closing of these devices.

[0075] The control processor is built-in with a coal rock identification algorithm, receives the spectral information transmitted by the LIBS detection device, and calculates and discriminates the spectral information to obtain the identification result of "coal" or "rock", and 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 computer or the like.

[0077] After the coal rock identification system is used to sample the dust near the cutter head of the coal mining machine, the collected dust sample contains not only coal dust or rock dust, but also water mist, gas and the like, which will seriously interfere with the laser breakdown and spectral acquisition process of LIBS. The coal rock identification system disclosed in the present application is used to separate the gas and solid and dry the collected sample, so as to avoid the interference of gas, water mist and the like on the detection result, and also to ensure the amount and continuity of the dust required by LIBS detection.

[0078] Reference should be made to 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 flows through the detection window position of the LIBS detection device, the LIBS detection device is triggered to detect the dust particles in the gas-solid two-phase flow, and characteristic spectral data is obtained.

[0089] Step S5: The characteristic spectral data is transmitted to the control processor for calculation and discrimination, and the identification result of the coal or rock is obtained.

[0090] In this step, the identification result of the control processor is fed back to the control system of the coal mining machine in real time through a communication protocol (such as CAN / Ethernet), guiding the work 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-containing 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 the embodiment of the present application also has the following advantages:

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

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

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

Claims

1. A coal and rock identification system, characterized in that, The 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. 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. 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. The material silo is located below and connected to the separation and drying module, and is used to receive dried dust particles. 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 bin with the airflow to form a gas-solid two-phase flow. The LIBS detection device is used to detect dust particles in the gas-solid two-phase flow inside the detection tube.

2. The coal and rock identification system according to claim 1, characterized in that, The detection tube includes a first tube segment with one end connected to the material bin, a second tube segment with one end connected to the other end of the first tube segment, and a third tube segment with one end connected to the other end of the second tube segment. 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. The LIBS detection device is used to detect dust particles in the gas-solid two-phase flow passing through the second pipe section.

3. The coal and rock identification system according to claim 2, characterized in that, The second pipe section is an opaque pipe, and an inspection window is opened on the second pipe section; 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.

4. The coal and rock identification system according to claim 3, characterized in that, A transparent panel is provided on the detection window; The first pipe section, the second pipe section, and the third pipe section are all metal pipes.

5. The coal and rock identification system according to claim 1, characterized in that, The sampling tube includes a first sampling tube section located near the cutter head of the coal mining machine and a second sampling tube section connected to one end of the first sampling tube section. The other end of the first sampling tube section is the sampling port. The inner diameter of the first sampling tube section gradually decreases from the sampling port to the end connected to the second sampling tube section.

6. The coal and rock identification system according to claim 1, characterized in that, The separation and drying module is a cyclone separator with drying function, or; The separation and drying module includes a cyclone separator and a drying collection box located 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. 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.

7. The coal and rock identification system according to claim 6, characterized in that, The drying and collecting 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. Dust particles in the cyclone separator fall onto the heating plate for heating and drying. The dried dust particles are poured into the material hopper under the rotation of the heating plate. The coal and rock identification system also includes a weighing sensor for monitoring the weight of dust particles on the heating plate.

8. The coal and rock identification system according to any one of claims 1 to 7, characterized in that, The coal and rock identification system also includes a control processor, which has a built-in coal and rock identification algorithm. The control processor is also signal-connected to the LIBS detection device, the separation and drying module, the pump unit, and the negative pressure module; and / or, The negative pressure module is a negative pressure fan or air pump; and / or, The coal and rock identification system also includes a dust recovery device connected to the detection tube, which is used to recover the dust particles after detection.

9. A coal mining machine, comprising a machine body, a cutting arm, and a cutter head disposed on the cutting arm, characterized in that, The coal mining machine also includes the coal and rock identification system according to any one of claims 1 to 8, wherein the sampling tube is disposed on the cutting arm.

10. A method for coal and rock identification, characterized in that, The method employs the coal and rock identification system of claim 8, and the method includes the following steps: The coal and rock identification system is activated; 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; 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. 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. 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. The characteristic spectrum is transmitted to the control processor for processing and discrimination to obtain the identification result of coal or rock; The coal mining machine adjusts the cutting height based on the identification results.

Images