Fine multi-sampling division process for fire coal

Abstract

The invention provides a fire coal refining multiple sampling division process, and relates to the technical field of fire coal sampling. The method comprises a sampling and testing step and a sample mixing and testing step, wherein the sampling and testing step comprises the following steps: sampling points of a coal transport vehicle; the method comprises the following steps: crushing and dividing a sample twice, canning the sample, dividing the sample into at least three cans, conveying two cans to a sealing cover opening, code printing and code reading section, respectively loading the cans into a sample reserving box and a sample conveying box, and conveying the rest cans to external water detection; the sample sending box executes test operation and uploads test result data, and the sample reserving box stores the test result data; the sample mixing and testing step comprises the following steps: uncovering a sample reserving box on the current day and reading a code; transferring to a sample mixing section, and respectively sampling to automatic sample mixing equipment in proportion according to the sample feeding weight; after the samples are mixed, the canned samples are crushed and divided and then are loaded into two cans, one can of the samples is stored, the other can of the samples is conveyed to a test section to be tested, and test result data are uploaded. According to the method, the sample representativeness is improved, and the sample analysis result has credibility.

Description

Technical Field

[0001] The invention relates to the technical field of coal sampling, and in particular to a coal refined multiple sampling and reduction process. Background Art

[0002] A thermal power plant, also known as a thermal power plant, is a factory that uses combustibles (such as coal) as fuel to produce electricity. Currently, coal loaded and transported by vehicles must be sampled before entering the power plant, and then crushed, tested, assayed, and stored.

[0003] In the existing technology, coal sampling and subsequent inspection operations lack a complete process and method, which leads to not only chaotic sample management after sampling, but also low sample representativeness and the credibility of sample analysis results cannot be guaranteed. Summary of the invention

[0004] The purpose of the present invention is to develop a coal-fired refined multiple sampling and reduction process which can improve sample representativeness and make sample analysis results reliable.

[0005] The present invention is achieved through the following technical solutions: A coal-fired refined multiple sampling and fractionation process includes a sampling and testing step and a mixed sample testing step, wherein: The sampling and testing steps include: S1. In the sampling section, after the coal transport vehicle enters the station, sampling is carried out on the coal transport vehicle, and then the samples are canned and transported to the crushing and canning section; S2. In the crushing and canning section, the samples are crushed twice, reduced, and canned. Then the samples are divided into at least 3 cans, 2 of which are sent to the unsealing and coding section, and the rest are sent to the external water testing section; S3. In the unsealing and coding and reading process, the coding equipment can automatically label the two sample cans with electronic tags to store the data information of the sample cans. The capping equipment can automatically cap the sample cans to prevent the samples from spilling and becoming damp. The two cans of samples are respectively placed in the sample retention box and the sample delivery box; S4. The sample box is sent to the testing section, where the samples in the sample box are tested and the test results are uploaded, and the sample box is sent to the sample storage section for storage; The mixed sample assay step comprises: S①. Send the sample boxes of the day in the sample storage section to the unsealing and coding and reading section for unsealing and coding; S②. The sample tanks are transported to the mixing section, and samples are taken in proportion to the weight of the samples sent to the automatic mixing equipment, and mixing and canning are started; S③. The mixed and canned samples are sent to the crushing and canning section for crushing and reduction before being packed into two cans. The two cans of samples are sent to the capping and coding and reading section for capping and coding. One can of sample is sent by AGV to the sample storage section for storage. The other can of sample is transported to the testing section for testing and the test result data is uploaded.

[0006] Optionally, in step S2, the sample is crushed to a particle size of 13 mm in the first crushing and then reduced in size, and the sample is crushed to a particle size of 6 mm in the second crushing and then reduced in size and canned.

[0007] Optionally, in step S2, the external water detection section performs external water detection on the sample from the crushing and canning section, transfers the distillation pot to the turntable of the automatic detection equipment, transfers the sample to the distillation pot, transfers the empty can to the shelf, and the automatic detection equipment weighs it once before heating, and then starts heating, and weighs it again after heating for a specified time. The automatic detection equipment records the two weighing data and transmits them back to the system for storage, and the external water detection equipment transfers the tested distillation pot to the distillation pot shelf.

