A high-speed precision air-suction corn seed metering device that actively promotes seed placement

Abstract

The present invention belongs to the field of agricultural machinery and relates to an air-suction high-speed precision seeding device for corn with active seed drop promotion, which is mainly composed of an air chamber shell, a seeding disk, a pressure plate, a front shell, a pressure-regulating bolt and nut, and an active seed drop promotion module; the active seed drop promotion module of the present invention is provided with a brush wheel and a DC motor, and the brush wheel is driven to rotate by the DC motor to brush the corn seeds on the seed suction holes transported to the seeding area onto the seed guide tube, thereby achieving the effect of actively promoting seed drop, ensuring that the time interval, speed direction and speed of seed drop before seeding are consistent, effectively reducing the difference in seed spacing during high-speed sowing, and improving the consistency of plant spacing; at the same time, in the active seed drop promotion module, the brush wheel diameter can be fine-tuned by a double slider mechanism to ensure that the same seed drop promotion effect is achieved for corn seeds of different varieties and different sizes, thereby improving the adaptability of the seeding device.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural machinery, and in particular relates to an air-suction type high-speed precision seed metering device for corn that actively promotes seed placement. Background Art

[0002] Air-suction seeding devices have many advantages, such as high sowing accuracy, no strict requirements on seed size, strong adaptability and the ability to operate at high speed. They are widely used in high-speed precision sowing of corn. However, traditional air-suction corn high-speed precision seeding devices still have problems during operation, which mainly manifest in the seed drop stage before sowing: after the airflow between the seeds and the seed suction is blocked, the seeds rely on gravity to separate from the seed plate and drop passively. Due to the irregular shape of corn seeds, their posture when adsorbed to the seed suction holes is uncertain, and the airflow through the seed suction holes is not completely blocked, resulting in inconsistent time intervals for the seeds to separate from the seed suction holes and fall, and inconsistent speed directions, which in turn leads to inconsistent time intervals and speed directions for sowing. When operating at high speed, the sowing time interval is short. The above inconsistency significantly amplifies the difference in seed spacing during sowing, seriously affecting the consistency of plant spacing. Therefore, there is an urgent need for an air-suction corn high-speed precision seeding device that can ensure consistent seed drop. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem of inconsistency between the time interval and speed direction of seed dropping during operation of the traditional air-suction corn high-speed precision seed metering device described in the technical background, and to provide an air-suction corn high-speed precision seed metering device that actively promotes seed dropping. The present invention is provided with an active seed dropping module, which is equipped with a brush wheel and a DC motor. The brush wheel is driven by the DC motor to rotate, and the corn seeds on the seed suction hole are brushed off to the seed guide tube, thereby achieving the effect of actively promoting seed dropping, ensuring that the time interval, speed direction and speed of seed dropping are consistent, effectively reducing the difference in seed spacing during high-speed sowing, and improving the consistency of plant spacing. At the same time, in the active seed dropping module, the brush wheel diameter can be fine-tuned by a double slider mechanism to ensure that the same seed dropping effect is achieved for corn seeds of different varieties and sizes, thereby improving the adaptability of the seed metering device.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: an air-suction high-speed precision seed metering device for corn with active seed drop promotion, characterized in that it mainly comprises an air chamber housing 1, a seeding disc 2, a pressure plate 3, a front housing 4, a pressure-regulating bolt and nut 5, and an active seed drop promotion module 6;

[0005] The air chamber housing 1 includes an air chamber 11, a negative pressure air inlet 12 and a sealing sleeve 13, wherein the air chamber 11 is located on the back of the air chamber housing 1 and is in the shape of an annular protrusion. A negative pressure air inlet 12 is provided at the end of the air chamber 11, and the latter is externally connected to a negative pressure device to form a negative pressure environment in the air chamber, which is convenient for sucking and carrying seeds. The sealing sleeve 13 is flexible and is located on the front of the air chamber housing 1, at the outer circle of the air chamber 11. The front of the air chamber housing 1 is coaxially fitted with the back of the seed disc 2;

[0006] The seeding disc 2 includes seed suction holes 21 and a drive shaft 22. The seed suction holes 21 are circular through holes and are evenly arranged near the outer periphery on the front of the seeding disc 2. There are 22 of them in total. The drive shaft 22 is located on the front of the seeding disc 2 and is fixed to the center of the latter.

