Castanea henryi fruit screening device
By designing a multi-stage screening device and transmission mechanism, the problems of low screening efficiency and high damage rate of chestnuts are solved, realizing efficient and low-damage multi-variety adaptive screening, which is suitable for the grading and screening of chestnuts.
Patent Information
- Application Number
- CN202511225672.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2025-10-17
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the current chestnut screening process, manual screening is inefficient and inaccurate, and mechanical screening devices cause high damage to the fruit and are difficult to adapt to the diverse chestnut varieties. Intelligent screening is costly and has limited its adoption by small and medium-sized growers.
Design a multi-stage screening device that uses multi-stage screening plates and transmission mechanisms, combined with motor drive and eccentric wheel vibration, to achieve graded screening of fruits. By independently controlling each level of screening plates, it can adapt to the separation requirements of different particle sizes, and reduce mechanical impact and fruit damage through spring and cam mechanisms.
It improves the efficiency and accuracy of chestnut screening, reduces fruit damage rate, adapts to the screening needs of multiple varieties of chestnuts, and reduces equipment energy consumption and operating costs.
Smart Images
Figure CN120790482A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of chestnut fruit screening equipment, and particularly relates to a chestnut fruit screening device. BACKGROUND
[0002] Chestnut fruit, commonly known as tea chestnut, belongs to the plant of Castanea genus of Fagaceae family, is a kind of natural woody food, chestnut kernel is rich in comprehensive nutritional ingredients and excellent taste, has high economic value and medicinal value, and is usually used for making chestnut wine and chestnut cake.
[0003] The chestnut fruit needs to be screened in shape and size during processing, and workers usually use a screen to manually screen, the screened chestnut fruit has large size error, the labor intensity of workers is high, the working efficiency is low, and the subsequent processing efficiency and quality of the chestnut fruit are affected. SUMMARY
[0004] The present application aims to provide a chestnut fruit screening device to solve the problems existing in the prior art.
[0005] To achieve the above-mentioned purpose, the present application provides the following scheme: the present application provides a chestnut fruit screening device, which comprises a screening box, one side of the screening box is provided with a feeding port, one side of the screening box close to the feeding port is provided with a first screening plate, the side surface of the first screening plate is provided with a first driving mechanism, the first driving mechanism is in transmission connection with the first screening plate, the lower side of the first screening plate is provided with a first collecting plate, the lower side of the first collecting plate away from the first screening plate is rotationally connected with a second screening plate, the lower side of the second screening plate is in transmission connection with a second collecting plate through a transmission mechanism, the bottom of the second collecting plate is provided with a second driving mechanism, a third collecting plate is arranged between the second screening plate and the second collecting plate, the third collecting plate is located below the first collecting plate, the first collecting plate is in communication with a first collecting port, the second collecting plate is in communication with a second collecting port, and the third collecting plate is in communication with a third collecting port.
[0006] Preferably, the two sides of the first screening plate are respectively and symmetrically provided with first through holes, a first connecting shaft is slidably connected in the first through hole, the first connecting shaft is fixedly connected with the inner wall of the screening box, a first connecting seat is fixedly connected to one side of the first screening plate, the first connecting seat is in transmission connection with the first driving mechanism, and a first spring is arranged outside the first connecting shaft away from the first driving mechanism.
[0007] Preferably, the first driving mechanism comprises a first motor fixedly connected with the inner wall of the screening box, the output shaft of the first motor is fixedly connected with a cam, and the cam is in abutment with the first connecting seat.
[0008] Preferably, the second screening plate is fixedly connected with a second connecting shaft on two sides away from the first screening plate, and the second connecting shaft is rotationally connected with a first connecting plate, and the first connecting plate is fixedly connected with the inner wall of the screening box.
[0009] Preferably, the transmission mechanism comprises a third connecting shaft fixedly connected to the top surface of the second collecting plate, the top surface of the third connecting shaft is fixedly connected with a fourth connecting shaft, the top surface of the fourth connecting shaft is fixedly connected with a fifth connecting shaft symmetrically on both sides, the top surface of the fifth connecting shaft is fixedly connected with an abutting seat, and the abutting seat abuts against the bottom surface of the second screening plate.
