Sample mixing device for coal quality detection and detection method

Abstract

The invention relates to the field of testing materials by means of measuring chemical properties of the materials, particularly provides a sample mixing device for coal quality detection and a detection method, and aims to solve the technical problem that remarkable defects exist in a sample mixing treatment link. The mixing device comprises a roller which is rotatably arranged on a rack along the horizontal direction; the plurality of material plates are rotationally arranged on the inner wall of the roller; the adjusting assembly is arranged on the outer wall of the roller and used for driving the material plate to rotate; the output end of the power assembly is in power connection with one end of the roller and used for driving the roller to rotate. The detection method comprises the following steps: step S10, distributing a sample mixing weight; step S20, mixing the samples; step S30, comparing a result; and S40, performing exception handling. Through full mixing of samples and sampling test comparison of multiple sample mixing weights, the influence of a sampling stage and a mixing stage is reduced to the minimum, so that the thermodynamic characteristic spectrum of the whole batch of coal is mapped more accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of coal quality detection, and particularly to a sample mixing device and a detection method for coal quality detection. Background Art

[0002] As the core link of coal calorific value detection in coal combustion quality control, the scientificity of its sampling method directly affects the accuracy of the detection result.

[0003] At present, equal - quantity sampling is commonly used in the industry. The equal - quantity sampling mechanism has systematic defects, mainly manifested in the insufficient adaptability of the sampling strategy to the physical properties of coal. Since the coal in different train carriages may come from different mining layers or washing stages in the mine, the coal quality distribution often shows non - uniform characteristics. The traditional fixed - point equal - quantity sampling mode is difficult to effectively capture the calorific value gradient distribution formed by the longitudinal stratification of the coal seam, resulting in the sample set being unable to accurately map the thermodynamic property spectrum of the entire batch of materials.

[0004] In the existing detection process, there are also significant defects in the sample mixing process. Traditional methods usually rely on manual or simple mechanical devices to stir the collected coal samples for a short time and shallowly, resulting in the ineffective elimination of the spatial distribution heterogeneity of ash, volatile matter, and sulfur in the coal samples. Specifically, due to the density difference, different - sized coal particles produce a segregation effect during the mixing process. Large - sized coal particles sink and aggregate under the action of gravity, while pulverized coal is prone to form a local enrichment area on the inner wall of the container due to its strong surface adsorption, resulting in the particle size composition of the mixed sample deviating from the original distribution law. Eventually, it causes a systematic deviation between the calorific value detection data and the actual quality of the entire batch of coal. Summary of the Invention

[0005] Aiming at the technical problem of significant defects in the sample mixing process, the present invention provides a sample mixing device for coal quality detection. By putting the sample into the drum, then using the power component to drive the drum to rotate, and then making the sample in the drum tumble through the material plates, the purpose of full mixing is achieved.

[0006] The technical solution of the present invention is as follows: A sample mixing device for coal quality detection, comprising: A drum, rotatably arranged on the frame in the horizontal direction, one end of the drum is the feeding port, and the other end is the discharging port; A plurality of material plates, all rotatably arranged on the inner wall of the drum; An adjusting component, arranged on the outer wall of the drum, the adjusting component is power - connected to the rotating shafts of all the material plates and is used to drive the material plates to rotate, and the rotation angle of the material plate is less than 90°; A power component, arranged on the frame, the output end of the power component is power - connected to one end of the drum and is used to drive the drum to rotate.

[0007] Optionally, the adjusting assembly includes: A plurality of driving members, provided corresponding to each of the material plates and configured to drive the material plates to rotate; A connecting member, in a ring shape, the connecting member is connected to all the driving members and is rotatably disposed on the outer wall of the drum; A motor, disposed on the outer wall of the drum, and an output shaft of the motor is in power connection with the connecting member.

[0008] Optionally, the driving member includes: A connecting plate, one end of which is vertically connected to the rotating shaft of the material plate; Two pressing rods, located at the other end of the connecting plate, and both of the two pressing rods are disposed on the connecting member; Wherein, an end portion of the connecting plate is located between the two pressing rods.

