A sample mixing device and detection method for coal quality testing

Abstract

This invention relates to the field of material testing by measuring the chemical properties of materials, specifically providing a sample mixing device and testing method for coal quality testing, aiming to solve the technical problem of significant defects in the sample mixing process. The mixing device includes: a drum, rotatably mounted on a frame in a horizontal direction; multiple material plates, all rotatably mounted on the inner wall of the drum; an adjusting component, located on the outer wall of the drum, for driving the material plates to rotate; and a power component, with its output end connected to one end of the drum for driving the drum to rotate. The testing method includes steps S10: allocating mixing weights; S20: sample mixing; S30: comparing results; and S40: handling anomalies. By thoroughly mixing the samples and comparing sampling tests with multiple mixing weights, the influence of the sampling and mixing stages is minimized, thereby more accurately mapping the thermodynamic characteristic spectrum of the entire batch of coal.

Description

Technical Field

[0001] This invention relates to the technical field of coal quality testing, and more specifically to a sample mixing device and testing method for coal quality testing. Background Technology

[0002] As a core component of coal quality control, the accuracy of coal calorific value testing is directly affected by the scientific nature of its sampling methods.

[0003] Currently, the industry generally uses equal-quantity sampling. However, this mechanism has systemic flaws, primarily in its insufficient adaptability to the physical properties of coal. Since coal from different batches may originate from different mining layers or washing stages within the mine, the coal quality distribution often exhibits non-uniform characteristics. The traditional fixed-point equal-quantity sampling method struggles to effectively capture the calorific value gradient distribution formed by the vertical stratification of the coal seam, resulting in the sample set failing to accurately map the thermodynamic property spectrum of the entire batch of material.

[0004] The sample mixing process in existing testing procedures also has significant shortcomings. Traditional methods typically rely on manual or simple mechanical devices to perform short-term, shallow stirring of the collected coal samples, resulting in the failure to effectively eliminate the spatial heterogeneity of ash, volatile matter, and sulfur distribution in the coal samples. Specifically, due to density differences, coal particles of different sizes exhibit segregation effects during mixing. Larger coal particles settle and aggregate under gravity, while pulverized coal, due to its strong surface adsorption, easily forms localized enrichment zones on the inner wall of the container, causing the particle size distribution of the mixed sample to deviate from the original distribution pattern. Ultimately, this results in a systematic deviation between the calorific value test data and the actual quality of the entire batch of coal. Summary of the Invention

[0005] To address the significant technical problems in the sample mixing process, this invention provides a sample mixing device for coal quality testing. The device involves placing the sample into a drum, driving the drum to rotate using a power component, and then using a material plate to tumble the sample inside the drum, thereby achieving thorough mixing.

[0006] The technical solution of this invention is:

[0007] A method for detecting coal quality includes the following steps:

[0008] Step S10: Assign pooling weights. In the same batch of coal, assign corresponding pooling weights to different train numbers. At least two pooling weights shall be assigned to the same batch.

[0009] Step S20: Sample mixing. Subsamples are drawn from each train according to their weights and thoroughly mixed using a sample mixing device. After mixing, a standard weight sample is retained.

[0010] Step S30: Compare the results. Compare the mixed sample results with different weights. If the deviation exceeds the threshold, it is determined that the coal quality fluctuation within the batch is abnormal.

[0011] Step S40: Anomaly handling involves extending the retention period of the remaining train samples corresponding to the anomaly batch and generating a regulatory report.

[0012] In step S10, the determination of the pooling weights includes the following two methods:

[0013] Method 1: Allocate weights proportionally based on train number and weight;

[0014] Method 2: Allocate weights in any proportion, excluding the weight allocation method in Method 1;

[0015] In step S30, the threshold is 50 kcal. When the absolute value of the calorific value deviation between the mixed samples of method one and method two is greater than 50 kcal, the coal quality fluctuation within the batch is determined to be abnormal.

