Electrically-controlled air-suction type seed-metering device suitable for seeding pelletized foxtail millet

Abstract

The invention discloses an electric control air suction type seed metering device suitable for seeding pelletized millet, and relates to the technical field of agricultural machinery, the electric control air suction type seed metering device comprises an air suction chamber shell, a seed metering device rear cover, a seed box and a negative pressure port, an air suction disc is fixedly installed in the air suction chamber, and a seed metering disc is rotatably installed in the seed metering device rear cover; an air suction adjusting mechanism is arranged between the air suction disc and the air suction chamber shell, a plurality of groups of suction holes with different sizes are annularly and concentrically distributed in the seed metering disc, the air suction disc is provided with an air extraction opening corresponding to the suction holes, the seed metering disc is attached to the air suction disc, and the center of the air suction disc and the air suction chamber shell are hermetically mounted through a sealing bolt and a gasket; a seed falling area is arranged on the air suction disc, and when the seed metering disc reaches the seed falling area, seeds are separated from the suction holes and fall into a seed feeding opening in the bottom of the rear cover of the seed metering device; the suction holes of various sizes are formed in the seed metering disc, and the air suction adjusting mechanism on the air suction disc is combined, so that the seeds of different sizes are sucked and discharged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural machinery, in particular to an electric control air suction type seed metering device suitable for pelletized millet seeding. BACKGROUND

[0002] Seed pelletization refers to a new seed treatment technology based on seed coating technology to meet the needs of precision seeding, which uses related seed pelletization machinery to pelletize seeds, so that the pesticide is evenly wrapped on the surface of the seeds, thereby changing the shape of the seeds, expanding the volume of the seeds, promoting seed germination and plant growth, and improving seed resistance. The pelletized seeds have a particle size of several times or even dozens of times that of the original seeds, which not only reduces environmental pollution, but also facilitates precision seeding of small seeds combined with seed metering devices.

[0003] The existing seed metering device is prone to hole blockage and poor seed uniformity during use, and has poor adaptability to seeds of different diameters. SUMMARY

[0004] The present application aims to provide an electric control air suction type seed metering device suitable for pelletized millet seeding to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] An electric control air suction type seed metering device suitable for pelletized millet seeding, comprising an air suction chamber shell and a seed metering device rear cover, a seed tank is arranged on the seed metering device rear cover, a negative pressure port is arranged on the air suction chamber shell, an air suction disc is fixedly installed in the air suction chamber shell, a seed metering disc is rotatably installed in the seed metering device rear cover, a transmission shaft is connected to the center of the seed metering disc, the transmission shaft passes through the center of the seed metering device rear cover and is connected to a transmission mechanism, an air suction adjusting mechanism is arranged between the air suction disc and the air suction chamber shell, a plurality of groups of suction holes of different sizes are arranged in a ring shape and concentrically on the seed metering disc, a suction port is arranged on the air suction disc corresponding to the suction hole, the seed metering disc and the air suction disc are arranged in close contact, the air suction chamber shell and the seed metering device rear cover are fixedly connected by bolts, the center of the air suction disc is sealingly installed between the air suction chamber shell by a sealing bolt and a gasket, sealing rubber rings are arranged between the gasket and the air suction disc and the air suction chamber shell on both sides of the gasket, a seed dropping area is arranged on the air suction disc, when the seed metering disc reaches the seed dropping area, the seeds are separated from the suction holes and fall into the seed dropping port at the bottom of the seed metering device rear cover.

[0007] As a further further scheme of the present application: the air suction adjusting mechanism comprises a plurality of sets of blocking rings concentrically arranged on the air suction disc, the blocking rings are provided with blocking heads matched with the air suction ports on the air suction disc, the blocking rings are movably arranged between the air suction disc, and the driving assembly is arranged between the blocking rings and the air suction disc, the driving assembly drives the blocking rings to move away from the air suction disc and makes the blocking heads separate from the air suction ports.

