Corn threshing and screening device

Abstract

The invention provides a corn threshing and screening device, and relates to the technical field of corn threshing and screening, the corn threshing and screening device is characterized in that a screening plate is obliquely arranged below a discharge port of a corn thresher, the screening plate penetrates through the upper and lower surfaces and is provided with a through groove, and the inner diameter of the through groove is smaller than the outer diameter of a corn cob; the first conveying mechanism is arranged below the screening plate and used for conveying the corn particles to the screening mechanism. The collecting cylinder is connected with the lower end of the screening plate and used for collecting corn cobs. Corn is separated into corn particles and corn cobs through the corn thresher, the corn particles and the corn cobs are discharged to the screening plate through the discharging opening, due to the fact that the screening plate inclines, the corn particles and the corn cobs can slide downwards, in the process, the corn particles fall into the first conveying mechanism along the through groove, and the corn cobs continue to slide along the screening plate till falling into the collecting barrel. And the effect of automatically separating the corn particles from the corn cobs is achieved. And the corn particles are further screened through the screening mechanism, so that the effect of automatically screening the corn particles is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of corn threshing and screening, in particular to a corn threshing and screening device. Background Art

[0002] Corn threshing is usually done by a corn thresher, and corn kernels and corn cobs are discharged from the corn thresher together. In the subsequent processing steps, it is necessary to separate corn kernels from corn cobs, remove impurities in corn kernels, screen out moldy and diseased kernels and immature kernels in corn kernels, and finally grade and store the corn according to kernel size.

[0003] The above processing steps are generally manually operated or processed separately by different equipment, and the overall efficiency is not high. In addition, it is difficult to separate moldy and diseased corn kernels from normal corn kernels in the prior art.

[0004] In view of this, how to provide a device that can automatically screen corn particles is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a corn threshing and screening device to solve the problems existing in the prior art.

[0006] To achieve the above object, the present invention provides a corn threshing and screening device, comprising:

[0007] Corn thresher, used to separate corn into cobs and kernels;

[0008] A screening plate is obliquely arranged below the discharge port of the corn thresher, wherein the screening plate is provided with through grooves through the upper and lower surfaces, and the inner diameter of the through groove is smaller than the outer diameter of the corn cob;

[0009] A first conveying mechanism is arranged below the screening plate, and corn particles can fall into the first conveying mechanism from the through slot, and the first conveying mechanism is used to convey the corn particles to the screening mechanism, and the screening mechanism is used to screen out moldy and diseased corn particles from the corn particles;

[0010] The collecting cylinder is connected with the lower end of the screening plate and is used for collecting corn cobs.

[0011] The present invention discloses the following technical effects:

[0012] Corn is separated into corn kernels and corn cobs by the corn thresher and discharged onto the screening plate from the discharge port. Since the screening plate is tilted, the corn kernels and corn cobs slide downward. During the process, the corn kernels fall into the first conveying mechanism along the through slot, and the corn cobs continue to slide along the screening plate until they fall into the collecting cylinder, thus achieving the effect of automatic separation of corn kernels and corn cobs. The corn kernels are further removed from moldy and diseased corn kernels by the screening mechanism, thus achieving the effect of automatic screening of corn kernels.

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

[0014] Furthermore, the through groove includes a first through groove and a second through groove, one end of the first through groove is arranged at the lower end of the screening plate and close to the left side of the screening plate, one end of the second through groove is arranged at the lower end of the screening plate and close to the right side of the screening plate, and the other end of the first through groove is connected to the other end of the second through groove and is arranged at the higher end of the screening plate.

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

[0016] Affected by the through-groove structure, when the corn particles slide downward along the screening plate, the corn particles 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 can avoid the corn particles from being concentrated in the middle of the first conveying mechanism, so that the corn particles can be evenly conveyed to the screening mechanism, thereby expanding the actual use area of ​​the screening mechanism and improving work efficiency.

