Multi-stage macadamia nut classifying screen capable of automatically feeding
The multi-stage grading screen for macadamia nuts with automatic feeding utilizes a motor-driven multi-stage screening cylinder and a frustum-shaped inclined surface design to achieve step-by-step screening and precise grading of macadamia nuts. This solves the problems of low grading efficiency and poor accuracy in existing technologies, and improves grading efficiency and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG GUOYUAN AGRICULTURAL TECHNOLOGY CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-19
AI Technical Summary
In existing macadamia nut grading technologies, fixed screens or simple vibrations result in uneven fruit distribution and difficulty in precisely controlling the moving speed, leading to low grading efficiency and poor accuracy, often resulting in confusion between fruits of different sizes.
The macadamia nut multi-stage grading screen uses an automatic feeding system. It drives the multi-stage screening cylinder to rotate using a motor, shaft, and chain transmission mechanism. Combined with the frustum-shaped inclined surface design of the screening cylinder and the progressively smaller screening apertures, it achieves progressive separation and precise screening of the nuts. The nuts are then graded, filtered, and transported through guide plates and multi-stage conveyor plates.
It improves screening efficiency and grading accuracy, meeting the high-quality and high-efficiency requirements of industrial production and ensuring accurate classification of fruits of different sizes.
Smart Images
Figure CN224253417U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of macadamia nut screening technology, and in particular to an automatic feeding multi-stage grading screen for macadamia nuts. Background Technology
[0002] In the macadamia nut processing industry, efficient and precise grading and sorting play a crucial role in improving product quality, increasing production efficiency, and reducing costs. With the continuous growth in market demand for macadamia nuts, traditional manual grading methods are no longer sufficient to meet the requirements of large-scale production. Developing an automated, multi-stage grading screen for macadamia nuts has become an urgent need for the industry. This system can achieve automated operation and precise grading, which is of great significance for promoting the modernization of the macadamia nut processing industry.
[0003] In existing macadamia nut grading technologies, some methods employ simple fixed screen structures, relying on manual dumping of the macadamia nuts onto the screen, allowing them to fall naturally through the screen for grading. Other devices use vibrating motors to generate vibrations, causing a single-layer screen to shake, moving the macadamia nuts across the screen for grading. These methods are based on relatively basic principles and have simpler mechanical structures.
[0004] Existing technologies, due to fixed screens or reliance on simple vibration, result in uneven distribution of macadamia nuts on the screens and difficulty in precisely controlling their movement speed. This leads to a large number of nuts failing to pass accurately through screens with corresponding aperture sizes, resulting in low grading efficiency and poor accuracy, often causing mixing of nuts of different sizes. This not only wastes manpower and time but also reduces product quality, making it difficult to gain a competitive edge in the market. There is an urgent need for a new technology that can achieve automated, efficient, and precise grading to solve these problems. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides an automatic feeding multi-stage grading sieve for macadamia nuts, aiming to improve the existing technology where, due to fixed sieves or simple vibration, the distribution of macadamia nuts on the sieve is uneven and the moving speed is difficult to control precisely. This results in a large number of nuts failing to pass accurately through the sieve with the corresponding aperture, leading to low grading efficiency and poor grading accuracy, often resulting in the mixing of nuts of different sizes.
[0006] To achieve the above objectives, this utility model provides the following technical solution: an automatic feeding multi-stage grading screen for macadamia nuts, comprising a fixed support, a screening chamber fixedly connected to the upper surface of the fixed support, a multi-stage screening cylinder rotatably connected to the inner wall of the screening chamber, a guide plate fixedly connected to the bottom of the screening chamber, a limit ring fixedly connected to the outer wall of the multi-stage screening cylinder, a roller support fixedly connected to the inner wall of the screening chamber, an auxiliary wheel rotatably connected to the inside of the roller support, a pressure roller rotatably connected to the top of the screening chamber, multiple belts fixedly connected to the inner wall of the multi-stage screening cylinder, and a drive assembly provided at the bottom of the screening chamber;
[0007] The drive assembly includes a motor, a rotating shaft, and a chain drive mechanism. The outer wall of the motor is fixedly connected to the bottom of the fixed bracket. One end of the rotating shaft is fixedly connected to the output end of the motor. One end of the chain drive mechanism is disposed on the outer wall of the rotating shaft. The other end of the chain drive mechanism is provided with a rotating rod. A bearing seat is fixedly connected to the outer wall of the rotating rod. A protective plate is provided on the outer wall of the chain drive mechanism.