[0007] The pressure plate 3 includes a pressure plate through hole 31 and a pressure regulating bolt through hole 32. The front of the pressure plate 3 is in the shape of a truncated cone and the back is in the shape of a circular ring. The back of the pressure plate is coaxially aligned with the front of the seed disc 2. The pressure plate through hole 31 passes through the drive shaft 22, and the diameter of the former is larger than the latter, so the two will not contact each other.

[0008] The front housing 4 includes a seed chamber 41, a pressure regulating bolt mounting hole 42, a drive shaft hole 43, a motor mounting hole 44, a motor shaft hole 45, a seed cleaning piece 46, a partition 47, a seed guide tube 48, a positive pressure air intake pipe 49, a bearing 410 and a seed drop port 411. The seed chamber 41 is located at the lower left of the front of the front housing 4 and is connected to the back of the front housing 4 for placing corn seeds to be sown. The drive shaft hole 43 is located at the center of the front housing 4. The seed cleaning piece 46 is set On the outer edge line of the semicircular wall inside the front shell 4, it fits with the front surface of the seed disc 2, and there is a distance slightly larger than the radius of the seed suction hole from the circle formed by the centers of all the seed suction holes, so that the excess seeds on the seed suction holes 21 of the seed disc 2 can be scraped back to the seed filling area. The seed guide tube 48 maintains a vertical posture as a whole, is fixedly connected to and communicated with the seed drop port 411, and the top of the seed guide tube 48 is communicated with the positive pressure air inlet pipe 49, which is externally connected to a positive pressure device for blowing seeds when sowing;

[0009] The front shell 4 is coaxially fixed to the air chamber shell 1 to form a seeding device shell together. The partition 47 is fitted with the front of the seeding disc 2. The upper part of the partition 47 is a rectangular thin wall with a notch. The notch can allow the seed suction hole 21 to carry corn seeds through. The middle part is a semi-circular thin wall, and the lower part is a rectangular thin wall. The middle and lower parts of the partition 47, the seeding disc 2, the front surface of the air chamber shell 1 and the side walls of the air chamber shell 1 together constitute the seed filling area. The drive shaft 22 passes through the external drive device from the drive shaft hole 43, and the front The front housing 4 is rotatably connected to the front housing 4 through a bearing 410. Four pressure-adjusting bolts 51 pass through four pressure-adjusting bolt mounting holes 42 and four pressure-adjusting bolt through holes 32 on the front side of the front housing 4 to constrain the rotational movement of the pressure plate 3. Four nuts 52 are respectively located on the four pressure-adjusting bolts 51 and are located between the front housing 4 and the pressure plate 3. By tightening the nuts 52 toward the pressure plate 3, the pressure of the pressure plate 3 on the seeding disc 2 is adjusted, thereby making the seeding disc 2 fit tightly with the sealing sleeve 13 to ensure the air tightness of the air chamber 11.

[0010] The active seed drop module 6 includes a DC motor 61, a motor bolt 62, a motor output shaft 63, a brush wheel sleeve 64, a slot 65, a variable diameter sleeve 66, a buckle 67, a variable diameter brush wheel 68, a telescopic slider 69, a slide 610, a fixed shaft I 611, a fixed shaft II 612 and a connecting rod 613. The four motor bolts 62 pass through the four motor mounting holes 44 from the inside to the outside to fix the DC motor 61 to the front of the front housing 4. The motor output shaft 63 passes through the motor shaft hole 45 from the outside to the inside and is aligned with the brush wheel sleeve 64. The axis is fixed, and the reducing sleeve 66 is sleeved on the outside of the brush wheel sleeve 64. The inner surface of the former is provided with a buckle 67, and the outer surface of the latter is provided with a plurality of slots 65. When the buckle 67 is located in the slot 65, the reducing sleeve 66 is fixed to the outside of the brush wheel sleeve 64. When the reducing sleeve 66 is pulled axially, the buckle 67 will break away from the current slot and enter the adjacent slot. The reducing sleeve 66 then moves a certain distance axially and is fixed to the outside of the brush wheel sleeve 64 again. Three circumferentially evenly distributed screws are provided at the lower outer side of the reducing sleeve 66. The fixed shaft Ⅰ 611, the two form a fixed connection relationship, the variable diameter brush wheel 68 is divided into three arc-shaped rings disconnected from each other, each section angle is 120 °, the outer ring surface is a tightly arranged flexible brush, the upper side of the inner ring surface is provided with three telescopic sliders 69 evenly distributed along the circumference, the latter is provided with three fixed shafts Ⅱ 612 above, the three sequentially form a fixed connection relationship, the three connecting rods 613 through the through holes at both ends thereof are respectively connected to the three fixed shafts Ⅰ 611, the three fixed shafts Ⅱ 612 form a rotational connection, the lower part of the brush wheel sleeve 64 is provided with three The slideways 610 are evenly distributed along the circumference, and the direction of the slideways 610 is the same as the radial direction of the brush wheel sleeve 64. The three telescopic sliders 69 are respectively located in the three slideways 610. In this way, the variable diameter sleeve 66, the connecting rod 613 and the variable diameter brush wheel 68 constitute a double slider mechanism. When the variable diameter sleeve 66 moves axially upward (downward), the connecting rod 613 rotates inward (outward) with the fixed shaft I 611, thereby driving the variable diameter brush wheel 68 to shrink inward (deepen outward), thereby reducing (increasing) the outer diameter of the variable diameter brush wheel 68.

