Coal slime separation and classification process and coal slime separation and classification machine

Abstract

The invention discloses a coal slime sorting and grading process and a coal slime sorting and grading machine, and relates to the technical field of coal slime sorting, the coal slime sorting and grading machine comprises a dilution assembly, a screen removing assembly and a spiral chute sorting assembly, and the dilution assembly is used for diluting a coal slime raw material; the screen removing assembly is used for conducting coarse screening on the diluted coal slurry; the spiral chute sorting assembly comprises a feeding barrel, a spiral chute sorting machine and a coal slurry tank, the screen removing assembly comprises a pumping assembly, the pumping assembly is used for pumping coal slurry subjected to coarse screening into the feeding barrel, and the feeding barrel is used for conveying the received coal slurry into the spiral chute sorting machine; the coal slime tanks are communicated with the output end of the spiral chute sorting machine through coal slime feeding pipes, and the number of the coal slime tanks is consistent with that of the coal slime feeding pipes; according to the coal slime sorting and grading machine, coal slime is diluted and screened to different degrees and then sorted, the coal slime sorting efficiency is improved, the follow-up coal slime flotation range is also reduced, and the coal slime grading and sorting efficiency and quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal slime sorting, and in particular relates to a coal slime sorting and grading process and a coal slime sorting and grading machine. Background Art

[0002] As we all know, the coal industry is the energy foundation supporting the rapid economic development of my country. my country is a major energy consumer, and coal has long occupied an absolute position in my country's energy consumption. Coal slime will be produced during coal mining, transportation and washing, and due to its low calorific value and high moisture content, direct use or combustion is not economical. Therefore, through coal slime sorting, the recovery rate of coal resources can be improved, fuel efficiency can be improved, and environmental pollution can be reduced.

[0003] The existing coal slime separation is mostly carried out by flotation machine, which directly puts large pieces of raw coal slime into the flotation machine, utilizes the interaction between coal slime particles and bubbles, and separates useful coal particles from impurity minerals in the coal slime through selective floating, thus achieving the flotation of coal particles. However, this method is not only inefficient but also wastes resources. Summary of the invention

[0004] The purpose of the present invention is to provide a coal slime sorting and grading process and a coal slime sorting and grading machine with a simple structure and reasonable design in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] In a first aspect, the present invention provides a coal slime sorting and classifying machine, comprising:

[0007] A dilution component, wherein the dilution component is used to dilute the coal slime raw material;

[0008] A screening component, the input end of which is connected to the output end of the dilution component, and the screening component is used for coarse screening of the diluted coal slurry;

[0009] A spiral chute sorting component, the spiral chute sorting component includes a feed barrel, a spiral chute sorting machine and a coal slime tank, the descreening component includes a pumping component, the pumping component is used to pump the coarsely screened coal slime into the feed barrel, the feed barrel is arranged at the upper end of the spiral chute sorting machine, the feed barrel is used to transport the received coal slime to the spiral chute sorting machine, the coal slime tank is connected to the output end of the spiral chute sorting machine through a coal slime feed pipe, wherein the number of the coal slime tanks is consistent with the number of the coal slime feed pipes.

[0010] As a further optimization scheme of the present invention, the dilution assembly includes a stirring bucket, a first dilution tank and a second dilution tank, the feeding end of the stirring bucket is connected to the first dilution tank, the first dilution tank and the second dilution tank are respectively arranged on one side of the stirring bucket, and the first dilution tank and the second dilution tank are connected, wherein a baffle is arranged at the connecting position of the first dilution tank and the second dilution tank, and the baffle is used to screen the coal slime particles smaller than the first target particle size;

[0011] The screening assembly is used to screen coal slime particles smaller than a second target particle size, wherein the second target particle size value is smaller than the first target particle size value.

[0012] As a further optimization scheme of the present invention, the second target particle size value ranges from 0.9 mm to 1.1 mm, and the first target particle size value ranges from 18 mm. 2 ~21mm 2 .

