Dry separation system

Abstract

The utility model relates to the technical field of raw coal separation, in particular to a dry separation system which comprises a first grading device, a first crushing device, a second grading device, a second crushing device, a TDS intelligent dry separation system and a TGS intelligent ladder flow dry separation system. The first grading equipment is matched with the first crushing equipment and the second grading equipment, so that raw coal conveyed at the upstream can be conveyed into the TDS intelligent dry separation system and the TGS intelligent ladder flow dry separation system; first middling coal and second middling coal discharged by the TDS intelligent dry separation system and the TGS intelligent ladder flow dry separation system are crushed by second crushing equipment and then conveyed to the TGS intelligent ladder flow dry separation system for further separation, so that the middling coal which cannot be treated by the TDS intelligent dry separation system can be treated, and the coal with small density and large granularity can be crushed into the granularity equal to that of gangue with large density; the problem that gangue with large density and small particle size and coal with small density and large particle size are difficult to separate in a TGS intelligent ladder flow dry separation system is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to raw coal sorting technical field, concretely relates to a dry sorting system. BACKGROUND

[0002] The dry sorting process of the combination of the TDS (intelligent dry separators) intelligent dry sorting system and the TGS (intelligent gradient fluidization dry separators) intelligent gradient fluidization dry sorting system has the characteristics of simple process, less installed equipment, no water and no medium consumption compared with the wet sorting, is suitable for the scenarios such as power coal gangue removal, coking coal pre-gangue removal, argillization coal sorting and gangue coal recovery, especially in arid water shortage area coal sorting.

[0003] In the easy coal sorting process, the dry sorting process of the combination of the TDS intelligent dry sorting system and the TGS intelligent gradient fluidization dry sorting system can fully recover high combustible coal, realizes the complete separation of coal and gangue, but when sorting the coal with gangue and high middling content raw coal, the TDS intelligent dry sorting system can only separate the fully dissociated coal and gangue, and cannot separate the coal and gangue in the coal with gangue, which affects the economic benefit, and when sorting the raw coal with high middling content or wide sorting particle size, the gangue with large density and small particle size and the coal with small density and large particle size are affected by the interference sedimentation and other sedimentation ratios, the two materials are located in the same layer, and the TGS intelligent gradient fluidization dry sorting system is difficult to separate due to the mutual embedding of the two materials in the sorting process.

[0004] Therefore, the utility model provides a dry sorting system, which realizes the complete separation of coal and gangue. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide a dry sorting system for raw coal sorting, which comprises a first grading device, a first crushing device, a second grading device, a second crushing device, a TDS intelligent dry sorting system and a TGS intelligent gradient fluidization dry sorting system.

[0006] The first grading device has a first outlet and a second outlet, and the particle size distribution of raw coal discharged from the first outlet and the second outlet gradually decreases; the feeding end of the first crushing device is communicated with the first outlet, and the first crushing device has a third outlet; the feeding end of the second grading device is communicated with the second outlet and the third outlet, and the second crushing device has a fourth outlet, a fifth outlet and a sixth outlet, and the particle size distribution of raw coal discharged from the fourth outlet, the fifth outlet and the sixth outlet gradually decreases; the feeding end of the TDS intelligent dry separation system is communicated with the fourth outlet, and the TDS intelligent dry separation system has a first clean coal outlet, a first middlings outlet and a first gangue outlet; the feeding end of the TGS intelligent gradient flow dry separation system is communicated with the fifth outlet, and the TGS intelligent gradient flow dry separation system has a second clean coal outlet, a second middlings outlet and a second gangue outlet; the feeding end of the second crushing device is communicated with the first middlings outlet and the second middlings outlet, and the second crushing device has a seventh outlet communicated with the feeding end of the TGS intelligent gradient flow dry separation system.

[0007] Further, the second grading device comprises a first screen assembly and a second screen assembly arranged in an upper and lower interval; the screening particle size of the first screen assembly is greater than the screening particle size of the second screen assembly.

[0008] Further, the screening particle size of the first screen assembly is 50mm, and the screening particle size of the second screen assembly is 3mm.

[0009] Further, the crushing particle size of the second crushing device is less than or equal to the screening particle size of the first screen assembly and greater than the screening particle size of the second screen assembly.

[0010] Further, the second crushing device comprises a first crusher and a second crusher arranged in sequence; the crushing particle size of the first crusher is 100mm, and the crushing particle size of the second crusher is 25mm.

[0011] Further, the seventh outlet is communicated with the feeding end of the second screen assembly.

