Winnowing machine system

Abstract

The invention discloses a winnowing machine system. A first separation chamber, a second separation chamber and a settling chamber are sequentially arranged in a box body of the winnowing machine system, the first separation chamber, the second separation chamber and the settling chamber are sequentially communicated, and a plurality of air suction boxes communicated with the settling chamber are arranged at the top of the settling chamber; a first rotary drum of the main separation device is rotatably arranged in a first separation chamber, the inlet end of a first air nozzle is connected with the outlet end of a main fan, and the outlet end of the first air nozzle is arranged in the first separation chamber; a second rotary drum of the auxiliary separation device is rotatably arranged in a second separation chamber, the inlet end of a second air nozzle is connected with the outlet end of an auxiliary fan, and the outlet end of the second air nozzle is arranged in the second separation chamber; the air return pipeline is connected with the air suction box and is communicated with the settling chamber, so that the settling chamber is kept in a negative pressure state. According to the winnowing machine system, materials are sorted for three times, the sedimentation effect of the materials in the sorting process is good, and the sorting precision of the materials is improved.

Description

Technical Field

[0001] The present invention relates to a material sorting device, and particularly to a pneumatic separator system. Background Art

[0002] Pneumatic separators separate materials of different densities or particle sizes through air flow and are widely used in various industries. Most of the pneumatic separators in related technologies adopt a single rotating drum or single-channel air flow design, and the materials are sorted under the action of a single air flow. Therefore, the existing pneumatic separation equipment has problems such as insufficient sorting accuracy, poor sedimentation effect, poor air flow stability, and limited adaptability. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a pneumatic separator system with high sorting accuracy and good sedimentation effect.

[0004] The pneumatic separator system according to an embodiment of the present invention includes a box body, a main separation device, a secondary separation device, and a return air duct. A first separation chamber, a second separation chamber, and a sedimentation chamber are sequentially arranged in the box body, and the first separation chamber, the second separation chamber, and the sedimentation chamber are sequentially communicated. A first discharge port is provided at the bottom of the first separation chamber, a second discharge port is provided at the bottom of the second separation chamber, a third discharge port is provided at the bottom of the sedimentation chamber, and a plurality of suction boxes communicating with the sedimentation chamber are provided at the top of the sedimentation chamber. The plurality of suction boxes are arranged at intervals along the length direction of the sedimentation chamber. The main separation device includes a main fan, a first air nozzle, and a first rotating drum. The first rotating drum is rotatably arranged in the first separation chamber. The inlet end of the first air nozzle is connected to the outlet end of the main fan, and the outlet end of the first air nozzle is arranged in the first separation chamber to blow air into the first separation chamber. The secondary separation device includes a secondary fan, a second air nozzle, and a second rotating drum. The second rotating drum is rotatably arranged in the second separation chamber. The inlet end of the second air nozzle is connected to the outlet end of the secondary fan, and the outlet end of the second air nozzle is arranged in the second separation chamber to blow air into the second separation chamber. The return air duct is connected to the suction box and communicates with the sedimentation chamber to keep the sedimentation chamber in a negative pressure state.

[0005] The air separator system according to the embodiment of the present invention has at least the following beneficial effects: the air separator system of the present invention combines two separation devices, in the first separation chamber, the main separation device separates the material by air separation, and the heavy material in the material falls into the heavy material collection area from the first drop port of the first separation chamber, and the light material and the medium material (relative to the heavy material and the light material, the weight of the medium material is between the heavy material and the light material) enter the second separation chamber with the air flow, and the auxiliary separation device with smaller wind force separates the light material and the medium material by secondary air separation, and the separated medium material falls into the medium material collection area from the second drop port of the second separation chamber, and the remaining light material enters the sedimentation chamber with the air flow, and the light material sinks in the sedimentation chamber and is transported to the outside of the sedimentation chamber through the third drop port of the sedimentation chamber outlet, and the air flow enters the return air duct through the suction box for recovery. Therefore, the air separator system of the present invention sorts the material three times, and the sedimentation effect of the material is good during the sorting process, thereby improving the sorting accuracy of the material.

