A quantitative seed supply system for centrifugal maize precision seed metering system

Abstract

This invention discloses a quantitative seed supply system for a centrifugal precision seed metering system for corn. The device employs a spoon-shaped orifice and a seed guide groove to effectively guide seed filling. A dual flexible brush structure achieves seed cleaning and protection, significantly reducing seed damage. Combined with a seed supply detection and control device, the seed supply rate can be dynamically adjusted. The outer shell and cover plate of the quantitative seed meterer are fixedly connected. The shaft hole of the orifice wheel is connected to the shaft via a key, and the shaft is connected to the outer shell via a bearing. The orifice wheel divides the area enclosed by the outer shell and cover plate into an upper seed storage area and a lower seed dispensing area. The lower opening of the seed dispensing area is sequentially connected to the seed measuring box, seed collection box, connecting pipe, and the seed inlet of the centrifugal seed meterer. This invention, combined with the seed supply detection device, forms a seed supply system that enables real-time monitoring of the seed supply rate and adjusts the orifice wheel rotation speed based on the monitoring results, thereby ensuring a stable seed supply.

Description

Technical Field

[0001] This invention belongs to the technical field of seed-guiding machine parts, specifically a quantitative seed supply system for a centrifugal corn precision seed metering system. Background Technology

[0002] Currently, commonly used mechanical seed metering devices (such as spoon-wheel and finger-clamp types) have simple structures. However, as operating speeds increase, their seed metering stability and accuracy are easily affected, especially under conditions of vibration or uneven ground, where missed seeding becomes more pronounced. While pneumatic seed metering devices (such as suction and pressure types) offer advantages in seed metering accuracy, at high speeds, seed adsorption and release are easily affected by airflow disturbances, leading to deviations in seed fall time and position. Furthermore, pneumatic seed metering devices require high airflow pressure stability; at high speeds, airflow fluctuations may reduce performance, and their high energy consumption impacts operational economy. Centrifugal seed metering systems utilize the centrifugal force generated by seed rotation to complete filling and cleaning, solving the problem of insufficient filling force in mechanical seed metering devices under high-speed conditions. However, existing research indicates that in a static seed supply mode where the seed box and seed metering device are directly connected, the seed sac continuously and violently agitates the seed population, causing the seed population to fill the entire seed metering chamber, resulting in seed metering device malfunction. Existing seed metering systems generally employ grooved wheel seed feeders for dynamic seed supply to maintain the seed quantity in the effective working area of ​​the chamber within a critical threshold range of 50 ± 10 seeds. However, when the operating speed reaches 21 km / h and the number of perforations is 4, the system's seed supply demand surges to 23.33 seeds / second. At this point, the grooved wheel seed feeder reveals significant drawbacks: its periodic pulsed seed supply characteristics result in a large coefficient of variation in the instantaneous seed supply rate, causing alternating phenomena of seed flow interruption and accumulation within the chamber, severely impacting the performance of the seed meterer. Therefore, designing a stable centrifugal maize precision seed metering system with a quantitative seed supply device (quantitative seed feeder) is of great significance. Summary of the Invention

[0003] To address the problem of unstable seed supply in existing centrifugal corn precision seed metering systems, which leads to drastic fluctuations in the number of seeds inside the metering device, this invention aims to provide a quantitative seed supply system. The seed supply device employs a spoon-shaped orifice and a seed guide groove to effectively guide seed filling; a double flexible brush structure achieves seed cleaning and protection, significantly reducing seed damage; combined with a seed supply detection and control device, the seed supply rate can be dynamically adjusted to achieve stable seed supply. The technical solution includes: a quantitative seed feeder, a centrifugal seed metering device, and a connecting pipe. The quantitative seed feeder includes: a cover plate, a shaped orifice wheel, an outer shell, a shaft, a seed collection box, a seed measuring box, and a control system. The outer shell and the cover plate are fixedly connected. The shaft hole of the shaped orifice wheel is connected to the shaft via a key, and the shaft is connected to the outer shell via a bearing. One end of the shaft is connected to the power output of the seed supply motor. The shaped orifice wheel divides the area enclosed by the outer shell and the cover plate into an upper seed storage area and a lower seed dispensing area. The lower opening of the seed dispensing area is sequentially connected to the seed measuring box, the seed collection box, the connecting pipe, and the seed inlet of the centrifugal seed metering device. The upper and lower seed measuring boxes and the seed collection box are integrated into one unit.

[0004] The seed metering box is equipped with a seed supply collection device, which is connected to the quantity collection module of the control system. The quantity collection module interacts with the speed confirmation module, which is connected to the machine speedometer to obtain the real-time speed and send it to the quantity collection module. The quantity collection module obtains the machine's moving speed in real time according to the output formula, calculates the unit seed dispensing quantity of the centrifugal seed metering device at the current machine moving speed, and compares it with the real-time seed supply quantity sent by the seed supply collection device. If the real-time seed supply quantity is greater than the unit seed dispensing quantity, a deceleration signal is sent to the seed supply motor; otherwise, an acceleration signal is sent to the seed supply motor.