[0008] As a further further scheme of the present application: the driving assembly comprises a plurality of push air cylinders arranged on the outer circle of the air suction disc, the push air cylinders are connected with rubber rods, the air suction disc is provided with a guide frame corresponding to the positions of the rubber rods, the guide frame controls the rubber rods to point to the center of the air suction disc, the blocking rings are inserted with connecting slide columns, the connecting slide columns are fixedly connected with the air suction disc, the blocking rings and the connecting slide columns are provided with return springs, the blocking rings are provided with inclined blocks, the air suction disc is slidably arranged with a linkage rod along the radial direction, the linkage rod is provided with a vertical rod corresponding to the positions of the inclined blocks, a matching sleeve is slidably and pre-tightly arranged on the vertical rod, the matching sleeve is connected with a matching wedge block, the matching wedge block and the inclined surface of the inclined block are matched with each other, the side of the matching sleeve is provided with an electromagnetic pin, the matching sleeve is locked with the vertical rod through the electromagnetic pin, and the end of the rubber rod is connected with the outermost vertical rod.

[0009] As a further further scheme of the present application: the air suction disc is provided with arc-shaped through grooves between the air suction ports of the same size, and the same size suction holes are controlled to adsorb seeds and rotate with the seed sowing disc when the air suction disc and the seed sowing disc are matched with each other.

[0010] As a further further scheme of the present application: the seed cleaning mechanism is arranged in the seed sowing device rear cover, the seed cleaning mechanism comprises seed cleaning scrapers arranged in an arc shape corresponding to the same size suction holes, the seed cleaning scrapers are arranged on the surface of the seed sowing disc, the seed cleaning scrapers are made of rubber, the seed cleaning scrapers are connected with a matching driving assembly, and the seed cleaning scrapers are adapted to different sizes of suction holes to clean extra seeds through the matching driving assembly.

[0011] As a further scheme of the present application: the matching drive assembly comprises a drive shell arranged at the center of the seed metering device rear cover, a drive motor is arranged on the drive shell, the drive motor is connected with a drive gear, a gear disc is rotatably arranged in the drive shell, a plurality of drive screws are rotatably arranged on the side wall of the drive shell, one end of the drive screw arranged in the drive shell is connected with a driven gear, the driven gear and the gear disc are in meshing relationship, a guide sliding groove is arranged at the position corresponding to the drive screw in the seed metering device rear cover, a connecting rod is slidably connected in the guide sliding groove, the connecting rod is connected with a matching sliding block, the matching sliding block and the connecting rod are in threaded connection with the drive screw, and the seed cleaning scraper is slidably connected with the end of the connecting rod.

[0012] As a further scheme of the present application: the seed metering device rear cover is provided with a feeding port at the position corresponding to the seed box, a supporting plate is arranged at the region of the seed metering device rear cover bottom on the side of the feeding port, a vertical partition plate is arranged on the supporting plate, the supporting plate and the partition plate form a seed supporting area, a lifting plate is arranged on the supporting plate, a lifting motor is arranged between the supporting plate and the lifting plate, one end of the lifting plate towards the edge of the seed metering device rear cover is connected with a matching block, the matching block is inserted with the lifting plate through an insertion rod, a supporting spring is sleeved on the insertion rod, and a stretchable film is arranged at the upper end between the lifting plate and the matching block.

[0013] As a further scheme of the present application: the suction hole is arranged in a trumpet shape, and the end of the plugging head is provided with a chamfer.

[0014] Compared with the prior art, the present application has the following advantages:

[0015] (1) A plurality of groups of suction holes with different sizes are arranged on the seed metering disc, the suction holes with different sizes are arranged concentrically, and a corresponding air suction adjusting mechanism is arranged on the air suction disc corresponding to each group of suction holes. When a group of suction holes with a certain size is needed to be used, all the other groups of suction holes are closed by the air suction adjusting mechanism, so that the corresponding suction holes are left to adsorb the seeds of the corresponding size, and the seeds with multiple sizes are adapted for seed metering.

[0016] (2) A plurality of groups of suction holes with different sizes are arranged on the seed metering disc, and a plurality of groups of suction holes are arranged on the air suction disc. When a group of suction holes with a certain size is needed to be used, the other groups of suction holes need to be closed to ensure that only the corresponding group of suction holes adsorbs the seeds. A plurality of plugging rings are arranged on the back of the air suction disc, a plugging head is arranged on the position corresponding to the suction hole on the plugging ring, and the plugging ring keeps the plugging head matched with the suction hole under the action of the connecting slide column and the return spring, so as to close the suction hole and realize the adaptive seed metering of different sizes.

