A maize threshing and screening device

Abstract

The present application provides a kind of corn threshing screening device, it is related to corn threshing screening technical field, including: screening plate is obliquely arranged in the discharge port below corn thresher, screening plate is provided with through slot in the surface of being penetrated up and down, the inner diameter of through slot is less than the outer diameter of corn cob;First conveying mechanism is arranged below screening plate, and first conveying mechanism is used to convey corn kernel to screening mechanism.Collecting cylinder is linked with the lower end of screening plate, for collecting corn cob.Corn is separated into corn kernel and corn cob by corn thresher and discharged to screening plate by discharge port, due to the inclination of screening plate, corn kernel and corn cob will slide down, in the process, corn kernel falls into first conveying mechanism along through slot, corn cob continues to slide along screening plate until falling into collecting cylinder, realizes the effect of automatic separation of corn kernel and corn cob.Corn kernel is further removed by screening mechanism Moldy corn kernel, so as to realize the effect of automatic screening of corn kernel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of corn threshing and screening, and particularly relates to a corn threshing and screening device. BACKGROUND

[0002] Corn threshing is generally completed by a corn thresher, and corn kernels and corn cobs are discharged from the corn thresher after threshing. In subsequent processing procedures, the corn kernels need to be separated from the corn cobs, impurities in the corn kernels need to be removed, moldy and immature kernels in the corn kernels need to be screened out, and finally the corn needs to be classified and stored according to the size of the kernels.

[0003] The above processing procedures are generally manually operated or processed by different devices respectively, and the overall efficiency is not high. In addition, for moldy and immature kernels in the corn kernels, the prior art is difficult to separate them from normal corn kernels.

[0004] Therefore, how to provide a device capable of automatically screening corn kernels is a problem to be solved by those skilled in the art. SUMMARY

[0005] The present application aims to provide a corn threshing and screening device to solve the problems in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides a corn threshing and screening device, comprising:

[0007] A corn thresher is used to separate corn into corn cobs and corn kernels.

[0008] A screening plate is obliquely arranged below a discharge port of the corn thresher, and a through slot is arranged through the upper and lower surfaces of the screening plate, and the inner diameter of the through slot is smaller than the outer diameter of the corn cobs.

[0009] A first conveying mechanism is arranged below the screening plate, and the corn kernels can fall into the first conveying mechanism from the through slot, and the first conveying mechanism is used to convey the corn kernels to a screening mechanism, and the screening mechanism is used to screen out moldy and immature kernels in the corn kernels.

[0010] A collecting cylinder is connected to a lower end of the screening plate and used to collect the corn cobs.

[0011] The present application has the following technical effects:

[0012] Corn is separated into kernels and cobs by a corn thresher and discharged from the discharge port onto a screening plate. Due to the tilt of the screening plate, the kernels and cobs slide downwards. During this process, the kernels fall along the trough into the first conveying mechanism, while the cobs continue to slide along the screening plate until they fall into the collection cylinder, achieving automatic separation of kernels and cobs. The kernels are further screened by a screening mechanism to remove moldy or diseased kernels, thus achieving automatic screening of the corn kernels.

[0013] In addition, the width of the trough can be adjusted so that large particles such as stones cannot pass through the trough, thus achieving the effect of simultaneous screening and removal of corn cobs and large particles.

[0014] Furthermore, the through groove includes a first through groove and a second through groove. One end of the first through groove is located at the lower end of the screening plate and near the left side of the screening plate. One end of the second through groove is located at the lower end of the screening plate and near the right side of the screening plate. The other ends of the first through groove and the second through groove are connected and located at the higher end of the screening plate.

[0015] The beneficial effects of adopting the above technical solution are:

[0016] Due to the influence of the through-channel structure, as the corn kernels slide down the screening plate, the corn kernels located at different positions (in the width direction of the screening plate) will fall at different positions (in the length direction of the screening plate). This avoids the corn kernels from concentrating in the middle of the first conveying mechanism, allowing the corn kernels to be evenly conveyed to the screening mechanism, expanding the actual usable area of ​​the screening mechanism, and improving work efficiency.

