Horizontal dust removal screening device and compound winnowing machine

Abstract

The horizontal dust removal screening device comprises a rack, a feeding hopper, a material dispersing device, a fish scale screening plate, a screening device, a dust removal fan cover, a dust remover and a dust removal fan, an air inlet box is arranged on the rack, an air guide device is arranged in the air inlet box, and an auxiliary dust removal pipe is arranged on one side of the dust removal fan cover; an air volume adjusting device is arranged in the dust removal fan cover; the compound classificator further comprises a specific gravity screening device. The specific gravity screening device is arranged below the second screening plate; the specific gravity screening device comprises a specific gravity concentration table; the specific gravity concentration table and the second screening plate are arranged in a V shape; the device has the beneficial effects that dust and light impurities are further removed by improving the air inlet mode and installing the auxiliary dust removal device at the grain outlet of the scale screen, the power of a dust removal fan can be reduced, a small fan can be used, and energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain machinery, in particular to a horizontal dust removal and screening device and a compound air separator. BACKGROUND

[0002] The horizontal dust removal and screening device currently equipped with the compound air separator of our company adopts a dust removal hood installed above the fish scale screen, and the dust removal hood is connected with a dust remover and a dust removal fan to remove dust, light broken leaves and small straws. However, a 11-kilowatt No. 5 fan is required to be equipped, which has a large power and cannot completely remove the dust. After tracking analysis by technical personnel, it is found that the grain is spread on the fish scale screen, which has a large wind resistance, that is, a large wind loss, so that the No. 5 fan cannot completely remove the dust, and a larger fan is required to be equipped. The larger fan has a large floor area and is difficult to install, and energy is wasted.

[0003] In the existing patents, the early patent 202410421400.3 of our company, a compound air separator, discloses a vehicle frame, a machine frame, a specific gravity screening device and a horizontal air screen device. The horizontal air screen device is located above the specific gravity screening device. The specific gravity screening device includes a specific gravity air chamber, a specific gravity fan, a fan motor, a specific gravity fine selection table and an eccentric vibration device. The eccentric vibration device includes an eccentric drive motor, an eccentric wheel, an auxiliary support rod and an eccentric connecting rod. One end of the eccentric connecting rod and the auxiliary support rod is provided with a rubber sleeve and a nylon shaft. The horizontal air screen device includes a screen body, a feed hopper, a dragon type bulk material device, a dust removal hood, a dust remover and a dust removal fan. The horizontal air screen device requires a No. 5 dust removal fan to normally remove dust, which is not very clean and needs to be improved.

[0004] In addition, the application number 202323156153.9, a multifunctional horizontal air screen, discloses a screen body, a screen assembly arranged in the screen body, a power device for driving the screen assembly to vibrate and a light impurity removal device arranged on the screen body. The lower part of the screen body is sequentially provided with a small impurity connecting hopper, a large impurity outlet and a finished product outlet. The screen assembly is provided with a screen cleaning ball for cleaning the screen. The screen assembly includes a first screen plate and a second screen plate arranged in the screen body from top to bottom. The first screen plate is provided with screen holes. The second screen plate is provided with fish scale screen holes. The light impurity removal device includes a dust removal hood, a dust remover and an air extractor. The air inlet needs to pass through the grain laid on the screen plate, which has a large wind resistance and a poor effect of removing light impurities. The power of the air extractor is large, and needs to be solved. Practical new type content

[0005] The purpose of the present application is to provide a horizontal dust removal and screening device and a compound air separator. By improving the air inlet mode, an auxiliary dust removal device is installed at the grain outlet of the fish scale screen, which further removes dust and light impurities. The power of the dust removal fan can be reduced, and a small fan can be used to reduce energy consumption.

[0006] To achieve the above object, the technical scheme adopted by the present application is:

[0007] A horizontal dust removal and screening device, comprising a rack, a feeding hopper installed at one end of the rack, a bulk material device installed below the feeding hopper, a fish scale sieve plate installed on the rack and used for receiving the material of the bulk material device, and a dust removal air cover arranged above the fish scale sieve plate, wherein one end of the fish scale sieve plate away from the bulk material device is provided with a material outlet; an air inlet box is arranged on the rack below the fish scale sieve plate, the top surface of the air inlet box is open, and the fish scale sieve plate constitutes the top surface of the air inlet box; a wind guide device is arranged in the air inlet box, one side of the dust removal air cover is provided with an auxiliary dust removal pipe; the wind guide device is in communication with one end of the auxiliary dust removal pipe and the air inlet of the dust removal air cover; the material outlet is located in the auxiliary dust removal pipe, so that the wind in the auxiliary dust removal pipe can suck away the fine particles and light straws in the grain at the material outlet; the other end of the auxiliary dust removal pipe and the air outlet of the dust removal air cover are in communication through a wind guide pipe; the wind guide pipe is in communication with a dust remover, and the dust remover is in communication with a dust removal fan.