[0012] Further, the crushing particle size of the first crushing device is less than or equal to the screening particle size of the first grading device.

[0013] Further, the screening particle size of the first grading device is 300mm.

[0014] Further, the dry separation system further comprises a pulverized coal bin; the sixth outlet is communicated with the pulverized coal bin.

[0015] Further, the TDS intelligent dry separation system is provided with a first filter cartridge dust collector; the TGS intelligent gradient flow dry separation system is provided with a second filter cartridge dust collector; the dust outlet of the first filter cartridge dust collector and the dust outlet of the second filter cartridge dust collector are communicated with the pulverized coal bin.

[0016] The dry separation system has the advantages that:

[0017] The dry separation system is used for separating raw coal, and comprises a first grading device, a first crushing device, a second grading device, a second crushing device, a TDS intelligent dry separation system and a TGS intelligent gradient flow dry separation system.

[0018] The working principle of the dry separation system is that the first grading device classifies the incoming material and obtains first raw coal and second raw coal with gradually reduced particle size intervals; the first raw coal is discharged from the first outlet to the first crushing device and is crushed into third raw coal; the second raw coal is discharged from the second outlet to the second grading device, and the third raw coal is discharged from the third outlet to the second grading device; the second grading device is used for classifying the mixed second raw coal and third raw coal and obtains fourth raw coal, fifth raw coal and sixth raw coal with gradually reduced particle size intervals; the fourth raw coal is discharged from the fourth outlet to the TDS intelligent dry separation system for separation and obtains first clean coal, first middlings and first gangue; the fifth raw coal is discharged from the fifth outlet to the TGS intelligent gradient flow dry separation system and obtains second clean coal, second middlings and second gangue; the first middlings are discharged from the first middlings outlet to the second crushing device, the second middlings are discharged from the second middlings outlet to the second crushing device, the second crushing device crushes the first middlings and the second middlings and obtains third middlings, and the third middlings are discharged from the seventh outlet to the TGS intelligent gradient flow dry separation system for further separation.

[0019] The first classifying device, the first crushing match and the second classifying device are matched, so that the raw coal conveyed upstream can be conveyed into the TDS intelligent dry separation system and the TGS intelligent gradient flow dry separation system; the first middlings and the second middlings separated by the TDS intelligent dry separation system and the TGS intelligent gradient flow dry separation system are mixed and conveyed into the TGS intelligent gradient flow dry separation system after being crushed by the second crushing device, compared with the prior art, the middlings that cannot be processed by the TDS intelligent dry separation system can be processed, the separation of coal and gangue is realized, and the coal with small density and large particle size can be crushed to the same particle size as the gangue with large density, so that the problem that the gangue with large density and small particle size and the coal with small density and large particle size are difficult to be layered and then separated in the TGS intelligent gradient flow dry separation system is solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 A process diagram of the dry separation system provided by the embodiments of the present application;

[0022] Figure 2 A structural diagram of the dry separation system provided by the embodiments of the present application.

[0023] Legend: 1-first classifying device; 11-first outlet; 12-second outlet; 2-first crushing device; 21-third outlet; 3-second classifying device; 31-first screen assembly; 32-second screen assembly; 33-fourth outlet; 34-fifth outlet; 35-sixth outlet; 4-TDS intelligent dry separation system; 41-TDS intelligent dry separator; 42-first vibrating distributor; 43-air compressor; 44-first filter cartridge dust collector; 45-first clean coal outlet; 46-first middlings outlet; 47-first gangue outlet; 5-TGS intelligent gradient flow dry separation system; 51-TGS intelligent gradient flow dry separator; 52-buffer bin; 53-second vibrating distributor; 54-second filter cartridge dust collector; 55-second clean coal outlet; 56-second middlings outlet; 57-second gangue outlet; 6-second crushing device; 61-first crusher; 62-second crusher; 63-seventh outlet. DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described clearly and completely below in connection with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0025] As shown in Figure 1 and Figure 2 An embodiment of the present application provides a dry sorting system for sorting raw coal, comprising: a first grading device 1, a first crushing device 2, a second grading device 3, a second crushing device 6, a TDS intelligent dry sorting system 4 and a TGS intelligent gradient flow dry sorting system 5; the first grading device 1 has a first outlet 11 and a second outlet 12, and the particle size distribution of the raw coal discharged from the first outlet 11 and the second outlet 12 gradually decreases; the feeding end of the first crushing device 2 is communicated with the first outlet 11, and the first crushing device 2 has a third outlet 21; the feeding end of the second grading device 3 is communicated with the second outlet 12 and the third outlet 21, the second crushing device 6 has a fourth outlet 33, a fifth outlet 34 and a sixth outlet 35, and the particle size distribution of the raw coal discharged from the fourth outlet 33, the fifth outlet 34 and the sixth outlet 35 gradually decreases; the feeding end of the TDS intelligent dry sorting system 4 is communicated with the fourth outlet 33, and the TDS intelligent dry sorting system 4 has a first clean coal outlet 45, a first middlings outlet 46 and a first gangue outlet 47; the feeding end of the TGS intelligent gradient flow dry sorting system 5 is communicated with the fifth outlet 34, and the TGS intelligent gradient flow dry sorting system 5 has a second clean coal outlet 55, a second middlings outlet 56 and a second gangue outlet 57; the feeding end of the second crushing device 6 is communicated with the first middlings outlet 46 and the second middlings outlet 56, and the second crushing device 6 has a seventh outlet 63, which is communicated with the feeding end of the TGS intelligent gradient flow dry sorting system 5.

