CN117960560A - Screening device and method of mineral separation equipment - Google Patents

Abstract

The invention discloses a screening device and a screening method of mineral processing equipment, which relate to the field of mineral processing equipment and aim at solving the problems that ore is screened through middling and screen holes of a screen are blocked, and ore screening is not fine, and the mineral processing equipment comprises a base and an adjusting frame, wherein the base is hinged with the adjusting frame, a feed hopper is fixedly connected to the adjusting frame, a feed pipe is connected to an outlet at the lower end of the feed hopper, an ore screening cylinder is rotatably connected to the side edge of the feed pipe, the ore screening cylinder is arranged on the adjusting frame, a discharge box is rotatably connected to the other side of the ore screening cylinder, the discharge box is fixedly connected with the adjusting frame, and an ore storage box is arranged at the lower end of the discharge box, and the mineral processing equipment has the advantages that: through the rotation of ore screening section of thick bamboo, avoid the problem that the screen cloth blockked up among the screening process, improve ore screening's fineness, reduce the raise dust to all around when ore screening.

Description

Screening device and method of mineral separation equipment

Technical Field

The invention relates to the technical field of mineral processing equipment, in particular to a screening device and a screening method of mineral processing equipment.

Background

Screening refers to the operation of separating solid materials into desired particle sizes using screens of different mesh sizes. In the mining and metallurgy industry, screening is often matched with crushing, so that the particle sizes of crushed materials can be approximately equal, and the solid particles collected later are ensured to meet certain requirements. To meet this need in the mining and quarrying industries, unseparated ore is typically separated or screened with a vibrating screen deck having screening openings to enable passage of ore smaller than the openings.

Patent application number "CN201810240222.9" discloses: "an ore screener comprising a support comprising a base plate, a first support bar and a second support bar; the number of the transmission boxes is two, one end of the transmission boxes is fixed at the upper end of the first supporting rod, the other end of the transmission boxes is fixed at the upper end of the second supporting rod, and the two transmission boxes are symmetrically distributed; the transmission case comprises a shell, a cover body, an output wheel, a transmission belt and a compression wheel; the first screen bars are parallel to each other, the number of the first screen bars is the same as that of the output wheels in the single transmission case, and the two ends of the first screen bars are respectively fixed on the output shafts of the output wheels corresponding to the two transmission cases respectively; the second sieve rods are respectively parallel to the first sieve rods, the number of the second sieve rods is a plurality of the second sieve rods, the two ends of the second sieve rods are respectively fixed on the two transmission boxes, and the first sieve rods and the second sieve rods are both positioned on the same plane; and a driving device including a large gear, a small gear, and a driving motor. This application can divide the ore after the breakage and open, simultaneously through first sieve pole unidirectional rotation, drives the upset with the bulk ore, drops to the screening ware tip up to the upset, realizes the screening to big or small ore.

In this application first sieve pole is rotatory, take first sieve pole clockwise rotation as the example, first sieve pole can have outside tangential force to the ore lump of card upside, but have inside tangential force to the ore lump of card in first sieve pole downside, be unfavorable for the whereabouts of ore, still the possibility of card ore in the use, the device can only carry out one-level screening through first sieve pole and second sieve pole in addition, the ore screening is too coarse, the whereabouts of ore in screening process can be accelerated in the rotation of first sieve pole and the slope of device are placed, the ore screening is not thorough, and at screening in-process pivoted first sieve pole and rolling ore contact, operational noise is great, first sieve pole receives frequent collision, its life can shorten.

Disclosure of Invention

Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the screening device and the screening method of the mineral separation equipment, and the problems that ore is screened through the sieve holes of the middling and the blocking sieve mesh and ore screening is not fine are effectively solved through the design.

