LU501107B1

LU501107B1 - Rotary Screening Type Coal Gangue Separation Device

Info

Publication number: LU501107B1
Application number: LU501107A
Authority: LU
Inventors: Xin Ma; Yongcun Guo; Shuang Wang; Xi Wang; Deyong Li; Lei He
Original assignee: Univ Anhui Sci & Technology
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-06-28

Abstract

The disclosure concerns a rotary screening type coal gangue separation device including a supporting base having a storage barrel fixedly arranged on the upper side; with a first rotary cylinder slidably mounted inside the storage barrel; a second sieving screen fixedly mounted at a lower end of the first rotary cylinder; a driving shaft fixedly mounted at a position of a circle center of the second sieving screen; a second rotary cylinder mounted inside the first rotary cylinder on an upper side of the second sieving screen; a first sieving screen fixedly mounted at a lower end of the second rotary cylinder; a second driving bevel gear fixedly mounted on the driving shaft inside a second device box; and a stirring frame fixedly connected to a position of a circle center of a side of the second driven bevel gear.

Description

DESCRIPTION Rotary Screening Type Coal Gangue Separation Device Technical Field

[0001] The disclosure herein relates to the field of coal gangue separation, in particular to a rotary screening type coal gangue separation device. Background

[0002] Coal gangue is solid waste discharged in the coal mining process and coal washing process, is a kind of black gray rock having a lower carbon content and being harder than coal, which is concomitant with coal seam in the coal forming process, and includes tunneled gangue during roadway tunneling, gangue excavated from roofs, floors and interlayers during mining, and washing gangue picked up during coal washing.

[0003] The coal gangue is in a large proportion in raw coal mined. Based on the rational utilization of resources, the coal gangue needs to be reused. The coal gangue is widely used, and can be used to manufacture building materials and chemical raw materials, generate power, etc. Because raw materials in a small volume need to be used for reusing the coal gangue, but raw coal gangue is relatively large in volume, the coal gangue needs to be screened again. Since the raw coal contains the coal gangue and coal which are mixed, generally, the coal will be separated from the coal gangue, and then the coal gangue will be screened many times, which will generate multiple processes and low efficiency. Moreover, an extremely large processing space is needed, and therefore, when it is applied to underground synchronous processing, the cost is large, and some stone particles with a similar diameter to the sieve hole are easily stuck inside the sieve hole, resulting in the blockage of the sieve hole, reducing the screening efficiency, and also causing damage to the sieve hole of the screen. Therefore, in summary, it is necessary to carry out relevant design on equipment. Summary

[0004] For the problem in the prior art, the present disclosure provides a rotary screening type coal gangue separation device.

[0005] According to the technical solution adopted by the present disclosure for solving the technical problems, a rotary screening type coal gangue separation device includes a supporting base; a storage barrel is fixedly arranged on an upper side of the supporting base; a first rotary cylinder is slidably mounted inside an upper end of the storage barrel; a second sieving screen is fixedly mounted at a lower end of the first rotary cylinder inside the storage barrel; a driving shaft is fixedly mounted at a position of a circle center of the second sieving screen; a second rotary cylinder is mounted inside the first rotary cylinder on an upper side of the second sieving screen; a first sieving screen is fixedly mounted at a lower end of the second rotary cylinder, and the second sieving screen is mounted in contact with the first sieving screen; the driving shaft is slidably mounted inside the first sieving screen; a first device box is fixedly arranged inside the second rotary cylinder on an upper side of the first sieving screen, and the driving shaft is slidably mounted inside the first device box; a first driving bevel gear is fixedly mounted on the driving shaft inside the first device box; a first driven bevel gear is mounted inside the first device box on a lower side of the first driving bevel gear; the first driven bevel gear is slidably mounted on the driving shaft, and a lower end of the first driven bevel gear is fixedly connected to the first sieving screen; a second device box is mounted on the driving shaft on an upper side of the first device box; a second driving bevel gear is fixedly mounted on the driving shaft inside the second device box; a second driven bevel gear is engaged with each of left and right ends of a lower side of the second driving bevel gear; a stirring frame is fixedly connected to a position of a circle center of a side of the second driven bevel gear away from the driving shaft; the other end of the stirring frame is fixedly connected to a material scraping plate, and the material scraping plate is mounted on an inner wall of the second rotary cylinder in contact; a plurality of sieving holes are uniformly arranged in a circumferential side of the second rotary cylinder; a plurality of cleaning brushes are fixedly mounted at a lower end of the second rotary cylinder between the first rotary cylinder and the second rotary cylinder, and the cleaning brush is mounted on an upper side of the second sieving screen in contact; and a motor is mounted at a lower end of the driving shaft.

