CN115532580A

CN115532580A - Screening equipment and screening method for coal mining

Info

Publication number: CN115532580A
Application number: CN202211244516.1A
Authority: CN
Inventors: 郝宇; 张立辉; 赵利群
Original assignee: Chongqing Vocational Institute of Engineering
Current assignee: Chongqing Vocational Institute of Engineering
Priority date: 2022-10-12
Filing date: 2022-10-12
Publication date: 2022-12-30

Abstract

The invention discloses screening equipment and a screening method for coal mining, and belongs to the technical field of coal mine screening. Including first support frame, still include: the first support plate is fixedly connected to the side wall of the first support frame, the surface of the first support plate is fixedly connected with a feed plate, and the surface of the feed plate is provided with a feed chute; the first motor is fixedly connected to the side wall of the first supporting plate, and the output end of the first motor is fixedly connected with the second rotating rod; the coal screening device comprises a screening cylinder fixedly connected to the outer wall of a second rotating rod, a screening groove is formed in the surface of the screening cylinder, a material guide plate is fixedly connected to the surface of a first support frame, and a material discharge groove is formed in the surface of the material guide plate.

Description

Screening equipment and screening method for coal mining

Technical Field

The invention relates to the technical field of coal mine screening, in particular to screening equipment and a screening method for coal mining.

Background

Because of abundant coal resources in China, coal mining areas in China are more, the coal mining areas are generally divided into underground coal mines and open-pit coal mines, when a coal seam is far away from the ground, coal is generally mined into underground excavation roadways, when the coal seam is far away from the ground, the surface soil layer is generally directly stripped to excavate the coal, and the raw coal mined from the coal mines can be used for enterprises of coking or chemical engineering and the like through various processes of screening, impurity removal and the like.

The existing coal mine screening equipment mainly screens coal mine materials by utilizing the screen plate to pitch up and down, so that the coal mine materials on the upper surface of the screen plate can only pitch up and down in situ, the coal mine materials can stay in situ when pitching up and down, and cannot pass through the screen plate, so that the screening efficiency of the device is lower, and the effect is not ideal.

Disclosure of Invention

The invention aims to solve the problem that coal mine materials can stay in place when being overturned up and down and cannot pass through a screen plate in the prior art, so that the screening efficiency of the device is low, and provides screening equipment and a screening method for coal mining.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a screening installation for coal mining, includes first support frame, still includes: the first support plate is fixedly connected to the side wall of the first support frame, the surface of the first support plate is fixedly connected with a feed plate, and the surface of the feed plate is provided with a feed groove; the first motor is fixedly connected to the side wall of the first supporting plate, the output end of the first motor is fixedly connected with a second rotating rod, and the second rotating rod is rotatably connected with the first supporting frame; the screening drum is fixedly connected to the outer wall of the second rotating rod, a screening groove is formed in the surface of the screening drum, a material guide plate is fixedly connected to the surface of the first support frame, and a discharge groove is formed in the surface of the material guide plate.

For convenience of feeding, preferably, the inner wall of the feeding plate is rotatably connected with a first rotating rod, the outer wall of the first rotating rod is fixedly connected with a spiral plate, the first rotating rod is fixedly connected to the output end of the first motor, the second rotating rod is rotatably connected between the first supporting plate and the first supporting frame, and the first rotating rod is connected with the second rotating rod through a chain in a transmission manner.

In order to reduce the rolling of coal out of the feeding groove during feeding, a baffle is fixedly connected to the surface of the first supporting plate.

In order to facilitate the screening of coals with different sizes, preferably, the screening grooves include a first screening groove, a second screening groove and a fourth screening groove, the first screening groove, the second screening groove and the fourth screening groove are all rectangular, the width of the second screening groove is larger than that of the first screening groove, and the width of the fourth screening groove is larger than that of the second screening groove.

In order to improve the screening effect, the screening groove further comprises a third screening groove, the third screening groove is circular, and the third screening groove is located between the second screening groove and the fourth screening groove.

In order to guarantee the cleanness of surrounding working environment, furthermore, the fixed surface of first support frame is connected with the dust cover, the fixed surface of dust cover is connected with the water tank, the inner wall fixedly connected with suction pump of water tank, wherein, the output fixedly connected with outlet pipe of suction pump, the exit end fixedly connected with spraying nozzle of outlet pipe, spraying nozzle aims at first screening groove.