[0009] Optionally, an annular baffle extending inwardly is provided at one end of the drum at the inlet; A closing assembly is provided at one end close to the discharge port of the drum, and the closing assembly can block the discharge port of the drum.

[0010] Optionally, the closing assembly includes: A cover plate, capable of covering the discharge port of the drum; A telescopic member, disposed on the frame, and a telescopic end thereof is connected to the cover plate and configured to drive the cover plate to approach or move away from the discharge port of the drum.

[0011] Aiming at the technical problem that the equal - quantity sampling mechanism has systematic defects, the present invention provides a method for detecting coal quality. By calculating the calorific value of multiple weighted sampling methods and comparing the calorific value data under different methods, it is determined whether the coal quality fluctuation is within a reasonable range, so as to accurately map the thermodynamic characteristic spectrum of the whole batch of coal.

[0012] The technical solution of the present invention is: A method for detecting coal quality, comprising the following steps: Step S10: Allocate mixing weights. In the coal of the same batch, different vehicle trips are allocated their corresponding mixing weights, and at least two mixing weights are allocated for the same batch; Step S20: Mix samples. Sub - samples are extracted from each vehicle trip according to the weights and are fully mixed using the sample mixing device according to any one of claims 1 - 5. After mixing, a standard - weight sample is reserved; Step S30: Compare results. Compare the mixing results of different weights. If the deviation exceeds the threshold, it is determined that the coal quality fluctuation within the batch is abnormal; Step S40, Exception handling: Extend the retention period of the remaining train samples corresponding to the abnormal batch and generate a supervision report.

[0013] Optionally, in step S10, the determination of the mixing weight includes the following two methods: Method 1: Allocate weights in proportion to the train weight. Method 2: Allocate weights in any proportion.

[0014] Optionally, in step S30, the threshold is 50 kcal. When the absolute value of the deviation of the mixing calorific value between Method 1 and Method 2 > 50 kcal, it is determined that the coal quality fluctuation within the batch is abnormal.

[0015] Optionally, the sample mixing in step S20 includes the following steps: S21. The adjusting component adjusts the plate surfaces of all the material plates to form an angle with the axis of the drum. S22. Add coal samples into the drum from the feeding port and start the power component to drive the drum to rotate. S23. The cover plate of the closing component covers the discharge port of the drum. S24. The adjusting component adjusts the plate surfaces of all the material plates to be parallel to the axis of the drum. S25. After the drum rotates continuously for a certain time, open the cover plate of the closing component and adjust the plate surfaces of all the material plates to form an angle with the axis of the drum again. S26. Complete the mixing and discharge the materials.

[0016] Optionally, in steps S21 and S25, the angle between the plate surface of the material plate and the axis of the drum is 30° to 60°.

[0017] Compared with the prior art, the beneficial effects of the present invention are: In the sample selection stage, within the same batch of coal, corresponding mixing weights are assigned to the coal of different trains, and each train is sampled multiple times with different weights each time. Then, all the samples with the same mixing weight are fully mixed in the sample mixing device. After all the samples with different mixing weights are fully mixed, tests are carried out, and then the mixing results with different weights are compared, the difference is calculated, and it is judged whether the difference exceeds the threshold. If it exceeds, it is determined that the coal quality fluctuation within the batch is abnormal.

[0018] In the sample mixing stage, the collected samples are put into the drum from the feeding port, and then the power component is used to drive the drum to rotate continuously. Then, the samples in the drum are tumbled through the material plates. After a certain time, the samples are fully mixed in the drum. Finally, the inclination angle of the material plates is adjusted by the adjusting component, and combined with the rotation of the drum, all the samples are discharged from the discharge port of the drum.