[0008] Furthermore, the outer wall of the screening chamber is fixedly connected with multiple multi-stage conveying plates, and one end of the screening chamber is fixedly connected with a feeding bin.
[0009] Furthermore, a conveyor belt support is provided on one side of the outer wall of the fixed bracket, the top of the conveyor belt support is fixedly connected to the conveyor belt body, and a hopper is provided at one end of the conveyor belt body.
[0010] Furthermore, a primary conveying plate is fixedly connected to one end of the screening chamber, and a feeding plate is provided at one end of the primary conveying plate.
[0011] Furthermore, the primary conveying plate is located below the hopper, and the inner wall of the primary conveying plate is designed with a 30° inclination. The primary conveying plate is used to convey macadamia nuts.
[0012] Furthermore, the auxiliary wheels are disposed on both sides of the outer wall of the limiting ring, and the auxiliary wheels are used to support the limiting ring and the multi-stage screening cylinder.
[0013] Furthermore, the multi-stage screening cylinder is arranged in a frustum shape, with a smaller diameter at the end near the feeding bin and a larger diameter at the end near the chain drive mechanism. The screening holes inside the multi-stage screening cylinder have a gradually increasing diameter from the end near the feeding bin to the end near the chain drive mechanism.
[0014] Furthermore, the guide plate is disposed below the multi-stage screening cylinder, and multiple multi-stage conveying plates are disposed at the opening of the guide plate. The guide plate and the inner wall of the multi-stage screening cylinder are both designed to be inclined at 30°.
[0015] This utility model has the following beneficial effects:
[0016] 1. In this utility model, the ingenious cooperation of the motor, rotating shaft, chain transmission mechanism and rotating rod in the screening process drives the multi-stage screening cylinder to rotate, achieving precise screening of macadamia nuts. The frustum-shaped inclined design of the multi-stage screening cylinder allows the macadamia nuts to move automatically to one end and be screened step by step. Fruits of different sizes fall into the corresponding guide plates, and are then conveyed by the inclined guide plates to the multi-stage conveying plates for grading and filtration, which greatly improves screening efficiency and grading accuracy, effectively meeting the high-quality and high-efficiency requirements of industrial production for macadamia nut grading. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural diagram of a multi-stage grading sieve for automatic feeding of macadamia nuts proposed in this utility model.
[0018] Figure 2 This is a schematic diagram of the internal structure of the screening chamber of a multi-stage grading screen for automatic feeding of macadamia nuts proposed in this utility model.
[0019] Figure 3 This is a schematic diagram of one side of the protective plate structure of an automatic feeding macadamia nut multi-stage grading sieve proposed in this utility model.
[0020] Figure 4 This is a schematic diagram of the internal structure of the feeding bin of a multi-stage grading screen for automatic feeding of macadamia nuts proposed in this utility model.
[0021] Figure 5 This is a schematic diagram of the internal structure of the multi-stage screening cylinder of an automatic feeding macadamia nut multi-stage grading screen proposed in this utility model.