[0017] Furthermore, the first conveying mechanism conveys corn kernels in a direction away from the collecting cylinder.

[0018] Furthermore, the screening mechanism includes:

[0019] The second conveying mechanism corresponds to the tail end of the first conveying mechanism. The second conveying mechanism has a conveyor belt with multiple ventilation holes extending through the upper and lower surfaces.

[0020] An air supply mechanism, located below the second conveying mechanism, is used to blow air onto the conveyor belt from bottom to top and separate moldy corn kernels from the conveyor belt;

[0021] A collection mechanism, located above the second conveying mechanism, is used to collect moldy corn kernels.

[0022] The beneficial effects of adopting the above technical solution are:

[0023] Compared to normal corn kernels, moldy corn kernels have a different specific gravity, meaning their relative density in air is different. Based on this characteristic, this application utilizes a blowing method to lift the moldy corn kernels upwards and separate them from the conveyor belt, thus removing the moldy kernels. Simultaneously, hollow kernels, lightweight impurities, and loose skin in the corn kernels can also be removed.

[0024] Furthermore, the second conveying mechanism is a vibrating conveyor belt.

[0025] The beneficial effects of adopting the above technical solution are:

[0026] Unlike ordinary conveyor belts, vibrating conveyor belts can cause corn kernels to periodically traverse parabolic paths during the conveying direction. In other words, corn kernels can be periodically thrown into the air during the conveying process, increasing the gaps between the kernels. Combined with the air supply mechanism below the vibrating conveyor belt, it can quickly and efficiently blow moldy corn kernels upwards, separating them from normal corn kernels.

[0027] Furthermore, the collection mechanism includes:

[0028] An air collecting hood is disposed above the second conveying mechanism and has an induced draft fan;

[0029] A collection bag is connected to the air collecting hood via a ventilation pipe; the collection bag is used to collect moldy corn kernels.

[0030] The beneficial effects of adopting the above technical solution are:

[0031] When the moldy corn kernels are blown upwards by the blower, the blower adsorbs the moldy corn kernels and collects them into a collection bag through the air collection hood and ventilation pipe, while the air is discharged through the pores of the bag, thus collecting the moldy corn kernels.

[0032] Furthermore, the screening mechanism also includes:

[0033] The box body has an upper opening;

[0034] A multi-layer elastic screen with elastic mesh is arranged at intervals in the box body in order of increasing elastic mesh size from bottom to top. The uppermost elastic screen corresponds to the tail end of the second conveying mechanism. The size of the elastic mesh is smaller than the size of the corn kernel.

[0035] A longitudinal vibrator is located at the bottom of the housing. The longitudinal vibrator is used to vibrate the multiple layers of elastic screens and trap moldy corn kernels on the uppermost elastic screen.

[0036] The beneficial effects of adopting the above technical solution are:

[0037] Based on the differences in density and gravity between normal and moldy corn kernels, a longitudinal vibrator is used to cause them to vibrate and jump longitudinally on the upper surface of an elastic screen. The mesh size of the elastic screen is slightly smaller than that of the corn kernels. During vibration, the normal corn kernels, with their higher density and weight, allow the mesh to expand, causing them to fall into the lower elastic screen. The moldy corn kernels, with their lower density and weight, cannot overcome the elasticity of the mesh during longitudinal vibration and thus cannot pass through the screen. Through the action of multiple layers of elastic screens, moldy corn kernels are trapped in the upper elastic screens, while normal corn kernels fall into the lower elastic screens, effectively removing the moldy corn kernels.

[0038] Furthermore, it also includes:

[0039] The machine body; the screening plate, collecting cylinder, first conveying mechanism, second conveying mechanism, air supply mechanism, and box are all installed inside the machine body, the air collecting hood is installed on the top of the machine body, the corn thresher is installed on the machine body and its discharge port extends into the machine body, the collecting cloth bag is installed on the machine body, and the machine body has an air inlet corresponding to the air supply mechanism.