In order to achieve the above purpose, the present invention provides the following technical solutions: the ore screening device comprises a base and an adjusting frame, wherein the base is hinged with the adjusting frame, a feed hopper is fixedly connected to the adjusting frame, a feed pipe is connected to an outlet at the lower end of the feed hopper, an ore screening cylinder is rotatably connected to the side edge of the feed pipe, the ore screening cylinder is arranged on the adjusting frame, a discharging box is rotatably connected to the other side of the ore screening cylinder, the discharging box is fixedly connected with the adjusting frame, and an ore storage box is arranged at the lower end of the discharging box;

The ore screening cylinder comprises a first-stage screen, a second-stage screen, an outer sleeve, a fixing frame and a driving device, wherein the outer sleeve is fixedly connected with the fixing frame, the fixing frame is fixedly connected with the adjusting frame, the first-stage screen and the second-stage screen are rotatably installed on the adjusting frame, the first-stage screen and the second-stage screen are synchronously driven by the driving device, the first-stage screen is communicated with the feeding pipe, the first-stage screen is rotatably connected to the inner side of the second-stage screen, a first-stage ore storage cavity is formed in the first-stage screen, a first discharge hole is formed in the side of the first-stage ore storage cavity, the inner diameter of the second-stage screen is larger than the aperture of the first-stage screen, a second discharge hole is formed in the side of the second-stage ore storage cavity, the aperture of the outer sleeve is larger than the aperture of the second-stage screen, a third-stage ore storage cavity is formed in the side of the outer sleeve, and a third discharge hole is formed in the side of the third-stage ore storage cavity;

The discharging box comprises a first discharging pipe, a second discharging pipe and a third discharging pipe, the first discharging pipe is positioned at the side edge of the first discharging hole, the lower ends of the first discharging pipe and the second discharging pipe are bent in the direction away from the ore sorting barrel, the second discharging pipe is positioned under the second discharging hole, and the third discharging pipe is positioned under the third discharging hole;

The ore storage box is internally provided with a first storage cavity, a second storage cavity and a third storage cavity which correspond to the first discharging pipe, the second discharging pipe and the third discharging pipe respectively.

Preferably, the length of one-level screen cloth is greater than the length of second grade screen cloth, the first baffle of one end fixedly connected with of one-level screen cloth, the other end fixedly connected with first baffle of one-level screen cloth, the first baffle outside is equipped with first support, first support with one-level screen cloth rotates to be connected, first support with the alignment jig rotates to be connected, the length of second grade screen cloth is greater than the length of outer sleeve, second baffle of second grade screen cloth one end fixedly connected with, the other end fixedly connected with second baffle of second grade screen cloth, the second baffle outside is equipped with the second support, the second support with second screen cloth rotates to be connected, between the second with alignment jig fixed connection.

Preferably, the driving device comprises a driving gear, the driving gear is mounted on the adjusting frame, the driving gear is meshed with a first gear, the first gear is fixedly connected with the first-stage screen, the first gear is rotationally connected with a transmission gear, the transmission gear is rotationally connected with the adjusting frame, a second gear is meshed with the outer side of the transmission gear, and the second gear is fixedly connected with the second baffle.

Preferably, the side edges of the first bracket and the second bracket are fixedly connected with an anti-overflow plate, and the anti-overflow plate is positioned above the second discharge hole and the third discharge hole.

Preferably, the spill plate is of a semi-cylindrical structure.

Preferably, the feeder hopper is a funnel structure with a round upper part and a round lower part, and the feeder hopper is fixed on the adjusting frame through a supporting rod.

Preferably, the adjusting frame is hinged with a telescopic rod, and the other end of the telescopic rod is hinged with the base.

Preferably, the front sides of the first discharging pipe and the second discharging pipe are fixedly connected with connecting rods, and curtain plates are rotatably connected to the connecting rods.

Preferably, the first storage cavity, the second storage cavity and the third storage cavity are distributed in a stepped mode, the first storage cavity and the bottom of the second storage cavity are vibration sieve plates, the sieve holes of the vibration sieve plates at the bottom of the first storage cavity are the same as the sieve holes of the primary sieve plates, and the sieve holes of the vibration sieve plates at the bottom of the second storage cavity are the same as the sieve holes of the secondary sieve plates

Preferably, the crushed ore is thrown into the feed hopper through the feeder, the ore in the feed hopper enters into the one-stage screen cloth of the ore screening cylinder through the feed pipe, the one-stage screen cloth rotates under the action of the driving device, the ore in the one-stage screen cloth is under the action of centrifugal force and gravity, the ore smaller than the screen holes of the one-stage screen cloth can enter into the second-stage screen cloth, under the action of the driving device, the second-stage screen cloth is also rotating, the ore smaller than the screen holes of the second-stage screen cloth is separated into the outer sleeve by means of the same principle, the base is horizontally installed, the adjusting frame adjusts the ore screening cylinder on the base to the height of the feeding position higher than the height of the discharging position, the ore separated from the first discharging hole, the second discharging hole and the third discharging hole in the ore screening cylinder flows out respectively, and the flowed ore is separately stored through the first storage cavity, the second storage cavity and the third storage cavity of the ore storage box.

