CN107225090B - Rotary combined multi-layer screen - Google Patents

Abstract

The invention relates to a rotary combined multilayer sieve, which comprises a rack, a sieve body hung on the rack, a feeding system fixed at the top of the rack and a power transmission system for driving the sieve body to do plane rotary motion, wherein the sieve body comprises an upper layer sieve frame, a lower layer sieve frame, a uniform batching device, a discharging channel and the power transmission system, and a plurality of layers of sieve grid groups are arranged in the upper layer sieve frame and the upper layer sieve frame.

Description

Rotary combined multi-layer screen

technical field

The invention relates to the technical field of grain screening and impurity removal equipment, in particular to a rotary combined multi-layer sieve.

Background technique

Before the grains are put into the warehouse, because the grains contain impurities and dust, if the impurities are contained in the grains, it will cause the grains to heat up and become moldy, and it will also make the flow of the grains out of the warehouses difficult, resulting in serious losses of grains. Therefore, the grain must be cleaned before storage, and the impurities and some dust in the grain must be screened out. At present, there are many kinds of equipment for screening and dedusting grain on the market, such as vibrating screens, flat rotary screens, etc., but most of the existing screening and dedusting equipment have single functions and low screening efficiency, which cannot meet the screening needs of large grain depots.

Contents of the invention

To sum up, in order to overcome the deficiencies of the existing technical problems, the present invention provides a rotary combined multi-layer screen, which is based on the original plane rotary screen, increasing the number of screen grids, and setting multi-layer screens that work at the same time By setting up a uniform batching device, the grain materials to be screened and removed are evenly screened on different screen grids to remove large and small particles of impurities in the grain. At the same time, a ventilation system is set to extract the dust in the grain, etc. Light and fine impurities can be screened to achieve the purpose of dust removal and impurity removal. Multi-layer sieve grids increase the efficiency of screening and removal of impurities to meet the screening needs of large grain depots.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A rotary combined multi-layer screen, which includes a frame, a screen body suspended on the frame, a feeding system fixed on the top of the frame, and a power transmission system that drives the screen body to perform plane rotary motion. The sieve body includes an upper screen frame, a lower screen frame, a uniform batcher, a discharge channel and a power transmission system. The upper screen frame and the upper screen frame are equipped with multi-layer screen groups. The upper sieve grid, lower sieve grid and bottom plate are arranged in turn. The pores of the lower sieve grid are smaller than the pores of the upper sieve grid. A power transmission system is set between the upper screen frame and the lower screen frame. The power transmission system drives the upper screen frame and the lower screen frame The screen frame rotates in a plane, one side of the upper screen frame and the lower screen frame is provided with a discharge channel, the other side of the upper screen frame and the lower screen frame is provided with a uniform batching device, and the upper screen frame is provided with a There is a feeding hopper, and the feeding hopper is connected to the feeding system and the uniform batcher. The uniform batcher distributes the material evenly and sends it to the upper screen grid of the multi-layer screen grid group. The described discharge channel includes a large miscellaneous channel, The small miscellaneous passage and the clean grain passage, the large miscellaneous passage connects the upper sieve grids of all the sieve lattice groups, the small miscellaneous passage connects the bottom plates of all the sieve lattice groups, and the clean grain passage connects the lower sieve lattices of all the sieve lattice groups.

The technical solution of the present invention can also be realized in the following way: the feed system includes a feed shell fixed on the top of the frame, a feed port is arranged on the feed shell, and an upper layer guide material is arranged inside the feed shell. Plate, upper level material plate, lower material guide plate and lower baffle plate, the upper level material plate is hinged on the feed shell, the two ends of the upper layer guide plate are fixed with the feed shell, the upper layer level plate and the upper The material guide plate forms an upper feed channel with a funnel-shaped cross-section. There are gaps between the upper material guide plate, the upper layer uniform plate and the top plate of the feed housing. The lower material guide plate and the lower baffle plate The material shell is fixed, and the lower layer guide plate and the lower layer baffle form a lower feed channel with a funnel-shaped cross-section. There is a gap between the lower layer guide plate and the upper layer uniform material plate. There is a gap between them, the upper opening of the upper feeding channel corresponds to the feeding port, the lower opening of the upper feeding channel corresponds to the upper opening of the lower feeding channel, and the lower opening of the lower feeding channel corresponds to the upper opening of the upper screen frame. Set of feed hoppers.

