CN111298940B - Pre-gangue discharge process for coking coal as selected raw material coal and screening device thereof - Google Patents
Pre-gangue discharge process for coking coal as selected raw material coal and screening device thereof Download PDFInfo
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- CN111298940B CN111298940B CN202010190127.XA CN202010190127A CN111298940B CN 111298940 B CN111298940 B CN 111298940B CN 202010190127 A CN202010190127 A CN 202010190127A CN 111298940 B CN111298940 B CN 111298940B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
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Abstract
The invention discloses a pre-gangue discharge process for coking coal as a selected raw material coal and a screening device thereof, wherein the pre-gangue discharge process comprises the following steps: crushing, screening and grading, separating and discharging waste rock, treating undersize materials and discharging waste rock from a second-stage undersize material; the screening device comprises a first support frame, a polyurethane screen body is arranged on the first support frame, supporting legs distributed in an array mode are arranged below the first support frame, elastic parts distributed symmetrically are arranged on the supporting legs, a second support frame is arranged below the first support frame, and a first belt conveyor and a second belt conveyor are arranged on the second support frame. The gangue discharge process reduces ash content of mine raw coal, discharges partial gangue, reduces production pressure of a coking coal separation plant, saves transportation cost and secondary separation cost, and the screening device is skillfully provided with two sections of different screen holes, so that three materials with different grain sizes are classified by a single device, the layout height of a factory building is reduced, the capital investment is reduced, and the process flow is simplified.
Description
Technical Field
The invention relates to the field of coal mine production, in particular to a process for pre-discharging gangue from coking coal as a selected raw material coal and a screening device thereof.
Background
The resource endowment conditions of rich coal, poor oil and less gas determine that coal dominates in the primary energy production and consumption structure of China, wherein the reserve of scarce coking coal accounts for about 30 percent of the total amount of the coal, and the state puts forward the requirement of protective mining. In recent years, along with the improvement of the mining mechanization degree, the content of gangue in raw coal is higher and higher, the coal quality is poorer and worse, and in addition, the gangue is easy to be argillized, the washing cost of a coking coal separation plant and the treatment pressure of slime water are increased.
At present, the waste rock discharge before selection comprises the processes of checking manual selection, heavy medium waste rock selection and movable screen waste rock discharge. The operation environment of an inspection manual separation field is severe, only wood blocks, ironware and a small amount of large pieces of gangue can be separated, the efficiency is low, accurate separation cannot be realized, and the gangue is seriously brought with coal; the heavy-medium gangue selecting and movable-sieve gangue discharging process belongs to a wet-method coal separating process, the lower limit of the sorting is 25mm at the lowest, the sorting is influenced by the screening effect, fine-grain coal slime enters the gangue discharging process, a coal slime water treatment link is required to be added, the process configuration is complex, the coal slime is conveyed to a coal preparation plant to be sorted again to influence the unloading efficiency, hardened coal slime cannot be fully wetted, the sorting precision of the process is influenced, the process enters a clean coal product to cause the ash content of the clean coal to exceed the standard, and the treatment pressure of a subsequent coal slime flotation link and a coal slime water sedimentation process is increased.
Disclosure of Invention
The invention aims to provide a pre-gangue-discharging process for coking coal as a selected raw material coal and a screening device thereof, wherein the gangue-discharging process adopts dry separation equipment through image recognition or X-ray separation and a high-efficiency dry separation separator, coal slime is not generated in the process, and a gangue-discharged product is directly crushed or enters a crusher to be crushed and is mixed with undersize to enter a raw material coal bunker, so that the ash content of mine raw coal can be reduced, partial gangue is discharged, the production pressure of a coking coal preparation plant is reduced, and the transportation cost and the secondary separation cost are saved; the screening device is ingeniously provided with two sections of different screen holes, so that three materials with different grain sizes can be classified by a single device, the layout height of a factory building is reduced, the capital investment is reduced, and the process flow is simplified.
The purpose of the invention can be realized by the following technical scheme:
a pre-gangue discharge process for coking coal as a selected raw material coal comprises the following steps: crushing, screening and grading, separating and discharging gangue, treating undersize materials and discharging gangue through a second-stage undersize material, wherein the process comprises the following specific steps:
s1: crushing
The raw coal mined in the mine is transported into a double-geared roller crusher of the ground production system through a hoisting device, and the discharge granularity of the double-geared roller crusher is 100-300 mm.