[0017] (3) The suction hole may adsorb multiple seeds. In order to remove the excess seeds from the suction hole, a seed cleaning mechanism is set up. When the seed dispensing tray carries the seeds and rotates, it will interfere with the seeds that are off the suction hole and close to the seed cleaning scraper when they come into contact with each other. This will cause the seeds to fall off the suction hole and fall off. Seeds that are closer to the suction hole will be completely adsorbed by the suction hole under the action of negative pressure. The drive motor and gear disk, drive gear and driven gear drive multiple sets of drive screws to rotate, thereby synchronously controlling multiple sets of matching sliders and connecting rods to move. At this time, the seed cleaning scraper at the end of the connecting rod will adjust the radius of the seed cleaning scraper itself to adapt to the suction holes of different radii under the limiting action of the connecting rod, so as to adapt to the seed cleaning operation of suction holes in different parts.

[0018] (4) Since the height of suction holes of different sizes is different, in order to adapt to the mutual adsorption between seeds and suction holes, the lifting motor drives the lifting plate, the matching block and the telescopic film to move up and down, so that the seeds above the tray can reach the corresponding suction hole and avoid seed retention in the seed support area. Attached Figure Description

[0019] Figure 1 This is a first-view structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of the second perspective structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the disassembled structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the connection structure between the seed cleaning mechanism and the seed metering device rear cover in this invention.

[0023] Figure 5 This is a schematic diagram of the seed cleaning mechanism in this invention.

[0024] Figure 6 This is a schematic diagram of the internal structure of the seed metering device rear cover in this invention.

[0025] Figure 7 This is a schematic diagram of the connection structure between the tray and the mating block in this invention.

[0026] Figure 8 This is a schematic diagram showing the separation structure of the seed metering disc, air suction disc, and air suction adjustment mechanism in this invention.

[0027] Figure 9 for Figure 8 Enlarged structural diagram at point A in the middle.

[0028] Figure 10 for Figure 8 Enlarged structural diagram at point B.

[0029] In the diagram: 1. Air suction chamber outer shell; 10. Negative pressure port; 2. Seed metering device rear cover; 22. Feed inlet; 23. Lifting plate; 24. Lifting motor; 25. Telescopic membrane; 26. Matching block; 27. Insertion rod; 28. Support spring; 3. Seed box; 5. Seed cleaning mechanism; 50. Drive housing; 51. Drive motor; 52. Gear disk; 53. Drive gear; 54. Drive screw; 55. Driven gear; 56. Matching slider; 57. Connecting rod; 58. Seed cleaning scraper; 59. Guide groove; 6. Seed feeding port; 7. Transmission shaft; 8. 80. Seed dispensing tray; 91. Suction hole; 12. Air suction adjustment mechanism; 93. Sealing ring; 94. Sealing head; 95. Push cylinder; 96. Guide frame; 97. Rubber rod; 98. Linkage rod; 99. Inclined block; 90. Matching wedge; 91. Vertical rod; 92. Matching sleeve; 93. Electromagnetic pin; 94. Connecting slide column; 95. Return spring; 16. Air suction cup; 17. Air extraction port; 18. Arc-shaped through groove; 19. Sealing bolt; 10. Seed dropping area; 11. Gasket; 12. Support plate; 13. Partition plate. Detailed Implementation

[0030] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, an electrically controlled pneumatic suction seed metering device suitable for pelleted millet sowing includes a suction chamber shell 1 and a seed metering device rear cover 2. A seed box 3 is provided on the seed metering device rear cover 2. A negative pressure port 10 is provided on the suction chamber shell 1. A suction cup 11 is fixedly installed inside the suction chamber shell 1. A seed metering disc 8 is rotatably installed inside the seed metering device rear cover 2. A drive shaft 7 is connected to the center of the seed metering disc 8. The drive shaft 7 passes through the center of the seed metering device rear cover 2 and is connected to a transmission mechanism. A suction adjustment mechanism 9 is provided between the suction cup 11 and the suction chamber shell 1. Multiple sets of suction cups of various sizes are concentrically distributed in a ring on the seed metering disc 8. The air suction cup 11 is provided with an air extraction port 110 corresponding to the suction hole 80. The seed metering plate 8 is fitted with the air suction cup 11. The outer shell of the air suction chamber 1 is fixedly connected to the rear cover 2 of the seed metering device by bolts. The center of the air suction cup 11 is sealed to the outer shell of the air suction chamber 1 by a sealing bolt 112 and a gasket 12. Sealing rubber rings are provided on both sides of the gasket 12 between the air suction cup 11 and the outer shell of the air suction chamber 1, respectively. The air suction cup 11 is provided with a seed dropping area 113. When the seed metering plate 8 reaches the seed dropping area 113, the seeds are removed from the suction hole 80 and fall into the seed inlet 6 at the bottom of the rear cover 2 of the seed metering device.