[0019] In this technical solution, through the sufficient mixing of samples and the sampling and testing comparison with various mixing weights, the influences in the sampling stage and the mixing stage are minimized, so as to more accurately map the thermodynamic characteristic spectrum of the whole batch of coal. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic three-dimensional structure diagram of the sample mixing device described in the present invention; Figure 2 For Figure 1 Enlarged schematic diagram at position A in Figure 3 For Figure 1 Enlarged schematic diagram at position B in Figure 4 Schematic three-dimensional structure diagram of one end of the discharge port of the sample mixing device described in the present invention; Figure 5 For Figure 4 Enlarged schematic diagram at position C in Figure 6 Assembly structure diagram of the adjusting component and the material plate; Figure 7 Step diagram of the coal quality detection method described in the present invention.

[0022] Reference Signs: 10, drum; 11, feed inlet; 12, discharge outlet; 13, support groove; 14, limiting plate; 15, annular baffle.

[0023] 20, material plate; 21, rotating shaft; 22, arc surface.

[0024] 30, adjusting component; 31, connecting piece; 32, motor; 33, connecting rod; 34, metal ring; 35, metal wheel; 36, gear; 37, arc rack; 38, connecting plate; 39, pressing rod.

[0025] 40, power component; 41, tooth ring; 42, power gear set; 43, support ring; 44, support wheel; 45, power motor; 46, support gear.

[0026] 50, closing component; 51, cover plate; 52, telescopic member. Detailed Description of the Embodiments

[0027] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the accompanying drawings and the description are considered to be exemplary in nature rather than restrictive.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the products of the present invention are customarily placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0030] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Embodiment 1

[0032] Refer to Figure 1 and Figure 4 , the embodiment discloses a sample mixing device for coal quality detection, including a frame (not shown in the figure), a drum 10, a material plate 20, an adjustment assembly 30, and a power assembly 40. Among them, the drum 10 is used to hold all coal samples, and all 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, prompting the coal samples to mix or move towards the discharge port 12. The adjustment assembly 30 is used to change the state of the material plate 20 in the drum 10, so that the material plate 20 has different effects on the coal samples. The power assembly 40 is used to drive the drum 10 to rotate.

[0033] Specifically, the drum 10 has a cylindrical structure with a hollow interior and open ends. One end of the drum 10 is the feed inlet 11, and the other end is the discharge outlet 12. The drum 10 is rotatably arranged on the frame, and the axis of the drum 10 is arranged horizontally.

[0034] The power assembly 40 is arranged on the frame. The output end of the power assembly 40 is in power connection with one end of the drum 10, and the drum 10 is driven to rotate continuously by the power assembly 40.

[0035] A number of material plates 20 are rotatably arranged on the inner wall of the drum 10. One end of the material plate 20 is provided with a rotating shaft 21. The rotating shaft 21 is rotatably arranged on the drum 10. A number of through holes are provided on the wall surface of the drum 10. The rotating shaft 21 passes through the drum 10 through the through holes, and a sealing bearing is arranged between the rotating shaft 21 and the drum 10. In addition, the axis of the rotating shaft 21 is perpendicular to and intersects the axis of the drum 10.

[0036] One end of the rotating shaft 21 passing through the drum 10 is connected to the adjusting assembly 30. The rotating shaft 21 can be driven to rotate through the adjusting assembly 30, thereby driving the material plate 20 to rotate. There is a gap between one end of the material plate 20 connected to the rotating shaft 21 and the inner wall of the drum 10, so that the material plate 20 can rotate normally inside the drum 10. The rotation angle of the material plate 20 is less than 90°.

[0037] After the material plate 20 rotates, the deflection direction has a certain relationship with the rotation direction of the drum 10, so that the material plate 20 can drive all the coal samples in the drum from the feed inlet 11 to the discharge outlet 12.