[0040] The flexible connecting part has multiple discharge ports on the machine body corresponding to the multi-layer elastic screen. One end of the flexible connecting part is connected to the discharge port, and the other end is connected to the elastic screen.

[0041] A rotating mechanism is connected to the housing and can rotate the housing to a position where the elastic screen is tilted. When the elastic screen is tilted, its lower end corresponds to the flexible connecting part.

[0042] Furthermore, the rotating mechanism includes:

[0043] The cylinder has its bottom hinged to a first hinge seat, which is fixed to the bottom surface of the machine body. The output end of the cylinder is hinged to a second hinge seat, which is fixed to the bottom surface of the box at the end away from the discharge port.

[0044] The support rod has its lower end fixed to the bottom surface of the machine body and its upper end hinged to the third hinge seat, which is fixed to the bottom surface of the box near the discharge port.

[0045] The beneficial effects of adopting the above technical solution are:

[0046] After the moldy corn kernels are screened out, the normal corn kernels and the moldy corn kernels need to be collected separately. This application uses a flexible connecting part to connect the discharge port and the elastic screen. The cylinder drives the whole box to rotate, and rotates the elastic screen to an inclined position. The normal corn kernels and the moldy corn kernels slide along the elastic screen to the discharge port by their own gravity and can be discharged through their respective discharge ports.

[0047] Furthermore, it also includes: a corn grading mechanism with multiple grading screens, wherein the multiple grading screens are arranged at intervals in order of increasing mesh size from bottom to top, and the uppermost grading screen corresponds to the lower discharge port.

[0048] The beneficial effects of adopting the above technical solution are:

[0049] After corn cobs, impurities, and moldy or diseased corn kernels are removed by screening, the corn kernels are passed through multiple layers of grading screens to complete the grading of different sizes. Once grading is complete, the kernels are collected and stored. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the structure of the present invention;

[0052] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0053] Figure 3 This is a schematic diagram of the screening plate structure;

[0054] Figure 4 This is a schematic diagram of the base plate structure;

[0055] The components include: 1. Corn thresher; 101. Feed inlet; 102. Discharge outlet; 2. Screening plate; 201. Side plate; 202. Bottom plate; 3. First conveying mechanism; 4. Collection cylinder; 5. First through trough; 6. Second through trough; 7. Second conveying mechanism; 8. Air collection hood; 9. Collection bag; 10. Box body; 11. Elastic screen; 12. Longitudinal vibrator; 13. Machine body; 1301. Air inlet; 1302. Discharge outlet; 14. Cylinder; 15. First hinge seat; 16. Second hinge seat; 17. Third hinge seat; 18. Support rod. Detailed Implementation

[0056] The following is the existing technology regarding corn threshing and screening devices.

[0057] Patent CN112219565B discloses a corn threshing and screening device, which consists of several main parts: a main body, a threshing mechanism, an opening and closing mechanism, a screening mechanism, a conveying mechanism, and a power mechanism. The following is a detailed description of the device:

[0058] Main structure

[0059] The main body forms the frame of the device, upon which all other components are mounted. A threshing mechanism is located at the top of the main body for automatic corn threshing. An opening and closing mechanism is also located at the top of the main body for easy internal maintenance. A screening mechanism is located at the bottom of the opening and closing mechanism for screening corn kernels of different sizes. A conveying mechanism is located to one side of the screening mechanism and is responsible for transporting the corn kernels to the top of the screening mechanism. A power mechanism is installed on the side wall inside the main body, providing power to the threshing and conveying mechanisms.

[0060] threshing mechanism

[0061] The threshing mechanism includes a feed hopper, a threshing hull, a drum, hanging pins, a first pulley, a filter screen, and a slag outlet. Corn cobs enter the threshing hull through the feed hopper. The hanging pins on the drum strike and scrape the corn cobs, separating the kernels. The kernels fall through the filter screen onto the conveying mechanism, while larger corn cobs are discharged through the slag outlet.