The technical solution of the present invention can also be realized in the following way: the lower opening of the upper feed channel is provided with a leveling device, and the described leveling device includes a leveling shaft, a leveling cam, an adjusting arm, an adjusting plate, Adjust the screw and the adjustment shaft. The material leveling shaft is mounted on the feed shell and is connected to the feed shell in relative rotation. A material leveling motor is arranged outside the material feeding shell, and the leveling motor drives the material leveling The shaft rotates, and the leveling shaft is provided with a leveling cam, which is in contact with the bottom surface of the upper level leveling plate, and an adjusting arm is clamped on the leveling shaft, and the leveling shaft rotates relative to the adjusting arm, The adjustment arm is provided with an adjustment plate, which corresponds to the lower opening of the upper feed channel, and the adjustment plate is hoisted on the adjustment shaft by an adjustment screw.

The technical solution of the present invention can also be achieved in this way: the frame is provided with an air inlet pipe, the lower end of the air inlet pipe is connected to the clean grain channel, and the upper end of the air inlet pipe is connected to the feeding shell The exhaust channel in the body, one side of the feed housing is provided with an air outlet, the upper air deflector and the lower deflector are arranged in the feed housing, the upper deflector and the top plate of the feed housing There is a gap between them, the gap between the upper air guide plate and the top plate of the feed housing, the gap between the upper uniform material plate and the top plate of the feed housing, the gap between the upper material guide plate and the top plate of the feed housing The gaps are connected with each other to form the upper air exhaust channel, there is a gap between the upper air deflector and the lower air deflector, the gap between the upper air deflector and the lower air deflector, the lower material guide and the upper uniform material The gaps between the plates are connected with each other to form the lower exhaust channel, the upper exhaust channel is connected to the air outlet on the housing, the lower exhaust channel is connected to the air inlet pipe arranged on the frame, and the lower baffle plate in the feed housing is connected to the upper guide. A reversing air channel is formed between the material plates, and the lower air exhaust channel is connected to the upper layer air exhaust channel through the reversing air channel.

The technical solution of the present invention can also be realized in the following way: a lower V-shaped portion is provided on the lower air deflector plate, the lower V-shaped portion is connected with the lower material guide plate, and a lower dust-exhausting auger is arranged inside the lower V-shaped portion. The side of the feed shell is provided with a dust discharge channel, and the lower V-shaped part is connected to the dust discharge channel through the lower dust discharge auger.

The technical solution of the present invention can also be realized in the following way: the upper V-shaped part is provided on the upper wind deflector, the upper dust discharge auger is arranged inside the upper V-shaped part, and the upper V-shaped part discharges dust through the upper layer. The auger is connected with the dust discharge channel.

The technical solution of the present invention can also be realized as follows: the uniform batcher includes a frame body, a partition, a connecting block and a locking device, the upper end of the frame body is open, and the upper end opening of the frame body is connected to the feed hopper, A plurality of partitions are arranged in the frame, and the partition divides the inner cavity of the frame into a plurality of vertical feeding channels. The inner side of the frame is provided with a plurality of batching ports, and the batching ports are connected to the frame through the feeding channels. The upper end of the body is open, and an inclined feeding plate is arranged inside the batching port, and the feeding plate closes the feeding channel, and the multiple batching ports correspond to the upper screen grids of different screen grid groups respectively, and the frame body The lower part is provided with a connecting block, and the frame body is hinged to the lower part of the lower screen frame through the connecting block, and the upper part of the frame body is locked with the upper part of the upper screen frame by a locking device.

The beneficial effects of the present invention are:

1. On the basis of the original plane rotary sieve, the present invention increases the number of sieve grids, sets multi-layer sieve grids that work at the same time, and arranges a uniform batching device to make the grain materials to be screened and removed evenly enter different sieve grids Screening is carried out to remove large and small particles of impurities in the grain. At the same time, a ventilation system is set up to extract light and fine impurities such as dust in the grain to achieve the purpose of screening dust and impurities. Multi-layer sieves increase the efficiency of screening and impurities. Meet the screening needs of large grain depots.