[0008] Optionally, in step S②, the mixed debris is directly conveyed to the debris barrel by the conveyor belt, and the excess retained samples are returned by the original route for coding and capping, and then sent to the retained sample storage section for storage.

[0009] Optionally, in step S3, the sample retention box and the sample delivery box are sent to the sample retention temporary storage section for cleaning; In the step S③, the two cans of samples are sent to the unsealing and coding and reading section for capping and coding, and then sent to the sample temporary storage section for cleaning.

[0010] Optionally, in step S③, the sample is manually crushed into 0.2 mm samples, and the 0.2 mm samples are weighed and canned, the number of cans is 2, one of which is filled with 100 g, and then tested and the test result data is uploaded, and the other can is filled with 700 g, which is then transported to the sample storage section for storage.

[0011] Optionally, the crusher includes a box body, in which a crushing roller is rotatably arranged, the interior of the box body and the crushing roller are in the shape of a truncated cone with the small diameter end facing downward, the angle between the generatrix of the crushing roller and the vertical direction is smaller than the angle between the generatrix inside the box body and the vertical direction, a reduction mechanism is provided at the bottom of the box body, a plurality of screens are provided in the box body, the mesh openings of the screens gradually decrease from top to bottom, a through hole is provided in the middle of the screen for the crushing roller to pass through, and a crushing mechanism is provided on the upper part of the screen.

[0012] Optionally, the crushing mechanism includes a plurality of crushing bevel teeth distributed on the inner wall of the box body, and multiple groups of crushing units arranged on the outer wall of the circumference of the crushing roller, the crushing unit includes a plurality of crushing components arranged at equal intervals along the generatrix of the crushing roller, the crushing component includes a crushing head, the crushing head is covered with a plurality of crushing ratchet teeth, the crushing heads of different crushing units have different spacings from the crushing roller, the crushing head is connected to a rotating rod, the rotating rod is rotatably connected to the crushing roller, the inner end of the rotating rod extends into the interior of the crushing roller, the inner end of the rotating rod is coaxially connected with a first bevel gear, the first bevel gears of the crushing components at the same height in different crushing units are on the same circular trajectory coaxial with the crushing roller, a support is rotatably provided at the bottom of the crushing roller, a plurality of support rods connected to the box body are provided on the side wall of the support, a pillar coaxial with the crushing roller is provided on the top of the support, and a plurality of second bevel gears meshing with the first bevel gears of crushing components of multiple different heights are coaxially provided at corresponding positions on the pillar.

[0013] Optionally, the outer diameter of the screen is larger than the inner diameter of the box at the corresponding position, and the inner wall of the box is provided with a circle of grooves for the edge of the screen to be inserted into, and the groove is provided with an elastic cushion layer that is sleeved on the edge of the screen, and the outer wall of the crushing roller on the inner side of the through hole is provided with two circles of grooves, and the two grooves are respectively located at the top and bottom of the screen, and rings are respectively rotatably provided in the two grooves, and flexible sealing layers are respectively provided between the two rings and the top edge and bottom edge of the through hole of the screen, and the distance between the inner wall of the through hole and the outer wall of the crushing roller varies in the circumferential direction of the crushing roller, and a spring telescopic rod is provided on the outer wall of the crushing roller between the two layers of the flexible sealing layers, and the end of the spring telescopic rod away from the crushing roller is provided with a universal ball that contacts the inner wall of the through hole.

[0014] Optionally, a discharge pipe is provided at the bottom of the box body, and the shrinking mechanism includes a guide block arranged directly below the discharge pipe, the guide block is conical with the cone facing upward, the guide block and the discharge pipe are coaxial, a collecting pipe is provided at the bottom of the guide block, a discharge pipe connected to the discharge pipe is provided above the guide block, a plurality of shrinking grooves are penetrated through the guide block, and the plurality of shrinking grooves are arranged at equal intervals in the circumferential direction of the guide block, a guide cover is provided on the top of the guide block, the guide cover is conical and matched with the guide block, and the guide cover is provided with shrinking holes corresponding to the shapes and positions of the plurality of shrinking grooves.

