Experimental device for simulating influence of underground environment on near infrared spectrum of coal rock

Abstract

The invention discloses an experimental device for simulating the influence of an underground environment on a coal rock near infrared spectrum, and belongs to the technical field of underground environment simulation experiments. The device comprises a simulation box, an objective table, a near-infrared spectrometer, an optical fiber probe, a linear moving mechanism, a stepless speed regulation air pump and a temperature control mechanism, the objective table is located in the simulation box, one end of the optical fiber probe is connected with the near-infrared spectrometer, and the other end of the optical fiber probe is inserted into the simulation box from the top of the simulation box and connected with the wall face of the simulation box in a sealed mode; the linear moving mechanism is used for pushing the objective table to linearly move along the horizontal plane; the stepless speed regulation air pump is used for driving air in the simulation box to circularly flow; the temperature control mechanism is used for controlling the temperature in the simulation box. The device can simulate various underground environment factors, and can be used for analyzing the influence of the underground environment on the near infrared spectrum data of the coal rock sample, so that the near infrared spectrum data of the coal rock sample is corrected, and the coal rock interface can be identified more accurately.

Description

Technical Field

[0001] The invention relates to the technical field of underground environment simulation experiments, in particular to a simulated drilling environment, and specifically to an experimental device for simulating the influence of underground environment on near-infrared spectrum of coal and rock. Background Art

[0002] Drilling technology is an effective technical means for efficient underground gas control in coal mines, advance drainage of roof, and grouting reinforcement of bottom waterproof layer. It is also a mandatory disaster control measure taken by the State Mine Safety Supervision Bureau before large-scale mining of high-gas and coal and gas outburst mines. It plays an irreplaceable role in coal mine gas extraction, water hazard prevention and control, and detection of hidden disaster-causing geological factors. It is of great significance to ensure safe production in coal mines, increase the supply of clean energy, and reduce greenhouse gas emissions.

[0003] In order to ensure the effect of gas extraction, reduce extraction blind areas, and clarify the scope of mining, real-time detection and in-situ identification of lithology data of coal seams and top and bottom rock strata are important tasks in the drilling process. The identification results of the interface between coal seams and rock strata are direct evaluation indicators for the quality acceptance of drilling projects (Coal Geology Drilling Regulations (MT / T 1076-2008)). In addition, the spatial distribution data of coal seams and rock strata based on borehole identification is the basic key data of the geological support system of the underground transparent working face of coal mines. The efficient and accurate detection of coal-rock lithology and interface during the drilling process can effectively support the three-dimensional fine geological modeling work of integrating geological, seismic, and mining data in the later stage. Therefore, the identification of the coal-rock interface during drilling is one of the key technologies for building high-precision geological models and an important research direction for the future less-manned and intelligent mining of coal mines.

[0004] The Chinese patent with publication number CN118585810A discloses a real-time online accurate identification method of coal and rock based on spectral technology, which uses the near-infrared spectrum data of coal and rock samples under light source irradiation to train the identification model, and then obtains the near-infrared spectrum data of the coal and rock to be identified and uses the identification model to identify the coal-rock interface in real time. However, the underground environment is complex, and many factors in the borehole will affect the infrared spectrum, such as the temperature and dust concentration in the borehole. Therefore, it is necessary to determine the impact of various factors on the near-infrared spectrum in order to correct the spectral data. Summary of the invention

[0005] In order to solve at least one of the above problems, the purpose of the present invention is to provide an experimental device for simulating the influence of underground environment on near-infrared spectrum of coal and rock, which is used to analyze the influence of drilling environment on near-infrared spectrum data of coal and rock samples.

