CN212664140U

CN212664140U - Raw coal classifying screen

Info

Publication number: CN212664140U
Application number: CN202021163102.2U
Authority: CN
Inventors: 张强; 牛彦荣; 梁怀金; 孔维平
Original assignee: Inner Mongolia Guanglilong Energy Co Ltd
Current assignee: Inner Mongolia Guanglilong Energy Co Ltd
Priority date: 2020-06-20
Filing date: 2020-06-20
Publication date: 2021-03-09
Anticipated expiration: 2030-06-20

Abstract

The utility model relates to a raw coal classifying screen, which belongs to the technical field of raw coal classifying screens and comprises a screening box, wherein a feed inlet and a discharge pipe are arranged on the screening box, a first screen plate, a first bearing plate, a second screen plate and a second bearing plate are sequentially arranged in the screening box from top to bottom, the first screen plate, the first bearing plate, the second screen plate and the second bearing plate are matched with an S-shaped raw coal screening channel formed by the inner wall of the screening box, wherein, the side edge of the first screen plate connected with the first bearing plate and the side edge of the second screen plate connected with the second bearing plate are all separated from the inner wall of the screening box, the side edges adjacent to the mutually connected side edges are all tightly attached to the inner wall of the screening box, a first discharge pipe and a second discharge pipe are communicated on the vertical side wall of the screening box, the first discharge pipe is used for the first bearing plate to stop the transportation of raw coal, and the second discharge pipe is used for the second bearing plate to stop the, the utility model discloses carry out multistage screening after having the single feeding, promote the effect of raw coal screening efficiency.

Description

Raw coal classifying screen

Technical Field

The utility model belongs to the technical field of the technique of raw coal classifying screen and specifically relates to a raw coal classifying screen is related to.

Background

At present, a classifying screen is widely applied to screening and classifying procedures of raw materials and finished products in various industries such as grain, food, chemical industry, sugar manufacturing, mines, coal mines, metallurgy, paper making and the like, and the classifying screen is mechanical equipment for classifying materials by utilizing vibration.

The prior Chinese patent with reference to publication number CN201161238Y discloses a classifying screen for screening powdery materials or granular materials, which comprises a frame, a suspension device, a driving device and a screen boat, wherein the screen boat and the driving device are suspended on the frame through the suspension device, the driving device is connected with the front end of the screen boat, the suspension device at the rear end of the screen boat is provided with a support frame, the support frame is provided with a suspension mechanism, the suspension mechanism is respectively connected with the rear end of the screen boat and the upper end of the support frame, and the suspension mechanism adopts an elastic plastic plate; the effects of firm support, long service life, simple structure and low cost are achieved.

The above prior art solutions have the following drawbacks: the materials are screened, the materials are screened by the screen boat in a single time, the materials left on the screen boat are taken out and screened in different specifications in a secondary mode, and the screening progress is influenced by complex operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a raw coal classifying screen carries out multistage screening after reaching the single feeding, promotes raw coal screening efficiency's effect.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a raw coal classifying screen comprises a screening box, a feed inlet is arranged on the screening box, the bottom of the screening box is communicated with a discharge pipe, the feed inlet is positioned at the top position of the vertical side wall of the screening box, a first screen plate, a first bearing plate, a second screen plate and a second bearing plate are sequentially arranged in the screening box from top to bottom, the first screen plate is fixedly connected with the inner wall of the screening box, a fixed point is positioned below the feed inlet, the other end of the first screen plate is fixedly connected with one end of the first bearing plate, the first screen plate is integrally arranged in an inclined manner, the arrangement direction is inclined downwards along the direction far away from the feed inlet, one end of the first bearing plate far away from the first screen plate is fixedly connected with the inner wall of the screening box where the feed inlet is positioned, the horizontal height of the fixed position is lower than that of the first screen plate and the first bearing plate are connected, the second screen plate is arranged in parallel to the first bearing plate, the other end and second are accepted board fixed connection, the second is accepted the board and is kept away from second sieve one end and just to the screening incasement wall fixed connection of feed inlet, and fixed position's level is less than the level that second sieve and second accepted the board handing-over position, wherein the side of first sieve and first accepting the board handing-over, and the side of board handing-over is accepted to second sieve and second, all there is the interval with screening incasement wall, and adjacent side all closely laminates with screening incasement wall, the intercommunication has first discharging pipe and second discharging pipe on the vertical lateral wall of screening case, first discharging pipe supplies first accepting the board to block the transportation of raw coal, the second discharging pipe supplies the second to accept the board and blocks the transportation of raw coal.

