A device for detecting ash content of constant-thickness in-situ coal using low-energy gamma rays

Abstract

The present invention relates to the technical field of coal ash detection, and specifically to a device for detecting the coal ash content of constant-thickness in-situ coal using low-energy gamma rays. The device comprises a sampling assembly for collecting coal samples, wherein the sampling assembly includes a shaping piece for controlling the thickness of a coal mass composed of the coal sample; a detection assembly capable of emitting gamma rays is arranged on the shaping piece; the gamma rays emitted by the detection assembly pass through the coal mass along the thickness direction of the coal mass and are received and processed by a gamma-ray detector; the present invention can form a coal seam of constant thickness, thereby improving the accuracy of coal ash detection.

Description

Technical Field

[0001] The invention relates to the technical field of coal ash detection, in particular to a device for detecting the ash content of constant-thickness in-situ coal using low-energy gamma rays. Background Art

[0002] At present, the measurement method of coal ash content generally adopts the burning test method, gamma ray detection method and other methods. The execution process of the burning test method is sampling - sample preparation - ash burning. First, the coal sample is collected manually on the conveyor belt, and then sent to the coal quality department for sample preparation and ash burning. Although this method can improve the accuracy of the detection, manual sampling and sample preparation are affected by factors such as sampling tools and human factors, and the representativeness of the coal sample is low. In order to avoid this influence, patent CN212364137U discloses an integrated coal ash content detection device, including a coal slag sampling device for collecting coal slag on the conveyor belt, the sampling device transmits the collected sample coal slag to the sample preparation device; the sample preparation device is used to receive the sample coal slag, crush the sample coal slag to obtain coal slag powder, and transmit the coal slag powder to the detection device; the detection device is used to receive the coal slag powder, and detect the coal slag powder to obtain the ash content value of the coal slag. ". The equipment can complete the entire operation from sampling to sample preparation and then testing, greatly improving the detection efficiency, reducing the impact of human factors and other factors on the accuracy of coal ash detection, and overall improving the coal ash detection effect.

[0003] However, long-term use of this existing technology has revealed that, while it can mitigate the effects of human factors, the varying sizes of coal particles result in uneven coal seam thicknesses, which in turn lead to varying degrees of radiation attenuation. Thicker coal seams are impenetrable to radiation, while thinner ones make it impossible to detect radiation attenuation. This results in significant deviations in coal ash content or even makes detection impossible. This severely impacts detection accuracy and performance, and therefore urgently requires a solution. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, the present invention provides a device for detecting the ash content of constant-thickness in-situ coal using low-energy gamma rays. The present invention can form a uniformly thick coal seam, thereby improving the accuracy of coal ash detection.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device for detecting the ash content of constant-thickness in-situ coal using low-energy gamma rays comprises a sampling assembly for collecting coal samples, the sampling assembly including a shaping piece for controlling the thickness of a coal lump comprising the coal sample; a detection assembly capable of emitting gamma rays is arranged on the shaping piece; the gamma rays emitted by the detection assembly pass through the coal lump along the thickness direction of the coal lump and are received and processed by a gamma-ray detector.

[0007] As a further solution of the present invention: the sampling assembly includes a sampling rail installed on the base and extending to the coal sample outlet, and a sampling box for containing coal samples is slidably arranged on the sampling rail, and the sampling box is the shaped part.

[0008] As a further solution of the present invention: a sampling screw is fixedly connected to the sampling box, and the axial direction of the sampling screw is parallel to the length direction of the sampling guide rail; a sampling motor is installed at a position of the base away from the coal sample outlet and is transmission-connected to the sampling screw.

[0009] As a further solution of the present invention: a protective side panel is installed in the sampling box, and the protective side panel is a U-shaped panel structure, and the protective side panel can be inserted into the sampling box with the top opening from top to bottom in the vertical direction; the two side walls of the sampling box constitute measurement side panels for the passage of gamma rays, and the plate surface of the protective side panel abuts against the inner plate surface of the corresponding measurement side panel from the inside to the outside.