[0008] Further, a wind volume adjusting device is arranged in the dust removal air cover; the wind volume adjusting device comprises a handle and an adjusting plate, the handle is arranged outside the dust removal air cover, the adjusting plate is arranged in the dust removal air cover, one end of the adjusting plate is fixed with one end of the handle, and the other end of the adjusting plate swings along one side wall of the dust removal air cover.

[0009] Further, the air inlet box is provided with a first air inlet and a second air inlet, the first air inlet is located on the right side surface of the air inlet box, and the second air inlet is located on the bottom surface of the air inlet box; the wind guide device comprises a first flow guide plate arranged above the first air inlet and located below the right side of the fish scale sieve plate, a second flow guide plate located below the left side of the fish scale sieve plate, and a third flow guide plate located below the second flow guide plate; the first flow guide plate, the second flow guide plate, and the third flow guide plate are all arranged in the air inlet box; the third flow guide plate is arc-shaped, one end of the arc-shaped third flow guide plate and the first flow guide plate constitute an air inlet channel, and the other end of the third flow guide plate and the second flow guide plate constitute an auxiliary dust removal air inlet.

[0010] Further, the device further comprises a screening device arranged on the rack, the screening device comprises a first screening plate and a second screening plate arranged on the rack, and the first screening plate is located above the second screening plate; the first screening plate is located below the material outlet; cleaning balls are arranged below the first screening plate and the second screening plate; a vibration motor is arranged on the rack and used for driving the first screening plate and the second screening plate to vibrate; one end of the second screening plate away from the fish scale sieve plate is respectively provided with a large impurity outlet, a finished grain box, and a small impurity outlet; the finished grain box is provided with a finished grain outlet.

[0011] The combined winnowing machine further comprises a specific gravity screening device arranged on the frame; the specific gravity screening device is arranged below the second screening plate.

[0012] Further, the specific gravity screening device comprises a specific gravity refining table, an eccentric vibration device arranged between the specific gravity refining table and the frame; the eccentric vibration device comprises an eccentric driving motor arranged on the frame, an eccentric wheel in driving connection with the eccentric driving motor, and an eccentric driving link having one end rotatably connected with the edge of the eccentric wheel; the other end of the eccentric driving link is rotatably connected with one end of the specific gravity refining table; the other end of the specific gravity refining table is rotatably connected with the frame.

[0013] Further, the specific gravity screening device further comprises a specific gravity air chamber arranged on the frame, a specific gravity fan arranged in the specific gravity air chamber, and a fan motor for driving the specific gravity fan to rotate; the air outlet of the specific gravity air chamber is directed to the specific gravity refining table.

[0014] Further, the specific gravity refining table and the second screening plate are arranged in a V shape; the finished grain outlet is located above the higher end of the specific gravity refining table.

[0015] Further, the specific gravity screening device further comprises a specific gravity impurity removal port and a qualified grain outlet; the frame is further provided with a large impurity collection port and a small impurity collection port.

[0016] Further, the frame is provided with a horizontal adjusting device and a walking wheel; the horizontal adjusting device can adjust the machine to be horizontal during the operation of the equipment, so as to avoid the angle part of the frame being suspended and unstable during the operation; the walking wheel facilitates short-distance transfer.

[0017] The positive effects of the present application are as follows:

[0018] The present application is provided with an air inlet box, and the air inlet box is provided with an air guide device; the air guide device divides the air inlet into two parts; one part is directly connected to the lower part of the fish scale screen, and the dust and light impurities are collected by the dust removal hood; the other part is connected to the auxiliary dust removal pipe, and the material passing through the grain outlet is blown upward again, so as to collect the light impurities such as wheat peel and broken straw in the material; the auxiliary dust removal pipe and the dust removal hood are combined through the air guide pipe, and then collected by the dust removal fan and the dust collector; since the grain in the dust removal pipe is relatively thin, the air can pass through easily, the air resistance is small, and the impurities can be collected better, so that the power of the dust removal fan can be reduced.