[0016] Optionally, the sample mixing in step S20 includes the following steps:

[0017] S21. The adjusting component adjusts the angle between the surface of all the material plates and the axis of the roller;

[0018] S22. Add coal sample into the drum through the feed inlet and start the power unit to drive the drum to rotate;

[0019] S23, The cover plate of the sealing component covers the discharge port of the roller;

[0020] S24. Adjusting the assembly to ensure that the surface of all material plates is parallel to the axis of the roller;

[0021] S25. After the drum has been rotating for a certain period of time, open the cover of the sealing component and adjust the surface of all the material plates so that they form an angle with the axis of the drum again.

[0022] S26. Complete mixing and discharge.

[0023] Optionally, in steps S21 and S25, the included angle between the material plate surface and the roller axis is 30° to 60°.

[0024] Optionally, the sample mixing device includes:

[0025] A roller is mounted on the frame and rotates horizontally. One end of the roller is the inlet, and the other end is the outlet.

[0026] Multiple material plates are rotatably mounted on the inner wall of the roller;

[0027] An adjustment assembly is located on the outer wall of the roller. The adjustment assembly is poweredly connected to the rotating shaft of all the material plates and is used to drive the material plates to rotate. The rotation angle of the material plates is less than 90°.

[0028] A power assembly is mounted on the frame. The output end of the power assembly is connected to one end of the drum and is used to drive the drum to rotate.

[0029] Optionally, the adjustment component includes:

[0030] Multiple driving components are provided for each of the material plates and are used to drive the material plates to rotate;

[0031] A connecting member, in the form of a ring, is connected to all the driving members and is rotatably mounted on the outer wall of the roller;

[0032] The motor is located on the outer wall of the drum, and the output shaft of the motor is poweredly connected to the connecting member.

[0033] Optionally, the driving element includes:

[0034] A connecting plate, one end of which is perpendicularly connected to the rotating shaft of the material plate;

[0035] Two pressure rods are located at the other end of the connecting plate, and both pressure rods are provided on the connector;

[0036] The end of the connecting plate is located between the two pressure rods.

[0037] Optionally, the roller has an annular baffle extending inward at one end of the feed inlet;

[0038] A sealing component is provided at one end near the discharge port of the roller, which can block the discharge port of the roller.

[0039] Optionally, the enclosure component includes:

[0040] A cover plate that can cover the discharge port of the roller;

[0041] A telescopic component is provided on the frame, and its telescopic end is connected to the cover plate and is used to drive the cover plate closer to or away from the discharge port of the roller.

[0042] Optionally, the sample mixing in step S20 includes the following steps:

[0043] S21. The adjusting component adjusts the angle between the surface of all the material plates and the axis of the roller;

[0044] S22. Add coal sample into the drum through the feed inlet and start the power unit to drive the drum to rotate;

[0045] S23, The cover plate of the sealing component covers the discharge port of the roller;

[0046] S24. Adjusting the assembly to ensure that the surface of all material plates is parallel to the axis of the roller;

[0047] S25. After the drum has been rotating for a certain period of time, open the cover of the sealing component and adjust the surface of all the material plates so that they form an angle with the axis of the drum again.

[0048] S26. Complete mixing and discharge.

[0049] Optionally, in steps S21 and S25, the included angle between the material plate surface and the roller axis is 30° to 60°.

[0050] Compared with the prior art, the beneficial effects of the present invention are:

[0051] During the sample selection stage, within the same batch of coal, coal from different trains is assigned corresponding mixing weights, and multiple samples are taken from each train, with different weights for each sample. Then, all samples with the same mixing weight are placed in a sample mixing device and thoroughly mixed. After all samples with mixing weights are thoroughly mixed, tests are conducted, and the mixing results with different weights are compared to calculate the difference. It is then determined whether the difference exceeds a threshold. If it does, the coal quality fluctuation within the batch is deemed abnormal.