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

[0018] Furthermore, the screening mechanism includes:

[0019] A second conveying mechanism, corresponding to the tail end of the first conveying mechanism, the second conveying mechanism has a conveying belt, and the conveying belt is provided with a plurality of ventilation holes on the upper and lower surfaces thereof;

[0020] An air supply mechanism is disposed below the second conveying mechanism and is used to blow air to the conveyor belt from bottom to top and separate the moldy and diseased corn particles from the conveyor belt;

[0021] The collecting mechanism is arranged above the second conveying mechanism and is used for collecting moldy and diseased corn particles.

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

[0023] Compared with normal corn particles, moldy corn particles have different specific gravity, that is, different relative density in the air. Based on this characteristic, the present application uses air blowing to blow the moldy corn particles upward and separate them from the conveyor belt, thereby screening out the moldy corn particles. At the same time, hollow particles, light impurities, and floating skins in the corn particles can also be screened out.

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

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

[0026] The vibrating conveyor belt is different from the ordinary conveyor belt. It can make the corn particles periodically generate parabolas in the conveying direction. That is to say, the corn particles can be periodically thrown into the air during the conveying process, so that the gaps between the corn particles are increased. Combined with the air supply mechanism under the vibrating conveyor belt, the moldy and diseased corn particles can be quickly and efficiently blown upwards to separate them from the normal corn particles.

[0027] Furthermore, the collection mechanism includes:

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

[0029] The collecting bag is connected with the wind collecting hood through a ventilation pipe, and the collecting bag is used to collect moldy and diseased corn particles.

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

[0031] When the moldy and diseased corn particles are blown upward by the blower mechanism, the induced draft fan adsorbs the moldy and diseased corn particles and collects them into the collection bag through the wind collecting hood and the ventilation pipe, while the air is discharged through the pores of the bag, thereby collecting the moldy and diseased corn particles.

[0032] Furthermore, the screening mechanism also includes:

[0033] A box body, wherein the box body has an upper opening;

[0034] A multi-layer elastic screen having elastic meshes, the multi-layer elastic screens are arranged in the box body in an order of increasing elastic meshes from bottom to top, the uppermost elastic screen corresponds to the tail end of the second conveying mechanism, and the size of the elastic meshes is smaller than the size of corn particles;

[0035] A longitudinal vibrator is arranged at the bottom of the box body, and is used to vibrate the multiple layers of the elastic screens and retain the moldy and diseased corn particles on the elastic screens arranged above.

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

[0037] Based on the different densities and gravity of normal corn kernels and moldy corn kernels, a longitudinal vibrator is used to make the two generate longitudinal vibration and jump on the upper surface of the elastic screen. The elastic mesh of the elastic screen is slightly smaller than the size of the corn kernels. During the vibration process, the density and weight of normal corn kernels are large, so the elastic mesh can expand and then fall into the elastic screen below; while the density and weight of moldy corn kernels are small, and it is difficult to overcome the elastic force of the elastic mesh during the longitudinal vibration process, and they cannot pass through the screen and fall below. After the action of multiple layers of elastic screens, the moldy corn kernels will be trapped in the upper elastic screen, and the normal corn kernels will fall into the lower elastic screen, realizing the screening of moldy corn kernels.

[0038] Furthermore, it also includes:

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

[0040] A flexible connection part, wherein the body is provided with a plurality of discharge ports corresponding to the multi-layer elastic screen, one end of the flexible connection 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 box body and can rotate the box body to a position where the elastic screen is tilted. When the elastic screen is tilted, its lower end corresponds to the flexible connecting portion.