S2: screening and grading
And (3) feeding the crushed raw coal into a screening and grading device, and carrying out sectional screening by the screening and grading device, wherein the size of a first section of sieve pore is 4.5-25mm, and the size of a second section of sieve pore is 25-50 mm.
S3: separating and discharging gangue
And (4) enabling the oversize large materials obtained in the step S2 to enter a vibrating distributor, enabling the materials to uniformly enter a feeding belt conveyor of an intelligent dry separation machine, tiling the materials on the belt conveyor without overlapping, distinguishing lump coal and gangue by an image recognition/X-ray recognition device, carrying out positioning calculation, striking the lump coal by using compressed air to enter a rear chute when the materials are conveyed to a machine head chute, and enabling the gangue to enter a front chute to realize separation of the coal and the gangue.
The separated lump coal enters a crusher, the crushed lump coal is transferred to a raw coal bin through a raw coal warehousing belt, large gangue enters a roller screen, the material below the roller screen enters a raw coal transportation belt and enters the raw coal bin, and the large gangue on the screen is transferred to the lump gangue bin through the gangue belt.
S4: and (3) undersize treatment:
feeding the material with the size of 0-25mm below the screen of the step S2 into a first coal feeding belt (6) and conveying the material to a raw coal bin; materials with the size of 25-50mm below the second-stage sieve enter the buffer bin through a second warehousing belt (7).
S5: and (3) discharging gangue from the second-stage undersize:
and (4) feeding the material with the size of 25-50mm below the screen in the step (S4) into a buffer bin, wherein the buffer bin is arranged to keep the material feeding amount of the high-efficiency dry separation separator uniform and stable, feeding the material into the high-efficiency dry separation separator through a coal feeder and a rubber belt conveyor, conveying the discharged gangue to a gangue bin through a gangue transfer belt, and mixing clean coal and the undersize material in the step (S4) to enter a raw coal bin.
Further, the grain size of the discharged material of the double-geared roller crusher in the S1 is 150 mm.
Further, the grain size of the discharged material of the double-geared roller crusher in the S1 is 200 mm.
Further, the coarse coal screened and classified in the S2 is crushed and classified to obtain a first-stage undersize material of 0-25mm, a second-stage undersize material of 25-50mm and a material on the screen of 50-300 mm.
Further, the size of a section of the screen hole of the screen classification in the S2 is 6 mm.
Further, the size of a section of the screen hole of the screen classification in the S2 is 13 mm.
Further, the size of the secondary screen hole of the screening classification in the S2 is 30 mm.
Further, the size of the secondary screen hole of the screening classification in the S2 is 40 mm.
The utility model provides a coking coal selects for raw materials coal screening plant, screening plant includes first support frame, first support frame includes the support frame main part, is equipped with first play hopper and second play hopper in the support frame main part, and the both sides of first play hopper in the support frame main part all are equipped with the spout, are equipped with the quad slit in the support frame main part, quad slit and spout vertical distribution.
The outer wall of support frame main part is equipped with the L type bracing piece that the array distributes, and the one end and the support frame main part fastening connection of L type bracing piece, the other end are equipped with the backup pad, are equipped with the strengthening rib of symmetric distribution between backup pad and the L type bracing piece, and the below of backup pad is equipped with the first elastic component connecting block of symmetric distribution, and the below of support frame main part is equipped with the connecting block of symmetric distribution, is equipped with the rotation connecting hole on the connecting block, and the whipping hammer block is located the.
The first support frame is provided with a polyurethane screen body, the polyurethane screen body comprises a frame body, a polyurethane screen plate is arranged in the frame body, the polyurethane screen plate comprises a first section of screen plate and a second section of screen plate, a discharge hole is formed in one side, close to the second section of screen plate, of the frame body, the size of a screen hole of the first section of screen plate is 0-25mm, and the size of a screen hole of the second section of screen plate is 25-50 mm.
The first discharge hopper is positioned under one section of sieve plate, the second discharge hopper is positioned under the two sections of sieve plates, and the polyurethane sieve body is inserted into the sliding groove in a clamping manner from the square hole.