[0022] Legend:
[0023] 1. Fixed support; 2. Screening bin; 3. Guide plate; 4. Multi-stage screening cylinder; 5. Multi-stage conveyor plate; 6. Roller support; 7. Auxiliary wheel; 8. Limiting ring; 9. Motor; 10. Rotating rod; 11. Chain drive mechanism; 12. Protective plate; 13. Bearing seat; 14. Rotating shaft; 15. Feeding bin; 16. Conveyor belt support; 17. Conveyor belt body; 18. Discharge hopper; 19. Primary conveyor plate; 20. Pressure roller; 21. Webbing belt; 22. Feeding plate. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] Reference Figure 1 - Figure 4 This utility model provides an embodiment of an automatic feeding multi-stage grading screen for macadamia nuts, including a fixed support 1. A screening chamber 2 is fixedly connected to the upper surface of the fixed support 1. A multi-stage screening cylinder 4 is rotatably connected to the inner wall of the screening chamber 2. Through rotation and its frustum-shaped inclined surface design, as well as the screens with different apertures arranged in a stepped manner on the cylinder wall, the macadamia nuts are screened step by step, allowing macadamia nuts of different sizes to be separated. A guide plate 3 is fixedly connected to the bottom of the screening chamber 2 to receive the feed from the multi-stage screening cylinder. Macadamia nuts of different sizes falling from the screen are guided into the multi-stage conveyor plate 5 by the inclined surface inside the screen, which plays a role in transition and guiding the conveying. The outer wall of the multi-stage screening cylinder 4 is fixedly connected to the limit ring 8. The inner wall of the screening chamber 2 is fixedly connected to the roller support 6. The roller support 6 is rotatably connected to the inside of the roller support 6. The top of the screening chamber 2 is rotatably connected to the pressure roller 20. The inner wall of the multi-stage screening cylinder 4 is fixedly connected to multiple belts 21. The bottom of the screening chamber 2 is provided with a drive assembly.
[0026] The drive assembly includes a motor 9, which, after starting, drives the rotating rod 10 to rotate via a rotating shaft 14 and a chain drive mechanism 11, providing power for the rotation of the multi-stage screening cylinder 4 and enabling the screening process to continue. The rotating shaft 14 and the chain drive mechanism 11 transmit the power of the motor 9 to the chain drive mechanism 11, driving the connected components to rotate. The outer wall of the motor 9 is fixedly connected to the bottom of the fixed bracket 1. One end of the rotating shaft 14 is fixedly connected to the output end of the motor 9. One end of the chain drive mechanism 11 is located on the outer wall of the rotating shaft 14, and the other end of the chain drive mechanism 11 is provided with a rotating rod 10, which is evenly distributed around the outer periphery of the multi-stage screening cylinder 4 and rigidly connected to it. Under the drive of the chain drive mechanism 11, the rotating rod 10 rotates, thereby driving the multi-stage screening cylinder 4 to rotate around its central axis. It is the direct drive component for realizing the rotation of the multi-stage screening cylinder 4. The outer wall of the rotating rod 10 is fixedly connected with a bearing seat 13, and the outer wall of the chain drive mechanism 11 is provided with a protective plate 12.
[0027] Specifically, the pre-treated macadamia nuts are precisely conveyed to the top of the multi-stage screening cylinder 4 via a conveying system. The control system starts the motor 9, whose power output shaft is connected to the rotating shaft 14 via a high-precision coupling, causing the rotating shaft 14 to rotate at high speed. The sprocket on the rotating shaft 14 meshes with the chain drive mechanism 11, transmitting power to the sprocket at one end of the rotating rod 10, driving the rotating rod 10 to rotate, which in turn drives the multi-stage screening cylinder 4 to rotate at a constant speed around its central axis. The multi-stage screening cylinder 4 is frustum-shaped, and the angle between its generatrix and the axis is optimized to guide the macadamia nuts within the cylinder. The macadamia nuts move towards the end closest to the chain drive mechanism 11, relying on gravity and the action of the inclined plane. The cylinder wall is made of stainless steel and has screens with sieves arranged in a stepped manner with increasing aperture. During the movement, the macadamia nuts fall from the corresponding screens according to their size and land on the guide plate 3 at the preset position. The guide plate 3 is made of galvanized steel plate and the inclined design allows the macadamia nuts to slide to the multi-stage conveyor plate 5. The multi-stage conveyor plate 5 has a multi-layer stainless steel wire filter structure with customized mesh, which further filters the macadamia nuts to ensure that they meet the specifications and standards, providing a guarantee for subsequent processing and sales.