[0005] The quantity collection module of the control system is also connected to the seed accumulation height sensor in the seed chamber of the centrifugal seed meterer. If the seed accumulation height sensor sends back a signal, it is considered a sudden blockage, and a stop signal is sent to the seed supply motor drive module to stop the rotation of the seed supply motor. Then the seed supply motor is restarted to the speed before it stopped.

[0006] The quantitative seed dispenser also includes: a seed-protecting brush base, a seed-protecting brush, screws, a seed-cleaning brush, a seed height adjustment plate, a first damping hinge, a second damping hinge, a first bearing, a second bearing, a seed unloading baffle, a key for the seed supply collection device, a gasket, and a seed pusher; the outer shell is the base frame for installing other parts, and the bearing mounting holes in the outer shell are used to install the first bearing and the second bearing, with the shaft making transition fit with the first bearing and the second bearing; the bristle mounting plate of the seed-cleaning brush is connected to the seed-cleaning brush mounting groove by a third bolt, the bristles of the seed-cleaning brush are pressed against the surface of the shaped hole wheel, and the height of the seed-cleaning brush from the shaped hole wheel is adjusted by the third bolt to achieve different seed-cleaning intensities;

[0007] The adjustment plate pull hole of the population height adjustment plate is located outside the outer shell. The middle part of the population height adjustment plate passes through the adjustment plate mounting groove on the upper part of the outer shell. The adjustment plate positioning side plate of the population height adjustment plate is connected to the adjustment plate mounting groove of the outer shell through the adjustment plate fixing bolt group. The adjustment plate mounting groove is located on one side of the breeding area. The adjustment plate sliding boss of the population height adjustment plate is inserted into the adjustment plate sliding groove on the other side of the breeding area and slides in the adjustment plate sliding groove.

[0008] One side of the first damping hinge is fixed to the mounting hole on the first damping hinge by bolts, and the other side of the first damping hinge is fixed to the mounting hole on the lower side of the first damping hinge on the seed discharge baffle. The seed discharge baffle blocks the seed discharge port. When seed discharge is required, the damping of the first damping hinge is reduced, and the seed discharge port is opened by pulling the pull ring on the seed discharge baffle to discharge the seeds in the quantitative seed feeder.

[0009] Along the outer circumference of the shaped hole wheel, there are three rings of spoon-shaped holes at equal intervals. Each spoon-shaped hole in each ring is connected by a seed pushing groove. Between each ring of spoon-shaped holes, there is a ring of seed guiding grooves. The seed guiding grooves face the central ring of spoon-shaped holes. The strip-shaped seed guiding grooves are used to disturb the population and guide the seeds to move towards the shaped holes, which helps to improve the mobility of the population and the filling effect of the seeds.

[0010] A seed pusher is provided on the side of the seed dispensing area near the shaped hole wheel, and the seed pusher located below the outer casing faces the shaped hole wheel; the seed pusher groove of the outer casing is clearance-fitted with the seed pusher sliding plate of the seed pusher, and at the same time, the seed pusher mounting hole and the seed pusher positioning hole are fixed by bolts to achieve complete positioning of the seed pusher; there are multiple parallel seed pusher protrusions, which are inserted into the seed pusher groove, and the number of seed pusher protrusions is the same as the number of seed pusher grooves.

[0011] The seed collection box slide is provided on both sides of the lower opening of the seed dispensing area of ​​the outer shell. The seed measuring box slide groove of the seed measuring box cooperates with the seed collection box slide, which restricts the vertical freedom of the seed measuring box and the seed collection box. The seed measuring box positioning hole and the seed measuring box mounting hole of the seed measuring box are fixed by bolts.

[0012] The two sides of the second damping hinge are respectively connected and fixed to the mounting holes on the second damping hinge of the seed protection brush base and the lower mounting holes on the second damping hinge of the outer shell by bolts, so as to realize the installation of the seed protection brush base and its free opening and closing; the bristle mounting plate of the seed protection brush is fixed to the seed protection brush mounting groove of the seed protection brush base, and the bristles of the seed protection brush are pressed on the surface of the shaped hole wheel; when the quantitative seed feeder is in operation, the seed protection brush base positioning hole on one side of the seed protection brush base and the upper seed protection brush base mounting hole on the outer shell are fixed by bolts.

[0013] The cover plate is fixed by bolts through the cover plate mounting hole and the cover plate positioning hole; the front and rear limiting plates of the outer shell are provided with vertical limiting holes and horizontal limiting holes, which are used to fix the outer shell to the seeder frame.

[0014] The outer side of the bearing mounting hole extends to a central boss of the housing. The first bearing is installed in the central boss of the housing. The central boss of the housing and the bearing mounting hole are separated by an annular portion, thereby separating the first bearing and the second bearing.

[0015] The cover plate has a central hole with a radius of 61 mm. The central hole of the cover plate is clearance-fitted with the shaped hole wheel. After installation, one end face of the shaped hole wheel is inserted into the central hole of the cover plate.