By adopting the technical scheme, the screening box provides a screening field for screening raw coal, the screening box is relatively closed, the pollution of coal dust to air is reduced, the first sieve plate and the second sieve plate have the effect of screening the raw coal twice, the first receiving plate and the second receiving plate receive coal blocks obtained by screening the raw coal twice and convey the coal blocks out of the screening box through the first discharge pipe and the second discharge pipe, the first discharge pipe and the second discharge pipe provide convenient transportation conditions for the screened coal blocks, the raw coal which does not pass through the first sieve plate and the second sieve plate is conveyed to the next process through the discharge pipe, the first sieve plate, the first receiving plate, the second sieve plate and the second receiving plate are arranged in a way that the dead weight of the raw coal is utilized, so that the raw coal entering the screening box through the feed inlet rolls downwards by utilizing the gravity and is screened at the same time, and the arrangement way of the first receiving plate and the second receiving plate not only plays a role of receiving the coal blocks, still played first sieve or second sieve and supported fixed action, strengthened the bearing capacity of first sieve and second sieve, made this device carry out multistage screening after having reached the single feeding, promoted the effect of raw coal screening efficiency.

The utility model discloses further set up to: the screening incasement is fixed and is provided with the reinforcing plate, and the reinforcing plate is provided with a plurality ofly, and the reinforcing plate is located the screening case respectively and is close to first sieve and the first inner wall of accepting the board handing-over side to and the second sieve is accepted on the inner wall of board handing-over side with the second, the reinforcing plate is close to all fixed rubber pads that is provided with in screening incasement portion one side.

Through adopting above-mentioned technical scheme, the raw coal rolls in the screening incasement slope through the first sieve of slope and second sieve, and the fixed position of reinforcing plate and rubber pad, for the position that most raw coal rolls to screening incasement wall impact, the impact resistance of screening incasement wall has been strengthened in the setting up of reinforcing plate, the impact that the setting of rubber pad brought the raw coal has played the cushioning effect, the noise that the raw coal impact screening incasement wall brought has been reduced simultaneously, noise pollution has been reduced when having prolonged screening case life.

The utility model discloses further set up to: reinforcing plate and rubber pad are all embedded to be fixed in the vertical lateral wall of screening case, and the rubber pad is close to the inside lateral wall of screening incasement portion and screens incasement wall coplane.

Through adopting above-mentioned technical scheme, reinforcing plate and the embedded fixed mode of rubber pad provide bigger space for raw coal screening passageway, have reduced reinforcing plate and rubber pad and have taken up the space of screening incasement portion.

The utility model discloses further set up to: the screening case is gone up to slide and is provided with first mediation piece and second mediation piece, first mediation piece includes first handle and first mediation board, first handle be located screening roof portion and with first mediation board fixed connection, first mediation board runs through screening roof portion and second sieve top butt, first mediation board is tightly pasted the screening case and is just to the inner wall setting of feed inlet, second mediation piece includes second handle and second mediation board, the second handle is located screening bottom of the case portion, the second handle is rotated with second mediation board and is connected, second mediation board runs through screening bottom of the case portion and first board bottom butt of accepting, the second mediation board is tightly pasted the feed inlet place tank wall setting.

By adopting the technical scheme, the first handle is held by a person, when a channel formed between the joint of the first sieve plate and the first bearing plate and the inner wall of the screening box is blocked, the first handle is held by the person to vertically pull the first dredging plate, so that a raw coal screening channel is dredged, and the normal operation of raw coal screening is ensured; the vertical pull of second mediation board is accepted with the handheld second handle of reason with the second, accepts the raw coal screening passageway mediation that forms between board handing-over department and the screening incasement wall with second sieve and second, guarantees the normal clear of raw coal screening.

The utility model discloses further set up to: screening bottom of the case portion is fixed and is provided with L type cardboard, and L type cardboard is located under the second mediation subassembly, has seted up the draw-in groove on the L type cardboard, and the draw-in groove supplies the second handle to pass L type cardboard, is provided with the bearing between second handle and the second mediation board.

