A multi-stage air screen seed cleaner and a cleaning method

Abstract

The present application relates to a kind of multi-stage wind screen seed cleaner and cleaning method, belong to agricultural machinery technical field;The multi-stage wind screen seed cleaner includes uniform seed feeding device, multi-stage vibration screen device, sedimentation impurity removal device, grading seed outlet device, rack and power control device.The present application combines winnowing and screening two kinds of cleaning principle, integrates multi-stage vibration sorting screen and winnowing impurity removal screen, while realizing seed grading cleaning, with the function of dust impurity removal.By grading seed outlet device, different grades of seed after grading cleaning are transported to corresponding seed outlet channel, facilitating subsequent seed processing or sowing operation;It improves the cleanliness of seed before sowing, can remove poor quality seed, improve crop planting uniformity, increase crop yield.

Description

Technical Field

[0001] This invention relates to a multi-stage air-screen seed cleaner and cleaning method, belonging to the field of agricultural machinery technology. Background Technology

[0002] After harvest, seeds are often mixed with other crop seeds, weed seeds, sand, dust, and other impurities. Harvested seeds also include unripe grains, broken grains, and insect-eaten grains. External characteristics of seeds, such as size, weight, shape, and structure, often reflect their quality. To ensure seed sowing quality, seed cleaning and grading are common pre-sowing treatment methods. Seed grading optimizes seed size and weight, enabling appropriate sowing density and improving crop uniformity. Seed cleaning removes impurities, dust, pathogens, and other harmful substances from the seed surface, reducing the risk of disease transmission and protecting healthy crop growth. Furthermore, graded and cleaned seeds are easier to sow using mechanized methods, improving the efficiency of sowing equipment and reducing the possibility of blockages and malfunctions. This multi-stage air-screen seed cleaner can perform pre-sowing treatment of irregular seeds such as alfalfa, enabling real-time seed sorting and cleaning. Summary of the Invention

[0003] The purpose of this invention is to address pre-sowing issues related to alfalfa seeds and other major high-quality forage seeds by providing a multi-stage air-screen seed cleaner. This machine is fully functional, easy to operate, economical, low-cost, and highly intelligent. During processing, it exhibits excellent cleaning and grading performance with high efficiency, enabling rapid, accurate, and effective real-time uniform feeding and stable adaptation to grading and cleaning. This invention explores a highly efficient, low-loss, and environmentally friendly pre-sowing treatment method for alfalfa and other seeds that integrates agricultural machinery and agronomy, aiming to promote technological progress in the alfalfa industry, thereby meeting the needs of livestock development and ecological construction, and improving the growth and biomass yield of alfalfa and other crops throughout their entire growth cycle.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: In the first aspect, the present invention provides a multi-stage seed air sieve cleaning machine, including a uniform seed feeding device, a multi-stage vibrating sieve device, a sedimentation and impurity removal device, a graded seed output device, a frame, and a power control device.

[0005] The uniform seed feeding device is the head feeding mechanism of the multi-stage air-screen seed cleaner, including a hopper, a support base plate, a discharge baffle, a secondary vibration shaft, a small rocker arm, a secondary swing arm, a vibration rib plate, a vibration discharge plate, a spring screw, a vibration main shaft, an eccentric connecting rod, a discharge plate bracket, a main swing arm, hopper side ears, a seed guide base, an inoculation plate adjustment mechanism, an inlet sealing plate, and an inoculation plate. The seed feeding device is installed above the cleaning screen frame and the two side support frames. The hopper is fixed to the support frame with bolts, and the seed guide base is fixed to the front and rear outer walls of the cleaning screen frame with bolts. Driven by the main vibration shaft and the vibration eccentric connecting rod, the seed feeding device uniformly and stably feeds the seeds in the hopper from the seed guide base into the multi-stage vibrating screen device. The hopper side ears on the front and rear sides of the hopper and the two front and rear support frames are fixedly connected with bolts. The support base plate has a straight sliding groove at the connection point with the discharge baffle, which is connected by spring screws. Adjusting the tightness of the spring screws or their relative connection position with the straight sliding groove can adjust the distance between the discharge baffle and the discharge port at the bottom of the hopper, thereby adjusting the seed output per unit time. The small rocker arm is installed at both ends of the vibration sub-shaft and connected to the auxiliary swing arm, which plays a role in the overall vibration, support, and amplitude increase of the discharge plate. The two side vibration ribs are connected to the support base plate through the vibration sub-shaft, and their function is to provide small-amplitude excitation to the discharge baffle. The auxiliary swing arm is connected to the discharge plate bracket through a pin. The upper end of the discharge plate bracket is connected to the main swing arm through a pin to form a rotating joint, and an adjustable-angle vibrating discharge plate is installed in the middle. By changing the angle, the sliding speed of the seeds on the surface of the discharge plate is adjusted. The lower end of the main swing arm is equipped with a vibrating main arm. The vibrating main shaft is equipped with an eccentric connecting rod, which is connected to the impurity removal auger shaft via a V-belt for transmission. The other end of the eccentric connecting rod is fixedly connected to the underside of the vibrating discharge plate, which excites the entire seed feeding device to achieve uniform seed dropping. The upper end of the impurity inlet sealing plate is connected to the inner wall of the impurity inlet channel of the settling and impurity removal device, and the lower end is fitted with the inoculation plate with a gap. Due to inertia, dust and impurities mixed in the seeds falling from the vibrating discharge plate onto the inoculation plate are easily stirred up and fall off, and enter the settling and impurity removal device through the impurity inlet under the negative pressure suction in the settling chamber. The lower end of the inoculation plate is movably connected to the inoculation plate adjustment device, and the inoculation height and angle are adjusted by the extension and retraction of the electric cylinder of the adjustment device. The seed guide base is installed on the front and rear outer walls of the cleaning and screening frame, and its function is to guide the seeds sliding off the inoculation plate into the multi-stage vibrating screen device.