[0028] Reference Figure 1 and Figure 5 Multiple multi-stage conveyor plates 5 are fixedly connected to the outer wall of the screening chamber 2. These plates receive the graded macadamia nuts from the guide plate 3, further completing the grading and filtration conveying process to achieve the final classification and output of the macadamia nuts. A feeding bin 15 is fixedly connected to one end of the screening chamber 2. A conveyor belt support 16 is installed on one side of the outer wall of the fixed support 1. The top of the conveyor belt support 16 is fixedly connected to the conveyor belt body 17. A discharge hopper 18 is installed at one end of the conveyor belt body 17. A primary conveyor plate 19 is fixedly connected inside the screening chamber 2. Its inner wall has a 30° slope, which, with the help of gravity, pushes the macadamia nuts to the other end, providing the moving power for the filtration stage. A feeding plate 22 is installed inside the primary conveyor plate 19 to further convey and primary transport the macadamia nuts. The feeding plate 19 is located below the hopper 18. The inner wall of the primary conveying plate 19 is designed with a 30° inclination. The primary conveying plate 19 is used to convey macadamia nuts. The auxiliary wheels 7 are located on both sides of the outer wall of the limiting ring 8. The auxiliary wheels 7 are used to support the limiting ring 8 and the multi-stage screening cylinder 4. The multi-stage screening cylinder 4 is set in a frustum shape. The diameter is smaller at the end near the feeding bin 15 and larger at the end near the chain drive mechanism 11. The screening holes inside the multi-stage screening cylinder 4 have a gradually increasing diameter from the end near the feeding bin 15 to the end near the chain drive mechanism 11. The guide plate 3 is located below the multi-stage screening cylinder 4. Multiple multi-stage conveying plates 5 are located at the opening of the guide plate 3. The guide plate 3 and the inner wall of the multi-stage screening cylinder 4 are both designed with a 30° inclination.
[0029] Specifically, the conveyor belt body 17 operates first. Its surface is specially treated to prevent macadamia nuts from slipping and conveys the nuts to the hopper 18 at a uniform speed. The unique funnel shape of the hopper 18 allows the nuts to slide smoothly to the primary conveyor plate 19. The 30° inclined surface of the primary conveyor plate 19 uses gravity to convey the macadamia nuts to the other end. Finally, the macadamia nuts are conveyed to the multi-stage screening cylinder 4 through the feeding plate 22.
[0030] Working principle: When the macadamia nut multi-stage grading screen is needed, the macadamia nuts are first conveyed to the top of the hopper 18 by the conveyor belt body 17, and then the macadamia nuts are sent to the top of the primary conveyor plate 19 by the hopper 18. The macadamia nuts are conveyed to the other end by the 30° inclined surface of the inner wall of the primary conveyor plate 19. During this process, the macadamia nuts will pass through the feeding plate 22 and be conveyed into the multi-stage screening cylinder 4 by the feeding plate 22.
[0031] In addition, the pre-treated macadamia nuts are conveyed to the top of the multi-stage screening cylinder 4. With the help of the belt 21 inside the multi-stage screening cylinder 4, the macadamia nuts continue to be conveyed forward. Then, the motor 9 is started and the rotating shaft 14 drives the chain transmission mechanism 11 to run, thereby driving the rotating rod 10 to rotate. The rotating rod 10 then rotates the multi-stage screening cylinder 4 to screen the macadamia nuts. During this process, the truncated cone-shaped inclined surface of the multi-stage screening cylinder 4 allows the macadamia nuts to move towards the end close to the chain transmission mechanism 11 for step-by-step screening. This causes macadamia nuts of different sizes to fall into the interior of the pre-set guide plate 3. The pressure roller 20 can also squeeze the macadamia nuts stuck in the filter holes of the multi-stage screening cylinder 4 into the interior of the multi-stage screening cylinder 4 to avoid blockage. Then, the inclined surface inside the guide plate 3 sends the macadamia nuts into the interior of the multi-stage conveyor plate 5 for graded filtration and conveying.