Through adopting the above technical scheme, the setting of bearing is convenient for the second handle and is rotated for second mediation board, thereby make the second handle rotate with the position of draw-in groove adaptation, the L type cardboard is pulled out through the draw-in groove with the second handle to the pull second handle, make second mediation piece normal use, when second mediation piece does not use, rotatory second handle once more, make the second handle pass L type cardboard through the draw-in groove, rotatory second handle once more makes L type cardboard play the bearing effect to the second handle, accomplish accomodating of second mediation piece.

The utility model discloses further set up to: the screening aperture of the first sieve plate is different from that of the second sieve plate, and the screening aperture of the first sieve plate is smaller than that of the second sieve plate.

Through adopting above-mentioned technical scheme, the screening case from top to bottom sieves out minimum particle diameter, medium particle diameter and the raw coal of maximum particle diameter in proper order, utilizes the fixed mode of first sieve and second sieve simultaneously, makes the raw coal utilize the dead weight to realize falling in the screening, and the raw coal of different particle diameters is screened in grades, compares the raw coal of screening with the particle diameter in grades, and efficiency is higher.

The utility model discloses further set up to: the feed inlet department is fixed and is provided with the feed chute, and the feed chute bottom is the arc form, and the arc concave surface is just to the feed inlet setting.

Through adopting above-mentioned technical scheme, the feed chute of arc bottom makes when the screening case is filled to the raw coal, and the impact that the raw coal falls is accepted at first to the feed chute tank bottom, and the curved tank bottom has brought the cushioning effect for the raw coal impact, and the raw coal advantage of the fact slides in the screening case, when having reduced the raw coal and having carried into the screening case, causes direct impact to screening case inner structure, has prolonged the life of screening case inner structure.

The utility model discloses further set up to: the screening bottom of the case portion is fixedly provided with a supporting leg, and a vibration platform is fixedly connected to the lower portion of the supporting leg.

Through adopting above-mentioned technical scheme, the landing leg will screen bottom of the case portion and leave the interval with vibration platform, for the setting of discharge tube provides the space, vibration platform provides the vibrations effect to the screening case, guarantees that the raw coal in the screening case lasts the roll-off, reduces the raw coal and piles up the emergence of jam phenomenon.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the arrangement mode of the first sieve plate, the first bearing plate, the second sieve plate and the second bearing plate utilizes the dead weight of raw coal, so that the raw coal entering the screening box through the feed inlet rolls downwards by utilizing the gravity and is screened at the same time, the device achieves the effect of carrying out multi-stage screening after single feeding, and the screening efficiency of the raw coal is improved;

2. the screening aperture of the first sieve plate is smaller than that of the second sieve plate, and raw coal with different particle sizes is screened in a grading mode, so that the efficiency is higher compared with the screening of raw coal with the same particle size in a grading mode;

3. the smooth rolling of raw coal in the screening box has been guaranteed in setting up of first mediation piece and second mediation piece, plays the mediation effect to raw coal blocking phenomenon.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a sectional view showing the internal structure of the present embodiment;

FIG. 3 is a schematic diagram showing a partial structure of an L-shaped card;

fig. 4 is an enlarged view of a portion a in fig. 2.

In the figure, 1, a screening box; 11. a first screen deck; 12. a first bearing plate; 13. a second screen deck; 14. a second bearing plate; 15. a first discharge pipe; 16. a second discharge pipe; 2. a feed inlet; 21. a feed chute; 3. a discharge pipe; 4. a reinforcing plate; 41. a rubber pad; 5. a first dredging member; 51. a first handle; 52. a first dredging plate; 6. a second dredging part; 61. a second handle; 62. a second dredging plate; 7. a bearing; 8. an L-shaped clamping plate; 81. a card slot; 9. vibrating the platform; 91. and (7) supporting legs.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the raw coal classifying screen disclosed by the present invention comprises a screening box 1, a feed inlet 2 is provided on the screening box 1, a discharge pipe 3 is connected to the bottom of the screening box 1, a support leg 91 is fixedly provided at the bottom of the screening box 1, a vibration platform 9 is fixedly provided at the bottom of the support leg 91, a first discharge pipe 15 and a second discharge pipe 16 are connected to the vertical side wall of the screening box 1, raw coal is fed into the screening box 1 from the feed inlet 2, the vibration platform 9 is started to improve screening efficiency by vibration, raw coal is screened in the screening box 1 for multiple times, raw coal screened for the first time is transported to the next process through the first discharge pipe 15, raw coal screened for the second time is transported to the next process through the second discharge pipe 16, remaining raw coal finally screened is transported to the next process through the discharge pipe 3, raw coal of the same batch enters the screening box 1, is screened in multiple stages and transported to the next process through different channels, make this device carry out multistage screening after having reached the single feeding, promote the effect of raw coal screening efficiency.

