A classification vibrating screen and method for phosphate ore processing

Abstract

The present invention discloses a classification vibrating screen and method for phosphate ore processing. The classification vibrating screen includes a frame, a vibration source is arranged on the frame, and a sieve plate is also arranged on the frame. A screening surface is defined on the sieve plate. The sieve plate includes a plate body, and a plurality of connection ports are formed on the plate body along the flow direction of the material. The sieve plate further includes screening members rotatably arranged below the plate body. There are a plurality of screening members, and the plurality of screening members are in one-to-one correspondence with the plurality of connection ports. The outer peripheral surface of the screening member constitutes a screening area, and the screening area is formed by a plurality of screening units arranged circumferentially. During the screening process, the rotation of the screening member can be controlled so that different screening units are spliced with the connection ports. Compared with the prior art, the sieve plate of the present invention is composed of a plate body and a plurality of screening members, and the relative position of different screening units and the connection ports can be switched online by rotating the screening members. For example, different screening units can have different screening particle sizes, so as to realize the dynamic adjustment of the screening effect.

Description

Technical Field

[0001] The present invention relates to the technical field of screening devices, and in particular, to a grading vibrating screen and method for phosphate ore processing. Background Art

[0002] The phosphate ore grading vibrating screen is a core device in phosphate ore processing. Through high-frequency vibration and multi-layer screen design, accurate particle size grading of the ore is achieved, and the screening accuracy can reach over 95%. It optimizes the material flow efficiency by using adjustable parameters (such as vibration frequency, screen surface inclination angle). This device is usually located between the crushing and grinding processes, which can increase the production capacity of the production line by 20% - 30% and reduce the energy consumption of the subsequent ball mill at the same time.

[0003] However, most of the screen diameters in the existing grading vibrating screens are fixed, that is, the screen plate needs to be manually replaced before the screening operation starts. On the one hand, the additional disassembly operation reduces the work efficiency, and on the other hand, it is impossible to perform online replacement of the screen during the vibrating screening process. Summary of the Invention

[0004] The first object of the present invention is to overcome the deficiencies of the prior art and provide a grading vibrating screen for phosphate ore processing.

[0005] The first object of the present invention is achieved by the following technical solutions:

[0006] A grading vibrating screen for phosphate ore processing includes a frame, a vibration source is arranged on the frame, a screen plate is also arranged on the frame, a screening surface is defined on the screen plate, the screen plate includes a plate body, a plurality of connection ports are opened on the plate body along the material flow direction, the screen plate further includes screening members rotatably arranged below the plate body, there are a plurality of the screening members, and the plurality of screening members are in one-to-one correspondence with the plurality of connection ports. The outer peripheral surface of the screening member constitutes a screening area, and the screening area is formed by a plurality of screening units arranged circumferentially. As the screening member rotates, one of the screening units is spliced at the connection port.

[0007] Preferably, the cross-section of the screening member is a regular polygon.

[0008] Preferably, the aperture diameters of the screening holes in each screening area are the same.

[0009] Preferably, the aperture diameters of the plurality of screening units on the same screening member are different.

[0010] Preferably, an elastic sheet is arranged at the opening of the connection port, and the elastic sheet overlaps on the screening unit.

[0011] Preferably, several of the screening units of the same screening member sequentially include a first screening unit, a second screening unit, and a third screening unit in the circumferential direction, wherein the pore sizes of the screening holes of the first screening unit and the second screening unit are the same, and the pore size of the screening holes of the third screening unit is larger than that of the second screening unit; a driving device for driving the screening member to rotate is provided on the frame.

[0012] Preferably, the pore size of the screening holes of the third screening unit is 1.2 - 1.5 times that of the second screening unit.

[0013] Preferably, several of the screening units of the same screening member further include a fourth screening unit circumferentially joined to the rear side of the third screening unit, and the pore sizes of the screening holes of the third screening unit and the fourth screening unit are the same.