[0062] Conveying mechanism

[0063] The conveying mechanism consists of a first rotating shaft, spiral blades, and a conveying pipe. The spiral blades, wound around the first rotating shaft and located inside the conveying pipe, transport the corn kernels from the bottom to a higher position for screening.

[0064] Power mechanism

[0065] The power mechanism includes a connecting belt, a second motor, a second pulley, a first gear, a second gear, a second shaft, a third gear, and a fourth gear. The second motor provides power to the threshing and conveying mechanisms via the pulley and gear system.

[0066] Opening and closing mechanism

[0067] The opening and closing mechanism includes a sealing cover, a handle, a first telescopic rod, a second telescopic rod, a limiting hole, a limiting wheel, a limiting groove, a first limiting rod, a second limiting rod, a first spring, and a third limiting rod. The opening and closing angle of the sealing cover can be adjusted by the handle, facilitating internal maintenance of the main body.

[0068] Screening agency

[0069] The screening mechanism includes a discharge hopper, a screen, a second spring, a discharge plate, a connecting column, a first motor, a cam, a slider, a sliding column, a third spring, and a fixing frame. The screen is tilted, and the screening and separation of corn kernels is achieved through the vibration of the first motor. Larger corn kernels cannot pass through the screen and slide down through the discharge hopper; corn kernels that can pass through the screen fall to the top of the discharge plate and slide out through another discharge hopper.

[0070] Operation of the device

[0071] When threshing is required, the motor of the power mechanism is started, and the first pulley rotates, driving the rollers and hangers to thresh the corn cobs. The corn kernels fall through the filter screen into the conveyor pipe, where they are transported by spiral blades to the top of the screening mechanism. The screening mechanism separates the corn kernels by size through the vibration of the first motor. The opening and closing mechanism allows the operator to easily inspect the internal structure and simplifies troubleshooting procedures.

[0072] Advantages of the device

[0073] The advantages of this corn threshing and screening device are:

[0074] It improves threshing efficiency and avoids the labor intensity of manual threshing.

[0075] The internal troubleshooting steps have been simplified, and the opening and closing mechanism facilitates maintenance.

[0076] By screening corn kernels of different sizes, the economic value of corn is increased.

[0077] The power unit provides power to both the threshing and conveying mechanisms, reducing redundant power settings and improving space utilization.

[0078] The device was designed with multiple objectives in mind, including ease of operation, simplicity of maintenance, and improved corn processing efficiency and economic value. Through automated operation, it can significantly enhance agricultural production efficiency and reduce costs.

[0079] In this device, after corn is threshed, the corn cobs remain inside the threshing structure. Although this achieves automatic separation of corn kernels and cobs, the cobs need to be discharged from the slag outlet. This can lead to corn kernels being discharged along with the cobs, and there is also the problem of the cobs not being discharged in a timely manner, which can affect the normal operation of the threshing structure. In addition, while this device can screen corn of different sizes, it cannot remove moldy or diseased corn kernels.

[0080] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0081] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0082] This invention provides a corn threshing and screening device, comprising: a corn thresher 1, used to separate corn into corn cobs and corn kernels. Specifically, the corn thresher 1 includes a feeding port 101, a discharging port 102, and a rotary threshing assembly. The feeding port 101 is located at the top of the corn thresher 1, the discharging port 102 is located at the bottom of the corn thresher 1, and the rotary threshing assembly is located in the cavity of the corn thresher 1. The rotary threshing assembly adopts an existing structure and is capable of separating corn kernels from corn cobs. It should be noted that this embodiment is used for dried corn.