Referring to fig. 2, a feed port 2 is positioned at the top of a vertical side wall of a screening box 1, a feed chute 21 is fixedly arranged on the vertical outer wall of the screening box 1, the feed chute 21 is positioned at the feed port 2, the bottom of the feed chute 21 is arranged in an arc shape, so that raw coal can be better transferred to the feed port 2 and enter the screening box 1 through the feed port 2, a first sieve plate 11, a first receiving plate 12, a second sieve plate 13 and a second receiving plate 14 are sequentially arranged in the screening box 1 from top to bottom, one end of the first sieve plate 11 is fixedly connected with the vertical side wall where the feed port 2 is positioned, a fixed position is close to the lowest end of the feed port 2, the first sieve plate 11 is obliquely arranged and is obliquely downwards arranged along the direction far away from the vertical side wall where the feed port 2 is positioned, one end of the first receiving plate 12 is fixedly connected with an overhanging end of the first sieve plate 11, the other end, the fixed position is positioned below the lowest point of the first sieve plate 11, the lowest end of the communication part of the first discharging pipe 15 and the sieving box 1 is flush with the lowest end of the first bearing plate 12, and the first discharging pipe 15 is continuously downwards inclined along the inclined direction of the first bearing plate 12 so as to more smoothly bear raw coal falling off from the first bearing plate 12; the second sieve plate 13 is arranged in parallel with the first bearing plate 12, one end of the second sieve plate 13 is fixedly connected with the vertical inner wall of the screening box 1 opposite to the feeding port 2, the overhanging end of the second sieve plate 13 is fixedly connected with the second bearing plate 14, one end of the second bearing plate 14, far away from the second sieve plate 13, is fixedly connected with the vertical inner wall of the screening box 1 opposite to the feeding port 2, the fixed position of the second bearing plate 14 is lower than the lowest end of the second sieve plate 13, the lowest end of the communication part of the second discharging pipe 16 and the vertical side wall of the screening box 1 is flush with the lowest end of the second bearing plate 14, and the second discharging pipe 16 is continuously arranged in a downward inclination mode along the inclination direction of the second bearing plate 14 so as to more smoothly bear raw coal falling off the; wherein first sieve 11 and first one end of accepting the crossing of board 12 and second sieve 13 and the crossing one end of second accepting board 14 all have a distance with screening case 1 inner wall, and first sieve 11, first accepting board 12, second sieve 13, the remaining circumference lateral wall of second accepting board 14 all with screening case 1 inner wall butt, thereby S type' S raw coal screening passageway has been formed, from taking the sieve mesh on first sieve 11 and the second sieve 13, and the sieve mesh aperture on the first sieve 11 is less than the sieve mesh aperture on the second sieve mesh, the raw coal particle diameter through first sieve 11 is less than the raw coal particle diameter through second sieve 13 promptly, and the raw coal of maximum particle diameter finally flows out screening case 1 from discharge tube 3 through S type screening passageway, carry out the screening of multistage different particle diameter raw coal after making this device reach the single feeding, promote the effect of raw coal screening efficiency.