[0052] During the sample mixing stage, the collected sample is fed into the drum through the inlet. The drum is then driven to rotate continuously by the power component. The sample inside the drum is tumbled by the material plate. After a certain period of time, the sample is fully mixed inside the drum. Finally, the tilt angle of the material plate is adjusted by the adjustment component, and in conjunction with the rotation of the drum, all the sample is discharged from the outlet of the drum.

[0053] In this technical solution, by thoroughly mixing the samples and comparing sampling tests with multiple mixing weights, the influence of the sampling and mixing stages is minimized, thereby more accurately mapping the thermodynamic characteristic spectrum of the entire batch of coal. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 This is a three-dimensional structural diagram of the sample mixing device described in this invention;

[0056] Figure 2for Figure 1 Enlarged view of point A in the middle;

[0057] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0058] Figure 4 This is a three-dimensional structural diagram of one end of the discharge port of the sample mixing device described in this invention;

[0059] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0060] Figure 6 A schematic diagram of the assembly structure for adjusting components and material plates;

[0061] Figure 7 This is a flowchart illustrating the steps of the coal quality testing method described in this invention.

[0062] Figure label:

[0063] 10. Roller; 11. Feed inlet; 12. Discharge outlet; 13. Support groove; 14. Limiting plate; 15. Annular baffle.

[0064] 20. Material plate; 21. Rotating shaft; 22. Curved surface.

[0065] 30. Adjustment component; 31. Connector; 32. Motor; 33. Connecting rod; 34. Metal ring; 35. Metal wheel; 36. Gear; 37. Arc rack; 38. Connecting plate; 39. Pressure rod.

[0066] 40. Power assembly; 41. Gear ring; 42. Power gear set; 43. Support ring; 44. Support wheel; 45. Power motor; 46. Support gear.

[0067] 50. Enclosure component; 51. Cover plate; 52. Telescopic component. Detailed Implementation

[0068] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0069] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0070] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0071] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Example

[0072] This reference Figure 1 and Figure 4 The embodiment discloses a sample mixing device for coal quality testing, including a frame (not shown in the figure), a drum 10, a material plate 20, an adjustment component 30, and a power component 40. The drum 10 is used to hold all the coal samples, and all the coal samples are mixed in the drum 10. The material plate 20 is used to change the movement direction of the coal samples in the drum 10, so as to promote the mixing of the coal samples or move them towards the discharge port 12. The adjustment component 30 is used to change the state of the material plate 20 in the drum 10, so that the material plate 20 produces different effects on the coal samples. The power component 40 is used to drive the drum 10 to rotate.

[0073] Specifically, the roller 10 has a cylindrical structure with a hollow interior and open ends. One end of the roller 10 is the inlet 11, and the other end is the outlet 12. The roller 10 is rotatably mounted on the frame, and its axis is horizontal.

[0074] The power assembly 40 is mounted on the frame. The output end of the power assembly 40 is connected to a power source such as the roller 10, and the roller 10 is driven to rotate continuously through the power assembly 40.

[0075] Several material plates 20 are rotatably arranged on the inner wall of the drum 10. A rotating shaft 21 is provided at one end of each material plate 20 and is rotatably mounted on the drum 10. Several through holes are provided on the wall of the drum 10, through which the rotating shaft 21 passes. A sealed bearing is provided between the rotating shaft 21 and the drum 10. In addition, the axis of the rotating shaft 21 is perpendicular to the axis of the drum 10.

[0076] The rotating shaft 21 passes through one end of the roller 10 and is connected to the adjusting assembly 30. The adjusting assembly 30 can drive the rotating shaft 21 to rotate, thereby causing the material plate 20 to rotate. There is a gap between the end of the material plate 20 connected to the rotating shaft 21 and the inner wall of the roller 10, allowing the material plate 20 to rotate normally inside the roller 10. The rotation angle of the material plate 20 is less than 90°.