In order to facilitate the transfer of the coal screened by the third screening groove, further, the method further comprises the following steps: the discharge pipe is arranged at the bottom of the first support frame and corresponds to the third screening groove; the second motor is fixedly connected to the side wall of the first support frame, the output end of the second motor is fixedly connected with a screw rod, and the outer wall of the screw rod is in threaded connection with a movable plate; the transfer cylinder is fixedly connected to the surface of the moving plate; the guide rods are symmetrically and fixedly connected to the inner wall of the first support frame, the guide rods penetrate through the movable plate, and the movable plate is connected with the guide rods in a sliding mode.

In order to facilitate the fixing and the dismounting of the transfer cylinder, furthermore, a second supporting plate is arranged on the surface of the moving plate and is L-shaped, the transfer cylinder is positioned on the surface of the second supporting plate, clamping plates are symmetrically hinged to the surface of the second supporting plate, the clamping plates are fixedly connected to the surface of the clamping plates, through holes are formed in the side walls of the supporting plates, screw rods penetrate through the through holes, and nuts are symmetrically in threaded connection with the outer walls of the screw rods.

In order to pour out the coal of collecting in the transfer cylinder in order to facilitate the pouring, furthermore, the surperficial symmetry fixedly connected with second support frame of movable plate, it has the second fly leaf to articulate between second support frame and the second backup pad, wherein, the surface of second support frame articulates there is the cylinder, the output of cylinder articulates there is first fly leaf, the one end and the second backup pad of first fly leaf are articulated, the other end and the second support frame of first fly leaf are articulated.

A screening method for coal mining comprises the following operation steps:

firstly: placing the coal mine in a feed chute, and gradually enabling the coal mine in the feed chute to enter a screening cylinder; then: rotating the screening cylinder to separate coal mines of different sizes; secondly, the method comprises the following steps: starting a suction pump to clean the coal mine and the first screening tank while the step two is carried out; and finally: the colliery that will select from the third screening groove is collected in a transfer cylinder, regularly makes a transfer cylinder keep away from a screening cylinder to make a transfer cylinder upset, pour out the colliery of collecting in the transfer cylinder.

Compared with the prior art, the invention provides screening equipment for coal mining, which has the following beneficial effects:

1. this screening installation for coal mining rotates through starting first motor drive spiral plate and a screening section of thick bamboo, on the one hand, has reduced partial coal and has piled up in the feed chute to influence the normal screening of coal, on the other hand, make coal carry out synchronous revolution along with the screening section of thick bamboo, has improved screening efficiency, simultaneously, because the stock guide plays certain effect of striking off to the screening section of thick bamboo, avoids the colliery material to stop in situ, can effectively reduce blocking phenomenon.

2. This screening installation for coal mining, first screening groove is as first level screening, mainly selects buggy and the colliery of less granule, and moderate colliery is mainly selected as the second level screening to the second screening groove, and third screening groove is as the third level screening, mainly selects great colliery, and great cubic colliery is mainly selected as the fourth level screening to the fourth screening groove, through adopting the mode screening colliery of multistage screening, has improved the screening quality.

3. This screening installation for coal mining through at the screening process, starts the suction pump and carries out water spray treatment to first screening groove, on the one hand, can realize the dust fall effect, and on the other hand conveniently washes the coal ash of great coal surface adhesion, improves the screening quality.

4. This screening installation for coal mining, on the one hand, through starting the second motor, conveniently carry out the fine work colliery, simultaneously, start the first fly leaf of cylinder drive and remove to realize empting the function automatically, improved work efficiency, on the other hand, under the mutually supporting of splint, nut, screw rod, the aspect is taken out and is transported a section of thick bamboo, and washs transporting a section of thick bamboo.

Drawings

Fig. 1 is a first structural schematic diagram of a screening apparatus for coal mining according to the present invention;

fig. 2 is an enlarged schematic view of a structure a in fig. 1 of the screening apparatus for coal mining according to the present invention;

fig. 3 is a schematic structural diagram of a screening apparatus for coal mining according to a second embodiment of the present invention;

FIG. 4 is a first partial schematic structural diagram of a screening apparatus for coal mining according to the present invention;

fig. 5 is an enlarged schematic view of a structure B in fig. 4 of the screening apparatus for coal mining according to the present invention;

FIG. 6 is a schematic view of a part of the structure of a screening apparatus for coal mining according to the present invention;

fig. 7 is an enlarged schematic view of a screening apparatus for coal mining shown in fig. 6 at C.