[0042] Furthermore, the rotating mechanism comprises:

[0043] A cylinder, the bottom of which is hinged to a first hinge seat, the first hinge seat is fixed to the bottom surface of the machine body, the output end of the cylinder is hinged to a second hinge seat, the second hinge seat is fixed to an end of the bottom surface of the box body away from the discharge port;

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

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

[0046] After the moldy and diseased corn grains are screened out, the normal corn grains and the moldy and diseased corn grains need to be collected separately. The present application adopts a flexible connection part to connect the discharge port and the elastic screen, and drives the box body to rotate as a whole through the cylinder to rotate the elastic screen to an inclined position. The normal corn grains and the moldy corn grains use their own gravity to slide along the elastic screen toward the discharge port, and can be discharged through their respective corresponding discharge ports.

[0047] Furthermore, it also includes: a corn grading mechanism, which has multiple layers of grading screens, and the multiple layers of grading screens are arranged in the 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 the corn cobs, impurities and moldy corn kernels are screened out, the corn kernels are passed through multiple layers of grading screens in sequence to complete the grading of corn kernels of different sizes. After the grading is completed, they can be collected and stored. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

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

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

[0055] Among them, 1. corn thresher; 101. feeding port; 102. discharging port; 2. screening plate; 201. side plate; 202. bottom plate; 3. first conveying mechanism; 4. collecting cylinder; 5. first through slot; 6. second through slot; 7. second conveying mechanism; 8. wind collecting hood; 9. collecting bag; 10. box body; 11. elastic screen; 12. longitudinal vibrator; 13. machine body; 1301. air inlet; 1302. discharging port; 14. cylinder; 15. first articulated seat; 16. second articulated seat; 17. third articulated seat; 18. support rod. DETAILED DESCRIPTION

[0056] The following is the prior art about corn threshing and screening device

[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 introduction of the device:

[0058] Main structure

[0059] The main body is the frame of the device, on which all other parts are mounted. A threshing mechanism is located at the top of the main body, which is used to automatically thresh the corn. The opening and closing mechanism is located at the top of the main body, which is convenient for internal maintenance. The screening mechanism is located at the bottom of the opening and closing mechanism, which is used to screen corn kernels of different sizes. The conveying mechanism is located on one side of the screening mechanism and is responsible for conveying the corn kernels to the top of the screening mechanism. The power mechanism is installed on the side wall inside the main body to provide power for the threshing mechanism and the conveying mechanism.

[0060] Threshing mechanism

[0061] The threshing mechanism includes a feed hopper, a threshing husk, a roller, a hanging nail, a first pulley, a filter screen and a slag outlet. Corn cobs enter the threshing husk through the feed hopper, and the hanging nails on the roller knock and scrape the corn cobs to peel off the corn kernels. The corn kernels fall through the filter screen to the conveying mechanism, while the larger corn cob hammers are discharged through the slag outlet.

[0062] Conveying mechanism

[0063] The conveying mechanism consists of a first rotating shaft, a spiral blade and a conveying pipe. The first rotating shaft is wound with a spiral blade, which is located inside the conveying pipe and conveys corn kernels from the bottom to a high place for screening.

[0064] Power mechanism

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

[0066] Opening and closing mechanism

[0067] The opening and closing mechanism includes a sealing cover plate, a pull 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 plate can be adjusted by the pull handle, so that the inside of the main body can be easily inspected.

[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 slide column, a third spring and a fixed frame. The screen is tilted, and the corn kernels are screened and separated by the vibration of the first motor. Larger corn kernels cannot pass through the screen and slide 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, the first pulley rotates, and the drum and the nails are driven to thresh the corn cobs. The corn kernels fall through the filter screen to the conveying pipe and are transported to the top of the screening mechanism by the spiral blades. 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 inside of the main body, simplifying the troubleshooting steps.

[0072] Advantages of the device

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

[0074] The threshing efficiency is improved and the labor intensity of manual threshing is avoided.

[0075] The troubleshooting steps inside the main body are 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 mechanism provides power to the threshing and conveying mechanisms at the same time, reducing redundant power settings and improving space utilization.

[0078] The design of the device takes into account the multiple goals of easy operation, simple maintenance, and improving corn processing efficiency and economic value. Through automated operation processes, it can bring significant efficiency improvements and cost savings to agricultural production.