[0006] According to some embodiments of the present invention, a plurality of spoiler assemblies are disposed on the top wall of the sedimentation chamber, and the plurality of spoiler assemblies are disposed along the length direction of the sedimentation chamber and extend in a direction away from the top wall of the sedimentation chamber.

[0007] According to some embodiments of the present invention, the spoiler assembly includes a first spoiler, a second spoiler, and a third spoiler sequentially arranged along the length direction of the sedimentation chamber, the first spoiler, the second spoiler, and the third spoiler are all laterally arranged in the sedimentation chamber, the distance from the top wall of the sedimentation chamber to the end of the first spoiler away from the top wall of the sedimentation chamber is L1, the distance from the top wall of the sedimentation chamber to the end of the second spoiler away from the top wall of the sedimentation chamber is L2, and the distance from the top wall of the sedimentation chamber to the end of the third spoiler away from the top wall of the sedimentation chamber is L3, wherein L1>L3>L2.

[0008] According to some embodiments of the present invention, the first spoiler and the second spoiler are both arranged obliquely in a direction away from the second separation chamber, and the third spoiler is arranged obliquely in a direction close to the second separation chamber.

[0009] According to some embodiments of the present invention, the first spoiler is provided with a first inclined section and a second inclined section, the first inclined section is close to the top wall of the sedimentation chamber, the second inclined section is located on the side of the first inclined section away from the sedimentation chamber, the angle between the first inclined section and the top wall of the sedimentation chamber is 60°-70°, and the angle between the second inclined section and the top wall of the sedimentation chamber is 70°-80°.

[0010] According to some embodiments of the present invention, the first spoiler and the second spoiler are provided with ventilation holes.

[0011] According to some embodiments of the present invention, the cross-sectional shape of the suction box is trapezoidal. The return air duct includes a main return duct and a secondary return duct connected to the suction box. The main return duct is connected to the air inlet end of the main fan, and the secondary return duct is connected to the air inlet end of the secondary fan.

[0012] According to some embodiments of the present invention, a collector is provided on the duct between the main fan and the first air nozzle to collect the substances entering the duct along the first air nozzle.

[0013] According to some embodiments of the present invention, a dust removal device is further included. A flow dividing valve is provided on the duct between the main fan and the first air nozzle, and the inlet end of the dust removal device is connected to the flow dividing valve.

[0014] According to some embodiments of the present invention, a feeding conveying device and a discharging conveying device are further included. The discharging end of the feeding conveying device is docked with the material inlet end of the first separation chamber. The discharging conveying device is arranged at the bottom of the sedimentation chamber to receive the material coming out from the third discharging port.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the drawings and embodiments, where:

[0017] Figure 1 is a three-dimensional schematic diagram of an air separation machine system according to an embodiment of the present invention;

[0018] Figure 2 is a top view schematic diagram of an air separation machine system according to an embodiment of the present invention;

[0019] Figure 3 is a cross-sectional view schematic diagram of an air separation machine system according to an embodiment of the present invention;

[0020] Figure 4 is Figure 3 a partial enlarged view in

[0021] Figure 5 is a structural schematic diagram of a collector of an air separation machine system according to an embodiment of the present invention.