[0010] Preferably, one side of the second collecting plate close to the second collecting port is rotationally connected with the inner wall of the screening box through a sixth connecting shaft, and the second driving mechanism comprises a second motor fixedly connected to the bottom surface in the screening box, the output shaft of the second motor is fixedly connected with an eccentric wheel, and the eccentric wheel abuts against the bottom surface of the second collecting plate.
[0011] Preferably, the first collecting plate and the third collecting plate are fixedly connected with the inner wall of the screening box, respectively.
[0012] Preferably, the length of the second collecting plate is greater than the length of the second screening plate.
[0013] Preferably, the first collecting plate is arranged to be inclined towards the first collecting port, and the third collecting plate is arranged to be inclined towards the third collecting port.
[0014] Preferably, the first collecting port is located below the feeding port, the first collecting port and the third collecting port are located on the same side of the screening box, and the third collecting port is located below the first collecting port.
[0015] The application discloses the following technical effects: the screening box receives the Chinese chestnut fruits through the feeding port, the material first falls on the first screening plate, the first driving mechanism drives the first screening plate to move transversely, so that the fruit particles with smaller sizes pass through the screen holes and fall into the first collecting plate and are discharged through the first collecting port; the fruits that do not pass through move along the surface of the first screening plate to the second screening plate, the second screening plate is driven by the transmission mechanism to vibrate at different frequencies or amplitudes, so that the fruits with medium sizes are further separated, fall into the second collecting plate and are discharged through the second collecting port; and the remaining larger fruits or impurities enter the third collecting plate and are discharged through the third collecting port. The application realizes the grading screening of the Chinese chestnut fruits through multi-stage screening, the screening plates at different levels are independently controlled, the separation requirements of different particle sizes are met, and the screening efficiency and precision are improved. BRIEF DESCRIPTION OF DRAWINGS
[0016] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application and its description are explained to present the application in an appropriate context. In the drawings:
[0017] Fig. 1 The application is a schematic diagram of the cone chestnut fruit screening device;
[0018] Fig. 2 The application is a schematic diagram of the cone chestnut fruit screening device from another angle;
[0019] Fig. 3 The application is a schematic diagram of the internal structure of the screening box;
[0020] Fig. 4 The application is a schematic diagram of the internal structure of the screening box;
[0021] In the figure: 1, screening box; 2, feed inlet; 3, first screening plate; 4, first collection plate; 5, second screening plate; 6, second collection plate; 7, third collection plate; 8, first collection port; 9, second collection port; 10, third collection port; 11, first through hole; 12, first connecting shaft; 13, first connecting seat; 14, first spring; 15, first motor; 16, cam; 17, second connecting shaft; 18, first connecting plate; 19, third connecting shaft; 20, fourth connecting shaft; 21, fifth connecting shaft; 22, abutment seat; 23, second motor; 24, eccentric wheel. DETAILED DESCRIPTION
[0022] Cone chestnut fruit is an important product of China's traditional economic forest industry. The grading and screening of harvested cone chestnut fruit is a key link to ensure the quality of commercial products. The evolution of screening devices is closely related to the process of agricultural mechanization. From the early manual screening to modern automated equipment, technological innovation has always focused on improving screening efficiency, reducing loss rate, and adapting to the characteristics of fruit.
[0023] During the stage when agricultural mechanization had not yet been widely popularized, cone chestnut fruit screening mainly relied on manual experience and simple tools. Traditional methods often used a dustpan vibrating screen, which generated an inertial force by manually shaking the dustpan, causing the fruit to stratify on the screen surface. Smaller or damaged fruits fell through the screen holes, and larger fruits remained on the screen surface. Although this method is low-cost, it is inefficient and the screening accuracy is limited by the operator's experience.
[0024] With the increasing demand for agricultural refinement, early mechanical screening devices began to incorporate the principle of vibration. Such devices are typically composed of a frame, an elastically supported mounting rack, and multiple layers of screen mesh. Vibration is generated by an eccentric wheel driven by a motor, causing the material to produce a throwing motion on the screen surface, achieving classification by particle size. Although this design can initially meet the screening needs, it has problems such as screen clogging and unstable screening efficiency. Especially for cone chestnut fruit, which is irregular in shape and easily damaged, the adaptability of traditional vibrating screens is poor.