[0016] The diameter of the shaped wheel is 120 mm, and the height of the shaped wheel boss is 2 mm; the shaped wheel boss abuts against the inner ring of the second bearing, reducing the friction of the shaped wheel rotation.

[0017] The maximum depth of the spoon-shaped hole is 6.5 mm, the spherical radius is 6.5 mm, and the radius of the front end gradually changes from 0 mm to 5 mm; each ring of spoon-shaped holes is evenly provided with 20 holes, for a total of 60 holes; the tips of the spoon-shaped holes in each ring face the same direction, and the tips of adjacent rings of spoon-shaped holes are staggered with an intersection angle of 6°.

[0018] Both the seed protection brush and the seed cleaning brush are made of nylon, with an overall thickness of 10mm. The length of the seed protection brush bristles is 75mm, and the length of the seed cleaning brush bristles is 15mm.

[0019] The seed supply collection device includes: a seed supply detection sensor transmitter plate and a seed supply detection sensor receiver plate. The seed supply detection sensor transmitter plate is connected to the seed measuring box by a bolt group. The transmitter plate positioning hole and the transmitter plate mounting hole of the seed supply detection sensor transmitter plate are installed by a first bolt group. The infrared emitting tube is located within the sensor positioning through hole accommodating space.

[0020] The seed supply detection sensor receiving board and the seed measuring box are also connected by bolts. The receiving board positioning hole and receiving board mounting hole of the seed supply detection sensor receiving board are fixed by the second bolt group. The infrared receiving tube is also located within the sensor positioning through hole. The seed supply detection sensor emitting board and the seed supply detection sensor receiving board are arranged opposite each other. The infrared emitting tube and the infrared receiving tube array form a light curtain. When a seed passes through the light curtain area, the intensity of the infrared light received by the infrared receiving tube decreases and the resistance increases. The voltage across the voltage divider resistor of the receiving board connected in series with it decreases. The MCU obtains this signal through the ADC acquisition path and counts the seed supply in real time.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention uses multiple rows of obliquely placed spoon-shaped perforated wheels to pick up seeds. The front end of the perforation is set with a gradually rounded corner, and seed guide grooves are set between different rows, which can effectively guide the filling of seeds. The arrangement of multiple rows of obliquely placed perforations improves the orderliness of seed filling and the stability of supply.

[0023] 2. The present invention adopts a dual flexible brush structure, which reduces the mechanical damage to seeds during the seed cleaning and carrying stage in the seed supply process. The seed cleaning brush is used to remove excess seeds inside the mold hole, and the seed protection brush ensures the stable transport of seeds during the seed carrying stage.

[0024] 3. This invention solves the problem of seeds getting stuck in the die hole and unable to fall out during the seed supply process by using a seed pusher blade in conjunction with a seed pusher groove on the die hole wheel.

[0025] 4. This invention, together with a seed supply detection device, forms a seed supply system that can realize real-time monitoring of the seed supply rate and adjust the rotation speed of the perforated wheel according to the monitoring results, thereby ensuring a stable supply of seeds. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the centrifugal precision corn seeding system of the present invention. It is also a front view of the centrifugal seeding system.

[0027] Figure 2 This is a system connection diagram according to an embodiment of the present invention;

[0028] Figure 3 This is an exploded view of the quantitative seed dispenser in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the cover plate.

[0030] Figure 5 A schematic diagram of the structure of the seed protection brush base;

[0031] Figure 6 This is a schematic diagram of the shaped hole wheel;

[0032] Figure 7 This is a cross-sectional view of the bore diameter surface of the wheel;

[0033] Figure 8 This is a magnified view of a portion of the spoon-shaped hole in the shaped hole wheel;

[0034] Figure 9 This is a schematic diagram of the population height adjustment plate.

[0035] Figure 10 A schematic diagram of the orthogonal view of the outer shell;

[0036] Figure 11A schematic diagram of the back-axis view of the outer casing;

[0037] Figure 12 This is a schematic diagram of the seed unloading baffle.

[0038] Figure 13 A schematic diagram of the structure of the seed supply detection sensor transmitter plate;

[0039] Figure 14 This is a schematic diagram of the seed pusher blade;

[0040] Figure 15 This is a schematic diagram of the seed collection box.

[0041] Figure 16 This is a schematic diagram of the receiving board of the seed supply detection sensor.