[0006] As a further embodiment of the present invention, the multi-stage vibrating screen device includes a debris cover, side lugs of the cleaning screen frame, a cleaning screen frame, a seed dropping screen, a cleaning screen II, a secondary cleaning screen, a cleaning screen I, a primary cleaning screen, a tertiary cleaning screen, a seed thinning scraper, and a seed guide plate. The main body of the vibrating screen device is fixedly connected to the side lugs of the cleaning screen frame to the support legs of the cleaning device mounted on the base plate of the frame by bolts. The upper part of the cleaning screen frame, near the debris cover, is connected to the seed feeding base of the uniform seed feeding device by bolts. The multi-stage vibrating screen body of the cleaning screen is installed inside the cleaning screen frame; the debris cover is installed... Mounted on the cleaning sieve frame, its function is to prevent dust and debris caused by the vibration of the seed feeding device from falling directly into the seed guide plate; the seed dropping sieve is mounted on the cleaning sieve frame, its function is to receive the seeds sliding off the seed guide base and sieve the seeds onto the seed guide plate. The seed dropping sieve has several through holes corresponding to the seed size, ensuring that the seeds fall smoothly while larger debris is discharged through the debris collection trough I installed at the end of the seed dropping sieve; the seed guide plate is fixed to the cleaning sieve frame at a certain angle, its function is to buffer the seeds falling from the seed dropping sieve and guide the seeds to the front end of the primary cleaning sieve; the first The primary cleaning sieve is drawer-shaped, with several small, irregularly shaped seed-shaped through holes arrayed on its surface. Four rows of arc-shaped hooks are fixed beneath the sieve surface, movably connected to the cleaning screen I via these hooks. The arc-shaped hooks assist in the vibration of the cleaning screen I during the primary cleaning sieve's vibration, providing a vibration-driven effect to clear blocked seeds. Multiple crossbars are welded to the top of the cleaning screen I body for flexible adjustment of its connection to the arc-shaped hooks. Below is a mesh sieve, movably connected to the cleaning sieve frame. The seed thinning scraper is installed on the bottom surface of the cleaning screen I and is fixedly connected to its frame support, dispersing and gently thinning seeds. The process involves vibrating the primary cleaning screen to remove seeds falling through it, and simultaneously clearing any accumulated or clogged seeds on the secondary cleaning screen. The secondary cleaning screen is movably connected to the cleaning screen II via arc-shaped hooks mounted on its bottom surface, and its surface is arrayed with several extremely small, irregularly shaped seed-shaped holes. The cleaning screen II is movably connected to the cleaning screen frame, with multiple crossbars welded to its top for flexible adjustment of its connection to the arc-shaped hooks, and a mesh screen below. The tertiary cleaning screen is a rectangular steel plate installed at the bottom of the cleaning screen II, fixed at a certain angle to the cleaning screen frame; its function is to screen small seeds.

[0007] As a further embodiment of the present invention, the settling and impurity removal device includes a dust outlet, a settling chamber cover, an adjusting handwheel, an air-blowing impurity inlet channel, a fan, a settling device base frame, an impurity discharge port, an impurity collecting auger shaft, a pulley, a rotating gear, an impurity inlet, a linkage rack, a guide baffle, and a settling chamber; the main body of the settling and impurity removal device is mounted on the machine frame base plate on the right side via the settling device base frame, and mounted on the cleaning screen frame above the other side via the settling chamber cover; the main body of the dust outlet is mounted above the settling device cover, and the dust outlet can be externally connected to a dust collection device; the settling device cover is mounted above the cleaning screen frame, and an inoculation plate installation port is opened on the left side of the cover to facilitate the inoculation plate to pass through and complete the installation; The settling chamber is a spatial area enclosed by a settling chamber cover, its function being to settle larger particles of dust and other debris under the action of wind force and their own weight. The air-blowing debris inlet channel is installed on the outside of the settling device and is fixedly connected to the air intake fan to form the debris air-blowing cleaning section, its function being to guide the airflow generated by the fan into the settling chamber. The guide baffle is movably connected to the settling device cover, and its installation angle can be adjusted as needed to achieve dust and smoke guidance in different directions. The adjusting handwheels are installed in pairs on the front of the settling device cover. The bottom of the linkage rack is equipped with a baffle, which is installed on the inner wall of the settling device cover and rotates with it. The gears mesh, and the rotating gear is coaxial with the rotation center of the adjusting handwheel. As the adjusting handwheel rotates, it drives the bottom baffle of the linkage rack to extend and retract, adjusting the size of the inlet and the air-blown inlet channel. The pulley is coaxial with the rotation center of the collecting auger, and its function is to provide power for the rotation of the collecting auger and to provide power for the rotation of the vibrating main shaft of the uniform seed feeding device through belt drive. The collecting auger is installed on the inner wall of the settling chamber cover, and its function is to collect and discharge the settled debris when rotating. The discharge port is a rectangular slot at the bottom of the settling device cover, installed directly above the collecting trough II, for discharging debris from the settling chamber.

[0008] As a further embodiment of the present invention, the graded seed discharging device includes a collection trough I, a discharge pipe I, a discharge pipe II, a collection trough II, a primary seed discharge pipe, a primary seed discharge trough, a secondary seed vibrating screen, a tertiary seed discharge trough, a tertiary seed discharge pipe, and a discharge outlet. The seed discharging device is used to discharge the impurities and seeds of different grades after the multi-stage vibrating screen and sedimentation discharge device have been cleaned. The impurity collection trough I is installed at the end of the seed dropping sieve, with a certain height difference between its front and rear ends, and is used to collect and discharge larger particles of impurities mixed in with the seeds; the impurity discharge pipe I is fixedly installed to the support frame with bolts, and its inlet is connected to the end of the impurity collection trough I, used to guide larger particles of impurities to fall into the impurity receiving hopper I; the impurity collection trough II is fixedly installed at the front and rear ends of the inner wall of the cleaning sieve frame with bolts, and has a certain height difference between its front and rear ends; the impurity discharge pipe II is installed at the front of the cleaning sieve frame, and its inlet is connected to the front port of the impurity collection trough II, used to guide the dust and impurities discharged by the settling device; the front and rear ends of the primary seed dropping trough are installed on the inner wall of the cleaning sieve frame, with a certain height difference between its front and rear ends, located between the cleaning screen I and the primary cleaning sieve, used to collect the primary seeds cleaned on the screen surface of the primary cleaning sieve; The primary seed metering pipe inlet is fitted onto the seed outlet at the end of the primary seed trough, and the seed outlet position of the primary seed metering pipe can be freely adjusted. The secondary seed vibrating air screen is installed on the cleaning screen frame, located between the cleaning screen II and the secondary cleaning screen, and is used to discharge secondary seeds from the secondary cleaning screen surface. After the seeds fall onto the vibrating air screen surface, the bottom fan provides air force to blow the seed surface or unscreened impurities through the impurity inlet channel into the settling chamber. The tertiary seed trough is installed on the inner wall of the cleaning screen frame, located at the end of the tertiary cleaning screen, and is used to discharge tertiary seeds from the tertiary cleaning screen surface. The tertiary seed metering pipe inlet is fitted onto the seed outlet at the end of the tertiary seed trough, and the seed outlet position of the seed metering pipe can be freely adjusted. The impurity outlet is installed at the end of the impurity discharge pipe II, and is used to collect the dust discharged from the impurity discharge pipe and discharge it into the bottom impurity hopper II.