[0015] The beneficial effects of the present invention are: By establishing a sound process and method, sample management chaos is avoided, and the representativeness of samples after crushing, shrinking and mixing is greatly improved. The fairness of purchase and sale between coal supply and demand parties is effectively guaranteed, the rationality of power plant procurement costs is further guaranteed, the accuracy of sample information is guaranteed, the probability of artificial sample replacement and modification is greatly reduced, the sampling and processing operation specifications and test results are fair and reliable, and the credibility of sample analysis results is greatly improved. The test results need to be uploaded in time with picture proof to improve the security and credibility of the test data; The crusher achieves graded crushing, improving the crushing effect and uniformity. The screen used for graded crushing can vibrate laterally during crushing, so that materials with qualified particle sizes can quickly flow downward through the screen, improving crushing efficiency. The crushing head can rotate while swinging in a circle, improving the crushing efficiency and crushing effect of the material. A motor can drive the crushing head to rotate and rotate, simplifying the crusher structure, reducing the cost and weight of the crusher, and the reduction ratio can be quickly adjusted by rotating the material guide cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a process flow chart of the present invention; Figure 2 This is the structure diagram of the crusher; Figure 3 for Figure 2 Sectional view at point A; Figure 4 for Figure 2 Sectional view at point B; Figure 5 for Figure 2 Sectional view at point C in the middle; Figure 6 It is the structural diagram of the material guide block and the material guide cover; Figure 7 It is the structural diagram of the material guide cover; Figure 8 This is the structural diagram of the guide block.

[0018] Figure numerals: 1. Box body; 2. Feed hopper; 3. Crushing roller; 4. Crushing bevel teeth; 5. Screen; 6. Crushing head; 7. Rotating rod; 8. Support; 9. Discharge pipe; 10. Discharge pipe; 11. Material guide cover; 12. Collecting pipe; 13. Pillar; 14. Second bevel gear; 15. First bevel gear; 16. Slot; 17. Elastic cushion; 18. Ring; 19. Flexible sealing layer; 20. Through hole; 21. Universal ball; 22. Spring telescopic rod; 23. Material guide block; 24. Shrink hole; 25. Shrink groove. DETAILED DESCRIPTION

[0019] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation to the present invention.

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the present invention discloses a coal-fired refined multiple sampling and reduction process, including a sampling point section, a crushing and canning section, a cover unsealing and coding and reading section, an external water detection section, a sample temporary storage section, a sample storage section, a sample mixing section and a testing section.

[0023] The present invention includes a sampling and testing step and a mixed sample testing step, and the sampling and testing step includes: In the sampling section, after the coal transport vehicle enters the station, sampling is carried out on the coal transport vehicle, and then the samples are canned and transported to the exit by the circular conveyor line, and then transported to the crushing and canning section by the robot; In the crushing and canning section, the samples from the sampling section are first crushed, shrunk and canned using a 13mm crusher, and then transferred by a robot to a 6mm crusher for crushing, shrunk and canning. Finally, the 6mm samples are divided into 3 cans, 2 of which are sent to the unsealing and coding section, and the remaining 1 is sent to the external water testing section. The 2 cans of 6mm samples in the unsealing, coding and reading section can be automatically labeled with electronic tags by the coding equipment to store the data information of the sample cans. The capping equipment can automatically seal the sample cans to prevent the samples from spilling and becoming damp. The 2 cans of 6mm samples are respectively placed in the sample retention box and the sample delivery box; The sample boxes and sample delivery boxes are sent to the sample temporary storage section through the conveyor line. After the sample boxes and sample delivery boxes are cleaned, the sample delivery boxes are manually taken to the testing section. The samples in the sample delivery boxes are tested in the testing section, and the test result data is uploaded; The sample boxes are sent by AGV to the sample storage section for storage; The external water detection section conducts external water detection on one can sample from the crushing and canning section. The robot transfers the distilled pot to the turntable of the automatic detection equipment. The robot transfers the sample to the distilled pot and transfers the empty can to the shelf. The automatic detection equipment weighs it once before heating and then starts heating. After heating for a specified time, it weighs it again. The automatic detection equipment records the two weighing data and transmits them back to the system for storage. The external water detection equipment transfers the tested distilled pot to the distilled pot shelf.