[0010] As a further solution of the present invention: anti-fall plates extending outward are symmetrically arranged on the outer plate surface of the protective side plate; each anti-fall plate is located above the measuring side plate on the corresponding side, and along the vertical direction, the projection of each measuring side plate is located within the projection range of the corresponding anti-fall plate.

[0011] As a further solution of the present invention: the device also includes a lifting assembly, which includes a lifting screw installed on a bracket, and the axial direction of the lifting screw is arranged vertically; a lifting motor is arranged on the bracket and is in transmission cooperation with the lifting screw; a second support hook is fixedly connected to the bottom of the lifting screw, and a first support hook that can be hooked with the second support hook is arranged on the top of the protective side plate.

[0012] As a further solution of the present invention: the device also includes a shipping assembly, which includes a shipping base plate constituting the base, and the shipping base plate is slidably arranged on a shipping guide rail; the shipping guide rail is installed on the top surface, and the shipping guide rail and the sampling guide rail are arranged parallel to each other.

[0013] As a further solution of the present invention: a consignment screw is fixedly connected to the consignment base plate, and the axial direction of the consignment screw is parallel to the length direction of the consignment guide rail; a consignment motor is arranged on the ground and cooperates with the consignment screw for transmission.

[0014] As a further solution of the present invention: the detection component includes a lead radioactive source and an americium radioactive source. The gamma rays emitted by the lead radioactive source or the americium radioactive source pass through the two measuring side plates vertically in sequence and are received by the gamma ray detector, which is also connected to the ash analyzer host.

[0015] As a further solution of the present invention: a feeding chute is arranged at the bottom of the coal sample outlet, the length direction of the feeding chute is parallel to the length direction of the consignment guide rail, and the consignment guide rail extends into the feeding chute.

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

[0017] 1. The present invention uses a shaped piece to ensure that the thickness of the coal mass formed by the collected coal samples is constant. This appropriate thickness can keep the radiation attenuation within a reasonable range, thereby facilitating detection by the radiation detector and improving the accuracy of coal ash detection.

[0018] 2. The present invention uses a sampling box that can move along the sampling guide rail, which can transport the randomly collected coal samples away from the coal sample outlet, thereby providing a clean detection environment for the detection component and preventing the coal powder floating in the air from affecting the detection instrument.

[0019] 3. A protective side panel is positioned close to the inside of the measuring side panel, and an anti-drop plate extends outward from the protective side panel. The anti-drop plate shields the measuring side panel to prevent the falling coal sample from damaging the measuring side panel. The protective side panel is a U-shaped plate that can be inserted into the sampling box from top to bottom. It does not close the sampling box opening, leaving sufficient clearance for coal to enter the sampling box. The protective side panel and anti-drop plate are made of steel to prevent impact damage caused by falling coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the sampling component in the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the sampling assembly in the unloading state of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the consignment component in the present invention.

[0023] Figure 4 It is a schematic diagram of the coordination structure of the sampling component and the shipping component in the present invention.

[0024] Figure 5 It is a structural schematic diagram of the coal sample collection state in the present invention.

[0025] Figure 6 It is a structural schematic diagram of the sampling box in the present invention.

[0026] Figure 7 It is a schematic diagram of the matching structure of the protective side panel and the lifting assembly in the present invention.

[0027] Figure 8 This is a schematic structural diagram of the protective side panels and sampling box in the present invention.

[0028] Figure 9 It is a schematic diagram of the coordination structure of the lifting assembly and the sampling box in the present invention.

[0029] Figure 10 It is a structural schematic diagram of the protective side panels in the present invention in a raised position.

[0030] Figure 11 It is a structural schematic diagram of the protective side panels in the present invention in the lowered state.