[0042] Wherein, 1-cover plate, 101-cover plate positioning hole, 102-cover plate center hole, 103-adjusting plate slide groove, 2-seed brush base, 201-seed brush mounting groove, 202-seed brush base positioning hole, 203-mounting hole on the second damping hinge, 3 - Type 1 bore wheel, 301 - Type 1 bore wheel boss, 302 - Spoon-shaped bore, 303 - Seed guide groove, 304 - Seed pusher groove, 305 - Shaft hole, 4 - Seed protection brush, 5 - Screw, 6 - Seed cleaning brush, 7 - Population height adjustment plate, 701 - Adjustment plate pull hole, 702 - Adjustment plate positioning side plate, 703 - Adjustment plate sliding boss, 8 - Outer shell, 801 - Cover plate mounting hole, 802 - Adjustment plate mounting groove, 803 - Seed cleaning brush mounting groove, 804 - Bearing mounting hole, 805 - Adjustment plate mounting groove, 806 - Outer shell vertical limit hole, 807 - First damping hinge mounting hole, 808 - Seed unloading port, 809 - Type 1 bore wheel positioning groove, 8010 - Outer shell center hole, 8011 - Seed measuring box mounting hole, 801 2-Seed pusher slide groove, 8013-Seed box slide, 8014-Second damping hinge mounting hole, 8015-Seed pusher mounting hole, 8016-Seed protector brush base mounting hole, 8017-Outer shell horizontal limiting hole, 8018-Outer shell vertical limiting plate, 8019-Outer shell center boss, 8021-Outer shell front and rear limiting plates, 9-First damping hinge, 10-Shaft, 11-Second damping hinge, 12-First bearing, 13-Second bearing, 14-Seed unloading baffle, 1401-First damping hinge mounting hole, 1402-Pull ring, 15-Seed supply quantity detection sensor transmitter plate, 1501-Transmitter plate positioning hole, 1502-Infrared emitting tube, 1503-Transmitter plate voltage divider resistor, 1504- 2P terminal block, 16-flat key, 17-gasket, 18-seed pusher, 1801-seed pusher boss, 1802-seed pusher sliding plate, 1803-seed pusher positioning hole, 19-seed collection box, 1901-sensor positioning through hole, 1902-receiver plate mounting hole, 1903-seed measuring box groove, 1904-seed measuring box positioning hole, 1905-transmitter plate mounting hole, 1906-seed collection baffle, 1907-seed outlet hole, 20-seed supply detection sensor receiving board, 2001-receiver plate positioning hole, 2002-infrared receiver tube, 2003-receiver plate voltage divider resistor, 2004-5P terminal block, 21-connecting pipe, 22-centrifugal seed metering device, 23-seed measuring box, 24-quantitative seed feeder. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings.

[0044] like Figures 1-16The embodiment of the present invention shown includes: a quantitative seed feeder 24, a centrifugal seed metering device 22, and a connecting pipe 21. The quantitative seed feeder 24 includes: a cover plate 1, a perforated wheel 3, an outer shell 8, a shaft 10, a seed collection box 19, a seed measuring box 23, and a control system. The outer shell 8 and the cover plate 1 are fixedly connected. The shaft hole 305 in the perforated wheel 3 is connected to the shaft 10 by a key. The shaft 10 is connected to the outer shell 8 by a bearing. One end of the shaft 10 is connected to the power output of the seed supply motor. The perforated wheel 3 divides the area enclosed by the outer shell 8 and the cover plate 1 into an upper seed storage area and a lower seed dispensing area. The lower opening of the seed dispensing area is sequentially connected to the seed measuring box 23, the seed collection box 19, the connecting pipe 21, and the seed inlet of the centrifugal seed metering device 22. The upper and lower seed measuring boxes 23 and the seed collection boxes 19 are integrally formed.

[0045] The seed metering box 23 is equipped with a seed supply collection device, which is connected to the quantity collection module of the control system. The quantity collection module interacts with the speed confirmation module, which is connected to the machine speedometer to obtain the real-time speed and send it to the quantity collection module. The quantity collection module obtains the machine's moving speed in real time according to the output formula and calculates the unit seed dispensing quantity of the centrifugal seed metering device 22 at the current machine moving speed (the time unit is input during initialization, usually between seconds and half a second). It compares this with the real-time seed supply quantity sent by the seed supply collection device. If the real-time seed supply quantity is greater than the unit seed dispensing quantity, a deceleration signal is sent to the seed supply motor to reduce its speed; if the real-time seed supply quantity is less than the unit seed dispensing quantity, an acceleration signal is sent to the seed supply motor to increase its speed.

[0046] The quantity collection module of the control system is also connected to the seed accumulation height sensor in the seed chamber of the centrifugal seed meterer 22. If the seed accumulation height sensor sends back a signal, it is considered as a sudden blockage, and a stop signal is sent to the seed supply motor drive module. After stopping the seed supply motor for 0.5 seconds, the seed supply motor is restarted to the speed before stopping.

[0047] like Figure 10 and Figure 11 The quantitative seed feeder 24 shown also includes: a seed-protecting brush base 2, a seed-protecting brush 4, a screw 5, a seed-cleaning brush 6, a seed height adjustment plate 7, a first damping hinge 9, a second damping hinge 11, a first bearing 12, a second bearing 13, a seed unloading baffle 14, a seed supply collection device key 16, a gasket 17, and a seed pusher 18; the outer shell 8 is the base frame for installing other parts, and the bearing mounting holes 804 in the outer shell 8 are used to install the first bearing 12 and the second bearing 13, and the shaft 10 is transitionally fitted with the first bearing 12 and the second bearing 13; the bristle mounting plate of the seed-cleaning brush 6 is connected to the seed-cleaning brush mounting groove 803 by a third bolt, the bristles of the seed-cleaning brush 6 are pressed on the surface of the shaped hole wheel 3, and the height of the seed-cleaning brush 6 from the shaped hole wheel 3 can be adjusted by loosening or loosening the third bolt to achieve different seed cleaning intensities;

