Graded screening device for grains

Abstract

The invention discloses a grain grading and screening device which comprises a box body, a feeding port, a discharging port, a screening device, a screening device and a control device. The box body is provided with a feeding port; the box body is internally provided with a falling channel; the empty grain sieve fan is arranged on one side of the falling channel; the half-air grain sieve fan is arranged on one side of the falling channel, and the half-air grain sieve fan is located below the empty grain sieve fan; the conveying mechanism is arranged on the other side of the falling channel and below the falling channel; the weighing assembly is located at the downstream of the conveying mechanism; and the grain counter is used for receiving and counting the empty grains, the half-empty grains and the full grains which are weighed by the weighing assembly. The grain grading and screening device can accurately screen empty grains, half-empty grains and full grains, weighing and counting are carried out according to the grains of different classifications obtained through screening, the rice yield can be estimated easily, and the grain grading and screening device belongs to the technical field of grain screening.

Description

Technical Field

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

[0002] Traditional grain grading mainly relies on manual visual sorting or simple mechanical tools, which are inefficient and inconsistent. With the gradual popularization of mechanized screening equipment, typical devices include vibrating screens and drum screens, which use multiple layers of screens to achieve grading according to particle size differences. This type of mechanical structure is simple and low-cost, but there are problems such as easy clogging of the screen holes, high sensitivity to humidity, and limited accuracy (especially for flat or irregular particles). In addition, gravity screening and air separation technology can separate light impurities (such as straw and empty grains) by combining particle density and aerodynamic properties, but the processing capacity and adaptability are still insufficient.

[0003] In the above-mentioned prior art, the vibrating screen and the drum screen can only screen grains of different particle sizes, but cannot screen grains of the same particle size, nor can they distinguish whether the grains are full or empty; the wind selection technology can screen whether the grains are full or empty, but during the screening process of the existing wind selection technology, the empty grains or half-empty grains are blown out, which has the problem of recovery difficulties, affecting the accuracy of the experimental data. Summary of the invention

[0004] In view of the above shortcomings, the present invention provides a grain grading and screening device to solve the problem that the empty grains or half-empty grains are blown out in the prior art, which makes recovery difficult and affects the accuracy of experimental data.

[0005] The specific technical solutions are as follows:

[0006] A grain grading and screening device, comprising:

[0007] A box body, wherein the box body has a feed inlet, and a falling channel is arranged in the box body and communicates with the feed inlet;

[0008] An empty grain sifting fan is arranged at one side of the falling channel, and the empty grain sifting fan blows air toward the falling channel;

[0009] A half-empty grain sieving fan is arranged at one side of the falling channel, and the half-empty grain sieving fan is located below the empty grain sieving fan, and the half-empty grain sieving fan blows air toward the falling channel;

[0010] The conveying mechanism is arranged on the other side of the falling channel and below the falling channel, the conveying mechanism located on the other side of the falling channel is used to receive the empty grains and half-empty grains blown by the empty grain screening fan and the half-empty grain screening fan, and the conveying mechanism located below the falling channel is used to receive full grains;

[0011] A weighing assembly, which is located downstream of the conveying mechanism and is used to receive and weigh the empty grains, half-empty grains and full grains conveyed by the conveying mechanism;

[0012] Grain counter, the grain counter is used to receive and count the empty grains, half-empty grains and full grains weighed by the weighing component.

[0013] Preferably, a funnel is provided at the feed inlet, and an end cover is provided at the top opening of the funnel, and the end cover is hinged to the funnel.

[0014] Preferably, the falling channel is a closed structure with openings at both ends and all around, and the falling channel is connected with the empty grain screening fan, the half-empty grain screening fan and the conveying mechanism.

[0015] Preferably, the conveying mechanism includes a first conveyor belt, a second conveyor belt and a third conveyor belt, which are installed in sequence from top to bottom in the box, one end of the first conveyor belt corresponds to the empty grain screening fan, one end of the second conveyor belt corresponds to the half-empty grain screening fan, and one end of the third conveyor belt is located below the falling channel.

[0016] Preferably, a collecting structure is provided at one end where the first conveyor belt and the second conveyor belt are connected to the falling channel, and a connecting port connected to the first conveyor belt and the second conveyor belt is provided on the other side of the falling channel, the two connecting ports respectively correspond to the positions of the empty grain screen fan and the half-empty grain screen fan, and the two collecting structures are respectively connected to the two connecting ports, and the two collecting structures are respectively located above the first conveyor belt and the second conveyor belt.