[0011] Furthermore, the motor shaft hole 45 is located on the right side of the front surface of the front housing 4, and the line connecting the center of the motor shaft hole 45 and the center of the drive shaft hole 43 is parallel to the horizontal plane.

[0012] Furthermore, there is a small gap of 1 to 3 mm between the variable diameter brush wheel 68 and the seed disc 2 .

[0013] Furthermore, the buckle 67 has a certain elasticity.

[0014] Furthermore, the rotation direction of the DC motor 61 is consistent with the rotation direction of the seed disc 2, and the rotation speed is 60-120 r / min.

[0015] Furthermore, the seed drop port 411 is located in the lower half of the air chamber housing 1, and the angle between its axis and the horizontal plane where the center of the drive shaft hole 43 is located is 5°.

[0016] Compared with the prior art, the beneficial effect of the present invention is that the corn seeds located on the seed suction holes of the seeding disc and transported to the seeding area are actively brushed into the seed guide tube by the rotation of the brush wheel driven by a DC motor in the active seeding module, thereby achieving the effect of promoting seeding. In this way, the time interval, speed and direction of seeding are guaranteed to be consistent. Combined with the air blowing of the seed guide tube, the difference in seed spacing during high-speed sowing can be effectively reduced, and the consistency of plant spacing can be improved. At the same time, the module can fine-tune the diameter of the brush wheel through the internal double slider mechanism to ensure that the same seeding effect is achieved for corn seeds of different varieties and sizes, thereby improving the adaptability of the seed meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An exploded view of the present invention;

[0018] Figure 2 is a side sectional view of the present invention;

[0019] Figure 3 It is a structural diagram of the air chamber shell;

[0020] Figure 4a This is a front structural diagram of the front shell;

[0021] Figure 4b This is a structural diagram of the back side of the front shell;

[0022] Figure 5a This is a schematic diagram of the layout of the active seeding promotion module;

[0023] Figure 5b This is an enlarged schematic diagram of the layout of the active seed drop promotion module;

[0024] Figure 6 Schematic diagram of the double slider mechanism;

[0025] Figure 7 This is the brush wheel sleeve structure diagram;

[0026] Figure 8 This is an enlarged schematic diagram of the layout of the buckle and slot;

[0027] Figure 9a This is a schematic diagram showing the reduction of the outer diameter of the brush wheel;

[0028] Figure 9b Schematic diagram of the increase in outer diameter of the brush wheel.

[0029] Description of reference numerals:

[0030] In the figure, 1 is an air chamber shell, 11 is an air chamber, 12 is a negative pressure air inlet, 13 is a sealing sleeve, 2 is a seed plate, 21 is a seed suction hole, 22 is a drive shaft, 3 is a pressure plate, 31 is a pressure plate through hole, 32 is a pressure regulating bolt through hole, 4 is a front shell, 41 is a seed chamber, 42 is a pressure regulating bolt mounting hole, 43 is a drive shaft hole, 44 is a motor mounting hole, 45 is a motor shaft hole, 46 is a seed cleaning piece, 47 is a partition, 48 is a seed guide tube, 49 is a positive pressure air inlet pipe, 410 is a bearing, 411 is a seed drop port, 5 is a pressure regulating bolt and nut, 51 is a pressure regulating bolt, 52 is a nut, 6 is an active seed drop module, 61 is a DC motor, 62 is a motor bolt, 63 is a motor output shaft, 64 is a brush wheel sleeve, 65 is a slot, 66 is a reducing sleeve, 67 is a buckle, 68 is a variable diameter brush wheel, 69 is a telescopic slider, 610 is a slide, 611 is a fixed shaft I, 612 is a fixed shaft II, and 613 is a connecting rod. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments (for the convenience of description and understanding, the following Figure 9a The upper part is the upper part of the active seed drop module. Figure 1 The above is the description of other contents).