[0048] The adjustment plate pull hole 701 of the population height adjustment plate 7 is set outside the outer shell 8. The middle part of the population height adjustment plate 7 passes through the adjustment plate mounting groove 802 on the upper part of the outer shell 8. The adjustment plate positioning side plate 702 of the population height adjustment plate 7 is connected to the adjustment plate mounting groove 805 of the outer shell 8 through the adjustment plate fixing bolt group. The adjustment plate mounting groove 805 is located on one side of the breeding area. The adjustment plate sliding boss 703 of the population height adjustment plate 7 is inserted into the adjustment plate sliding groove 103 on the other side of the breeding area and slides in the adjustment plate sliding groove 103. When the adjustment plate moves towards the hole wheel 3, the opening for the population to fall is reduced and the population height is reduced. Conversely, it is increased. The relative position of the population height adjustment plate 7 and the outer shell 8 is adjusted by tightening the adjustment plate fixing bolt group.

[0049] One side of the first damping hinge 9 is fixed to the mounting hole 807 on the first damping hinge by bolts, and the other side of the first damping hinge 9 is fixed to the mounting hole on the seed discharge baffle 14. The seed discharge baffle 14 blocks outside the seed discharge port 808. The rotational resistance of the first damping hinge 9 can be adjusted by adjusting the damping stiffness of the first damping hinge 9. When seed discharge is required, the damping of the first damping hinge 9 is reduced, and the seed discharge port 808 is opened by pulling the pull ring 1402 on the seed discharge baffle 14 to discharge the seeds in the quantitative seed feeder.

[0050] The lower opening of the seed area of ​​the outer shell is provided with seed collection box slides 8013 on both sides. The seed measuring box slide groove 1903 of the seed measuring box 23 cooperates with the seed collection box slide 8013, which restricts the vertical freedom of the seed measuring box 23 and the seed collection box 19. The seed measuring box positioning hole 1904 of the seed measuring box 23 is fixed to the seed measuring box mounting hole 8011 by bolts, which restricts the horizontal freedom of the seed collection box 15, and completes the positioning of the seed collection box 15.

[0051] A seed pusher 18 is provided on the side of the seed dispensing area near the orifice wheel 3. The seed pusher 18, located below the outer casing 8, faces the orifice wheel 3. The seed pusher slide groove 8012 of the outer casing 8 and the seed pusher slide plate 1802 of the seed pusher 18 are fitted with a clearance. At the same time, the seed pusher mounting hole 8015 and the seed pusher positioning hole 1803 are fixed by bolts to achieve complete positioning of the seed pusher 18. Multiple parallel seed pusher protrusions 1801 are provided. The seed pusher protrusions 1801 are inserted into the seed pusher slide groove 304. The number of seed pusher protrusions 1801 is the same as the number of seed pusher slide grooves 304.

[0052] The two sides of the second damping hinge (not shown in the figure) are respectively connected and fixed to the second damping hinge mounting hole 203 on the seed protection brush base 2 and the second damping hinge mounting hole 8014 on the outer shell 8 by bolts, so as to realize the installation of the seed protection brush base 2 and its free opening and closing; the bristle mounting plate of the seed protection brush 4 is fixed to the seed protection brush mounting groove 201 of the seed protection brush base 2, and the bristles of the seed protection brush 4 are pressed on the surface of the shaped hole wheel 3; when the quantitative seed feeder is in operation, the seed protection brush base positioning hole 202 on one side of the seed protection brush base 2 and the upper seed protection brush base mounting hole 8016 on the outer shell 8 are fixed with bolts to realize the complete fixation of the seed protection brush base and prevent the base from moving during operation;

[0053] The cover plate 1 is fixed by bolts through 7 cover plate mounting holes 801 and cover plate positioning holes 101; the front and rear limiting plates 8021 of the outer shell are provided with vertical limiting holes 806, and the vertical limiting plate 8018 of the outer shell is provided with horizontal limiting holes 8017. The vertical limiting holes 806 and horizontal limiting holes 8017 are used to fix the outer shell to the seeder frame (the implement is a seeder), ensuring the complete positioning of the outer shell 8.

[0054] In this embodiment, a housing center boss 8019 extends outward from the bearing mounting hole 804. The first bearing 12 is installed in the housing center boss 8019. The housing center boss 8019 and the bearing mounting hole 804 are separated by an annular portion, thereby separating the first bearing 12 and the second bearing 13.

[0055] like Figure 4 As shown, a central hole 102 with a radius of 61 mm is opened in the center of the cover plate 1. The central hole 102 of the cover plate is clearance-fitted with the shaped hole wheel 3. After installation, one end face of the shaped hole wheel 3 is inserted into the central hole 102 of the cover plate, which facilitates the disassembly of the shaped hole wheel 3.