[0019] The air volume adjusting device is arranged; the angle of the adjusting plate in the dust removal hood is adjusted by the handle, so as to adjust the air volume, balance the air volume in the dust removal pipe and the dust removal hood, and balance the dust removal of the two parts as much as possible.

[0020] By installing auxiliary dust removal pipes and guide plates on the duplex air separator, the power of the dust removal fan can be reduced, and the overall size can be reduced. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application;

[0022] Figure 2 This is a structural diagram of the dust collector hood and air guide device;

[0023] Figure 3 This is a schematic diagram of the air volume regulating device in Example 2;

[0024] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of this application;

[0025] Figure 5 This is a schematic diagram of a compound air separator without the dust removal fan and dust collector.

[0026] In the picture:

[0027] 1-Frame, 2-First screening plate, 3-Second screening plate, 4-Finished grain bin, 5-Large miscellaneous outlet, 6-Finished grain outlet, 7-Small miscellaneous outlet, 8-Cleaning ball, 9-Vibration motor, 10-Second guide plate, 11-Third guide plate, 111-Auxiliary dust removal air inlet, 12-First guide plate, 13-Second air inlet, 14-First air inlet, 15-Fish scale screen plate, 16-Bulk material device, 17-Feeding hopper, 18-Dust collector, 181-Airlock, 182-Dust removal light miscellaneous outlet, 19-Dust removal fan, 20-Dust removal hood, 21-Handle, 211-Adjusting plate, 22-Auxiliary dust removal pipe;

[0028] 25-Specific gravity sorting table, 26-Qualified grain outlet, 27-Large impurity collection port, 28-Fan motor, 29-Car frame, 30-Specific gravity fan, 31-Small impurity collection port, 32-Eccentric drive motor, 33-Eccentric drive linkage, 34-Specific gravity impurity discharge port, 35-Horizontal adjustment device, 36-Walking wheel. Detailed Implementation

[0029] Example 1

[0030] like Figures 1 to 2 As shown in the attached diagram, the arrows indicate the direction of air (wind) flow, which helps to understand the dust removal process.

[0031] A horizontal dust removal and screening device includes a frame 1, a feed hopper 17 installed at one end of the frame 1, a material distribution device 16 installed below the feed hopper 17, a fish scale screen plate 15 installed on the frame 1 for receiving material from the material distribution device 16, and a dust removal hood 20 disposed above the fish scale screen plate 15. The end of the fish scale screen plate 15 away from the material distribution device 16 is provided with a material outlet.

[0032] like Figure 2 As shown, the frame 1 is equipped with an air inlet box, which is located below the fish scale screen plate 15; the top surface of the air inlet box is open, and the fish scale screen plate 15 forms the top surface of the air inlet box.

[0033] An auxiliary dust removal pipe 22 is provided on one side of the dust removal hood 20; the material outlet is located inside the auxiliary dust removal pipe 22, which facilitates the air in the auxiliary dust removal pipe 22 to remove fine particles and light straw from the grain at the material outlet; dust and light impurities are discharged through the dust removal hood 20 and the auxiliary dust removal pipe 22.

[0034] Dust collector hood 20 is used to collect dust and very light impurities such as wheat husks or very fine straw from the grain on the fish scale screen plate 15; auxiliary dust collector pipe 22 is used to collect dust and relatively light impurities such as not very fine straw from the semi-finished grain after passing through the fish scale screen plate 15 (that is, after the material falls out of the material outlet).

[0035] In order to guide the air intake and concentrate the air intake, so as to facilitate the collection of impurities by the dust removal hood 20 and the auxiliary dust removal pipe 22, an air guide device is provided in the air intake box;

[0036] The detailed structure is as follows: the air guide device is connected to one end of the auxiliary dust removal pipe 22 and the air inlet of the dust removal hood 20 respectively; the other end of the auxiliary dust removal pipe 22 and the air outlet of the dust removal hood 20 are connected through the air guide pipe; the air guide pipe is connected to the dust collector 18, and the dust collector 18 is connected to the dust removal fan 19.

[0037] Since an auxiliary dust removal pipe 22 is provided, it is necessary to increase the air intake area. This is achieved by the following arrangement: the air intake box is provided with a first air intake 14 and a second air intake 13. The first air intake 14 is located on the right side of the air intake box, and the second air intake 13 is located on the bottom side of the air intake box.