Supporting legs distributed in an array mode are arranged below the first supporting frame, elastic pieces distributed symmetrically are arranged on the supporting legs, one end of each elastic piece is fixedly connected with the corresponding supporting leg, and the other end of each elastic piece is fixedly connected with the corresponding first elastic piece connecting block.
The utility model discloses a high-pressure pump, including first bracing piece, second bracing piece, the one end of first bracing piece is equipped with the second bracing piece, the second bracing piece includes the first bracing piece of symmetric distribution, be equipped with the head rod of array distribution between the first bracing piece, the one end of first bracing piece is equipped with the second bracing piece, the other end and the intermediate position of first bracing piece are equipped with the third bracing piece, be equipped with the second connecting rod between the third bracing piece, the second bracing piece includes the first shower of symmetric distribution, be equipped with first nozzle on the first shower, first shower is fixed on second bracing piece and third bracing piece, the one end of first shower is equipped with first connecting pipe, the first shower of symmetric distribution passes through first connecting pipe intercommunication, first connecting pipe and external high-pressure pump body intercommunication, first connecting pipe is located between second connecting rod and the head rod, be equipped with the valve body on the first connecting pipe.
The second support frame comprises second spray pipes which are symmetrically distributed, second nozzles are arranged on the second spray pipes, the second spray pipes are fixed on the third support rod, and a second connecting pipe is arranged between the first spray pipes and the second spray pipes.
The first warehousing belt and the second warehousing belt are arranged on the second support frame, the first warehousing belt is fixed on the first connecting rod, one end of the first warehousing belt is located below the first discharging hopper, the first nozzle is opposite to the first warehousing belt, the second warehousing belt is fixed on the second connecting rod, one end of the second warehousing belt is located below the second discharging hopper, and the second nozzle is opposite to the second warehousing belt.
The invention has the beneficial effects that:
1. the gangue discharge process adopts dry separation equipment through image recognition or X-ray separation and a high-efficiency dry separation separator, coal slime is not generated in the process, and the gangue discharged product is directly crushed or enters a crusher and is mixed with undersize to enter a raw material coal bunker, so that the ash content of mine raw coal can be reduced, part of gangue is discharged, the production pressure of a coking coal preparation plant is reduced, and the transportation cost and the secondary separation cost are saved;
2. the screening device of the invention skillfully arranges two sections of different screen holes, realizes the classification of three materials with different grain sizes by a single device, reduces the layout height of a factory building, reduces the capital investment and simplifies the process flow.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of the gangue discharge process of the invention;
FIG. 2 is a schematic view of the construction of the screening device of the present invention;
FIG. 3 is a schematic view of a first support frame of the present invention;
FIG. 4 is a schematic view of a polyurethane screen according to the present invention;
fig. 5 is a schematic structural view of a second support frame of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A pre-gangue discharge process for coking coal as a selected raw material coal comprises the following steps: crushing, screening and grading, separating and discharging gangue, treating undersize materials and discharging gangue through a second stage of undersize materials, as shown in figure 1, the process comprises the following specific steps:
s1: crushing
The raw coal mined from the mine is transported into a double-geared roller crusher of a ground production system through a hoisting device, and the discharge granularity of the double-geared roller crusher is 100 mm.
S2: screening and grading
And (3) feeding the crushed raw coal into a screening and grading device, and carrying out sectional screening by the screening and grading device, wherein the size of a first section of screen hole is 4.5mm, the size of a second section of screen hole is 25mm, and the crushed raw coal is subjected to crushing and grading to obtain a first section of undersize material of 0-4.5mm, a second section of undersize material of 4.5-25mm and an oversize material of 25-100 mm.
S3: separating and discharging gangue
And (4) enabling the oversize large materials obtained in the step S2 to enter a vibrating distributor, enabling the materials to uniformly enter a feeding belt conveyor of an intelligent dry separation machine, tiling the materials on the belt conveyor without overlapping, identifying lump coal and gangue through image recognition, carrying out positioning calculation, striking the lump coal by using compressed air to enter a rear chute when the materials are conveyed to a machine head chute, and enabling the gangue to enter a front chute to realize separation of the coal and the gangue.