[0017] Preferably, the collecting structure includes four baffles, which are sequentially connected to form a collecting channel with a rectangular cross-section, and the collecting channel is inclined outward and downward from the falling channel.

[0018] Preferably, a conveying channel is provided between the conveying mechanism and the weighing assembly, a scraper is provided at the contact point between the conveying channel and the conveying mechanism, the scraper is in contact with the first conveyor belt and the second conveyor belt of the conveying mechanism; the other end of the conveying channel faces the weighing assembly.

[0019] Preferably, the weighing assembly comprises a base, a weighing sensor and a carrying plate, the weighing sensor is arranged on the base, and the carrying plate is placed on the weighing sensor.

[0020] Preferably, it also includes a grabbing mechanism, which is used to grab the carrying plate to above the feeding port of the grain counter.

[0021] Preferably, the number of the half-empty grain sieve fans is at least two, and at least two half-empty grain sieve fans are spaced apart and distributed on one side of the falling channel.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The grain grading and screening device of the present invention respectively arranges a screening fan and a conveying mechanism on both sides of the falling channel to accurately screen empty grains, half-empty grains and full grains and classify and recover them, and then transports them to a weighing component for weighing. After weighing, they are transported to a grain counter for counting to obtain randomly sampled grain data, which is convenient for estimating the rice yield of the year.

[0024] 2. The present invention can further ensure the accuracy of half-empty grain screening by arranging at least two half-empty grain screening fans and conveyor belts corresponding to the at least two half-empty grain screening fans.

[0025] 3. The present invention arranges the carrying plate of the weighing component into a placement structure, so that the carrying plate can be used in conjunction with a grabbing mechanism to grab the grains and place them on the counter, or the carrying plate can be manually taken out and poured back from the feed port of the box for secondary screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0027] Figure 1 The present invention is a stereoscopic diagram of a grain grading and screening device.

[0028] Figure 2 It is a left view of a grain grading and screening device.

[0029] Figure 3 for Figure 2 BB cross-sectional view.

[0030] Figure 4 for Figure 2 BB cross-sectional view, wherein the number of the second conveyor belt and the number of the semi-empty grain screen fans are both two.

[0031] Figure 5 It is a three-dimensional diagram of a grain grading and screening device after the box body is removed.

[0032] 1 is a box body, 11 is a funnel, 12 is a feed port, 2 is an empty grain screen fan, 3 is a half-empty grain screen fan, 4 is a second opening and closing door, 5 is a falling channel, 6 is a collecting structure, 7 is a first conveyor belt, 8 is a second conveyor belt, 9 is a third conveyor belt, 10 is a conveying channel, 101 is a main channel, 102 is an auxiliary channel, 20 is a weighing component, 201 is a base, 202 is a carrying plate, 30 is a grain counter, 40 is a grabbing mechanism, 401 is a rotating motor, 402 is a transmission rod, and 403 is a clamp. DETAILED DESCRIPTION

[0033] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment 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.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] like Figure 1-Figure 5 As shown, this embodiment provides a grain grading and screening device, comprising:

[0038] The box body 1 has a feed port 12, and a drop channel 5 is provided in the box body 1 and communicates with the feed port 12;

[0039] An empty grain sifting fan 2 is arranged at one side of the falling channel 5, and the empty grain sifting fan 2 blows air toward the falling channel 5;

[0040] A half-empty grain sifting fan 3 is arranged at one side of the falling channel 5, and the half-empty grain sifting fan 3 is located below the empty grain sifting fan 2, and the half-empty grain sifting fan 3 blows air toward the falling channel 5;

[0041] The conveying mechanism is arranged on the other side of the falling channel 5 and below the falling channel 5. The conveying mechanism located on the other side of the falling channel 5 is used to receive the empty grains and half-empty grains blown by the empty grain screening fan 2 and the half-empty grain screening fan 3. The conveying mechanism located below the falling channel 5 is used to receive full grains.

[0042] A weighing assembly 20, which is located downstream of the conveying mechanism and is used to receive and weigh the empty grains, half-empty grains and full grains conveyed by the conveying mechanism;

[0043] The grain counter 30 is used to receive and count the empty grains, half-empty grains and full grains weighed by the weighing assembly 20. Specifically, the grain counter 30 preferably uses image recognition or a high-precision photoelectric counter (such as Zhejiang Top TPK-1).

