White corundum screening instrument with uniform feeding function

Abstract

The utility model relates to the technical field of screening instruments, in particular to a white corundum screening instrument with uniform feeding, which can uniformly and quantitatively feed materials to a screen plate, the feeding quantity is not influenced by the depth of white corundum, and the screening rate is stable. Comprising a storage box; the device further comprises a feeding mechanism, a conveying belt, a door frame, two first screws, a material flattening plate and a screening mechanism, the feeding mechanism is installed in the material storage box, the conveying belt is installed on the material storage box, the feeding mechanism conveys white corundum in the material storage box to the input end of the conveying belt, the door frame is installed on the material storage box, and the two first screws are rotationally connected to a cross beam of the door frame in a screwed mode. The lower ends of the two first screws are connected with the material flattening plate, the material flattening plate is located above the middle of the conveying belt, a gap is formed between the lower end of the material flattening plate and the conveying belt, the two ends of the material flattening plate extend out of the two sides of the conveying belt, the material flattening plate is located above the material storage box, the screening mechanism is installed outside the material storage box, and the output end of the conveying belt extends into the input end of the screening mechanism. The screening mechanism screens white corundum.

Description

Technical Field

[0001] The utility model relates to the technical field of screening equipment, in particular to a white corundum screening equipment with uniform feeding. Background Art

[0002] White corundum is a high-hardness powder, usually used for abrasives and refractory materials. In production, white corundum is used in different work scenarios according to different particle sizes, so it is necessary to screen white corundum. The Chinese utility model patent with the prior art application number CN202120000280.1 proposes a white corundum screening device that can be fed evenly. The device is provided with an auxiliary feeder, a punching plate, a rotating shaft and an axis frame, so that the feed port of the screening device is driven by the internal bearing of the axis frame on one side of the auxiliary feeder when feeding, so that the rotating shaft can be effectively rotated, and when the rotating shaft rotates, the auxiliary feeder is driven to rotate, so that the auxiliary feeder can effectively drive the punching plate, and the punching plates are staggered, so that the punching plates can evenly cross-strike the white corundum when rotating. When the white corundum enters the feed port, the uniform blow of the punching plate can effectively speed up the entry speed of the white corundum, and the cross design makes the white corundum more orderly and uniform when entering, so that a large amount of white corundum will not accumulate in the feed port.

[0003] However, the feed mechanism of the prior art cannot uniformly control the feed amount. When the depth of the white corundum in the feed port is greater, the feed amount is greater; when the depth of the white corundum in the feed port is smaller, the feed amount is smaller, resulting in an unstable screening rate. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a white corundum screening device which can feed material uniformly and quantitatively to the screen plate, wherein the feeding amount is not affected by the depth of the white corundum, and the screening rate is stable and the feeding is uniform.

[0005] The utility model discloses a white corundum screening device with uniform feeding, comprising a material storage box; a feeding mechanism, a conveyor belt, a door frame, two screw rods, a flat material plate and a screening mechanism, wherein the feeding mechanism is installed in the material storage box, the conveyor belt is installed on the material storage box, the feeding mechanism transports the white corundum in the material storage box to the input end of the conveyor belt, the door frame is installed on the material storage box, the two screw rods are rotatably screwed on the cross beam of the door frame, the lower ends of the two screw rods are connected to the flat material plate, the flat material plate is located above the middle of the conveyor belt, a gap is set between the lower end of the flat material plate and the conveyor belt, the two ends of the flat material plate extend out of the two sides of the conveyor belt, the flat material plate is located above the material storage box, and the screening mechanism is installed outside the material storage box. The output end of the conveyor belt extends into the input end of the screening mechanism, and the screening mechanism screens white corundum; when working, the feeding amount of the feeding mechanism is set to be greater than the feeding amount of the screening mechanism, and the white corundum is stored in the storage box. The feeding mechanism runs to transport the white corundum to the input end of the conveyor belt, and the conveyor belt transports the white corundum to the screening mechanism. When the white corundum passes through the flat material plate, the flat material plate smoothes the white corundum and scrapes the excess white corundum back into the storage box, so that the thickness of the white corundum on the conveyor belt passing through the flat material plate is consistent, thereby realizing uniform quantitative feeding to the screening mechanism, and the feeding amount of the screening mechanism is not affected by the depth of the white corundum in the storage box, so that the screening rate of the screening mechanism is stable.