[0013] As a further optimization scheme of the present invention, there are multiple spiral chute separators, and the number of coal slime feeding pipes arranged on each spiral chute separator is the same, wherein the number of turns of the spiral chute in each spiral chute separator is 18 to 20.

[0014] As a further optimization scheme of the present invention, the pumping assembly includes a first conveying pump, a discharge pipe and a feed pipe. The first conveying pump is arranged on one side of the descreening assembly. The input end of the first conveying pump is connected to the output end of the screening hopper in the descreening assembly through the discharge pipe, and the output end of the first conveying pump is connected to the feed end of the feed barrel through the feed pipe.

[0015] As a further optimization scheme of the present invention, a slow flow component is arranged in the feed barrel, and the slow flow component includes an inner baffle and a guide cover. An outer baffle is fixedly arranged in the feed barrel, and the opening edge position of the outer baffle is rotatably connected to the inner baffle. A first spring is fixedly connected to the side of the inner baffle facing the outer baffle, and the other end of the first spring is fixedly connected to the outer baffle. A feed nozzle is arranged at one end of the feed pipe located in the feed barrel, and the guide cover is arranged at a position below the feed nozzle, and the spraying direction of the feed nozzle is arranged toward the conical surface of the guide cover, wherein the inner baffle is arranged near the discharge end of the feed barrel, and the inner baffle is arranged at an angle.

[0016] As a further optimization scheme of the present invention, the bottom of the inner wall of the feed barrel is fixedly connected to a limit seat, the outer end of the limit seat is slidably connected to the guide cover, a second spring is arranged between the guide cover and the limit seat, an abutment plate is fixedly arranged in the guide cover, one end of the abutment plate facing the limit seat is fixedly connected to a guide rod, a through hole is opened on the limit seat, the guide rod passes through the through hole to the lower end of the limit seat, the end of the guide rod away from the abutment plate is rotatably connected to a connecting rod, the other end of the connecting rod is rotatably connected to the slider, the outer end of the slider is fixedly connected to a push plate, the push plate is slidably fitted with the limit seat, wherein the push plate is arranged corresponding to the discharge end of the feed barrel.

[0017] As a further optimization scheme of the present invention, the number of discharge ends of the feed barrel is consistent with the number of spiral chute separators, wherein a liquid separation tube is fixedly provided at the discharge end of the feed barrel, and a feed separation barrel is provided at the feed end of the spiral chute separator, and the feed barrel transports the coal slurry to the feed separation barrel through the liquid separation tube.

[0018] In a second aspect, the present invention provides a coal slime sorting and grading process, using the above-mentioned coal slime sorting and grading machine, and the coal slime sorting and grading process steps include:

[0019] Step 1: diluting and screening the coal slurry water through a dilution component to obtain coal slurry water containing coal slurry particles smaller than a first target particle size;

[0020] Step 2: screening the coal slime water obtained in step 1 again by a screening component to obtain coal slime water containing coal slime particles smaller than a second target particle size, wherein the second target particle size value is smaller than the first target particle size value;

[0021] Step 3: conveying the coal slime water obtained in step 2 to a spiral chute separator through a feeding barrel for separation to obtain coal slime water containing target coal slime particles of different densities;

[0022] Step 4: The coal slime particles obtained in step 3 are floated and compressed by a flotation machine to obtain coal slime concentrate.

[0023] As a further optimization scheme of the present invention, in step three, the coal slurry water obtained in step two is transported through a feeding barrel to multiple spiral chute classifiers for sorting, and the coal slurry water containing target coal slurry particles of different densities obtained by sorting is respectively transported to coal slurry tanks through corresponding coal slurry feeding pipes, wherein the number of coal slurry tanks is consistent with the number of coal slurry feeding pipes.