[0014] Preferably, the driving device includes a rotating shaft rotatably arranged beside the screen plate, and a driving shaft is rotatably arranged at the discharge end of the screen plate, and a bevel gear mechanism is transmitted between the driving shaft and the rotating shaft, and a driving blade is provided on the side wall of the driving shaft, and the driving blade is adapted to drive the driving shaft and the rotating shaft to rotate under the push of the material; a driving mechanism is provided on the rotating shaft corresponding to each of the screening elements, and the driving mechanism includes a first gear and a second gear sleeved on the rotating shaft, and a gear ring is provided at the end of the screening element, and the first gear and the second gear are both meshed with the gear ring; the driving mechanism also includes an engaging ring connected to the rotating shaft by a spline and located between the first gear and the second gear, and there are two engaging rings opposite to each other, and a first air bag is provided between the two engaging rings; a separation cylinder is provided below several of the screening units of each of the screening elements, and the outer top surface of the separation cylinder is adapted to form a separation screen, and the aperture of the sieve hole of the separation screen is the same as the aperture of the sieve hole of the screening unit 2 of the previous screening element, and the The outer top surface of the separation cylinder is inclined to guide the corresponding materials to be discharged from the first direction; the inner bottom surface of the separation cylinder is inclined to guide the corresponding materials to be discharged from the second direction, the end of the separation cylinder is elastically connected to a push plate, and a second air bag is provided on the frame beside the push plate, and the second air bag is connected to the first air bag corresponding to the previous screening element through a pipe; a mounting bracket is provided on the frame beside the first air bag, and two abutment rods are elastically provided on the mounting bracket. When viewed from the axial direction of the rotating shaft, the two The coupling ring is located between the two abutment rods, the top surface of the separation cylinder can be elastically arranged along the material receiving direction, and a wedge surface structure is adapted between the end of the top surface of the separation cylinder and the two abutment rods. As the separation cylinder elastically moves, one of the two abutment rods extends toward one side of the coupling ring, and the other of the two abutment rods is retracted away from the side of the coupling ring; when the material in the separation cylinder exceeds the threshold, the push plate is ejected and squeezes the second airbag, and then the first airbag expands and pushes the coupling ring into the coupling position.

[0015] The second object of the present invention is to overcome the deficiencies of the prior art and provide a grading vibrating screen for phosphate rock processing.

[0016] The second object of the present invention is achieved through the following technical solutions:

[0017] A grading vibration screening method for phosphate rock processing, comprising the above-mentioned grading vibration screen for phosphate rock processing, and further comprising the following steps:

[0018] S1. Add the material from the feeding end of the sieve plate;

[0019] S2. Control the rotation of the screening member according to the screening situation to drive different screening units to be spliced at the connection port.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. During the screening process, the rotation of the screening member can be controlled so that different screening units are spliced with the connection port. Compared with the prior art, the sieve plate of the present invention is composed of a plate body and several screening members, and by rotating the screening member, different screening units can be switched online to face the connection port. For example, different screening units can have different screening particle sizes, so as to realize the dynamic adjustment of the screening effect.

[0022] 2. The screening member has a variety of applicable forms. The first: the apertures of the screening holes of several screening units of the screening member are the same, so that the blocked screening unit can be replaced online; the second: the apertures of the screening holes of several screening units of the screening member are different, so that the screening effect on the material can be adjusted online; the third: the screening member has both screening units with the same aperture of the screening holes and screening units with different apertures of the screening holes, so that different screening units can be selectively controlled to face the connection port according to the specific screening situation during the screening process, and thus the use effects of the above first and second applicable forms can be selectively achieved. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the embodiment;

[0024] Figure 2 It is a schematic structural diagram of one form of the screening member;

[0025] Figure 3 It is a schematic structural diagram of another form of the screening member;

[0026] Figure 4 It is a top view structural diagram of the sieve plate;

[0027] Figure 5 It is a vertical sectional structural diagram of the separation cylinder;

[0028] Figure 6 It is a horizontal sectional structural diagram of the separation cylinder;

[0029] Figure 7 It is a schematic structural diagram of the driving mechanism;

[0030] Figure 8 It is a schematic structural diagram of the wedge surface structure.