[0006] Preferably, the feeding mechanism includes a motor, a driving shaft, two active sprockets, a supporting shaft, two driven sprockets, two chains and multiple hoppers, the motor is installed outside the material storage box, the output shaft of the motor is transmission connected with the driving shaft, the driving shaft is rotatably installed in the material storage box, the two active sprockets are concentrically installed on the driving shaft, the supporting shaft is rotatably installed on the material storage box through a bracket, the two driven sprockets are concentrically installed on the supporting shaft, one end of the two chains is respectively mounted on the two active sprockets, and the other ends of the two chains are respectively mounted on the two driven sprockets, and multiple hoppers are evenly installed on the outsides of the two chains; the two active sprockets and the two driven sprockets support the two chains, the motor drives the driving shaft to rotate, the driving shaft drives the two active sprockets to rotate, the two active sprockets drive the two chains to rotate, and the two chains drive multiple hoppers to rotate, so that multiple hoppers take out white corundum from the storage box in turn and put it into the input end of the conveyor belt, thereby realizing efficient feeding.

[0007] Preferably, it also includes a sleeve and multiple stirring rods, the sleeve is sleeved on the driving shaft, and the multiple stirring rods are evenly installed on the outer wall of the sleeve; when the driving shaft rotates, the sleeve and the multiple stirring rods are driven to rotate, and the multiple stirring rods stir the white corundum in the storage box to prevent the white corundum from becoming compacted.

[0008] Preferably, it also includes a sliding rod, two auxiliary rods, two bearings and two cams, the sleeve is slidably fitted with a spline groove on the outer wall of the driving shaft by a spline, the sliding rod is installed on the storage box, the upper ends of the auxiliary rods are slidably connected to the sliding rod, and bearings are installed at the lower ends of the two auxiliary rods. The two bearings are fitted on the two ends of the sleeve, and the two cams are rotatably mounted on the two auxiliary rods, and the wheel surfaces of the two cams are in rolling contact with the inner end surfaces of the two active sprockets respectively, and the two cams are arranged in a matrix; when the driving shaft drives the two active sprockets to rotate, the two active sprockets respectively drive the two cams to rotate through friction. Due to the arrangement of the two cam matrices, when the protruding portion of one cam is in rolling contact with one active sprocket, the contracted portion of the other cam is in rolling contact with the other active sprocket, thereby driving the sleeve to move left and right along the driving shaft through the two auxiliary rods and the two bearings, and the sliding rod guides the upper ends of the two auxiliary rods, so that the sleeve and multiple stirring rods can move left and right while rotating, thereby improving the stirring effect.

[0009] Preferably, the screening mechanism includes a mounting frame, a sieve plate and a paving plate. The sieve plate is mounted in the mounting frame, the sieve plate is arranged tilted, the upper end of the sieve plate is located below the output end of the conveyor belt, the two ends of the paving plate are rotatably connected to the two sides of the mounting frame through an axle rod, and a gap is set between the lower end of the paving plate and the sieve plate; the paving plate intercepts the white corundum on the sieve plate, and transports the white corundum downward through the gap between the paving plate and the sieve plate, so that the white corundum is spread flat on the sieve plate. The angle of the paving plate can be adjusted to change the size of the above gap, which can adapt to different feed amounts and has good practicality.

[0010] Preferably, it also includes a baffle and two arc-shaped grooves, fine sieve holes are arranged on the upper part of the sieve plate, coarse sieve holes are arranged on the lower part of the sieve plate, the lower end of the baffle is in rotational contact with the connection between the upper and lower parts of the sieve plate, arc-shaped grooves are arranged on both sides of the mounting frame, the two sides of the baffle are respectively inserted in the two arc-shaped grooves by screws, and two nuts are screwed on the two screws of the baffle for locking; multi-stage screening is achieved by arranging fine sieve holes and coarse sieve holes on the sieve plate, the position of the screw of the baffle is adjusted along the two arc-shaped grooves, and the angle of the baffle is adjusted so that the baffle blocks the white corundum on the upper part of the sieve plate, so that the white corundum enters the lower part for re-screening after being fully screened, which has good practicality.