[0038] The air guide device comprises a first air guide plate 12 arranged above the first air inlet and below the right side of the fish scale screen 15, a second air guide plate 10 arranged below the left side of the fish scale screen 15, and a third air guide plate 11 arranged below the second air guide plate 10; the first air guide plate 12, the second air guide plate 10 and the third air guide plate 11 are arranged in the air inlet box; the third air guide plate 11 is arc-shaped, one end of the arc-shaped third air guide plate 12 forms an air inlet channel with the first air guide plate 12, and the other end of the third air guide plate 11 forms an auxiliary dust removal air inlet 111 with the second air guide plate 10.

[0039] In order to improve the wind speed and improve the dust removal effect, the cross-sectional area of the auxiliary dust removal air inlet 111 is smaller than that of the air inlet channel, and the ratio of the cross-sectional area of the air inlet channel to that of the auxiliary dust removal air inlet 111 is 5 / 1, so that the wind speed in the auxiliary dust removal pipe 22 can be improved, the fine and small particles and light straw in the semi-finished grain can be blown up, and the dust removal efficiency can be improved.

[0040] The horizontal dust removal and screening device further comprises a screening device arranged on the frame 1, the screening device comprising a first screening plate 2 and a second screening plate 3 arranged on the frame 1, the first screening plate 2 being arranged above the second screening plate 3; the first screening plate 2 is arranged below the material outlet; cleaning balls 8 are arranged below the first screening plate 2 and the second screening plate 3, the cleaning balls 8 being used to prevent the grain from blocking the screen holes of the screening plates and improve the screening efficiency; a vibration motor 9 is arranged on the frame 1 to drive the first screening plate 2 and the second screening plate 3 to vibrate; one end of the second screening plate 3 away from the fish scale screen 15 is respectively provided with a large impurity outlet 5, a finished grain box 4 and a small impurity outlet 7; the finished grain box 4 is provided with a finished grain outlet 6.

[0041] The working process of the present application is as follows:

[0042] The raw materials are added to the feeding hopper 17, the raw materials fall from the feeding hopper 17 to the scattering device 16, the scattering device 16 uniformly spreads the raw materials on the fish scale screen 15, the vibration motor 9 drives the fish scale screen 15 to vibrate, the raw materials are conveyed to the two screening plates, the raw materials fall from the screening plates into the finished grain box 4, and finally are collected through the finished grain outlet 6;

[0043] The large impurities are collected through the large impurity outlet 5 at the tail of the horizontal air screen device, and the small impurities are collected through the small impurity outlet 7 arranged below the horizontal air screen device.

[0044] The small floating materials such as dust and debris are collected by the dust removal fan 19, collected by the dust removal air cover 20, and then enter the dust remover 18 through the air guide pipe.

[0045] The setting can reduce the power of the dust removal fan 19. Similarly, the power of the dust removal fan 19 is reduced from 11 kW to 7.5 kW, and the energy-saving effect is remarkable.

[0046] Embodiment 2

[0047] The difference between this embodiment and embodiment 1 is that:

[0048] As shown in Figure 3 ,

[0049] The dust removal hood 20 is provided with a wind volume adjusting device; the wind volume adjusting device includes a handle 21 and an adjusting plate 211, the handle 21 is arranged outside the dust removal hood 20, the adjusting plate 211 is located at the throat of the dust removal hood 20, which is convenient for adjusting the wind volume, one end of the adjusting plate 211 is fixed with one end of the handle 21, and the other end of the adjusting plate 211 swings along one side wall of the dust removal hood 20. A rotating shaft 212 is rotatably connected to the dust removal hood 20, a part of the rotating shaft 212 is exposed outside the dust removal hood 20, and the handle 21 is fixed with the exposed part of the rotating shaft 212; the adjusting plate 211 is fixed with the part of the rotating shaft 212 located inside the dust removal hood 20.

[0050] The adjusting plate 211 is arranged to facilitate the control of the wind volume in the dust removal hood 20, balance the wind volume in the auxiliary dust removal pipe 22 and the dust removal hood 20, and maximize the collection of dust and debris.

[0051] Embodiment 3

[0052] The difference between this embodiment and embodiment 1 is that the horizontal dust removal and screening device of embodiment 1 is applied to a compound air separator.

[0053] As shown in Figures 4-5 ,

[0054] A compound air separator further comprises a specific gravity screening device arranged on the frame 29; the specific gravity screening device is arranged below the second screening plate 2 of the horizontal dust removal and screening device.