[0025] To address the limitations of early devices, technicians began to make targeted improvements based on the physical characteristics of Castanea henryi fruits. The fruits are conical in shape, with hard shells that are prone to cracking under mechanical action. Screening devices need to ensure screening efficiency while avoiding mechanical damage to the fruits.
[0026] A typical improvement scheme uses a multi-layer screen mesh nesting structure, with screen hole sizes decreasing layer by layer. Through vibration, the material is separated step by step. Such devices optimize screen mesh material and screen hole shape to reduce shell jamming, while introducing a detachable screen plate design to facilitate adjustments to screening parameters for different varieties of Castanea henryi fruits. In addition, some devices begin to introduce airflow-assisted screening technology, using wind power to separate light impurities from fruits, further improving screening accuracy.
[0027] In terms of transmission mechanism design, early devices mostly use single motor drive mode, which is prone to lateral vibration, resulting in insufficient equipment stability. Subsequent improvement schemes introduce a dual-motor synchronous system, which eliminates lateral torque through phase adjustment, significantly improving the stability of device operation. Such technology optimization enables mechanical screening devices to achieve a preliminary balance between efficiency and stability.
[0028] With the advancement of sensor technology and control theory, Castanea henryi fruit screening devices have begun to evolve towards automation and intelligence. Modern devices integrate visual recognition systems and weight grading modules to simultaneously detect the appearance and internal quality of fruits. For example, some devices use high-speed cameras to capture fruit images, identify defects such as shell cracks and mold through image processing algorithms, and grade fruits in combination with weight sensors.
[0029] In terms of transmission control, the application of hydraulic drive and electric telescopic mechanisms makes the opening and closing of screening components more precise. Through program control, screening components can automatically adjust the distance according to the size of the fruit, avoiding damage caused by excessive compression. In addition, some devices introduce a closed-loop control system to monitor screen load and vibration frequency in real time, dynamically adjusting device operating parameters to ensure the stability of screening efficiency.
[0030] The integration of cleaning and drying functions is another important technological breakthrough. Some devices incorporate a spraying system during the screening process, using high-pressure water flow to wash the surface of the fruits, while using a hot air drying module to remove residual moisture, reducing the risk of contamination in subsequent processing steps. Such design not only improves screening efficiency, but also expands the functional boundaries of the device.
[0031] Despite the significant advancements in the technology of Chinese chestnut fruit screening devices, several challenges remain. Firstly, there is a wide variety of Chinese chestnut varieties, with significant differences in size and shape between different varieties. The adaptability of existing devices still needs to be enhanced. Secondly, the control of fruit damage rate during the screening process still needs to be optimized, especially for fragile varieties, where mechanical stress needs to be further reduced. Thirdly, the integration of intelligent technology is costly, limiting its popularity among small-scale growers.
[0032] Future technological developments may focus on the following directions: one is modular design, through the rapid replacement of standardized components, to improve the adaptability of the device to multiple varieties of fruit; two is the innovation of material science, to develop more wear-resistant and anti-clogging screen materials; three is the deep application of artificial intelligence technology, such as optimizing screening parameters through deep learning algorithms to achieve truly adaptive screening.
[0033] The technical evolution of Chinese chestnut fruit screening devices embodies the typical characteristics of the integration of agricultural mechanization and intelligence. From early manual screening to modern automated equipment, technological innovation has always focused on improving efficiency, reducing losses, and ensuring quality. Although current challenges such as adaptability, cost, and damage control remain, with further breakthroughs in material science, control theory, and artificial intelligence technology, Chinese chestnut fruit screening devices are expected to achieve new breakthroughs in precision, efficiency, and intelligence, providing strong support for the high-quality development of the Chinese chestnut industry.
[0034] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.
[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail in combination with the drawings and specific embodiments.