2. The upper screen frame and the upper screen frame of the present invention are provided with multi-layer sieve grid groups, and the uniform batching device distributes the materials evenly into the upper screen grids of the multi-layer screen grid group, and the materials are evenly distributed by the uniform batcher. It is sent to the upper sieve of each sieve group, and the sieve body makes a plane rotary motion, and the multi-layer sieve group simultaneously screens the materials. Among them, the materials are screened by the upper sieve, and the clean grain, small impurities and dust Light and fine impurities fall from the sieve hole of the upper sieve to the lower sieve, and the impurities with larger particles enter the large miscellaneous channel along the upper sieve, and the clean grain and impurities entering the lower sieve are screened by the lower sieve, and the clean grain From the clean grain channel, small impurities fall into the bottom plate, and enter the small miscellaneous channel along the bottom plate to be discharged. The multi-layer sieve grid group simultaneously screens the materials, with high screening efficiency, high output, and good cleaning and screening effects.

3. The uniform batching device of the present invention divides the inner cavity of the frame into a plurality of vertical feeding passages by the partition, and then sets the batching port on the inner side of the frame body. The height of the batching port is respectively higher than that of the screen body The heights of the sieve grids are the same, and then a feeding plate is set on the lower edge of the batching port. The feeding plate closes the feeding channel, and the grain entering from the upper opening of the frame is fed downward along the feeding channel. After being blocked by the plate, it flows out along the feeding plate and the batching port. Since the position of the batching port corresponds to the position of the screen grid, the grain material enters the screen grid. By setting multiple batching ports corresponding to the sieve grids in the sieve body, the sieve grids in the sieve body can be evenly dosed at the same time, and the grain materials can be evenly distributed on the multi-layer sieve grids. The structure is simple, the function is powerful, and the concept is ingenious. Realize multi-layer sieve feeding at the same time, and the ingredients are even.

4. The opening of the lower end of the upper feed channel of the present invention is provided with a leveling device, which drives the leveling cam to rotate through the leveling shaft, so that the upper level leveling plate continuously swings up and down, and evenly discharges the material. At the same time, the size of the lower opening of the upper feeding channel is adjusted through the adjusting plate and the adjusting screw to further improve the uniform material distribution effect, and the size of the lower opening of the upper feeding channel is adjusted to realize feeding according to actual production needs.

5. The mouth of the lower end of the air inlet pipe of the present invention is connected to the clean grain passage, and the upper end of the air inlet pipe is connected to the exhaust passage arranged in the feed housing. The light and fine impurities and dust in the clean grain are sucked away to achieve the purpose of dust removal, so that the function of the present invention is diverse, so that the present invention can carry out screening, impurity removal, classification and dust removal treatment on grain materials, and one machine is multi-purpose.

6. The ventilation channel of the present invention includes an upper layer ventilation channel, a lower layer ventilation channel and a reversing air channel, and the air inlet pipe is connected with the lower layer ventilation channel and the clean grain channel, and the light and fine impurities such as dust in the extracted clean grain pass through the lower V-shaped In the lower V-shaped space, the space of the lower V-shaped part is larger than that of the air inlet pipe. In the lower V-shaped space, the space increases, the airflow velocity is slow, and the light and fine impurities in the airflow settle in the lower V-shaped space and are removed by the lower dust exhaust. After that, the airflow enters the reversing air duct for reversing, the space shrinks again, and the flow rate increases. When the airflow passes through the grain material flow of the lower feeding channel and the upper feeding channel, the dust and light impurities in the grain material flow will be removed. When it is taken away, when passing through the upper V-shaped part, the space increases again, and the dust and light impurities in the airflow are settled and removed again. So as to realize the secondary air extraction and dust removal, the design is novel and the concept is ingenious.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of the homogenizing device of the present invention;

Fig. 3 is the structural representation of uniform distributor of the present invention;