[0024] The mixed sample test steps include: The AGV sends the sample boxes of the day in the sample storage section to the unsealing and coding and reading section for unsealing and coding. During this process, the sample cans are identified according to the storage information of the electronic tags of the sample cans to avoid taking the wrong samples. The sample cans are then transported to the mixing section by the track robot. The robot transfers the samples to be mixed to the mixing shelf. The robot receives the mixing instruction, takes the mixed samples from the mixing shelf and transfers them to the automatic mixing equipment. The automatic mixing equipment starts mixing and then filling the cans. During this process, samples are taken to the mixer in proportion to the weight of the samples sent. The mixed debris is directly transported to the debris barrel by the conveyor belt, and the excess sample is returned to the sample storage section by the original route. Among them, the AGV transfers the excess sample to the unsealing and coding and reading section, and after coding and capping, it is packed and sent to the sample storage section by the AGV for storage; The mixed and canned samples are sent to the crushing and canning section, where they are crushed and shrunk by a 3mm crusher before being canned. The number of cans is 2. The 2 cans of samples are sent to the unsealing and coding section. After capping and coding, they are sent to the temporary sample storage section. After the sample cans are cleaned in the temporary sample storage section, one can of sample is sent to the sample storage section by AGV for storage, and the other can of sample is transported to the testing section. In the testing section, the samples are manually crushed into 0.2 mm samples, and the 0.2 mm samples are weighed and canned. The number of cans is 2, one of which is filled with 100 g. After that, it is tested and the test result data is uploaded. The other can is filled with 700 g and then transported to the sample storage section for storage.

[0025] For the testing section, an online reporting system for test data is developed, and a real-time laboratory environment collection and monitoring system is established. The monitoring data can be used to reflect whether the environmental control of the test process meets the standards. A software function for electronic reporting of test data is provided, requiring identity login and uploading of test process picture attachments to ensure the credibility of the test process and results as much as possible, enhancing the authority control of the test database, and uploading local data to the central server in a timely manner if network conditions permit. The software system retains modification traces for all data modifications, including information such as the person who made the modification, the time of modification, the computer that made the modification, and the content of the modification, for later reference.

[0026] The structure of the above crusher is as follows Figures 2 to 8 As shown, it includes a box body 1, the inside of the box body 1 is in the shape of a truncated cone with the small diameter end facing downward, a crushing roller 3 is rotatably arranged in the box body 1, the crushing roller 3 is in the shape of a truncated cone with the small diameter end facing downward and is coaxial with the box body 1, and the angle between the generatrix of the crushing roller 3 and the vertical direction is smaller than the angle between the generatrix inside the box body 1 and the vertical direction, that is, from top to bottom, the distance between the crushing roller 3 and the inner wall of the box body 1 gradually decreases. A motor connected to the crushing roller 3 is provided at the top of the box body 1, and the motor drives the crushing roller 3 to rotate. A feed hopper 2 is also provided at the top of the box body 1, and the feed hopper 2 is connected to the cavity between the crushing roller 3 and the box body 1.

[0027] A support 8 is provided at the bottom of the crushing roller 3, and a plurality of support rods connected to the box body 1 are provided on the side wall of the support 8, and the support 8 is rotatably connected to the crushing roller 3. The bottom of the box body 1 below the support 8 is a contraction structure, and the bottom of the contraction structure is connected to a discharge pipe 9, and the bottom of the discharge pipe 9 is connected to a contraction mechanism.

[0028] Three screens 5 are arranged horizontally from top to bottom in the box 1, and the meshes of the screens 5 gradually decrease from top to bottom. The screens 5 are arranged horizontally, and the upper parts of the three screens 5 are all crushing chambers. The outer diameter of the screen 5 is larger than the inner diameter of the box 1 at the corresponding position. A circle of slots 16 for the edge of the screen 5 to be inserted is arranged on the inner wall of the box 1. The slot 16 is provided with an elastic cushion layer 17 sleeved on the edge of the screen 5, and the elastic cushion layer 17 can be rubber.