[0009] As a further embodiment of the present invention, the frame and power control device 5 includes a transmission cover, cleaning device support legs, vibration transmission plate, electrical control box, support frame, impurity receiving hopper II, impurity receiving hopper I, frame base plate, motor bracket, motor, and eccentric excitation rod. The cleaning device's legs are mounted on the base plate of the frame below and fixed to the cleaning screen frame above with bolts, serving to support and assist in vibrating the cleaning device. The electrical control box is mounted on the base plate of the frame, located to the right of the cleaning device's legs, serving as the main power source for the entire device, providing power to the working motors and controlling their speed to ensure normal operation. The support frame consists of two trapezoidal sheet metal parts, with the lower end fixed to the base plate of the frame with bolts. A bearing support is installed at a certain height near the base plate of the frame to support the eccentric vibrating rod. The eccentric component in the middle of the eccentric vibrating rod is connected to the vibrating bearing plate through a plate, its function being to drive the bearing plate to vibrate through the rotation of the eccentric mechanism. The vibrating bearing plate is a square sheet metal part, connected to the bottom right end of the three-stage cleaning screen with bolts, serving to transmit vibration to the entire screen body inside the cleaning device. The impurity collection hoppers I and II are fixed to the base plate of the frame through mounting grooves, located below the impurity discharge pipes I and II respectively, serving to collect the dust and impurities screened out by the cleaning device. The motor is mounted on the base plate of the frame via a motor bracket and is connected to the eccentric excitation rod and the pulley of the auger shaft via belt drive, providing adjustable excitation for the entire multi-stage cleaning device; the transmission cover is installed on the outer wall of the rear side of the settling chamber cover of the settling and impurity removal device, which serves to protect the operator's safety.

[0010] On the other hand, the present invention provides a cleaning method for a multi-stage air-screen seed cleaner, which uses the above-mentioned multi-stage air-screen seed cleaner to clean seeds.

[0011] The beneficial effects of this invention are:

[0012] This invention provides a multi-stage seed air-screening and cleaning machine, targeting the grading and cleaning of irregular seeds such as alfalfa. Based on a comprehensive seed grading and cleaning scheme of uniform seed feeding, multi-stage vibrating sieving, and air-screening for impurity removal, the machine comprises a uniform seed feeding device, a multi-stage vibrating sieving device, a sedimentation and impurity removal device, a grading and seed output device, a frame, and a power control device. It is fully functional, easy to operate, economical, and low-cost. During processing, it exhibits excellent cleaning and grading performance and high efficiency, enabling rapid, accurate, and effective real-time uniform feeding, stable adaptation to grading and cleaning, and grading and seed output for subsequent seed processing. The graded and cleaned seeds show significantly improved growth and biomass yield throughout the entire growth cycle, providing favorable conditions for the high-quality and efficient supply of forage. It greatly reduces costs and operating time, improves efficiency, and offers good economic and social benefits, possessing a broad market prospect. Attached Figure Description

[0013] Figure 1This invention is a multi-stage air-screen seed cleaning machine;

[0014] Figure 2 This is an isometric view of the uniform seeding device of the present invention;

[0015] Figure 3 This is a front view of the uniform seeding device of the present invention;

[0016] Figure 4 This is a top view of the multi-stage vibrating screen and graded seed dispensing device of the present invention;

[0017] Figure 5 This is a front view of the multi-stage vibrating screen and grading seed dispensing device of the present invention;

[0018] Figure 6 yes Figure 5 AA cross-section view;

[0019] Figure 7 This is a partial cross-sectional view of the sedimentation and impurity removal device of the present invention;

[0020] Figure 8 This is an isometric view of the frame and power control device of the present invention;

[0021] Figure 1-8 Chinese labels:

[0022] 1- Uniform seed feeding device, 101- Hopper, 102- Support base plate, 103- Discharge baffle, 104- Secondary vibration shaft, 105- Small rocker arm, 106- Secondary swing arm, 107- Vibration rib, 108- Vibration discharge plate, 109- Spring screw, 110- Vibration main shaft, 111- Eccentric connecting rod, 112- Discharge plate bracket, 113- Main swing arm, 114- Hopper side lug, 115- Seed guide base, 116- Inoculation plate adjustment mechanism, 117- Impurity feeding device 118-Inoculation plate, 2-Multi-stage vibrating screen device, 201-Debris cover, 202-Side lug of cleaning screen frame, 203-Cleaning screen frame, 204-Seed dropping screen, 205-Cleaning screen II, 206-Secondary cleaning screen, 207-Cleaning screen I, 208-Primary cleaning screen, 209-Tertiary cleaning screen, 210-Seed thinning scraper, 211-Seed guide plate, 3-Settling and impurity removal device, 301-Dust outlet, 302-Settling chamber cover, 303-Adjustment Handwheel 304 - Air-blown impurity inlet channel, 305 - Air intake fan, 306 - Settling device base frame, 307 - Impurity discharge port, 308 - Impurity collecting auger shaft, 309 - Pulley, 310 - Rotating gear, 311 - Impurity inlet, 312 - Linkage rack, 313 - Guide baffle, 314 - Settling chamber, 4 - Graded seed dispensing device, 401 - Impurity collecting trough I, 402 - Impurity dropping pipe I, 403 - Impurity dropping pipe II, 404 - Impurity collecting trough II, 405 - Primary seed dispensing pipe, 4 06-First-stage seed drop trough, 407-Second-stage seed vibrating air screen, 408-Third-stage seed drop trough, 409-Third-stage seed discharge pipe, 410-Miscellaneous discharge outlet, 5-Frame and power control device, 501-Transmission cover, 502-Cleaning device support leg, 503-Vibration transmission plate, 504-Electrical control box, 505-Support frame, 506-Miscellaneous hopper II, 507-Miscellaneous hopper I, 508-Frame base plate, 509-Motor bracket, 510-Motor, 511-Eccentric excitation rod. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. In the description of the present invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] This invention provides a specific embodiment of a multi-stage air-screen cleaning machine for irregular seeds such as alfalfa:

[0025] A multi-stage air-screen seed cleaner includes a uniform seed feeding device, a multi-stage vibrating screen device, a sedimentation and impurity removal device, a grading and seed dispensing device, a frame, and a power control device. The uniform seed feeding device, the multi-stage vibrating screen device, and the sedimentation and impurity removal device work together to achieve uniform grading and cleaning of the seeds. After grading and cleaning, the seeds are graded and dispensed by the grading and seed dispensing device. The frame and power control device are used to support and install the above-mentioned seed processing device and provide power to the seed cleaner.