[0022] Reference Numerals in the Drawings:

[0023] Bracket 100, Feeding Conveying Device 110, Discharging Conveying Device 120;

[0024] Cabinet 200, first separation chamber 210, first blanking port 211, second separation chamber 220, second blanking port 221, sedimentation chamber 230, third blanking port 231, suction box 240;

[0025] Main separation device 300, main fan 310, first air nozzle 320, first rotating drum 330, collector 340, inclined pipe 341, vertical pipe 342, cover 343;

[0026] Auxiliary separation device 400, auxiliary fan 410, second air nozzle 420, second rotating drum 430;

[0027] Return air duct 500, main return duct 510, auxiliary return duct 520;

[0028] Turbulence component 600, first turbulence plate 610, first inclined section 611, second inclined section 612, ventilation hole 613, second turbulence plate 620, third turbulence plate 630, fourth turbulence plate 640;

[0029] Dust removal device 700, flow dividing valve 710. Detailed implementation manners

[0030] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, it should be understood that the orientation descriptions such as left and right indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] In the description of the present invention, if the first and second are described only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0034] Refer to Figure 1 、 Figure 2 、 Figure 3, the air classifier system proposed in the embodiments of the present invention includes a box body 200, a main separation device 300, a secondary separation device 400, and a return air duct 500.

[0035] Specifically, referring to Figure 1 , the air classifier system has a bracket 100, the box body 200 is arranged on the bracket 100, a first separation chamber 210, a second separation chamber 220, and a sedimentation chamber 230 are sequentially arranged in the box body 200. The first separation chamber 210 has a material inlet, and the material to be air classified can be conveyed into the first separation chamber 210 from the material inlet. The first separation chamber 210 is communicated with the second separation chamber, and the second separation chamber 220 is communicated with the sedimentation chamber 230. A first discharge port 211 is provided at the bottom of the first separation chamber 210, a second discharge port 221 is provided at the bottom of the second separation chamber 220, and a third discharge port 231 is provided at the bottom of the sedimentation chamber 230. After the heavy materials, medium materials, and light materials in the material are separated by air classification, they can be conveyed out of the box body 200 through the corresponding first discharge port 211, second discharge port 221, and third discharge port 231. A plurality of suction boxes 240 communicated with the sedimentation chamber 230 are provided at the top of the sedimentation chamber 230. The plurality of suction boxes 240 are arranged at intervals along the length direction of the sedimentation chamber 230. The return air duct 500 is connected to the suction box 240 and communicated with the sedimentation chamber 230. The return air duct 500 is connected to a wind power device. The suction box 240 can form a negative pressure under the action of external wind force, and then make the sedimentation chamber 230 form a negative pressure, so as to discharge the air flow in the sedimentation chamber 230 through the suction box 240.

[0036] Referring to Figure 3 , the main separation device 300 includes a main fan 310, a first air nozzle 320, and a first drum 330. The first drum 330 is rotatably arranged in the first separation chamber 210. The inlet end of the first air nozzle 320 is connected to the outlet end of the main fan 310, and the outlet end of the first air nozzle 320 is arranged in the first separation chamber 210. When the main fan 310 operates, the air flow can blow air into the first separation chamber 210 through the first air nozzle 320.

[0037] The secondary separation device 400 includes a secondary fan 410, a second air nozzle 420, and a second drum 430. The second drum 430 is rotatably arranged in the second separation chamber 220. The inlet end of the second air nozzle 420 is connected to the outlet end of the secondary fan 410, and the outlet end of the second air nozzle 420 is arranged in the second separation chamber 220. When the secondary fan 410 operates, the air flow can blow air into the second separation chamber 220 through the second air nozzle 420.

[0038] The air separator system of the present invention combines two separation devices. When the air separator system is working, the main separation device 300 and the auxiliary separation device 400 are started, and the material to be air-separated is transported to the surface of the first drum 330 through the material inlet of the first separation chamber 210. The first drum 330 rotates so that the heavy material in the material falls from the first drop opening 211, and the medium material and the light material are blown up by the first air nozzle 320, turn over the first drum 330, and enter the second separation chamber 220 driven by the air flow, and fall onto the second drum 430. The surface of the second drum 430 rotates so that the medium material falls from the second drop port 221, the second air nozzle 420 blows up the light material, and it goes into the sedimentation chamber 230 with the air flow, and the light material is separated from the air in the sedimentation chamber 230, and the light material falls from the third drop port 231, and the air flow is discharged from the sedimentation chamber 230 through the suction box 240 and enters the return air duct 500 for recovery. Therefore, the air separator system of the present invention sorts the material three times, and the sedimentation effect of the material is good during the sorting process, which improves the sorting accuracy of the material.