[0026] The dry separation system provided by the embodiment is used for separation of raw coal. The raw coal conveyed by the upstream equipment is first conveyed to the first grading device 1. The first grading device 1 grades the raw coal conveyed by the upstream equipment and obtains first raw coal and second raw coal. The particle size distribution of the first raw coal is larger than that of the second raw coal. The first raw coal is discharged from the first grading device 1 through the first outlet 11. The second raw coal is discharged from the first grading device 1 through the second outlet 12. After the first raw coal is discharged from the first grading device 1 through the first outlet 11, the first raw coal is conveyed to the first crushing device 2 for crushing and obtaining third raw coal. The third raw coal is discharged from the first crushing device 2 through the third outlet 21. After the second raw coal is discharged from the first grading device 1 through the second outlet 12, the second raw coal is mixed with the third raw coal discharged from the first crushing device 2 through the third outlet 21 and is conveyed to the second grading device 3 for further grading treatment. The second grading device 3 further grades the mixed second raw coal and third raw coal to obtain fourth raw coal, fifth raw coal and sixth raw coal. The particle size distribution of the fourth raw coal, the fifth raw coal and the sixth raw coal gradually decreases. The sixth raw coal is pulverized coal. The fourth raw coal is discharged from the second grading device 3 through the fourth outlet 33. The fifth raw coal is discharged from the second grading device 3 through the fifth outlet 34. The sixth raw coal is discharged from the second grading device 3 through the sixth outlet 35. After the fourth raw coal is discharged from the second grading device 3 through the fourth outlet 33, the fourth raw coal is conveyed to the TDS intelligent dry separation system 4 for dry separation. After the fourth raw coal is dry separated in the TDS intelligent dry separation system 4, the fourth raw coal obtains first clean coal, first medium coal and first gangue. The first clean coal is discharged from the TDS intelligent dry separation system 4 through the first clean coal outlet 45. The first medium coal is discharged from the TDS intelligent dry separation system 4 through the first clean coal outlet 45. The first gangue is discharged from the TDS intelligent dry separation system 4 through the first gangue outlet 47. After the fifth raw coal is discharged from the second grading device 3 through the fifth outlet 34, the fifth raw coal is conveyed to the TGS intelligent gradient flow dry separation system 5 for dry separation. After the fifth raw coal is dry separated in the TGS intelligent gradient flow dry separation system 5, the fifth raw coal obtains second clean coal, second medium coal and second gangue. The second clean coal is discharged from the TGS intelligent gradient flow dry separation system 5 through the second clean coal outlet 55. The second medium coal is discharged from the TGS intelligent gradient flow dry separation system 5 through the second clean coal outlet 55. The second gangue is discharged from the TGS intelligent gradient flow dry separation system 5 through the second gangue outlet 57. After the first medium coal is discharged from the TDS intelligent dry separation system 4 through the first medium coal outlet 46, the first medium coal is mixed with the second medium coal discharged from the TGS intelligent gradient flow dry separation system 5 through the second medium coal outlet 56 and is conveyed to the second crushing device 6. The second crushing device 6 crushes the mixed first medium coal and second medium coal and obtains third medium coal. The third medium coal is discharged from the second crushing device 6 through the seventh outlet 63 and is conveyed to the TGS intelligent gradient flow dry separation system 5 for further dry separation to obtain second clean coal, second medium coal and second gangue.