[0026] The uniform seed feeding device is the head feeding mechanism of a multi-stage air-screen seed cleaner, including a hopper 101, a support base plate 102, a discharge baffle 103, a secondary vibration shaft 104, a small rocker arm 105, a secondary swing arm 106, a vibration rib plate 107, a vibration discharge plate 108, a spring screw 109, a vibration main shaft 110, an eccentric connecting rod 111, a discharge plate bracket 112, a main swing arm 113, a hopper side ear 114, a seed guide base 115, an inoculation plate adjustment mechanism 116, an inlet sealing plate 117, and an inoculation plate 118. The seed feeding device is installed above the cleaning and screening machine frame 203 and the two side support frames 505. The hopper 101 is fixed to the support frame with bolts, and the seed guide base 115 is fixed to the front and rear outer walls of the cleaning and screening machine frame 203 with bolts. Driven by the main vibration shaft 110 and the vibration eccentric connecting rod 111, the seed feeding device feeds the seeds in the hopper 101 evenly and stably from the seed guide base 115 into the multi-stage vibrating screen device. The hopper side ears 114 on the front and rear sides of the hopper 101 and the two front and rear support frames 505 are fixedly connected by bolts. The support base plate 102 and the discharge baffle 103 are connected by a straight sliding groove, which is connected by a spring screw 109. Adjusting the tightness of the spring screw 109 or its relative connection position with the straight sliding groove can adjust the distance between the discharge baffle 103 and the discharge port at the bottom of the hopper, thereby adjusting the seed output per unit time. The small rocker arm 105 is installed at both ends of the vibration sub-shaft 104 and connected to the sub-swing arm, which plays a role in the overall vibration, support, and amplitude increase of the discharge plate. The two side vibration ribs 107 are connected to the support base plate through the vibration sub-shaft 104, and their function is to provide small-amplitude excitation to the discharge baffle. The sub-swing arm 106 is connected to the discharge plate bracket by a pin. The upper end of the discharge plate bracket 112 is connected to the main swing arm by a pin to form a rotating pair, and an adjustable tilt angle vibrating discharge plate 108 is installed in the middle. The sliding speed of the seeds on the surface of the discharge plate is adjusted by changing the tilt angle. The lower end of the main swing arm 113 is equipped with a vibration main shaft. 110; An eccentric connecting rod 111 is installed on the vibrating main shaft 110, and is connected to the impurity discharge auger shaft 308 via a V-belt for transmission; the other end of the eccentric connecting rod 111 is fixedly connected to the underside of the vibrating discharge plate 108, which excites the entire seed feeding device to achieve uniform seed dropping; the upper end of the impurity inlet sealing plate 117 is connected to the inner wall of the impurity inlet channel 311 of the sedimentation and impurity discharge device, and the lower end is clearance-fitted with the inoculation plate 118. Due to inertia, dust and impurities mixed in the seeds falling from the vibrating discharge plate onto the inoculation plate are easily stirred up and fall off, and enter the sedimentation and impurity discharge device through the impurity inlet 311 under the negative pressure suction in the sedimentation chamber; the lower end of the inoculation plate 118 is movably connected to the inoculation plate adjustment device 216, and the inoculation height and angle are adjusted by the extension and retraction of the electric cylinder of the adjustment device; the seed guide base 115 is installed on the front and rear outer walls of the cleaning sieve frame 203, and its function is to guide the seeds sliding off the inoculation plate into the multi-stage vibrating sieve device.

[0027] As a further embodiment of the present invention, the multi-stage vibrating screen device 2 includes a debris guard 201, a cleaning screen frame side lug 202, a cleaning screen frame 203, a seed dropping screen 204, a cleaning screen II 205, a secondary cleaning screen 206, a cleaning screen I 207, a primary cleaning screen 208, a tertiary cleaning screen 209, a seed thinning scraper 210, and a seed guide plate 211. The main body of the vibrating screen device is fixedly connected to the cleaning screen frame side lug 202 and the cleaning device support leg 502 installed on the frame base plate 508 by bolts. The upper part of the cleaning screen frame 203 near the debris guard is connected to the seed feeding base of the uniform seed feeding device by bolts. The multi-stage vibrating screen body of the cleaning screen is installed on... Inside the cleaning sieve frame; the debris guard 201 is installed on the cleaning sieve frame 203, its function is to prevent dust and debris caused by the vibration of the seed feeding device from falling directly into the seed guide plate; the seed dropping sieve 204 is installed on the cleaning sieve frame 203, its function is to receive the seeds sliding off the seed guide base 115 and sieve the seeds onto the seed guide plate, the seed dropping sieve has several through holes corresponding to the seed size, ensuring that the seeds fall smoothly while discharging larger debris through the debris collection trough I401 installed at the end of the seed dropping sieve; the seed guide plate 211 is fixed to the cleaning sieve frame 203 at a certain angle, its function is to buffer the seeds falling from the seed dropping sieve 204 and guide the seeds... The seeds flow to the front end of the primary cleaning screen 208. The primary cleaning screen 208 is drawer-shaped, with several small, irregularly shaped seed-shaped through holes arrayed on its surface. Four rows of arc-shaped hooks are fixed below the screen surface, and are movably connected to the cleaning screen I 207 through the arc-shaped hooks. The arc-shaped hooks can assist in the vibration of the cleaning screen I 207 when the primary cleaning screen vibrates, providing the function of vibration to clear blocked seeds. Several crossbars are welded to the upper part of the main body of the cleaning screen I 207 for flexible adjustment of the connection with the arc-shaped hooks. The lower part is a mesh screen, which is movably connected to the cleaning screen frame 203. The seed thinning scraper 210 is installed on the bottom surface of the cleaning screen I and is fixed to the frame support of the cleaning screen I. The primary cleaning screen 208 disperses and buffers the seeds falling from the secondary cleaning screen 206, and clears the seeds piled up and blocked on the secondary cleaning screen 206 during vibration. The secondary cleaning screen is movably connected to the cleaning screen II 205 through arc-shaped hooks installed on its bottom surface, and the screen surface has several extremely small irregular seed-shaped holes. The cleaning screen II 205 is movably connected to the cleaning screen frame 206, and has multiple crossbars welded on the top, which can be flexibly adjusted to connect with the arc-shaped hooks. The bottom is a mesh screen. The tertiary cleaning screen 209 is a rectangular steel plate, installed at the bottom of the cleaning screen II 205, and fixed at a certain angle to the cleaning screen frame 203. Its function is to screen small seeds.