[0031] Reference numerals: 1, frame; 2, sieve plate; 3, screening surface; 4, plate body; 5, connection port; 6, screening member; 7, screening area; 8, screening unit; 9, elastic sheet; 10, first screening unit; 11, second screening unit; 12, third screening unit; 13, drive device; 14, fourth screening unit; 15, rotating shaft; 16, drive shaft; 17, bevel gear mechanism; 18, drive blade; 19, drive mechanism; 20, first gear; 21, second gear; 22, toothed ring; 23, engagement ring; 24, first airbag; 25, separation cylinder; 26, push plate; 27, second airbag; 28, mounting bracket; 29, abutting rod; 30, wedge surface structure. Detailed implementation manners

[0032] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] As Figures 1 to 8 shown, on the basis of a conventional grading vibrating screen, the present disclosure proposes a grading vibrating screen for phosphate ore processing, which generally also includes a frame 1 and a vibration source provided on the frame 1. At the same time, a sieve plate 2 with a top surface formed as a screening surface 3 is also provided inside the frame 1. Under the oscillation of the vibration source, such as a vibration motor, the sieve plate 2 vibrates, so that the material input into the sieve plate 2 from the feeding end gradually discharges to the discharging end side. During this period, materials of different particle sizes complete screening at different regions along the material flow direction on the screening surface 3.

[0035] Differently from the prior art, the sieve plate 2 in the present disclosure specifically includes a plate body 4, and a plurality of connection ports 5 are opened on the plate body 4 along the material flow direction. The sieve plate 2 further includes a screening member 6 rotatably provided below the plate body 4, and in particular, a plurality of the screening members 6 are provided corresponding to each connection port 5.

[0036] Generally speaking, the outer peripheral surface of the screening member 6 constitutes a screening area 7, and the screening area 7 can be further subdivided and defined as being formed by arranging a plurality of screening units 8 in a circumferential direction. It can be imagined that as the screening member 6 rotates, different screening units 8 will be spliced at the connection port 5. Refer to Figure 1 , in a possible situation, the aperture of the sieve holes of each screening unit 8 is adapted to be the same. Therefore, it is particularly suitable for controlling the rotation of the screening member 6 when the screening unit 8 used for screening is blocked, so as to replace different screening units 8 to continue the screening use situation.

[0037] Refer to Figure 2, in another possible scenario, the aperture diameters of the sieve holes of each screening unit 8 are adapted to be different. For example, the aperture diameters of several screening units 8 along the circumferential direction can increase sequentially. This scenario is particularly applicable when the batch of materials to be screened is adjusted. For example, it is possible to control the rotation of each screening member 6, so as to change the screening range of the sieve plate 2 as a whole to suit the screening requirements of different materials.

[0038] In order to keep the screening surface 3 relatively flat, it is preferable to adapt the cross-section of the screening member 6 to be a regular polygon. In addition, an elastic sheet 9 can be arranged at the opening of the connection port 5. The lap joint between the elastic sheet 9 and the screening unit 8 makes it difficult for gaps through which materials can leak to appear between the connection port 5 and the screening member 6 during and after the rotation of the screening member 6.

[0039] During the actual screening operation, the inventor found that there is a failure scenario that is easily confused with sieve mesh blockage, that is, the case where the proportion of critical particles in the material is too large. In this case, the sieve mesh is not actually blocked, but the critical particles are prone to not passing through the previous screening member 6 correctly and instead passing through the next screening member 6 wrongly, which will cause a reduction in the screening quality of the material.