[0044] In some embodiments, the grain counter 30 can also be set outside the box, and the staff can pour the grains in the carrying tray into the grain counter 30.

[0045] A funnel 11 is provided at the feed port 12, and an end cover is provided at the top opening of the funnel 11, and the end cover is hinged to the funnel 11. Specifically, in order to prevent the funnel from being blocked by grains, a vibration motor can be provided at the funnel, and the funnel can be shaken by the vibration motor to make the blocked grains fall down with power.

[0046] The falling channel 5 is a structure with openings at both ends and a closed structure on all sides. The falling channel 5 is connected with the empty grain screening fan 2, the half-empty grain screening fan 3 and the conveying mechanism.

[0047] The conveying mechanism includes a first conveyor belt 7, a second conveyor belt 8 and a third conveyor belt 9. The first conveyor belt 7, the second conveyor belt 8 and the third conveyor belt 9 are installed in sequence from top to bottom in the box body 1. One end of the first conveyor belt 7 corresponds to the empty grain screening fan 2, one end of the second conveyor belt 8 corresponds to the half-empty grain screening fan 3, and one end of the third conveyor belt 9 is located below the falling channel 5.

[0048] A guide baffle can be provided between the third conveyor belt 9 and the falling channel 5, and the guide baffle can prevent the full grains from falling around the third conveyor belt 9 when falling off the third conveyor belt 9, thereby causing errors in the subsequent weighing and counting data.

[0049] The first conveyor belt 7 and the second conveyor belt 8 are provided with a collecting structure 6 at one end that is docked with the falling channel 5, and the other side of the falling channel 5 is provided with a connecting port that is docked with the first conveyor belt 7 and the second conveyor belt 8. The two connecting ports correspond to the positions of the empty grain screen fan 2 and the half-empty grain screen fan 3, respectively. The two collecting structures 6 are connected to the two connecting ports, respectively, and the two collecting structures 6 are respectively located above the first conveyor belt 7 and the second conveyor belt 8. Specifically, the first conveyor belt 7, the second conveyor belt 8 and the third conveyor belt 9 have the same structure, and all include a motor, a driving roller, a conveyor belt, a roller and a roller, and a PLC module. The driving roller, the roller and the roller are all rotatably connected to the box body 1. The driving roller, the roller and the roller are all located in the box body 1. The motor is installed outside the box body 1. The output shaft of the motor is fixedly connected to the driving roller, driving the driving roller to rotate relative to the box body 1. The conveyor belt is respectively wound around the driving roller, the roller and the roller. The roller acts as a driven roller to change the running direction of the conveyor belt or increase the wrap angle. A reducer can also be connected between the motor and the driving roller to reduce the speed and increase the torque (such as a gear reducer or a planetary reducer). The drive roller drives the conveyor belt through friction. The conveyor belt can be supported by rollers. A guide trough can also be set on the conveyor belt to guide the material to the center of the conveyor belt. Baffles / skirts can be set on both sides of the conveyor belt to prevent the material from spilling sideways. The PLC module adjusts the speed and start and stop of the conveyor belt.

[0050] The collecting structure 6 includes four baffles, which are connected in sequence to form a collecting channel with a rectangular cross section, and the collecting channel is inclined outward and downward from the falling channel 5. By setting the collecting channel inclined outward and downward from the falling channel 5, when the grains pass through the empty grain screening fan 2 and the half-empty grain screening fan 3, the empty grains and the half-empty grains are blown into the collecting channel respectively, and the collecting channel is inclined so that after being blown into the collecting channel, the empty grains and the half-empty grains slide from the collecting channel to the corresponding conveyor belt.

[0051] In some embodiments, a guide baffle can also be set at the port of the collecting channel facing the conveying mechanism. An angle is formed between the guide baffle and the port of the collecting channel facing the conveying mechanism. The angle can be set to 30-60 degrees. Considering that the grains continue to move after being blown into the collecting channel, the guide baffle is set to 45 degrees. After hitting the guide baffle, the grains fall freely onto the conveying mechanism.

