CN117046721A - Superfine grading equipment for dry materials - Google Patents

Abstract

The invention discloses superfine dry material classifying equipment, which relates to the technical field of dispersion and classification of dry materials and comprises a coarse separating device and a fine classifying device, wherein the coarse separating device can discharge coarse particle materials with oversized sizes, so that the coarse particle materials do not participate in fine classification, and the ineffective classifying load of the fine classifying device is greatly reduced. The sieve holes of the classifying screen plate in the fine classifying device can generate elastic deformation, so that the sieve holes are dynamically changed all the time when the fine classifying device works, and the sieve holes are not easy to be blocked; the material that is less than the sieve mesh size can see through the sieve mesh fast, and the material that blocks in the sieve mesh then can be extruded or pop out the sieve mesh in the dynamic change of sieve mesh, effectively improves the screening efficiency to fine material. The dry material hyperfine classification equipment provided by the invention can be suitable for materials after roller grinding of a roller press or a high-pressure roller mill, can be used for scattering, dispersing and finely classifying the material cake materials containing a large amount of fine powder particles after roller grinding, and can ensure the accurate and efficient classification of hyperfine materials with the particle size less than or equal to 0.5mm.

Description

Superfine grading equipment for dry materials

Technical Field

The invention relates to the technical field of dispersion and classification of dry materials, in particular to superfine classification equipment for dry materials.

Background

Dry classification of ultra-fine materials has been a difficult problem for the mining and building industries. Particularly, a product which is subjected to roller grinding by a roller press or a high-pressure roller mill is used, the content of superfine particle materials which are less than or equal to 0.5mm in the product is large, but the fine particle materials and the coarse particle materials in the product have certain coating and agglomeration phenomena, so that a material cake with a large number of microcracks and internal stress in the product is formed, and the coated and agglomerated materials can be scattered and dispersed only by knocking to a certain degree. So it is now conventional to configure a dedicated break-up device and separate classification devices to disperse and classify the product.

The current conventional classification method is as follows: firstly classifying the materials with the grain size less than or equal to 3mm by a set of preliminary classifying equipment, carrying out roller grinding again in the return process of the materials with the grain size more than 3mm, and carrying out further fine classification on the materials with the grain size less than or equal to 0.5mm by a fine classifying equipment. The industrialized dry classification of the material with the grain size less than or equal to 1mm under the current condition cannot be completed by screening equipment, and can only be realized by adopting air classification equipment. Because all materials need to be driven by high-pressure air to carry out classified movement in a wind field and the materials carried by the wind power of unit volume are limited, a large amount of high-pressure air is needed for carrying out classified treatment on the materials, and a special high-pressure air system and a high-power high-pressure air blower are needed to be configured in the system. The existing wind power grading equipment has the problems of large occupied area and space, high equipment abrasion rate in a wind field, high energy consumption required by unit grading products, complex process system, high wind speed of partial flow fields caused by probabilistic grading and easy coarse running.

At present, when the conventional dry screening equipment is used for treating products, fine particle materials and coarse particle materials have certain coating and agglomeration phenomena, because the coarse and fine particle materials are not completely dispersed, the coarse particle materials and the coarse and fine particle-level coated materials influence the effective screening working area in the screening process, so that the effective treatment capacity of the screening surface is reduced, and the grading effect of the equipment is poor. Meanwhile, when fine materials with the size less than or equal to 1mm (even less than or equal to 0.5 mm) are classified by conventional dry screening equipment, the fine powder is accumulated continuously in the sieve holes and cannot be discharged, so that the sieve holes are gradually blocked, and finally the fine materials cannot be classified effectively due to the fact that the adhesion force on the surfaces of the fine powder materials is relatively large and is larger than the inertia force born by the fine powder in the screening process.

Based on the current dry classification difficult problem of the hyperfine materials, the technical personnel think that the invention can adapt to the product after the roller press or the high-pressure roller mill is used for scattering, dispersing and dry classification and ensure the precise and efficient classification equipment of the hyperfine materials less than or equal to 0.5mm.

Disclosure of Invention

The invention aims at: aiming at the problems, the invention provides the dry material hyperfine classification equipment which can be suitable for materials after the roller press or the high-pressure roller mill is used for carrying out scattering dispersion and fine classification on the material cake materials which contain a large amount of fine powder particles after the roller press or the high-pressure roller mill is used for carrying out the precise and efficient classification on hyperfine materials which are less than or equal to 0.5mm.