[0040] In view of the above technical problems, the present disclosure proposes a new applicable form of the screening member 6. See Figure 3 、 Figure 5 , in this case, several screening units 8 of the same screening member 6 are adapted to sequentially include a first screening unit 10, a second screening unit 11, and a third screening unit 12 along the circumferential direction. Among them, the aperture diameter of the sieve holes of the second screening unit 11 is the expected initial size, the first screening unit 10 has the same aperture diameter as the second screening unit 11, and the aperture diameter of the sieve holes of the third screening unit 12 is larger than that of the second screening unit 11.

[0041] For example, the aperture diameter size of the third screening unit 12 can be preferably adapted to be 1.2 - 1.5 times the aperture diameter size of the second screening unit 11. At this time, if it is found during the screening process of the material that critical particles are wrongly mixed into the material screened out by a certain screening member 6, then it is possible to control the rotation of the previous screening member 6 corresponding to this screening member 6, especially to control the previous screening member 6 to rotate until its third screening unit 12 is spliced with the connection port 5, so that the critical particles can be discharged from the expected screening member 6 and it is not easy to block the normal screening passage of materials in other particle size ranges.

[0042] In a more preferred embodiment, a fourth screening unit 14 may be provided circumferentially behind the third screening unit 12, and the aperture of the screen holes of the fourth screening unit 14 may be adapted to be the same as that of the third screening unit 12. For example, if a batch of material is adjusted to be screened through the third screening unit 12 and becomes clogged, the screening element 6 may be controlled to rotate until the fourth screening unit 14 faces the connection port 5, thereby enabling online replacement of the clogged screening unit 8.

[0043] In some embodiments, a driving device 13 for driving the screening element 6 to rotate may be provided on the frame 1. For example, the driving device 13 may include a motor (not shown) connected to each screening element 6, thereby driving the screening element 6 to rotate as expected through the rotation of the motor.

[0044] See also Figures 4 to 8 As another solution, the drive device 13 may include a rotating shaft 15 rotatably disposed beside the sieve plate 2, and a drive shaft 16 is also rotatably disposed at the discharge end of the sieve plate 2. A bevel gear mechanism 17 is connected between the drive shaft 16 and the rotating shaft 15. Drive blades 18 are specifically disposed on the sidewalls of the drive shaft 16. As the material is screened, the falling material impacts the drive blades 18. Under the action of this impact force, the drive blades 18 drive the drive shaft 16 and the rotating shaft 15 to rotate.

[0045] More specifically, see Figure 7 A driving mechanism 19 is provided on the rotating shaft 15 corresponding to each screening element 6, and the driving mechanism 19 may include a first gear 20 and a second gear 21 sleeved on the rotating shaft 15, and a gear ring 22 is provided at the end of the screening element 6, and the first gear 20 and the second gear 21 are both engaged with the gear ring 22.

[0046] Furthermore, the drive mechanism 19 includes an engaging ring 23, which is spline-connected to the rotating shaft 15 and positioned between the first gear 20 and the second gear 21. The first gear 20, the second gear 21, the gear ring 22, and the engaging ring 23 effectively constitute a bevel gear reversing mechanism similar to that of conventional art. Of course, the first gear 20, the second gear 21, and the gear ring 22 are not limited to bevel gears, as long as they can achieve the transmission action described below. The engaging ring 23 can be coupled to the first gear 20, the second gear 21, to transmit power, either through engaging teeth or friction surfaces, without limitation.

[0047] In short, in the present disclosure, the rotating shaft 15 is always rotating. In the initial state, the two engaging rings 23 are both in the disengaged position, so that the first gear 20 and the second gear 21 do not receive rotational power and are kept relatively still on their respective brackets.

[0048] Specifically, two engagement rings 23 are provided opposite to each other, and a first airbag 24 is further provided on the frame 1 between the two engagement rings 23.