[0052] In some embodiments, considering that after the empty grains are blown into the collecting channel, due to their small mass, they will slide to the conveying mechanism only by relying on their own weight, and some of the empty grains may remain in the collecting channel. Therefore, a vibration motor can be arranged outside the collecting channel to make the empty grains remaining in the collecting channel fall onto the conveying mechanism.

[0053] A conveying channel 10 is provided between the conveying mechanism and the weighing assembly 20. A scraper is provided at the contact point between the conveying channel 10 and the conveying mechanism. The scraper is in contact with the first conveyor belt 7 and the second conveyor belt 8 of the conveying mechanism. The other end of the conveying channel 10 faces the weighing assembly 20. Specifically, the conveying channel 10 includes a main channel 101 and a secondary channel 102. The main channel 101 is provided on the side wall of the box body 1. The top end of the main channel 101 is closed, and the bottom end of the main channel 101 is open. The number of secondary channels 102 corresponds to the number of conveyor belts of the conveying mechanism. A scraper is provided at the connection point between each secondary channel 102 and the corresponding conveyor belt. It should be noted that the main channel 101 can be a hollow cylinder or cube structure, and the secondary channel 102 is a rectangular trough structure. The secondary channel 102 is connected to the inside of the main channel 101. The width of the connection between the secondary channel 102 and the corresponding conveyor belt is greater than the width of the corresponding conveyor belt, ensuring that all the grains transported by the conveyor belt are transported into the secondary channel 102. The length of the scraper is consistent with the width of the conveyor belt, so that the scraper can scrape all the grains transported by the conveyor belt into the secondary channel 102.

[0054] In some embodiments, in order to ensure that the grains in the conveying channel 10 are smoothly transported to the weighing assembly 20, a vibration motor can be installed on the outside of the conveying channel 10 to drive the conveying channel 10 to vibrate, so that the grains in the conveying channel 10 are vibrated and transported to the weighing assembly 20.

[0055] The weighing assembly 20 includes a base 201, a weighing sensor and a carrier plate 202. The weighing sensor is arranged on the base 201, and the carrier plate 202 is placed on the weighing sensor. Exemplarily, a display, a signal conditioning circuit, an analog-to-digital converter, a single-chip microcomputer (microcontroller / microprocessor MCU / MPU), a power module, and an input interface are arranged on the base 201. The output end of the sensor is connected to the signal conditioning circuit to amplify and optimize the signal. The analog signal conditioned by the signal conditioning circuit is input to the ADC for digitization. The analog-to-digital converter transmits the digital signal to the MCU through the SPI / I2C interface. The single-chip microcomputer drives the display through a parallel bus or a serial interface (such as UART). The power module provides different voltages (such as 5V, 3.3V) for the weighing sensor, MCU, display, etc.

[0056] The weighing principle of the weighing assembly 20 is as follows: the grains are transported to the carrier plate 202 → the force is transmitted to the weighing sensor → an electrical signal is generated.

[0057] The signal is amplified and filtered by the conditioning circuit → ADC converts it into a digital signal.

[0058] The MCU processes the data (calibration, unit conversion) → the results are output to the display.

[0059] In some embodiments, the grain grading and screening device further includes a gripping mechanism 40, which is used to grip the carrier plate 202 to above the feed port of the grain counter 30. Exemplarily, the gripping mechanism 40 includes a rotating motor 401, a transmission rod 402, and a clamp 403. The rotating motor 401 is fixed to the bottom of the box 1, the rotating motor 401 is fixedly connected to one end of the transmission rod 402, and the other end of the transmission rod 402 is connected to the clamp 403, and the clamp 403 clamps one side of the carrier plate 202; the number of the gripping mechanisms 40 is two, and the two gripping mechanisms 40 are symmetrically distributed in the box 1, and the other gripping mechanism 40 clamps the other side of the carrier plate 202. After the empty grains, half-empty grains or full grains are weighed, the rotating motor 401 is started to drive the transmission rod 402 to rotate, the transmission rod 402 drives the clamp 403 to rotate, the clamp 403 clamps the carrier plate 202 to rotate, flips to the feed port of the grain counter 30, and pours the empty grains, half-empty grains or full grains into the grain counter 30 for counting.

[0060] In some embodiments, the box body 1 is provided with an opening and closing door, which is hinged to the box body 1 through a hinge. When the grains need to be circulated and screened, the opening and closing door is opened, the carrying plate 202 is taken out, and the grains in the carrying plate 202 are poured into the feeding port of the box body 1, and the screening process is performed again to ensure the accuracy of the screening. The positions of the opening and closing door and the weighing assembly 20 correspond to each other.