[0031] In the figure: 10, detection component; 11, lead radiation source; 12, americium radiation source; 13, gamma ray; 14, gamma ray detector; 15, ash analyzer main unit;

[0032] 20. Sampling assembly; 21. Sampling box; 22. Sampling guide rail; 23. First measuring sensor; 24. Second measuring sensor; 25. Sampling motor; 26. Sampling screw; 27. Measuring side plate; 28. Protective side plate; 281. Anti-drop plate; 29. ​​First support hook;

[0033] 30. Lifting assembly; 31. Second support hook; 32. Lifting screw; 33. Lifting motor; 34. First lifting sensor; 35. Second lifting sensor;

[0034] 40. Shipping assembly; 41. Shipping base plate; 42. Shipping guide rail; 43. Shipping screw rod; 44. Shipping motor; 45. First shipping sensor; 46. Second shipping sensor;

[0035] 50. Feed chute. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figures 1-11 As shown, the device mainly includes a detection component 10, a sampling component 20, a lifting component 30 and a shipping component 40.

[0038] The transport assembly 40 primarily comprises a second transport sensor 46, a transport screw 43, a transport motor 44, a transport guide rail 42, a transport base plate 41, and a first transport sensor 45. The transport guide rail 42 is mounted on the ground and utilizes a common steel rail structure used for coal transportation. The transport guide rail 42 extends to the lower chute 50, facilitating the transport of coal samples. The transport base plate 41 is mounted on the transport guide rail 42, and a transport roller is disposed at the bottom of the transport base plate 41, which is in rolling connection with the transport guide rail 42, allowing the transport base plate 41 to move along the transport guide rail 42 to the lower coal chute.

[0039] A consignment screw 43 is fixed to one side of the consignment guide rail 42, and the consignment screw 43 cooperates with the consignment motor 44 installed at one end of the consignment guide rail 42 to form a screw drive mechanism. When the consignment motor 44 drives the consignment screw 43 to rotate, the consignment base plate 41 moves to the right along the consignment guide rail 42 until the first consignment sensor 45 detects the top of the consignment screw 43, and the consignment motor 44 stops driving. The consignment base plate 41 is now away from the lower media trough, which is defined as the open state of the consignment base plate 41. When the consignment motor 44 reverses and drives the consignment screw 43 to rotate, the consignment base plate 41 moves to the left along the consignment guide rail 42 until the second consignment sensor 46 detects the top of the consignment screw 43, and the consignment motor 44 stops reverse driving. The consignment base plate 41 is now close to the lower media trough, which is defined as the closed state of the consignment base plate 41.

[0040] like Figure 1-Figure 3 As shown, the sampling assembly 20 is mainly composed of a sampling box 21, a sampling guide rail 22, a first sampling sensor 23, a second sampling sensor 24, a sampling motor 25, a sampling screw rod 26 and a measuring side plate 27. A sampling screw rod 26 is fixedly connected to the middle of one side of the sampling box 21, and the sampling screw rod 26 and the end face of the sampling box 21 are arranged perpendicular to each other. The other end of the sampling screw rod 26 passes through a sampling screw sleeve that is transmission-connected to the sampling motor 25, thereby forming a screw drive mechanism in the prior art. The sampling motor 25 drives the sampling screw rod 26 to rotate, driving the sampling box 21 to move on the sampling guide rail 22. The sampling guide rail 22 is arranged on the shipping bottom plate 41, and also uses a steel rail structure; sampling rollers sliding on the sampling guide rail 22 are symmetrically arranged in pairs at the bottom of the sampling box 21. The sampling guide rail 22 and the shipping guide rollers are arranged parallel to each other.

[0041] A first sampling sensor 23 and a second sampling sensor 24 are provided on the right side of the sampling screw 26. When the sampling box 21 moves to the far left on the sampling guide rail 22 and the second sampling sensor 24 detects the top of the sampling screw 26, the sampling motor 25 stops, and the sampling box 21 remains stationary, indicating that the sampling box 21 is in the closed position. When the sampling box 21 moves to the far right on the sampling guide rail 22 and the first sampling sensor 23 detects the top of the sampling screw 26, the sampling motor 25 stops, and the sampling box 21 remains stationary, indicating that the sampling box 21 is in the open position. The first sampling sensor 23, the second sampling sensor 24, and the sampling motor 25 are all mounted on the shipping base plate 41.