[0039] It should be noted that since the material to be separated in the second separation chamber 220 is medium material, the wind force blown out by the second air nozzle 420 is smaller than the wind force blown out by the first air nozzle 320, and thus the power of the auxiliary fan 410 is smaller than the power of the main fan 310.

[0040] Reference Figure 1 , Figure 3 In this embodiment, the return air duct 500 includes a main return duct 510 and an auxiliary return duct 520 connected to the suction box 240. The main return duct 510 is connected to the air inlet end of the main fan 310, and the auxiliary return duct 520 is connected to the air inlet end of the auxiliary fan 410. The main fan 310 and the auxiliary fan 410 are used to generate negative pressure in the sedimentation chamber 230 to prevent the dust-carrying air flow in the sedimentation chamber 230 from overflowing, so as to keep the environment of the air selection site clean and tidy, and there is no need to add additional wind power equipment, thereby reducing the cost of the air selection machine system.

[0041] It is understandable that, in some embodiments, additional wind power equipment may be connected to the return air duct 500 so that negative pressure is formed in the settling chamber 230, which is not limited here.

[0042] Reference Figure 1 , Figure 2 , Figure 3 The air separator system also includes an inlet conveying device 110 and an outlet conveying device 120. The outlet end of the inlet conveying device 110 is connected to the material inlet end of the first separation chamber 210. The outlet conveying device 120 is arranged at the bottom of the sedimentation chamber 230 to receive the material coming out of the third outlet. The material to be air-separated and the material after air-separation are transported through the inlet conveying device 110 and the outlet conveying device 120, thereby improving the degree of automation of the air separator system.

[0043] It is understandable that the feeding conveying device 110 and the discharging conveying device 120 can adopt belt conveying or other common conveying machines, which are not limited herein.

[0044] Referring to Figure 3 , in some embodiments, a plurality of flow disturbing components 600 are provided on the top wall of the sedimentation chamber 230. The plurality of flow disturbing components 600 are arranged along the length direction of the sedimentation chamber 230 and extend away from the top wall of the sedimentation chamber 230. The flow disturbing components 600 can effectively reduce the air flow velocity entering the sedimentation chamber 230. The smaller the wind force, the worse the ability to entrain materials. After the air flow velocity is reduced, the light materials will fall onto the lower discharging conveying device 120 and be directly discharged outside the sedimentation chamber 230. The light materials in the air flow will settle on the discharging conveying device 120, and no light materials will enter the suction box 240. Therefore, no light materials will enter the return air duct 500, thus avoiding the blockage of the return air duct 500, and further avoiding large fluctuations in the air flow of the main fan 310 and the auxiliary fan 410, thereby improving the sedimentation effect of the air separation system and the separation efficiency.

[0045] Referring to Figure 4 , in some embodiments, the flow disturbing component 600 includes a first flow disturbing plate 610, a second flow disturbing plate 620, and a third flow disturbing plate 630 arranged in sequence along the length direction of the sedimentation chamber 230. In one embodiment, channels for the air flow to enter the suction box 240 are formed between the first flow disturbing plate 610 and the second flow disturbing plate 620, between the second flow disturbing plate 620 and the third flow disturbing plate 630, and between the third flow disturbing plate 630 and the first flow disturbing plate 610 of the adjacent flow disturbing component 600; In some other embodiments, channels for the air flow to enter the suction box 240 are formed between the first flow disturbing plate 610 and the second flow disturbing plate 620, and between the second flow disturbing plate 620 and the third flow disturbing plate 630.