[0006] In order to achieve the above object, the technical solution provided by the present invention is as follows: An experimental device for simulating the influence of underground environment on near infrared spectrum of coal and rock, comprising: A simulation box with a closed structure; A stage located in the simulation box for carrying coal and rock samples; Near infrared spectrometer; A fiber optic probe having one end connected to the near-infrared spectrometer and the other end inserted into the simulation box from the top and sealed to the wall of the simulation box. The fiber optic probe includes an incident fiber and an output fiber, and is used to obtain near-infrared spectrum data of coal and rock samples. The fiber optic probe can move along its axial direction. A distance meter fixed to one end of the optical fiber probe facing the coal and rock sample and facing the top surface of the coal and rock sample; A linear motion mechanism for driving the stage to move linearly along a horizontal plane; A stepless speed regulating air pump for driving the circulation of gas in the simulation box; A dust collector for removing dust from the circulating gas leaving the simulation chamber; A dust feeding mechanism for adding dust to the circulating gas entering the simulation chamber; A temperature control mechanism for controlling the temperature inside the simulation chamber.

[0007] As a specific embodiment of the present invention, the temperature control mechanism includes an oil bath and a heater, wherein the oil bath stores heat transfer oil, the heater adopts closed-loop control to stably control the temperature of the heat transfer oil, and the simulation box is immersed in the oil bath.

[0008] As a specific embodiment of the present invention, the stage is suspended in the simulation box, and the linear moving mechanism includes: A screw rod is rotatably fixed in the simulation box, and a middle portion of the screw rod is threadedly connected to the stage; A guide rod is fixed in the simulation box and is parallel to the screw rod, and the guide rod passes through the stage and is in clearance fit with the stage; A high temperature resistant motor with the output shaft coaxially connected to the screw.

[0009] As a specific embodiment of the present invention, an air distribution plate is provided at the gas inlet end of the simulation box, and the air distribution plate is arranged vertically and separated from the gas inlet of the simulation box, thereby forming a gas distribution cavity between the inner wall of the simulation box and the air distribution plate, and a plurality of Z-shaped flow channels are arranged in an array on the air distribution plate; the gas inlet of the gas distribution cavity is located at the bottom of the gas distribution cavity.

[0010] Furthermore, a dust collection chamber is provided at the bottom of the simulation box, dust through holes are arranged in an array on the bottom plate of the simulation box outside the gas distribution cavity, and the simulation box is connected with the dust collection chamber through the dust through holes.

[0011] Furthermore, the dust through hole is an inverted tapered hole.

[0012] As a specific embodiment of the present invention, the stage comprises a base plate, a carrier plate and a rotating shaft, wherein the base plate is connected to the linear moving mechanism, wherein a lug extending in a normal direction is provided on the base plate, and the rotating shaft is fixedly connected to the carrier plate and rotatably connected to the lug; The experimental device also includes an angle adjustment mechanism, which includes: A ratchet wheel fixedly connected to the rotating shaft, which is a disc structure with a unidirectional tooth groove on the outer edge; One end is rotatably connected to the support ear, and the other end abuts against the first pawl of the tooth groove on the outer edge of the ratchet wheel; A first swing rod having one end rotatably connected to the rotating shaft; One end of the second pawl is rotatably connected to the first swing rod, and the other end of the second pawl abuts against the tooth groove on the outer edge of the ratchet wheel; a second swing rod having one end rotatably connected to the base plate, wherein a free end of the second swing rod and a free end of the first swing rod are respectively fixed to two ends of the rope, and a rotation plane of the second swing rod and a rotation plane of the first swing rod are perpendicular to each other; A blocking rod horizontally fixed in the simulation box, the blocking rod extending in the direction of horizontal movement of the stage, the center line of the blocking rod being located on the rotation plane of the second swing rod; Among them, the first pawl and the second pawl prevent the ratchet wheel from rotating in the opposite direction. When the second rocker arm is separated from the blocking rod, the first rocker arm rotates in the opposite direction to the extreme position under the action of the return spring and drives the free end of the second rocker arm to rotate in the opposite direction to a position higher than the blocking rod. The loading platform moves toward the blocking rod until the side wall of the second rocker arm abuts against the blocking rod and then continues to move in the same direction. Then the blocking rod pushes the second rocker arm to rotate in the positive direction until the free end of the second rocker arm abuts against the annular outer wall of the blocking rod.