[0042] The sampling component 20 is installed as a whole on the shipping base 41 in the shipping component 40. The sampling box 21 coincides with the rectangular square hole of the shipping base 41 when it is in the closed state. The sampling component 20 is fixed on the shipping base 41 horizontally in the center and to the left, and moves left and right with the shipping base 41.

[0043] like Figure 1 、 Figure 2 and Figure 6 As shown, the sampling box 21 is a rectangular box with an open top. The interior of the box forms an ash measurement chamber for loading coal samples. Sampling rails 22 are located on either side of the bottom of the ash measurement chamber, and the sampling box 21 can move back and forth on the sampling rails 22. A radioactive source consisting of an americium source 12 and a lead source 11 is located on one side of the sampling box 21. A gamma-ray detector 14 for receiving radiation is located on the opposite side of the sampling box 21, with the line connecting the radiation source and the detector perpendicular to the sampling rails 22. The americium source 12 is located in the middle of the lead source 11. Gamma rays 13 emitted by the americium source 12 pass through the collimating holes in the lead source 11, penetrate the ash measurement chamber, and are then received by the gamma-ray detector 14. The gamma-ray detector 14 receives the attenuated radiation energy and converts it into a pulse signal through a photoelectric conversion circuit, an amplification circuit, and other means. This signal is then transmitted to the ash analyzer main unit 15 for calculation, display, and storage.

[0044] like Figure 6 and Figure 8As shown, the two side panels of the sampling box 21 located between the radiation source and the detector are measuring side panels 27. The measuring side panels 27 are made of acrylic sheet material, whose density is generally between 1.15-1.19g / cm3, which is much lower than the density of ordinary glass. Due to its low density, the weight of the acrylic sheet is also relatively light, making it easy to carry and install. The acrylic sheet has a very high transparency and a smooth surface that is not easily scratched. It also has strong impact resistance and weather resistance, is not easily broken or deformed, and can be used under harsh conditions, so that the measuring side panels 27 can meet the requirements of gamma ray 13 ash measurement. At the same time, the attenuation of the gamma ray 13 when penetrating the measuring side panels 27 is very small, so that most of the gamma ray 13 is absorbed by the measured coal sample, improving the precision and accuracy of the ash measurement. A protective side panel 28 is positioned adjacent to the inner side of the measuring side panel 27. Extending outward from the protective side panel 28 is an anti-drop plate 281. This plate shields the measuring side panel 27, preventing any falling coal samples from damaging it. The protective side panel 28 is a U-shaped plate that slots into the sampling box 21 from top to bottom. It does not seal the opening of the sampling box 21, leaving ample clearance for coal to enter. Both the protective side panel 28 and the anti-drop plate 281 are constructed of steel to protect them from impact damage caused by falling coal.