Compared with the prior art, the invention has the outstanding advantages that:

According to the invention, the ore screening cylinder is divided into three different ore storage cavities through the first-stage screen and the second-stage screen, the ore is classified into a large type, a medium type and a small type according to the size of the ore, the ore is more finely separated, the angle of the adjusting frame can be randomly adjusted, and the separated ore is convenient to fall under the action of the inclination of the adjusting frame.

The primary screen and the secondary screen in the invention screen ores in a rotating mode, but when the sharp ends of the ores are blocked in the screen holes, after the first-stage screen mesh and the second-stage screen mesh drive the screen mesh clamping the ore to revolve for one hundred eighty degrees, the tip end of the ore is positioned on the upper side of the other end of the ore, the ore can fall under the action of gravity, and the condition that the ore clamps the screen mesh is avoided.

According to the invention, ore screening is completed in the ore screening cylinder, and the outer sleeve is closed, so that the problem of overlarge dust emission of the ore in the separation process can be effectively avoided.

Drawings

Fig. 1 is a schematic view of a first axial side structure of embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of the left-side forward structure of embodiment 1 of the present invention.

Fig. 3 is a schematic diagram of a second axial side structure of embodiment 1 of the present invention.

Fig. 4 is a schematic diagram of a connection structure of a driving device according to the present invention.

FIG. 5 is a schematic diagram of the exploded view of the first ore screening cartridge of the present invention.

FIG. 6 is a schematic cross-sectional view of an ore screening cartridge of the present invention.

FIG. 7 is a schematic view of the feed pipe connection structure of the present invention.

Fig. 8 is a schematic diagram of a connection structure between an adjusting rack and a fixing rack of the invention.

Fig. 9 is a schematic view of the bottom end structures of the first bracket and the second bracket according to the present invention.

FIG. 10 is a schematic view of the connection structure of the base and the adjusting frame of the present invention.

Fig. 11 is a schematic view showing the axial side structure of the discharging box and the ore receiving box in example 1 of the present invention.

Fig. 12 is a left side schematic view of the discharge box and the ore storage box in embodiment 1 of the present invention.

Fig. 13 is a schematic view of a connection structure of a discharge box according to the present invention.

FIG. 14 is a schematic top view of an ore screening cartridge of the present invention.

Fig. 15 is a schematic view of the axial side structure of embodiment 2 of the present invention.

Fig. 16 is a schematic view showing the left side structure of the discharging box and the ore receiving box in embodiment 2 of the present invention.

Reference numerals in the drawings: 1. a base; 2. an adjusting frame; 3. a feed hopper; 4. a feed pipe; 5. an ore screening cylinder; 501. a first-stage screen; 502. a second-stage screen; 503. an outer sleeve; 504. a fixing frame; 505. a first discharge port; 506. a second discharge port; 507. a third discharge port; 508. a driving device; 5081. a drive gear; 5082. a first gear; 5083. a transmission gear; 5084. a second gear; 6. a discharge box; 601. a first discharge pipe; 602. a second discharge pipe; 603. a third discharge pipe; 7. an ore storage box; 701. a first receiving chamber; 702. a second receiving chamber; 703. a third receiving chamber; 8. a first baffle; 9. a first separator; 10. a first bracket; 11. a second baffle; 12. a second separator; 13. a second bracket; 14. an anti-overflow plate; 15. a support rod; 16. a telescopic rod; 17. a connecting rod; 18. curtain plate; 19. vibrating the screen plate.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

Referring to fig. 1-14, a screening device and a screening method for a mineral processing apparatus according to this embodiment: including base 1 and alignment jig 2, base 1 with alignment jig 2 articulates, fixedly connected with feeder hopper 3 on the alignment jig 2, the exit of feeder hopper 3 lower extreme is connected with inlet pipe 4, 4 sides of inlet pipe rotate and are connected with ore screening section of thick bamboo 5, ore screening section of thick bamboo 5 is installed on alignment jig 2, the opposite side of ore screening section of thick bamboo 5 rotates and is connected with ejection of compact box 6, ejection of compact box 6 with alignment jig 2 fixed connection, the lower extreme of ejection of compact box 6 is equipped with ore receiver 7.