[0038] Preferably, the above-mentioned power assembly 40 includes a toothed ring 41, a power gear set 42, a support ring 43, support wheels 44 and a power motor 45. The toothed ring 41 is arranged at one end of the drum 10, the support ring 43 is arranged at the other end of the drum 10, the power gear set 42 is arranged on the frame, and one gear in the power gear set 42 meshes with the toothed ring 41. At the same time, another gear of the power gear set 42 is connected to the output shaft of the power motor 45. There are two support wheels 44, all of which are rotatably arranged on the frame. The wheel surfaces of the two support wheels 44 are concave structures and are stuck on the support ring 43. The two support wheels 44 are both close to the bottom of the drum 10. In addition, the power gear set 42 and the power motor 45 are respectively arranged on one side of the drum 10, and a support gear 46 meshing with the toothed ring 41 is also arranged on the other side of the drum 10. The support gear 46 is rotatably arranged on the frame.

[0039] In this embodiment, the collected coal samples are put into the drum 10 from the feed inlet 11, and then the power assembly 40 is used to drive the drum 10 to rotate continuously. Then, the coal samples in the drum 10 are tumbled by the material plates 20. After a certain period of time, the coal samples are fully mixed in the drum 10. Finally, the inclination angle of the material plates 20 is adjusted by the adjustment assembly 30, and combined with the rotation of the drum 10, all the coal samples are discharged from the discharge outlet 12 of the drum 10.

[0040] In this technical solution, by fully mixing the coal samples, the influence of the mixing stage on the test results is minimized, so as to more accurately map the thermodynamic characteristic spectrum of the entire batch of coal.

[0041] In one specific embodiment: See Figure 1 、 Figure 4 and Figure 6 The adjustment assembly 30 includes driving members, a connecting member 31 and a motor 32. Among them, there are multiple driving members, which are provided corresponding to each material plate 20. The driving member is connected to one end of the rotating shaft 21 passing through the drum 10 and is used to directly drive the rotating shaft 21 and the material plate 20 to rotate.

[0042] The connecting member 31 is annular and sleeved on the outer surface of the drum 10. The driving member is installed on the connecting member 31. The connecting member 31 drives the driving member, so as to drive the rotating shaft 21 and the material plate 20 to rotate through the driving member.

[0043] Specifically, a plurality of material plates 20 are annularly distributed in the drum 10. The material plates 20 on the same ring form a plate group. Along the axial direction of the drum 10, a plurality of plate groups are provided. Each plate group corresponds to a connecting member 31, and the driving members for driving all the material plates 20 in the same plate group are installed on the same connecting member 31. All the connecting members 31 are connected into one body through a connecting rod 33.

[0044] The motor 32 is installed on the outer wall of the drum 10. The output shaft of the motor 32 is power-connected to the connecting member 31 and is used to drive the connecting member 31 to rotate by a certain angle, so as to drive all the driving members through the connecting member 31, and further drive all the rotating shafts 21 and the material plates 20 to rotate.

[0045] Preferably, see Figure 5, a metal ring 34 is respectively arranged at both ends of the drum 10. The two metal rings 34 are respectively connected to the two electrodes of the motor 32 through wires, and an insulating gasket is arranged between the metal ring 34 and the drum 10. In addition, two metal wheels 35 are installed on the frame. The metal wheels 35 are installed on the frame through plastic brackets, and the two metal wheels 35 are respectively in contact with the two metal rings 34. A bearing is arranged between the axle and the wheel surface of the metal wheel 35, and the axle is connected to the power supply and the switch through a wire. By arranging the metal ring 34 and the metal wheel 35, the electrical connection between the power supply, the switch and the motor 32 is realized.

[0046] In another preferred solution, refer to Figure 3 , a plurality of support grooves 13 are arranged on the outer surface of the drum 10. Among them, each connecting piece 31 is slidably arranged in the plurality of support grooves 13. The connecting piece 31 is limited and supported by the support grooves 13.

[0047] In another preferred solution, refer to Figure 2 , a gear 36 is arranged on the output shaft of the motor 32, and an arc-shaped rack 37 is arranged on the connecting piece 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, so as to drive the connecting piece 31 to rotate through the arc-shaped rack 37.