[0024] The present invention has at least the following beneficial effects: the present invention provides a coal slime sorting and grading process and a coal slime sorting and grading machine, the coal slime sorting and grading machine comprises a dilution component, a screening component and a spiral chute sorting component, the raw coal slime is firstly crushed and diluted by the dilution component, and the coal slime particles with a particle size smaller than the first target particle size are screened out, and then the coal slime particles with a particle size smaller than the second target particle size are screened out by means of the screen in the screening component, thereby greatly reducing the sorting range and sorting work intensity of the spiral chute sorting coal slime particles;

[0025] Moreover, during sorting, by arranging a slow flow component in the feed barrel, with the help of the cooperation between the guide cover and the inner baffle, the coal slurry water can be effectively prevented from splashing outside the feed barrel, thereby reducing resource waste. When the guide cover is slowing down the flow, the push plate moves back and forth, prompting the coal slurry water to flow toward the discharge end, thereby improving the discharge efficiency of the coal slurry water. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 The present invention Figure 1 A schematic diagram of a partial side structure of

[0028] Figure 3 The present invention Figure 2 A schematic diagram of a partial cross-sectional structure;

[0029] Figure 4 It is a structural schematic diagram of the limit seat of the present invention;

[0030] Figure 5 It is a schematic diagram of the air deflector of the present invention and the structural components configured therein.

[0031] In the figure: 1, bracket; 2, stirring bucket; 3, first dilution tank; 4, second dilution tank; 5, descreening assembly; 6, discharge pipe; 7, first delivery pump; 8, feed pipe; 81, feed nozzle; 9, feed barrel; 10, liquid separation pipe; 11, feed separation barrel; 12, spiral chute separator; 13, coal slime tank; 14, second delivery pump; 15, outer baffle; 16, first spring; 17, inner baffle; 18, guide cover; 181, cone; 19, limit seat; 191, through hole; 20, push plate; 21, slider; 22, connecting rod; 23, guide rod; 24, second spring; 25, abutment plate. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0033] Example 1

[0034] like Figure 1 As shown, the present invention provides a coal slime sorting and classifying machine, comprising:

[0035] A dilution component, wherein the dilution component is used to dilute the coal slime raw material;

[0036] A screening component 5, the input end of which is connected to the output end of the dilution component, and the screening component 5 is used to perform a rough screening on the diluted coal slurry; the screening component 5 is arranged on the bracket 1, and can be detachably arranged on the bracket 1 for some equipment that needs a fixed working position;

[0037] The spiral chute sorting component includes a feed barrel 9, a spiral chute separator 12, and a coal slime tank 13. The descreening component 5 includes a pumping component, which is used to pump the coarsely screened coal slime into the feed barrel 9. The feed barrel 9 is arranged at the upper end of the spiral chute separator 12. The feed barrel 9 is used to transport the received coal slime to the spiral chute separator 12. The coal slime tank 13 is connected to the output end of the spiral chute separator 12 through a coal slime feed pipe, wherein the number of the coal slime tanks 13 is consistent with the number of the coal slime feed pipes.

[0038] In the above embodiment, the raw coal slime is subjected to different degrees of dilution and coarse screening, and the screened slime particles are further sorted, thereby ensuring that the range of slime objects for subsequent flotation is greatly reduced. Compared with the traditional method of directly flotating large pieces of raw coal slime on a flotation machine, the present application can greatly improve the efficiency of slime flotation, thereby increasing efficiency and production.

[0039] For example, see Figure 1 The dilution assembly includes a mixing bucket 2, a first dilution tank 3 and a second dilution tank 4, the feeding end of the mixing bucket 2 is connected to the first dilution tank 3, the first dilution tank 3 and the second dilution tank 4 are respectively arranged on one side of the mixing bucket 2, and the first dilution tank 3 and the second dilution tank 4 are connected, wherein a baffle is arranged at the connecting position of the first dilution tank 3 and the second dilution tank 4, and the baffle is used to screen the coal slime particles smaller than the first target particle size;

[0040] The screening assembly 5 is used to screen the coal slime particles smaller than the second target particle size, and the second target particle size value is smaller than the first target particle size value.