[0028] As a further embodiment of the present invention, the settling and impurity removal device 3) includes a dust outlet 301, a settling chamber cover 302, an adjusting handwheel 303, an air-blowing impurity inlet channel 304, a fan 305, a settling device base frame 306, an impurity discharge port 307, an impurity collecting auger shaft 308, a pulley 309, a rotating gear 310, an impurity inlet 311, a linkage rack 312, a guide baffle 313, and a settling chamber 314; the main body of the settling and impurity removal device is mounted on the frame base plate on the right side via the settling device base frame 306, and on the other side via the settling chamber cover 302 above the cleaning screen frame 203; the main body of the dust outlet 301 is mounted above the settling device cover 302, and the dust outlet can be connected to an external dust collection device; the settling device cover 302 is mounted above the cleaning screen frame 203, and the left side of the cover has an inoculation plate 118 mounting opening to facilitate the inoculation plate to pass through and complete the installation; The settling chamber 314 is a spatial area enclosed by the settling chamber cover 302, which serves to settle larger particles of dust and other debris under the action of wind and gravity. The air-blowing debris inlet channel 304 is installed on the outside of the settling device and is fixedly connected to the air intake fan 315 to form a debris air-blowing and cleaning section, which guides the airflow generated by the fan 305 into the settling chamber 314. The guide baffle 313 is movably connected to the settling device cover 302 and can be adjusted in angle to guide dust in different directions. The adjusting handwheels 303 are installed in pairs on the front of the settling device cover. The linkage rack 312 has a baffle at its bottom and is installed on the inner wall of the settling device cover. The rotating gear 310 is engaged and is coaxial with the rotation center of the adjusting handwheel. As the adjusting handwheel rotates, it drives the bottom baffle of the linkage rack to extend and retract, adjusting the size of the opening of the impurity inlet 311 and the air-blown impurity inlet channel 304. The pulley 309 is coaxial with the rotation center of the impurity collecting auger and provides power for the rotation of the impurity collecting auger, and provides power for the rotation of the vibration main shaft 110 of the uniform seed feeding device through belt drive. The impurity collecting auger 308 is installed on the inner wall of the settling chamber cover 302 and its function is to collect and discharge the settled impurities when rotating. The impurity discharge port 307 is a rectangular slot at the bottom of the settling device cover and is installed directly above the impurity collecting trough II 404 for discharging impurities from the settling chamber.

[0029] As a further embodiment of the present invention, the graded seed discharging device includes a collection trough I 401, a waste discharge pipe I 402, a waste discharge pipe II 403, a collection trough II 404, a primary seed discharge pipe 405, a primary seed discharge trough 406, a secondary seed vibrating screen 407, a tertiary seed discharge trough 408, a tertiary seed discharge pipe 409, and a waste outlet 410. The seed discharging device is used to discharge the impurities and seeds of different grades after cleaning by the multi-stage vibrating screen device and the sedimentation waste discharge device. The impurity collection trough I 401 is installed at the end of the seed dropping sieve, with a certain height difference between its front and rear ends, and is used to collect and discharge larger particles of impurities mixed in the seeds; the impurity discharge pipe I 402 is fixedly installed to the support frame 505 by bolts, and its inlet is connected to the end of the impurity collection trough I, and is used to guide larger particles of impurities to fall into the impurity receiving hopper I 507; the impurity collection trough II 404 is fixedly installed at both ends of the inner wall of the cleaning sieve frame by bolts, and has a certain height difference between its front and rear ends; the impurity discharge pipe II 403 is installed at the front of the cleaning sieve frame, and its inlet is connected to the front port of the impurity collection trough II, and is used to guide the dust and impurities discharged by the settling device; the primary seed dropping trough 406 is installed at both ends of the inner wall of the cleaning sieve frame, with a certain height difference between its front and rear ends, and is located between the cleaning screen I 207 and the primary cleaning screen 208, and is used to collect the primary seeds cleaned on the screen surface of the primary cleaning screen; the primary discharge... The seed inlet of the seed tube 405 is fitted at the end of the primary seed trough, and the seed outlet of the seed tube can be freely adjusted to allow for the primary seed outlet position. The secondary seed vibrating air screen 407 is installed on the cleaning screen frame, located between the cleaning screen II 205 and the secondary cleaning screen 206, and is used to discharge the secondary seeds on the screen surface of the secondary cleaning screen 213. After the seeds fall onto the screen surface of the vibrating air screen, the bottom fan 305 provides air force to blow the seed surface or unscreened impurities into the settling chamber through the impurity inlet channel. The tertiary seed trough 408 is installed on the inner wall of the cleaning screen frame, located at the end of the tertiary cleaning screen 220, and is used to discharge the tertiary seeds on the screen surface of the tertiary cleaning screen 220. The seed inlet of the tertiary seed outlet 409 is fitted at the end of the tertiary seed trough, and the seed outlet of the seed outlet can be freely adjusted to allow for the primary seed outlet position. The impurity outlet 410 is installed at the end of the impurity discharge pipe II and is used to collect the dust discharged from the impurity discharge pipe and discharge it into the bottom impurity hopper II. .

[0030] As a further embodiment of the present invention, the frame and power control device include a transmission cover 501, cleaning device support legs 502, a vibration transmission plate 503, an electrical control box 504, a support frame 505, a receiving hopper II 506, a receiving hopper I 507, a frame base plate 508, a motor bracket 509, a motor 510, and an eccentric exciter rod 511. The cleaning device support legs 502 are mounted on the frame base plate 508 at the bottom and fixedly connected to the cleaning screen frame at the top by bolts, serving to support and assist in vibrating the cleaning device. The electrical control box 504 is mounted on the frame base plate, located to the right of the cleaning device support legs, serving as the main power source for the entire device, providing power to the working motor and controlling its speed to ensure normal operation. The support frame 505 consists of two trapezoidal sheet metal parts, with the lower end fixedly mounted on the frame base plate by bolts. A bearing support is installed at a certain height near the frame base plate to support the eccentric exciter rod. The eccentric vibrating rod 511 has an eccentric component in the middle connected to the vibrating bearing plate via a plate. Its function is to drive the bearing plate to vibrate through the rotation of the eccentric mechanism. The vibrating bearing plate 503 is a square sheet metal part, which is connected to the bottom right end of the three-stage cleaning screen by bolts. It is used to transmit vibration to the screen body inside the entire cleaning device. The impurity collecting hoppers I 507 and II 506 are fixed to the base plate of the frame through mounting grooves. They are located below the impurity dropping pipes I 402 and II 403, respectively, and are used to collect the dust and impurities screened out by the cleaning device. The motor 510 is mounted on the base plate of the frame through a motor bracket 509. It is connected to the eccentric vibrating rod and the impurity collecting auger shaft pulley through belt drive, providing adjustable excitation for the entire multi-stage cleaning device. The transmission cover 501 is installed on the outer wall of the rear side of the settling chamber cover of the settling and impurity removal device, which serves to protect the operator's safety.