[0045] like Figure 7-11 As shown, the lifting assembly 30 mainly consists of a second supporting hook 31, a lifting motor 33, a lifting screw 32, a first lifting sensor 34, and a second lifting sensor 35. When the sampling box 21 moves to the bottom of the lifting assembly 30, the first supporting hook 29 installed on the top of the protective side plate 28 and the second supporting hook 31 of the lifting assembly 30 are hooked and interlocked, as shown in FIG. Figure 9 As shown, the lifting motor 33 of the lifting assembly 30 is installed on the bracket, and the lifting motor 33 drives the lifting screw 32 to rotate. The lifting screw 32 arranged in the vertical direction drives the second hook 31 to move vertically upward, and the protective side plate 28 is driven to rise by the second hook 31. When the first lifting sensor 34 detects that the top of the lifting screw 32 has risen to the highest position, the lifting motor 33 stops driving and maintains the current state so that the first hook 29 of the ash measuring chamber remains in a suspended state, and it is defined as the raised position state, as shown in FIG. Figure 10As shown. At this time, the bottom end of the protective side plate 28 has been away from the path of the gamma ray 13 penetrating the sample, and the gamma ray 13 ash measurement can be performed; when the ash measurement chamber completes the ash measurement and is ready for the next coal sample sampling, the protective side plate 28 needs to be lowered. The lifting motor 33 of the lifting assembly 30 drives the lifting screw 32 to rotate in reverse, and drives the first hook 29 of the ash measurement chamber to descend along the protective side plate 28 of the ash measurement chamber through the second hook 31. When the second lifting sensor 35 detects that the top of the lifting screw 32 has dropped to the lowest position, the lifting motor 33 stops driving, and the protective side plate 28 returns to its original position, and it is defined as the lowered position state, as shown in FIG. Figure 11 shown.

[0046] The specific working process of the device is as follows:

[0047] First, empty the sampling box 21 and put the sampling box 21 into the closed position, the protective side panel 28 into the lowered position, the shipping bottom plate 41 into the open position, and the sampling assembly 20 is ready for sampling.

[0048] The second shipping motor 44 drives the shipping screw 43 to rotate in reverse, and the shipping base 41 ships the sampling assembly 20 to move to the left along the shipping guide rail 42 and enter the discharge chute 50 until the second shipping sensor 46 detects the top of the shipping screw 43, and the shipping motor 44 stops driving. The shipping base 41 moves to the closed position, as shown in FIG. Figure 5 As shown. The sampling assembly 20 starts to sample the coal falling from the chute 50, and the coal sample falls into the sampling box 21. After the sampling is completed, the consignment motor 44 drives the consignment screw 43 to rotate, and the consignment base plate 41 carries the sampled sampling assembly 20 to the right along the consignment guide rail 42 until the first consignment sensor 45 detects the top of the consignment screw 43, the consignment motor 44 stops driving, and the consignment base plate 41 moves to the open position, as shown. Figure 4 shown.

[0049] When the sampling assembly 20 after the sampling is carried by the three-carrying bottom plate 41 is moved to the open position, the first hook 29 is hooked with the second hook 31 of the lifting assembly 30 and interlocked with each other, and the lifting motor 33 of the lifting assembly 30 drives the lifting screw 32 to rotate, and drives the protective side plate 28 to rise along the protective side plate 28 through the second hook 31. When the first lifting sensor 34 detects that the top of the lifting screw 32 has risen to the highest position, the lifting motor 33 stops driving and maintains the current state so that the protective side plate 28 remains in a suspended state. Figure 9 shown.

[0050] The gamma rays 13 emitted by the tetramericium radioactive source 12 pass through the collimating hole of the lead radioactive source 11 and penetrate the ash measuring cavity and the measured coal sample. Most of the energy of the gamma rays 13 is absorbed by the measured coal sample in the ash measuring cavity, and the remaining gamma rays 13 are received by the gamma ray detector 14. The gamma ray detector 14 receives the attenuated energy and converts it into a pulse signal through a photoelectric conversion circuit, an amplifying circuit, etc., and transmits it to the ash meter host 15 for calculation, display and storage.

[0051] 5. After the ash content measurement is completed, the sampling motor 25 drives the sampling screw 26 to rotate, driving the sampling box 21 to move to the right on the sampling guide rail 22. When the sampling box 21 moves to the rightmost end on the sampling guide rail 22, the first sampling sensor 23 detects the open position signal, and the bottom of the sampling box 21 of the sampling assembly 20 opens. The coal sample to be measured in the ash content measurement cavity falls freely and falls back onto the belt conveyor through the rectangular square hole of the consignment bottom plate 41.