[0041] The raw coal sludge is crushed by the stirring bucket 2 and conveyed to the first dilution tank 3. The water in the water tank (not shown in the figure) is pumped into the first dilution tank 3 to dilute the raw coal sludge for the first time to form sludge water. As the liquid level in the first dilution tank 3 rises, the sludge water overflows from the first dilution tank 3 to the second dilution tank 4, wherein the sludge particles smaller than the first target particle size are blocked and filtered by the baffle net to pass through the gaps in the baffle net and enter the second dilution tank 4. As the water in the water tank is pumped into the second dilution tank 4 to further dilute the sludge water in the second dilution tank 4, the descreening component 5 is further screened to further obtain sludge particles with smaller particle sizes.

[0042] For example, the second target particle size ranges from 0.9 mm to 1.1 mm, and the first target particle size ranges from 18 mm. 2 ~21mm 2 For example, the first target particle size is 18 mm. 2 , 20mm 2 , 21mm 2 Preferably, the first target particle size is 20 mm. 2 , that is, set the gap size of the retaining net to 20mm 2 The purpose is to reduce the 2 The coal slime particles enter the second dilution tank 4; illustratively, the second target particle size value is 0.9mm, 1mm, 1.1mm, preferably, the second target particle size value is 1mm, illustratively, the sieve aperture in the descreening assembly 5 is set to 1mm, so that the coal slime particles larger than 1mm are vibrated out, and the coal slime particles smaller than 1mm pass through the sieve and enter the screening hopper below the sieve, thereby completing the coarse screening of the coal slime particles.

[0043] In other embodiments, three or more dilution tanks may be provided according to actual needs to grade and screen the coal slime particles.

[0044] For example, see Figure 1 There are multiple spiral chute separators 12, and the number of coal slime feeding pipes provided on each spiral chute separator 12 is the same, wherein the number of turns of the spiral chute in each spiral chute separator 12 is 18 to 20. The multiple spiral chute separators 12 simultaneously perform spiral chute separation to improve the separation efficiency of coal slime particles, and preferably, the number of turns of the spiral chute is set to 20, so that the coal slime has a more suitable motion trajectory in the chute, thereby improving the separation effect.

[0045] For example, Figure 1For example, the number of spiral chute separators 12 is four, and the number of coal slime feeding pipes arranged on each spiral chute separator 12 is the same. For example, each spiral chute separator 12 is respectively provided with two coal slime feeding pipes. The coal slime particles are stratified under the combined action of gravity, centrifugal force and water flow in the trough body. The coal slime particles with larger density tend to approach the inner wall of the trough body, move downward along the inner wall, and enter the coal slime feeding pipe arranged near the inner wall of the trough body, that is, the low-calorie coal slime feeding pipe, while the particles with smaller density are located in the upper layer, move along the outer side of the spiral chute, and enter the coal slime feeding pipe near the outer side, that is, the high-calorie coal slime feeding pipe. At this time, the number of coal slime tanks 13 is also two, one for collecting the low-calorie coal slime particles transported out by the four low-calorie coal slime feeding pipes, and the other for collecting the high-calorie coal slime particles transported out by the four high-calorie coal slime feeding pipes.

[0046] It should be noted that in order to help better stratify and separate coal slime particles of different densities, a wear-resistant and guiding material coating can be provided on the inner wall of the spiral chute. For example, the material coating is a polyurethane coating, a ceramic coating, a cemented carbide coating, etc., which is not limited here.

[0047] It should be noted that the classified and sorted coal slime water can be pumped to the next operation equipment of coal slime particles, such as a flotation machine and a compressor, through the second delivery pump 14 and the connected pipeline to obtain coal slime concentrate.

[0048] For example, see Figure 1 The pumping assembly includes a first delivery pump 7, a discharge pipe 6 and a feed pipe 8. The first delivery pump 7 is arranged on one side of the descreening assembly 5. The input end of the first delivery pump 7 is connected to the output end of the screen hopper in the descreening assembly 5 through the discharge pipe 6. The output end of the first delivery pump 7 is connected to the feed end of the feed barrel 9 through the feed pipe 8. The first delivery pump 7 delivers the coarsely screened coal slurry in the screen hopper to the feed barrel 9 through the discharge pipe 6 and the feed pipe 8 in sequence.