[0013] The beneficial effects of the present invention are as follows: The experimental device for simulating the influence of the underground environment on the near-infrared spectrum of coal rock of the present invention can simulate the underground environment and obtain the near-infrared spectrum data of the coal rock samples under this environment, and is used to analyze the influence of the underground environment on the near-infrared spectrum of the coal rock samples, thereby correcting the near-infrared spectrum data of the coal rock samples, so as to facilitate more accurate identification of the coal-rock interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the linear motion mechanism; Figure 3 It is a schematic diagram of the overall structure of another embodiment of the present invention.

[0015] Figure 4 for Figure 3 Schematic diagram of the simulation box; Figure 5 yes Figure 3 Schematic diagram of the mid-angle adjustment mechanism; Figure 6 yes Figure 3 Schematic diagram of the combined structure of the middle swing rod and the ratchet wheel; Figure 7 for Figure 6 Schematic diagram of the combined structure of the middle swing rod and the pawl; In the figure, simulation box 100; stage 200; near infrared spectrometer 300; optical fiber probe 310; linear motion mechanism 400; stepless speed regulating air pump 500; dust collector 610; Base plate 210; support ear 211; loading plate 220; rotating shaft 230; High temperature resistant motor 410; screw rod 420; guide rod 430; Dust feeding mechanism 620; oil bath 710; heater 720; Air distribution plate 810; gas distribution chamber 820; dust collection chamber 830; dust through hole 840; Ratchet 910 ; first pawl 921 ; first swing rod 930 ; second swing rod 940 ; second pawl 922 ; blocking rod 950 ; rope 960 . DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0017] Please refer to Figure 1 to Figure 7 , which shows the structures of two specific implementations of the experimental device for simulating the influence of underground environment on the near-infrared spectrum of coal rock of the present invention. The experimental device of the present invention is used to simulate the underground environment of coal rock and obtain the near-infrared spectrum data of the coal rock sample under the environment, so as to facilitate the correction of the underground near-infrared spectrum data. The experimental device of the present invention includes a simulation box 100, a stage 200, a near-infrared spectrometer 300, a fiber optic probe 310, a rangefinder, a linear moving mechanism 400, a stepless speed regulating air pump 500, a dust collector 610, a dust feeding mechanism 620 and a temperature control mechanism, which can simulate a variety of underground environmental factors, such as the distance between the fiber optic probe 310 and the coal rock sample, the gas flow rate, the dust concentration in the gas, the relative movement speed of the fiber optic probe 310 and the coal rock sample, and the temperature.

[0018] The simulation box 100 of the present invention is a closed structure, and the stage 200 is located in the simulation box 100 and is used to carry the coal rock sample; one end of the optical fiber probe 310 is connected to the near-infrared spectrometer 300, and the other end is inserted into the simulation box 100 from the top and is sealed and connected to the wall of the simulation box 100. The optical fiber probe 310 includes an incident optical fiber and an output optical fiber, which are used to obtain near-infrared spectrum data of the coal rock sample; the optical fiber probe 310 can move along its axial direction, so that the distance between the coal rock sample and the optical fiber probe 310 can be adjusted. The rangefinder is fixed to one end of the optical fiber probe 310 facing the coal rock sample and facing the top surface of the coal rock sample, and is used to measure the distance between the optical fiber probe 310 and the coal rock sample. distance; the linear moving mechanism 400 is used to push the stage 200 to move in a straight line along the horizontal plane, so as to change the relative speed between the optical fiber probe 310 and the coal rock sample; the stepless speed regulating air pump 500 is used to drive the circulation of gas in the simulation box 100, so as to adjust the gas flow rate between the coal rock sample and the optical fiber probe 310; the dust collector 610 is used to remove dust from the circulating gas leaving the simulation box 100, and the dust feeding mechanism 620 is used to add dust to the circulating gas entering the simulation box 100, so as to adjust the dust concentration in the gas between the coal rock sample and the optical fiber probe 310; the temperature control mechanism is used to control the temperature in the simulation box 100, so as to simulate different underground temperatures.