[0031] A cleaning method for a multi-stage air-screen seed cleaner includes the following steps:

[0032] Irregularly shaped seeds such as S1 and alfalfa fall evenly onto the surface of the inoculation plate through the hopper under the action of vibration. Under the action of inertia, the impurities and dust mixed in the seeds are stirred up and enter the impurity inlet channel through the gap formed by the inoculation plate and the impurity inlet, and the impurities and dust are initially cleaned.

[0033] S2. Seeds slide from the inoculation plate onto the seed inlet base, and then fall onto the surface of the seed dropping screen. Under the action of gravity, they move downwards. The seed dropping screen screens out larger particles of debris, which are discharged through the debris collection trough I installed at the end of the seed dropping screen.

[0034] S3. Seeds fall onto the surface of the primary cleaning sieve and move towards the end of the sieve under vibration, then fall into the primary seed dropping trough. Smaller seeds that are screened out fall onto cleaning screen I, and under the action of the seed thinning scraper, the seeds fall evenly onto the surface of the secondary cleaning sieve. The seeds move to the surface of the vibrating air screen under the vibration of the cleaning sieve, and the impurities and dust mixed in the secondary seeds are settled and removed under the action of the fan and the settling device. The smallest seeds fall from cleaning screen II into the tertiary cleaning sieve, and fall to the right into the tertiary seed dropping trough with vibration;

[0035] S4. The grading and seed dispensing device collects the graded and cleaned seeds that fall into it, and discharges the processed seeds through the seed discharge pipe. (See also...) Figures 1 to 8 As shown.

[0036] The multi-stage air-screen seed cleaner of this embodiment includes 1. a uniform seed feeding device, 2. a multi-stage vibrating screen device, 3. a sedimentation and impurity removal device, 4. a graded seed output device, 5. a frame and a power control device.

[0037] Combination Figure 1 , Figure 2 and Figure 3 As shown, seeds mixed with impurities enter the hopper from above the uniform seed feeding device. The seed outlet baffle fits snugly against the opening below the hopper to form an adjustable seed outlet, sized by adjusting the relative position of the bolts and springs at the straight sliding groove opening. Seeds fall from the seed outlet onto the surface of the vibrating discharge plate. The main vibration shaft, combined with the vibrating eccentric connecting rod, excites the seeds. This excitation is transmitted to the discharge plate via a linkage mechanism consisting of a main swing arm, discharge plate support, auxiliary swing arm, and small rocker arm. Under the excitation, the seeds on the discharge plate leap forward and fall into the inoculation plate. The inoculation plate, combined with the impurity inlet, forms an impurity inlet gap. Driven by the seed flow and the negative pressure in the settling chamber, the dust stirred up by the mixed seeds is sucked into the settling chamber. The seeds slide down the inclined inoculation plate into the seed feeding base, and then slide from the seed feeding base into the seed dropping screen.

[0038] Combination Figure 1 , Figure 4 , Figure 5 and Figure 6As shown, seeds slide from the seed inlet base into the seed dropping screen, where they slide down the inclined screen, removing larger particles of impurities mixed in with the seeds. These particles then roll into the collection trough I, which is inclined at the end of the seed dropping screen. The screened seeds fall from the seed dropping screen onto the surface of the inclined guide screen, sliding down to the front of the primary cleaning screen to increase the seed screening time. After falling into the primary cleaning screen, larger seeds, under vibration, enter the primary seed dropping trough, which is inclined between the ends of the primary cleaning screen and the cleaning screen I, and are discharged through the primary seed dropping tube. Smaller seeds fall through the mesh of the cleaning screen I into the thinning scraper below. The thinning scraper is inclined at the bottom of the cleaning screen I; its function is to increase the cleaning time of the seeds on the secondary cleaning screen surface, and simultaneously, under vibration, to clear the seeds on the secondary cleaning screen surface, preventing seed clumping and blockage. Subsequently, the seeds enter the vibrating air screen from the secondary cleaning screen and are air-separated by the fan; the smallest seeds fall from the grid of the cleaning screen II into the tertiary cleaning screen, and are transported to the tertiary seed drop trough by the vibration of the tertiary cleaning screen, and discharged with the tertiary seed drop pipe.

[0039] Combination Figure 1 , Figure 6 and Figure 7 As shown, the settling and impurity removal device is installed on the multi-stage cleaning device, mainly consisting of two impurity inlets on the left and right, and two impurity outlets on the top and bottom. Dust stirred up by the seeds falling onto the inoculation plate is drawn into the settling chamber through the left impurity inlet. The seeds are on a secondary vibrating screen, and the fan blows the dust into the settling chamber through the right impurity inlet. The dust entering the settling chamber is guided by the guide plates on both sides, converging at the center. Under the continuous circulating flow within the settling chamber, some lighter dust particles drift out through the top dust outlet and are collected by an external dust collection device. Heavier impurities fall from the discharge outlet into the collection trough II through the impurity discharge pipe II, and are then collected in the receiving hopper.