The technical scheme adopted by the invention is as follows:

a dry material hyperfine classification device comprises a coarse separation device and a fine classification device, wherein the coarse separation device and the fine classification device can vibrate under the action of an excitation device; the device comprises a coarse screening plate, a vibration excitation device, a coarse screening plate, a vibrating device and a coarse screening device, wherein the coarse screening plate is provided with a raw material feeding port, a coarse grade discharging port and a preliminary grading discharging port, a coarse screening plate capable of scattering and screening materials is arranged in the coarse screening plate, one end of the coarse screening plate is a fixed end, the other end of the coarse screening plate is a cantilever end, a plurality of knocking structures protruding outwards from the surface of the coarse screening plate are arranged on the upper surface of the coarse screening plate, when the coarse screening plate is driven to vibrate by the vibration excitation device, the cantilever end of the coarse screening plate can generate inertia force, and the knocking structures can act on a screened object and scatter the screened object under the driving of the inertia force; the fine classification device is provided with a classification feed port, a medium-grain grade discharge port and a fine-grain grade discharge port, and the preliminary classification discharge port of the coarse separation device is communicated with the classification feed port of the fine classification device; a classifying screen plate is arranged in the fine classifying device, and the screen holes of the classifying screen plate can generate elastic deformation under the action of objects to be screened and vibration; raw materials pass through coarse screening board screening, and coarse particle material discharges from coarse fraction discharge gate, and remaining material is as separating coarse material from preliminary classifying discharge gate entering fine classification device, separates coarse material and sieves through classifying screen board, and well granule material discharges from well granule level discharge gate, and fine particle material discharges from fine fraction discharge gate.

Further, the raw materials pan feeding mouth and coarse fraction discharge gate are located respectively and are separated coarse fraction device length direction's both ends, separate coarse fraction device to coarse fraction discharge gate slope arrangement, a plurality of coarse separation sieve boards are arranged along separating coarse fraction device length direction, form multistage structure of beating, separate coarse separation sieve board below and be equipped with the collecting tank, the bottom of collecting tank is located to preliminary hierarchical discharge gate.

Further, the classifying feed inlet and the middle-grain-level discharge outlet are respectively arranged at two ends of the length direction of the fine classifying device, the fine classifying device is obliquely arranged towards the middle-grain-level discharge outlet, the classifying screen plate is arranged along the length direction of the fine classifying device, and the fine-grain-level discharge outlet is arranged below the classifying screen plate.

Further, the coarse separator is arranged above the fine classifier, and the inclination direction of the coarse separator is opposite to that of the fine classifier.

Further, the excitation device comprises N vibration exciters and N driving motors, N is an integer greater than or equal to one, the driving motors are in one-to-one correspondence with the vibration exciters, the driving motors are provided with encoder devices, the encoder devices are connected with a control device through signals, and the driving motors are connected with and controlled by the control device through signals.

Further, when the N driving motors drive the vibration exciters to rotate in the same direction, the N vibration exciters are mutually matched to form an elliptical vibration track; when N driving motors drive two adjacent vibration exciters to reversely rotate, the N vibration exciters are mutually matched to form a linear vibration track.

Further, the classifying screen plate comprises a screen plate frame, a plurality of elastic screen wires capable of generating elastic deformation under the action of the vibration excitation device are arranged in the screen plate frame, screen holes with required sizes are formed between adjacent elastic screen wires, and the elastic screen wires are mutually matched to form an elastic screen surface.

Further, the elastic screen surface below is provided with braced frame, braced frame connects in the sieve frame, be equipped with elastic support on the braced frame, elastic screen wire passes elastic support, elastic support provides holding power for elastic screen wire, just for the flexible contact that can produce secondary vibration between elastic support and the elastic screen wire.

Further, the fine classification device is provided with a plurality of screening layers along the height direction, and the mesh size of the classification screen plate in the upper screening layer is larger than or equal to the mesh size of the classification screen plate in the lower screening layer.

Further, the cantilever ends are a plurality of screen bars arranged side by side, one end of each screen bar is connected to the fixed section, the other end of each screen bar is suspended, a gap between two adjacent screen bars is a screening area, and the knocking structure is arranged in the non-screening area; the coarse screen plate is obliquely arranged towards the cantilever end.