[0061] A second opening and closing door 4 is provided on one side of the box body 1. The position of the second opening and closing door 4 corresponds to the position of the grain counter 30, which is convenient for taking out the grains after the grain counter 30 has finished counting, and is also convenient for recording the counted number of the grain counter 30.

[0062] It should be noted that a positioning frame is provided in the box body 1 , and the positioning frame is used to position the grain counter 30 to ensure that the grasping mechanism 40 grasps the carrying plate 202 and turns it over to correspond to the grain counter 30 .

[0063] A corresponding adjustment block may be provided in the positioning frame, and the adjustment block may be connected to the positioning frame via a screw rod, and the adjustment block may be brought into contact with the grain counter 30 for positioning by rotating the screw rod.

[0064] In some embodiments, the number of the half-empty grain sifting fans 3 is at least two, and at least two half-empty grain sifting fans 3 are spaced apart on one side of the falling channel 5. Exemplarily, the number of the half-empty grain sifting fans 3 is two, and the two half-empty grain sifting fans 3 are spaced apart on one side of the falling channel 5, and two second conveyor belts 8 corresponding thereto are arranged on the other side of the falling channel 5; by arranging the half-empty grain sifting fans 3 in this way, most of the half-empty grains can be blown onto the second conveyor belt 8, solving the problem that the half-empty grains cannot be smoothly blown onto the second conveyor belt 8 because they are blocked by full grains when passing through the half-empty grain sifting fans 3 during the falling process, and at the same time, setting two half-empty grain sifting fans 3 can solve the problem that the half-empty grains cannot effectively blow the half-empty grains onto the second conveyor belt 8 because the half-empty grain sifting fans 3 pass through the half-empty grain sifting fans 3 during the falling process due to the short time of passing through the half-empty grain sifting fans 3.

[0065] By integrating the empty grain sieve fan 2, the half-empty grain sieve fan 3, the weighing component and the grain counter into the box, space is saved and the box is suitable for laboratory environment.

[0066] Principle: After the user randomly obtains a pound of grains in the field and brings them back to the laboratory, he starts the empty grain screening fan 2 and the half-empty grain screening fan 3, and pours the grains from the feeding port of the box 1. The empty grain screening fan 2 and the half-empty grain screening fan 3 blow the empty grains and the half-empty grains to the collecting structure 6 corresponding to the first conveyor belt 7 and the second conveyor belt 8 respectively. The empty grains and the half-empty grains fall to the first conveyor belt 7 and the second conveyor belt 8 respectively by their own weight or by the cooperation of the empty grains and the half-empty grains and the vibration motor. The first conveyor belt 7 and the second conveyor belt 8 are started respectively, so that the empty grains and the half-empty grains are sequentially conveyed to the conveying channel 10, and the third conveyor belt 9, after receiving the full grains dropped from the falling channel 5, also conveys the full grains to the conveying channel 10, and some The empty grains and half-empty grains fall freely to the conveying channel 10, the remaining empty grains and half-empty grains are scraped by the scraper to the conveying channel 10, and the full grains fall freely to the conveying channel 10. The empty grains, half-empty grains and full grains are conveyed separately, and the weighing component 20 weighs the empty grains, half-empty grains and full grains respectively to obtain the weight data of the empty grains, half-empty grains and full grains, and then the carrying plates 202 containing the empty grains, half-empty grains and full grains are grabbed and flipped into the grain counter 30 by the grabbing mechanism 40. The grain counter 30 counts the number of empty grains, half-empty grains and full grains respectively to obtain the weight and number of the empty grains, half-empty grains and full grains in this kilogram of grains, so as to facilitate the estimation of the rice yield in that year.

[0067] It should be noted that in order to ensure that the empty grains and half-empty grains are blown onto the first conveyor belt 7 and the second conveyor belt 8 respectively, the corresponding wind forces of the empty grain screening fan 2 and the half-empty grain screening fan 3 can be tested and adjusted according to the known grain information. For example, take some full grains for testing. The first two types of fans cannot blow them to the corresponding channels, proving that the test results of the full grains are accurate. The same is true for the other two types of grains. The empty grains and half-empty grains are placed separately in the falling channel 5. If the known empty grains and half-empty grains are blown onto the first conveyor belt 7 and the second conveyor belt 8 respectively, it proves that the wind force of the empty grain screening fan 2 and the half-empty grain screening fan 3 can accurately blow the empty grains and half-empty grains to the corresponding channels. After testing in this way and adjusting the corresponding wind force, the experimental grains can be weighed and counted to obtain accurate experimental data and predict the rice yield of the year.