[0079] In this device, corn cobs are trapped in the threshing structure after corn threshing. Although the corn kernels and corn cobs can be automatically separated, the corn cobs need to be discharged from the slag outlet, which may cause the corn kernels to be discharged together with the corn cobs. In addition, the corn cobs cannot be discharged in time, which will affect the normal operation of the threshing structure. In addition, this device can screen corn of different sizes, but it cannot screen out moldy and diseased corn kernels.

[0080] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0081] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0082] The present invention provides a corn threshing and screening device, comprising: a corn thresher 1, used for separating corn into corn cobs and corn grains. Specifically, the corn thresher 1 comprises 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 the existing structure and can separate corn grains from corn cobs. It should be noted that this embodiment is used for dried corn.

[0083] The screening plate 2 is tiltedly arranged below the discharge port 102 of the corn thresher 1. The screening plate 2 includes a side plate 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 particles from overflowing from the bottom plate 202. The bottom plate 202 is provided with a through groove through the upper and lower surfaces. The inner diameter of the through groove is smaller than the outer diameter of the corn cob and slightly larger than the size of the corn particles, so that the corn particles can pass through, but large particles such as corn cobs and stones cannot pass through. The first conveying mechanism 3 (conveyor belt) is arranged below the screening plate 2. The corn particles can fall into the first conveying mechanism 3 from the through groove. The first conveying mechanism 3 is used to convey the corn particles to the screening mechanism. The screening mechanism is used to screen out moldy and diseased corn particles from the corn particles. The collecting cylinder 4 is connected to the lower end of the screening plate 2 and is located on the left side of the first conveying mechanism 3 to collect corn cobs. The first conveying mechanism 3 conveys corn particles in a direction away from the collecting cylinder 4 (right side).

[0084] In this embodiment, the through slots include a first through slot 5 and a second through slot 6, and the first through slot 5 and the second through slot 6 are arranged substantially in a V-shape. One end of the first through slot 5 is disposed at a lower end of the bottom plate 202 and close to the left side of the bottom plate 202, one end of the second through slot 6 is disposed at a lower end of the bottom plate 202 and close to the right side of the bottom plate 202, and the other end of the first through slot 5 and the other end of the second through slot 6 are connected and disposed at a higher end of the bottom plate 202 and located in the middle of the bottom 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 has a conveyor belt, and the conveyor belt is provided with a plurality of ventilation holes through the upper and lower surfaces; an air supply mechanism is arranged below the second conveying mechanism 7, and is used to blow air from bottom to top to the conveyor belt and separate the moldy and diseased corn particles from the conveyor belt; a collecting mechanism is arranged above the second conveying mechanism 7, and is used to collect the moldy and diseased corn particles.

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

[0087] In this embodiment, the collecting mechanism includes: an air collecting hood 8, which is arranged above the second conveying mechanism 7 and has an induced draft fan; a collecting bag 9 is connected to the air collecting hood 8 through a ventilation pipe, and the collecting bag 9 is used to collect moldy and diseased corn particles.

[0088] In this embodiment, the screening mechanism also includes a box body 10, which has an upper opening; the multi-layer elastic screen 11 has elastic meshes, and the multi-layer elastic screen 11 is arranged in the box body 10 in the order of increasing elastic meshes 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 corn particles; a longitudinal vibrator 12 is arranged at the bottom of the box body 10, and the longitudinal vibrator 12 is used to vibrate the multi-layer elastic screen 11 and intercept moldy and diseased corn particles on the elastic screen 11 arranged at the top.