[0055] The specific gravity screening device comprises a specific gravity fine selection table 25 and an eccentric vibration device installed between the specific gravity fine selection table 25 and the frame 29; the eccentric vibration device comprises an eccentric drive motor 32 installed on the frame 29, an eccentric wheel in transmission connection with the eccentric drive motor 32, and an eccentric drive connecting rod 33 rotatably connected with the edge part of the eccentric wheel; one end of the eccentric drive connecting rod 33 is rotatably connected with one end of the specific gravity fine selection table 25; the other end of the specific gravity fine selection table 25 is rotatably connected with the frame 29.

[0056] The specific gravity screening device further comprises a specific gravity air chamber installed on the frame 29, a specific gravity air blower 30 installed in the specific gravity air chamber, and a fan motor 28 for driving the specific gravity air blower to rotate; the air outlet of the specific gravity air chamber is directed towards the specific gravity cleaning table 25.

[0057] The specific gravity cleaning table 25 is arranged in a V shape with the screening plates of the horizontal dust removal screening device; the finished grain outlet 6 is located above the higher end of the specific gravity cleaning table 25.

[0058] From Figure 4 Looking at the horizontal dust removal screening device, one end of the fish scale screen 15 is higher than one end of the finished grain outlet 6; this facilitates the smooth separation of finished grain and impurities;

[0059] The end of the specific gravity cleaning table 25 close to the finished grain outlet 6 is higher than the other end of the specific gravity cleaning table 25,

[0060] The specific gravity screening device further comprises a specific gravity impurity removal port 34 and a qualified grain outlet 26; the frame 29 is further provided with a large impurity collection port 27 and a small impurity collection port 31.

[0061] The frame 29 is provided with a horizontal adjustment device 35 and a walking wheel 36. The horizontal adjustment device 35 can adjust the level of the entire device, facilitating normal operation of the equipment; the walking wheel 36 facilitates close-range use.

[0062] The working process of the embodiment,

[0063] The raw materials are added to the feed hopper 17, and the raw materials fall from the feed hopper 17 to the bulk material device 16, which uniformly spreads the raw materials on the fish scale screen 15. The vibration motor 9 drives the fish scale screen 15 to vibrate, conveying the raw materials to the two screening plates. The raw materials fall from the screening plates into the finished grain box 4, and are finally collected through the finished grain outlet 6; the finished grain falls on the specific gravity cleaning table 25, and the qualified grain is collected at the tail of the specific gravity cleaning table 25 and collected through the qualified grain outlet 26;

[0064] The large impurities are collected through the large impurity outlet 19 at the tail of the horizontal air screening device 17, and the small impurities are collected through the small impurity outlet 23 below the horizontal air screening device 17;

[0065] The fine floating materials such as dust and debris are collected through the dust removal air cover 20 and the auxiliary dust removal pipe 22 under the action of the dust removal fan 19, collected through the air guide pipe and the dust collector 18 under the action of the wind force of the dust removal fan 19, and discharged through the light impurity outlet 11; the dust removal fan 19 is in communication with the dust collector 18, and the dust collector 18 is provided with a closed air valve 181 for discharging impurities and a dust removal light impurity outlet 182 in communication with the closed air valve 181; the closed air valve 181 is arranged to stabilize the pressure in the exhaust system and prevent air leakage of the dust collector 18, thereby affecting the dust removal effect.

[0066] The grain separated by the horizontal air screen device is screened again by the specific gravity selection table 25. The screen body of the specific gravity selection table 25 is reciprocatingly vibrated under the driving of the eccentric driving motor 5. The grain is classified by the re-screening. Meanwhile, the specific gravity fan 30 in the specific gravity air chamber removes the impurities from the grain, and the relatively large impurities are discharged. The above-described embodiment describes the content in more detail and concretely, expresses the preferred embodiment of the present application, and is only used for explaining the technical idea and characteristics of the present application. The purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, but is not limited to the present application. The patent range of the present application cannot be limited to the present embodiment. That is, any equivalent changes or modifications made according to the spirit disclosed by the present application, the partial improvement of the system inside and the change between the subsystems, the transformation, etc. without departing from the structure of the present application are still within the patent range of the present application.