[0077] After the material plate 20 rotates, its deflection direction is related to the rotation direction of the drum 10, so that the material plate 20 can drive all the coal samples in the material cylinder to move from the inlet 11 to the outlet 12.

[0078] Preferably, the aforementioned power assembly 40 includes a gear ring 41, a power gear set 42, a support ring 43, a support wheel 44, and a power motor 45. The gear ring 41 is disposed on one end of the drum 10, the support ring 43 is disposed on the other end of the drum 10, the power gear set 42 is disposed on the frame, and one gear of the power gear set 42 meshes with the gear ring 41. Simultaneously, the other gear of the power gear set 42 is connected to the output shaft of the power motor 45. There are two support wheels 44, both rotatably mounted on the frame. The surfaces of the two support wheels 44 have a concave structure and are engaged with the support ring 43. Both support wheels 44 are located near the bottom of the drum 10. Furthermore, the power gear set 42 and the power motor 45 are respectively disposed on one side of the drum 10, and a support gear 46 meshing with the gear ring 41 is disposed on the other side of the drum 10. The support gear 46 is rotatably mounted on the frame.

[0079] In this embodiment, the collected coal sample is fed into the drum 10 through the feed port 11. Then, the power component 40 drives the drum 10 to rotate continuously. The coal sample inside the drum 10 is tumbled by the material plate 20. After a certain period of time, the coal sample is fully mixed inside the drum 10. Finally, the tilt angle of the material plate 20 is adjusted by the adjustment component 30. Combined with the rotation of the drum 10, all the coal samples are discharged from the discharge port 12 of the drum 10.

[0080] In this technical solution, by thoroughly mixing the coal sample, the impact of the mixing stage on the test results is minimized, thereby more accurately mapping the thermodynamic characteristic spectrum of the entire batch of coal.

[0081] In one specific embodiment:

[0082] See Figure 1 , Figure 4 and Figure 6 The adjustment assembly 30 includes a drive component, a connector 31, and a motor 32. The drive component has multiple components and is provided for each material plate 20. The drive component is connected to one end of the rotating shaft 21 that extends out of the roller 10 and is used to directly drive the rotating shaft 21 and the material plate 20 to rotate.

[0083] The connector 31 is ring-shaped and is sleeved on the outer surface of the roller 10. The drive component is mounted on the connector 31 and drives the drive component through the connector 31, thereby driving the rotating shaft 21 and the material plate 20 to rotate.

[0084] Specifically, multiple material plates 20 are arranged in a ring inside the drum 10. The material plates 20 on the same ring form a plate group, and multiple plate groups are arranged along the axial direction of the drum 10. Each plate group corresponds to a connector 31, and the driving component for driving all material plates 20 in the same plate group is installed on the same connector 31. All connectors 31 are connected as one unit by connecting rods 33.

[0085] The motor 32 is mounted on the outer wall of the drum 10. The output shaft of the motor 32 is poweredly connected to the connector 31 and is used to drive the connector 31 to rotate at a certain angle, thereby driving all the driving components through the connector 31, and in turn driving all the rotating shafts 21 and the material plate 20 to rotate.

[0086] Preferably, see Figure 5 A metal ring 34 is provided at each end of the roller 10. The two metal rings 34 are connected to the two electrodes of the motor 32 via wires, and insulating gaskets are placed between the metal rings 34 and the roller 10. Additionally, two metal wheels 35 are mounted on the frame via plastic brackets, and each metal wheel 35 contacts one of the two metal rings 34. Bearings are installed between the axle and the wheel surface of each metal wheel 35, and the axle is connected to a power supply and a switch via wires. The metal rings 34 and metal wheels 35 provide electrical connection between the power supply, the switch, and the motor 32.

[0087] In another preferred embodiment, see Figure 3 Multiple support grooves 13 are provided on the outer surface of the roller 10, wherein each connector 31 is slidably disposed within the multiple support grooves 13. The support grooves 13 limit and support the connector 31.