Claims

1. A multi-stage air-screen seed cleaning machine, characterized in that: The system includes a uniform seed feeding device (1), a multi-stage vibrating screen device (2), a sedimentation and impurity removal device (3), a graded seed discharge device (4), a frame, and a power control device (5). The graded seed discharge device (4) is used to discharge impurities and seeds of different grades after cleaning. The uniform seed feeding device (1) includes a hopper (101), a support base plate (102), a discharge baffle (103), a secondary vibration shaft (104), a small rocker arm (105), a secondary swing arm (106), a vibration rib plate (107), a vibration discharge plate (108), a spring screw (109), a vibration main shaft (110), and an eccentric connecting rod (111). The discharge plate bracket (112), main swing arm (113), hopper side ear (114), seed guide base (115), inoculation plate adjustment mechanism (116), inlet sealing plate (117), and inoculation plate (118) are all installed on the cleaning screen frame (203) and the two side support frames (505). The hopper (101) is fixed to the support frame (505) by bolts. The seed guide base (115) is fixed to the front and rear outer walls of the cleaning screen frame (203) by bolts. The uniform seed feeding device (1) is driven by the vibrating main shaft (110) and the vibrating eccentric connecting rod (111). The seeds in the hopper (101) are fed evenly and stably from the seed guide base (115) into the multi-stage vibrating screen device (2). The hopper side ears (114) on the front and rear sides of the hopper (101) and the front and rear support frames (505) are fixedly connected by bolts. The support base plate (102) is set at the bottom of the side of the hopper (101). The support base plate (102) has a straight sliding groove at the connection position with the discharge baffle (103), and is connected by a spring screw (109). By adjusting the tightness of the spring screw (109) or its connection position with the straight sliding groove, the connection between the discharge baffle (103) and the bottom of the hopper (101) can be adjusted. The spacing of the discharge ports, the small rocker arm (105) is installed at both ends of the secondary vibration shaft (104) and connected to the secondary swing arm (106); the vibration ribs (107) on both sides are connected to the support base plate (102) through the secondary vibration shaft (104) to give small-amplitude excitation to the discharge baffle; the secondary swing arm (106) is connected to the discharge plate bracket (112) through the pin shaft, and the upper end of the discharge plate bracket (112) is connected to the main swing arm (113) through the pin shaft to form a rotating pair, and a vibrating discharge plate (108) with adjustable tilt angle is installed in the middle, and the sliding speed of the seeds on the surface of the vibrating discharge plate (108) is adjusted by changing the tilt angle;The main swing arm (113) is equipped with a vibrating main shaft (110) at its lower end. An eccentric connecting rod (111) is mounted on the vibrating main shaft (110) and is connected to the impurity collecting auger shaft (308) via a V-belt for transmission. The other end of the eccentric connecting rod (111) is fixedly connected to the underside of the vibrating discharge plate (108). The upper end of the impurity inlet sealing plate (117) is connected to the inner wall of the impurity inlet channel (311) of the settling and impurity discharge device, and the lower end is in clearance fit with the inoculation plate (118). The dust and impurities mixed in the seeds falling from the discharge plate (108) onto the inoculation plate (118) are stirred up and fall off. Under the negative pressure suction in the settling chamber, they enter the settling and impurity removal device (3) through the impurity inlet (311). The lower end of the inoculation plate (118) is movably connected to the inoculation plate adjustment mechanism (116). The seed guide base (115) is installed on the front and rear outer walls of the cleaning and screening frame (203) to guide the seeds that slide off the inoculation plate (118) into the multi-stage vibrating screen device. The multi-stage vibrating screen device (2) includes a debris cover (201), a cleaning screen frame side lug (202), a cleaning screen frame (203), a seed dropping screen (204), a cleaning screen II (205), a secondary cleaning screen (206), a cleaning screen I (207), a primary cleaning screen (208), a tertiary cleaning screen (209), a seed thinning scraper (210), and a seed guide plate (211). The main body of the multi-stage vibrating screen device (2) is fixedly connected to the cleaning screen frame side lug (202) and the cleaning device support leg (502) installed on the frame base plate (508) by bolts. The upper part of the cleaning screen frame (203) near the debris cover is connected to the seed feeding base of the uniform seed feeding device (1) by bolts. The vibrating screen body is installed inside the cleaning screen frame (203); the debris cover (201) is installed on the cleaning screen frame (203) and its function is to prevent dust and debris caused by the vibration of the seed feeding device from falling directly into the seed guide plate (211); the seed dropping screen (204) is installed on the cleaning screen frame (203) and its function is to receive the seeds that slide off the seed guide base (115) and screen the seeds to the seed guide plate (211). The seed dropping screen (204) has several through holes corresponding to the seed size, which ensures that the seeds fall smoothly while discharging larger debris through the debris collection trough I (401) installed at the end of the seed dropping screen (204); the seed guide plate (211) is at a certain angle to the cleaning screen frame (203). The seeds are guided to the front end of the primary cleaning sieve (208). The primary cleaning sieve (208) is drawer-shaped with several small, irregular seed-shaped through holes arrayed on its surface. Four rows of arc-shaped hook teeth are fixed under the sieve surface and are movably connected to the cleaning screen I (207) through the arc-shaped hook teeth. The arc-shaped hook teeth can assist in the vibration of the cleaning screen I (207) when the primary cleaning sieve (208) vibrates, providing the function of vibration to clear the blocked seeds. Several crossbars are welded to the upper part of the main body of the cleaning screen I (207) for adjusting the connection with the arc-shaped hook teeth. The bottom is a mesh sieve and the whole is movably connected to the cleaning sieve frame (203). The seed thinning scraper (210) is installed on the bottom surface of the cleaning screen I (207) and is connected to the cleaning screen. The frame support of I (207) is fixed to disperse and buffer the seeds falling from the primary cleaning screen (208), and clear the seeds piled up and blocked on the secondary cleaning screen (206) during vibration; the secondary cleaning screen (206) is movably connected to the cleaning screen II (205) through the arc-shaped hook teeth installed on its bottom surface, and there are several extremely small irregular seed-shaped holes arrayed on the screen surface; the cleaning screen II (205) is movably connected to the cleaning screen frame (203), and has multiple crossbars welded on the top, which can adjust the connection with the arc-shaped hook teeth, and the bottom is a mesh screen; the tertiary cleaning screen (209) is a rectangular steel plate, installed at the bottom of the cleaning screen II (205), and fixed to the cleaning screen frame (203) at a certain angle.

2. The multi-stage air-screen seed cleaner according to claim 1, characterized in that: The settling and impurity removal device (3) includes a dust outlet (301), a settling chamber cover (302), an adjusting handwheel (303), an air-blowing impurity inlet channel (304), a fan (305), a settling device base frame (306), an impurity outlet (307), an impurity collecting auger shaft (308), a pulley (309), a rotating gear (310), an impurity inlet (311), a linkage rack (312), a guide baffle (313), and a settling chamber (314). The main body of the settling and impurity removal device (3) is mounted on the frame base plate (508) on the right side via the settling device base frame (306), and on one side... The settling chamber cover (302) is installed above the cleaning screen frame (203); the main body of the dust outlet (301) is installed above the settling chamber cover (302), and the dust outlet (301) can be connected to an external dust collection device; the settling chamber cover (302) is installed above the cleaning screen frame (203), and an inoculation plate (118) installation port is opened on the left side of the settling chamber cover (302); the settling chamber (314) is a spatial area enclosed by the settling chamber cover (302); the air blowing inlet channel (304) is installed outside the settling device, and is connected to the air intake fan (315). The fixed connection forms the debris blowing and cleaning section, which guides the airflow generated by the blower (305) into the settling chamber (314); the guide baffle (313) is movably connected to the settling chamber cover (302), and the installation angle can be adjusted; the adjusting handwheels (303) are installed in pairs in front of the settling chamber cover (302); the bottom of the linkage rack (312) is equipped with a baffle, which is installed on the inner wall of the settling chamber cover (302) and meshes with the rotating gear (310). The rotating gear (310) and the adjusting handwheel (303) are coaxial in rotation. As the adjusting handwheel (303) rotates... The movement then drives the bottom baffle of the linkage rack (312) to extend and retract, thereby adjusting the size of the inlet (311) and the air-blown inlet channel (304). The pulley (309) is coaxial with the rotation center of the inlet auger, providing power for the rotation of the inlet auger, and providing power for the rotation of the vibration main shaft (110) of the uniform seed feeding device (1) through belt drive. The inlet auger shaft (308) is installed on the inner wall of the settling chamber cover (302), and the outlet (307) is a rectangular long slot at the bottom of the settling chamber cover (302), installed directly above the inlet trough II (404).