[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An automatic feeding multi-stage grading sieve for macadamia nuts, comprising a fixed support (1), characterized in that: The upper surface of the fixed support (1) is fixedly connected to a screening chamber (2), the inner wall of the screening chamber (2) is rotatably connected to a multi-stage screening cylinder (4), the bottom of the screening chamber (2) is fixedly connected to a guide plate (3), the outer wall of the multi-stage screening cylinder (4) is fixedly connected to a limit ring (8), the inner wall of the screening chamber (2) is fixedly connected to a roller support (6), the inside of the roller support (6) is rotatably connected to an auxiliary wheel (7), the top of the screening chamber (2) is rotatably connected to a pressure roller (20), the inner wall of the multi-stage screening cylinder (4) is fixedly connected to multiple belts (21), and the bottom of the screening chamber (2) is provided with a drive assembly. The drive assembly includes a motor (9), a rotating shaft (14), and a chain drive mechanism (11). The outer wall of the motor (9) is fixedly connected to the bottom of the fixed bracket (1). One end of the rotating shaft (14) is fixedly connected to the output end of the motor (9). One end of the chain drive mechanism (11) is disposed on the outer wall of the rotating shaft (14). The other end of the chain drive mechanism (11) is provided with a rotating rod (10). The outer wall of the rotating rod (10) is fixedly connected with a bearing seat (13). The outer wall of the chain drive mechanism (11) is provided with a protective plate (12).
2. The automatic feeding multi-stage grading sieve for macadamia nuts according to claim 1, characterized in that: The outer wall of the screening chamber (2) is fixedly connected with multiple multi-stage conveying plates (5), and one end of the screening chamber (2) is fixedly connected with a feeding chamber (15).
3. The automatic feeding multi-stage grading sieve for macadamia nuts according to claim 2, characterized in that: A conveyor belt support (16) is provided on one side of the outer wall of the fixed support (1), and the top of the conveyor belt support (16) is fixedly connected to the conveyor belt body (17). A hopper (18) is provided at one end of the conveyor belt body (17).
4. The automatic feeding multi-stage grading sieve for macadamia nuts according to claim 3, characterized in that: One end of the screening chamber (2) is fixedly connected to a primary conveying plate (19), and one end of the primary conveying plate (19) is provided with a feeding plate (22).
5. The automatic feeding multi-stage grading sieve for macadamia nuts according to claim 4, characterized in that: The primary conveying plate (19) is located below the hopper (18), and the inner wall of the primary conveying plate (19) is designed with a 30° inclination. The primary conveying plate (19) is used to convey macadamia nuts.
6. The automatic feeding multi-stage grading sieve for macadamia nuts according to claim 1, characterized in that: The auxiliary wheels (7) are arranged on both sides of the outer wall of the limiting ring (8), and the auxiliary wheels (7) are used to support the limiting ring (8) and the multi-stage screening cylinder (4).
7. The automatic feeding multi-stage grading screen for macadamia nuts according to claim 3, characterized in that: The multi-stage screening cylinder (4) is arranged in a frustum shape. The diameter is smaller at the end near the feeding bin (15) and larger at the end near the chain drive mechanism (11). The screening holes inside the multi-stage screening cylinder (4) gradually increase in diameter from the end near the feeding bin (15) to the end near the chain drive mechanism (11).
8. The automatic feeding multi-stage grading sieve for macadamia nuts according to claim 2, characterized in that: The guide plate (3) is located below the multi-stage screening cylinder (4), and multiple multi-stage conveying plates (5) are located at the opening of the guide plate (3). The guide plate (3) and the inner wall of the multi-stage screening cylinder (4) are both designed to be inclined at 30°.