[0011] Preferably, it also includes two springs, two swing arms and two pull rods. The two sides of the lower end of the storage box are elastically installed on the machine base through two springs. The inner ends of the two swing arms are connected to the two ends of the rotating shaft of the output roller of the conveyor belt. The upper ends of the two pull rods are respectively rotatably connected to the outer ends of the two swing arms, and the lower ends of the two pull rods are respectively rotatably connected to the two sides of the upper end of the installation frame; the output roller shaft of the conveyor belt drives the two swing arms to rotate, and the two swing arms drive the two pull rods to pull the upper end of the installation frame to reciprocate and rise and fall. Under the elastic support of the two springs, the screen plate vibrates to improve the screening speed.

[0012] Compared with the prior art, the utility model has the following beneficial effects: when working, the feeding amount of the feeding mechanism is set to be greater than the feeding amount of the screening mechanism, the white corundum is stored in the storage box, the feeding mechanism runs to transport the white corundum to the input end of the conveyor belt, the conveyor belt transports the white corundum to the screening mechanism, when the white corundum passes through the flat material plate, the flat material plate smoothes the white corundum, and scrapes the excess white corundum back into the storage box, so that the thickness of the white corundum on the conveyor belt passing through the flat material plate is consistent, thereby realizing uniform quantitative feeding to the screening mechanism, the feeding amount of the screening mechanism is not affected by the depth of the white corundum in the storage box, so that the screening rate of the screening mechanism is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the side section structure of the utility model;

[0015] Figure 3 It is a structural diagram of the feeding mechanism;

[0016] Figure 4 It is a schematic diagram of the structure of the motor, drive shaft, sleeve, stirring rod, sliding rod, auxiliary rod, bearing and cam;

[0017] Figure 5 It is a schematic diagram of the structure of the conveyor belt, gantry, screw rod and flat plate;

[0018] Figure 6 It is a structural diagram of the screening mechanism.

[0019] Markings in the attached drawings: 1. Storage box; 2. Feeding mechanism; 3. Conveyor belt; 4. Door frame; 5. Screw rod 1; 6. Flat plate; 7. Screening mechanism; 8. Motor; 9. Driving shaft; 10. Driving sprocket; 11. Support shaft; 12. Driven sprocket; 13. Chain; 14. Hopper; 15. Sleeve; 16. Agitator rod; 17. Slide rod; 18. Auxiliary rod; 19. Bearing; 20. Cam; 21. Mounting frame; 22. Screen plate; 23. Paving plate; 24. Baffle; 25. Arc groove; 26. Spring; 27. Swing arm; 28. Pull rod. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] Example 1

[0022] like Figure 1 and Figure 2 As shown, a white corundum screening device with uniform feeding includes a storage box 1; it also includes a feeding mechanism 2, a conveyor belt 3, a door frame 4, two screw rods 5, a flat material plate 6 and a screening mechanism 7. The feeding mechanism 2 is installed in the storage box 1, and the conveyor belt 3 is installed on the storage box 1. The feeding mechanism 2 conveys the white corundum in the storage box 1 to the input end of the conveyor belt 3. The door frame 4 is installed on the storage box 1. The two screw rods 5 are rotatably screwed on the crossbeam of the door frame 4. The lower ends of the two screw rods 5 are connected to the flat material plate 6. The flat material plate 6 is located above the middle part of the conveyor belt 3. A gap is set between the lower end of the flat material plate 6 and the conveyor belt 3. The two ends of the flat material plate 6 extend out of the two sides of the conveyor belt 3. The flat material plate 6 is located above the storage box 1. The screening mechanism 7 is installed outside the storage box 1. The output end of the conveyor belt 3 extends into the input end of the screening mechanism 7. The screening mechanism 7 screens white corundum.

[0023] During operation, the feeding amount of the feeding mechanism 2 is set to be greater than the feeding amount of the screening mechanism 7. The white corundum is stored in the storage box 1. The feeding mechanism 2 is operated to transport the white corundum to the input end of the conveyor belt 3. The conveyor belt 3 transports the white corundum to the screening mechanism 7. When the white corundum passes through the flat plate 6, the flat plate 6 smoothes the white corundum and scrapes the excess white corundum back into the storage box 1, so that the thickness of the white corundum on the conveyor belt 3 passing through the flat plate 6 is consistent, thereby realizing uniform quantitative feeding to the screening mechanism 7. The feeding amount of the screening mechanism 7 is not affected by the depth of the white corundum in the storage box 1, so that the screening rate of the screening mechanism 7 is stable.