In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:

1. the coarse-grain separating device can discharge coarse-grain materials with oversized sizes, so that the coarse-grain materials do not participate in fine classification, and the ineffective classification load of the fine classification device is greatly reduced.

2. The coarse screen plate has certain flexibility, so that the screen bars can drive the knocking structure to perform high-frequency vibration to a large extent, and impact scattering and dispersing are performed on the material cake-shaped or agglomerate-shaped materials.

3. The sieve holes of the classifying screen plate can generate elastic deformation, so that the sieve holes are dynamically changed all the time when in work, the self-cleaning effect of the sieve holes can be achieved, the adaptability to the moisture of materials is strong, and the sieve holes are not easy to block.

4. In the operation process of the classifying screen plate, materials smaller than the size of the screen holes can quickly penetrate the screen holes, and the materials clamped in the screen holes can be extruded or ejected out of the screen holes in the dynamic change of the screen holes, so that the screening efficiency is high when the screening operation of fine materials is finished.

5. The sieve holes of the classifying screen plate are formed by surrounding the elastic screen wires, and the classifying screen plate has the advantages of high aperture ratio, large effective screening area and high effective treatment capacity per unit area.

6. The elastic support provided by the invention can support the elastic screen wires, simultaneously, the elastic screen wires can generate secondary vibration in the vibration process, and the inertia force of the materials in the screening process is increased, so that the fine powder materials are difficult to accumulate in the screen holes to cause blockage, and the screen holes can keep a good working state for a long time.

7. The vibration exciter can be independently controlled, and the rotating speed and the rotating phase of each driving motor can be conveniently adjusted according to the screening requirements and the screening conditions of materials, so that the coarse separation device and the fine separation device can work along different vibration tracks, and the coarse separation device and the fine separation device are ensured to obtain the optimal vibration state and exciting force.

8. The invention realizes the feedback adjustment of each driving motor through the encoder device so as to ensure the synchronous control among a plurality of driving motors.

9. The invention makes the dry grading industrial application of superfine materials of products less than or equal to 0.5mm possible. The complex winnowing system is not required to be configured, the complexity of a process system is greatly reduced, and the construction cost, the occupied area and the operation cost of a large number of equipment and a high-power winnowing system are reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of the dry material ultra-fine classification apparatus of the present invention;

FIG. 2 is a schematic structural view of the excitation device according to the present invention;

FIG. 3 is a schematic view of the structure of the coarse screen plate of the present invention;

FIG. 4 is a schematic view of a striking structure of the present invention in the form of a rod;

FIG. 5 is a schematic view of a hammer-like striking structure according to the present invention;

FIG. 6 is a schematic view of a cone-shaped knocking structure according to the present invention;

fig. 7 is a top view of a sizing screen deck of the present invention;

fig. 8 is a side view of a sizing screen deck of the present invention;

FIG. 9 is a schematic view of the configuration of the elastic screen wires of the present invention mated with an elastic support;

FIG. 10 is a schematic view of the trajectory of counter-rotation of adjacent exciters of the present invention;

FIG. 11 is a schematic diagram of the locus of the same direction rotation of the exciter of the present invention.

The marks in the figure: 1-coarse screen plate, 101-fixed end, 102-cantilever end, 103-screening area, 2-knocking structure, 3-classifying screen plate, 4-elastic screen wire, 5-elastic support, 6-fine classifying device, 601-classifying feed inlet, 602-medium-grain grade discharge outlet, 603-fine-grain grade discharge outlet, 7-vibration exciter, 8-driving motor, 9-sensing component, 10-encoder device, 11-flexible coupling, 12-coarse separating device, 1201-raw material feed inlet, 1202-coarse-grain grade discharge outlet, 1203-preliminary classifying discharge outlet and 13-vibration exciting device.