[0032] like Figure 1 The exploded view of the present invention and Figure 2 As shown in the side sectional view of the present invention, an air-suction high-speed precision seeding device for corn with active seed dropping is characterized in that it mainly includes an air chamber shell 1, a seeding plate 2, a pressure plate 3, a front shell 4, a pressure-regulating bolt and nut 5 and an active seed dropping module 6.

[0033] like Figure 1 The exploded view of the present invention and Figure 3 As shown in the air chamber shell structure diagram, the air chamber shell 1 includes an air chamber 11, a negative pressure air inlet 12 and a sealing sleeve 13, wherein the air chamber 11 is located on the back of the air chamber shell 1 and is in the shape of an annular convexity. A negative pressure air inlet 12 is provided at the end of the air chamber 11, and the latter is externally connected to a negative pressure device to form a negative pressure environment in the air chamber, which is convenient for sucking and carrying seeds. The sealing sleeve 13 is flexible and is located on the front of the air chamber shell 1, at the outer circle of the air chamber 11. The front of the air chamber shell 1 is coaxially fitted with the back of the seed disc 2.

[0034] like Figure 1 As shown in the exploded view of the present invention, the seed disc 2 includes seed suction holes 21 and a drive shaft 22. The seed suction holes 21 are circular through holes and are evenly arranged near the outer periphery on the front of the seed disc 2. There are 22 of them in total. The drive shaft 22 is located on the front of the seed disc 2 and is fixed to the center of the latter.

[0035] like Figure 1As shown in the exploded view of the present invention, the pressure plate 3 includes a pressure plate through hole 31 and a pressure regulating bolt through hole 32. The front of the pressure plate 3 is in the shape of a cone and the back is in the shape of a ring. The back of the pressure plate is coaxially fitted with the front of the seed disc 2. The pressure plate through hole 31 passes through the drive shaft 22, and the diameter of the former is larger than that of the latter, so the two will not contact.

[0036] like Figure 4a The front structure diagram of the front shell Figure 4b As shown in the back structure diagram of the front shell, the front shell 4 includes a seed chamber 41, a pressure regulating bolt mounting hole 42, a drive shaft hole 43, a motor mounting hole 44, a motor shaft hole 45, a seed cleaning piece 46, a partition 47, a seed guide tube 48, a positive pressure air intake pipe 49, a bearing 410 and a seed drop port 411. The seed chamber 41 is located at the lower left of the front of the front shell 4 and is connected to the back of the front shell 4 for placing corn seeds to be sown. The drive shaft hole 43 is located at the center of the front shell 4. The seed piece 46 is arranged on the outer ring edge line of the semicircular wall inside the front shell body 4, fits with the front of the seed plate 2, and has a distance slightly larger than the radius of the seed hole from the circle formed by the center of all the seed suction holes. The excess seeds on the seed suction holes 21 of the seed plate 2 can be scraped back to the seed filling area. The seed guide tube 48 maintains a vertical posture as a whole, is fixedly connected and communicated with the seed drop port 411, and the top of the seed guide tube 48 is communicated with the positive pressure air inlet pipe 49, which is externally connected to a positive pressure device for blowing seeds when sowing.