[0024] Example 2

[0025] like Figure 3 and Figure 4As shown, on the basis of Example 1, the feeding mechanism 2 includes a motor 8, a driving shaft 9, two driving sprockets 10, a supporting shaft 11, two driven sprockets 12, two chains 13 and a plurality of hoppers 14, the motor 8 is installed outside the storage box 1, the output shaft of the motor 8 is transmission-connected with the driving shaft 9, the driving shaft 9 is rotatably installed in the storage box 1, the two driving sprockets 10 are concentrically installed on the driving shaft 9, the supporting shaft 11 is rotatably installed on the storage box 1 through a bracket, the two driven sprockets 12 are concentrically installed on the supporting shaft 11, one end of the two chains 13 is respectively mounted on the two driving sprockets 10, the other end of the two chains 13 is respectively mounted on the two driven sprockets 12, and a plurality of hoppers 14 are evenly installed outside the two chains 13. side; it also includes a sleeve 15 and a plurality of stirring rods 16, the sleeve 15 is sleeved on the drive shaft 9, and the plurality of stirring rods 16 are evenly installed on the outer wall of the sleeve 15; it also includes a slide bar 17, two auxiliary rods 18, two bearings 19 and two cams 20, the sleeve 15 is slidably sleeved with the spline groove on the outer wall of the drive shaft 9 through a spline, the slide bar 17 is installed on the storage box 1, the upper ends of the two auxiliary rods 18 are slidably connected with the slide bar 17, the lower ends of the two auxiliary rods 18 are both installed with bearings 19, the two bearings 19 are sleeved on both ends of the sleeve 15, and the two cams 20 are rotatably installed on the two auxiliary rods 18 respectively, the wheel surfaces of the two cams 20 are respectively in rolling contact with the inner end surfaces of the two active sprockets 10, and the two cams 20 are arranged in a matrix.

[0026] Two driving sprockets 10 and two driven sprockets 12 support two chains 13, the motor 8 drives the driving shaft 9 to rotate, the driving shaft 9 drives the two driving sprockets 10 to rotate, the two driving sprockets 10 drive the two chains 13 to rotate, and the two chains 13 drive multiple hoppers 14 to rotate, so that the multiple hoppers 14 take out white corundum from the storage box 1 in turn and put it on the input end of the conveyor belt 3 to achieve efficient feeding. When the driving shaft 9 rotates, it drives the sleeve 15 and multiple stirring rods 16 to rotate, and the multiple stirring rods 16 stir the white corundum in the storage box 1 to prevent the white corundum from being hardened. When the two driving sprockets 10 are driven to rotate by the two driving sprockets 10, the two driving sprockets 10 respectively drive the two cams 20 to rotate by friction. Since the two cams 20 are arranged in a matrix, when the protruding portion of one cam 20 rolls with one driving sprocket 10, the contracted portion of the other cam 20 rolls with the other driving sprocket 10, thereby driving the sleeve 15 to move left and right along the driving shaft 9 through the two auxiliary rods 18 and the two bearings 19. The sliding rod 17 guides the upper ends of the two auxiliary rods 18, so that the sleeve 15 and the multiple stirring rods 16 can be rotated and moved left and right at the same time, thereby improving the stirring effect.

[0027] Example 3

[0028] like Figure 5 and Figure 6As shown, on the basis of Example 1, the screening mechanism 7 includes a mounting frame 21, a sieve plate 22 and a paving plate 23, the sieve plate 22 is mounted in the mounting frame 21, the sieve plate 22 is arranged obliquely, the upper end of the sieve plate 22 is located below the output end of the conveyor belt 3, the two ends of the paving plate 23 are rotatably connected to the two sides of the mounting frame 21 through an axle rod, and a gap is set between the lower end of the paving plate 23 and the sieve plate 22; it also includes a baffle 24 and two arc-shaped grooves 25, the upper part of the sieve plate 22 is provided with fine sieve holes, the lower part of the sieve plate 22 is provided with coarse sieve holes, and the lower end of the baffle 24 is rotatably connected to the connection between the upper and lower parts of the sieve plate 22 Arc grooves 25 are arranged on both sides of the mounting frame 21, and both sides of the baffle 24 are respectively inserted in the two arc grooves 25 through screws, and two nuts are screwed on the two screws of the baffle 24 for locking; it also includes two springs 26, two swing arms 27 and two pull rods 28. The two sides of the lower end of the storage box 1 are elastically mounted on the machine base through two springs 26, the inner ends of the two swing arms 27 are connected to the two ends of the rotating shaft of the output roller of the conveyor belt 3, the upper ends of the two pull rods 28 are respectively rotatably connected to the outer ends of the two swing arms 27, and the lower ends of the two pull rods 28 are respectively rotatably connected to the two sides of the upper end of the mounting frame 21.