[0032] Specifically, in order to adapt to the seed of multiple sizes to be discharged, multiple groups of suction holes 80 of different sizes are arranged on the seed plate 8, and the suction holes 80 of different sizes are arranged concentrically. The air suction adjusting mechanism 9 is arranged on the air suction plate 11 corresponding to each group of suction ports 110. When a certain size of suction port 110 is needed, the air suction adjusting mechanism 9 is combined to close all the suction ports 110 of other sizes, so that the corresponding suction holes 80 of other sizes on the seed plate 8 are closed, and the corresponding suction holes 80 are left to adsorb the seeds of the corresponding size. The seeds are adsorbed and rotated on the seed plate 8, and when they rotate to the seed dropping area 113 of the air suction plate 11, the suction holes 80 and the seed dropping area 113 are mutually attached and the negative pressure disappears, so that the seeds in the suction holes 80 are separated from the suction holes 80 and fall through the seed dropping port 6.

[0033] Further, as shown in Figure 8 、 Figure 9 、 Figure 10 , the air suction adjusting mechanism 9 includes multiple groups of blocking rings 90 arranged concentrically on the air suction plate 11. The blocking rings 90 are arranged corresponding to the suction ports 110 on the air suction plate 11. The blocking rings 90 are provided with blocking heads 91 matched with the suction ports 110. The blocking rings 90 are movably mounted between the air suction plate 11. A driving assembly is arranged between the blocking rings 90 and the air suction plate 11. The driving assembly drives the blocking rings 90 to move away from the air suction plate 11 and makes the blocking heads 91 separate from the suction ports 110. The driving assembly includes push cylinders 92 arranged on the outer circle of the air suction plate 11. The push cylinders 92 are connected with rubber rods 94. The air suction plate 11 is provided with a guide frame 93 corresponding to the position of the rubber rod 94. The guide frame 93 controls the rubber rod 94 to point to the center of the air suction plate 11. The blocking rings 90 are inserted with connecting slide columns 911. The connecting slide columns 911 are fixedly connected with the air suction plate 11. A return spring 912 is arranged between the blocking rings 90 and the connecting slide columns 911. The blocking rings 90 are provided with inclined blocks 96. The air suction plate 11 is slidably mounted with a linkage rod 95 along the radial direction. The linkage rod 95 is provided with a vertical rod 98 corresponding to the position of the inclined block 96. A matching sleeve 99 is slidably and pre-tightly mounted on the vertical rod 98. The matching sleeve 99 is connected with a matching wedge block 97. The matching wedge block 97 is matched with the inclined surface of the inclined block 96. The side of the matching sleeve 99 is provided with an electromagnetic pin 910. The matching sleeve 99 is locked with the vertical rod 98 through the electromagnetic pin 910. The end of the rubber rod 94 is connected with the outermost vertical rod 98.

[0034] Specifically, in order to adapt to different sizes of seeds, a plurality of groups of suction holes 80 of different sizes are arranged on the seed plate 8, and a plurality of groups of air suction ports 110 are arranged on the air suction plate 11 correspondingly. When a suction hole 80 of a certain size is needed, other size suction holes 80 need to be closed to ensure that only the corresponding size suction hole 80 can adsorb the seeds. A plurality of groups of blocking rings 90 are arranged on the back of the air suction plate 11 correspondingly. The part of the blocking ring 90 corresponding to the air suction port 110 is provided with a blocking head 91. The blocking ring 90 is kept in cooperation with the air suction port 110 under the action of the connecting slide column 911 and the return spring 912, so as to close the air suction port 110.