[0049] Next, the more special part at the screening member 6 will be described. Refer to Figure 5 , Figure 6 , a separation cylinder 25 is further provided below several screening units 8 of each screening member 6. The material passing through the screening member 6 will fall on the separation cylinder 25. The top surface of the separation cylinder 25 is adapted to form a separation screen, and the aperture of the sieve holes of the separation screen is the same as the aperture of the sieve holes of the second screening unit 11 of the previous screening member 6. In a preferred example, the outer top surface of the separation cylinder 25 is also adapted to be inclined, so that the material falling on the separation cylinder 25 and unable to pass through the separation screen can be guided to be discharged along the first direction.

[0050] For the convenience of description, in Figure 7 , it is defined that the aperture of the second screening unit 11 on the screening member 6 on the left side is 1 mm, and the aperture of the second screening unit 11 on the screening member 6 on the right side is 2 mm. The aperture of the separation screen of the separation cylinder 25 corresponding to the screening member 6 on the right side is correspondingly 1 mm.

[0051] In an ideal situation, the material with a particle size between 0 and 1 mm will be discharged from the screening member 6 on the left side, and the material with a particle size between 1 and 2 mm will be discharged from the screening member 6 on the right side. However, when the proportion of critical particles in the material relative to the screening member 6 on the left side is too large, it is easy to occur, for example, that the material with a particle size of 0.9 mm is discharged from the screening member 6 on the right side. At this time, the material with a particle size of 0.9 mm will fall downward into the separation cylinder 25 after falling on the separation cylinder 25 on the right side.

[0052] The inner bottom surface of the separation cylinder 25 is adapted to be inclined, and thus guides the material falling into the separation cylinder 25 to be discharged in a second direction opposite to the first direction. A push plate 26 is elastically provided at the end of the separation cylinder 25 in the second direction. Under the elastic stop of the elastic member connected to the push plate 26, the material in the separation cylinder 25 that does not exceed the threshold will be kept in the separation cylinder 25. At this time, it can be judged, for example, that the proportion of critical particles in the material does not exceed the threshold. Of course, a certain gap (not shown in the figure) can also be adapted between the push plate 26 and the separation cylinder 25 to allow the material in the separation cylinder 25 to be slowly discharged; when the material in the separation cylinder 25 rises rapidly and the push plate is pushed to expand the above gap, it can be judged, for example, that the proportion of critical particles in the material exceeds the threshold.

[0053] Returning to the drive unit 13 section, a second airbag 27 is also provided beside the push plate 26 on the frame 1, and the second airbag 27 is connected to the first airbag 24 corresponding to the previous screening member 6 through a pipeline. In addition, a mounting bracket 28 is provided beside the first airbag 24 on the frame 1, and two abutting rods 29 are elastically arranged on the mounting bracket 28. And looking from the axial direction of the rotating shaft 15, the two engaging rings 23 are also located between the two abutting rods 29. The top surface of the separation cylinder 25 is also adapted to be elastically movable along the material receiving direction, and a wedge surface structure 30 is adapted to be formed between the end of the top surface of the separation cylinder 25 in the second direction and the two abutting rods 29 (see Figure 8 ).

[0054] Among them, the specific setting of the wedge surface structure 30 is something that those skilled in the art should know, that is, the force transmission direction of two components is changed by the abutment of two inclined surfaces. In this disclosure, with the elastic movement of the separation cylinder 25, under the action of the wedge surface structure 30, one of the two abutting rods 29 will be pushed out towards the engaging ring 23, and the other will retract away from the engaging ring 23.