The base 1 is located the bottommost of device, be equipped with mount pad and mounting hole on the base 1, through mount pad and mounting hole with the base 1 of device fixed, the alignment jig 2 is located base 1 top, alignment jig 2 one end rotates with base 1 to be connected, the alignment jig 2 other end is equipped with the lifting piece, the horizontal height of the alignment jig 2 other end is driven through the lifting piece, thereby make the inclination of alignment jig 2 change, can change the inclination of ore screening section of thick bamboo 5 through alignment jig 2, adjust the speed that ore falls in the ore screening section of thick bamboo 5, the ore of sorting enters into the feeder hopper 3 from the upside opening part of feeder hopper 3 in, enter into in the ore screening section of thick bamboo 5 through inlet pipe 4 in the feeder hopper 3, inlet pipe 4 rotates with ore screening section of thick bamboo 5 to be connected, enter into ore screening section of thick bamboo 5 in from inlet pipe 4, carry out tertiary screening under the effect of ore screening section of thick bamboo 5, ore after the screening passes through discharge box 6 whereabouts to in the ore receiver 7, thereby further ore is piled up in order to avoid in the feeder hopper 3, can install the impeller in order to avoid in the feeder hopper 3, when the ore is loaded into the impeller in the feeder hopper 3, the feed is guaranteed to the ore is down.

The ore screening section of thick bamboo 5 includes one-level screen cloth 501, second grade screen cloth 502, outer sleeve 503, mount 504 and drive arrangement 508, outer sleeve 503 with mount 504 fixed connection, mount 504 with alignment jig 2 fixed connection, one-level screen cloth 501 and second grade screen cloth 502 rotate and install on alignment jig 2, one-level screen cloth 501 with second grade screen cloth 502 passes through drive arrangement 508 and drives in step, one-level screen cloth 501 with inlet pipe 4 communicates, one-level screen cloth 501 rotates the inboard of connecting at second grade screen cloth 502, one-level screen cloth 501 inside constitutes one-level ore storage chamber, and one-level ore storage chamber side is equipped with first discharge gate 505, the internal diameter of second grade screen cloth 502 is greater than the aperture of one-level screen cloth 501, second grade ore storage chamber side is equipped with second discharge gate 506, the aperture of outer sleeve 503 is greater than the aperture of second grade screen cloth 502, the space between two-level screen cloth 502 constitutes three-level ore storage chamber, and three-level ore storage chamber side is equipped with third discharge gate 507.

The primary screen cloth 501 and the secondary screen cloth 502 in the ore screening cylinder 5 are used for screening ores twice, the primary screen cloth 501 and the secondary screen cloth 502 are of cylindrical structures, the sieve holes of the primary screen cloth 501 are larger than those of the secondary screen cloth 502, ores entering the ore screening cylinder 5 through connecting pipes enter first primary ore storage cavities inside the primary screen cloth 501, the primary screen cloth 501 drives the ores in the primary ore storage cavities to roll under the rotating action of the primary screen cloth 501, the ores in the primary ore storage cavities are smaller than those of the primary screen cloth 501 in the rolling process and fall into the secondary ore storage cavities formed by the outer portions of the primary screen cloth 501 and the inner portions of the secondary screen cloth 502, the principle of the primary screen cloth 501 is the same, and the secondary screen cloth 502 rotates to screen smaller ores into the outer sleeve 503, namely the tertiary ore storage cavities formed by the outer sleeve 503 and the secondary screen cloth 502; because the specification of ore when the breakage is different, this type of ore of finer point and coarser tail end can appear, can cause the jam of sieve mesh when the ore point is less than the sieve mesh and the tail end is greater than the sieve mesh, first order screen cloth 501 and second grade screen cloth 502 are through rotating, can rotate one hundred eighty degrees with the ore of card at the sieve mesh, make the ore point reverse to tail end upper portion, drop down at gravity effect ore, effectually avoid the jam of sieve mesh, the rotation of first order screen cloth 501 also avoids the ore of second grade ore storage intracavity to fall back to the first order ore storage intracavity in higher position department simultaneously, the ore screening section of thick bamboo 5 selects barrel structure to use can effectually avoid the dust of ore screening in-process to outwards raise, ensure surrounding working environment, reduce the influence to the environment.