[0035] When the seed needs to be adsorbed, the rubber rod 94 is controlled to be elongated by the push cylinder 92. The matching sleeve 99 at the part of the blocking ring 90 is locked between the electromagnetic pin 910 and the vertical rod 98. At this time, when the rubber rod 94 drives the vertical rod 98 to move, the inclined block 96 is pushed under the action of the matching wedge block 97, so as to push the blocking ring 90 away from the air suction plate 11, thereby driving the blocking head 91 to separate from the air suction port 110 of the corresponding size, and then making the air suction plate 11 suck the air suction hole 80 of the corresponding size on the seed plate 8. At this time, the rotating seed plate 8 will suck the seeds at the part of the air suction hole 80 of the corresponding size, rotate together with the seed plate 8, and finally separate from the air suction hole 80 when reaching the seed dropping area 113.

[0036] Further, as shown in Figure 8 , the air suction plate 11 is provided with an arc-shaped through slot 111 between the air suction ports 110 of the same size. When the air suction plate 11 and the seed plate 8 are matched, the same size suction hole 80 is adsorbed by the negative pressure port 10 and the arc-shaped through slot 111, and rotates together with the seed plate 8.

[0037] Specifically, in order to ensure that the air suction port 110 always forms a negative pressure effect on the rotating air suction hole 80 of the seed plate 8, the arc-shaped through slot 111 is arranged on the side of the air suction port 110 facing the seed plate 8. The air suction hole 80 is always communicated with the arc-shaped through slot 111 during the rotation of the seed plate 8, so as to continuously adsorb the adsorbed seeds.

[0038] Further, as shown in Figure 4 , Figure 5 , the seed cleaner 5 is arranged in the seed plate rear cover 2. The seed cleaner 5 includes a seed cleaning scraper 58 arranged in an arc shape corresponding to the same size air suction hole 80. The seed cleaning scraper 58 is arranged on the surface of the seed plate 8. The seed cleaning scraper 58 is made of rubber. The seed cleaning scraper 58 is connected with a matching driving assembly. The seed cleaning scraper 58 removes the excess seeds through the matching driving assembly suitable for different sizes of air suction holes 80.

[0039] Specifically, the suction hole 80 can adsorb multiple seeds. In order to remove the excess seeds from the suction hole 80, the seed cleaning mechanism 5 is arranged. When the seed plate 8 carrying the seeds rotates and touches the arc-shaped seed cleaning scraper 58, the seed cleaning scraper 58 interferes with the seeds deviating from the suction hole 80 and close to the seed cleaning scraper 58, so that the seeds deviate from the suction hole 80 and fall off. The seeds close to the suction hole 80 are completely adsorbed by the suction hole 80 under the action of negative pressure.

[0040] Further, as shown in Figure 5 , the matching drive assembly includes a drive shell 50 arranged at the center of the seed meter rear cover 2. The drive shell 50 is provided with a drive motor 51. The drive motor 51 is connected with a drive gear 53. The drive shell 50 is rotatably installed with a gear disc 52. A plurality of drive screws 54 are rotatably installed on the side wall of the drive shell 50. One end of the drive screw 54 located in the drive shell 50 is connected with a driven gear 55. The driven gear 55 and the gear disc 52 are in meshing relationship. The part corresponding to the drive screw 54 in the seed meter rear cover 2 is provided with a guide sliding groove 59. The guide sliding groove 59 is slidably connected with a connecting rod 57. The connecting rod 57 is connected with a matching sliding block 56. The matching sliding block 56 and the connecting rod 57 are in threaded connection with the drive screw 54. The seed cleaning scraper 58 is slidably connected with the end of the connecting rod 57.

[0041] Specifically, in order to adapt to the seed cleaning operation of different size suction holes 80, the drive motor 51 and the gear disc 52, the drive gear 53, the driven gear 55 drive a plurality of drive screws 54 to rotate, thereby synchronously controlling a plurality of matching sliding blocks 56 and connecting rods 57 to move. At this time, the seed cleaning scraper 58 at the end of the connecting rod 57 will adjust the radius of the seed cleaning scraper 58 itself under the limiting action of the connecting rod 57, so as to adapt to the seed cleaning operation of the suction holes 80 at different positions.