[0027] In the embodiment, in order to improve economic benefits, the first middlings discharged by the TDS intelligent dry separation system 4 and the second middlings discharged by the TGS intelligent gradient flow dry separation system 5 are further processed, and the second crushing device 6 crushes the first middlings discharged by the TDS intelligent dry separation system 4 and the second middlings discharged by the TGS intelligent gradient flow dry separation system 5. The first middlings discharged by the TDS intelligent dry separation system 4 have a large particle size distribution, and in order to meet the processing range of the TGS intelligent gradient flow dry separation system 5, the first middlings need to be crushed. After the second middlings discharged by the TGS intelligent gradient flow dry separation system 5 are processed by the second crushing device 6, the coal with small density and large particle size can be crushed to the same particle size as the gangue with large density, and the coal with small density and large particle size can be subsequently conveyed to the TGS intelligent gradient flow dry separation system 5 to solve the problem that the gangue with large density and small particle size and the coal with small density and large particle size are difficult to be layered and separated in the TGS intelligent gradient flow dry separation system 5. Similarly, after the first middlings discharged by the TDS intelligent dry separation system 4 are processed by the second crushing device 6, the problem that the gangue with large density and small particle size and the coal with small density and large particle size are difficult to be layered and separated in the TGS intelligent gradient flow dry separation system 5 can also be solved.

[0028] The dry separation system provided in the embodiment enables the raw coal conveyed upstream to be conveyed to the TDS intelligent dry separation system 4 and the TGS intelligent gradient flow dry separation system 5 through the first classification device 1, the first crushing device and the second classification device 3. After the first middlings and the second middlings separated by the TDS intelligent dry separation system 4 and the TGS intelligent gradient flow dry separation system 5 are mixed and crushed by the second crushing device 6, the first middlings and the second middlings are conveyed to the TGS intelligent gradient flow dry separation system 5. Compared with the prior art, the dry separation system can process the middlings that cannot be processed by the TDS intelligent dry separation system 4, realize the separation of coal and gangue, and crush the coal with small density and large particle size to the same particle size as the gangue with large density, thereby solving the problem that the gangue with large density and small particle size and the coal with small density and large particle size are difficult to be layered and separated in the TGS intelligent gradient flow dry separation system 5.

[0029] Optionally, in the embodiment, the first classifying device 1 can be a linear vibrating screen or the like. The first crushing device 2 and the second crushing device 6 can be a jaw crusher or a roller crusher or the like. The second classifying device 3 can be a double-layer linear vibrating screen or a compound screen or the like. The TDS intelligent dry separation system 4 comprises a TDS intelligent dry separator 41, a first vibrating distributor 42, an air compressor 43 and a first filter cartridge dust collector 44. The first vibrating distributor 42 is used to uniformly distribute the raw coal on the working surface of the TDS intelligent dry separator 41, so as to ensure the efficiency and accuracy of the separation process. The air compressor 43 provides compressed air for the TDS intelligent dry separator 41. The first filter cartridge dust collector 44 is used to collect and treat the dust generated during the operation of the TDS intelligent dry separator 41, so as to keep the working environment clean. The TGS intelligent gradient flow dry separation system 5 comprises a TGS intelligent gradient flow dry separator 51, a buffer bin 52, a second vibrating distributor 53 and a second filter cartridge dust collector 54. The buffer bin 52 is used to temporarily store the raw coal, so as to balance the feeding rate and the processing rate of the TGS intelligent gradient flow dry separator 51, and ensure the stable operation of the TGS intelligent gradient flow dry separator 51. The second vibrating distributor 53 is used to uniformly distribute the raw coal on the feeding port of the TGS intelligent gradient flow dry separator 51, so as to ensure the uniform distribution of the ore in the TGS intelligent gradient flow dry separator 51. The second filter cartridge dust collector 54 is used to collect and treat the dust generated during the operation of the TGS intelligent gradient flow dry separator 51, so as to keep the working environment clean.

[0030] The dry separation system provided by the embodiment of the utility model, as shown in Figure 1 and Figure 2 The second classifying device 3 comprises a first screen assembly 31 and a second screen assembly 32 which are arranged in an upper-lower interval. The screening particle size of the first screen assembly 31 is larger than that of the second screen assembly 32.