In the figure: 1. a first support plate; 101. a feeding plate; 102. a feed chute; 103. a first support frame; 104. a first rotating lever; 105. a spiral plate; 106. a chain; 107. a baffle plate; 2. a first motor; 201. a second rotating lever; 202. a screen cylinder; 203. a screening tank; 204. a material guide plate; 205. a discharge chute; 206. a first screening tank; 207. a second screening tank; 208. a third screening tank; 209. a fourth screening tank; 3. a dust cover; 301. a water tank; 302. a suction pump; 303. a water outlet pipe; 304. a spray nozzle; 4. a discharge pipe; 401. a second motor; 402. a screw rod; 403. a guide bar; 404. moving the plate; 405. a transfer drum; 5. a second support plate; 501. a splint; 502. a support plate; 503. a through hole; 504. a screw; 505. a nut; 6. a second support frame; 601. a cylinder; 602. a first movable plate; 603. a second movable plate.

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.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1:

referring to fig. 1 to 4, a screening apparatus for coal mining applications includes a first support frame 103, and further includes: the first support plate 1 is fixedly connected to the side wall of the first support frame 103, the surface of the first support plate 1 is fixedly connected with a feed plate 101, and the surface of the feed plate 101 is provided with a feed groove 102; the first motor 2 is fixedly connected to the side wall of the first supporting plate 1, the output end of the first motor 2 is fixedly connected with a second rotating rod 201, and the second rotating rod 201 is rotatably connected with the first supporting frame 103; the screening cylinder 202 is fixedly connected to the outer wall of the second rotating rod 201, the surface of the screening cylinder 202 is provided with a screening groove 203, the surface of the first support frame 103 is fixedly connected with a material guide plate 204, and the surface of the material guide plate 204 is provided with a material discharge groove 205.

In this embodiment, the feeding plate 101 is inclined toward the screen cylinder 202, the upper surface of the guiding plate 204 is arc-shaped, and the arc surface of the guiding plate 204 is matched with the screen cylinder 202.

When the coal screening device is used, coal is placed in the feeding chute 102, under the action of gravity of the coal, the coal enters the screening cylinder 202, the first motor 2 is started to drive the second rotating rod 201 to rotate, the second rotating rod 201 drives the screening cylinder 202 to rotate, the screening cylinder 202 synchronously rotates in the rotating process, so that the coal with different sizes can conveniently fall into the material guide plate 204 from the corresponding screening chute 203, and finally falls off from the discharging chute 205, the screened coal can be conveniently classified and collected, because in the whole screening process, the coal synchronously rotates along with the screening cylinder 202, the screening efficiency is improved, meanwhile, the material guide plate 204 plays a certain scraping role on the screening cylinder 202, coal mine materials are prevented from staying in place, and the blocking phenomenon can be effectively reduced.

Example 2:

referring to fig. 1-4, essentially the same as in example 1, further, a convenient feed embodiment is added.

Referring to fig. 1-2, the inner wall of the feeding plate 101 is rotatably connected with a first rotating rod 104, the outer wall of the first rotating rod 104 is fixedly connected with a spiral plate 105, wherein the outer walls of the first rotating rod 104 and the second rotating rod 201 are fixedly connected with chain wheels, and a chain 106 is in transmission connection between adjacent chain wheels.

In this embodiment, the output end of the first motor 2 is fixedly connected with the second rotating rod 201, and is converted into a fixed connection at the output end of the first motor 2, and the second rotating rod 201 is rotatably connected between the first supporting plate 1 and the first supporting frame 103.

Start first motor 2 drive first bull stick 104 and rotate, first bull stick 104 drives spiral plate 105 and rotates to reduce partial coal and pile up in feed chute 102, thereby influence the normal screening of coal, simultaneously, under the transmission of chain 106, first bull stick 104 drives second bull stick 201 and rotates, thereby makes a screening section of thick bamboo 202 rotate.