[0042] Further, as shown in Figure 6 , Figure 7 , the part corresponding to the seed tank 3 of the seed meter rear cover 2 is provided with a feeding port 22. The bottom of the seed meter rear cover 2 is provided with a supporting plate 13 on one side of the feeding port 22. The supporting plate 13 is provided with a vertical partition plate 130. The supporting plate 13 and the partition plate 130 form a seed supporting area. The supporting plate 13 is provided with a lifting plate 23. The supporting plate 13 and the lifting plate 23 are provided with a lifting motor 24. One end of the lifting plate 23 towards the edge of the seed meter rear cover 2 is connected with a matching block 26. The matching block 26 is inserted with the lifting plate 23 through the insertion rod 27. The insertion rod 27 is sleeved with a supporting spring 28. The upper end between the lifting plate 23 and the matching block 26 is provided with a stretchable film 25.

[0043] Specifically, since the heights of the different sizes of the suction holes 80 are different, in order to adapt to the mutual adsorption between the seeds and the suction holes 80, the lifting motor 24 drives the lifting plate 23, the matching block 26 and the telescopic film 25 to move up and down, so that the seeds above the supporting plate 13 can reach the positions of the corresponding suction holes 80, and the seed retention in the seed supporting area is avoided.

[0044] Further, as shown in Figure 8 、 Figure 9 , the suction hole 80 is arranged in a trumpet shape, and the end of the plugging head 91 is provided with a chamfer.

[0045] Specifically, the trumpet-shaped suction hole 80 is more suitable for the adsorption of the seeds, and the chamfer of the plugging head 91 facilitates the mutual docking of the plugging head 91 and the air suction port 110 to complete the plugging operation.

[0046] The working principle of the embodiment of the application is as follows:

[0047] As shown in Figures 1-10As shown, in order to adapt to the seed of various sizes, a plurality of groups of suction holes 80 of different sizes are arranged on the seed plate 8, and the suction holes 80 of different sizes are arranged concentrically. The air suction adjusting mechanism 9 is arranged on the air suction plate 11 corresponding to each group of air suction ports 110. When a certain size of air suction port 110 is needed, the air suction adjusting mechanism 9 is combined to close all other sizes of air suction ports 110, so that the corresponding other size suction holes 80 on the seed plate 8 are closed, and the corresponding suction holes 80 are left to adsorb the corresponding size seeds. The seeds are adsorbed by the seed plate 8 and then rotate. When the seeds rotate to the seed dropping area 113 of the air suction plate 11, the suction holes 80 and the seed dropping area 113 are mutually attached and the negative pressure disappears, so that the seeds in the suction holes 80 are separated from the suction holes 80 and fall through the seed dropping port 6. In order to realize the seed of different sizes, a plurality of groups of suction holes 80 are arranged on the seed plate 8, and a plurality of groups of air suction ports 110 are arranged on the air suction plate 11. When a certain size of suction hole 80 is needed, other size suction holes 80 need to be closed to ensure that only the corresponding size suction hole 80 adsorbs the seeds. A plurality of blocking rings 90 are arranged on the back of the air suction plate 11. The blocking head 91 is arranged on the part of the blocking ring 90 corresponding to the air suction port 110. The blocking ring 90 is kept in cooperation with the air suction port 110 under the action of the connecting slide column 911 and the return spring 912, so as to close the air suction port 110. When the seed is adsorbed, the rubber rod 94 is elongated under the control of the push cylinder 92. The matching sleeve 99 corresponding to the part of the blocking ring 90 is locked between the electromagnetic pin 910 and the vertical rod 98. At this time, when the vertical rod 98 is moved by the rubber rod 94, the inclined block 96 is pushed under the action of the matching wedge block 97, so as to push the blocking ring 90 away from the air suction plate 11, so as to drive the blocking head 91 to separate from the corresponding size air suction port 110, so as to make the air suction plate 11 suck the corresponding size suction hole 80 on the seed plate 8. At this time, the rotating seed plate 8 will suck the seeds at the corresponding size suction hole 80 part, rotate with the seed plate 8, and finally separate from the suction hole 80 when reaching the seed dropping area 113. In order to ensure that the air suction port 110 always forms a negative pressure effect on the suction hole 80 on the rotating seed plate 8, the arc-shaped through groove 111 is arranged on the side of the air suction port 110 facing the seed plate 8. The suction hole 80 is always communicated with the arc-shaped through groove 111 during rotation with the seed plate 8, so as to continuously adsorb the adsorbed seeds. The suction hole 80 may adsorb multiple seeds. In order to remove the excess seeds from the suction hole 80, the seed cleaning mechanism 5 is arranged. When the seed plate 8 carrying the seeds rotates and touches the arc-shaped seed cleaning scraper 58, the seeds deviating from the suction hole 80 and close to the seed cleaning scraper 58 part are interfered, so that the seeds separate from the suction hole 80 and fall off, and the seeds close to the suction hole 80 part are completely adsorbed by the suction hole 80 under the action of negative pressure.In order to adapt to the seed cleaning work of different size suction holes 80, the driving motor 51 and the gear plate 52, the driving gear 53, the driven gear 55 drive a plurality of groups of driving screws 54 to rotate, thereby synchronously controlling a plurality of groups of matching sliding blocks 56 and connecting rods 57 to move, at this time the seed cleaning scraper 58 at the end of the connecting rod 57 will be adjusted under the limiting action of the connecting rod 57 to adapt to the radius of the suction hole 80, and the radius of the seed cleaning scraper 58 itself is adjusted, thereby adapting to the seed cleaning work of the suction hole 80 at different positions. Due to the difference in height of different size suction holes 80, in order to adapt to the mutual adsorption between the seeds and the suction holes 80, the lifting motor 24 drives the lifting plate 23, the matching block 26 and the telescopic film 25 to move up and down, thereby enabling the seeds above the supporting plate 13 to reach the position corresponding to the suction hole 80, avoiding the seed retention in the seed supporting area.