[0049] Example 2

[0050] Based on the above embodiments, continue to refer to Figure 1 and Figure 2The present invention further provides a slow flow component in the feed barrel 9, and the slow flow component includes an inner baffle 17 and a guide cover 18. An outer baffle 15 is fixedly provided in the feed barrel 9, and the opening edge of the outer baffle 15 is rotatably connected with the inner baffle 17. The inner baffle 17 is fixedly connected to the side of the outer baffle 15 facing the first spring 16, and the other end of the first spring 16 is fixedly connected to the outer baffle 15. A feed nozzle 81 is provided at one end of the feed pipe 8 located in the feed barrel 9, and the guide cover 18 is arranged at a position below the feed nozzle 81, and the spraying direction of the feed nozzle 81 is arranged toward the conical surface 181 of the guide cover 18, wherein the inner baffle 17 is arranged near the discharge end of the feed barrel 9, and the inner baffle 17 is inclined.

[0051] As a result, the coarsely screened coal slurry water delivered through the feed pipe 8 is rushed onto the conical surface 181 of the guide cover 18 through the feed nozzle 81. Due to the inclined setting of the conical surface 181, the coal slurry water is tiltedly splashed onto the inner baffle 17 and tiltedly guided to the discharge end of the feed barrel 9. Under the action of the splashing impact force, the first spring 16 undergoes elastic deformation, causing the inner baffle 17 to swing back and forth, thereby buffering the coal slurry water and effectively preventing the coal slurry water from splashing outside the feed barrel 9, thereby reducing resource waste.

[0052] For example, see Figure 3 , Figure 4 and Figure 5 The bottom of the inner wall of the feed barrel 9 is fixedly connected to a limit seat 19, and the outer end of the limit seat 19 is slidably connected to the air guide cover 18. A second spring 24 is arranged between the air guide cover 18 and the limit seat 19. An abutment plate 25 is fixedly arranged in the air guide cover 18, and one end of the abutment plate 25 facing the limit seat 19 is fixedly connected to a guide rod 23. A through hole 191 is opened on the limit seat 19, and the guide rod 23 passes through the through hole 191 to the lower end of the limit seat 19. The end of the guide rod 23 away from the abutment plate 25 is rotatably connected to a connecting rod 22, and the other end of the connecting rod 22 is rotatably connected to a slider 21. The outer end of the slider 21 is fixedly connected to a push plate 20, and the push plate 20 is slidably fitted with the limit seat 19, wherein the push plate 20 is arranged corresponding to the discharge end of the feed barrel 9.

[0053] After the deflector 18 is impacted by the coal slurry, the deflector 18 slides down, causing the abutment plate 25 to compress the second spring 24, thereby buffering the impact force on the deflector 18. At the same time, when the abutment plate 25 drives the guide rod 23 to move downward, the connecting rod 22 pushes the slider 21 outward, thereby realizing the outward movement of the push plate 20, and pushing the coal slurry water in front of the push plate 20 toward the discharge end of the feed barrel 9. Therefore, when the deflector 18 reciprocates up and down, the push plate 20 reciprocates, thereby pushing the coal slurry water, which helps the coal slurry water to be discharged from the discharge end of the feed barrel 9.

[0054] For example, Figure 1 and Figure 2 As shown, the number of the discharge ends of the feed barrel 9 is consistent with the number of the spiral chute separators 12, wherein the discharge end of the feed barrel 9 is fixedly provided with a liquid separation pipe 10, and the feed end of the spiral chute separator 12 is provided with a feed separation barrel 11, and the feed barrel 9 transports the coal slurry to the feed separation barrel 11 through the liquid separation pipe 10. Thus, the coal slurry water is evenly dispersed in multiple spiral chute separators 12.