[0029] A through hole 20 for the crushing roller 3 to pass through is correspondingly provided at the center of the screen 5, and two circles of grooves are provided on the outer wall of the crushing roller 3 inside the through hole 20. The two circles of grooves are respectively located at the top and bottom of the screen 5. Rings 18 are respectively rotatably provided in the two grooves, and flexible sealing layers 19 are respectively provided between the two rings 18 and the top edge and the bottom edge of the through hole 20 of the screen 5. The flexible sealing layer 19 can be made of rubber material or a flexible membrane.

[0030] The distance between the inner wall of the through hole 20 and the outer wall of the crushing roller 3 varies in the circumferential direction of the crushing roller 3, that is, the through hole 20 is non-circular, or when the through hole 20 is circular, the through hole 20 and the crushing roller 3 are eccentrically arranged, and the center of the through hole 20 is not in the axial direction of the crushing roller 3. A spring telescopic rod 22 is arranged on the outer wall of the crushing roller 3 between the two rings 18, that is, between the two layers of flexible sealing layers 19. The spring telescopic rod 22 is arranged along the radial direction of the crushing roller 3, and a universal ball 21 is arranged at the end of the spring telescopic rod 22 away from the crushing roller 3, and the universal ball 21 contacts the inner wall of the through hole 20.

[0031] When the crushing roller 3 rotates, the spring telescopic rod 22 drives the universal ball 21 to roll on the inner wall of the through hole 20. Since the distance between the inner wall of the through hole 20 and the outer wall of the crushing roller 3 changes, the screen 5 vibrates laterally. The flexible sealing layer 19 seals the movement area of ​​the universal ball 21 to prevent materials from entering between the two flexible sealing layers 19.

[0032] A crushing mechanism is arranged in the crushing chamber above the screen 5. The crushing mechanism includes a plurality of crushing cone teeth 4 distributed on the inner wall of the box body 1. The crushing cone teeth 4 are cone-shaped and arranged obliquely downward, with the cone portion at the lower end.

[0033] The crushing mechanism also includes a plurality of crushing units arranged on the outer circumferential wall of the crushing roller 3, and the plurality of crushing units are arranged at equal intervals in the circumferential direction of the crushing roller 3. The crushing unit includes a plurality of crushing assemblies arranged at equal intervals along the generatrix of the crushing roller 3, and the crushing assembly includes a crushing head 6, which is covered with a plurality of crushing ratchets. The crushing heads 6 of different crushing units have different intervals with the crushing roller 3. The crushing head 6 is connected with a rotating rod 7, which is rotatably connected with the crushing roller 3, and the inner end of the rotating rod 7 extends into the interior of the crushing roller 3. The inner end of the rotating rod 7 is coaxially connected with a first bevel gear 15. In different crushing units, the first bevel gears 15 of the crushing assemblies at the same height are on the same circular trajectory coaxial with the crushing roller 3.

[0034] A support 13 is provided on the top of the support 8, which is coaxial with the crushing roller 3. A plurality of second bevel gears 14 meshing with the first bevel gears 15 of the crushing assemblies at different heights are coaxially provided at the corresponding positions on the support 13. When the motor drives the crushing roller 3 to rotate, the crushing roller 3 drives the plurality of crushing assemblies to rotate. In this process, the first bevel gear 15 rolls on the second bevel gear 14, so that the rotating rod 7 drives the crushing head 6 to rotate.

[0035] From top to bottom, the sizes of the crushing cone teeth 4 and the crushing ratchet teeth in the three crushing chambers gradually decrease and the density gradually increases.

[0036] The shrinking mechanism includes a guide block 23 arranged directly below the discharge pipe 9. The guide block 23 is conical with the conical part facing upward. The guide block 23 and the discharge pipe 9 are in a coaxial state. A collecting pipe 12 is provided at the bottom of the guide block 23, and a discharge pipe 10 connected to the discharge pipe 9 is provided above the guide block 23. The guide block 23 is inside the discharge pipe 10, and the discharge pipe 10 and the guide block 23 are in a coaxial state, and the top connected with the discharge pipe 9 is in a truncated cone shape.