[0088] In another preferred embodiment, see Figure 2 A gear 36 is provided on the output shaft of the motor 32, and an arc-shaped rack 37 is provided on the connector 31. The arc-shaped rack 37 meshes with the gear 36. The arc-shaped rack 37 is driven by the gear 36 on the motor 32, thereby driving the connector 31 to rotate.

[0089] In another specific embodiment:

[0090] See Figure 6 The driving component includes a connecting plate 38 and a pressure rod 39. One end of the connecting plate 38 is fixedly connected to one end of the rotating shaft 21 that passes through the roller 10, and the length direction of the connecting plate 38 is perpendicular to the axis of the rotating shaft 21.

[0091] A pressure rod 39 is provided near the other end of the connecting plate 38. The length direction of the two pressure rods 39 is parallel to the axis of the rotating shaft 21, and the two pressure rods 39 are located on the upper and lower sides of the connecting plate 38, respectively. Both pressure rods 39 are connected to the connector 31.

[0092] In this embodiment, when the connector 31 rotates, it drives the two pressure rods 39 to move together. The pressure rods 39 then press against the end of the connecting plate 38, causing the connecting plate 38 to rotate, which in turn drives the rotating shaft 21 and the material plate 20 to rotate together. By providing two pressure rods 39, when the connector 31 rotates in the opposite direction, the other pressure rod 39 can drive the connecting plate 38 to rotate in the opposite direction, thereby driving the rotating shaft 21 and the material plate 20 in the opposite direction.

[0093] Preferably, a limiting plate 14 is installed on the outer wall of the roller 10. When the surface of the material plate 20 is parallel to the axis of the roller 10, the gear 36 on the motor 32 is located at one end of the arc rack 37. At the same time, the connecting plate 38 contacts the limiting plate 14, so that the motor 32 can only drive the material plate 20 to rotate in one direction.

[0094] In another specific embodiment:

[0095] See Figure 1 The drum 10 has an annular baffle 15 extending inward at one end of the feed inlet 11, with the feed inlet 11 formed in the middle of the annular baffle 15. A sealing component 50 is provided near the discharge outlet 12 of the drum 10, which can block the discharge outlet 12. This design prevents coal samples from overflowing from the feed inlet 11 and discharge outlet 12 of the drum 10 during mixing.

[0096] Specifically, the sealing assembly 50 includes a cover plate 51 and a telescopic component 52. The cover plate 51 is located near the discharge port 12 of the roller 10, and the cover plate 51 is circular with a diameter larger than the inner diameter of the roller 10. The cover plate 51 is coaxially arranged with the roller 10. The telescopic component 52 is provided on the side of the cover plate 51 away from the roller 10 and is mounted on the frame. The telescopic end of the telescopic component 52 drives the cover plate 51 to move closer to or away from the discharge port 12 of the roller 10.

[0097] Generally, the telescopic component 52 can be a hydraulic cylinder, a pneumatic cylinder, or a linear drive motor.

[0098] When the coal sample inside the drum 10 is being mixed, the cover plate 51 is driven to contact the discharge port 12 of the drum 10 by the telescopic member 52, thereby preventing the coal sample from overflowing from the discharge port 12.

[0099] In another specific embodiment:

[0100] See Figure 6 The working surface of the material plate 20 is an arc-shaped surface 22. This means that the power assembly 40 drives the drum 10 to rotate in only one direction, and during the rotation of the drum 10, the side of the material plate 20 used to lift the coal sample is the working surface. By setting the working surface of the material plate 20 to an arc-shaped surface 22, the coal sample can be lifted to a greater height compared to a planar working surface, thus reducing the mixing time. Example

[0101] This reference Figure 7 The embodiment discloses a method for detecting coal quality, including the following steps:

[0102] Step S10: Assign pooling weights. In the same batch of coal, assign corresponding pooling weights to different train numbers. At least two pooling weights shall be assigned to the same batch.