The discharging box 6 comprises a first discharging pipe 601, a second discharging pipe 602 and a third discharging pipe 603, the first discharging pipe 601 is located on the side edge of the first discharging hole 505, the first discharging pipe 601 and the lower end of the second discharging pipe 602 are bent towards the direction away from the ore sorting barrel, the second discharging pipe 602 is located under the second discharging hole 506, the third discharging pipe 603 is located under the third discharging hole 507, and a first containing cavity 701, a second containing cavity 702 and a third containing cavity 703 which correspond to the first discharging pipe 601, the second discharging pipe 602 and the third discharging pipe 603 respectively are arranged in the ore containing box 7.

First discharging pipe 601 in the discharge box 6, second discharging pipe 602 and third discharging pipe 603 have corresponding respectively the first chamber 701 of accomodating of ore receiver 7, second chamber 702 and third chamber 703 of accomodating, and the width that chamber 701 is accomodate to first chamber 701, second chamber 702 and third chamber 703 are accomodate to the third is all greater than first discharging pipe 601, second discharging pipe 602 and third discharging pipe 603, when regulating frame 2 rotates, discharge box 6 can rotate along with regulating frame 2, the opening design of first chamber 701, second chamber 702 and third chamber 703 is accomodate to the second is great, the collection of ore of being convenient for, simultaneously after regulating frame 2 rotates, still the guarantee can receive the ore that comes from discharge box 6 to drop.

Further, in order to improve the stability of the screening cylinder and facilitate the discharging of the screening cylinder, the length of the primary screen cloth 501 is greater than that of the secondary screen cloth 502 and is greater than that of the outer sleeve 503, the outer sleeve 503 is installed on the adjusting frame 2 through the fixing frame 504, one ends of the primary screen cloth 501 and the secondary screen cloth 502 are supported through sleeve heads, meanwhile, in order to ensure tightness, a first baffle 8 is arranged between the left end part of the primary screen cloth 501 and the secondary screen cloth 502, a second baffle 11 is arranged between the left end part of the secondary screen cloth 502 and the outer sleeve 503, a first baffle 9 is arranged on the right side of the primary screen cloth 501, a first support 10 is installed on the first baffle 9, a supporting effect is achieved on the right end of the primary screen cloth 501 by the support, meanwhile, the first baffle 9 avoids ore powder from entering into a gap between the first support 10 and the primary screen cloth 501, and the same principle of action of the second support 13 and the second baffle 12 on the secondary screen cloth 502.

The driving motor is installed on the driving gear 5081, the driving gear 5081 is driven to rotate during operation of the driving motor, the driving gear 5081 drives the first gear 5082 to rotate, the first gear 5082 drives the first-stage screen 501 to rotate, the first gear 5082 rotates to drive the transmission gear 5083 to rotate, the second gear 5084 is an internal gear, the rotation of the transmission gear 5083 drives the second gear 5084 to rotate, and the second gear 5084 drives the second-stage screen 502 to rotate through the second baffle 11.

The opening of third discharging pipe 603 and second discharging pipe 602 is located the lower half of ore screening section of thick bamboo 5, and for better collecting the ore of second discharge gate 506 and third discharge gate 507 department of ore screening section of thick bamboo 5, all be equipped with spill-proof plate 14 in the left side of first support 10 and second support 13 for stop the excessive of second discharge gate 506 and third discharge gate 507 department ore, guarantee that the ore is smooth to drop to corresponding discharging intraductal.

The telescopic link 16 between alignment jig 2 and base 1 is hydraulic telescopic link 16, is equipped with hydraulic pump and controller on the base 1, changes the inclination of alignment jig 2 through the flexible volume of adjusting telescopic link 16, as shown in fig. 10, after telescopic link 16 length is prolonged, alignment jig 2 left side upward slope, and the ore in the ore screening section of thick bamboo 5 of alignment jig 2 upside has great gravity component this moment, and the speed of ore whereabouts can accelerate, and reverse alignment telescopic link 16 result is opposite.

First discharging pipe 601 and second discharging pipe 602 front side have the buckling structure, in order to avoid the ore to fly in disorder, guarantee ore is stable to fall into corresponding ore receiver 7 in, is equipped with connecting rod 17 and curtain board 18 at first discharging pipe 601 and second discharging pipe 602 front side, and curtain board 18 can use the cloth, plays fine cushioning effect to the ore that flies out, and curtain board 18 and connecting rod 17's rotation can be guaranteed curtain board 18 and be in the vertical state all the time simultaneously.