[0019] The temperature control mechanism of the present invention is used to control the temperature in the simulation box 100. The specific control means and equipment can be reasonably selected according to factors such as the scale of the experimental device. For example, a constant temperature box can be selected when the experimental device is small. For example, in some embodiments, in order to reduce temperature fluctuations, an oil bath temperature control is selected, such as Figure 1 As shown, the temperature control mechanism includes an oil bath 710 and a heater 720, wherein the oil bath 710 stores thermal oil, and the heater 720 adopts closed-loop control to stably control the temperature of the thermal oil. The simulation box 100 is immersed in the oil bath 710, so that the temperature of the simulation box 100 can be controlled by the thermal oil. Of course, if the oil bath 710 is large in volume, a circulation pump can be added to circulate the thermal oil in the oil bath 710, so that the temperature in the entire oil bath 710 is more uniform.

[0020] The linear motion mechanism 400 of the present invention is used to push the stage 200 to move in the simulation box 100. Conventional telescopic mechanisms can achieve this function. It should be noted that during the simulation experiment, dust in the gas may settle at the bottom of the simulation box 100, causing problems such as jamming, thereby preventing the stage 200 from sliding along the bottom of the simulation box 100. Therefore, in some embodiments, the stage 200 is suspended in the simulation box 100, that is, the bottom of the stage 200 is separated from the bottom of the simulation box 100, that is, there is a certain distance between the two, such as Figure 1 and Figure 3As shown, at this time, the linear motion mechanism 400 needs to provide horizontal thrust and vertical support force to the stage 200, and also needs to prevent the stage 200 from rotating, such as Figure 2 As shown, the linear moving mechanism 400 includes a high temperature resistant motor 410, a screw 420 and a guide rod 430. Both ends of the screw are rotatably fixed in the simulation box 100, and the middle part of the screw 420 is threadedly connected to the worktable 200. The output shaft of the high temperature resistant motor 410 is coaxially connected to the screw 420, thereby driving the screw 420 to rotate synchronously. The guide rod 430 is fixed in the simulation box 100 and is parallel to the screw 420. At the same time, the guide rod 430 passes through the worktable 200 and cooperates with it in a clearance, thereby preventing the worktable 200 from rotating.

[0021] The present invention uses a method of first removing dust and then adding dust to accurately control the dust content in the inlet gas of the simulation box 100, wherein the dust collector 610 can be a bag dust collector, and the dust feeding mechanism 620 can be a screw feeder conveyor and other mature equipment.

[0022] In the present invention, after the gas enters the simulation box 100, its velocity will decrease due to the increase in the flow cross-sectional area, which is easy to produce a dead zone (stagnation zone) in the simulation box 100, making it difficult to accurately measure the actual gas flow rate between the optical fiber probe 310 and the coal rock sample through the circulating gas flow. Therefore, in some embodiments, such as Figure 3 and Figure 4 As shown, an air distribution plate 810 is provided at the gas inlet end of the simulation box 100. The air distribution plate 810 is arranged vertically and separated from the gas inlet of the simulation box 100, that is, a certain distance is spaced between the two, so that a gas distribution chamber 820 is formed between the inner wall of the simulation box 100 and the air distribution plate 810. A plurality of Z-shaped flow channels are arranged in an array on the air distribution plate 810 to increase the gas flow resistance, thereby facilitating the uniform distribution of the gas in these flow channels, thereby reducing the dead zone volume in the simulation box 100. At the same time, the presence of the air distribution plate 810 increases the pressure of the gas when it enters the simulation box 100, and also reduces the flow rate of the gas there, which increases the deposition tendency of dust in the gas and interferes with the measurement of dust concentration. Therefore, in order to reduce the deposition amount of dust, the gas inlet of the gas distribution chamber 820 is located at the bottom of the gas distribution chamber 820, that is, the gas outlet of the stepless speed regulating air pump 500 is connected to the bottom of the gas distribution chamber 820, so that the gas flows from bottom to top after entering the gas distribution chamber 820, hindering the deposition of dust.