Detailed Description

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

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1

The dry material ultra-fine classification equipment comprises a coarse separation device 12 and a fine classification device 6, wherein the coarse separation device 12 and the fine classification device 6 can vibrate under the action of an excitation device 13; the coarse screening device 12 is provided with a raw material inlet 1201, a coarse fraction discharge hole 1202 and a preliminary grading discharge hole 1203, the coarse screening device 12 is internally provided with a coarse screening plate 1 capable of scattering and screening materials, one end of the coarse screening plate 1 is a fixed end 101, the other end of the coarse screening plate is a cantilever end 102, the upper surface of the coarse screening plate 1 is provided with a plurality of knocking structures 2 protruding outwards from the surface of the coarse screening plate 1, when the coarse screening device 12 is driven to vibrate by the exciting device 13, the cantilever end 102 of the coarse screening plate 1 can generate inertia force, and the knocking structures 2 can act on objects to be screened under the drive of the inertia force and scatter the objects to be screened; the fine classification device 6 is provided with a classification feed port 601, a medium-grain grade discharge port 602 and a fine-grain grade discharge port 603, and the preliminary classification discharge port 1203 of the coarse separation device 12 is communicated with the classification feed port 601 of the fine classification device 6; a classifying screen plate 3 is arranged in the fine classifying device 6, and the screen holes of the classifying screen plate 3 can generate elastic deformation under the action of objects to be screened and vibration; raw materials pass through coarse screening plate 1 screening, wherein coarse grain material is discharged from coarse grain grade discharge port 1202, and remaining material enters fine classification device 6 from preliminary classification discharge port 1203 as coarse screening material, coarse screening material passes through classification screening plate 3 screening, medium grain material is discharged from medium grain grade discharge port 602, and fine grain material is discharged from fine grain grade discharge port 603.

The raw material feeding port 1201 and the coarse fraction discharge port 1202 are respectively arranged at two ends of the length direction of the coarse fraction device 12, the coarse fraction device 12 is obliquely arranged towards the coarse fraction discharge port 1202, a plurality of coarse fraction screening plates 1 are arranged along the length direction of the coarse fraction device 12 and are equal in interval, a multi-stage knocking structure 2 is formed, a material collecting groove is arranged below the coarse fraction screening plates 1, and the preliminary classification discharge port 1203 is arranged at the bottom end of the material collecting groove.

The classifying feed inlet 601 and the middle-grain-level discharge outlet 602 are respectively arranged at two ends of the length direction of the fine classifying device 6, the fine classifying device 6 is obliquely arranged towards the middle-grain-level discharge outlet 602, the classifying screen plate 3 is arranged along the length direction of the fine classifying device 6, and the fine-grain-level discharge outlet 603 is arranged below the classifying screen plate 3.

The coarse separator 12 is disposed above the fine classifier 6, and the inclination of the coarse separator 12 is opposite to the inclination of the fine classifier 6. The whole structure is compact, and the occupied area is small.

The vibration excitation device 13 comprises N vibration exciters 7 and N driving motors 8, N is an integer greater than or equal to one, the driving motors 8 are in one-to-one correspondence with the vibration exciters 7, the driving motors 8 are provided with encoder devices 10, the encoder devices 10 are in signal connection with a control device, and the driving motors 8 are in signal connection and controlled by the control device. When N is one, the rotating speed of the driving motor 8 is regulated by the control device to change the exciting force of the exciter 7 and the vibration frequency of the dry material hyperfine grading equipment so as to adapt to the grading requirements of different materials; when N is greater than one, a plurality of driving motors 8 are adopted to mutually cooperate to drive the dry material hyperfine grading equipment to vibrate, the rotating speed and the rotating direction of the driving motors 8 can be adjusted through the control device to control and adjust the rotating speed and the phase of the vibration exciter 7 in real time, and the vibration exciting device 13 can achieve the required vibration exciting force and the vibration exciting force direction of the dry material hyperfine grading equipment through the adjustment of the control device. Other structures and parts such as synchronous belts and the like are not needed. Has the advantages of simple structure, convenient and quick adjustment means.

The coarse isolation device 12 and the fine classification device 6 can use the same set of vibration excitation device 13, or the coarse isolation device 12 and the fine classification device 6 can use different vibration excitation devices 13 to drive respectively, in this embodiment, a set of vibration excitation device 13 is preferably arranged on the fine classification device 6 to drive the dry material ultra-fine classification device to vibrate, and preferably, N is four. Two excitation parts of the single vibration exciter 7 are assembled at two ends of the fine classification device 6 in the width direction, and the two excitation parts of the single vibration exciter 7 are connected through a connecting shaft which is rotatably connected with the fine classification device 6 through a bearing.

The assembly position of the vibration exciter 7 and the fine grading device 6 is provided with a sensing component 9, and the sensing component 9 is in signal connection with the control device.

One side of the connecting shaft is connected with the corresponding driving motor 8 through a flexible coupling 11 to form a driving side, the other side is a non-driving side, and the sensing assembly 9 comprises a driving side sensor group arranged on the driving side of the connecting shaft and a non-driving side sensor group arranged on the non-driving side of the connecting shaft.