[0103] In step S10, the determination of the mixed sample weight includes two methods: Method 1, allocating the weight proportionally according to the weight of the train, which is the most representative of the complete batch; Method 2, allocating the weight in any proportion, which involves randomly selecting coal samples from all trains until the amount of coal samples meets the requirements.

[0104] In the same batch of coal, the total weight of coal samples selected by different pooling weights is the same. For example, if a batch of coal consists of 5 trucks, each carrying 12 tons of coal, and both Method 1 and Method 2 collect a total weight of 10 kg of coal samples, then Method 1 will take 2 kg of coal samples from each truck according to the proportion, while Method 2 will randomly take a total of 10 kg of coal samples from the 5 trucks, but the option of taking 2 kg of coal samples from each truck needs to be excluded.

[0105] Step S20: Coal sample mixing. Subsamples are extracted from each train according to their weights and thoroughly mixed using the coal sample mixing device described in any one of claims 1-5. After mixing, a standard weight sample is retained.

[0106] The specific steps involved in mixing coal samples are as follows:

[0107] S21. Adjusting component 30 adjusts the angle between the surface of all material plates 20 and the axis of roller 10 (30° to 60°, generally 45° is selected).

[0108] S22. Add coal samples into the drum 10 through the feed inlet 11 and start the power unit 40 to drive the drum 10 to rotate continuously. At this time, all the coal samples accumulated in the feed inlet 11 move towards the discharge outlet 12.

[0109] S23, the cover plate 51 of the sealing component 50 covers the discharge port 12 of the roller 10 to prevent coal samples from overflowing from the discharge port 12.

[0110] S24. Adjusting component 30 adjusts all the surfaces of the material plates 20 to be parallel to the axis of the roller 10, and begins mixing.

[0111] S25. After the drum 10 continues to rotate for a certain period of time to achieve the requirement of thorough mixing, open the cover plate 51 of the sealing component 50 and adjust the plate surfaces of all the material plates 20 so that they form an angle with the axis of the drum 10 again (30° to 60°, generally 45° is selected).

[0112] S26. During the adjustment of the included angle of the material plate 20, and after the adjustment is completed, the drum 10 continues to rotate at a constant speed, so that the mixed coal sample is discharged from the discharge port 12, completing the mixing and discharge.

[0113] Step S30: Compare the results. If the deviation exceeds the threshold, the coal quality fluctuation within the batch is determined to be abnormal.

[0114] When the quality of coal in the same batch is similar, the mixing method 2 is not affected by weighting and should be equivalent to the mixing method 1. The coal quality deviation should be within a reasonable range. Similarly, the coal quality of coal mined from the same mine on the same day and sent to different power plants should also be within the same reasonable range, such as 50 kcal.

[0115] When there are significant differences in coal quality within the same batch, the mixture sample of Method 2 will vary with the weighting and is likely to deviate from the mixture sample of Method 1. The greater the deviation in coal quality between different weighted mixtures, the greater the fluctuation in coal quality between different trains within the same batch.

[0116] Therefore, the threshold is set to 50 kcal. When the absolute value of the calorific value deviation between the mixed samples of Method 1 and Method 2 is greater than 50 kcal, the coal quality fluctuation within the batch is determined to be abnormal.

[0117] Step S40, Anomaly Handling: Extend the retention period of the remaining train samples corresponding to the abnormal batch, generate a regulatory report, and focus on monitoring.

[0118] Alternatively, in step S10, method two can involve multiple sets of random sampling, which are then compared with the results of method one in step S30 to achieve a more accurate determination.

[0119] In this embodiment, within the same batch of coal, coal from different trains is assigned corresponding mixing weights, and multiple samples are taken from each train, with different weights for each sample. Then, all samples with the same mixing weight are placed in a sample mixing device and thoroughly mixed. After all samples with mixing weights are thoroughly mixed, a test is performed, and the mixing results with different weights are compared to calculate the difference. It is then determined whether the difference exceeds a threshold. If it does, the coal quality fluctuation within the batch is deemed abnormal.