[0055] Example 3

[0056] The present invention also provides a coal slime sorting and grading process, using the above-mentioned coal slime sorting and grading machine, the coal slime sorting and grading process steps include:

[0057] Step 1: diluting and screening the coal slurry water through a dilution component to obtain coal slurry water containing coal slurry particles smaller than a first target particle size;

[0058] Step 2: The coal slime water obtained in step 1 is screened again by the screening component 5 to obtain coal slime water containing coal slime particles smaller than a second target particle size, wherein the second target particle size value is smaller than the first target particle size value;

[0059] Step 3: The coal slime water obtained in step 2 is conveyed to the spiral chute separator 12 through the feeding barrel 9 for separation to obtain coal slime water containing target coal slime particles of different densities;

[0060] Step 4: The coal slime particles obtained in step 3 are floated and compressed by a flotation machine to obtain coal slime concentrate.

[0061] Through the above-mentioned coal slime sorting and grading process, the raw coal slime can be graded, screened and sorted to obtain coal slime particles of different densities and particle sizes, thereby greatly reducing the scope of the coal slime objects to be floated during the subsequent coal slime flotation. Compared with the traditional method of directly flotating large pieces of raw coal slime on a flotation machine, the present application can greatly improve the efficiency of coal slime flotation and increase efficiency and production.

[0062] For example, in step 3, the coal slime water obtained in step 2 is transported to multiple spiral chute separators 12 through a feed barrel 9 for sorting, and the coal slime water obtained by sorting and containing target coal slime particles of different densities is transported to coal slime tanks 13 through corresponding coal slime feed pipes, wherein the number of coal slime tanks 13 is consistent with the number of coal slime feed pipes, so as to improve the efficiency of coal slime sorting.

[0063] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A coal slime sorting and classifying machine, characterized in that: include: A dilution component, wherein the dilution component is used to dilute the coal slime raw material; A screening component (5), the input end of the screening component (5) is connected to the output end of the dilution component, and the screening component (5) is used to perform a coarse screening on the diluted coal slurry; A spiral chute sorting component, the spiral chute sorting component comprises a feed barrel (9), a spiral chute sorting machine (12) and a coal slime tank (13), the descreening component (5) comprises a pumping component, the pumping component is used to pump the coarsely screened coal slime into the feed barrel (9), the feed barrel (9) is arranged at the upper end of the spiral chute sorting machine (12), the feed barrel (9) is used to transport the received coal slime into the spiral chute sorting machine (12), the coal slime tank (13) is connected to the output end of the spiral chute sorting machine (12) through a coal slime feed pipe, wherein the number of the coal slime tanks (13) is consistent with the number of the coal slime feed pipes.

2. A coal slime sorting and classifying machine according to claim 1, characterized in that: The dilution assembly comprises a stirring bucket (2), a first dilution tank (3) and a second dilution tank (4); a feeding end of the stirring bucket (2) is connected to the first dilution tank (3); the first dilution tank (3) and the second dilution tank (4) are respectively arranged on one side of the stirring bucket (2), and the first dilution tank (3) and the second dilution tank (4) are connected; a baffle is arranged at the connecting position between the first dilution tank (3) and the second dilution tank (4), and the baffle is used to screen coal slime particles smaller than a first target particle size; The screening assembly (5) is used to screen coal slime particles smaller than a second target particle size, wherein the second target particle size value is smaller than the first target particle size value.

3. A coal slime sorting and classifying machine according to claim 2, characterized in that: The second target particle size value ranges from 0.9 mm to 1.1 mm, and the first target particle size value ranges from 18 mm. 2 ~21mm 2 .

4. A coal slime sorting and classifying machine according to claim 3, characterized in that: There are multiple spiral chute separators (12), and the number of coal slime feeding pipes arranged on each spiral chute separator (12) is the same, wherein the number of turns of the spiral chute in each spiral chute separator (12) is 18 to 20.