[0055] Continuing with Figure 7 as an example, when the quantity of materials with a size of 0.9 mm in the right separation cylinder 25 exceeds the threshold value, the push plate 26 is pushed out and squeezes the second airbag 27. At this time, the fluid in the second airbag 27 will be pressed into the first airbag 24 corresponding to the previous screening member 6, and the first airbag 24 will expand and have a tendency to push the two engaging rings 23 to move towards the first gear 20 and the second gear 21 respectively. The following specifically elaborates on the more special points in this step:

[0056] At this time, according to the elastic movement state of the top surface of the separation cylinder 25 corresponding to the previous screening member 6, there are two transmission situations:

[0057] 1. The top surface of the left separation cylinder 25 is in a downward pressure state. At this time, it means that the materials in the other expected particle size ranges of the left screening member 6 except for the critical particles are being screened normally, that is, the left screening unit two 11 is not blocked. At the same time, the downward pressure top surface of the left separation cylinder 25 will push the corresponding abutting rod 29 (for the convenience of understanding, it is defined as abutting rod one) out through the wedge surface structure 30. Under the abutment of the abutting rod one, the expanded first airbag 24 cannot push the corresponding engaging ring 23 (for the convenience of understanding, it is defined as engaging ring one) to engage with the first gear 20. On the contrary, the expanded first airbag 24 will push the engaging ring two to engage with the second gear 21. Subsequently, driven by the toothed ring 22, the left screening member 6 rotates in reverse, so that the left screening unit three 12 is spliced with the connection port 5.

[0058] 2. The top surface of the separation cylinder 25 on the left is in the rising state. At this time, it can be similarly judged that the screening unit 8 on the left enters the blocked state. Meanwhile, the top surface of the rising separation cylinder 25 on the left will push out the second abutting rod through the inclined plane structure, and the first abutting rod will automatically retract under the action of elastic force. Under the abutment of the second abutting rod, the inflated first airbag 24 will push the first engagement ring to engage with the first gear 20. At this time, the screening member 6 on the left will rotate forward, so that the first screening unit 10 on the left is spliced with the connection port 5.

[0059] In this embodiment, through the ingenious cooperation of the separation cylinder 25, the push plate 26, the first airbag 24, the second airbag 27 and the abutting rod 29, the screening situation of the material can be automatically identified, and different screening units 8 can be automatically switched to be spliced with the connection port 5, so as to improve the screening quality of the material.

[0060] Embodiment 2:

[0061] A grading vibration screening method for phosphate ore processing, including the grading vibration screen for phosphate ore processing in Embodiment 1, and further including the following steps:

[0062] S1. Feed the material from the feeding end of the sieve plate 2;

[0063] S2. Control the rotation of the screening member 6 according to the screening situation, so as to drive different screening units 8 to be spliced with the connection port 5.

[0064] The above is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the techniques or knowledge in related fields. And the changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A grading vibrating screen for phosphate ore processing, comprising a frame (1), a vibration source is provided on the frame (1), and a sieve plate (2) is further provided on the frame (1), a screening surface (3) is defined and formed on the sieve plate (2), and the characteristics are as follows: The sieve plate (2) includes a plate body (4), and a plurality of connecting ports (5) are provided on the plate body (4) along the flow direction of the material. The sieve plate (2) also includes a screening element (6) rotatably arranged below the plate body (4). The screening element (6) is provided with a plurality of screening elements (6), and the plurality of screening elements (6) are opposite to the plurality of connecting ports (5) one by one. The outer peripheral surface of the screening element (6) is formed into a screening area (7), and the screening area (7) is formed by a plurality of screening units (8) arranged along the circumferential direction. As the screening element (6) rotates, one of the screening units (8) is spliced at the connecting port (5); The plurality of screening units (8) of the same screening element (6) include screening unit one (10), screening unit two (11) and screening unit three (12) in sequence along the circumferential direction, wherein the sieve holes of the screening unit one (10) and the screening unit two (11) have the same aperture, and the sieve hole of the screening unit three (12) has a larger aperture than the sieve hole of the screening unit two (11); The frame (1) is provided with a driving device (13) for driving the screening element (6) to rotate; The aperture size of the sieve hole of the screening unit three (12) is 1.2-1.5 times the aperture size of the sieve hole of the screening unit two (11).

2. The grading vibrating screen for phosphate ore processing according to claim 1, characterized in that: The cross section of the screening element (6) is a regular polygon.