The separated lump coal enters a crusher, and is transported to a raw coal bunker through a raw coal bunker belt after being crushed; the method is characterized in that large waste rocks enter a roller screen, the materials below the roller screen enter a raw coal bin through a raw coal conveying belt, the large waste rocks on the screen are conveyed to the large waste rock bin through a waste rock belt, the roller screen is arranged to achieve crushed coal recovery of large waste rock surface adhesion, and when raw coal moisture is high and screening classification efficiency is not high, fine-grained materials can be completely separated and recovered to enter a raw coal product.
S4: and (3) undersize treatment:
feeding the material with the size of 0-4.5mm below the screen of the first section obtained in the step S2 into a first coal feeding belt, and conveying the material to a raw coal bin; and 4.5-25mm materials below the second-stage sieve enter the buffer bin through a second warehousing belt.
S5: and (3) discharging gangue from the second-stage undersize:
and (4) feeding the material with the undersize of 4.5-25mm in the step (S4) into a buffer bin, wherein the buffer bin is arranged to keep the material feeding amount of the high-efficiency dry separation separator uniform and stable, feeding the material into the high-efficiency dry separation separator through a coal feeder and a rubber belt conveyor, conveying the discharged gangue to a gangue bin through a gangue transfer belt, and mixing clean coal with the undersize of the step (S4) to enter a raw coal bin.
Example 2
A pre-gangue discharge process for coking coal as a selected raw material coal comprises the following steps: crushing, screening and grading, separating and discharging gangue, treating undersize materials and discharging gangue through a second stage of undersize materials, as shown in figure 1, the process comprises the following specific steps:
s1: crushing
The raw coal mined from the mine is transported into a double-geared roller crusher of a ground production system through a hoisting device, and the grain size of the output of the double-geared roller crusher is 150 mm.
S2: screening and grading
And (3) feeding the crushed raw coal into a screening and grading device, and screening by the screening and grading device in a segmented manner, wherein the size of a first section of sieve hole is 6mm, the size of a second section of sieve hole is 30mm, and the crushed raw coal is subjected to crushing and grading to obtain a first section of undersize material of 0-6mm, a second section of undersize material of 6-30mm and an oversize material of 30-150 mm.
S3: separating and discharging gangue
And (4) enabling the oversize large materials obtained in the step S2 to enter a vibrating distributor, enabling the materials to uniformly enter a feeding belt conveyor of an intelligent dry separation machine, tiling the materials on the belt conveyor without overlapping, identifying lump coal and gangue by an X-ray identification device, performing positioning calculation, and when the materials are conveyed to a machine head chute, striking the lump coal by using compressed air to enter a rear chute, and enabling the gangue to enter a front chute, so that the coal and the gangue are separated.
The separated lump coal enters a crusher, and is transported to a raw coal bunker through a raw coal bunker belt after being crushed; the method is characterized in that large waste rocks enter a roller screen, the materials below the roller screen enter a raw coal bin through a raw coal conveying belt, the large waste rocks on the screen are conveyed to the large waste rock bin through a waste rock belt, the roller screen is arranged to achieve crushed coal recovery of large waste rock surface adhesion, and when raw coal moisture is high and screening classification efficiency is not high, fine-grained materials can be completely separated and recovered to enter a raw coal product.
S4: and (3) undersize treatment:
feeding the material with the size of 0-6mm below the screen of the step S2 into a first coal feeding belt, and conveying the material to a raw coal bin; and the materials with the diameter of 6-30mm below the second-stage sieve enter the buffer bin through a second warehousing belt.
S5: and (3) discharging gangue from the second-stage undersize:
feeding the material with the size of 6-30mm below the screen in the step S4 into a buffer bin, wherein the buffer bin is arranged to keep the feeding amount of the high-efficiency dry separation separator uniform and stable, feeding the material into the high-efficiency dry separation separator through a coal feeder and a rubber belt conveyor, conveying the discharged gangue to a gangue bin through a gangue transfer belt, mixing the clean coal with the undersize material in the step S4, and feeding the mixture into a raw coal bin
Example 3
A pre-gangue discharge process for coking coal as a selected raw material coal comprises the following steps: crushing, screening and grading, separating and discharging gangue, treating undersize materials and discharging gangue through a second stage of undersize materials, as shown in figure 1, the process comprises the following specific steps:
s1: crushing
The raw coal mined from the mine is transported into a double-geared roller crusher of a ground production system through a hoisting device, and the grain size of the output of the double-geared roller crusher is 200 mm.