[0023] In addition, dust will be deposited and stacked in the simulation box 100, and will be disturbed by the airflow at the bottom of the air distribution plate 810. The thickness of the dust near the air distribution plate 810 is lower, while the thickness of the dust far away from the air distribution plate 810 is higher. As the dust continues to accumulate, the difference in dust thickness at each location will gradually increase and eventually form a landslide, that is, the dust at a high thickness location will slide to a low dust thickness location, which will move the dust far away from the air distribution plate 810 to a position closer to the air distribution plate 810, so that part of the dust is disturbed by the strong airflow of the air distribution plate 810 and re-enters the gas phase of the simulation box 100. Moreover, the greater the amount of dust that slides and the longer the horizontal distance of the dust during the slide, the greater the amount of dust that re-enters the gas phase of the simulation box 100, and this amount is difficult to measure, which greatly interferes with the measurement of dust concentration in the gas. Therefore, in some embodiments, a dust collection chamber 830 is provided at the bottom of the simulation box 100, and dust through holes 840 are arranged in an array at a position outside the gas distribution chamber 820 on the bottom plate of the simulation box 100. The dust deposited in the simulation box 100 can enter the dust collection chamber 830 through the through holes 840. In this way, the maximum height of the dust stack is also reduced, and the horizontal movement distance of the dust during collapse is also reduced, thereby reducing the amount of deposited dust that re-enters the gas of the simulation box 100 and reducing the impact on the dust concentration in the simulation box 100. In addition, the dust through holes 840 can adopt inverted cone holes, thereby reducing the plane area of ​​the bottom of the simulation box 100, which is more conducive to the rapid entry of dust into the simulation box 100.

[0024] In some embodiments, the top surface of the coal rock sample can be prefabricated into a curved surface or inclined surface at different angles, so as to explore the influence of different incident light angles on the near-infrared spectrum. The top surface of the coal rock sample can also be set as a plane, and different incident angles can be formed by adjusting the angle between the coal rock sample and the stage 200. However, the coal rock sample is located in the simulation box 100, and the existing method of adjusting the angle is often manual adjustment, which requires opening the simulation box 100, which makes the operation cumbersome and time-consuming. In this regard, the present invention proposes a new structure, which improves the stage 200 and cooperates with the angle adjustment mechanism to adjust the inclination angle of the coal rock sample on the stage 200. It can adjust the inclination angle of the stage 200 through the linear moving mechanism 400 in a confined space, thereby eliminating the step of opening the simulation box 100.

[0025] For more information, see Figure 3 to Figure 7 The stage 200 includes a base plate 210, a carrier plate 220 and a rotating shaft 230. The carrier plate 220 is used to carry coal and rock samples. The base plate 210 is connected to the linear moving mechanism 400, wherein the base plate 210 is provided with a support ear 211 extending along the normal direction. The rotating shaft 230 is fixedly connected to the carrier plate 220 and rotatably connected to the support ear 211, so that the carrier plate 220 is hinged to the base plate 210.