[0046] The first flow disturbing plate 610, the second flow disturbing plate 620, and the third flow disturbing plate 630 are all horizontally arranged in the sedimentation chamber 230. The first flow disturbing plate 610 and the second flow disturbing plate 620 are both inclined in a direction away from the second separation chamber 220, and the third flow disturbing plate 630 is inclined in a direction close to the second separation chamber 220. The distance from the top wall of the sedimentation chamber 230 to the end of the first flow disturbing plate 610 away from the top wall of the sedimentation chamber 230 is L1, the distance from the top wall of the sedimentation chamber 230 to the end of the second flow disturbing plate 620 away from the top wall of the sedimentation chamber 230 is L2, and the distance from the top wall of the sedimentation chamber 230 to the end of the third flow disturbing plate 630 away from the top wall of the sedimentation chamber 230 is L3, where L1 > L3 > L2.

[0047] Since the airflow from the air separator system entering the settling chamber 230 is mixed with dust and light materials, and the wind speed entering the settling chamber 230 from the second separation chamber 220 is relatively fast, the light materials and dust are easily blown directly into the air suction box 240 at the top of the settling chamber 230, affecting the separation effect of the light materials in the settling chamber 230. The airflow is directed to the bottom of the settling chamber 230 through the first spoiler 610, so that the airflow is close to the third drop port 231 to facilitate the settling of light materials. The second spoiler 620 can slow down the airflow before entering the suction box 240. The third spoiler 630 is designed to rotate the airflow pressed down by the first spoiler 610, so that the airflow is reversed and directed to the lower part of the settling chamber 230, so that the airflow in the middle of the settling chamber 230 is slowed down, so that light materials cannot be carried into the suction box 240. Therefore, the airflow entering the suction box 240 only carries air with dust, thereby further improving the sedimentation effect of the air separator system and improving the sorting efficiency.

[0048] Reference Figure 3 In some embodiments, a fourth spoiler 640 is provided on the top of the second separation chamber 220 on one side of the sedimentation chamber 230, and the fourth spoiler 640 extends in the direction close to the material discharge port of the sedimentation chamber 230. The airflow entering the sedimentation chamber 230 from the second separation chamber 220 flows toward the lower part of the sedimentation chamber 230 under the disturbance of the fourth spoiler 640, and then is disturbed by the spoiler assembly 600 provided in the sedimentation chamber 230, which can further enhance the sedimentation effect of light materials in the airflow entering the sedimentation chamber 230 and enhance the sorting efficiency of the air separator system.

[0049] Reference Figure 3 , Figure 4 In some embodiments, the first spoiler 610 and the second spoiler 620 are both arranged obliquely in a direction away from the second separation chamber 220, and the third spoiler 630 is arranged obliquely in a direction close to the second separation chamber 220. The first spoiler 610, the second spoiler 620 and the third spoiler 630 are arranged in this manner, which is conducive to disturbing the airflow, reducing the airflow speed, and facilitating the settling of light materials.

[0050] Reference Figure 4 In some embodiments, the first spoiler 610 is provided with a first inclined section 611 and a second inclined section 612, the first inclined section 611 is close to the top wall of the settling chamber 230, the second inclined section 612 is located on the side of the first inclined section 611 away from the settling chamber 230, the angle between the first inclined section 611 and the top wall of the settling chamber 230 is 60°-70°, and the angle between the second inclined section 612 and the top wall of the settling chamber 230 is 70°-80°. The airflow is guided twice by the first inclined section 611 and the second inclined section 612, and the flow direction is turned twice, which can better disturb the airflow, reduce the airflow velocity, and then reduce the kinetic energy of the airflow, thereby improving the settling effect of light materials.

[0051] In some embodiments, the included angle between the second spoiler 620 and the top wall of the sedimentation chamber 230 is configured to be 60° - 65°, and the included angle between the third spoiler 630 and the top wall of the sedimentation chamber 230 is configured to be 60° - 65°. The second spoiler 620 and the third spoiler 630 with the above structure cooperate with the first spoiler 610, which can effectively reduce the air flow velocity entering the sedimentation chamber, reduce the ability of the wind to entrain materials, and improve the sedimentation efficiency of light materials.