[0031] The second classifying device 3 comprises a first screen assembly 31 and a second screen assembly 32. The first screen assembly 31 is located above the second screen assembly 32. The second raw coal discharged by the first classifying device 1 and the third raw coal discharged by the first crushing device 2 are conveyed to the first screen assembly 31. The material on the screen of the first screen assembly 31 is the fourth raw coal, which is discharged from the fourth outlet 33. The material under the screen of the first screen assembly 31 enters the second screen assembly 32 for further classification. The material on the screen of the second screen assembly 32 is the fifth raw coal, which is discharged from the fifth outlet 34. The material under the screen of the second screen assembly 32 is the sixth raw coal, which is pulverized coal, and is discharged from the sixth outlet 35 to the pulverized coal bin.

[0032] The dry method sorting system provided by the embodiment of the utility model, the screening particle size of the first screen assembly 31 is 50mm, the screening particle size of the second screen assembly 32 is 3mm, that is, the particle size of the material screened by the first screen assembly 31 is greater than 50mm, the particle size of the material screened by the second screen assembly 32 is greater than 3mm and less than or equal to 50mm, and the particle size of the material screened under the second screen assembly 32 is less than or equal to 3mm, further, the screening particle size of the first grading device 1 is 300mm, that is, the particle size of the material screened by the first grading device 1 is greater than 300mm, and the particle size of the material screened under the first grading device 1 is less than or equal to 300mm, accordingly, the particle size of the material screened by the first screen assembly 31 is greater than 50mm and less than or equal to 300mm, that is, the particle size of the fourth raw coal is greater than 50mm and less than or equal to 300mm, the particle size of the fifth raw coal is greater than 3mm and less than or equal to 50mm, and the particle size of the sixth raw coal is less than or equal to 3mm, in the embodiment, the second screen assembly 32 is mainly used for screening out the raw coal with too small particle size, so as to avoid affecting the normal operation of the TGS intelligent cascade flow dry sorting system 5.

[0033] The dry method sorting system provided by the embodiment of the utility model, the crushing particle size of the second crushing device 6 is less than or equal to the screening particle size of the first screen assembly 31 and greater than the screening particle size of the second screen assembly 32, that is, after the first middlings and the second middlings are processed by the second crushing device 6, the particle size of the third middlings obtained is less than or equal to 50mm and greater than 3mm, so that the first middlings and the second middlings after crushing can meet the working requirements of the TGS intelligent cascade flow dry sorting system 5, further, since the crushing particle size of the second crushing device 6 is less than or equal to the screening particle size of the first screen assembly 31 and greater than the screening particle size of the second screen assembly 32, the third middlings discharged by the second crushing device 6 can be directly conveyed to the second screen assembly 32, so as to screen out the powdery material of the third middlings and avoid affecting the normal operation of the TGS intelligent cascade flow dry sorting system 5.

[0034] The dry method sorting system provided by the embodiment of the utility model, the second crushing device 6 comprises a first crusher 61 and a second crusher 62 arranged in sequence, the crushing particle size of the first crusher 61 is 100mm, and the crushing particle size of the second crusher 62 is 25mm.

[0035] In the embodiment, the second crushing device 6 comprises two crushers, the crushers can adopt the roller crusher or the jaw crusher and the like, the second crushing device 6 is provided with two crushers, so that the crushing efficiency can be improved, the product quality of the third middlings can be improved, and the maintenance cost can be reduced, the two crushers are the first crusher 61 and the second crusher 62, the first crusher 61 conveys the first middlings and the second middlings crushed to 100mm to the second crusher 62, and then the second crusher 62 crushes to 25mm.

[0036] The dry separation system provided by the embodiment of the utility model, preferably, the broken particle size of the first crushing equipment 2 is less than or equal to the screening particle size of the first grading equipment 1, so that the raw coal conveyed in the upstream can be conveyed into the subsequent TDS intelligent dry separation system 4 and TGS intelligent gradient flow dry separation system 5. Wherein, the screening particle size of the first grading equipment 1 is 300mm, that is, the particle size of the first raw coal is greater than 300mm, and the particle size of the second raw coal is less than or equal to 300mm; the first raw coal is crushed in the first crushing equipment 2 to obtain the third raw coal with the particle size less than or equal to 300mm.