The driving side sensor group comprises a driving side temperature sensor, a driving side amplitude sensor and a driving side vibration acceleration sensor.

The non-driving side sensor group comprises a non-driving side temperature sensor, a non-driving side amplitude sensor and a non-driving side vibration acceleration sensor.

Preferably, the sensing assembly 9 is assembled at the bearing, and can monitor whether the running temperature and vibration condition of the bearing are normal in real time, so as to predict the maintenance time of the equipment in advance.

Each driving motor 8 can independently control the steering and rotating speed of the corresponding vibration exciter 7, and the control device can control the four driving motors 8 to rotate in the same phase or different phases.

When the four driving motors 8 drive the vibration exciters 7 to rotate in the same direction, the four vibration exciters 7 are mutually matched to form an elliptical vibration track, and when the classification screen plate 3 is stuck or the processing capacity of equipment is required to be increased when the easily screened material is processed, all the vibration exciters 7 can be adjusted to rotate in the same direction, at the moment, the motion track of the fine classification device 6 is an elliptical track, the processing capacity of the classification screen plate 3 is increased, and meanwhile, the stuck screen holes can obtain a certain self-cleaning effect; when the four driving motors 8 drive the two adjacent vibration exciters 7 to reversely rotate, the four vibration exciters 7 are mutually matched to form a linear vibration track, if the system feedback screening effect is poor, the rotating speed of the vibration exciters 7 can be simultaneously increased on line, the exciting force and the vibration frequency are increased, and the screening effect is improved.

The classifying screen plate 3 comprises a screen plate frame, a plurality of elastic screen wires 4 capable of generating elastic deformation under the action of an excitation device 13 are arranged in the screen plate frame, screen holes with required sizes are formed between adjacent elastic screen wires 4, and the elastic screen wires 4 are mutually matched to form an elastic screen surface.

The supporting framework is arranged below the elastic screen surface and connected to the screen plate frame, an elastic support 5 is arranged on the supporting framework, the elastic screen wires 4 penetrate through the elastic support 5, the elastic support 5 provides supporting force for the elastic screen wires 4, and flexible contact capable of generating secondary vibration is arranged between the elastic support 5 and the elastic screen wires 4.

The fine classifying device 6 is provided with a plurality of classifying layers along the height direction, wherein the sizes of the sieve holes of the classifying screen plates 3 in the plurality of classifying layers are equal, namely, the intervals between the adjacent elastic sieve wires 4 are equal, and the interval selected in the embodiment is 0.5mm. The section of the elastic screen wire 4 is at least one of round, oval, square, rectangular, triangular and trapezoidal. In this embodiment, the preferred cross section is circular.

The elastic vibration sieve plate provided by the embodiment is adopted to dry-grade fine materials with the grain size less than or equal to 0.5mm, the moisture adaptability of the raw materials can reach 5%, and the yield per unit area can reach 10-15 t/square meter h.

The cantilever ends 102 are a plurality of screen bars arranged side by side, one ends of the screen bars are connected to the fixed end 101, the other ends of the screen bars are suspended, gaps between two adjacent screen bars are screening areas 103, and the knocking structure 2 is arranged in the non-screening areas 103; the coarse screen plate 1 is obliquely arranged towards the cantilever end 102. The gravity of the material is utilized to match with the inclined structure so that the material can sequentially move to each coarse screen plate 1, and the gravity is matched with the driving device 13 to drive, so that the scattering effect on the material can be enhanced.

The knocking structure 2 extends along the normal direction of the upper surface of the coarse screen plate 1.

The knocking structure 2 is at least one of a rod shape, a hammer shape and a cone shape. In this embodiment, the taper shape shown in fig. 6 is preferable.