[0006] Specifically, a pair of air cylinders are symmetrically and fixedly mounted on the upper side of the supporting base outside the storage barrel, an air rod is movably mounted at an upper end of the air cylinder, and the other end of the air rod is fixedly connected to the top cover.

[0007] Specifically, a first closing plate is rotatably mounted on a right side of the first rotary cylinder, and a second closing plate is rotatably mounted on a side on the sieving hole corresponding to the first closing plate; one side of the second closing plate close to the first closing plate is rotatably connected to a linkage rod, and the other end of the linkage rod is rotatably connected to the first closing plate; an upper end of the first closing plate is rotatably connected to a rotating frame; and a positioning rod is fixedly connected to a non-endpoint position of the rotating frame, and the positioning rod is rotatably mounted on the first rotary cylinder.

[0008] Specifically, a lower end of the top cover between the air cylinders is fixedly connected to a moving rod, a lower end of the moving rod is provided with a moving groove, the other end of the rotating frame is movably mounted inside the moving groove, and the other end of the rotating frame is fixedly connected to a spring; and the other end of the spring is fixedly connected to the supporting base.

[0009] Specifically, a rotary sleeve is rotatably mounted inside a lower side of the top cover, a rotary frame is fixedly mounted outside the rotary sleeve, a plurality of spray heads are uniformly mounted on the rotary frame, and the spray heads are connected to an external water delivery device; an upper end of the driving shaft is fixedly connected to the first rotary cylinder of the air cylinder, and the first rotary cylinder of the air cylinder can be fitted with the rotary sleeve for mounting.

[0010] Specifically, the first rotary cylinder and the second rotary cylinder can both be slidably mounted on the top cover, and a plurality of grinding teeth are uniformly arranged on an inner side wall of the first rotary cylinder so as to enhance the grinding strength between coal gangue.

[0011] The beneficial effects of the disclosure:

[0012] according to the rotary screening type coal gangue separation device described in the present disclosure, the first device box, the first driving bevel gear, a transmission bevel gear and the first driven bevel gear are used in combination, and the driving shaft drives the first driving bevel gear fixedly mounted to it under an action of the transmission bevel gear so that the first driving bevel gear and the first driven bevel gear rotate in opposite directions and the first rotary cylinder and the second rotary cylinder rotate in opposite directions, thereby not only enabling coal gangue to be separated according to different particle sizes via the first rotary cylinder, but also enabling the coal gangue separated out to be ground with each other so as to facilitate separation of pulverized coal on the coal gangue; and meanwhile the first sieving screen and the second sieving screen and the sieving holes are cleared to prevent the pulverized coal or the coal gangue from blocking them.

[0013] According to the rotary screening type coal gangue separation device described in the present disclosure, the second closing plate, the linkage rod, the first closing plate, the rotating frame, the positioning rod, the moving rod, the moving groove and the spring are used in cooperation so that the top cover drives the moving rod fixedly mounted to it to move up and down under an action of the air rod and the air cylinder, thereby enabling the rotating frame mounted in cooperation with the moving groove to rotate, and driving the first closing plate and the second closing plate to be synchronously opened and closed via the linkage rod, so as to collect the separated coal gangue. Brief Description of Figures

[0014] The disclosure herein is further described below in conjunction with drawings and examples.

[0015] FIG. 1is a schematic overall structural diagram of the present disclosure;

[0016] FIG. 2 is a schematic sectional-view structural diagram of a D-D portion in FIG. 1 of the present disclosure;

[0017] FIG. 3 is a schematic front view structural diagram in FIG. 1 of the present disclosure;

[0018] FIG. 4 is a schematic sectional-view structural diagram of an E-E portion in FIG. 1 of the present disclosure;

[0019] FIG. 5 is a schematic sectional-view structural diagram of an F-F portion in FIG. 1 of the present disclosure;

[0020] FIG. 6 is a schematic enlarged structural diagram of a D portion in FIG. D of the present disclosure;

[0021] FIG. 7 is a schematic enlarged structural diagram of an À portion in FIG. 2 of the present disclosure;

[0022] FIG. 8 is a schematic enlarged structural diagram of a B portion in FIG. 2 of the present disclosure; and

[0023] FIG. 9 is a schematic enlarged structural diagram of a C portion in FIG. 2 of the present disclosure.