[0068] It should be noted that, considering that vibration motors are needed in many places to solve grain blockage or transportation problems, vibration motors usually use small vibration motors of electromagnetic type (ERM) or linear offset type (LRA). Because only grains with smaller mass need to be vibrated, there is no need for a vibration motor that is too large. Of course, if these two types of vibration motors cannot cooperate with the corresponding structure to transport the grains, they can be replaced with other suitable vibration motors.

[0069] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A grain grading and screening device, characterized in that: include: A box body, wherein the box body has a feed inlet, and a falling channel is arranged in the box body and communicates with the feed inlet; An empty grain sifting fan is arranged at one side of the falling channel, and the empty grain sifting fan blows air toward the falling channel; A half-empty grain sieving fan is arranged at one side of the falling channel, and the half-empty grain sieving fan is located below the empty grain sieving fan, and the half-empty grain sieving fan blows air toward the falling channel; The conveying mechanism is arranged on the other side of the falling channel and below the falling channel, the conveying mechanism located on the other side of the falling channel is used to receive the empty grains and half-empty grains blown by the empty grain screening fan and the half-empty grain screening fan, and the conveying mechanism located below the falling channel is used to receive full grains; A weighing assembly, which is located downstream of the conveying mechanism and is used to receive and weigh the empty grains, half-empty grains and full grains conveyed by the conveying mechanism; Grain counter, the grain counter is used to receive and count the empty grains, half-empty grains and full grains weighed by the weighing component.

2. A grain grading and screening device according to claim 1, characterized in that: A funnel is arranged at the feed inlet, and an end cover is arranged at the top opening of the funnel, and the end cover is hinged to the funnel.

3. A grain grading and screening device according to claim 1, characterized in that: The falling channel is a closed structure with openings at both ends and all around, and the falling channel is connected with the empty grain screening fan, the half-empty grain screening fan and the conveying mechanism.

4. A grain grading and screening device according to claim 1, characterized in that: The conveying mechanism includes a first conveyor belt, a second conveyor belt and a third conveyor belt. The first conveyor belt, the second conveyor belt and the third conveyor belt are installed in sequence from top to bottom in the box. One end of the first conveyor belt corresponds to the empty grain screening fan, one end of the second conveyor belt corresponds to the half-empty grain screening fan, and one end of the third conveyor belt is located below the falling channel.

5. A grain grading and screening device according to claim 4, characterized in that: A collecting structure is provided at one end where the first conveyor belt and the second conveyor belt are connected to the falling channel, and a connecting port connected to the first conveyor belt and the second conveyor belt is provided on the other side of the falling channel. The two connecting ports correspond to the positions of the empty grain screen fan and the half-empty grain screen fan respectively, and the two collecting structures are connected to the two connecting ports respectively, and the two collecting structures are respectively located above the first conveyor belt and the second conveyor belt.

6. A grain grading and screening device according to claim 5, characterized in that: The collecting structure comprises four baffles, which are connected in sequence to form a collecting channel with a rectangular cross section, and the collecting channel is inclined outward and downward from the falling channel.

7. A grain grading and screening device according to claim 1, characterized in that: A conveying channel is provided between the conveying mechanism and the weighing assembly. A scraper is provided at the contact point between the conveying channel and the conveying mechanism. The scraper contacts the first conveyor belt and the second conveyor belt of the conveying mechanism. The other end of the conveying channel faces the weighing assembly.

8. The grain grading and screening device according to claim 1, characterized in that: The weighing assembly comprises a base, a weighing sensor and a bearing plate. The weighing sensor is arranged on the base, and the bearing plate is placed on the weighing sensor.

9. A grain grading and screening device according to claim 8, characterized in that: The utility model also comprises a grabbing mechanism, which is used for grabbing the carrying plate to above the feeding port of the grain counter.

10. The grain grading and screening device according to claim 1, characterized in that: The number of the half-empty grain screen fans is at least two, and at least two half-empty grain screen fans are distributed at intervals on one side of the falling channel.

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