Referring to fig. 2 and 3, the top of the screening box 1 is provided with a first dredging part 5, and the first dredging part 5 comprises a first handle 51 and a first dredging plate 52. The first handle 51 is fixedly connected with the first dredging plate 52, the first handle 51 is rectangular and long, the first dredging plate 52 is a rectangular long strip plate, the first dredging plate 52 is vertically arranged and penetrates through the top of the screening box 1, the first dredging plate 52 is tightly attached to the vertical side wall of the screening box 1 just facing the feed port 2, one end, far away from the first handle 51, of the first dredging plate 52 is abutted to the top of the second screen plate 13, the horizontal projection of the first handle 51 is perpendicular to the horizontal projection of the first dredging plate 52, in an S-shaped raw coal screening channel formed in the screening box 1, when raw coal at the turning part of the S-shaped raw coal screening channel is blocked, the first dredging plate 52 is pulled outwards by holding the first handle 51, then the first dredging plate 52 is inserted and embedded into the screening box 1, and after the piston moves, the blockage at the turning part of the S-shaped channel is dredged, and the normal operation of the device is ensured; the bottom of the screening box 1 is provided with a second dredging part 6, the second dredging part 6 comprises a second handle 61 and a second dredging plate 62, a bearing 7 is arranged between the second handle 61 and the second dredging plate 62, so that the second handle 61 is in a rotary connection mode relative to the second dredging plate 62, the second handle 61 is positioned outside the screening box 1, the second dredging plate 62 penetrates through the bottom of the screening box 1 and is tightly attached to the vertical side wall of the screening box 1, which is provided with the feed inlet 2, the top of the second dredging plate 62 is abutted to the bottom surface of the first bearing plate 12, the bottom of the screening box 1 is fixedly provided with an L-shaped clamping plate 8, a clamping groove 81 is arranged on the L-shaped clamping plate 8, the second handle 61 is used for penetrating through the L-shaped clamping plate 8, the second handle 61 is erected on the L-shaped clamping plate under the condition that the second dredging part 6 is not used, when the second dredging part 6 is used, the second handle 61 is rotated, so that the horizontal projection of the second handle 61 is coincide, then pulling second handle 61 makes second handle 61 pass L type cardboard 8, second handle 61 is the simple and easy handle of rectangle rectangular strip board and the perpendicular fixed formation of round bar, round bar adaptation draw-in groove 81 makes second handle 61 run through L type cardboard 8 promptly, when S type passageway blocks up, dredge board 62 through the pull second, the distance of 62 pulls of second dredge board this moment is the distance of the vertical length of round bar, satisfy this device and use, the passageway mediation of 62 with the raw coal screening of pull second dredge board has guaranteed the smooth and easy implementation of this device, the screening efficiency of this device has been promoted.

Referring to fig. 2 and 4, the turning of the S-shaped raw coal screening channel formed by the first sieve plate 11, the first receiving plate 12, the second sieve plate 13 and the second receiving plate 14 in the screening box 1 is the position where the raw coal hits the most times when sliding in the S-direction channel, the reinforcing plate 4 is fixedly embedded in the screening box 1, the rubber pad 41 is fixedly arranged on one side of the reinforcing plate 4 close to the inside of the screening box 1, the rubber pad 41 is flush with the inner wall of the screening box 1 facing to one side of the inside of the screening box 1, and the channel width of the S-shaped raw coal screening channel is ensured while the impact resistance of the screening box 1 is enhanced.