S2: screening and grading
And (3) feeding the crushed raw coal into a screening and grading device, and screening by the screening and grading device in a segmented manner, wherein the size of a first section of sieve hole is 13mm, the size of a second section of sieve hole is 40mm, and the crushed raw coal is subjected to crushing and grading to obtain a first section of undersize material of 0-13mm, a second section of undersize material of 13-40mm and an oversize material of 40-200 mm.
S3: separating and discharging gangue
And (4) enabling the oversize large materials obtained in the step S2 to enter a vibrating distributor, enabling the materials to uniformly enter a feeding belt conveyor of an intelligent dry separation machine, tiling the materials on the belt conveyor without overlapping, identifying lump coal and gangue by an X-ray identification device, performing positioning calculation, and when the materials are conveyed to a machine head chute, striking the lump coal by using compressed air to enter a rear chute, and enabling the gangue to enter a front chute, so that the coal and the gangue are separated.
The separated lump coal enters a crusher, and is transported to a raw coal bunker through a raw coal bunker belt after being crushed; the method is characterized in that large waste rocks enter a roller screen, the materials below the roller screen enter a raw coal bin through a raw coal conveying belt, the large waste rocks on the screen are conveyed to the large waste rock bin through a waste rock belt, the roller screen is arranged to achieve crushed coal recovery of large waste rock surface adhesion, and when raw coal moisture is high and screening classification efficiency is not high, fine-grained materials can be completely separated and recovered to enter a raw coal product.
S4: and (3) undersize treatment:
feeding the material with the size of 0-13mm below the screen of the step S2 into a first coal feeding belt, and conveying the material to a raw coal bin; and the materials with the diameter of 13-40mm below the second-stage sieve enter the buffer bin through a second warehousing belt.
S5: and (3) discharging gangue from the second-stage undersize:
feeding the material with the undersize of 13-40mm obtained in the step S4 into a buffer bin, wherein the buffer bin is arranged to keep the feeding amount of the high-efficiency dry separation separator uniform and stable, feeding the material into the high-efficiency dry separation separator through a coal feeder and a rubber belt conveyor, conveying the discharged gangue to a gangue bin through a gangue transfer belt, mixing the clean coal with the undersize obtained in the step S4, and feeding the mixture into a raw coal bin
Example 4
A pre-gangue discharge process for coking coal as a selected raw material coal comprises the following steps: crushing, screening and grading, separating and discharging gangue, treating undersize materials and discharging gangue through a second stage of undersize materials, as shown in figure 1, the process comprises the following specific steps:
s1: crushing
The raw coal mined from the mine is transported into a double-geared roller crusher of a ground production system through a hoisting device, and the grain size of the output of the double-geared roller crusher is 300 mm.
S2: screening and grading
And (3) feeding the crushed raw coal into a screening and grading device, and screening by the screening and grading device in a segmented manner, wherein the size of a first section of sieve hole is 25mm, the size of a second section of sieve hole is 50mm, and the crushed raw coal is subjected to crushing and grading to obtain a first section of undersize material of 0-25mm, a second section of undersize material of 25-50mm and an oversize material of 50-300 mm.
S3: separating and discharging gangue
And (4) enabling the oversize large materials obtained in the step S2 to enter a vibrating distributor, enabling the materials to uniformly enter a feeding belt conveyor of an intelligent dry separation machine, tiling the materials on the belt conveyor without overlapping, identifying lump coal and gangue through image recognition, carrying out positioning calculation, striking the lump coal by using compressed air to enter a rear chute when the materials are conveyed to a machine head chute, and enabling the gangue to enter a front chute to realize separation of the coal and the gangue.
The separated lump coal enters a crusher, and is transported to a raw coal bunker through a raw coal bunker belt after being crushed; the method is characterized in that large waste rocks enter a roller screen, the materials below the roller screen enter a raw coal bin through a raw coal conveying belt, the large waste rocks on the screen are conveyed to the large waste rock bin through a waste rock belt, the roller screen is arranged to achieve crushed coal recovery of large waste rock surface adhesion, and when raw coal moisture is high and screening classification efficiency is not high, fine-grained materials can be completely separated and recovered to enter a raw coal product.