3. The classification vibrating screen for phosphate rock processing according to claim 1, characterized in that: The sieve holes in each screening area (7) have the same aperture.

4. The grading vibrating screen for phosphate ore processing according to claim 1, characterized in that: The sieve holes of the plurality of sieve units (8) on the same sieve element (6) have different apertures.

5. The classification vibrating screen for phosphate rock processing according to any one of claims 1-4, characterized in that: An elastic sheet (9) is provided at the opening of the connection port (5), and the elastic sheet (9) is overlapped with the screening unit (8).

6. The grading vibrating screen for phosphate rock processing according to claim 1, characterized in that: The plurality of screening units (8) of the same screening element (6) further include a screening unit four (14) circumferentially connected to the rear side of the screening unit three (12), and the apertures of the screening holes of the screening unit three (12) and the screening unit four (14) are the same.

7. The grading vibrating screen for phosphate rock processing according to claim 1, characterized in that: The driving device (13) includes a rotating shaft (15) rotatably arranged beside the sieve plate (2), a driving shaft (16) is rotatably arranged at the discharge end of the sieve plate (2), a bevel gear mechanism (17) is connected between the driving shaft (16) and the rotating shaft (15), and a driving blade (18) is provided on the side wall of the driving shaft (16), and the driving blade (18) is adapted to drive the driving shaft (16) and the rotating shaft (15) to rotate under the push of the material; A driving mechanism (19) is provided on the rotating shaft (15) corresponding to each of the screening elements (6), and the driving mechanism (19) includes a first gear (20) and a second gear (21) sleeved on the rotating shaft (15); a gear ring (22) is provided at the end of the screening element (6), and the first gear (20) and the second gear (21) are both engaged with the gear ring (22); The driving mechanism (19) further includes an engaging ring (23) connected to the rotating shaft (15) via a spline and located between the first gear (20) and the second gear (21), wherein two engaging rings (23) are opposed to each other, and a first air bag (24) is provided between the two engaging rings (23); A separation cylinder (25) is provided below the plurality of screening units (8) of each screening element (6), the outer top surface of the separation cylinder (25) being adapted to form a separation screen, the aperture of the screen holes of the separation screen being the same as the aperture of the screen holes of the second screening unit (11) of the previous screening element (6), and the outer top surface of the separation cylinder (25) being inclined to guide the corresponding material to be discharged from the first direction; The inner bottom surface of the separation cylinder (25) is tilted to guide the corresponding material to be discharged from the second direction. The end of the separation cylinder (25) is elastically connected to a push plate (26). A second air bag (27) is provided on the frame (1) beside the push plate (26). The second air bag (27) is connected to the first air bag (24) corresponding to the previous screening element (6) through a pipeline. A mounting frame (28) is provided on the frame (1) beside the first airbag (24), and two abutting rods (29) are elastically provided on the mounting frame (28). When viewed from the axial direction of the rotating shaft (15), the two coupling rings (23) are located between the two abutting rods (29). The top surface of the separation cylinder (25) can be elastically provided along the material receiving direction, and a wedge surface structure (30) is adapted between the end of the top surface of the separation cylinder (25) and the two abutting rods (29). As the separation cylinder (25) is elastically provided, one of the two abutting rods (29) extends toward one side of the coupling ring (23), and the other of the two abutting rods (29) is retracted away from one side of the coupling ring (23). When the material in the separation cylinder (25) exceeds a threshold value, the push plate (26) is pushed out and squeezes the second air bag (27), and then the first air bag (24) expands and pushes the engagement ring (23) into an engagement position.

8. A classification vibration screening method for phosphate ore processing, characterized in that: The method comprises the grading vibrating screen for phosphate rock processing according to any one of claims 1 to 7, further comprising the following steps: S1, feeding the material from the feeding end of the sieve plate (2); S2. Control the rotation of the screening element (6) according to the screening situation to drive the different screening units (8) to be spliced to the connection port (5).

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