[0052] Refer to Figure 4 , in some embodiments, the first spoiler 610 and the second spoiler 620 are provided with ventilation holes 613. The setting of the ventilation holes 613 can increase the flow area of the sedimentation chamber 230, reduce the air flow resistance, and thus reduce the energy consumption of the main fan 310 and the auxiliary fan 410. The size of the ventilation holes 613 can be set according to the particle size of the materials to prevent the materials from entering the suction box 240 through the ventilation holes 613.

[0053] Refer to Figure 1 , Figure 2 , in some embodiments, the cross-sectional shape of the suction box 240 is trapezoidal, and the main return pipe 510 and the auxiliary return pipe 520 are respectively arranged on the left and right sides of the trapezoidal suction box 240. Therefore, it is convenient to arrange the pipes, and the air flows of different sizes can be effectively separated and enter the main fan 310 and the auxiliary fan 410 with different powers, making the effect better. That is, the air flow rate entering the main fan 310 is more than that entering the auxiliary fan 410. The air flow rates entering the main fan 310 and the auxiliary fan 410 can be adjusted by the pipe diameters of the main return pipe 510 and the auxiliary return pipe 520. A partition can also be arranged inside the suction box 240 to enable the air flow entering the suction box 240 to smoothly enter the two main fans 310 and auxiliary fans 410 with different powers according to the demand.

[0054] Refer to Figure 1 , in some embodiments, a collector 340 is provided on the pipe between the main fan 310 and the first air nozzle 320. The collector 340 is used to collect the objects entering the pipe along the first air nozzle 320, so as to prevent the stones or other sundries entering the pipe from the first air nozzle 320 from entering the inlet of the main fan 310 along the pipe and prevent the damage of the main fan 310.

[0055] Refer to Figure 5 , the collector 340 can adopt the structural form shown in the figure. Such as Figure 5As shown, the collector 340 includes an inclined pipe 341, a vertical pipe 342 and a cover 343. One end of the inclined pipe 341 is connected to the first air nozzle 320, the other end of the inclined pipe 341 is connected to the vertical pipe 342, and the cover 343 is detachably arranged at the end of the vertical pipe 342 away from the inclined pipe 341. The pipe at the outlet end of the main fan 310 is connected to the upper side wall of the inclined pipe 341. Objects such as stones and spherical objects entering from the first air nozzle 320 fall into the vertical pipe 342 along the inclined pipe 341, and will not enter the pipe at the outlet end of the main fan 310, thereby achieving the purpose of preventing damage to the main fan 310. The cover 343 can be opened irregularly to discharge sundries such as stones and spherical objects in the vertical pipe 342.

[0056] Referring to Figure 1 , in some embodiments, the air separation system further includes a dust removal device 700. A flow dividing valve 710 is provided on the pipe between the main fan 310 and the first air nozzle 320. The inlet end of the dust removal device 700 is connected to the flow dividing valve 710. A small part of the dusty air pumped by the main fan 310 enters the dust collector through the flow dividing valve 710, is processed by the dust collector, and then enters the atmosphere or other processes. Most of the air passes through the collector 340 and then enters the first separation chamber 210 through the first blow nozzle for the air separation process.

[0057] The air separation system of the present invention adopts the structure of the above embodiments, which not only solves the problems of insufficient sorting accuracy and poor sedimentation effect of light substances in ordinary single-drum air separators, but also solves the problems of easy feeding blockage, poor air flow stability and poor air flow layout in the air separators in the related art. And the air separation system of the present invention can adapt to larger production capacities and the air separation requirements of different materials, and can be applied to fields such as agriculture (such as grain cleaning), mining (such as ore separation), and waste treatment (such as separation of plastics and metals).