S4: and (3) undersize treatment:
feeding the material with the size of 0-25mm below the screen of the step S2 into a first coal feeding belt, and conveying the material to a raw coal bin; and the materials with the size of 25-50mm below the second-stage sieve enter the buffer bin through a second warehousing belt.
S5: and (3) discharging gangue from the second-stage undersize:
and (4) feeding the material with the size of 25-50mm below the screen in the step (S4) into a buffer bin, wherein the buffer bin is arranged to keep the material feeding amount of the high-efficiency dry separation separator uniform and stable, feeding the material into the high-efficiency dry separation separator through a coal feeder and a rubber belt conveyor, conveying the discharged gangue to a gangue bin through a gangue transfer belt, and mixing clean coal and the undersize material in the step (S4) to enter a raw coal bin.
The utility model provides a coking coal selects for raw materials coal screening plant, screening plant includes first support frame 1, as shown in figure 2, figure 3, first support frame 1 includes support frame main part 11, is equipped with first hopper 12 and second hopper 13 in the support frame main part 11, the both sides of first hopper 12 all are equipped with the spout 14 that the slope distributes, are equipped with quad slit 15 in the support frame main part 11, quad slit 15 and spout 14 vertical distribution.
The outer wall of support frame main part 11 is equipped with array distribution's L type bracing piece 16, the one end and the support frame main part 11 fastening connection of L type bracing piece 16, the other end is equipped with backup pad 17, be equipped with symmetric distribution's strengthening rib 171 between backup pad 17 and the L type bracing piece 16, the below of backup pad 17 is equipped with symmetric distribution's first elastic component connecting block 18, the below of support frame main part 11 is equipped with symmetric distribution's connecting block 19, be equipped with on the connecting block 19 and rotate connecting hole 191, the whipping hammer block is located and rotates the connecting hole 191 internal.
The first support frame 1 is provided with a polyurethane sieve body 2, as shown in fig. 4, the polyurethane sieve body 2 includes a frame body 21, a polyurethane sieve plate 23 is arranged in the frame body 21, the polyurethane sieve plate 23 includes a first section sieve plate 231 and a second section sieve plate 232, a discharge port 22 is arranged on one side of the frame body 21 close to the second section sieve plate 232, the size of the sieve hole of the first section sieve plate 231 is 0-13mm, and the size of the sieve hole of the second section sieve plate 232 is 13-50 mm.
Supporting legs 3 distributed in an array mode are arranged below the first supporting frame 1, elastic pieces 4 distributed symmetrically are arranged on the supporting legs 3, one ends of the elastic pieces 4 are fixedly connected with the supporting legs 3, and the other ends of the elastic pieces are fixedly connected with a first elastic piece connecting block 18.
A second support frame 5 is arranged below the first support frame 1, as shown in fig. 5, the second support frame 5 includes first support rods 51 distributed symmetrically, first connection rods 511 distributed in an array are arranged between the first support rods 51, a second support rod 52 is arranged at one end of each first support rod 51, third support rods 53 are arranged at the other end and the middle position of each first support rod 51, second connection rods 54 are arranged between the third support rods 53, the second support frame 5 includes first spray pipes 55 distributed symmetrically, first nozzles 551 are arranged on the first spray pipes 55, the first spray pipes 55 are fixed on the second support rods 52 and the third support rods 53, a first connection pipe 552 is arranged at one end of each first spray pipe 55, the first spray pipes 55 distributed symmetrically are communicated through the first connection pipe 552, the first connection pipe 552 is communicated with an external pump body at a high pressure, the first connection pipe 552 is located between the second connection rods 54 and the first connection rods 511, the first connection pipe 552 is provided with a valve body 8.
The second support frame 5 comprises second spray pipes 56 which are symmetrically distributed, a second nozzle 561 is arranged on the second spray pipe 56, the second spray pipe 56 is fixed on the third support rod 53, and a second connecting pipe 562 is arranged between the first spray pipe 55 and the second spray pipe 56.