[0024] In the figures: 1, top cover; 2, supporting base; 3, air cylinder; 4, air rod; 5, first rotary cylinder; 6, first closing plate; 7, rotating frame; 8, positioning rod; 9, moving rod; 10, moving groove; 11, motor; 12, spring; 13, storage barrel; 14, second rotary cylinder; 15, grinding teeth; 16, sieving hole; 17, cleaning brush; 18, first sieving screen; 19, stirring frame; 20, material scraping plate; 21, rotary frame; 22, spray head; 23, rotary sleeve; 24, driving shaft; 25, second closing plate; 26, linkage rod; 27, second sieving screen; 28, first device box; 29, first driving bevel gear; 30, transmission bevel gear; 31, first driven bevel gear; 32, second device box; 33, second driving bevel gear; 34, second driven bevel gear; 35, rotating shaft. Detailed Description

[0025] For easier understanding of the technical means, creative features and the achieved purposes and effects of the disclosure herein, the disclosure herein is further illustrated below in conjunction with examples.

[0026] As shown in FIG. 1 to FIG. 9, a rotary screening type coal gangue separation device described in the present disclosure, including a supporting base 2, a storage barrel 13 being fixedly arranged on an upper side of the supporting base 2; a first rotary cylinder 5 being slidably mounted inside an upper end of the storage barrel 13; a second sieving screen 27 being fixedly mounted at a lower end of the first rotary cylinder 5 inside the storage barrel 13; a driving shaft 24 being fixedly mounted at a position of a circle center of the second sieving screen 27; a second rotary cylinder 14 being mounted inside the first rotary cylinder 5 on an upper side of the second sieving screen 27; a first sieving screen 18 being fixedly mounted at a lower end of the second rotary cylinder 14, and the second sieving screen 27 being mounted in contact with the first sieving screen 18; the driving shaft 24 being slidably mounted inside the first sieving screen 18; a first device box 28 being fixedly arranged inside the second rotary cylinder 14 on an upper side of the first sieving screen 18, and the driving shaft 24 being slidably mounted inside the first device box 28; a first driving bevel gear 29 being fixedly mounted on the driving shaft 24 inside the first device box 28; a first driven bevel gear 31 being mounted inside the first device box 28 on a lower side of the first driving bevel gear 29; the first driven bevel gear 31 being slidably mounted on the driving shaft 24, and a lower end of the first driven bevel gear 31 being fixedly connected to the first sieving screen 18; a second device box 32 being mounted on the driving shaft 24 on an upper side of the first device box 28; a second driving bevel gear 33 being fixedly mounted on the driving shaft (24) inside the second device box 32; a second driven bevel gear 34 being engaged with each of left and right ends of a lower side of the second driving bevel gear 33; a stirring frame 19 being fixedly connected to a position of a circle center of a side of the second driven bevel gear 34 away from the driving shaft 24; the other end of the stirring frame 19 being fixedly connected to a material scraping plate 20, and the material scraping plate 20 being mounted on an inner wall of the second rotary cylinder 14 in contact; a plurality of sieving holes 16 being uniformly arranged in a circumferential side of the second rotary cylinder 14; a plurality of cleaning brushes 17 being fixedly mounted at a lower end of the second rotary cylinder 14 between the first rotary cylinder 5 and the second rotary cylinder 14, and the cleaning brush 17 being mounted on the upper side of the second sieving screen 27 in contact; and a motor 11 being mounted at a lower end of the driving shaft 24. Firstly, the driving shaft 24 drives the second sieving screen 27 fixedly mounted to it to rotate synchronously, and the second sieving screen 27 drives the first rotary cylinder 5 fixedly mounted to it to rotate on the storage barrel 13 in the same direction as the driving shaft 24. Secondly, the driving shaft 24 drives the first driving bevel gear 29 fixedly mounted to it to rotate, the first driving bevel gear 29 drives a transmission bevel gear 30 engaged with it to rotate, and the transmission bevel gear 30 drives the first driven bevel gear 31 engaged with it to rotate; the first driving bevel gear 29 enables the first driven bevel gear 31 to rotate in a direction opposite to the first driving bevel gear 29 via transmission of the transmission bevel gear 30, that is, the first driven bevel gear 31 and the driving shaft 24 rotate in opposite directions; the first driven bevel gear 31 drives the first sieving screen 18 fixedly mounted to it to rotate; the first sieving screen 18 drives the second rotary cylinder 14 fixedly mounted to it to rotate so that the second rotary cylinder 14 and the driving shaft 24 rotate in opposite directions.