[0083] Screening plate 2 is inclinedly positioned below the discharge port 102 of corn thresher 1. Screening plate 2 includes side plates 201 and a bottom plate 202. The side plates 201 are located on the left and right sides of the bottom plate 202 to prevent corn kernels from overflowing from the bottom plate 202. The bottom plate 202 has a through groove extending through its upper and lower surfaces. The inner diameter of the through groove is smaller than the outer diameter of the corn cob but slightly larger than the size of the corn kernel, allowing corn kernels to pass through, but preventing large particles such as corn cobs and stones from passing through. A first conveying mechanism 3 (conveyor belt) is positioned below screening plate 2, allowing corn kernels to fall into the first conveying mechanism 3 from the through groove. The first conveying mechanism 3 is used to transport the corn kernels to the screening mechanism, which is used to remove moldy or diseased corn kernels. A collecting cylinder 4 is connected to the lower end of screening plate 2 and is located to the left of the first conveying mechanism 3, used to collect corn cobs. The first conveying mechanism 3 transports corn kernels away from the collecting cylinder 4 (to the right).

[0084] In this embodiment, the through groove includes a first through groove 5 and a second through groove 6, which are generally arranged in a V-shape. One end of the first through groove 5 is located at the lower end of the base plate 202 and near the left side of the base plate 202, and one end of the second through groove 6 is located at the lower end of the base plate 202 and near the right side of the base plate 202. The other end of the first through groove 5 and the other end of the second through groove 6 are connected and located at the higher end of the base plate 202 and in the middle of the base plate 202.

[0085] In this embodiment, the screening mechanism includes: a second conveying mechanism 7, corresponding to the tail end of the first conveying mechanism 3, the second conveying mechanism 7 having a conveyor belt, the conveyor belt having multiple ventilation holes through its upper and lower surfaces; an air supply mechanism disposed below the second conveying mechanism 7, used to blow air from bottom to top onto the conveyor belt and separate the moldy corn kernels from the conveyor belt; and a collection mechanism disposed above the second conveying mechanism 7, used to collect the moldy corn kernels.

[0086] In this embodiment, the second conveying mechanism 7 is a vibrating conveyor belt.

[0087] In this embodiment, the collection mechanism includes: a wind collection hood 8, which is disposed above the second conveying mechanism 7 and has a blower; a collection bag 9 is connected to the wind collection hood 8 through a ventilation pipe, and the collection bag 9 is used to collect moldy corn kernels.

[0088] In this embodiment, the screening mechanism further includes a housing 10 with an upper opening; multiple elastic screens 11 with elastic mesh, the multiple elastic screens 11 are arranged in the housing 10 at intervals in order of increasing elastic mesh size from bottom to top, the uppermost elastic screen 11 corresponds to the tail end of the second conveying mechanism 7, and the elastic mesh size is smaller than the size of the corn kernels; a longitudinal vibrator 12 is disposed at the bottom of the housing 10, the longitudinal vibrator 12 is used to vibrate the multiple elastic screens 11 and trap the moldy corn kernels on the uppermost elastic screen 11.

[0089] In this embodiment, the machine body 13 is also included. The screening plate 2, collecting cylinder 4, first conveying mechanism 3, second conveying mechanism 7, air supply mechanism, and housing 10 are all disposed within the machine body 13. An air collecting hood 8 is disposed on the top of the machine body 13. A corn thresher 1 is disposed on the machine body 13, with its discharge port 102 extending into the machine body 13. A collecting bag 9 is disposed on the machine body 13. The machine body 13 has an air inlet 1301 corresponding to the air supply mechanism. The machine body 13 has multiple discharge ports 1302 corresponding to the multi-layer elastic screen 11. One end of the flexible connecting part is connected to the discharge port 1302, and the other end is connected to the elastic screen 11. The machine body 13 has a flip-top corresponding to the collecting cylinder 4, which can be opened to remove the entire collecting cylinder 4 or to remove the corn cobs and impurities inside the collecting cylinder 4. A rotating mechanism is connected to the housing 10, enabling the housing 10 to be rotated to an inclined position of the elastic screen 11. When the elastic screen 11 is inclined, its lower end corresponds to the flexible connecting part. The flexible connection can meet the rotation requirements of the box 10. When the box 10 rotates, it can be stretched to maintain the connection with the elastic screen 11.