Fig. 4 is a schematic left view of Fig. 3 of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, Figure 2, Figure 3, and Figure 4, a rotary combined multi-layer screen includes a frame 1, a screen body 2 suspended on the frame 1, and a feed system fixed on the top of the frame 1 4. And the power transmission system 3 that drives the sieve body 2 to perform plane rotary motion. The sieve body 2 includes an upper screen frame 21, a lower screen frame 22, a uniform batcher 23, a discharge channel 24 and a power transmission system 3. The above-mentioned upper screen frame 21 and the upper screen frame 21 are provided with two layers of screen grid groups 25, a total of four layers of screen grid groups 25, which are respectively the upper layer screen grid group, the middle layer screen grid group, the lower layer screen grid group and the bottom screen grid group. The grid group, wherein the upper screen grid group and the middle screen grid group are located in the upper screen frame 21, and the lower screen grid group and the bottom screen grid group are located in the lower screen frame 22. The four-layer sieve grid group 25 has the same structure, and all include an upper sieve grid 251, a lower sieve grid 252, and a bottom plate 253 arranged sequentially from top to bottom. The pores of the lower sieve grid 252 are smaller than the pores of the upper sieve grid 251. A power transmission system 3 is set between the lower screen frames 22, and the power transmission system 3 drives the upper screen frame 21 and the lower screen frame 22 to perform plane rotary motion, and one side of the upper screen frame 21 and the lower screen frame 22 is provided with a discharge Passage 24, discharge passage 24 comprises large miscellaneous passage, small miscellaneous passage and clean grain passage 241, and described large miscellaneous passage is connected with the upper sieve grid 251 of all sieve lattice groups 25, and small miscellaneous passage is connected with the bottom plate of all sieve lattice groups 25 253, the clean grain channel 241 communicates with the lower sieve grids 252 of all sieve grid groups 25.

The other side of the upper sieve frame 21 and the lower sieve frame 22 is provided with a uniform batcher 23, the upper sieve frame 21 is provided with a feed hopper 26, and the feed hopper 26 communicates with the feed system 4 and the even batcher 23, and feeds The feed system 4 includes a feed housing 41 fixed on the top of the frame 1, a feed inlet 42 is arranged on the feed housing 41, an upper layer guide plate 43, an upper layer uniform plate 44, The lower material guide plate 45 and the lower baffle plate 46, the upper layer uniform material plate 44 is hinged on the feed housing 41, the two ends of the upper layer material guide plate 43 are fixed with the feed housing 41, the upper layer uniform material plate 44 is connected with the upper layer The feed guide plate 43 forms a funnel-shaped upper feed channel 47 with a cross-sectional shape. There is a gap between the upper feed guide plate 43, the upper uniform feed plate 44 and the top plate of the feed housing 41. The lower feed guide plate 45 And the lower baffle plate 46 is fixed with the feed housing 41, the lower baffle plate 45 and the lower baffle plate 46 form a lower feed channel 48 with a funnel-shaped cross-section, and there is a Gap, there is a gap between the lower baffle plate 46 and the upper material guide plate 43, the upper opening of the upper feeding channel 47 corresponds to the feeding port 42, and the lower opening of the upper feeding channel 47 corresponds to the lower feeding channel 48 The upper end opening of the lower feed channel 48 corresponds to the feed hopper 26 provided on the upper screen frame 21 .

The lower end opening of the upper feed channel 47 is provided with a material leveling device, and the material leveling device includes a material leveling rotating shaft 471, a material leveling cam 472, an adjusting arm 473, an adjusting plate 474, an adjusting screw rod 475 and an adjusting shaft 476. The leveling shaft 471 is mounted on the feed housing 41, and is relatively rotationally connected with the feed housing 41. The outside of the feed housing 41 is provided with a leveling motor, and the leveling motor drives the leveling shaft 471 to rotate. , the leveling shaft 471 is provided with a leveling cam 472, the leveling cam 472 is in contact with the bottom surface of the upper level leveling plate, the leveling shaft 471 is clamped with an adjustment arm 473, and the leveling shaft 471 is opposite Adjusting arm 473 rotates, and described adjusting arm 473 is provided with adjusting plate 474, and adjusting plate 474 corresponds to the lower end opening of upper feeding channel 47, and described adjusting plate 474 is hoisted on adjusting shaft 476 by adjusting screw rod 475.