[0037] The guide block 23 is provided with a plurality of contraction grooves 25 connected with the collecting pipe 12, and the plurality of contraction grooves 25 are arranged at equal intervals in the circumferential direction of the guide block 23. A guide cover 11 is sleeved on the top of the guide block 23, and the guide cover 11 is in a conical shape adapted to the guide block 23. The guide cover 11 is provided with contraction holes 24 corresponding to the shapes and positions of the plurality of contraction grooves 25. By rotating the guide cover 11, the overlapping area of ​​the contraction holes 24 and the contraction grooves 25 can be adjusted, thereby adjusting the opening of the contraction grooves 25 to adjust the contraction ratio.

[0038] The material falls from the discharge pipe 9 into the conical part of the guide cover 11 and then slides down along the side wall of the guide cover 11. During the sliding process, part of the material passes through the shrinking holes 24 and the shrinking grooves 25 and falls into the collecting pipe 12, while the other part slides down the guide cover 11 and falls into the discharge pipe 10.

[0039] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A coal-fired refined multiple sampling and reduction process, characterized in that: It includes sampling and testing steps and mixed sample testing steps, wherein: The sampling and testing steps include: S1. In the sampling section, after the coal transport vehicle enters the station, sampling is carried out on the coal transport vehicle, and then the samples are canned and transported to the crushing and canning section; S2. In the crushing and canning section, the samples are crushed twice, reduced, and canned. Then the samples are divided into at least 3 cans, 2 of which are sent to the unsealing and coding section, and the rest are sent to the external water testing section; S3. In the unsealing and coding and reading process, the coding equipment can automatically label the two sample cans with electronic tags to store the data information of the sample cans. The capping equipment can automatically cap the sample cans to prevent the samples from spilling and becoming damp. The two cans of samples are respectively placed in the sample retention box and the sample delivery box; S4. The sample box is sent to the testing section, where the samples in the sample box are tested and the test results are uploaded, and the sample box is sent to the sample storage section for storage; The mixed sample assay step comprises: S①. Send the sample boxes of the day in the sample storage section to the unsealing and coding and reading section for unsealing and coding; S②. The sample tanks are transported to the mixing section, and samples are taken in proportion to the weight of the samples sent to the automatic mixing equipment, and mixing and canning are started; S③. The mixed and canned samples are sent to the crushing and canning section for crushing and reduction before being packed into two cans. The two cans of samples are sent to the capping and coding and reading section for capping and coding. One can of sample is sent by AGV to the sample storage section for storage. The other can of sample is transported to the testing section for testing and the test result data is uploaded.

2. The coal-fired refined multiple sampling and reduction process according to claim 1 is characterized in that: In step S2, the sample is crushed into particles of 13 mm in size for the first time and then reduced in size, and the sample is crushed into particles of 6 mm in size for the second time and then reduced in size and canned.

3. The coal-fired refined multiple sampling and reduction process according to claim 1 is characterized in that: In step S2, the external water detection section performs external water detection on the sample from the crushing and canning section, transfers the distilled pot to the turntable of the automatic detection equipment, transfers the sample to the distilled pot, and transfers the empty can to the shelf. The automatic detection equipment weighs the weight once before heating, and then starts heating. After heating for a specified time, it weighs again. The automatic detection equipment records the two weighing data and transmits them back to the system for storage. The external water detection equipment transfers the tested distilled pot to the distilled pot shelf.

4. The coal-fired refined multiple sampling and reduction process according to claim 1 is characterized in that: In the step S②, the mixed debris is directly transported to the debris barrel by the conveyor belt, and the excess retained samples are returned by the original route for coding and capping, and then sent to the retained sample storage section for storage.

5. The coal-fired refined multiple sampling and reduction process according to claim 1 is characterized in that: In step S3, the sample retention box and the sample delivery box are sent to the sample temporary storage section for cleaning; In the step S③, the two cans of samples are sent to the unsealing and coding and reading section for capping and coding, and then sent to the sample temporary storage section for cleaning.