[0090] In this embodiment, the rotating mechanism includes: a cylinder 14, the bottom of which is hinged to a first hinge seat 15, the first hinge seat 15 being fixed to the bottom surface of the machine body 13; the output end of the cylinder 14 being hinged to a second hinge seat 16, the second hinge seat 16 being fixed to the bottom surface of the housing 10 away from the discharge port 1302; and a support rod 18, the lower end of which is fixed to the bottom surface of the machine body 13, the upper end of which is hinged to a third hinge seat 17, the third hinge seat 17 being fixed to the bottom surface of the housing 10 near the discharge port 1302.

[0091] In this embodiment, a corn grading mechanism is also included, which has multiple grading screens. The multiple grading screens are arranged at intervals in order of increasing mesh size from bottom to top, and the uppermost grading screen corresponds to the lower discharge port 1302.

[0092] The specific work process is as follows:

[0093] S1: The dried corn is fed into the corn thresher 1 through the feed port 101. The corn kernels are separated from the corn cobs by the threshing assembly. The corn kernels and corn cobs are discharged onto the screening plate 2 through the discharge port 102.

[0094] S2: Corn cobs and kernels move downwards along the screening plate 2 under their own gravity. During this process, the kernels near the middle of the screening plate 2 first reach the junction of the first channel 5 and the second channel 6 and fall onto the first conveying mechanism 3 below. The kernels on both sides of the middle of the screening plate 2 continue to move downwards and gradually fall from the first channel 5 and the second channel 6 onto the first conveying mechanism 3. Large particles of impurities mixed in with the kernels, such as stones, continue to move downwards with the corn cobs and eventually fall into the collection cylinder 4.

[0095] S3: Corn kernels move along the first conveyor mechanism 3 and fall into the second conveyor mechanism 7. The second conveyor mechanism 7 uses a vibrating conveyor belt. Under the action of the vibrating conveyor belt, the corn kernels undergo periodic parabolic motion in the direction of right. During this process, the air supply mechanism below the second conveyor mechanism 7 continuously blows air upward. Since the specific gravity of normal corn kernels and moldy corn kernels in the air is different, the moldy corn kernels and light impurities mixed with the normal corn kernels can be blown upward by the air and separated from the second conveyor mechanism 7. The blower in the air collecting hood 8 adsorbs the moldy corn kernels and light impurities upward and sends them into the collecting bag 9 through the air collecting hood 8 and the ventilation pipe. The air is discharged through the gaps in the collecting bag 9.

[0096] S4: Corn kernels move along the second conveying mechanism 7 and fall into the uppermost elastic screen 11. The longitudinal vibrator 12 generates longitudinal vibration on the housing 10, causing all the elastic screens 11 and the corn kernels on them to vibrate together, resulting in longitudinal jumping of the corn kernels. Because normal corn kernels and moldy corn kernels have different densities and weights, normal corn kernels can overcome the elasticity of the mesh and pass through the upper elastic screen 11, falling sequentially into the lower elastic screen 11. Moldy corn kernels, however, cannot overcome the elasticity of the elastic screen 11 and are trapped in the upper elastic screen 11. Through the combined action of multiple layers of elastic screens 11 and the longitudinal vibrator 12, all the moldy corn kernels remaining in the normal corn kernels are screened out.

[0097] S5: Start cylinder 14, the box 10 rotates clockwise, at this time all the elastic screens 11 are in an inclined state, the corn kernels on the elastic screens 11 slide down by their own gravity and are discharged from their respective discharge ports 1302, and normal corn kernels and moldy corn kernels are collected into different containers respectively.

[0098] S6: Pass normal corn kernels through multiple grading screens in sequence. The corn kernels will be trapped on the corresponding grading screens according to their own size, thus completing the grading of corn kernels of different sizes. The graded corn kernels can then be collected and stored.