Because the first rotary cylinder 5 and the driving shaft 24 rotate in the same direction, the first rotary cylinder 5 and the second rotary cylinder 14 rotate in opposite directions; for coal gangue raw materials inside the second rotary cylinder 14, coal gangue is subjected to a centrifugal rotary motion under a rotary action of the second rotary cylinder 14, so that smaller particles in the coal gangue flow out to an inside of the first rotary cylinder 5 through the sieving hole 16 in the second rotary cylinder 14, and the coal gangue is subjected to centrifugal rotary sieving according to the particle size.

At the same time, since the first rotary cylinder 5 and the second rotary cylinder 14 rotate in opposite directions, the coal gangue between the second rotary cylinder 14 and the first rotary cylinder 5 is subjected to self-friction, which facilitates comprehensive removal of pulverized coal on the coal gangue after centrifugal screening by friction.

Then the driving shaft 24 rotates to drive the second driving bevel gear 33 fixedly mounted to it to rotate, the second driving bevel gear 33 drives the second driven bevel gear 34 engaged with it to rotate, and the second driven bevel gear 34 drives the stirring frame 19 fixedly connected to the position of the circle center thereof to rotate, so that the stirring frame 19 overturns and stirs the coal gangue inside the second rotary cylinder 14 to facilitate sufficient washing of the coal gangue.

At the same time, the stirring frame 19 drives the material scraping plate 20 fixedly connected to it to rotate on the second rotary cylinder 14 for clearing to prevent that the coal gangue screened by centrifuging from blocks the sieving holes 16, which affects the working efficiency.

At the same time, the first sieving screen 18 and the second sieving screen 27 rotate in opposite directions to rub against each other, thereby preventing the scoured pulverized coal from blocking the first sieving screen 18 and the second sieving screen 27. The second rotary cylinder 14 drives the cleaning brush 17 fixedly mounted to it to rotate so as to prevent the pulverized coal between the second rotary cylinder 14 and the first rotary cylinder 5 from blocking the second sieving screen 27; the sieving efficiency of the first sieving screen 18 and the second sieving screen 27 is enhanced, and the scoured pulverized coal is collected inside the storage barrel 13.

[0027] Specifically, a pair of air cylinders 3 are symmetrically and fixedly mounted on the upper side of the supporting base 2 outside the storage barrel 13, an air rod 4 is movably mounted at an upper end of the air cylinder 3, and the other end of the air rod 4 is fixedly connected to the top cover 1. The air rod 4 is driven to extend and retract by the air cylinder 3, so that the top cover 1 moves up and down.

[0028] Specifically, a first closing plate 6 is rotatably mounted on a right side of the first rotary cylinder 5, and a second closing plate 25 is rotatably mounted on a side on the sieving hole 16 corresponding to the first closing plate 6; one side of the second closing plate 25 close to the first closing plate 6 is rotatably connected to a linkage rod 26, and the other end of the linkage rod 26 is rotatably connected to the first closing plate 6; and the second closing plate 25 and the first closing plate 6 can be synchronously opened and closed via the linkage rod 26. An upper end of the first closing plate 6 is rotatably connected to a rotating frame 7; and a positioning rod 8 is fixedly connected to a non-endpoint position of the rotating frame 7, and the positioning rod 8 is rotatably mounted on the first rotary cylinder 5. The rotating frame 7 rotates to drive the first closing plate 6 to be opened and closed.