[0052] After the coal sample in the sixth ash content measurement cavity is completely emptied, the bottom of the sampling box 21 is completely closed, and the protective side panel 28 is completely lowered into place, that is, the protective side panel 28 is in the lowered position, and the shipping bottom panel 41 is in the opened position. The sampling assembly 20 is ready for re-sampling and the next sampling is carried out, and steps two to six are repeated.

[0053] In the ray transmission ash measurement method, when the ray penetrates a coal seam of a certain thickness, the ray and various substances in the coal produce photoelectric effect, Compton effect and electron pair effect. The ray attenuation intensity is mainly related to the inherent attenuation coefficient of each substance in the coal and the thickness of the coal seam, and shows an exponential attenuation law, as shown in the following formula:

[0054] N=N0e -μρd (1)

[0055] Where: N represents the number of pulses detected by the detector when there is a coal seam;

[0056] N0 represents the number of pulses detected by the detector when there is no coal seam, i.e. the pulse zero point;

[0057] μ represents the mass absorption coefficient of coal to γ-ray 13, cm 2 / g;

[0058] ρ represents the bulk density of coal, g / cm 3 ;

[0059] d is the thickness of the coal seam, cm;

[0060] ρd is called the mass thickness of the penetrating coal, cm 2 / g.

[0061] The intrinsic attenuation coefficient of a substance is related to the atomic number of the elements it contains. Different elements in coal have different atomic numbers, so their attenuation coefficients vary. Elements with low atomic numbers attenuate low-energy radiation very little, while elements with high atomic numbers attenuate low-energy radiation more. Therefore, low-energy americium can be used as a radiation source for gamma-ray 13 transmission ash measurement.

[0062] Coal is composed of combustibles and incombustibles, and the ash of coal is mainly incombustibles, which are all high atomic number elements. Assume that the mass percentage of high atomic number elements in coal is C Z , then the mass percentage of low atomic number elements in coal is 1-C Z , the mass attenuation coefficient of high atomic number elements is μ Z , the mass attenuation coefficient of low atomic number elements is μ C , so the mass attenuation coefficient of low-energy rays in coal is expressed by the following formula:

[0063] μ=μ Z ×C Z +μ C ×(1-C Z ) (2)

[0064] Substituting (2) into (1) and taking the logarithm of both sides, we can get C Z :

[0065]

[0066] Coal ash content A d It can be approximately equal to twice the mass percentage of high atomic number elements in the measured coal, that is,

[0067]

[0068] Build a linear model:

[0069] A d =mx+n 5)

[0070]

[0071]

[0072]

[0073] Formula (5) is a linear model, but x is a logarithmic function. When low-energy gamma rays are used to measure ash content when the thickness of the coal seam is equal, if the slope m and intercept n are calibrated well, the ash content is only related to the attenuation intensity of the rays passing through the coal, which greatly improves the stability and accuracy of the ash content measurement.

[0074] The coal sample to be measured in the ash content measuring chamber of the low-energy gamma ray 13 coal ash content detection device with constant thickness in-situ measurement is directly sampled from the coal washing production process without screening or crushing. The ash content of the coal sample is measured in-situ, which can more truly reflect the production process parameters, working conditions and clean coal quality. The height of the ash content measuring chamber in the low-energy gamma ray 13 coal ash content detection device with constant thickness in-situ measurement depends on the protective side plate 28. The height of the protective side plate 28 is fixed, that is, the thickness of the coal sample to be measured is consistent each time, thereby eliminating the influence of the thickness of the coal sample to be measured on the ash content measured by gamma ray 13, and ensuring the precision, stability and accuracy of the clean coal ash content measurement.