[0099] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0100] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A corn threshing and screening device, characterized in that, include: A corn thresher (1) is used to separate corn into corn cobs and corn kernels; Screening plate (2) is inclinedly set below the discharge port (102) of corn thresher (1). The screening plate (2) has a through groove through its upper and lower surfaces. The inner diameter of the through groove is smaller than the outer diameter of the corn cob. The first conveying mechanism (3) is located below the screening plate (2). Corn kernels can fall into the first conveying mechanism (3) from the trough. The first conveying mechanism (3) is used to convey the corn kernels to the screening mechanism, which is used to screen out moldy corn kernels. The collecting cylinder (4) is connected to the lower end of the screening plate (2) and is used to collect corn cobs; The channel includes a first channel (5) and a second channel (6). One end of the first channel (5) is located at the lower end of the screening plate (2) and close to the left side of the screening plate (2). One end of the second channel (6) is located at the lower end of the screening plate (2) and close to the right side of the screening plate (2). The other end of the first channel (5) is connected to the other end of the second channel (6) and located at the higher end of the screening plate (2). The first conveying mechanism (3) conveys corn kernels in a direction away from the collecting cylinder (4). The screening organization includes: The second conveying mechanism (7) corresponds to the tail end of the first conveying mechanism (3). The second conveying mechanism (7) has a conveyor belt with multiple ventilation holes running through the upper and lower surfaces. An air supply mechanism is located below the second conveying mechanism (7) and is used to blow air onto the conveyor belt from bottom to top and separate moldy corn kernels from the conveyor belt. A collection mechanism, located above the second conveying mechanism (7), is used to collect moldy corn kernels; The box (10) has an upper opening; The multi-layer elastic screen (11) has elastic mesh. The multiple layers of the elastic screen (11) are arranged in the box (10) in the order of increasing elastic mesh size from bottom to top. The uppermost elastic screen (11) corresponds to the tail end of the second conveying mechanism (7). The size of the elastic mesh is smaller than the size of the corn kernel. A longitudinal vibrator (12) is set at the bottom of the box (10). The longitudinal vibrator (12) is used to vibrate the multiple layers of elastic screen (11) and trap the moldy corn kernels on the upper elastic screen (11).

2. The corn threshing and screening device according to claim 1, characterized in that, The second conveying mechanism (7) is a vibrating conveyor belt.

3. The corn threshing and screening device according to claim 2, characterized in that, The collection mechanism includes: An air collecting hood (8) is disposed above the second conveying mechanism (7) and has an induced draft fan; A collection bag (9) is connected to the air collecting hood (8) through a ventilation pipe. The collection bag (9) is used to collect moldy corn kernels.

4. The corn threshing and screening device according to claim 3, characterized in that, Also includes: The machine body (13) is equipped with the screening plate (2), the collection cylinder (4), the first conveying mechanism (3), the second conveying mechanism (7), the air supply mechanism, and the box (10). The air collection hood (8) is located on the top of the machine body (13). The corn thresher (1) is located on the machine body (13) with its discharge port (102) extending into the machine body (13). The collection bag (9) is located on the machine body (13). The machine body (13) has an air inlet (1301) corresponding to the air supply mechanism. The flexible connection part has multiple discharge ports (1302) corresponding to the multi-layer elastic screen (11) of the machine body (13). One end of the flexible connection part is connected to the discharge port (1302) and the other end is connected to the elastic screen (11). A rotating mechanism is connected to the housing (10) and can rotate the housing (10) to the position where the elastic screen (11) is tilted. When the elastic screen (11) is tilted, its lower end corresponds to the flexible connecting part.

5. A corn threshing and screening device according to claim 4, characterized in that, The rotating mechanism includes: The cylinder (14) is hinged at its bottom to the first hinge seat (15), which is fixed to the bottom surface of the machine body (13). The output end of the cylinder (14) is hinged to the second hinge seat (16), which is fixed to the bottom surface of the box body (10) away from the discharge port (1302). The support rod (18) has its lower end fixed to the bottom surface of the machine body (13) and its upper end hinged to the third hinge seat (17), which is fixed to the bottom surface of the box body (10) near the discharge port (1302).

6. The corn threshing and screening device according to claim 4, characterized in that, Also includes: The corn grading mechanism has multiple grading screens, which are arranged at intervals in order of increasing mesh size from bottom to top. The uppermost grading screen corresponds to the lower discharge port (1302).

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