[0037] like Figure 2 As shown in the side sectional view of the present invention, the front shell 4 is coaxially fixed to the air chamber shell 1 to form a seeding device shell together. The partition 47 is fitted with the front of the seeding disc 2. The upper part of the partition 47 is a rectangular thin wall with a notch. The notch can allow the seed suction hole 21 to carry corn seeds through. The middle part is a semi-circular thin wall, and the lower part is a rectangular thin wall. The middle and lower parts of the partition 47, the seeding disc 2, the front surface of the air chamber shell 1 and the side wall of the air chamber shell 1 together constitute the seed filling area. The drive shaft 22 passes through the external drive shaft hole 43. Driving device, the former is rotationally connected with the front shell body 4 through the bearing 410, and the four pressure-adjusting bolts 51 pass through the four pressure-adjusting bolt mounting holes 42 and the four pressure-adjusting bolt through holes 32 from the front side of the front shell body 4 to constrain the rotational movement of the pressure plate 3. The four nuts 52 are respectively located on the four pressure-adjusting bolts 51 and are located between the front shell body 4 and the pressure plate 3. The pressure of the pressure plate 3 on the seeding disc 2 is adjusted by tightening the nuts 52 toward the pressure plate 3, so that the seeding disc 2 is tightly fitted with the sealing sleeve 13 to ensure the air tightness of the air chamber 11.

[0038] like Figure 5a Schematic diagram of the layout of the active seeding promotion module Figure 5bAs shown in the enlarged schematic diagram of the layout position of the active seed drop module, the active seed drop module 6 includes a DC motor 61, a motor bolt 62, a motor output shaft 63, a brush wheel sleeve 64, a slot 65, a reducing sleeve 66, a buckle 67, a variable diameter brush wheel 68, a telescopic slider 69, a slide 610, a fixed shaft I 611, a fixed shaft II 612 and a connecting rod 613. The four motor bolts 62 pass through the four motor mounting holes 44 from the inside to the outside to fix the DC motor 61 to the front of the front housing 4. The motor output shaft 63 passes through the motor shaft hole 45 from the outside to the inside and is coaxially fixed to the brush wheel sleeve 64. The reducing sleeve 66 is sleeved on the outside of the brush wheel sleeve 64. The inner surface of the former is provided with a buckle 67, and the outer surface of the latter is provided with a plurality of slots 65, as shown in FIG. Figure 8 As shown in the enlarged schematic diagram of the arrangement of the buckle and slot, when the buckle 67 is located in the slot 65, the reducing sleeve 66 is fixed to the outside of the brush wheel sleeve 64. When the reducing sleeve 66 is pulled axially, the buckle 67 will break away from the current slot and enter the adjacent slot. The reducing sleeve 66 then moves axially for a certain distance and is fixed to the outside of the brush wheel sleeve 64 again. Figure 6 Schematic diagram of the double slider mechanism and Figure 7 As shown in the brush wheel sleeve structure diagram, three fixed shafts I 611 uniformly distributed along the circumferential direction are provided at the lower outer side of the variable diameter sleeve 66, and the two constitute a fixed connection relationship. The variable diameter brush wheel 68 is divided into three arc-shaped circular rings disconnected from each other, and the angle of each section is 120°. Its outer ring surface is a tightly arranged flexible brush, and its inner ring surface is provided with three telescopic sliders 69 uniformly distributed along the circumferential direction. The latter is provided with three fixed shafts II 612 above, and the three constitute a fixed connection relationship in turn. The three connecting rods 613 are respectively connected to the three fixed shafts I 611 and the three fixed shafts II 612 through the through holes at both ends thereof. The lower part of the brush wheel sleeve 64 is provided with three slideways 610 uniformly distributed along the circumferential direction. The direction of the slideway 610 is the same as the radius direction of the brush wheel sleeve 64, as shown in FIG. Figure 6 Schematic diagram of the double slider mechanism, Figure 9a Schematic diagram of brush wheel outer diameter reduction and Figure 9b As shown in the schematic diagram of the increase in the outer diameter of the brush wheel, the three telescopic sliders 69 are respectively located in the three slideways 610. In this way, the variable diameter sleeve 66, the connecting rod 613 and the variable diameter brush wheel 68 constitute a double slider mechanism. When the variable diameter sleeve 66 moves axially upward (downward), the connecting rod 613 rotates inward (outward) with the fixed shaft I 611, thereby driving the variable diameter brush wheel 68 to shrink inward (draw outward), thereby realizing the reduction (increase) of the outer diameter of the variable diameter brush wheel 68.

[0039] The invention is suitable for high-speed and precise seeding of corn.