The principles and embodiments of the present invention have been described herein with reference to specific examples, which are intended to be merely illustrative of the methods of the present invention and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Claims (10)

1. The dry material ultra-fine classification equipment is characterized by comprising a coarse separation device and a fine classification device, wherein the coarse separation device and the fine classification device can vibrate under the action of an excitation device; the device comprises a coarse screening plate, a vibration excitation device, a coarse screening plate, a vibrating device and a coarse screening device, wherein the coarse screening plate is provided with a raw material feeding port, a coarse grade discharging port and a preliminary grading discharging port, a coarse screening plate capable of scattering and screening materials is arranged in the coarse screening plate, one end of the coarse screening plate is a fixed end, the other end of the coarse screening plate is a cantilever end, a plurality of knocking structures protruding outwards from the surface of the coarse screening plate are arranged on the upper surface of the coarse screening plate, when the coarse screening plate is driven to vibrate by the vibration excitation device, the cantilever end of the coarse screening plate can generate inertia force, and the knocking structures can act on a screened object and scatter the screened object under the driving of the inertia force; the fine classification device is provided with a classification feed port, a medium-grain grade discharge port and a fine-grain grade discharge port, and the preliminary classification discharge port of the coarse separation device is communicated with the classification feed port of the fine classification device; a classifying screen plate is arranged in the fine classifying device, and the screen holes of the classifying screen plate can generate elastic deformation under the action of objects to be screened and vibration; raw materials pass through coarse screening board screening, and coarse particle material discharges from coarse fraction discharge gate, and remaining material is as separating coarse material from preliminary classifying discharge gate entering fine classification device, separates coarse material and sieves through classifying screen board, and well granule material discharges from well granule level discharge gate, and fine particle material discharges from fine fraction discharge gate.

2. The dry material hyperfine classification apparatus according to claim 1, wherein the raw material inlet and the coarse fraction discharge port are respectively arranged at two ends of the coarse fraction discharge port in the length direction of the coarse fraction device, the coarse fraction device is obliquely arranged towards the coarse fraction discharge port, a plurality of coarse fraction screening plates are arranged along the length direction of the coarse fraction device to form a multi-stage knocking structure, a collecting tank is arranged below the coarse fraction screening plates, and the preliminary classification discharge port is arranged at the bottom end of the collecting tank.

3. The dry material hyperfine classification apparatus according to claim 2, wherein the classification feed port and the middle-sized discharge port are provided at both ends in a length direction of the fine classification device, the fine classification device is arranged obliquely to the middle-sized discharge port, the classification screen plate is arranged in the length direction of the fine classification device, and the fine-sized discharge port is provided below the classification screen plate.

4. A dry material ultra-fine classification apparatus according to claim 3, wherein said coarse separator is disposed above said fine classifier and the inclination of said coarse separator is opposite to the inclination of said fine classifier.

5. The dry material hyperfine classification device according to claim 1, wherein the vibration excitation device comprises N vibration exciters and N driving motors, N is an integer greater than or equal to one, the driving motors are in one-to-one correspondence with the vibration exciters, the driving motors are provided with encoder devices, the encoder devices are in signal connection with the control device, and the driving motors are in signal connection and controlled by the control device.

6. The dry material hyperfine classification apparatus of claim 5, wherein N vibration exciters are mutually matched to form an elliptical vibration track when N driving motors drive the vibration exciters to rotate in the same direction; when N driving motors drive two adjacent vibration exciters to reversely rotate, the N vibration exciters are mutually matched to form a linear vibration track.

7. The dry material hyperfine classifying device as claimed in claim 1, wherein the classifying screen plate comprises a screen plate frame, a plurality of elastic screen wires capable of generating elastic deformation under the action of the excitation device are arranged in the screen plate frame, a screen hole with a required size is formed between the adjacent elastic screen wires, and the plurality of elastic screen wires are mutually matched to form an elastic screen surface.

8. The dry material hyperfine classifying apparatus according to claim 7, wherein a supporting framework is arranged below the elastic screen surface, the supporting framework is connected to the screen plate frame, an elastic support is arranged on the supporting framework, the elastic screen wires pass through the elastic support, the elastic support provides supporting force for the elastic screen wires, and flexible contact capable of generating secondary vibration is arranged between the elastic support and the elastic screen wires.

9. The dry material ultra-fine classification apparatus according to claim 1, wherein the fine classification device is provided with a plurality of classification layers in a height direction, and a mesh size of the classification screen plate in an upper classification layer is equal to or larger than a mesh size of the classification screen plate in a lower classification layer.

10. The dry material hyperfine classification apparatus of claim 1, wherein the cantilever end is a plurality of screen bars arranged side by side, one end of each screen bar is connected to the fixed section, the other end of each screen bar is suspended, a gap between two adjacent screen bars is a screening area, and the knocking structure is arranged in a non-screening area; the coarse screen plate is obliquely arranged towards the cantilever end.