[0029] Specifically, a lower end of the top cover 1 between the air cylinders 3 is fixedly connected to a moving rod 9, a lower end of the moving rod 9 is provided with a moving groove 10, the other end of the rotating frame 7 is movably mounted inside the moving groove 10, and the other end of the rotating frame 7 is fixedly connected to a spring 12; and the other end of the spring 12 is fixedly connected to the supporting base 2. The spring 12 not only limits and fixes the rotating frame 7 when the rotating frame 7 moves on the moving groove 10, but also helps the rotating frame 7 to reset by its own resilience.

[0030] Specifically, a rotary sleeve 23 is rotatably mounted inside a lower side of the top cover 1, a rotary frame 21 is fixedly mounted outside the rotary sleeve 23, a plurality of spray heads 22 are uniformly mounted on the rotary frame 21, and the spray heads 22 are connected to an external water delivery device; an upper end of the driving shaft 24 is fixedly connected to the rotating shaft 35, and the rotating shaft 35 and the rotary sleeve 23 are mounted in cooperation. The rotating shaft 35 and the rotary sleeve 23 are mounted in cooperation to achieve rotary spraying of the spray head 22.

[0031] Specifically, the first rotary cylinder 5 and the second rotary cylinder 14 can both be slidably mounted on the top cover 1, and a plurality of grinding teeth 15 are uniformly arranged on an inner side wall of the first rotary cylinder 5 so as to enhance the grinding strength between coal gangue.

[0032] According to the work principle, the air cylinder 3 is started, the air cylinder 3 drives the air rod 4 to stretch upwards by a certain distance for the first time, and the air rod 4 drives the top cover 1 fixedly connected to it to move upwards by a certain distance for the first time, so that the top cover 1 is away from the first rotary cylinder 5 and the second rotary cylinder 14, and the coal gangue can be conveniently poured into the second rotary cylinder 14. Meanwhile, the top cover 1 drives the moving rod 9 fixedly connected to it to move upwards in an upward moving process; in an upward moving process of the moving rod 9, the rotating frame 7 mounted in cooperation with the moving groove 10 in the moving rod 9 is enabled to move by a certain distance inside the moving groove 10, and the rotating frame 7 is kept not rotating in the upward moving process of the top cover 1, that is, the distance of first-time upward movement of the top cover 1 is equal to a length of the moving groove 10 to realize that in the first-time upward moving process of the top cover 1, the rotating frame 7 remains fixed. Secondly, after the coal gangue raw material is poured into the second rotary cylinder 14, the air cylinder 3 is started to drive the air rod 4 to move downwards, and the air rod 4 drives the top cover 1 to move downward, so that the top cover 1 covers an upper side of the first rotary cylinder 5 and the second rotary cylinder 14 for sealing. At this moment, the rotary sleeve 23 slidably mounted on the top cover 1 is mounted in cooperation with the first rotary cylinder 5 of the air cylinder 3, and the external water delivery device connected to the spray head 22 is started, so that the spray head 22 performs spray washing on the coal gangue raw material inside the second rotary cylinder 14 and the first rotary cylinder 5; then the motor 11 is started, the motor 11 drives the driving shaft 24 connected to it to rotate, the driving shaft 24 drives the second closing plate 25 fixedly connected to it to rotate, and the second closing plate 25 drives the rotary sleeve 23 mounted in cooperation with it to rotate, and the rotary sleeve 23 drives the spray head 22 to rotate and perform spraying through the rotary frame 21 fixedly mounted to it, so as to comprehensively and fully wash the raw material.

[0033] In a washing process, firstly, the driving shaft 24 drives the second sieving screen 27 fixedly mounted to it to rotate in the same direction; the second sieving screen 27 drives the first rotary cylinder 5 fixedly mounted to it to rotate on the storage barrel 13 in the same direction with the driving shaft 24. Secondly, the driving shaft 24 drives the first driving bevel gear 29 fixedly mounted to it to rotate; the first driving bevel gear 29 drives the transmission bevel gear 30 engaged with it to rotate, the transmission bevel gear 30 drives the first driven bevel gear 31 engaged with it to rotate, the first driving bevel gear 29 enables the first driven bevel gear 31 to rotate opposite to the first driving bevel gear 29 through transmission of the transmission bevel gear 30, that is, the first driven bevel gear 31 and the driving shaft 24 rotate in opposite direction; the first driven bevel gear 31 drives the first sieving screen 18 fixedly mounted to it to rotate, the first sieving screen 18 drives the second rotary cylinder 14 fixedly mounted to it to rotate, so that the second rotary cylinder 14 and the driving shaft 24 rotate in opposite directions.