[0089] In this embodiment, it also includes a body 13; the screening plate 2, the collecting barrel 4, the first conveying mechanism 3, the second conveying mechanism 7, the air supply mechanism, and the box 10 are all arranged in the body 13, the air collecting hood 8 is arranged on the top of the body 13, the corn thresher 1 is arranged on the body 13, and its discharge port 102 extends into the body 13, the collecting bag 9 is arranged on the body 13, and the body 13 is provided with an air inlet 1301 corresponding to the air supply mechanism; the body 13 is provided with a plurality of discharge ports 1302 corresponding to the multi-layer elastic screen 11, 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; the body 13 is provided with a flip cover corresponding to the collecting barrel 4, and the flip cover can be opened to take out the entire collecting barrel 4 or the corn cobs and impurities inside the collecting barrel 4. The rotating mechanism is connected to the box 10, and can rotate the box 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 connection part. The flexible connection part can meet the rotation requirement of the box body 10 , and can be stretched when the box body 10 rotates to maintain the connection relationship with the elastic screen 11 .

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

[0091] In this embodiment, a corn grading mechanism is also included, which has multiple layers of grading screens. The multiple layers of grading screens are arranged 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 working process is as follows:

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

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

[0095] S3: The corn particles move along the first conveying mechanism 3 and fall into the second conveying mechanism 7; the second conveying mechanism 7 adopts a vibrating conveyor belt, under which the corn particles perform periodic parabolic motion, and the motion direction is to the right. During the process, the air supply mechanism below the second conveying mechanism 7 continuously blows air upwards. Since the normal corn particles and the moldy and diseased corn particles have different specific gravities in the air, the moldy and diseased corn particles and light impurities mixed in the normal corn particles can be blown upwards by the air and separated from the second conveying mechanism 7. The induced draft fan in the air collecting hood 8 absorbs the moldy and diseased corn particles and light impurities upwards, and sends them into the collecting bag 9 through the air collecting hood 8 and the ventilation pipe, and the air is discharged through the gaps in the collecting bag 9.

[0096] S4: The corn particles move along the second conveying mechanism 7 and fall into the elastic screen 11 on the uppermost layer; the longitudinal vibrator 12 generates longitudinal vibrations on the box 10, so that all the elastic screens 11 and the corn particles on the elastic screens 11 vibrate together, and the corn particles will jump longitudinally. Since the density and weight of normal corn particles are different from those of moldy and diseased corn particles, the normal corn particles can overcome the elastic force of the elastic mesh, pass through the upper elastic screen 11, and fall into the lower elastic screen 11 in sequence. The moldy and diseased corn particles cannot overcome the elastic force of the elastic screen 11 and are trapped in the upper elastic screen 11. Through the synergistic effect of the multiple layers of elastic screens 11 and the longitudinal vibrator 12, all the moldy and diseased corn particles remaining in the normal corn particles are screened out.

[0097] S5: Start the cylinder 14, and the box body 10 rotates in the clockwise direction. At this time, all the elastic screens 11 are in a tilted state. The corn particles on the elastic screens 11 slide downward by their own gravity and are discharged from their corresponding discharge ports 1302. Normal corn particles and moldy and diseased corn particles are collected in different containers respectively.

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

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

[0100] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A corn threshing and screening device, characterized in that: include: A corn thresher (1) for separating corn into corn cobs and corn kernels; A screening plate (2) is obliquely arranged below the discharge port (102) of the corn thresher (1), wherein the screening plate (2) is provided with through grooves penetrating the upper and lower surfaces, and the inner diameter of the through groove is smaller than the outer diameter of the corn cob; A first conveying mechanism (3) is arranged below the screening plate (2), and corn particles can fall into the first conveying mechanism (3) from the through slot. The first conveying mechanism (3) is used to convey the corn particles to the screening mechanism, and the screening mechanism is used to screen out moldy and diseased corn particles from the corn particles. The collecting cylinder (4) is connected to the lower end of the screening plate (2) and is used for collecting corn cobs.