[0120] In this technical solution, by comparing sampling tests with multiple sample mixing weights, the influence of the sampling stage is minimized, thereby more accurately mapping the thermodynamic characteristic spectrum of the entire batch of coal.

[0121] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for detecting coal quality, characterized in that, Includes the following steps: Step S10: Assign pooling weights. In the same batch of coal, assign corresponding pooling weights to different train numbers. At least two pooling weights shall be assigned to the same batch. Step S20: Sample mixing. Subsamples are drawn from each train according to their weights and thoroughly mixed using a sample mixing device. After mixing, a standard weight sample is retained. Step S30: Compare the results. Compare the mixed sample results with different weights. If the deviation exceeds the threshold, it is determined that the coal quality fluctuation within the batch is abnormal. Step S40: Anomaly handling involves extending the retention period of the remaining train samples corresponding to the anomaly batch and generating a regulatory report. In step S10, the determination of the pooling weights includes the following two methods: Method 1: Allocate weights proportionally based on train number and weight; Method 2: Allocate weights in any proportion, excluding the weight allocation method in Method 1; In step S30, the threshold is 50 kcal. When the absolute value of the calorific value deviation between the mixed samples of method one and method two is greater than 50 kcal, the coal quality fluctuation within the batch is determined to be abnormal.

2. The method for detecting coal quality according to claim 1, characterized in that, The sample mixing device includes: A roller is mounted on the frame and rotates horizontally. One end of the roller is the inlet, and the other end is the outlet. Multiple material plates are rotatably mounted on the inner wall of the roller; An adjustment assembly is located on the outer wall of the roller. The adjustment assembly is poweredly connected to the rotating shaft of all the material plates and is used to drive the material plates to rotate. The rotation angle of the material plates is less than 90°. A power assembly is mounted on the frame. The output end of the power assembly is connected to one end of the drum and is used to drive the drum to rotate.

3. The method for detecting coal quality according to claim 2, characterized in that, The adjustment component includes: Multiple driving components are provided for each of the material plates and are used to drive the material plates to rotate; A connecting member, in the form of a ring, is connected to all the driving members and is rotatably mounted on the outer wall of the roller; The motor is located on the outer wall of the drum, and the output shaft of the motor is poweredly connected to the connecting member.

4. The method for detecting coal quality according to claim 3, characterized in that, The driving component includes: A connecting plate, one end of which is perpendicularly connected to the rotating shaft of the material plate; Two pressure rods are located at the other end of the connecting plate, and both pressure rods are provided on the connector; The end of the connecting plate is located between the two pressure rods.

5. The method for detecting coal quality according to claim 2, characterized in that: The roller has an annular baffle extending inward at one end of the feed inlet. A sealing component is provided at one end near the discharge port of the roller, which can block the discharge port of the roller.

6. The method for detecting coal quality according to claim 5, characterized in that, The enclosed component includes: A cover plate that can cover the discharge port of the roller; A telescopic component is provided on the frame, and its telescopic end is connected to the cover plate and is used to drive the cover plate closer to or away from the discharge port of the roller.

7. The method for detecting coal quality according to claim 6, characterized in that, The sample mixing in step S20 includes the following steps: S21. The adjusting component adjusts the angle between the surface of all the material plates and the axis of the roller; S22. Add coal sample into the drum through the feed inlet and start the power unit to drive the drum to rotate; S23, The cover plate of the sealing component covers the discharge port of the roller; S24. Adjusting the assembly to ensure that the surface of all material plates is parallel to the axis of the roller; S25. After the drum has been rotating for a certain period of time, open the cover of the sealing component and adjust the surface of all the material plates so that they form an angle with the axis of the drum again. S26. Complete mixing and discharge.

8. The method for detecting coal quality according to claim 7, characterized in that, In steps S21 and S25, the included angle between the material plate surface and the roller axis is 30° to 60°.

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