Referring to fig. 1, 3 and 4, the baffle 107 is fixedly connected to the surface of the first support plate 1, so that on one hand, coal can be prevented from rolling out of the feed chute 102 during feeding, and on the other hand, because the baffle 107 is arc-shaped and the baffle 107 is located above the feed chute 102, coal ash can be prevented from flying up in the feeding process to pollute the surrounding working environment.

Example 3:

referring to fig. 4, substantially the same as example 2, further, a specific embodiment of screening coals of different sizes is added.

Because the screening equipment for coal mining in the prior art usually only adopts a first-level screen to screen coal, and the screening effect is poor, the screening groove 203 comprises a first screening groove 206, a second screening groove 207 and a fourth screening groove 209, the first screening groove 206, the second screening groove 207 and the fourth screening groove 209 are all rectangular, the width of the second screening groove 207 is greater than that of the first screening groove 206, and the width of the fourth screening groove 209 is greater than that of the second screening groove 207.

First screening groove 206 is located the one side that screen drum 202 is close to first backup pad 1 to select the coal of equidimension not gradually, make things convenient for the coal to carry out follow-up processing according to the difference of quality.

The sifting groove 203 further comprises a third sifting groove 208, the third sifting groove 208 being circular, the third sifting groove 208 being located between the second sifting groove 207 and the fourth sifting groove 209.

It should be added that the first screening groove 206 is used for first-stage screening to mainly screen coal dust and coal mines with smaller particles, the second screening groove 207 is used for second-stage screening to mainly screen moderate coal mines, the third screening groove 208 is used for third-stage screening to mainly screen larger coal mines, and the fourth screening groove 209 is used for fourth-stage screening to mainly screen larger lump coal mines, and the coal mines are screened in a multi-stage screening mode, so that the screening quality is improved.

Example 4:

referring to fig. 1 to 3, substantially the same as example 3, further, a specific embodiment for ensuring cleanliness of the surrounding working environment is added.

As the coal ash on the surface of the coal is easy to fly to the surrounding working environment in the rotation process of the coal, thereby affecting the cleaning of the surrounding working environment, referring to fig. 1-3, the surface of the first support frame 103 is fixedly connected with the dust cover 3, the surface of the dust cover 3 is fixedly connected with the water tank 301, the inner wall of the water tank 301 is fixedly connected with the suction pump 302, wherein the output end of the suction pump 302 is fixedly connected with the water outlet pipe 303, the outlet end of the water outlet pipe 303 is fixedly connected with the spray nozzle 304, because the coal with the smallest particle size screened by the first screening groove 206 has the largest amount of mixed coal ash, a large amount of smoke is easy to generate, and therefore, the spray nozzle 304 is aligned with the first screening groove 206.

In the screening process, the suction pump 302 is started to enable water flow in the water tank 301 to flow into the water outlet pipe 303, and finally the water flow is sprayed into the first screening groove 206 from the spray nozzle 304, so that the dust fall effect is achieved, meanwhile, coal ash adhered to the surface of large coal is conveniently washed away, and the screening quality is improved.

Example 5:

referring to FIGS. 4-7, essentially the same as in example 4, further, embodiments are added to facilitate the transfer of coal screened out of third screening tank 208.

Because the coal of selecting from third screening groove 208 is fine coal, need shift it and carry, consequently, this screening installation for coal mining still includes: a discharge pipe 4 arranged at the bottom of the first support frame 103, wherein the discharge pipe 4 corresponds to the third screening groove 208; the second motor 401 is fixedly connected to the side wall of the first support frame 103, the output end of the second motor 401 is fixedly connected with a screw rod 402, and the outer wall of the screw rod 402 is in threaded connection with a moving plate 404; a transfer cylinder 405 fixedly connected to the surface of the moving plate 404; and guide rods 403 symmetrically and fixedly connected to the inner wall of the first support frame 103, the guide rods 403 penetrate through the moving plate 404, and the moving plate 404 is connected with the guide rods 403 in a sliding manner.

During screening, the second motor 401 is started to drive the screw rod 402 to rotate, the screw rod 402 drives the moving plate 404 to move under the limiting action of the guide rod 403, so that the transfer cylinder 405 is moved to the lower part of the discharge pipe 4, and when the transfer cylinder 405 is filled with coal mines, the second motor 401 is controlled to convey the transfer cylinder 405 out.