[0040] During use: the corn seeds to be sown in the seed chamber 41 enter the seed filling area, the external negative pressure device draws air from the air chamber 11 through the negative pressure air inlet 12 to form a negative pressure inside the latter to adsorb the corn seeds to the seed suction hole 21 to complete the seed filling process, and at the same time the external drive device drives the drive shaft 22 to rotate clockwise, thereby driving the seed disc 22 to rotate clockwise to complete the seed carrying process. During this process, the excess corn seeds on the seed suction hole 21 will be scraped back to the seed filling area by the seed cleaning piece 46 to avoid reseeding. At the same time, the DC motor 61 Drive the variable diameter brush wheel 68 to rotate clockwise. When the corn seeds move to the position that the variable diameter brush wheel 68 can reach along with the seed suction hole 21, they are brushed to the seed drop port 411 by the latter and then enter the seed guide tube 48. The external positive pressure device blows air into the seed guide tube 48 through the positive pressure air inlet pipe 49 to quickly blow down the corn seeds entering the seed guide tube 48 to complete the sowing process. When replacing corn seeds of different sizes, the user can change the diameter of the variable diameter brush wheel 68 by pushing and pulling the variable diameter sleeve 66 to adapt to different corn seeds.

[0041] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air-suction high-speed precision seed metering device for corn with active seed drop promotion, mainly comprising an air chamber housing (1), a seeding disc (2), a pressure disc (3), a front housing (4), a pressure-regulating bolt and nut (5), and an active seed drop promotion module (6); The air chamber housing (1) comprises an air chamber (11), a negative pressure air inlet (12) and a sealing sleeve (13), wherein: The air chamber (11) is located on the back of the air chamber shell (1) and is in the shape of an annular protrusion. A negative pressure air inlet (12) is provided at the end of the air chamber (11), and the negative pressure device is externally connected. The sealing sleeve (13) is flexible and is located on the front of the air chamber shell (1), at the outer ring of the air chamber (11). The front of the air chamber shell (1) is coaxially fitted with the back of the seeding disc (2). The seeding disc (2) comprises seed suction holes (21) and a drive shaft (22). The seed suction holes (21) are circular through holes and are evenly arranged near the outer periphery on the front of the seeding disc (2). The drive shaft (22) is located on the front of the seeding disc (2) and is fixed to the center of the latter. The pressure plate (3) includes a pressure plate through hole (31) and a pressure regulating bolt through hole (32). The front of the pressure plate (3) is in the shape of a truncated cone, and the back is in the shape of a circular ring. The back is coaxially fitted with the front of the seeding disc (2). The pressure plate through hole (31) passes through the drive shaft (22), and the diameter of the former is larger than that of the latter, so the two will not contact each other. The front housing (4) comprises a seed chamber (41), a pressure regulating bolt mounting hole (42), a drive shaft hole (43), a motor mounting hole (44), a motor shaft hole (45), a seed cleaning piece (46), a partition (47), a seed guide tube (48), a positive pressure air intake pipe (49), a bearing (410) and a seed drop port (411). The seed chamber (41) is located at the lower left of the front side of the front housing (4) and is communicated with the back side of the front housing (4). The drive shaft hole (43) is located at the lower left of the front side of the front housing (4). ) is arranged at the center of the front shell (4), the seed cleaning piece (46) is arranged on the outer ring edge line of the inner semicircular wall of the front shell (4), is in contact with the front of the seed dispensing disc (2), and has a distance from the circle formed by the centers of all the seed suction holes slightly larger than the radius of the seed suction holes. The seed guide tube (48) maintains a vertical posture as a whole, is fixedly connected to and communicates with the seed drop port (411), and the top of the seed guide tube (48) is communicated with the positive pressure air inlet pipe (49), which is externally connected to the positive pressure device; The front shell (4) is coaxially fixed to the air chamber shell (1) to form a seeding device shell together. The partition (47) is fitted with the front of the seeding disc (2). The upper part of the partition (47) is a rectangular thin wall with a notch. The notch allows the seed suction hole (21) to carry corn seeds through. The middle part is a semicircular thin wall, and the lower part is a rectangular thin wall. The middle part and the lower part of the partition (47), the seeding disc (2), the front surface of the air chamber shell (1) and the side wall of the air chamber shell (1) together form a seed filling area. The drive shaft (22) passes through the external drive device from the drive shaft hole (43). The former is connected to the external drive device through the bearing ( 410) is connected to the front housing (4) in a rotational manner. Four