[0048] In another specific embodiment: Refer to Figure 6 , the driving member includes a connecting plate 38 and a pressing rod 39. Among them, one end of the connecting plate 38 is fixedly connected to the end of the rotating shaft 21 passing through the drum 10, and the length direction of the connecting plate 38 is perpendicular to the axis of the rotating shaft 21.

[0049] A pressing rod 39 is respectively arranged at a position close to the other end of the connecting plate 38. The length directions of the two pressing rods 39 are parallel to the axis of the rotating shaft 21, and the two pressing rods 39 are respectively located on the upper and lower sides of the connecting plate 38. The two pressing rods 39 are both connected to the connecting piece 31.

[0050] In this embodiment, when the connecting piece 31 rotates, the two pressing rods 39 are driven to move together, and then through the pressing action of the pressing rod 39 on the end of the connecting plate 38, the driving of the connecting plate 38 to rotate is realized, and then the rotating shaft 21 and the material plate 20 are driven to rotate together. By arranging the two pressing rods 39, when the connecting piece 31 rotates in the reverse direction, the other pressing rod 39 can drive the connecting plate 38 to rotate in the reverse direction, so as to drive the rotating shaft 21 and the material plate 20 in the reverse direction.

[0051] Preferably, a limiting plate 14 is installed on the outer wall of the drum 10. When the plate surface of the material plate 20 is parallel to the axis of the drum 10, the gear 36 on the motor 32 is located at one end of the arc-shaped 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.

[0052] In another specific embodiment: See Figure 1 , an annular baffle 15 extending inward is provided at one end of the drum 10 where the feed inlet 11 is located. The middle of the annular baffle 15 forms the above-mentioned feed inlet 11. A closing assembly 50 is provided at one end close to the discharge outlet 12 of the drum 10. The closing assembly 50 can block the discharge outlet 12 of the drum 10. Through this design, it is possible to prevent the coal sample from overflowing from the feed inlet 11 and the discharge outlet 12 of the drum 10 when the coal sample is mixed in the drum 10.

[0053] Specifically, the closing assembly 50 includes a cover plate 51 and a telescopic member 52. The cover plate 51 is close to the discharge outlet 12 of the drum 10, and the cover plate 51 is circular. The diameter of the cover plate 51 is larger than the inner diameter of the drum 10, and the cover plate 51 is coaxially arranged with the drum 10. A telescopic member 52 is arranged on the side surface of the cover plate 51 away from the drum 10, and the telescopic member 52 is arranged on the frame. The cover plate 51 is driven to approach or move away from the discharge outlet 12 of the drum 10 by the telescopic end of the telescopic member 52.

[0054] Generally, the telescopic member 52 can be selected from a hydraulic cylinder, a pneumatic cylinder or a linear drive motor.

[0055] When the coal sample in the drum 10 is being mixed, the cover plate 51 is driven by the telescopic member 52 to contact the discharge outlet 12 of the drum 10, thereby preventing the coal sample from overflowing from the discharge outlet 12.

[0056] In another specific embodiment: See Figure 6 , the acting surface of the material plate 20 is an arc surface 22. It can be understood that the power assembly 40 only drives the drum 10 to rotate in one direction, and during the rotation of the drum 10, the side surface of the material plate 20 for lifting the coal sample is the acting surface. By setting the acting surface of the material plate 20 as the arc surface 22 structure, the lifting height of the coal sample can be higher than that of the acting surface with a flat structure, and the mixing working time can be reduced.

[0057] Embodiment 2

[0058] This reference Figure 7 , this embodiment discloses a method for detecting the quality of coal, including the following steps: Step S10, allocate the mixing sample weights. Among the coals in the same batch, different vehicle trips are allocated their corresponding mixing sample weights, and at least two mixing sample weights are allocated for the same batch.

[0059] In step S10, there are two ways to determine the mixed sample weight: the first way is to allocate weights in proportion to the weight of the train, which is the most representative of the complete batch; the second way is to allocate weights in an arbitrary proportion, which is to randomly select coal samples from all the coal in the trains until the coal sample quantity reaches the requirement.