[0075] In summary, the low-energy gamma-ray 13 coal ash detection device with constant thickness in-situ measurement can achieve high-precision, high-stability, and high-accuracy online constant-thickness in-situ ash content measurement of the measured coal sample. The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and inventive concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A device for detecting the ash content of constant-thickness in-situ coal using low-energy gamma rays, characterized in that: The invention comprises a sampling assembly (20) for collecting coal samples, wherein the sampling assembly (20) comprises a shaping piece for controlling the thickness of a coal mass composed of the coal sample; a detection assembly (10) capable of emitting gamma rays (13) is arranged on the shaping piece; the gamma rays (13) emitted by the detection assembly (10) pass through the coal mass along the thickness direction of the coal mass and are received and processed by a gamma ray detector (14); the sampling assembly (20) comprises a sampling guide rail (22) mounted on a base and extending to a coal sample outlet, a sampling box (21) for containing the coal sample is slidably arranged on the sampling guide rail (22), and the sampling box (21) is the shaping piece; a protective side plate (28) is installed in the sampling box (21), the protective side plate (28) is a U-shaped plate structure, and the protective side plate (28) can be inserted into the sampling box (21) with a top opening from top to bottom in a vertical direction; the two side walls of the sampling box (21) constitute measurement side plates (28) for the gamma rays (13) to pass through. 7), the plate surface of the protective side plate (28) abuts against the inner plate surface of the corresponding measuring side plate (27) from the inside to the outside; the device also includes a lifting assembly (30), the lifting assembly (30) includes a lifting screw (32) installed on the bracket, and the axial direction of the lifting screw (32) is arranged vertically; the bracket is arranged with a lifting motor (33) that is in transmission cooperation with the lifting screw (32); the bottom of the lifting screw (32) is fixedly connected with a second hook (31), and the top of the protective side plate (28) is arranged with a first hook (29) that can be hooked with the second hook (31); the detection assembly (10) includes a lead radioactive source (11) and an americium radioactive source (12), and the gamma rays (13) emitted by the lead radioactive source (11) or the americium radioactive source (12) pass through the two measuring side plates (27) in sequence and are received by the gamma ray detector (14), and the gamma ray detector (14) is also connected to the ash analyzer host (15).

2. The device for detecting ash content of constant-thickness in-situ coal using low-energy gamma rays according to claim 1, characterized in that: A sampling screw rod (26) is fixedly connected to the sampling box (21), and the axial direction of the sampling screw rod (26) is parallel to the length direction of the sampling guide rail (22); a sampling motor (25) is installed at a position of the base away from the coal sample outlet and is transmission-connected to the sampling screw rod (26).

3. The device for detecting ash content of constant-thickness in-situ coal using low-energy gamma rays according to claim 2, characterized in that: Outwardly extending anti-fall plates (281) are symmetrically arranged on the outer plate surface of the protective side plate (28); each anti-fall plate (281) is located above the measuring side plate (27) on the corresponding side, and along the vertical direction, the projection of each measuring side plate (27) is located within the projection range of the corresponding anti-fall plate (281).

4. A device for detecting ash content in constant-thickness in-situ coal using low-energy gamma rays according to any one of claims 1 to 3, characterized in that: The device further comprises a shipping assembly (40), wherein the shipping assembly (40) comprises a shipping base plate (41) constituting the base, wherein the shipping base plate (41) is slidably arranged on a shipping guide rail (42); the shipping guide rail (42) is mounted on the top surface, and the shipping guide rail (42) and the sampling guide rail (22) are arranged parallel to each other.

5. The device for detecting ash content of constant-thickness in-situ coal using low-energy gamma rays according to claim 4, characterized in that: A consignment screw rod (43) is fixedly connected to the consignment bottom plate (41), and the axial direction of the consignment screw rod (43) is parallel to the length direction of the consignment guide rail (42); and a consignment motor (44) is arranged on the ground and is in transmission cooperation with the consignment screw rod (43).

6. The device for detecting ash content of constant-thickness in-situ coal using low-energy gamma rays according to claim 5, characterized in that: A feeding chute (50) is arranged at the bottom of the coal sample outlet, the chute length direction of the feeding chute (50) and the length direction of the consignment guide rail (42) are parallel to each other, and the consignment guide rail (42) extends into the feeding chute (50).

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