Because the first rotary cylinder 5 and the driving shaft 24 rotate in the same direction, the first rotary cylinder 5 and the second rotary cylinder 14 rotate in opposite directions, for the coal gangue raw material inside the second rotary cylinder 14, the coal gangue is subjected to centrifugal rotary movement under the rotary action of the second rotary cylinder 14, thereby making smaller particles in the coal gangue flow out to an inside of the first rotary cylinder 5 through the sieving hole 16 in the second rotary cylinder 14, and the coal gangue is subjected to centrifuging rotary screening according to the particle size.

At the same time, because the first rotary cylinder 5 and the second rotary cylinder 14 rotate in opposite directions, self-friction is performed on the coal gangue between the second rotary cylinder 14 and the first rotary cylinder 5, which facilitates comprehensively removing the pulverized coal on the coal gangue after centrifugal screening by friction.

Then, the driving shaft 24 rotates to drive the second driving bevel gear 33 fixedly mounted to it to rotate, the second driving bevel gear 33 drives the second driven bevel gear 34 engaged with it to rotate, and the second driven bevel gear 34 drives the stirring frame 19 fixedly connected to the position of the circle center thereof to rotate, so that the stirring frame 19 overturns and stirs the coal gangue inside the second rotary cylinder 14 to facilitate sufficient washing of the coal gangue. At the same time, the stirring frame 19 drives the material scraping plate 20 fixedly connected to it to rotate on the second rotary cylinder 14 for clearing to prevent that the coal gangue screened by centrifuging blocks the sieving hole 16, which affects work efficiency. At the same time, the first sieving screen 18 and the second sieving screen 27 rotate in opposite directions to rub against each other, thereby preventing the scoured pulverized coal from blocking the first sieving screen 18 and the second sieving screen 27. The second rotary cylinder 14 drives the cleaning brush 17 fixedly mounted to it to rotate so as to prevent the pulverized coal between the second rotary cylinder 14 and the first rotary cylinder 5 from blocking the second sieving screen 27; the sieving efficiency of the first sieving screen 18 and the second sieving screen 27 is enhanced, and the scoured pulverized coal is collected inside the storage barrel 13.

[0034] After the separation work is over, the air cylinder 3 is started to drive the top cover 1 to move upwards for the second time through the air rod 4, a moving distance is greater than the first-time upward moving distance, that is, the second-time moving distance is greater than the length of the moving groove 10, so when the top cover 1 drives the moving rod 9 to move to the same distance as the first-time moving distance and then continues to move upward, the rotating frame 7 has moved to a bottom of the moving groove 10, and then the moving rod 9 continues to move and drives an end of the rotating frame 7 connected to it to rotate upwards, the spring 12 is stretched at the same time, so that the other end of the rotating frame 7 moves downwards, and then the first closing plate 6 connected to the other end of the rotating frame 7 rotates to a side away from the first rotary cylinder 5, that is, the first closing plate 6 is opened from the first rotary cylinder 5. At the same time, the first closing plate 6 drives the second closing plate 25 to rotate at the same time through the linkage rod 26, so that the second closing plate 25 and the first closing plate 6 are opened at the same time, which facilitates that the coal gangue inside the second rotary cylinder 14 and between the second rotary cylinder 14 and the first rotary cylinder 5 flows out.

[0035] The above shows and describes the basic principles, main features and advantages of the disclosure.

Those skilled in the art should understand that the disclosure is not limited by the foregoing examples.

The descriptions in the foregoing implementation modes and in the specification only illustrate the principles of the disclosure.

The disclosure may have various changes and improvements without departing from the spirit and scope of the disclosure, and these changes and improvements all fall within the scope claimed by the disclosure.

The scope claimed by the disclosure is defined by the appended claims and their equivalents.