The frame 1 is provided with an air inlet pipe 5, and the lower end nozzle of the air inlet pipe 5 communicates with the clean grain channel 241, and the upper end of the air inlet pipe 5 communicates with the exhaust passage arranged in the feed housing 41, and the described One side of the feed housing 41 is provided with an air outlet 6, and the upper wind deflector 7 and the lower wind deflector 8 are arranged inside the feed housing 41, and the gap between the upper wind deflector 7 and the top plate of the feed housing 41 is There is a gap between them, the gap between the upper wind guide plate 7 and the top plate of the feed housing 41, the gap between the upper layer uniform material plate 44 and the top plate of the feed housing 41, the gap between the upper layer guide plate 43 and the feed shell The gaps between the top plates of body 41 communicate with each other to form the upper air draft channel 9, there is a gap between the upper air deflector 7 and the lower air deflector 8, and the upper air deflector 7 and the lower air deflector 8 The gap between the lower material guide plate 45 and the upper layer uniform material plate 44 communicates with each other to form the lower exhaust air passage 10, the upper exhaust air passage 9 communicates with the air exhaust port 6 on the housing, and the lower exhaust air passage 10 communicates with the set on the frame 1 The air inlet pipe 5 , the reversing air channel 11 is formed between the lower baffle plate 46 and the upper material guide plate 43 in the feed housing 41 , and the lower air exhaust channel 10 communicates with the upper exhaust air channel 9 through the reversing air channel 11 . The lower air deflector 8 is provided with a lower V-shaped portion 81, the lower V-shaped portion 81 is connected to the lower material guide plate 45, the lower V-shaped portion 81 is provided with a lower dust auger 82, and the side of the feed housing 41 is provided There is a dust discharge passage, the lower V-shaped part 81 is connected to the dust discharge passage through the lower dust discharge auger 82, the upper V-shaped part 71 is provided on the upper wind deflector 7, and the upper V-shaped part 71 is provided with an upper dust discharge The auger 72 and the upper V-shaped portion 71 are connected to the dust discharge channel through the upper dust auger 72 .

The uniform batcher 23 distributes the material evenly into the upper sieve grid 251 of the four-layer screen grid group 25. The even batcher 23 includes a frame body 231, a dividing plate 232, a connecting block 233 and a locking device 234. The described The upper end of the frame body 231 is open, and the upper end opening of the frame body 231 is connected to the feed hopper 26. A plurality of partitions 232 are arranged in the frame body 231. The partition boards 232 divide the inner cavity of the frame body 231 into 12 feeding channels 236. The inner side of the frame body 231 is provided with 12 batching ports 235, the batching ports 235 are connected to the upper opening of the frame body 231 through the feeding channel 236, and an inclined feeding plate is arranged in the described batching port 235, and the feeding plate is closed. Blanking passage 236, described 12 batching openings 235 correspond to the upper sieve grid 251 of different sieve grid group 25 respectively, in the present embodiment: 1# feeding passage 236, 5# feeding passage 236, 9# feeding The channels 236 are respectively connected to the upper sieve grid 251 of the lower sieve grid group 25 through the corresponding batching ports 235; The upper sieve grid 251 of the sieve grid group 25; 3# unloading passage 236, 7# unloading passage 236, and 11# unloading passage 236 communicate with the upper sieve grid 251 of the bottom sieve grid group 25 through the corresponding batching port 235 respectively; 4 #Unloading passage 236, 8# unloading passage 236, and 12# unloading passage 236 communicate with the upper sieve grid 251 of the upper sieve grid group 25 through the corresponding batching port 235 respectively. The lower part of the frame body 231 is provided with a connecting block 233, and the frame body 231 is hinged to the lower part of the lower screen frame 22 through the connecting block 233, and the upper part of the frame body 231 is locked with the upper layer of the screen frame 21 by a locking device 234.

When in use, start the power transmission system 3, the power transmission system 3 drives the sieve body 2 to make a plane rotary motion, start the leveling motor, the leveling motor drives the leveling shaft 471 to rotate, and the upper level leveling plate 44 under the action of the leveling cam 472 Constantly swinging up and down. The air exhaust port 6 of the present invention is communicated with the exhaust fan.

The grain material enters from the feed port 42, enters the uniform batcher 23 through the upper feed channel 47, the lower feed channel 48, and the feed hopper 26, and then enters the upper sieve grid group 25 and the middle sieve grid along the 12 lower material channels 236. Group 25, the lower sieve grid group 25 and the bottom sieve grid group 25. Under the action of the power transmission system 3, the sieve body 2 performs plane rotary motion, and the grain materials entering the four-layer sieve grid group 25 are respectively screened by the four-layer sieve grid group. 25 Simultaneous screening, the grain material first enters the upper sieve grid 251, and after being screened by the upper sieve grid 251, the clean grain, small impurities and dust and other light and fine impurities fall from the sieve hole of the upper sieve grid 251 into the lower sieve grid 252 On the top, the impurities with larger particles enter the large miscellaneous channel 241 along the upper sieve grid 251 and are discharged, and the clean grain and impurities entering the lower sieve grid 252 are screened by the lower sieve grid 252, and the clean grain flows out from the clean grain channel 241, and the small impurities fall into the On the bottom plate 253, enter the small miscellaneous channel along the bottom plate 253 to discharge.