A first warehousing belt 6 and a second warehousing belt 7 are arranged on the second support frame 5, the first warehousing belt 6 is fixed on the first connecting rod 511, one end of the first warehousing belt 6 is located below the first discharging hopper 12, the first nozzle 551 is over against the first warehousing belt 6, the second warehousing belt 7 is fixed on the second connecting rod 54, one end of the second warehousing belt 7 is located below the second discharging hopper 13, and the second nozzle 561 is over against the second warehousing belt 7.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (9)
1. The pre-gangue discharge process for the coking coal as the selected raw material coal is characterized by comprising the following steps of: crushing, screening and grading, separating and discharging gangue, treating undersize materials and discharging gangue through a two-stage undersize material, wherein the specific steps of the preliminary gangue discharge process are as follows:
s1: crushing
Conveying the raw coal mined from the mine into a double-geared roller crusher of a ground production system through a lifting device, wherein the grain size of the output material of the double-geared roller crusher is 100-300 mm;
s2: screening and grading
Feeding the crushed raw coal into a screening and grading device, and carrying out sectional screening by the screening and grading device, wherein the size of a first section of screen hole is 4.5-25mm, and the size of a second section of screen hole is 25-50 mm;
s3: separating and discharging gangue
The method comprises the following steps that large materials on the screen in the step S2 enter a vibrating distributor, then the materials uniformly enter a feeding belt conveyor of the intelligent dry separation machine, the materials are tiled on the belt and are not overlapped, lump coal and gangue are distinguished through an image recognition device or an X-ray recognition device, positioning calculation is carried out, when the materials are conveyed to a machine head chute, the lump coal is struck by compressed air to enable the lump coal to enter a rear chute, and the gangue enters a front chute to realize separation of the coal and the gangue;
the separated lump coal enters a crusher, the crushed lump coal is transferred to a raw coal bin through a raw coal warehousing belt, large pieces of gangue enter a roller screen, the undersize of the roller screen enters a raw coal conveying belt so as to enter the raw coal bin, and the large pieces of gangue on the screen are transferred to the lump gangue bin through a gangue belt;
s4: and (3) undersize treatment:
the first-stage undersize material obtained in the step S2 enters a first warehousing belt (6) and is conveyed to a raw coal bunker, and the second-stage undersize material enters a buffer bin through a second warehousing belt (7); the buffer bin is arranged to keep the feeding quantity of the high-efficiency dry separation separator uniform and stable;
s5: and (3) discharging gangue from the second-stage undersize: and (5) feeding the two-section undersize materials entering the buffer bin in the step S4 into the high-efficiency dry separation machine through a coal feeder and a rubber belt conveyor, conveying the discharged gangue to a gangue bin through a gangue transfer belt, mixing clean coal with the one-section undersize materials in the step S4, and entering a raw coal bin.
2. The process of claim 1, wherein the discharged material grain size of the double-geared roller crusher in the step S1 is 150 mm.
3. The process of claim 1, wherein the discharged material granularity of the double-geared roller crusher in the step S1 is 200 mm.
4. The process of claim 1, wherein the first-stage undersize material, the second-stage undersize material and the oversize material are obtained after the classification in the step S2.