[0036] Reference Figs. 1 to 4As shown, the embodiment provides a Chinese chestnut fruit screening device, which comprises a screening box 1, the screening box 1 is provided with a feeding port 2 on one side, a first screening plate 3 is arranged on the side close to the feeding port 2 in the screening box 1, a first driving mechanism is arranged on the side surface of the first screening plate 3, the first driving mechanism is in transmission connection with the first screening plate 3, a first collecting plate 4 is arranged below the first screening plate 3, a second screening plate 5 is rotatably connected to the lower side of the first collecting plate 4 away from the first screening plate 3, a second collecting plate 6 is in transmission connection with the second screening plate 5 through a transmission mechanism, a second driving mechanism is arranged on the bottom of the second collecting plate 6, a third collecting plate 7 is arranged between the second screening plate 5 and the second collecting plate 6, the third collecting plate 7 is located below the first collecting plate 4, the first collecting plate 4 is in communication with a first collecting port 8, the second collecting plate 6 is in communication with a second collecting port 9, and the third collecting plate 7 is in communication with a third collecting port 10.
[0037] The screening box 1 receives Chinese chestnut fruits through the feeding port 2, the material first falls on the first screening plate 3, the first driving mechanism drives the first screening plate 3 to move transversely, so that the fruit particles with smaller sizes pass through the screen holes and fall into the first collecting plate 4 and are discharged through the first collecting port 8; the fruits that do not pass through move along the surface of the first screening plate 3 to the second screening plate 5, the second screening plate 5 is vibrated at different frequencies or amplitudes under the driving of the transmission mechanism, so that the fruits with medium sizes are further separated, fall into the second collecting plate 6 and are discharged through the second collecting port 9; the remaining larger fruits or impurities enter the third collecting plate 7 and are discharged through the third collecting port 10. The present application realizes the grading screening of Chinese chestnut fruits through multi-stage screening, the screening plates at each level are independently controlled, the separation requirements of different particle sizes are met, and the screening efficiency and precision are improved.
[0038] Further optimization scheme, the two sides of the first screening plate 3 are respectively and symmetrically provided with first through holes 11, first connecting shafts 12 are slidably connected in the first through holes 11, the first connecting shafts 12 are fixedly connected with the inner wall of the screening box 1, a first connecting seat 13 is fixedly connected to one side of the first screening plate 3, the first connecting seat 13 is in transmission connection with the first driving mechanism, and a first spring 14 is arranged outside the first connecting shaft 12 away from the first driving mechanism.
[0039] The first screening plate 3 is slidably connected with the first connecting shaft 12 through the two first through holes 11, and the first connecting shaft 12 is fixed to the inner wall of the screening box 1. The first driving mechanism pushes the first connecting seat 13, so that the first screening plate 3 reciprocates along the first connecting shaft 12, the first spring 14 provides buffering at the end of movement, and mechanical impact is reduced. The combination of the sliding connection and the buffering of the first spring 14 ensures that the first screening plate 3 moves stably, reduces the mechanical damage of the fruits in the screening process, and prolongs the service life of the equipment.
[0040] Further optimization scheme, the first driving mechanism comprises a first motor 15 fixedly connected with the inner wall of the screening box 1, an output shaft of the first motor 15 is fixedly connected with a cam 16, and the cam 16 abuts against the first connecting seat 13.
[0041] The first motor 15 drives the cam 16 to rotate, which periodically pushes the first connecting seat 13 to drive the first screening plate 3 to vibrate intermittently, so that the fruits form a throwing motion and promote stratified screening. The cam 16 mechanism realizes non-uniform vibration, simulates the throwing action of manual screening, enhances the screening efficiency, and at the same time avoids the overload of the screen caused by continuous vibration.
[0042] Further optimization scheme, the second screening plate 5 is fixedly connected with the second connecting shaft 17 away from the two sides of the first screening plate 3, the second connecting shaft 17 is rotationally connected with the first connecting plate 18, and the first connecting plate 18 is fixedly connected with the inner wall of the screening box 1.
[0043] The second screening plate 5 is rotationally connected with the first connecting plate 18 through the second connecting shaft 17, and the first connecting plate 18 is fixed to the inner wall of the screening box 1. When the second collecting plate 6 moves under the drive of the transmission mechanism, the second screening plate 5 changes the angle due to gravity or transmission reaction force, and adjusts the inclination of the screen surface. The rotationally connected design enables the second screening plate 5 to automatically adjust the angle according to the load, optimizes the fruit flow path, reduces the risk of blockage, and improves the smoothness of screening.