The clean grain channel 241 communicates with the air inlet pipe 5. Under the action of the exhaust fan, light and fine impurities such as dust in the clean grain are sucked away and flow upward along the air inlet pipe 5. 82, the space increases, the air pressure becomes smaller, the flow velocity slows down, the dust and other light and fine impurities in the air flow settle, and are discharged by the lower dust exhaust auger 83, and the air flow continues to flow, passing through the upper feed channel 47 and the lower feed When the grain material is between the channels 48, the airflow takes away part of the dust and light impurities in the grain material, then passes through the reversing air duct 11, and then passes through the grain material between the upper feed channel 47 and the feed port 42, Take away part of the dust and slight impurities in the grain materials again. When the airflow enters the upper V-shaped part 72, the space increases, the pressure of the airflow becomes smaller, and the flow speed slows down. The dust and other light impurities in the airflow settle and are discharged by the upper layer. The auger 73 is discharged.

It should be noted that the above-mentioned embodiments are illustrations rather than limitations to the technical solutions of the present invention, equivalent replacements by those of ordinary skill in the art or other modifications made according to the prior art, as long as they do not exceed the thinking and scope of the technical solutions of the present invention , should be included within the scope of the claims of the present invention.

Claims (4)

1. A rotary combined multi-layer screen, characterized in that it includes a frame (1), a screen body (2) suspended on the frame (1), a feed system fixed on the top of the frame (1) ( 4), and the power transmission system (3) that drives the sieve body (2) to perform plane rotary motion, the sieve body (2) includes an upper screen frame (21), a lower screen frame (22), a uniform batching device (23 ), the discharge channel (24) and the power transmission system (3), the upper screen frame (21) and the upper screen frame (21) are provided with a multi-layer screen grid group (25), the screen grid group ( 25) Including the upper sieve grid (251), lower sieve grid (252) and bottom plate (253) arranged in sequence from top to bottom, the pores of the lower sieve grid (252) are smaller than the pores of the upper sieve grid (251), and the upper sieve frame A power transmission system (3) is set between (21) and the lower screen frame (22), and the power transmission system (3) drives the upper screen frame (21) and the lower screen frame (22) to perform plane rotary motion, and the upper screen One side of the frame (21) and the lower screen frame (22) is provided with a discharge channel (24), and the other side of the upper screen frame (21) and the lower screen frame (22) is provided with a uniform batcher (23). The upper sieve frame (21) is provided with a feed hopper (26), the feed hopper (26) is connected to the feed system (4) and the uniform batcher (23), and the uniform batcher (23) evenly distributes the material The upper sieve grid (251) of the multi-layer sieve grid group (25) is distributed and sent, and the discharge channel (24) includes a large miscellaneous channel, a small miscellaneous channel and a clean grain channel (241), and the large miscellaneous channel The upper sieve grid (251) of all sieve grid groups (25) is connected, the small miscellaneous channel is connected with the bottom plate (253) of all sieve grid groups (25), and the clean grain channel (241) is connected with the lower sieve of all sieve grid groups (25) grid (252), the feeding system (4) includes a feeding housing (41) fixed on the top of the frame (1), the feeding housing (41) is provided with a feeding port (42), and the feeding The upper material guide plate (43), the upper layer uniform material plate (44), the lower layer material guide plate (45) and the lower layer baffle plate (46) are arranged in the material housing (41), and the upper layer uniform material plate (44) Hinged on the feed housing (41), the two ends of the upper layer guide plate (43) are fixed with the feed housing (41), and the upper layer uniform plate (44) and the upper layer guide plate (43) form a cross-sectional shape as a funnel Shaped upper feed channel (47), upper layer guide plate (43) and upper layer uniform material plate (44) and the top plate of the feed housing (41) are provided with gaps, the lower layer guide plate (45 ) and the lower baffle (46) are fixed to the feed housing (41), the lower material guide (45) and the lower baffle (46) form a funnel-shaped lower feed channel (48), the lower material guide There is a gap between the plate (45) and the upper layer uniform plate (44), there is a gap between the lower baffle (46) and the upper material guide plate (43), and the upper end of the upper feed channel (47) The opening corresponds to the feed port (42), the lower opening of the upper feeding channel (47) corresponds to the upper opening of the lower feeding channel (48), and the lower opening of the lower feeding channel (48) corresponds to the upper screen frame (21 ) on the feed hopper (26), the lower opening of the upper feed channel (47) is provided with a leveling device, the leveling device includes a leveling shaft (471), a leveling cam (472 ), adjusting arm (473), adjusting plate (474), adjusting screw (475) and adjusting shaft (476), and the uniform material rotating shaft (471) is worn on the feeding housing (41), and is connected with the feeding The material housing (41) is relatively rotationally connected, and the material feeding housing (41) is provided with a material leveling motor, which drives the material leveling shaft (471) to rotate, and the material leveling shaft (471) is provided with There is a leveling cam (472), and the leveling cam (472) is in contact with the bottom surface of the upper level leveling plate, and the leveling shaft (471) is clamped with an adjustment arm (473), and the leveling shaft (471) is opposite The adjustment arm (473) rotates, and the adjustment arm (473) is provided with an adjustment plate (474). The adjustment plate (474) corresponds to the lower opening of the upper feed channel (47), and the adjustment plate (474) passes through The adjusting screw (475) is hoisted on the adjusting shaft (476), the frame (1) is provided with an air inlet pipe (5), and the lower end of the air inlet pipe (5) is connected to the clean grain passage (241), The upper end of the air inlet pipe (5) communicates with the air suction passage provided in the feed housing (41), and an air suction port (6) is provided on one side of the feed housing (41). The upper air deflector (7)) and the lower air deflector (8) are arranged inside the feed housing (41), and there is a gap between the upper air deflector (7) and the top plate of the feed housing (41), the The gap between the upper air deflector (7) and the top plate of the feed housing (41), the gap between the upper uniform material plate (44) and the top plate of the feed housing (41), the upper material guide plate (43) The gap between the top plate of the feed housing (41) communicates with each other to form the upper air draft channel (9), and there is a gap between the upper air deflector (7) and the lower air deflector (8), and the upper air deflector (8) The gap between the air guide plate (7) and the lower air guide plate (8), and the gap between the lower material guide plate (45) and the upper layer uniform plate (44) are connected to each other to form the lower exhaust channel (10), and the upper exhaust The channel (9) communicates with the air inlet (6) on the shell, the lower air intake channel (10) communicates with the air inlet pipe (5) provided on the frame (1), and the lower layer in the feed housing (41) A reversing air channel (11) is formed between the baffle plate (46) and the upper material guide plate (43), and the lower air exhaust channel (10) is connected to the upper layer air exhaust channel (9) through the reversing air channel (11). 2. The rotary combined multi-layer screen according to claim 1, characterized in that: said lower air guide plate (8) is provided with a lower V-shaped part (81), and the lower V-shaped part (81) and the lower guide The material plate (45) is connected, the lower layer of the V-shaped part (81) is provided with a lower layer of dust discharge auger (82), the side of the feed shell (41) is provided with a dust discharge channel, and the lower layer of the V-shaped part (81) passes through the lower layer The dust discharge auger (82) is connected with the dust discharge channel. 3. The rotary combined multi-layer sieve according to claim 1, characterized in that: the upper air deflector (7) is provided with an upper V-shaped portion (71), and the upper V-shaped portion (71) An upper dust discharge auger (72) is arranged inside, and the upper V-shaped part (71) is connected to the dust discharge passage through the upper dust discharge auger (72). 4. The rotary combined multi-layer screen according to claim 1, characterized in that: the uniform batcher (23) includes a frame (231), a partition (232), a connecting block (233) and a locking device (234), the upper end of the frame body (231) is open, and the upper end opening of the frame body (231) is connected to the feed hopper (26), and a plurality of partitions (232) are arranged in the frame body (231), and the partition ( 232) Divide the inner cavity of the frame body (231) into multiple vertical feeding channels (236), and the inner side of the frame body (231) is provided with a plurality of batching ports (235), and the batching ports (235 ) is connected to the upper opening of the frame body (231) through the feeding channel (236), and an inclined feeding plate is arranged in the batching port (235), and the feeding plate closes the feeding channel (236), and the multiple The batching ports (235) correspond to the upper sieve grids (251) of different sieve grid groups (25), and the lower part of the frame body (231) is provided with a connecting block (233), and the frame body (231) passes through the connecting block ( 233)) is hinged at the lower part of the lower screen frame (22), and the upper part of the frame body (231) is locked with the upper part of the upper screen frame (21) by the locking device (234).

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