[0058] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0059] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An air separation machine system, characterized in that, include: A box body, wherein a first separation chamber, a second separation chamber and a sedimentation chamber are sequentially arranged in the box body, the first separation chamber, the second separation chamber and the sedimentation chamber are sequentially connected, a first material drop opening is arranged at the bottom of the first separation chamber, a second material drop opening is arranged at the bottom of the second separation chamber, a third material drop opening is arranged at the bottom of the sedimentation chamber, a plurality of suction boxes connected to the sedimentation chamber are arranged at intervals along the length direction of the sedimentation chamber; A main separation device, comprising a main fan, a first air nozzle and a first drum, wherein the first drum is rotatably arranged in the first separation chamber, an inlet end of the first air nozzle is connected to an outlet end of the main fan, and an outlet end of the first air nozzle is arranged in the first separation chamber to blow air into the first separation chamber; A secondary separation device, comprising a secondary fan, a second air nozzle and a second drum, wherein the second drum is rotatably arranged in the second separation chamber, an inlet end of the second air nozzle is connected to an outlet end of the secondary fan, and an outlet end of the second air nozzle is arranged in the second separation chamber to blow air into the second separation chamber; The return air duct is connected to the air suction box and communicated with the settling chamber so as to keep the settling chamber in a negative pressure state.

2. The air classifier system according to claim 1, wherein The top wall of the sedimentation chamber is provided with a plurality of spoiler components, and the plurality of spoiler components are arranged along the length direction of the sedimentation chamber and extend in a direction away from the top wall of the sedimentation chamber.

3. The air separation machine system according to claim 2, wherein The spoiler assembly includes a first spoiler, a second spoiler and a third spoiler which are arranged in sequence along the length direction of the sedimentation chamber, the first spoiler, the second spoiler and the third spoiler are all arranged laterally in the sedimentation chamber, the distance from the top wall of the sedimentation chamber to the end of the first spoiler away from the top wall of the sedimentation chamber is L1, the distance from the top wall of the sedimentation chamber to the end of the second spoiler away from the top wall of the sedimentation chamber is L2, and the distance from the top wall of the sedimentation chamber to the end of the third spoiler away from the top wall of the sedimentation chamber is L3, wherein L1>L3>L2.

4. The winnowing machine system according to claim 3, characterized in that, The first spoiler and the second spoiler are both arranged obliquely in a direction away from the second separation chamber, and the third spoiler is arranged obliquely in a direction approaching the second separation chamber.

5. A winnowing machine system according to claim 3 or 4, characterized in that, The first spoiler is provided with a first inclined section and a second inclined section, the first inclined section is close to the top wall of the sedimentation chamber, and the second inclined section is located on the side of the first inclined section away from the sedimentation chamber, the angle between the first inclined section and the top wall of the sedimentation chamber is 60°-70°, and the angle between the second inclined section and the top wall of the sedimentation chamber is 70°-80°.

6. The air separation machine system according to claim 3 or 4, characterized in that, The first spoiler and the second spoiler are provided with ventilation holes.

7. The air classifier system according to claim 1, characterized in that The cross-sectional shape of the air intake box is trapezoidal, and the return air duct includes a main return duct and an auxiliary return duct connected to the air intake box, the main return duct is connected to the air inlet end of the main fan, and the auxiliary return duct is connected to the air inlet end of the auxiliary fan.

8. The air separation machine system according to claim 1, characterized in that, A collector is provided on the pipeline between the main fan and the first air nozzle to collect materials entering the pipeline along the first air nozzle.

9. The air classifier system according to claim 1, characterized in that, It further includes a dust removal device. A diverter valve is provided on the pipeline between the main blower and the first air nozzle, and the inlet end of the dust removal device is connected to the diverter valve.

10. A winnowing machine system according to claim 1, characterized in that, It further includes a feeding conveyor and a discharging conveyor. The discharging end of the feeding conveyor is docked with the material inlet end of the first separation chamber, and the discharging conveyor is arranged at the bottom of the sedimentation chamber to receive the material coming out from the third discharging port.

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