pressure-regulating bolts (51) are respectively passed through four pressure-regulating bolt mounting holes (42) and four pressure-regulating bolt through holes (32) on the front side of the front housing (4) to constrain the rotational movement of the pressure plate (3). Four nuts (52) are respectively located on the four pressure-regulating bolts (51) and are located between the front housing (4) and the pressure plate (3). By tightening the nuts (52) toward the pressure plate (3), the pressure of the pressure plate (3) on the seeding disc (2) is adjusted, thereby making the seeding disc (2) fit tightly with the sealing sleeve (13) to ensure the airtightness of the air chamber (11); The active seed drop promoting module (6) comprises a DC motor (61), a motor bolt (62), a motor output shaft (63), a brush wheel sleeve (64), a slot (65), a variable diameter sleeve (66), a buckle (67), a variable diameter brush wheel (68), a telescopic slider (69), a slideway (610), a fixed shaft I (611), a fixed shaft II (612) and a connecting rod (613). Four motor bolts (62) pass through four motor mounting holes (44) from inside to outside to fix the DC motor (61) to the front face of the front housing (4). The motor output shaft (63) passes through the motor shaft hole (44) from outside to inside to fix the DC motor (61) to the front face of the front housing (4). 45) is coaxially fixed with the brush wheel shaft sleeve (64), and the reducing shaft sleeve (66) is sleeved on the outside of the brush wheel shaft sleeve (64). The inner surface of the former is provided with a buckle (67), and the outer surface of the latter is provided with a plurality of slots (65). When the buckle (67) is located in the slot (65), the reducing shaft sleeve (66) is fixed on the outside of the brush wheel shaft sleeve (64). When the reducing shaft sleeve (66) is pulled axially, the buckle (67) will be separated from the current slot and enter the adjacent slot. The reducing shaft sleeve (66) is then moved axially for a certain distance and is fixed on the outside of the brush wheel shaft sleeve (64) again. The outer side of the reducing shaft sleeve (66) is located below There are three fixed shafts I (611) evenly distributed along the circumference, and the two form a fixed connection relationship. The variable diameter brush wheel (68) is divided into three arc-shaped circular rings disconnected from each other, and the angle of each section is 120 degrees. Its outer ring surface is a tightly arranged flexible brush. The upper side of its inner ring surface is provided with three telescopic sliders (69) evenly distributed along the circumference, and the upper side of the latter is provided with three fixed shafts II (612). The three form a fixed connection relationship in sequence. Three connecting rods (613) are respectively connected to the three fixed shafts I (611) and the three fixed shafts II (612) through the through holes at both ends. The lower part of the brush wheel sleeve (64) is provided with three The slideways (610) are uniformly distributed in the circumferential direction, and the direction of the slideways (610) is the same as the radial direction of the brush wheel sleeve (64). The three telescopic sliders (69) are respectively located in the three slideways (610). In this way, the variable diameter sleeve (66), the connecting rod (613) and the variable diameter brush wheel (68) constitute a double slider mechanism. When the variable diameter sleeve (66) moves upward or downward in the axial direction, the connecting rod (613) rotates inward or outward around the fixed axis I (611), thereby driving the variable diameter brush wheel (68) to shrink inward or stretch outward, thereby reducing or increasing the outer diameter of the variable diameter brush wheel (68).

2. The air-suction high-speed precision seed metering device for corn that actively promotes seed placement according to claim 1, characterized in that: The motor shaft hole (45) is located on the right side of the front face of the front housing (4), and a line connecting the center of the motor shaft hole (45) and the center of the drive shaft hole (43) is parallel to the horizontal plane.

3. The air-suction high-speed precision seed metering device for corn that actively promotes seed placement according to claim 1, characterized in that: There is a small gap of 1 to 3 mm between the variable diameter brush wheel (68) and the seeding disc (2).

4. The air-suction high-speed precision seed metering device for corn that actively promotes seed placement according to claim 1, characterized in that: The buckle (67) has a certain elasticity.

5. The air-suction high-speed precision seed metering device for corn that actively promotes seed placement according to claim 1, characterized in that: The rotation direction of the DC motor (61) is consistent with the rotation direction of the seeding disc (2), and the rotation speed is 60-120 r / min.

6. The air-suction high-speed precision seed metering device for corn that actively promotes seed placement according to claim 1, characterized in that: The seed drop port (411) is located in the lower half of the air chamber housing (1), and the angle between its axis and the horizontal plane where the center of the drive shaft hole (43) is located is 5°.

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