[0044] Further optimization scheme, the transmission mechanism includes a third connecting shaft 19 fixedly connected to the top surface of the second collecting plate 6, a fourth connecting shaft 20 fixedly connected to the top surface of the third connecting shaft 19, a fifth connecting shaft 21 fixedly connected to the top surface of the fourth connecting shaft 20, a fifth connecting shaft 21 fixedly connected to the top surface of the fourth connecting shaft 20, and a fifth connecting shaft 21 fixedly connected to the top surface of the fourth connecting shaft 20. The top surface of the fifth connecting shaft 21 is fixedly connected with the abutting seat 22, and the abutting seat 22 abuts with the bottom surface of the second screening plate 5.
[0045] The second collecting plate 6 is connected with the fourth connecting shaft 20 through the third connecting shaft 19, and the fifth connecting shaft 21 fixes the abutting seat 22 to the top end of the fourth connecting shaft 20. When the second collecting plate 6 vibrates, the abutting seat 22 contacts with the bottom surface of the second screening plate 5, and the movement is transmitted to the second screening plate 5 through multiple connecting shafts to form a linkage effect. The transmission mechanism realizes the cooperative movement of the second collecting plate 6 and the second screening plate 5, drives the screening plate by using the vibration energy of the second collecting plate 6, reduces the energy consumption, and at the same time maintains the synchronization of the screening action.
[0046] Further optimization scheme, one side of the second collecting plate 6 close to the second collecting port 9 is rotationally connected with the inner wall of the screening box 1 through the sixth connecting shaft, and the second driving mechanism includes a second motor 23 fixedly connected to the bottom surface of the screening box 1, an eccentric wheel 24 fixedly connected to the output shaft of the second motor 23, and the bottom surface of the second collecting plate 6.
[0047] The second collecting plate 6 is rotationally connected with the inner wall of the screening box 1 through a sixth connecting shaft, the second motor 23 drives an eccentric wheel 24 to rotate, the eccentric wheel 24 periodically pushes the bottom surface of the second collecting plate 6, so that the second collecting plate 6 generates reciprocating swing around the sixth connecting shaft. The eccentric wheel 24 driving structure provides a stable and controllable vibration source, the swing movement of the second collecting plate 6 promotes the fruits to gather to the collecting port, and meanwhile, the second screening plate 5 is driven to move through the transmission mechanism, so that energy is efficiently utilized.
[0048] Further optimization scheme, the first collecting plate 4 and the third collecting plate 7 are respectively fixedly connected with the inner wall of the screening box 1. The first collecting plate 4 and the third collecting plate 7 are fixed to the inner wall of the screening box 1 to form a static flow guide channel, so as to ensure that the fruits falling from the first screening plate 3 and the second screening plate 5 accurately enter the corresponding collecting port. The fixed collecting plate avoids material backflow or mixing caused by vibration, guarantees the independence of the screening results of each level, and improves the classification accuracy.
[0049] Further optimization scheme, the length of the second collecting plate 6 is greater than the length of the second screening plate 5.
[0050] When the fruits screened by the second screening plate 5 fall to the second collecting plate 6, the longer plate body can intercept the fine impurities that may be mixed, so that the fine impurities are discharged through the third collecting plate 7. The length difference design forms a secondary screening effect, the second collecting plate 6 has the functions of collecting and auxiliary screening, further separates the impurities, and improves the purity of the finished product.
[0051] Further optimization scheme, the first collecting plate 4 is obliquely arranged towards the first collecting port 8, and the third collecting plate 7 is obliquely arranged towards the third collecting port 10. The first collecting plate 4 and the third collecting plate 7 are obliquely arranged, so that the fruits automatically slide to the collecting port by gravity, and the demand for mechanical conveying is reduced.