[0029] The paving plate 23 intercepts the white corundum on the sieve plate 22, and transports the white corundum downward through the gap between the paving plate 23 and the sieve plate 22, so that the white corundum is spread flat on the sieve plate 22. The angle of the paving plate 23 is adjusted to change the size of the above gap to adapt to different feed amounts. Multi-stage screening is achieved by setting fine sieve holes and coarse sieve holes on the sieve plate 22. The position of the screw of the baffle 24 is adjusted along the two arc grooves 25, and the angle of the baffle 24 is adjusted so that the baffle 24 blocks the white corundum on the upper part of the sieve plate 22, so that the white corundum enters the lower part for further screening after being fully screened. The output roller shaft of the conveyor belt 3 drives the two swing arms 27 to rotate, and the two swing arms 27 drive the two pull rods 28 to pull the upper end of the mounting frame 21 to reciprocate and rise and fall. Under the elastic support of the two springs 26, the sieve plate 22 vibrates to increase the screening speed.

[0030] like Figures 1 to 6As shown, the utility model is a white corundum screening device with uniform feeding. When it is working, the white corundum is first stored in the storage box 1, and the feeding mechanism 2 is operated to transport the white corundum to the input end of the conveyor belt 3, and the conveyor belt 3 transports the white corundum to the screening mechanism 7. After that, when the white corundum passes through the flat material plate 6, the flat material plate 6 smoothes the white corundum and scrapes the excess white corundum back into the storage box 1, so that the thickness of the white corundum on the conveyor belt 3 passing through the flat material plate 6 is consistent, and uniform quantitative feeding to the screening mechanism 7 is achieved, and then the output roller of the conveyor belt 3 drives the two swing arms 27 to rotate, and the two swing arms 27 drive The two pull rods 28 pull the upper end of the mounting frame 21 to move up and down reciprocatingly. Under the elastic support of the two springs 26, the sieve plate 22 vibrates, and the paving plate 23 intercepts the white corundum on the sieve plate 22, so that the white corundum is transported downward through the gap between the paving plate 23 and the sieve plate 22, so that the white corundum is spread flat on the sieve plate 22. Fine sieve holes and coarse sieve holes are arranged on the sieve plate 22 to realize multi-stage screening. Finally, the position of the screw of the baffle 24 is adjusted along the two arc grooves 25, and the angle of the baffle 24 is adjusted so that the baffle 24 blocks the white corundum on the upper part of the sieve plate 22, so that the white corundum can be fully screened and then enter the lower part for further screening.

[0031] The main functions achieved by this utility model are:

[0032] 1. It can evenly and quantitatively feed materials to the screen plate, and the feeding amount is not affected by the depth of corundum, so that the screening rate is stable;

[0033] 2. Capable of multi-level screening;

[0034] 3. Able to efficiently stir white jade;

[0035] 4. Able to adjust the feeding quantity.

[0036] The utility model is a kind of white corundum screening device with uniform feeding, and its installation method, connection method or setting method are all common mechanical methods, and can be implemented as long as it can achieve its beneficial effects; the storage box 1, feeding mechanism 2, conveyor belt 3, screw 5, screening mechanism 7, motor 8, driving sprocket 10, driven sprocket 12, chain 13, hopper 14, bearing 19, cam 20, screen plate 22, and spring 26 of the white corundum screening device with uniform feeding of the utility model are purchased on the market, and technical personnel in the industry only need to install and operate it according to the accompanying instruction manual, without the need for technical personnel in this field to pay creative labor.

[0037] All technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A white corundum screening device with uniform feeding, comprising a storage box (1); characterized in that: The invention also comprises a feeding mechanism (2), a conveyor belt (3), a door frame (4), two screw rods (5), a flat material plate (6) and a screening mechanism (7), wherein the feeding mechanism (2) is installed in a material storage box (1), the conveyor belt (3) is installed on the material storage box (1), the feeding mechanism (2) conveys the white corundum in the material storage box (1) to the input end of the conveyor belt (3), the door frame (4) is installed on the material storage box (1), the two screw rods (5) are rotatably screwed on the cross beam of the door frame (4), and the two screw rods (5) are screwed on the cross beam of the door frame (4). The lower end of the screw rod (5) is connected to a flat material plate (6), the flat material plate (6) is located above the middle of the conveyor belt (3), a gap is set between the lower end of the flat material plate (6) and the conveyor belt (3), the two ends of the flat material plate (6) extend out of the two sides of the conveyor belt (3), the flat material plate (6) is located above the material storage box (1), the screening mechanism (7) is installed outside the material storage box (1), the output end of the conveyor belt (3) extends into the input end of the screening mechanism (7), and the screening mechanism (7) screens white corundum.