Example 6:

referring to fig. 6-7, substantially the same as example 5, further, embodiments are added to facilitate the attachment and detachment of the transfer drum 405.

In the using process, coal mines collected in the transfer cylinder 405 are inconvenient to pour out, therefore, the surface of the moving plate 404 is provided with the second supporting plate 5, the second supporting plate 5 is L-shaped, the surface of the second supporting plate 5 is symmetrically hinged with the clamping plates 501, the surface of the clamping plates 501 is fixedly connected with the supporting plate 502, the side wall of the supporting plate 502 is provided with the through hole 503, the screw rod 504 penetrates through the through hole 503, and the outer wall of the screw rod 504 is symmetrically in threaded connection with the nut 505.

In this embodiment, the transfer cylinder 405 fixedly attached to the surface of the moving plate 404 is changed such that the transfer cylinder 405 is located on the surface of the second support plate 5, and the second support plate 5 is fixedly attached to the surface of the moving plate 404.

When using, will transport a section of thick bamboo 405 and place the surface at second backup pad 5, rotate splint 501, and make splint 501 hug closely the outer wall of transporting a section of thick bamboo 405, run through-hole 503 with screw rod 504, and with the position of nut 505 set screw rod 504, thereby will transport a section of thick bamboo 405 and second backup pad 5 fixed connection, when need pour the coal in transporting a section of thick bamboo 405, only need take out nut 505, open splint 501, will transport a section of thick bamboo 405 take out can, simultaneously, conveniently wash transporting a section of thick bamboo 405.

Example 7:

referring to fig. 5-6, essentially the same as example 6, further, an embodiment is added to facilitate dumping coal collected in transfer drum 405.

When the coal transfer device is used, coal in the transfer cylinder 405 is poured out in a manual mode, the working efficiency is low, and the labor intensity is high, therefore, the surface of the moving plate 404 is symmetrically and fixedly connected with the second support frame 6, the second moving plate 603 is hinged between the second support frame 6 and the second support plate 5, the first moving plate 602 can improve the stability of the transfer cylinder 405, the surface of the second support frame 6 is hinged with the air cylinder 601, the output end of the air cylinder 601 is hinged with the first moving plate 602, one end of the first moving plate 602 is hinged with the second support plate 5, the other end of the first moving plate 602 is hinged with the second support frame 6, when the coal in the transfer cylinder 405 is poured, the air cylinder 601 is started to drive the first moving plate 602 to move, so that the automatic pouring function is realized, and the working efficiency is improved.

In this embodiment, the second supporting plate 5 is fixedly connected to the surface of the moving plate 404, and the second supporting plate 5 can be turned over on the surface of the moving plate 404.

A screening method for coal mining comprises the following operation steps:

firstly: placing the coal mine in the feed chute 102, and gradually feeding the coal mine in the feed chute 102 into the screening cylinder 202; then: rotating the screening cylinder 202 to separate coal mines of different sizes; secondly, the method comprises the following steps: while the second step is performed, the suction pump 302 is started to clean the coal mine and the first screening tank 206; and finally: the coal mine screened out from the third screening groove 208 is collected in the transfer cylinder 405, the transfer cylinder 405 is periodically separated from the screening cylinder 202, the transfer cylinder 405 is turned over, and the coal mine collected in the transfer cylinder 405 is poured out.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts of the present invention are equivalent to or changed within the technical scope of the present invention.

Claims

1. A screening apparatus for coal mining, includes first support frame (103), its characterized in that still includes:

the first supporting plate (1) is fixedly connected to the side wall of the first supporting frame (103), the surface of the first supporting plate (1) is fixedly connected with a feeding plate (101), and the surface of the feeding plate (101) is provided with a feeding groove (102);

the first motor (2) is fixedly connected to the side wall of the first supporting plate (1), the output end of the first motor (2) is fixedly connected with a second rotating rod (201), and the second rotating rod (201) is rotatably connected with the first supporting frame (103);

the screening cylinder (202) is fixedly connected to the outer wall of the second rotating rod (201), a screening groove (203) is formed in the surface of the screening cylinder (202), a material guide plate (204) is fixedly connected to the surface of the first supporting frame (103), and a material discharge groove (205) is formed in the surface of the material guide plate (204).