2. A corn threshing and screening device according to claim 1, characterized in that: The through groove comprises a first through groove (5) and a second through groove (6); one end of the first through groove (5) is arranged at a lower end of the screening plate (2) and close to the left side of the screening plate (2); one end of the second through groove (6) is arranged at a lower end of the screening plate (2) and close to the right side of the screening plate (2); the other end of the first through groove (5) is connected to the other end of the second through groove (6) and is arranged at the higher end of the screening plate (2).

3. A corn threshing and screening device according to claim 2, characterized in that: The first conveying mechanism (3) conveys corn particles in a direction away from the collecting cylinder (4).

4. A corn threshing and screening device according to claim 3, characterized in that: The screening agencies include: A second conveying mechanism (7), corresponding to the tail end of the first conveying mechanism (3), the second conveying mechanism (7) having a conveying belt, the conveying belt having a plurality of ventilation holes disposed on the upper and lower surfaces thereof; An air supply mechanism is arranged below the second conveying mechanism (7) and is used to blow air from bottom to top to the conveying belt and separate the moldy and diseased corn particles from the conveying belt; The collecting mechanism is arranged above the second conveying mechanism (7) and is used for collecting moldy and diseased corn particles.

5. A corn threshing and screening device according to claim 4, characterized in that: The second conveying mechanism (7) is a vibrating conveyor belt.

6. A corn threshing and screening device according to claim 5, characterized in that: The collection agencies include: An air collecting hood (8) is arranged above the second conveying mechanism (7) and has an induced draft fan; The collecting bag (9) is connected to the air collecting hood (8) through a ventilation pipe, and the collecting bag (9) is used to collect moldy and diseased corn particles.

7. A corn threshing and screening device according to claim 6, characterized in that: The screening mechanism also includes: A box body (10), wherein the box body (10) has an upper opening; A multi-layer elastic screen (11) having elastic meshes, wherein the multi-layer elastic screens (11) are arranged in the box body (10) in an order in which the elastic meshes increase from bottom to top, and the uppermost layer of the elastic screen (11) corresponds to the rear end of the second conveying mechanism (7), and the size of the elastic meshes is smaller than the size of corn grains; A longitudinal vibrator (12) is arranged at the bottom of the box (10), and is used to vibrate the multiple layers of the elastic screen (11) and to intercept the moldy and diseased corn particles on the elastic screen (11) arranged on the upper side.

8. A corn threshing and screening device according to claim 7, characterized in that: Also includes: A machine body (13); the screening plate (2), the collecting cylinder (4), the first conveying mechanism (3), the second conveying mechanism (7), the air supply mechanism, and the box (10) are all arranged in the machine body (13); the air collecting hood (8) is arranged on the top of the machine body (13); the corn thresher (1) is arranged on the machine body (13), and its discharge port (102) extends into the machine body (13); the collecting cloth bag (9) is arranged on the machine body (13); and the machine body (13) is provided with an air inlet (1301) corresponding to the air supply mechanism; A flexible connection part, wherein the body (13) is provided with a plurality of discharge ports (1302) corresponding to the multi-layer elastic screen (11), 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 box (10) and is capable of rotating the box (10) to a position where the elastic screen (11) is tilted. When the elastic screen (11) is tilted, its lower end corresponds to the flexible connection portion.

9. A corn threshing and screening device according to claim 8, characterized in that: The rotating mechanism comprises: The cylinder (14) has a bottom hinged to a first hinge seat (15), the first hinge seat (15) is fixed to the bottom surface of the machine body (13), the output end of the cylinder (14) is hinged to a second hinge seat (16), and the second hinge seat (16) is fixed to an end of 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 is hinged to the third hinge seat (17), and the third hinge seat (17) is fixed to one end of the bottom surface of the box body (10) close to the discharge port (1302).

10. A corn threshing and screening device according to claim 8, characterized in that: Also includes: The corn grading mechanism has multiple layers of grading screens, which are arranged in a sequence of increasing mesh sizes from bottom to top, and the topmost grading screen corresponds to the lower discharge port (1302).

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