5. A coal slime sorting and classifying machine according to claim 4, characterized in that: The pumping assembly comprises a first delivery pump (7), a discharge pipe (6) and a feed pipe (8), wherein the first delivery pump (7) is arranged on one side of the descreening assembly (5), the input end of the first delivery pump (7) is connected to the output end of the screening hopper in the descreening assembly (5) through the discharge pipe (6), and the output end of the first delivery pump (7) is connected to the feed end of the feed barrel (9) through the feed pipe (8).

6. A coal slime sorting and classifying machine according to claim 5, characterized in that: A slow flow component is arranged in the feed barrel (9), and the slow flow component comprises an inner baffle (17) and a flow guide cover (18). An outer baffle (15) is fixedly arranged in the feed barrel (9), and the opening edge of the outer baffle (15) is rotatably connected to the inner baffle (17). A first spring (16) is fixedly connected to the side of the inner baffle (17) facing the outer baffle (15), and the other end of the first spring (16) is fixedly connected to the outer baffle (15). A feed nozzle (81) is arranged at one end of the feed pipe (8) located in the feed barrel (9), and the flow guide cover (18) is arranged below the feed nozzle (81). The spraying direction of the feed nozzle (81) is arranged toward the conical surface (181) of the flow guide cover (18), wherein the inner baffle (17) is arranged near the discharge end of the feed barrel (9), and the inner baffle (17) is arranged inclined.

7. A coal slime sorting and classifying machine according to claim 6, characterized in that: The bottom of the inner wall of the feeding barrel (9) is fixedly connected to a limit seat (19), the outer end of the limit seat (19) is slidably connected to the guide cover (18), a second spring (24) is arranged between the guide cover (18) and the limit seat (19), an abutment plate (25) is fixedly arranged in the guide cover (18), one end of the abutment plate (25) facing the limit seat (19) is fixedly connected to a guide rod (23), and a through hole (19) is opened on the limit seat (19). 1), the guide rod (23) passes through the through hole (191) to the lower end of the limit seat (19), one end of the guide rod (23) away from the abutment plate (25) is rotatably connected to a connecting rod (22), the other end of the connecting rod (22) is rotatably connected to a slider (21), the outer end of the slider (21) is fixedly connected to a push plate (20), the push plate (20) is slidably fitted with the limit seat (19), wherein the push plate (20) is arranged corresponding to the discharge end of the feed barrel (9).

8. A coal slime sorting and classifying machine according to claim 7, characterized in that: The number of the discharge ends of the feed barrel (9) is consistent with the number of the spiral chute separator (12), wherein a liquid separation pipe (10) is fixedly provided at the discharge end of the feed barrel (9), and a feed separation barrel (11) is provided at the feed end of the spiral chute separator (12), and the feed barrel (9) transports the coal slurry to the feed separation barrel (11) through the liquid separation pipe (10).

9. A coal slime sorting and grading process, characterized in that: A coal slime sorting and grading machine according to any one of claims 1 to 8 is used, wherein the coal slime sorting and grading process steps include: Step 1: diluting and screening the coal slurry water through a dilution component to obtain coal slurry water containing coal slurry particles smaller than a first target particle size; Step 2: screening the coal slime water obtained in step 1 again by a screening component (5) to obtain coal slime water containing coal slime particles smaller than a second target particle size, wherein the second target particle size value is smaller than the first target particle size value; Step 3: The coal slime water obtained in step 2 is conveyed to a spiral chute separator (12) through a feed barrel (9) for separation to obtain coal slime water containing target coal slime particles of different densities; Step 4: The coal slime particles obtained in step 3 are floated and compressed by a flotation machine to obtain coal slime concentrate.

10. A coal slime sorting and grading process according to claim 9, characterized in that: In step three, the coal slurry obtained in step two is transported through a feed barrel (9) to a plurality of spiral chute separators (12) for sorting, and the coal slurry water obtained by sorting and containing target coal slurry particles of different densities is transported to coal slurry tanks (13) through corresponding coal slurry feed pipes, wherein the number of coal slurry tanks (13) is consistent with the number of coal slurry feed pipes.

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