2. The screening apparatus for coal mining according to claim 1, wherein a first rotating rod (104) is rotatably connected to an inner wall of the feeding plate (101), a spiral plate (105) is fixedly connected to an outer wall of the first rotating rod (104),

the first rotating rod (104) is fixedly connected to the output end of the first motor (2), the second rotating rod (201) is rotatably connected between the first supporting plate (1) and the first supporting frame (103), and the first rotating rod (104) is in transmission connection with the second rotating rod (201) through a chain (106).

3. A screening apparatus for coal mining according to claim 2, wherein a baffle (107) is fixedly attached to the surface of the first support plate (1).

4. The screening apparatus for coal mining according to claim 1, wherein the screening slot (203) comprises a first screening slot (206), a second screening slot (207) and a fourth screening slot (209), the first screening slot (206), the second screening slot (207) and the fourth screening slot (209) are rectangular, the width of the second screening slot (207) is greater than that of the first screening slot (206), and the width of the fourth screening slot (209) is greater than that of the second screening slot (207).

5. A screening apparatus for coal mining according to claim 4, wherein the screening chute (203) further comprises a third screening chute (208), the third screening chute (208) being circular, the third screening chute (208) being located between the second screening chute (207) and the fourth screening chute (209).

6. A screening apparatus for coal mining according to claim 5, wherein a dust cover (3) is fixedly connected to the surface of the first support frame (103), a water tank (301) is fixedly connected to the surface of the dust cover (3), a suction pump (302) is fixedly connected to the inner wall of the water tank (301),

the output end of the suction pump (302) is fixedly connected with a water outlet pipe (303), the outlet end of the water outlet pipe (303) is fixedly connected with a spray nozzle (304), and the spray nozzle (304) is aligned to the first screening groove (206).

7. The screening apparatus for coal mining of claim 5, further comprising:

the discharge pipe (4) is arranged at the bottom of the first support frame (103), and the discharge pipe (4) corresponds to the third screening groove (208);

the second motor (401) is fixedly connected to the side wall of the first support frame (103), the output end of the second motor (401) is fixedly connected with a screw rod (402), and the outer wall of the screw rod (402) is in threaded connection with a movable plate (404);

a transfer cylinder (405) fixedly connected to the surface of the moving plate (404);

the guide rods (403) are symmetrically and fixedly connected to the inner wall of the first support frame (103), the guide rods (403) penetrate through the moving plate (404), and the moving plate (404) is in sliding connection with the guide rods (403).

8. The screening apparatus for coal mining according to claim 7, wherein a second support plate (5) is arranged on the surface of the moving plate (404), the second support plate (5) is L-shaped, the transfer cylinder (405) is arranged on the surface of the second support plate (5), clamping plates (501) are symmetrically hinged on the surface of the second support plate (5),

the surface of the clamping plate (501) is fixedly connected with a supporting plate (502), the side wall of the supporting plate (502) is provided with a through hole (503), a screw rod (504) penetrates through the through hole (503), and the outer wall of the screw rod (504) is symmetrically in threaded connection with a nut (505).

9. The screening apparatus for coal mining according to claim 8, wherein a second support frame (6) is symmetrically and fixedly connected to the surface of the moving plate (404), a second moving plate (603) is hinged between the second support frame (6) and the second support plate (5),

the surface of the second support frame (6) is hinged with an air cylinder (601), the output end of the air cylinder (601) is hinged with a first movable plate (602), one end of the first movable plate (602) is hinged with the second support plate (5), and the other end of the first movable plate (602) is hinged with the second support frame (6).

10. A screening method for coal mining using a screening apparatus for coal mining as claimed in any one of claims 1 to 9, characterised by the steps of:

the method comprises the following steps: placing the coal mine in the feed chute (102) and gradually leading the coal mine in the feed chute (102) to enter the screening drum (202);

step two: rotating the screen cylinder (202) to separate coal mines of different sizes;

step three: starting a suction pump (302) to clean the coal mine and the first screening tank (206) at the same time of the step two;

step four: the coal mine screened out from the third screening groove (208) is collected in a transfer cylinder (405), the transfer cylinder (405) is periodically separated from the screening cylinder (202), the transfer cylinder (405) is turned over, and the coal mine collected in the transfer cylinder (405) is poured out.