3. The multi-stage air-screen seed cleaner according to claim 2, characterized in that: The graded seed dispensing device (4) includes a collection trough I (401), a waste discharge pipe I (402), a waste discharge pipe II (403), a collection trough II (404), a primary seed discharge pipe (405), a primary seed discharge trough (406), a secondary seed vibrating screen (407), a tertiary seed discharge trough (408), a tertiary seed discharge pipe (409), and a waste outlet (410). The collection trough I (401) is installed at the end of the seed discharge screen (204), with a certain height difference between its front and rear ends, and is used to collect and discharge larger particles of impurities mixed in the seeds; the waste discharge pipe I (402) The support frame (505) is fixedly installed with bolts, and the inlet is connected to the end of the collection trough I (401). The front and rear ends of the collection trough II (404) are fixedly installed on the inner wall of the cleaning screen frame (203) with bolts, and the front and rear ends have a certain installation height difference. The impurity discharge pipe II (403) is installed in front of the cleaning screen frame (203), and the inlet is connected to the front port of the collection trough II (404). The front and rear ends of the primary seed discharge trough (406) are installed on the inner wall of the cleaning screen frame (203), and the front and rear ends have a certain installation height difference. It is located at the cleaning screen I (201). 7) Between the primary cleaning screen (208) and the secondary cleaning screen (206), the primary seed inlet is fitted onto the end of the primary seed discharge trough (406) to collect the primary seeds cleaned on the screen surface of the primary cleaning screen (208); the seed inlet of the primary seed discharge pipe (405) is fitted onto the end of the primary seed discharge trough (406) to discharge the primary seeds on the screen surface of the secondary cleaning screen (206), and the seeds fall onto the screen surface of the secondary seed vibrating screen (407). The bottom fan (305) provides airflow to blow the seed surface or unscreened impurities into the settling chamber (314) through the impurity inlet (311). The three-stage seed drop trough (408) is installed on the inner wall of the cleaning screen frame (203) and located at the end of the three-stage cleaning screen (209) to discharge the three-stage seeds on the screen surface of the three-stage cleaning screen (209). The seed inlet of the three-stage seed discharge pipe (409) is fitted at the seed outlet position at the end of the three-stage seed drop trough (408). The seed outlet of the three-stage seed discharge pipe can be freely adjusted to the seed outlet position of the three-stage seeds. The impurity outlet (410) is installed at the end of the impurity drop pipe II (403).

4. The multi-stage air-screen seed cleaner according to claim 3, characterized in that: The frame and power control device (5) includes a transmission cover (501), cleaning device support legs (502), a vibration transmission plate (503), an electrical control box (504), a support frame (505), a collection hopper II (506), a collection hopper I (507), a frame base plate (508), a motor bracket (509), a motor (510), and an eccentric exciter rod (511). The cleaning device support legs (502) are mounted on the frame base plate (508) below and fixedly connected to the cleaning screen frame (203) above by bolts. The electrical control box (504) is mounted on the frame base plate (508) to the right of the cleaning device support legs. The support frame (505) consists of two trapezoidal sheet metal parts, with the lower end fixedly mounted on the frame base plate (508) by bolts. It is installed at a certain height close to the frame base plate (508). The eccentric vibrating rod (511) is equipped with a bearing support for supporting the eccentric vibrating rod (511). The eccentric part in the middle of the eccentric vibrating rod (511) is connected to the vibration transmission plate (503) through a plate. The vibration transmission plate (503) is a square sheet metal part, which is connected to the bottom right end of the three-stage cleaning screen (209) by bolts. The impurity receiving hopper I (507) and impurity receiving hopper II (506) are fixed on the frame base plate (508) through the mounting slide, and are located below the impurity discharge pipe I (402) and impurity discharge pipe II (403) respectively. The motor (510) is installed on the frame base plate (508) through the motor bracket (509) and is connected to the eccentric vibrating rod (511) and the impurity collecting auger shaft pulley through the belt drive. The transmission cover (501) is installed on the outer wall of the rear side of the settling chamber cover (302) of the settling and impurity discharge device (3).

5. The cleaning method of the multi-stage air-screen seed cleaner according to any one of claims 1 to 4, characterized in that, Including the following steps: S1. Alfalfa seeds are evenly dropped onto the surface of the inoculation plate (118) through the hopper (101) under the action of vibration. Under the action of inertia, the impurities and dust mixed in the seeds are stirred up and enter the inoculation port (311) through the gap formed by the inoculation plate (118) and the impurity inlet (311) for preliminary cleaning of impurities and dust. S2. The seeds slide down from the inoculation plate (118) to the seed inlet base, and then fall onto the surface of the seed drop sieve (204). Under the action of gravity, the seed drop sieve (204) screens out larger particles of debris, which are discharged through the debris collection trough I (401) installed at the end of the seed drop sieve (204). S3. Seeds fall onto the surface of the primary cleaning sieve (208) and move towards the end of the primary cleaning sieve (208) under vibration. They then fall into the primary seed dropping trough (406). Smaller seeds that are screened out fall into the cleaning mesh sieve I (207). Under the action of the seed thinning scraper (210), the seeds fall evenly onto the surface of the secondary cleaning sieve (206). The seeds move to the surface of the secondary seed vibrating air sieve (407) under the vibration of the secondary cleaning sieve (206). The impurities and dust mixed in the secondary seeds are settled and removed under the action of the fan (305) and the settling device. The smallest seeds fall from the cleaning mesh sieve II (205) into the tertiary cleaning sieve (209) and fall to the right into the tertiary seed dropping trough (408) with vibration. S4. The grading and seed dispensing device (4) collects the graded and cleaned seeds that fall into it and discharges the processed seeds through the seed discharge pipe.

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