[0026] The angle adjustment mechanism includes a ratchet 910, a first ratchet 921, a first swing rod 930, a second swing rod 940, a second ratchet 922 and a blocking rod 950, wherein the ratchet 910 is fixedly connected to the rotating shaft 230, so that the ratchet 910, the rotating shaft 230 and the carrier plate 220 rotate synchronously, and the angle between the base plate 210 and the carrier plate 220 can be adjusted by rotating the ratchet 910; the ratchet 910 is a disc structure with a unidirectional tooth groove on the outer edge; one end of the first ratchet 921 is rotatably connected to the support ear 211, and at the same time, the first ratchet 921 is equipped with an elastic element to push its free end to abut against the ratchet 91 0 and mesh with the tooth groove of the ratchet 910, thereby preventing the ratchet 910 from reversing and playing a check function; one end of the first swing rod 930 is rotatably connected to the rotating shaft 230, and one end of the second pawl 922 is rotatably connected to the first swing rod 930. At the same time, the second pawl 922 is equipped with an elastic element to push its free end to abut against the outer edge of the ratchet 910 and mesh with the tooth groove of the ratchet 910 to prevent the ratchet 910 from reversing. Therefore, the reciprocating rotation of the first swing rod 930 can drive the ratchet 910 to rotate in one direction; one end of the second swing rod 940 is rotatably connected to the base plate 210, and the free end of the second swing rod 940, the first swing The free ends of the rod 930 are respectively fixed to the two ends of a rope 960 with a certain length, so that the two are linked, and the rotation surface of the second swing rod 940 is perpendicular to the rotation surface of the first swing rod 930. The blocking rod 950 is horizontally fixed in the simulation box 100 and extends along the moving direction of the object carrier 200. At the same time, the center line of the blocking rod 950 is located on the rotation surface of the second swing rod 940; when the second swing rod 940 is separated from the blocking rod 950, the first swing rod 930 rotates in the opposite direction to the extreme position under the action of the return spring and drives the free end of the second swing rod 940 to rotate in the opposite direction to a position higher than the blocking rod 950; When the stage 200 moves toward the blocking rod until the side wall of the second swing rod 940 abuts against the blocking rod 950, it continues to move in the same direction. Then, the blocking rod 950 pushes the second swing rod 940 to rotate forward, and the second swing rod 940 drives the second swing rod 940 to rotate forward through the rope 960, thereby driving the ratchet 910 to rotate until the free end of the second swing rod 940 abuts against the annular outer wall of the blocking rod 950. Similarly, when the stage 200 moves in the opposite direction (i.e., in the direction away from the blocking rod 950), the second swing rod 940 is finally separated from the blocking rod 950, and the first swing rod 930 is reset under the action of the reset spring. Therefore, the inclination angle of the top surface of the coal rock sample can be adjusted by driving the second swing rod 940 to move and touch the blocking rod 950 through the linear moving mechanism 400, and the angle adjusted each time by touching is equal.

[0027] In specific use, the linear moving mechanism 400 can be used to drive the stage 200 to move back and forth, but the second swing rod 940 does not touch the blocking rod 950 to simulate the underground environment with speed as a single variable, and the linear moving mechanism 400 can be used to drive the stage 200 to move back and forth, and the second swing rod 940 touches the blocking rod 950 to simulate the underground environment with the incident angle as a single variable. The present invention realizes the automatic adjustment of the angle of the coal and rock samples in a closed environment by linking the linear moving mechanism with the ratchet mechanism, solving the problem of low efficiency of traditional manual operation.

[0028] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. An experimental device for simulating the influence of underground environment on the near-infrared spectrum of coal and rock, characterized in that: include: A simulation box with a closed structure; A loading platform located in the simulation box and used for carrying coal and rock samples; Near infrared spectrometer; An optical fiber probe having one end connected to the near-infrared spectrometer and the other end inserted into the simulation box from the top of the simulation box and sealedly connected to the wall of the simulation box, wherein the optical fiber probe comprises an incident optical fiber and an output optical fiber, and is used to obtain near-infrared spectrum data of coal and rock samples; the optical fiber probe can move along its axial direction; A distance meter fixed to one end of the optical fiber probe facing the coal and rock sample and facing the top surface of the coal and rock sample; A linear movement mechanism for driving the stage to move linearly along a horizontal plane; A stepless speed regulating air pump for driving the circulation of gas in the simulation box; a dust collector for removing dust from the circulating gas leaving the simulation box; a dust feeding mechanism for adding dust to the circulating gas entering the simulation box; A temperature control mechanism is used to control the temperature inside the simulation box.