Example 2

As with the structure of the above-described embodiment, as shown in fig. 15 and 16, the present embodiment is specifically different in that: in order to improve screening effect of the device, the height of the first storage cavity 701 in the ore storage box 7 is higher than that of the second storage cavity 702, meanwhile, the height of the second storage cavity 702 is higher than that of the third storage cavity 703, the bottoms of the first storage cavity 701 and the second storage cavity 702 are provided with the vibration screen plate 19, and the vibration screen plate 19 carries out secondary screening on ores in the ore storage box 7, so that the screening fineness of the device is improved.

The whole working flow of the invention is as follows: during the use, adjust the alignment jig 2 to corresponding inclination, put into feeder hopper 3 through the feeder with the ore after the breakage, the ore in the feeder hopper 3 enters into the one-level screen cloth 501 of ore screening section of thick bamboo 5 through inlet pipe 4, one-level screen cloth 501 rotates under the effect of drive arrangement 508, the ore in one-level screen cloth 501 is under centrifugal force and gravity's effect, the ore that is less than one-level screen cloth 501 sieve mesh can enter into second screen cloth 502, under drive arrangement 508's effect, second screen cloth 502 is also rotating, rely on the same principle to separate the ore that is less than second screen cloth 502 sieve mesh into outer sleeve 503, ore screening section of thick bamboo 5 divides into big, middle and small triples, the biggest ore enters into first storage chamber 701 through first discharging pipe 601 from first discharging port 505 from the right side of one-level screen cloth 501, the ore between second screen cloth 502 and the one-level screen cloth 501 enters into second storage chamber 702 through second discharging pipe 602 from second discharging port 506, the ore between outer sleeve 503 and the second screen cloth 502 enters into third storage chamber 603 through third discharging pipe 603, thereby take in first storage chamber 703, take in the first storage chamber 703 and take in the first storage chamber 703 separately.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.

Claims (10)

1. A screening plant of mineral processing apparatus, its characterized in that: the ore screening device comprises a base (1) and an adjusting frame (2), wherein the base (1) is hinged to the adjusting frame (2), a feed hopper (3) is fixedly connected to the adjusting frame (2), a feed pipe (4) is connected to an outlet at the lower end of the feed hopper (3), an ore screening cylinder (5) is rotatably connected to the side edge of the feed pipe (4), the ore screening cylinder (5) is arranged on the adjusting frame (2), a discharge box (6) is rotatably connected to the other side of the ore screening cylinder (5), the discharge box (6) is fixedly connected with the adjusting frame (2), and an ore storage box (7) is arranged at the lower end of the discharge box (6);

The ore screening cylinder (5) comprises a first-stage screen (501), a second-stage screen (502), an outer sleeve (503), a fixing frame (504) and a driving device (508), wherein the outer sleeve (503) is fixedly connected with the fixing frame (504), the fixing frame (504) is fixedly connected with the adjusting frame (2), the first-stage screen (501) and the second-stage screen (502) are rotationally arranged on the adjusting frame (2), the first-stage screen (501) and the second-stage screen (502) are synchronously driven by the driving device (508), the first-stage screen (501) is communicated with the feeding pipe (4), the first-stage screen (501) is rotationally connected to the inner side of the second-stage screen (502), a first discharge hole (505) is formed in the inner side of the first-stage screen (501), the inner diameter of the second-stage screen (502) is larger than the aperture of the first-stage screen (501), a gap between the second-stage screen (502) and the second-stage screen (502) is formed by the second-stage screen (503), a gap between the second-stage screen (502) and the second-stage screen (503), a third discharge hole (507) is arranged at the side edge of the three-stage ore storage cavity;

The discharging box (6) comprises a first discharging pipe (601), a second discharging pipe (602) and a third discharging pipe (603), the first discharging pipe (601) is positioned on the side edge of the first discharging hole (505), the lower ends of the first discharging pipe (601) and the second discharging pipe (602) are bent towards the direction away from the ore sorting barrel, the second discharging pipe (602) is positioned under the second discharging hole (506), and the third discharging pipe (603) is positioned under the third discharging hole (507);

The ore storage box (7) is internally provided with a first storage cavity (701), a second storage cavity (702) and a third storage cavity (703) which respectively correspond to the first discharging pipe (601), the second discharging pipe (602) and the third discharging pipe (603).