2. A uniformly fed white corundum screening device as claimed in claim 1, characterized in that: The feeding mechanism (2) comprises a motor (8), a driving shaft (9), two driving sprockets (10), a supporting shaft (11), two driven sprockets (12), two chains (13) and a plurality of hoppers (14). The motor (8) is mounted outside the material storage box (1). The output shaft of the motor (8) is transmission-connected with the driving shaft (9). The driving shaft (9) is rotatably mounted in the material storage box (1). The two driving sprockets (10) are concentrically mounted on the driving shaft (9). The supporting shaft (11) is rotatably mounted on the material storage box (1) through a bracket. The two driven sprockets (12) are concentrically mounted on the supporting shaft (11). One end of the two chains (13) is respectively mounted on the two driving sprockets (10). The other ends of the two chains (13) are respectively mounted on the two driven sprockets (12). The plurality of hoppers (14) are evenly mounted on the outer sides of the two chains (13).

3. A uniformly fed white corundum screening device as claimed in claim 2, characterized in that: It also comprises a sleeve (15) and a plurality of stirring rods (16). The sleeve (15) is sleeved on the driving shaft (9), and the plurality of stirring rods (16) are evenly mounted on the outer wall of the sleeve (15).

4. A uniformly fed white corundum screening device as claimed in claim 3, characterized in that: The invention also comprises a slide bar (17), two auxiliary bars (18), two bearings (19) and two cams (20). The sleeve (15) is slidably mounted in a spline groove on the outer wall of a driving shaft (9) through a spline. The slide bar (17) is mounted on a material storage box (1). The upper ends of the two auxiliary bars (18) are slidably connected to the slide bar (17). The lower ends of the two auxiliary bars (18) are both equipped with bearings (19). The two bearings (19) are mounted on both ends of the sleeve (15). The two cams (20) are rotatably mounted on the two auxiliary bars (18). The wheel surfaces of the two cams (20) are respectively in rolling contact with the inner end surfaces of the two driving sprockets (10), and the two cams (20) are arranged in a matrix.

5. A uniformly fed white corundum screening device as claimed in claim 1, characterized in that: The screening mechanism (7) comprises a mounting frame (21), a sieve plate (22) and a paving plate (23). The sieve plate (22) is mounted in the mounting frame (21). The sieve plate (22) is arranged obliquely. The upper end of the sieve plate (22) is located below the output end of the conveyor belt (3). The two ends of the paving plate (23) are rotatably connected to the two sides of the mounting frame (21) through shaft rods respectively. A gap is set between the lower end of the paving plate (23) and the sieve plate (22).

6. A uniformly fed white corundum screening device as claimed in claim 5, characterized in that: The invention also comprises a baffle plate (24) and two arc-shaped grooves (25), the upper part of the sieve plate (22) is provided with fine sieve holes, the lower part of the sieve plate (22) is provided with coarse sieve holes, the lower end of the baffle plate (24) is in rotational contact with the connection between the upper part and the lower part of the sieve plate (22), the arc-shaped grooves (25) are provided on both sides of the mounting frame (21), the two sides of the baffle plate (24) are respectively inserted into the two arc-shaped grooves (25) by screw rods, and two nuts are screwed on the two screw rods of the baffle plate (24) for locking.

7. A uniformly fed white corundum screening device as claimed in claim 5, characterized in that: It also includes two springs (26), two swing arms (27) and two pull rods (28). The two sides of the lower end of the storage box (1) are elastically mounted on the machine base through the two springs (26). The inner ends of the two swing arms (27) are connected to the two ends of the rotating shaft of the output roller of the conveyor belt (3). The upper ends of the two pull rods (28) are respectively rotatably connected to the outer ends of the two swing arms (27). The lower ends of the two pull rods (28) are respectively rotatably connected to the two sides of the upper end of the installation frame (21).

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