Claims

Claims:

1. A rotary screening type coal gangue separation device, comprising a supporting base (2), a storage barrel (13) being fixedly arranged on an upper side of the supporting base (2); a first rotary cylinder (5) being slidably mounted inside an upper end of the storage barrel (13); a second sieving screen (27) being fixedly mounted at a lower end of the first rotary cylinder (5) inside the storage barrel (13); a driving shaft (24) being fixedly mounted at a position of a circle center of the second sieving screen (27); a second rotary cylinder (14) being mounted inside the first rotary cylinder (5) on an upper side of the second sieving screen (27); a first sieving screen (18) being fixedly mounted at a lower end of the second rotary cylinder (14), and the second sieving screen (27) being mounted in contact with the first sieving screen (18); the driving shaft (24) being slidably mounted inside the first sieving screen (18); a first device box (28) being fixedly arranged inside the second rotary cylinder (14) on an upper side of the first sieving screen (18), and the driving shaft (24) being slidably mounted inside the first device box (28); a first driving bevel gear (29) being fixedly mounted on the driving shaft (24) inside the first device box (28); a first driven bevel gear (31) being mounted inside the first device box (28) on a lower side of the first driving bevel gear (29); the first driven bevel gear (31) being slidably mounted on the driving shaft (24), and a lower end of the first driven bevel gear (31) being fixedly connected to the first sieving screen (18); a second device box (32) being mounted on the driving shaft (24) on an upper side of the first device box (28); a second driving bevel gear (33) being fixedly mounted on the driving shaft (24) inside the second device box (32); a second driven bevel gear (34) being engaged with each of left and right ends of a lower side of the second driving bevel gear (33); a stirring frame (19) being fixedly connected to a position of a circle center of a side of the second driven bevel gear (34) away from the driving shaft (24); the other end of the stirring frame (19) being fixedly connected to a material scraping plate (20), and the material scraping plate (20) being mounted on an inner wall of the second rotary cylinder (14) in contact; a plurality of sieving holes (16) being uniformly arranged in a circumferential side of the second rotary cylinder (14); a plurality of cleaning brushes (17) being fixedly mounted at a lower end of the second rotary cylinder (14) between the first rotary cylinder (5) and the second rotary cylinder (14), and the cleaning brush (17) being mounted on the upper side of the second sieving screen (27) in contact; and a motor (11) being mounted at a lower end of the driving shaft (24).

2. The rotary screening type coal gangue separation device according to claim 1, wherein a pair of air cylinders (3) are symmetrically and fixedly mounted on the upper side of the supporting base (2) outside the storage barrel (13), an air rod (4) is movably mounted at an upper end of the air cylinder (3), and the other end of the air rod (4) is fixedly connected to the top cover (1).

3. The rotary screening type coal gangue separation device according to claim 2, wherein a first closing plate (6) is rotatably mounted on a right side of the first rotary cylinder (5), and a second closing plate (25) is rotatably mounted on a side on the sieving hole (16) corresponding to the first closing plate (6); one side of the second closing plate (25) close to the first closing plate (6) is rotatably connected to a linkage rod (26), and the other end of the linkage rod (26) is rotatably connected to the first closing plate (6); an upper end of the first closing plate (6) is rotatably connected to a rotating frame (7); and a positioning rod (8) is fixedly connected to a non-endpoint position of the rotating frame (7), and the positioning rod (8) is rotatably mounted on the first rotary cylinder (5).

4, The rotary screening type coal gangue separation device according to claim 3, wherein a lower end of the top cover (1) between the air cylinders (3) is fixedly connected to a moving rod (9), a lower end of the moving rod (9) is provided with a moving groove (10), the other end of the rotating frame (7) is movably mounted inside the moving groove (10), and the other end of the rotating frame (7) is fixedly connected to a spring (12); and the other end of the spring (12) is fixedly connected to the supporting base (2).

5. The rotary screening type coal gangue separation device according to claim 4, wherein a rotary sleeve (23) is rotatably mounted inside a lower side of the top cover (1), a rotary frame (21) is fixedly mounted outside the rotary sleeve (23), a plurality of spray heads (22) are uniformly mounted on the rotary frame (21), and the spray heads (22) are connected to an external water delivery device; an upper end of the driving shaft (24) is fixedly connected to the first rotary cylinder (5) of the air cylinder (3), and the first rotary cylinder (5) of the air cylinder (3) can be fitted with the rotary sleeve (23) for mounting.

6. The rotary screening type coal gangue separation device according to claim 5, wherein the first rotary cylinder (5) and the second rotary cylinder (14) can both be slidably mounted on the top cover (1), and a plurality of grinding teeth (15) are uniformly arranged on an inner side wall of the first rotary cylinder (5) so as to enhance the grinding strength between coal gangue.