[0048] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. Any reference signs in the claims shall not be regarded as limiting the claims.

[0049] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An electrically controlled pneumatic seed metering device suitable for pelleted millet sowing, comprising a pneumatic suction chamber shell (1) and a seed metering device rear cover (2), wherein a seed box (3) is provided on the seed metering device rear cover (2), and a negative pressure port (10) is provided on the pneumatic suction chamber shell (1), characterized in that, An air suction cup (11) is fixedly installed inside the outer shell (1) of the air suction chamber. A seed metering disc (8) is rotatably installed inside the rear cover (2) of the seed metering device. A drive shaft (7) is connected to the center of the seed metering disc (8). The drive shaft (7) passes through the center of the rear cover (2) of the seed metering device and is connected to a transmission mechanism. An air suction adjustment mechanism (9) is provided between the air suction cup (11) and the outer shell (1) of the air suction chamber. Multiple sets of suction holes (80) of various sizes are concentrically distributed on the seed metering disc (8). An air suction port (110) is provided on the air suction cup (11) corresponding to the suction holes (80). The seed metering disc (8) and the air suction cup (11) are connected to each other. 11) The air suction chamber shell (1) and the seed metering device rear cover (2) are fixedly connected by bolts. The center of the air suction cup (11) is sealed to the air suction chamber shell (1) by sealing bolts (112) and gaskets (12). The two sides of the gaskets (12) are respectively provided with sealing rings between the air suction cup (11) and the air suction chamber shell (1). The air suction cup (11) is provided with a seed dropping area (113). When the seed metering plate (8) reaches the seed dropping area (113), the seeds are removed from the suction hole (80) and fall to the seed inlet (6) at the bottom of the seed metering device rear cover (2).

2. The electrically controlled pneumatic seed metering device for pelleted millet sowing according to claim 1, characterized in that, The air suction adjustment mechanism (9) includes multiple sets of sealing rings (90) concentrically arranged on the air suction cup (11). The sealing rings (90) are arranged corresponding to the air suction port (110) on the air suction cup (11). The sealing rings (90) are provided with sealing heads (91) that cooperate with the air suction port (110). The sealing rings (90) and the air suction cup (11) are movably installed. A driving component is provided between the sealing rings (90) and the air suction cup (11). The driving component drives the sealing rings (90) away from the air suction cup (11) and causes the sealing heads (91) to disengage from the air suction port (110).