[0056] like Figure 6 As shown, the diameter of the shaped wheel 3 is 120 mm, and the height of the shaped wheel boss 301 is 2 mm. During assembly, the shaped wheel boss 301 abuts against the inner ring of the second bearing, reducing the frictional force of the shaped wheel 3 during rotation.

[0057] Along the outer circumference of the perforating wheel 3, three rings of spoon-shaped perforations 302 are evenly spaced. Each spoon-shaped perforation 302 in each ring is connected by a seed-pushing groove 304. Between each ring of spoon-shaped perforations 302 is a seed-guiding groove 303, which faces the central ring of spoon-shaped perforations 302. The strip-shaped seed-guiding grooves 303 are used to disturb the seed population and guide the seeds towards the perforations, thus improving the fluidity of the seed population and the filling effect of the seeds. Figure 4As shown, the maximum depth of the spoon-shaped hole 302 is 6.5 mm, the spherical radius is 6.5 mm, and the radius of the front end gradually changes from 0 mm to 5 mm. Each ring of spoon-shaped holes 302 has 20 holes evenly distributed, for a total of 60 holes; the tips of the spoon-shaped holes 302 in each ring (the spoon shape has both a tip and a rounded part) face the same direction, and the tips of adjacent rings of spoon-shaped holes 302 are staggered with an intersection angle of 6°.

[0058] like Figure 5 As shown and Figure 6 As shown, the bristles of the seed protection brush 4 and the bristles of the seed cleaning brush 6 are both made of nylon material, with an overall thickness of 10 mm. The length of the seed protection brush bristles is 75 mm, and the length of the seed cleaning brush bristles is 15 mm.

[0059] like Figure 1 , Figure 13 and Figure 16 As shown, the seed supply collection device includes: a seed supply detection sensor transmitter plate 15 and a seed supply detection sensor receiver plate 20. The seed supply detection sensor transmitter plate 15 is connected to the seed measuring box 23 by a bolt group. The transmitter plate positioning hole 1501 and the transmitter plate mounting hole 1905 of the seed supply detection sensor transmitter plate 15 are installed by the first bolt group. The infrared emitting tube 1502 is located within the accommodating space of the sensor positioning through hole 1901.

[0060] The seed supply quantity detection sensor receiving board 20 and the seed measuring box 23 are also connected by bolts. The receiving board positioning hole 2001 and the receiving board mounting hole 1902 of the seed supply quantity detection sensor receiving board 20 are fixed by the second bolt group. The infrared receiving tube 2002 is also located within the space of the sensor positioning through hole 1901. The seed supply quantity detection sensor emitting board 15 is arranged opposite to the seed supply quantity detection sensor receiving board 20. The infrared emitting tube 1502 and the infrared receiving tube 2002 are arranged in an array to form a light curtain. When a seed passes through the light curtain area, the intensity of the infrared light received by the infrared receiving tube 2002 decreases and the resistance increases. The voltage across the receiving board voltage divider resistor 2003 connected in series with it decreases. The MCU (microcontroller) obtains the signal through the ADC (digital-to-analog converter) acquisition path and counts the seed supply quantity in real time.

[0061] The working process of this invention is as follows:

[0062] The seed supply motor is connected to the shaft 10 of the quantitative seed supply device via a coupling, driving the shaft 10 to rotate counterclockwise. The shaft 10 is connected to the shaped hole wheel 3 via a flat key 16, driving the shaped hole wheel 3 to move. During the filling stage, seeds fall into the spoon-shaped orifice 302 under their own gravity and the force of the population. During the cleaning stage, excess seeds in the orifice are removed by the combined action of centrifugal force, gravity, and the cleaning brush, ensuring that each orifice can only hold a single seed. During the carrying stage, the seed-protecting brush 4 presses against the surface of the orifice wheel 3 to support the seeds remaining in the orifice and prevent them from falling out. During the sowing stage, the seeds to be sown lose the support of the seed-protecting brush, detach from the orifice wheel 3, and enter the seed collection box 19. When the seeds pass through the light curtain formed by the seed supply detection sensor transmitter plate 15 and the seed supply detection sensor receiver plate 20, they block the infrared rays emitted by the infrared transmitter tube 1502, causing a level transition in the receiver plate circuit. The main control chip calculates the seed supply by collecting and counting the number of level transitions. Then, based on the sowing amount at different speeds and the seed supply detection, the speed of the seed supply motor is controlled to achieve dynamic control of the seed supply. During the seed supply process, if a seed gets stuck in the spoon-shaped hole 302 and cannot fall out, the seed pusher 18 can effectively complete the active seed pushing task and push the stuck seed out.