[0037] The dry separation system provided by the embodiment of the utility model, preferably, the broken particle size of the first crushing equipment 2 is less than or equal to the screening particle size of the first grading equipment 1, so that the raw coal conveyed in the upstream can be conveyed into the subsequent TDS intelligent dry separation system 4 and TGS intelligent gradient flow dry separation system 5. Wherein, the screening particle size of the first grading equipment 1 is 300mm, that is, the particle size of the first raw coal is greater than 300mm, and the particle size of the second raw coal is less than or equal to 300mm; the first raw coal is crushed in the first crushing equipment 2 to obtain the third raw coal with the particle size less than or equal to 300mm. Figure 1 and Figure 2 As shown in the figure, the dry separation system further comprises a pulverized coal bin; the sixth raw coal discharged from the sixth outlet 35 is conveyed into the pulverized coal bin. Further, the TDS intelligent dry separation system 4 is provided with a first filter cartridge dust collector 44; the TGS intelligent gradient flow dry separation system 5 is provided with a second filter cartridge dust collector 54; the dust outlet of the first filter cartridge dust collector 44 and the dust outlet of the second filter cartridge dust collector 54 are both in communication with the pulverized coal bin, so as to recover the pulverized coal.

[0038] In the description of the utility model, it needs to be explained that the position or location relationship indicated by the terms "upper", "lower" and the like is the position or location relationship based on the position or location relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "installation", "communication", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be direct communication, or indirect communication through intermediate medium, or communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. In addition, in the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more.

[0040] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A dry separation system for separating raw coal, characterized in that, include: First grading equipment (1), first crushing equipment (2), second grading equipment (3), second crushing equipment (6), TDS intelligent dry separation system (4) and TGS intelligent cascade dry separation system (5); The first grading device (1) has a first outlet (11) and a second outlet (12), and the particle size distribution of the raw coal discharged from the first outlet (11) and the second outlet (12) gradually decreases; the feed end of the first crushing device (2) is connected to the first outlet (11), and the first crushing device (2) has a third outlet (21); the feed end of the second grading device (3) is connected to the second outlet (12) and the third outlet (21), and the second crushing device (6) has a fourth outlet (33), a fifth outlet (34) and a sixth outlet (35), and the particle size distribution of the raw coal discharged from the fourth outlet (33), the fifth outlet (34) and the sixth outlet (35) gradually decreases; the TDS intelligent dry separation The feed end of the system (4) is connected to the fourth outlet (33). The TDS intelligent dry separation system (4) has a first clean coal outlet (45), a first middlings coal outlet (46) and a first gangue outlet (47). The feed end of the TGS intelligent cascade dry separation system (5) is connected to the fifth outlet (34). The TGS intelligent cascade dry separation system (5) has a second clean coal outlet (55), a second middlings coal outlet (56) and a second gangue outlet (57). The feed end of the second crushing device (6) is connected to the first middlings coal outlet (46) and the second middlings coal outlet (56). The second crushing device (6) has a seventh outlet (63). The seventh outlet (63) is connected to the feed end of the TGS intelligent cascade dry separation system (5).

2. The dry sorting system according to claim 1, characterized in that, The second grading device (3) includes a primary screen assembly (31) and a secondary screen assembly (32) arranged at intervals; the screening particle size of the primary screen assembly (31) is larger than that of the secondary screen assembly (32).

3. The dry sorting system according to claim 2, characterized in that, The primary screen assembly (31) has a screening particle size of 50 mm, and the secondary screen assembly (32) has a screening particle size of 3 mm.

4. The dry sorting system according to claim 2, characterized in that, The crushing particle size of the second crushing device (6) is less than or equal to the screening particle size of the first-stage screen assembly (31) and greater than the screening particle size of the second-stage screen assembly (32).

5. The dry sorting system according to claim 4, characterized in that, The second crushing device (6) includes a first crusher (61) and a second crusher (62) arranged in sequence; the crushing particle size of the first crusher (61) is 100mm, and the crushing particle size of the second crusher (62) is 25mm.

6. The dry sorting system according to claim 4, characterized in that, The seventh outlet (63) is connected to the feed end of the secondary screen assembly (32).

7. The dry sorting system according to claim 1, characterized in that, The crushing particle size of the first crushing device (2) is less than or equal to the screening particle size of the first grading device (1).

8. The dry sorting system according to claim 1, characterized in that, The first grading device (1) has a screening particle size of 300 mm.

9. The dry sorting system according to claim 1, characterized in that, The dry sorting system also includes a pulverized coal silo; the sixth outlet (35) is connected to the pulverized coal silo.

10. The dry sorting system according to claim 9, characterized in that, The TDS intelligent dry separation system (4) is equipped with a first cartridge dust collector (44); the TGS intelligent cascade dry separation system (5) is equipped with a second cartridge dust collector (54); the dust outlet of the first cartridge dust collector (44) and the dust outlet of the second cartridge dust collector (54) are both connected to the pulverized coal silo.

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