3. The electrically controlled pneumatic seed metering device suitable for pelleted millet sowing according to claim 2, characterized in that, The driving assembly includes push cylinders (92) distributed around the outer ring of the air suction cup (11). The push cylinders (92) are connected to rubber rods (94). A guide frame (93) is provided on the air suction cup (11) at a position corresponding to the rubber rods (94). The guide frame (93) controls the rubber rods (94) to point towards the center of the air suction cup (11). A connecting slide pin (911) is inserted into the sealing ring (90). The connecting slide pin (911) is fixedly connected to the air suction cup (11). A return spring (912) is provided between the sealing ring (90) and the connecting slide pin (911). An inclined block (96) is provided on the sealing ring (90). The air suction cup (11) is slidably mounted with a linkage rod (95) along the radial direction. A vertical rod (98) is provided on the linkage rod (95) at the position corresponding to the inclined block (96). A mating sleeve (99) is slidably pre-tightly mounted on the vertical rod (98). A mating wedge (97) is connected to the mating sleeve (99). The mating wedge (97) and the inclined surface of the inclined block (96) are mutually mated. An electromagnetic pin (910) is provided on the side of the mating sleeve (99). The mating sleeve (99) is locked to the vertical rod (98) through the electromagnetic pin (910). The end of the rubber rod (94) is connected to the vertical rod (98) located on the outermost ring.

4. The electrically controlled pneumatic seed metering device suitable for pelleted millet sowing according to claim 1, characterized in that, An arc-shaped through groove (111) is provided between the air suction cup (11) and the air suction cup (11) with the same size suction port (110). When the air suction cup (11) and the seed metering plate (8) are in contact with each other, the negative pressure port (10) and the arc-shaped through groove (111) control the suction hole (80) of the same size to adsorb the seeds and rotate together with the seed metering plate (8).

5. The electrically controlled pneumatic seed metering device suitable for pelleted millet sowing according to claim 1, characterized in that, The seed metering device has a seed cleaning mechanism (5) inside the rear cover (2). The seed cleaning mechanism (5) includes a seed cleaning scraper (58) with an arc shape corresponding to the suction holes (80) of the same size. The seed cleaning scraper (58) is attached to the surface of the seed metering tray (8). The seed cleaning scraper (58) is made of rubber. The seed cleaning scraper (58) is connected to a matching drive component. The seed cleaning scraper (58) removes excess seeds by cooperating with the drive component to adapt to suction holes (80) of different sizes.

6. The electrically controlled pneumatic seed metering device for pelleted millet sowing according to claim 5, characterized in that, The supporting drive assembly includes a drive housing (50) located at the center of the seed meter rear cover (2). A drive motor (51) is mounted on the drive housing (50). The drive motor (51) is connected to a drive gear (53). A gear disk (52) is rotatably mounted inside the drive housing (50). Multiple sets of drive screws (54) are rotatably mounted on the side wall of the drive housing (50). One end of each drive screw (54) located inside the drive housing (50) is connected to a driven gear (55). The moving gear (55) meshes with the gear disk (52). A guide groove (59) is provided in the back cover (2) of the seed metering device corresponding to the drive screw (54). A connecting rod (57) is slidably engaged in the guide groove (59). A matching slider (56) is connected to the connecting rod (57). The matching slider (56) and the connecting rod (57) are threadedly connected to the drive screw (54). The seed cleaning scraper (58) is slidably engaged with the end of the connecting rod (57).

7. The electrically controlled pneumatic seed metering device for pelleted millet sowing according to claim 1, characterized in that, The seed metering device rear cover (2) is provided with a feed inlet (22) corresponding to the seed box (3). The bottom of the seed metering device rear cover (2) is provided with a support plate (13) on the side of the feed inlet (22). A vertical partition (130) is provided on the support plate (13). The support plate (13) and the partition (130) form a seed support area. A lifting plate (23) is provided on the support plate (13). A lifting motor (24) is provided between the support plate (13) and the lifting plate (23). A mating block (26) is connected to one end of the lifting plate (23) facing the edge of the seed metering device rear cover (2). The mating block (26) is inserted into the lifting plate (23) through a plug rod (27). A support spring (28) is sleeved on the plug rod (27). A telescopic film (25) is provided at the upper end between the lifting plate (23) and the mating block (26).

8. The electrically controlled pneumatic seed metering device for pelleted millet sowing according to claim 2, characterized in that, The suction hole (80) is funnel-shaped, and the end of the sealing head (91) is chamfered.

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