[0052] Further optimization scheme, the first collecting port 8 is located below the feeding port 2, the first collecting port 8 and the third collecting port 10 are located on the same side of the screening box 1, and the third collecting port 10 is located below the first collecting port 8. The layout of the discharge ports optimizes the space utilization rate, the three products do not interfere with each other, are convenient for subsequent packaging or processing, and meet the convenience requirement of operation at the same time.
[0053] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0054] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.
Claims
1. A chestnut screening device, characterized in that: The invention comprises a screening box (1), wherein a feed port (2) is provided on one side of the screening box (1), a first screening plate (3) is provided on one side of the screening box (1) near the feed port (2), a first driving mechanism is provided on the side of the first screening plate (3), the first driving mechanism is transmission-connected to the first screening plate (3), a first collecting plate (4) is provided below the first screening plate (3), the first collecting plate (4) is rotationally connected to a second screening plate (5) away from the bottom of the first screening plate (3), a second collecting plate (6) is transmission-connected to the bottom of the second screening plate (5) through a transmission mechanism, a second driving mechanism is provided at the bottom of the second collecting plate (6), a third collecting plate (7) is provided between the second screening plate (5) and the second collecting plate (6), the third collecting plate (7) is located below the first collecting plate (4), the first collecting plate (4) is connected to a first collecting port (8), the second collecting plate (6) is connected to a second collecting port (9), and the third collecting plate (7) is connected to a third collecting port (10).
2. The chestnut screening device according to claim 1, characterized in that: First through holes (11) are symmetrically provided on both sides of the first screening plate (3), a first connecting shaft (12) is slidably connected in the first through hole (11), the first connecting shaft (12) is fixedly connected to the inner wall of the screening box (1), a first connecting seat (13) is fixedly connected to one side of the first screening plate (3), the first connecting seat (13) is transmission-connected to the first driving mechanism, and a first spring (14) is provided outside the first connecting shaft (12) away from the first driving mechanism.
3. The chestnut screening device according to claim 2, wherein: The first driving mechanism comprises a first motor (15) fixedly connected to the inner wall of the screening box (1); an output shaft of the first motor (15) is fixedly connected to a cam (16); and the cam (16) abuts against the first connecting seat (13).
4. The chestnut screening device according to claim 1, wherein: The second screening plate (5) is fixedly connected to a second connecting shaft (17) on both sides away from the first screening plate (3). The second connecting shaft (17) is rotatably connected to a first connecting plate (18). The first connecting plate (18) is fixedly connected to the inner wall of the screening box (1).
5. The chestnut screening device according to claim 1, characterized in that: The transmission mechanism includes a third connecting shaft (19) fixedly connected to the top surface of the second collecting plate (6), the top surface of the third connecting shaft (19) is fixedly connected to a fourth connecting shaft (20), the top surface of the fourth connecting shaft (20) is symmetrically fixedly connected to a fifth connecting shaft (21), the top surface of the fifth connecting shaft (21) is fixedly connected to an abutment seat (22), and the abutment seat (22) abuts against the bottom surface of the second screening plate (5).
6. The chestnut screening device according to claim 1, characterized in that: The side of the second collecting plate (6) close to the second collecting port (9) is rotatably connected to the inner wall of the screening box (1) via a sixth connecting shaft. The second driving mechanism comprises a second motor (23) fixed to the inner bottom surface of the screening box (1). The output shaft of the second motor (23) is fixed to an eccentric wheel (24), and the eccentric wheel (24) abuts against the bottom surface of the second collecting plate (6).
7. The chestnut screening device according to claim 1, characterized in that: The first collecting plate (4) and the third collecting plate (7) are respectively fixed to the inner wall of the screening box (1).
8. The chestnut screening device according to claim 1, characterized in that: The length of the second collecting plate (6) is greater than the length of the second screening plate (5).
9. The chestnut screening device according to claim 1, wherein: The first collecting plate (4) is arranged to be inclined toward the first collecting port (8), and the third collecting plate (7) is arranged to be inclined toward the third collecting port (10).
10. The chestnut screening device according to claim 1, characterized in that: The first collecting port (8) is located below the feed port (2), the first collecting port (8) and the third collecting port (10) are located on the same side of the screening box (1), and the third collecting port (10) is located below the first collecting port (8).