Claims

1. A quantitative seed supply system for a centrifugal precision seed metering system for corn, characterized in that, include: The quantitative seed feeder (24), the centrifugal seed metering device (22), and the connecting pipe (21) are provided. The quantitative seed feeder (24) includes: a cover plate (1), a perforated wheel (3), an outer shell (8), a shaft (10), a seed collection box (19), a seed measuring box (23), and a control system. The outer shell (8) and the cover plate (1) are fixedly connected. The shaft hole (305) of the perforated wheel (3) is connected to the shaft (10) by a key. The shaft (10) is connected to the outer shell (8) by a bearing. One end of the shaft (10) is connected to the power output of the seed supply motor. The perforated wheel (3) divides the area enclosed by the outer shell (8) and the cover plate (1) into an upper seed storage area and a lower seed dispensing area. The lower opening of the seed dispensing area is sequentially connected to the seed measuring box (23), the seed collection box (19), the connecting pipe (21), and the seed inlet of the centrifugal seed metering device (22). The seed metering box (23) is equipped with a seed supply collection device. The seed supply collection device is connected to the quantity collection module of the control system. The quantity collection module interacts with the speed confirmation module. The speed confirmation module is connected to the machine speed gauge to obtain the real-time speed and send it to the quantity collection module. The quantity collection module obtains the machine movement speed in real time according to the output formula and calculates the unit seed discharge of the centrifugal seed meterer (22) at the current machine movement speed. It compares the real-time seed supply quantity sent by the seed supply collection device with the real-time seed supply quantity. If the real-time seed supply quantity is greater than the unit seed discharge quantity, a deceleration signal is sent to the seed supply motor. Otherwise, an acceleration signal is sent to the seed supply motor. The number collection module of the control system is also connected to the seed accumulation height sensor in the seed chamber of the centrifugal seed meterer (22). If the seed accumulation height sensor sends back a signal, it is considered as a sudden blockage, and a stop signal is sent to the seed supply motor drive module to first stop the rotation of the seed supply motor, and then restart the seed supply motor to the speed before stopping. The quantitative seed feeder (24) also includes: a seed-protecting brush base (2), a seed-protecting brush (4), a screw (5), a seed-cleaning brush (6), a population height adjustment plate (7), a first damping hinge (9), a second damping hinge (11), a first bearing (12), a second bearing (13), a seed unloading baffle (14), a seed supply collection device key (16), a gasket (17), and a seed pusher (18); the outer shell (8) is the base frame for installing other parts. The bearing mounting hole (804) in the shaft is used to install the first bearing (12) and the second bearing (13). The shaft (10) is transitionally fitted with the first bearing (12) and the second bearing (13). The bristle mounting plate of the seed cleaning brush (6) is connected to the seed cleaning brush mounting groove (803) by the third bolt. The bristles of the seed cleaning brush (6) are pressed on the surface of the shaped hole wheel (3). The height of the seed cleaning brush (6) from the shaped hole wheel (3) is adjusted by the third bolt to achieve different seed cleaning intensities. The adjustment plate pull hole (701) of the population height adjustment plate (7) is located outside the outer shell (8). The middle part of the population height adjustment plate (7) passes through the adjustment plate mounting groove (802) on the upper part of the outer shell (8). The adjustment plate positioning side plate (702) of the population height adjustment plate (7) is connected to the adjustment plate mounting groove (805) of the outer shell (8) through the adjustment plate fixing bolt group. The adjustment plate mounting groove (805) is located on one side of the breeding area. The adjustment plate sliding boss (703) of the population height adjustment plate (7) is inserted into the adjustment plate sliding groove (103) on the other side of the breeding area and slides in the adjustment plate sliding groove (103). One side of the first damping hinge (9) is fixed to the mounting hole (807) on the first damping hinge by bolts, and the other side of the first damping hinge (9) is fixed to the mounting hole on the seed discharge baffle (14) on the lower part of the first damping hinge. The seed discharge baffle (14) blocks the seed discharge port (808). When seed discharge is required, the damping of the first damping hinge (9) is reduced, and the seed discharge port (808) is opened by pulling the pull ring (1402) on the seed discharge baffle (14) to discharge the seeds in the quantitative seed feeder. Along the outer periphery of the perforated wheel (3), there are three rings of spoon-shaped holes (302) at equal intervals. Each of the spoon-shaped holes (302) in each ring is connected by a seed pushing groove (304). A seed guiding groove (303) is provided between each ring of spoon-shaped holes (302). The seed guiding groove (303) faces the central ring of spoon-shaped holes (302). The strip-shaped seed guiding groove (303) is used to disturb the population and guide the seeds to move towards the perforated holes, which is beneficial to improving the mobility of the population and the filling effect of the seeds. A seed pusher (18) is provided on the side of the seed dispensing area near the shaped hole wheel (3). The seed pusher (18) located below the outer shell (8) faces the shaped hole wheel (3). The seed pusher slide groove (8012) of the outer shell (8) and the seed pusher slide plate (1802) of the seed pusher (18) are fitted with a clearance. At the same time, the seed pusher mounting hole (8015) and the seed pusher positioning hole (1803) are fixed by bolts to achieve complete positioning of the seed pusher (18). Multiple parallel seed pusher bosses (1801) are provided. The seed pusher bosses (1801) are inserted into the seed pusher slide groove (304). The number of seed pusher bosses (1801) is the same as the number of seed pusher slide grooves (304).