[0060] In the same batch of coal, the total weight of coal samples selected by different mixed sampling weights is the same. For example, a batch of 5 coal cars each carries 12 tons of coal. Method 1 and Method 2 both collect coal samples with a total weight of 10 kg. Method 1 then takes 2 kg of coal samples from each car of coal in proportion, while Method 2 randomly takes a total of 10 kg of coal samples from the 5 coal cars, but the option of taking 2 kg of coal samples from each car of coal needs to be excluded.

[0061] Step S20: coal sample mixing. Subsamples are drawn from each train according to weights and fully mixed using the coal sample mixing device described in any one of claims 1 to 5. After mixing, standard weight samples are retained.

[0062] The specific coal sample mixing includes the following steps: S21, the adjusting assembly 30 adjusts the angle between the surface of all the sheets 20 and the axis of the roller 10 (30° to 60°, generally 45°); S22, add the coal sample into the drum 10 from the inlet 11, and start the power assembly 40 to drive the drum 10 to rotate continuously. At this time, all the coal samples accumulated in the inlet 11 move toward the discharge port 12.

[0063] S23 , the cover plate 51 of the closing assembly 50 covers the discharge port 12 of the drum 10 to prevent the coal sample from overflowing from the discharge port 12 .

[0064] S24, the adjusting component 30 adjusts the plate surfaces of all the material plates 20 to be parallel to the axis of the drum 10, and starts mixing.

[0065] S25. The drum 10 rotates continuously for a certain period of time. After the mixing is fully achieved, the cover 51 of the sealing assembly 50 is opened, and the surface of all the material sheets 20 is adjusted so that an angle (30° to 60°, generally 45°) is formed with the axis of the drum 10 again.

[0066] S26. During the process of adjusting the angle of the material plate 20 and after the adjustment is completed, the drum 10 keeps rotating at a constant speed, so that the mixed coal sample is discharged from the discharge port 12, completing the mixing and discharging.

[0067] Step S30: Compare the results, compare the mixed sample results with different weights, and if the deviation exceeds the threshold, it is determined that the coal quality fluctuation within the batch is abnormal.

[0068] When the coal quality within the same batch is similar, the mixed sampling method two is not affected by weighting and should be equivalent to the mixed sampling method one. The coal quality deviation should be within a reasonable range. Similarly, the coal quality of coal mined from the same coal mine on the same day and sent to different power plants should also be within the same reasonable range, such as 50 kcal.

[0069] When the coal quality within the same batch varies greatly, the mixed sampling method two changes with the change of weighting and there is probably a deviation from the mixed sampling method one. The greater the coal quality deviation between different weighted mixed samplings, the greater the coal quality deviation between train trips within the same batch.

[0070] Therefore, the above threshold is set to 50 kcal. When the absolute value of the calorific value deviation between the mixed samples of method one and method two > 50 kcal, it is determined that the coal quality fluctuation within the batch is abnormal.

[0071] Step S40, abnormal handling: extend the retention period of the remaining train trip samples corresponding to the abnormal batch, generate a supervision report, and conduct key supervision.

[0072] In addition, in method two of step S10, it can be multiple groups of random samplings, and then compare with the results of method one in step S30 to achieve a more accurate determination.

[0073] In this embodiment, within the coal of the same batch, corresponding mixed sampling weights are assigned to the coal of different train trips, and each train trip is sampled multiple times with different weights each time. Then, all samples with the same mixed sampling weight are fully mixed in the sample mixing device. After all samples with different mixed sampling weights are fully mixed, a test is conducted. Then, the mixed sampling results with different weights are compared, the difference is calculated, and it is judged whether the difference exceeds the threshold. If it exceeds, it is determined that the coal quality fluctuation within the batch is abnormal.

[0074] In this technical solution, through the sampling tests and comparisons with various mixed sampling weights of the samples, the influence in the sampling stage is minimized, so as to more accurately map the thermodynamic characteristic spectrum of the entire batch of coal.