2. The experimental device for simulating the influence of underground environment on the near-infrared spectrum of coal and rock according to claim 1, characterized in that: The temperature control mechanism comprises an oil bath and a heater, wherein the oil bath stores heat transfer oil, the heater adopts closed-loop control to stably control the temperature of the heat transfer oil, and the simulation box is immersed in the oil bath.

3. The experimental device for simulating the influence of underground environment on the near-infrared spectrum of coal and rock according to claim 1, characterized in that: The stage is suspended in the simulation box, and the linear motion mechanism comprises: A screw rod rotatably fixed in the simulation box, wherein the middle portion of the screw rod is threadedly connected to the stage; A guide rod fixed in the simulation box and parallel to the screw rod, the guide rod passing through the stage and having a clearance fit with the stage; The output shaft is coaxially connected to the screw rod and is resistant to high temperature.

4. The experimental device for simulating the influence of underground environment on the near-infrared spectrum of coal and rock according to claim 1, characterized in that: An air distribution plate is provided at the gas inlet end of the simulation box, and the air distribution plate is arranged vertically and separated from the gas inlet of the simulation box, so as to form a gas distribution cavity between the inner wall of the simulation box and the air distribution plate, and a plurality of Z-shaped flow channels are arranged in an array on the air distribution plate; the gas inlet of the gas distribution cavity is located at the bottom thereof.

5. The experimental device for simulating the influence of underground environment on the near-infrared spectrum of coal and rock according to claim 4, characterized in that: A dust collection chamber is provided at the bottom of the simulation box, dust through holes are arranged in an array on the bottom plate of the simulation box at a position outside the gas distribution chamber, and the simulation box is connected with the dust collection chamber through the dust through holes.

6. The experimental device for simulating the influence of underground environment on the near-infrared spectrum of coal and rock according to claim 5, characterized in that: The dust through hole is an inverted cone-shaped hole.

7. The experimental device for simulating the influence of underground environment on the near-infrared spectrum of coal and rock according to claim 1, characterized in that: The stage comprises a base plate, a carrier plate and a rotating shaft, wherein the base plate is connected to the linear moving mechanism, wherein a lug extending in a normal direction is provided on the base plate, and the rotating shaft is fixedly connected to the carrier plate and rotatably connected to the lug; The experimental device also includes an angle adjustment mechanism, which includes: A ratchet wheel fixedly connected to the rotating shaft, which is a disc structure with a unidirectional tooth groove on the outer edge; One end is rotatably connected to the support ear, and the other end abuts against a first pawl of a tooth groove on the outer edge of the ratchet wheel; A first swing rod having one end rotatably connected to the rotating shaft; One end of the second pawl is rotatably connected to the first swing rod, and the other end of the second pawl abuts against the tooth groove on the outer edge of the ratchet wheel; a second swing rod having one end rotatably connected to the base plate, wherein a free end of the second swing rod and a free end of the first swing rod are respectively fixed to two ends of the rope, and a rotation plane of the second swing rod and a rotation plane of the first swing rod are perpendicular to each other; A blocking rod horizontally fixed in the simulation box, the blocking rod extending in the direction of horizontal movement of the stage, the center line of the blocking rod being located on the rotation plane of the second swing rod; Among them, the first pawl and the second pawl prevent the ratchet wheel from rotating in the opposite direction. When the second rocker arm is separated from the blocking rod, the first rocker arm rotates in the opposite direction to the extreme position under the action of the return spring and drives the free end of the second rocker arm to rotate in the opposite direction to a position higher than the blocking rod. The loading platform moves toward the blocking rod until the side wall of the second rocker arm abuts against the blocking rod and then continues to move in the same direction. Then the blocking rod pushes the second rocker arm to rotate in the positive direction until the free end of the second rocker arm abuts against the annular outer wall of the blocking rod.

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