6. The coal-fired refined multiple sampling and reduction process according to claim 1 is characterized in that: In step S③, the sample is manually crushed into 0.2 mm samples, and the 0.2 mm samples are weighed and canned. The number of cans is 2, one of which is filled with 100 g, and then tested and the test result data is uploaded, and the other can is filled with 700 g, which is then transported to the sample storage section for storage.

7. The coal-fired refined multiple sampling and fractionation process according to any one of claims 1 to 6, characterized in that: Crushing and shrinking are carried out by a crusher, which includes a box body, in which a crushing roller is rotatably arranged, the interior of the box body and the crushing roller are in the shape of a truncated cone with the small diameter end facing downward, the angle between the generatrix of the crushing roller and the vertical direction is smaller than the angle between the generatrix inside the box body and the vertical direction, a shrinking mechanism is provided at the bottom of the box body, a plurality of screens are provided in the box body, the mesh openings of the screens gradually decrease from top to bottom, a through hole is provided in the middle of the screen for the crushing roller to pass through, and a crushing mechanism is provided on the upper part of the screen.

8. The coal-fired refined multiple sampling and reduction process according to claim 7 is characterized in that: The crushing mechanism includes a plurality of crushing bevel teeth distributed on the inner wall of the box body, and a plurality of crushing units arranged on the outer wall of the circumference of the crushing roller. The crushing unit includes a plurality of crushing components arranged at equal intervals along the generatrix of the crushing roller. The crushing component includes a crushing head, which is covered with a plurality of crushing ratchet teeth. The crushing heads of different crushing units have different intervals with the crushing roller. A rotating rod is connected to the crushing head, which is rotatably connected to the crushing roller. The inner end of the rotating rod extends into the crushing roller. The inner end of the rotating rod is coaxially connected with a first bevel gear. The first bevel gears of the crushing components at the same height in different crushing units are on the same circular trajectory coaxial with the crushing roller. A support is rotatably provided at the bottom of the crushing roller, and a plurality of support rods connected to the box body are provided on the side wall of the support. A pillar coaxial with the crushing roller is provided on the top of the support. A plurality of second bevel gears meshing with the first bevel gears of crushing components at different heights are coaxially provided at corresponding positions on the pillar.

9. The coal-fired refined multiple sampling and reduction process according to claim 7, characterized in that: The outer diameter of the screen is larger than the inner diameter of the box at the corresponding position; a circle of slots for the edge of the screen to be inserted is provided on the inner wall of the box; an elastic cushion layer is provided in the slot to be sleeved on the edge of the screen; two circles of grooves are provided on the outer wall of the crushing roller inside the through hole; the two grooves are respectively located at the top and bottom of the screen; sleeve rings are respectively rotatably provided in the two grooves; flexible sealing layers are respectively provided between the two sleeve rings and the top edge and the bottom edge of the through hole of the screen; the distance between the inner wall of the through hole and the outer wall of the crushing roller varies in the circumferential direction of the crushing roller; a spring telescopic rod is provided on the outer wall of the crushing roller between the two layers of the flexible sealing layers; a universal ball in contact with the inner wall of the through hole is provided at the end of the spring telescopic rod away from the crushing roller.

10. The coal-fired refined multiple sampling and reduction process according to claim 7, characterized in that: A discharge pipe is provided at the bottom of the box body, and the shrinking mechanism includes a guide block arranged directly below the discharge pipe, the guide block is conical with the cone facing upward, the guide block and the discharge pipe are in a coaxial state, a collecting pipe is provided at the bottom of the guide block, a discharge pipe connected with the discharge pipe is provided above the guide block, a plurality of shrinking grooves are penetrated through the guide block, and the plurality of shrinking grooves are arranged at equal intervals in the circumferential direction of the guide block, a guide cover is sleeved on the top of the guide block, the guide cover is conical and matched with the guide block, and the guide cover is provided with shrinking holes corresponding to the shapes and positions of the plurality of shrinking grooves.

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