[0075] The above embodiments only represent the specific implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A sample mixing device for coal quality detection, characterized in that, Comprising: A drum, rotatably arranged on a frame in a horizontal direction, one end of the drum being a feeding port and the other end being a discharging port; A plurality of material plates, all rotatably arranged on the inner wall of the drum; An adjusting assembly, arranged on the outer wall of the drum, the adjusting assembly being power-connected to the rotating shafts of all the material plates and used for driving the material plates to rotate, the rotation angle of the material plates being less than 90°; A power assembly, arranged on the frame, the output end of the power assembly being power-connected to one end of the drum and used for driving the drum to rotate.

2. The sample mixing device for coal quality detection according to claim 1, wherein The adjusting assembly includes: A plurality of driving members, provided corresponding to each of the material plates and used for driving the material plates to rotate; A connecting member, in a ring shape, the connecting member being connected to all the driving members and rotatably arranged on the outer wall of the drum; A motor, arranged on the outer wall of the drum, the output shaft of the motor being power-connected to the connecting member.

3. The sample mixing device for coal quality detection according to claim 2, wherein The driving member includes: A connecting plate, one end of which is perpendicularly connected to the rotating shaft of the material plate; Two pressing rods, located at the other end of the connecting plate, both of the two pressing rods being arranged on the connecting member; Wherein, the end of the connecting plate is located between the two pressing rods.

4. The sample mixing device for coal quality detection according to claim 1, wherein: An annular baffle extending inward is provided at one end of the drum where the feeding port is located; A closing assembly is provided at one end close to the discharging port of the drum, and the closing assembly can block the discharging port of the drum.

5. The sample mixing device for coal quality detection according to claim 4, characterized in that, The closing assembly includes: A cover plate, capable of covering the discharging port of the drum; A telescopic member, arranged on the frame, the telescopic end of which is connected to the cover plate and used for driving the cover plate to approach or move away from the discharging port of the drum.

6. A method for detecting the quality of coal, characterized in that, Including the following steps: Step S10, Allocating mixing sample weights. In the coal of the same batch, different train trips are allocated their corresponding mixing sample weights, and at least two mixing sample weights are allocated in the same batch; Step S20, Sample mixing. Sub-samples are extracted from each train trip according to the weights, and the sample mixing device according to any one of claims 1-5 is used for sufficient mixing, and a standard weight sample is retained after mixing; Step S30, Comparing results. The mixing results with different weights are compared. If the deviation exceeds the threshold value, it is determined that the coal quality fluctuation within the batch is abnormal; Step S40, Abnormality handling. The remaining train trip samples corresponding to the abnormal batch are extended for the retention period, and a supervision report is generated.

7. The method for detecting coal quality according to claim 6, wherein In step S10, the determination of the mixing sample weights includes the following two methods: Method 1: Allocating weights in equal proportion according to the train trip weights; Method 2: Allocating weights in any proportion.

8. The method for detecting coal quality according to claim 7, characterized in that, In the said step S30, the threshold value is 50 kcal. When the absolute value of the mixing calorific value deviation between Method 1 and Method 2 > 50 kcal, it is determined that the coal quality fluctuation within the batch is abnormal.

9. The method for detecting the quality of coal according to claim 6, wherein, The sample mixing in the said step S20 includes the following steps: S21, The adjusting assembly adjusts the included angle between the plate surfaces of all the material plates and the axis of the drum; S22, Coal samples are added into the drum from the feeding port, and the power assembly is started to drive the drum to rotate; S23, The cover plate of the closing assembly covers the discharging port of the drum; S24, The adjusting assembly adjusts the plate surfaces of all the material plates to be parallel to the axis of the drum. S25. After the drum rotates continuously for a certain period of time, open the cover plate of the sealing component and adjust the surfaces of all the material plates so that an angle is formed again between the surfaces and the axis of the drum; S26. Complete the mixing and discharge the materials.

10. The method for detecting coal quality according to claim 9, characterized in that, In step S21 and step S25, the angle between the surface of the material plate and the axis of the drum is 30° to 60°.

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