2. A screening device of a beneficiation plant in accordance with claim 1, wherein: the length of one-level screen cloth (501) is greater than the length of second grade screen cloth (502), the one end fixedly connected with first baffle (8) of one-level screen cloth (501), the other end fixedly connected with first baffle (9) of one-level screen cloth (501), first baffle (9) outside is equipped with first support (10), first support (10) with one-level screen cloth (501) rotate to be connected, first support (10) with alignment jig (2) rotate to be connected, the length of second grade screen cloth (502) is greater than the length of outer sleeve (503), the other end fixedly connected with second baffle (11) of second grade screen cloth (502), the other end fixedly connected with second baffle (12) of second screen cloth (502), second support (13) are equipped with in the outside, second support (13) with second grade screen cloth (502) rotate to be connected, between the second with alignment jig (2) fixedly connected.

3.A screening device of a beneficiation plant in accordance with claim 2, wherein: the driving device (508) comprises a driving gear (5081), the driving gear (5081) is arranged on the adjusting frame (2), the driving gear (5081) is meshed with a first gear (5082), the first gear (5082) is fixedly connected with the primary screen (501), the first gear (5082) is rotationally connected with a transmission gear (5083), the transmission gear (5083) is rotationally connected with the adjusting frame (2), a second gear (5084) is meshed with the outer side of the transmission gear (5083), and the second gear (5084) is fixedly connected with the second baffle (11).

4. A screening device of a beneficiation plant in accordance with claim 2, wherein: the anti-overflow plate (14) is fixedly connected to the sides of the first support (10) and the second support (13), and the anti-overflow plate (14) is located above the second discharge hole (506) and the third material hole.

5. A screening device of a beneficiation plant in accordance with claim 4, wherein: the spill plate (14) is of a semi-cylindrical structure.

6. A screening device of a beneficiation plant in accordance with claim 1, wherein: the feeding hopper (3) is of a funnel structure with a round top and a round bottom, and the feeding hopper (3) is fixed on the adjusting frame (2) through a supporting rod (15).

7. A screening device of a beneficiation plant in accordance with claim 1, wherein: the adjusting frame (2) is hinged with a telescopic rod (16), and the other end of the telescopic rod (16) is hinged with the base (1).

8. A screening device of a beneficiation plant in accordance with claim 1, wherein: the front sides of the first discharging pipe (601) and the second discharging pipe (602) are fixedly connected with a connecting rod (17), and a curtain plate (18) is rotatably connected to the connecting rod (17).

9. A screening device of a beneficiation plant in accordance with claim 1, wherein: the first cavity (701), the second cavity (702) and the third cavity (703) of accomodating are the echelonment and distribute, the first cavity (701) of accomodating with the bottom in cavity (702) is vibrations sieve (19) are accomodate to the second, the sieve mesh of vibrations sieve (19) in cavity (701) bottom is accomodate to the first sieve mesh aperture that accomodates cavity (701) bottom is the same with one-level screen cloth (501), the sieve mesh of vibrations sieve (19) in cavity (702) bottom is accomodate to the second sieve mesh aperture that is the same with second screen cloth (502).

10. A screening method of a beneficiation plant in accordance with claim 1, wherein: crushed ore is put into feeder hopper (3) through the feeder, ore in feeder hopper (3) enters into in one-level screen cloth (501) of ore screening section of thick bamboo (5) through inlet pipe (4), one-level screen cloth (501) rotates under the effect of drive arrangement (508), ore in one-level screen cloth (501) is under centrifugal force and gravity's effect, ore that is less than one-level screen cloth (501) sieve mesh can enter into in second screen cloth (502), under the effect of drive arrangement (508), second screen cloth (502) are also rotating, rely on the same principle to separate the ore that is less than second screen cloth (502) sieve mesh into in outer sleeve (503), base (1) horizontal installation, adjust frame (2) are with ore screening section of thick bamboo (5) on base (1) highly be higher than the height of ejection of compact department, ore that the separation was located in ore screening section of thick bamboo (5) is separated respectively from first discharge gate (505), second discharge gate (506) and third discharge gate (507), the ore that flows out is separated through first chamber (702), second chamber (703) and third chamber (703) of accomodating of receiver (7).