The implementation principle of the embodiment is as follows: add raw coal in feed chute 21, raw coal passes through feed inlet 2 and passes through in proper order on first sieve 11 and second sieve 13, through the vibrations of vibrations platform 9 simultaneously, make the whole vibrations of screening case 1, raw coal is slided while being shaken, raw coal through first sieve 11 slides on first accepting board 12 and finally transports to next process department through first discharging pipe 15, raw coal through second sieve 13 slides on second accepting board 14 and finally transports to next process department through second discharging pipe 16, finally remaining raw coal transports to next process department through discharge tube 3, when this device blocks up, take out the inside raw coal screening passageway of first mediation piece 5 and the mediation piece 6 of second mediation this device, reach and guarantee this device normal operating, promote the effect to raw coal screening efficiency.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a raw coal classifying screen, includes screening case (1), has seted up feed inlet (2) on screening case (1), and screening case (1) bottom intercommunication has discharge tube (3), its characterized in that: the feed inlet (2) is positioned at the top of the vertical side wall of the screening box (1), a first sieve plate (11), a first bearing plate (12), a second sieve plate (13) and a second bearing plate (14) are sequentially arranged in the screening box (1) from top to bottom, one end of the first sieve plate (11) is fixedly connected with the inner wall of the screening box (1), a fixed point is positioned below the feed inlet (2), the other end of the first sieve plate is fixedly connected with one end of the first bearing plate (12), the first sieve plate (11) is integrally arranged in an inclined manner, the arrangement direction is arranged in an inclined manner along the direction far away from the feed inlet (2), one end of the first bearing plate (12) far away from the first sieve plate (11) is fixedly connected with the inner wall of the screening box (1) where the feed inlet (2) is positioned, the horizontal height of the fixed position is lower than the horizontal height of the joint position of the first sieve plate (11) and the first bearing plate (12), the second sieve plate (13) is arranged in parallel, one end of a second sieve plate (13) is fixedly connected with the inner wall of the screening box (1) which is just opposite to the feed inlet (2), the other end of the second sieve plate is fixedly connected with a second bearing plate (14), one end, far away from the second sieve plate (13), of the second bearing plate (14) is fixedly connected with the inner wall of the screening box (1) which is just opposite to the feed inlet (2), the horizontal height of the fixed position is lower than the horizontal height of the joint position of the second sieve plate (13) and the second bearing plate (14), wherein the side edge of the joint of the first sieve plate (11) and the first bearing plate (12) and the side edge of the joint of the second sieve plate (13) and the second bearing plate (14) are both separated from the inner wall of the screening box (1), the adjacent side edges are both tightly attached to the inner wall of the screening box (1), the vertical side wall of the screening box (1) is communicated with a first discharging pipe (15) and a second discharging pipe (16), and the first discharging pipe (15) is, the second discharging pipe (16) is used for stopping the transportation of the raw coal by the second bearing plate (14).

2. The raw coal classifying screen according to claim 1, characterized in that: screening case (1) internal fixation is provided with reinforcing plate (4), and reinforcing plate (4) are provided with a plurality ofly, and reinforcing plate (4) are located screening case (1) respectively and are close to on first sieve (11) and the first inner wall of accepting board (12) handing-over side to and second sieve (13) and second accept on the inner wall of board (14) handing-over side, reinforcing plate (4) are close to all fixed rubber pad (41) that is provided with in inside one side of screening case (1).

3. The raw coal classifying screen according to claim 2, characterized in that: reinforcing plate (4) and rubber pad (41) are all embedded to be fixed in the vertical lateral wall of screening case (1), and rubber pad (41) are close to the inside lateral wall of screening case (1) and screening case (1) inner wall coplane.

4. The raw coal classifying screen according to claim 1, characterized in that: screening case (1) is gone up to slide and is provided with first mediation piece (5) and second mediation piece (6), first mediation piece (5) is including first handle (51) and first mediation board (52), first handle (51) are located screening case (1) top and with first mediation board (52) fixed connection, first mediation board (52) run through screening case (1) top and second sieve (13) top butt, screening case (1) is hugged closely in first mediation board (52) just to the inner wall setting of feed inlet (2), second mediation piece (6) are including second handle (61) and second mediation board (62), second handle (61) are located screening case (1) bottom, second handle (61) rotate with second mediation board (62) and are connected, second mediation board (62) run through screening case (1) bottom and first accepting board (12) bottom butt, the setting in second mediation board (62) place is hugged closely.

5. The raw coal classifying screen according to claim 4, characterized in that: screening case (1) bottom is fixed and is provided with L type cardboard (8), and L type cardboard (8) are located under the second mediation subassembly, have seted up draw-in groove (81) on L type cardboard (8), and draw-in groove (81) supply second handle (61) to pass L type cardboard (8), are provided with bearing (7) between second handle (61) and the second mediation board (62).

6. The raw coal classifying screen according to claim 1, characterized in that: the screening apertures of the first screen plate (11) and the second screen plate (13) are different, and the screening aperture of the first screen plate (11) is smaller than that of the second screen plate (13).

7. The raw coal classifying screen according to claim 1, characterized in that: the feed inlet (2) is fixedly provided with a feed chute (21), the bottom of the feed chute (21) is arc-shaped, and the arc-shaped concave surface is arranged right opposite to the feed inlet (2).

8. The raw coal classifying screen according to claim 1, characterized in that: screening case (1) bottom is fixed and is provided with landing leg (91), and landing leg (91) below fixedly connected with shaking platform (9).