Claims

1. A horizontal dust removal and screening device, comprising a frame (1), a feed hopper (17) mounted at one end of the frame (1), a bulk material device (16) mounted below the feed hopper (17), a fish scale screen (15) mounted on the frame (1) and used to receive the material of the bulk material device (16), and a dust removal hood (20) arranged above the fish scale screen (15), wherein the fish scale screen (15) is provided with a material outlet at the end away from the bulk material device (16); characterized in that, The rack (1) is provided with an air inlet box below the fish scale screen (15), the top surface of the air inlet box is open, and the fish scale screen (15) constitutes the top surface of the air inlet box; the air inlet box is provided with an air guide device; the dust removal hood (20) is provided with an auxiliary dust removal pipe (22) on one side; the air guide device is in communication with one end of the auxiliary dust removal pipe (22) and the air inlet of the dust removal hood (20); the material outlet is located in the auxiliary dust removal pipe (22); the other end of the auxiliary dust removal pipe (22) and the air outlet of the dust removal hood (20) are in communication through an air guide pipe; the air guide pipe is in communication with the dust remover (18), and the dust remover (18) is in communication with the dust removal fan (19).

2. A horizontal dusting and screening apparatus according to claim 1, characterized in that The dust removal hood (20) is provided with a wind volume adjusting device; the wind volume adjusting device comprises a handle (21) and an adjusting plate (211), the handle (21) is arranged outside the dust removal hood (20), and the handle (21) is rotatably connected with the dust removal hood (20); the adjusting plate (211) is located in the dust removal hood (20), one end of the adjusting plate (211) is fixed with one end of the handle (21), and the other end of the adjusting plate (211) swings along one side wall of the dust removal hood (20).

3. A horizontal dusting and screening apparatus according to claim 1, wherein, The air inlet box is provided with a first air inlet (14) and a second air inlet (13), the first air inlet (14) is located on the right side of the air inlet box, and the second air inlet (13) is located on the bottom surface of the air inlet box; the air guide device comprises a first guide plate (12) arranged above the first air inlet and located below the right of the fish scale screen (15), a second guide plate (10) located below the left of the fish scale screen (15), and a third guide plate (11) located below the second guide plate (10); the first guide plate (12), the second guide plate (10) and the third guide plate (11) are all arranged in the air inlet box; the third guide plate (11) is arc-shaped, one end of the arc-shaped third guide plate (11) and the first guide plate (12) constitute an air inlet channel, and the other end of the third guide plate (11) and the second guide plate (10) constitute an auxiliary dust removal air inlet (111).

4. A horizontal dusting and screening apparatus according to claim 1, wherein Further comprising a screening device arranged on the rack (1), the screening device comprises a first screening plate (2) and a second screening plate (3) arranged on the rack (1), and the first screening plate (2) is located above the second screening plate (3); the first screening plate (2) is located below the material outlet; the first screening plate (2) and the second screening plate (3) are both provided with cleaning balls (8) below; the rack (1) is provided with a vibration motor (9) for driving the first screening plate (2) and the second screening plate (3) to vibrate; one end of the second screening plate (3) away from the fish scale screen (15) is respectively provided with a large impurity outlet (5), a finished grain box (4) and a small impurity outlet (7); the finished grain box (4) is provided with a finished grain outlet (6).

5. A compound air separator using the horizontal dust removal and screening device according to claim 4, characterized in that, Further comprising a specific gravity screening device arranged on the frame (29); the specific gravity screening device is arranged below the second screening plate (3).

6. A compound air table according to claim 5, wherein The specific gravity screening device comprises a specific gravity concentrating table (25), an eccentric vibration device installed between the specific gravity concentrating table (25) and a frame (29); the eccentric vibration device comprises an eccentric driving motor (32) installed on the frame (29), an eccentric wheel in driving connection with the eccentric driving motor (32), and an eccentric driving connecting rod (33) in rotary connection with one end of the eccentric wheel; the other end of the eccentric driving connecting rod (33) is in rotary connection with one end of the specific gravity concentrating table (25); the other end of the specific gravity concentrating table (25) is in rotary connection with the frame (29).

7. A compound air table according to claim 6, wherein The specific gravity screening device further comprises a specific gravity air chamber installed on the frame (29), a specific gravity fan (30) installed in the specific gravity air chamber, and a fan motor (28) for driving the specific gravity fan to rotate; an air outlet of the specific gravity air chamber is directed towards the specific gravity concentrating table (25).

8. A compound air table according to claim 7, wherein The specific gravity concentrating table (25) and the second screening plate (3) are arranged in a V shape; a finished grain outlet (6) is located above the higher end of the specific gravity concentrating table (25).

9. A compound air table according to claim 8, wherein The specific gravity screening device further comprises a specific gravity impurity discharging port (34) and a qualified grain outlet (26); the frame (29) is further provided with a large impurity collecting port (27) and a small impurity collecting port (31).

10. A compound air table according to claim 9, wherein The frame (29) is provided with a horizontal adjusting device (35) and a walking wheel (36).

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