2. The quantitative seed supply system of a centrifugal maize precision seed metering system according to claim 1, characterized in that, The seed collection box slide (8013) is provided on both sides of the lower opening of the seed distribution area of ​​the outer shell (8). The seed measuring box slide (1903) of the seed measuring box (23) cooperates with the seed collection box slide (8013), which restricts the vertical freedom of the seed measuring box (23) and the seed collection box (19). The seed measuring box positioning hole (1904) of the seed measuring box (23) is fixed to the seed measuring box mounting hole (8011) by bolts. The two sides of the second damping hinge are respectively connected and fixed to the mounting holes (203) on the second damping hinge of the seed protection brush base (2) and the mounting holes (8014) on the second damping hinge of the outer shell (8) by bolts, so as to realize the installation of the seed protection brush base (2) and free opening and closing; the bristle mounting plate of the seed protection brush (4) is fixed to the seed protection brush mounting groove (201) of the seed protection brush base (2), and the bristles of the seed protection brush (4) are pressed on the surface of the shaped hole wheel (3); when the quantitative seed feeder is in operation, the seed protection brush base positioning hole (202) on one side of the seed protection brush base (2) and the seed protection brush base mounting hole (8016) on the outer shell (8) are fixed by bolts.

3. The quantitative seed supply system of a centrifugal corn precision seed metering system according to claim 1, characterized in that, The cover plate (1) is fixed by bolts through the cover plate mounting hole (801) and the cover plate positioning hole (101); the front and rear limiting plates (8021) of the outer shell are provided with vertical limiting holes (806) and the vertical limiting plate (8018) of the outer shell are provided with horizontal limiting holes (8017). The vertical limiting holes (806) and the horizontal limiting holes (8017) of the outer shell are used to fix it to the frame of the seeder.

4. The quantitative seed supply system of a centrifugal corn precision seed metering system according to claim 1, characterized in that, The outer side of the bearing mounting hole (804) extends a housing center boss (8019), and the first bearing (12) is installed in the housing center boss (8019). The housing center boss (8019) and the bearing mounting hole (804) are separated by an annular portion, thereby separating the first bearing (12) and the second bearing (13).

5. The quantitative seed supply system of a centrifugal corn precision seed metering system according to claim 1, characterized in that, The cover plate (1) has a central hole (102) with a radius of 61 mm. The central hole (102) is fitted with the shaped hole wheel (3) with a clearance. After installation, one end face of the shaped hole wheel (3) is inserted into the central hole (102) of the cover plate.

6. The quantitative seed supply system of a centrifugal maize precision seed metering system according to claim 1, characterized in that, The diameter of the shaped wheel (3) is 120 mm and the height of the shaped wheel boss (301) is 2 mm. The shaped wheel boss (301) presses against the inner ring of the second bearing, reducing the friction of the shaped wheel (3) rotation.

7. The quantitative seed supply system of a centrifugal corn precision seed metering system according to claim 6, characterized in that, The maximum depth of the spoon-shaped hole (302) is 6.5 mm, the spherical radius is 6.5 mm, and the radius of the front end gradually changes from 0 mm to 5 mm; each circle of spoon-shaped holes (302) is uniformly provided with 20 holes, for a total of 60 holes; the tips of the spoon-shaped holes (302) in each circle face the same direction, and the tips of adjacent circles of spoon-shaped holes (302) are staggered with an intersection angle of 6°.

8. The quantitative seed supply system of a centrifugal corn precision seed metering system according to claim 1, characterized in that, The seed protection brush (4) and the seed cleaning brush (6) are both made of nylon material, with an overall thickness of 10 mm. The length of the seed protection brush is 75 mm, and the length of the seed cleaning brush is 15 mm.

9. The quantitative seed supply system of a centrifugal maize precision seed metering system according to claim 1, characterized in that, The seed supply collection device includes: a seed supply detection sensor transmitter plate (15) and a seed supply detection sensor receiver plate (20). The seed supply detection sensor transmitter plate (15) and the seed measuring box (23) are connected by a bolt group. The transmitter plate positioning hole (1501) and the transmitter plate mounting hole (1905) of the seed supply detection sensor transmitter plate (15) are installed by the first bolt group. The infrared emitting tube (1502) is located within the space of the sensor positioning through hole (1901). The seed supply quantity detection sensor receiving board (20) and the seed measuring box (23) are also connected by bolts. The receiving board positioning hole (2001) and the receiving board mounting hole (1902) of the seed supply quantity detection sensor receiving board (20) are fixed by the second bolt group. The infrared receiving tube (2002) is also located within the space of the sensor positioning through hole (1901). The seed supply quantity detection sensor emitting board (15) and the seed supply quantity detection sensor receiving board (20) are arranged opposite each other. The infrared emitting tube (1502) and the infrared receiving tube (2002) are arranged in an array to form a light curtain. When a seed passes through the light curtain area, the intensity of the infrared light received by the infrared receiving tube (2002) decreases and the resistance increases. The voltage across the receiving board voltage divider resistor (2003) connected in series with it decreases. The MCU obtains the signal through the ADC acquisition path and counts the seed supply quantity in real time.

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