5. The process of claim 1, wherein the size of the screen of the S2 is 6 mm.
6. The process of claim 1, wherein the size of the screen of the S2 is 13 mm.
7. The process of claim 1, wherein the size of the secondary screen holes of the screen classification in S2 is 30 mm.
8. The process of claim 1, wherein the size of the secondary screen holes of the screen classification in S2 is 40 mm.
9. The pre-gangue discharging process for coking coal selected as raw material coal according to any one of claims 1 to 8, wherein the screening and grading equipment comprises a first support frame (1), the first support frame (1) comprises a support frame main body (11), a first discharge hopper (12) and a second discharge hopper (13) are arranged in the support frame main body (11), sliding chutes (14) are arranged in the support frame main body (11) at two sides of the first discharge hopper (12), square holes (15) are arranged in the support frame main body (11), and the square holes (15) are vertically distributed with the sliding chutes (14);
the outer wall of the support frame main body (11) is provided with L-shaped support rods (16) distributed in an array mode, one ends of the L-shaped support rods (16) are fixedly connected with the support frame main body (11), the other ends of the L-shaped support rods (16) are provided with support plates (17), reinforcing ribs (171) distributed symmetrically are arranged between the support plates (17) and the L-shaped support rods (16), first elastic piece connecting blocks (18) distributed symmetrically are arranged below the support plates (17), connecting blocks (19) distributed symmetrically are arranged below the support frame main body (11), rotating connecting holes (191) are formed in the connecting blocks (19), and the swinging hammer body rotates in the rotating connecting holes (191;
the first support frame (1) is provided with a polyurethane sieve body (2), the polyurethane sieve body (2) comprises a frame body (21), a polyurethane sieve plate (23) is arranged in the frame body (21), the polyurethane sieve plate (23) comprises a first section of sieve plate (231) and a second section of sieve plate (232), a discharge hole (22) is formed in one side, close to the second section of sieve plate (232), of the frame body (21), the size of a first section of sieve hole of the first section of sieve plate (231) is 4.5-25mm, and the size of a second section of sieve hole of the second section of sieve plate (232) is 25-50 mm;
the first discharging hopper (12) is positioned right below the first section of sieve plate (231), the second discharging hopper (13) is positioned right below the second section of sieve plate (232), and the polyurethane sieve body (2) is inserted into and clamped in the sliding groove (14) from the square hole (15);
supporting feet (3) distributed in an array mode are arranged below the first supporting frame (1), elastic pieces (4) distributed symmetrically are arranged on the supporting feet (3), one end of each elastic piece (4) is fixedly connected with the corresponding supporting foot (3), and the other end of each elastic piece is fixedly connected with a first elastic piece connecting block (18);
a second support frame (5) is arranged below the first support frame (1), the second support frame (5) comprises first support rods (51) which are symmetrically distributed, first connecting rods (511) which are distributed in an array manner are arranged between the first support rods (51), one end of each first support rod (51) is provided with a second support rod (52), the other end and the middle position of each first support rod (51) are provided with third support rods (53), a second connecting rod (54) is arranged between the third support rods (53), the second support frame (5) comprises first spray pipes (55) which are symmetrically distributed, first spray pipes (55) are provided with first nozzles (551), the first spray pipes (55) are fixed on the second support rods (52) and the third support rods (53), one end of each first spray pipe (55) is provided with a first connecting pipe (552), the first spray pipes (55) which are symmetrically distributed are communicated through first connecting pipes (552), the first connecting pipe (552) is communicated with an external high-pressure pump body, the first connecting pipe (552) is positioned between the second connecting rod (54) and the first connecting rod (511), and a valve body (8) is arranged on the first connecting pipe (552);
the second support frame (5) comprises second spray pipes (56) which are symmetrically distributed, second nozzles (561) are arranged on the second spray pipes (56), the second spray pipes (56) are fixed on the third support rod (53), and second connecting pipes (562) are arranged between the first spray pipes (55) and the second spray pipes (56);
be equipped with first belt (6) of putting into storage and second belt (7) of putting into storage on second support frame (5), first belt (6) of putting into storage is fixed on head rod (511), the one end of first belt (6) of putting into storage is located the below of first play hopper (12), first nozzle (551) are just to first belt (6) of putting into storage, second belt (7) of putting into storage is fixed on second connecting rod (54), the one end of second belt (7) of putting into storage is located the below of second play hopper (13), second nozzle (561) are just to second belt (7) of putting into storage.
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| CN112871440A (en) * | 2021-01-12 | 2021-06-01 | 黑龙江龙煤双鸭山矿业有限责任公司 | Fusion process of coking coal preparation plant and power coal preparation plant |
| CN113210112A (en) * | 2021-05-07 | 2021-08-06 | 中煤科工清洁能源股份有限公司 | Coking coal blending system |
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| CN100460078C (en) * | 2007-05-18 | 2009-02-11 | 中国矿业大学 | Gangue separating method and device for mine |
| CN101596486A (en) * | 2009-06-26 | 2009-12-09 | 中国矿业大学 | Percussive bastard coal crushing and screening separation device |
| KR101136490B1 (en) * | 2009-10-13 | 2012-04-19 | 한국지질자원연구원 | Method for removing gangue minerals of coal by dry method |
| CN203291902U (en) * | 2013-05-30 | 2013-11-20 | 安徽理工大学 | Hydraulic crushing and screening device for underground coal and gangues |
| CN103639032A (en) * | 2013-12-25 | 2014-03-19 | 河南神火煤业公司刘河选煤厂 | Centralized large lump coal crushing process |
| CN107755283A (en) * | 2017-10-26 | 2018-03-06 | 天津美腾科技有限公司 | Underground coal mine dry separation waste rock discharge device and technique |
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