Seed lowering device of roller seeder

Abstract

The invention relates to the technical field of seed lowering devices, in particular to a seed lowering device of a roller seeder, which comprises a roller, a plurality of groups of air distribution cavities are arranged in the circumferential direction of the roller, insertion plates are arranged in the air distribution cavities, and a first ejector rod and a second ejector rod are fixedly arranged on one side, away from a first spring, of each insertion plate. During seed lowering operation, the roller carries the seeds at the through hole II to rotate to the opening below the clamping sleeve, at the moment, the air distribution mechanism cancels the suction of the group of air distribution cavities, so that the seeds naturally fall into a seeding tray below from the opening of the through hole II, and when part of the seeds are clamped at the opening of the through hole II and cannot fall smoothly, the seeds can be sown in the seeding tray. When the seeds fall off, a first ejector rod in an air distribution cavity at an opening below a clamping sleeve is separated from the inner wall of the clamping sleeve, so that a first spring pushes an insertion plate, the insertion plate drives a second ejector rod to slide and extend out along a second through hole, the second ejector rod pushes the seeds clamped in the second through hole, the seeds are pushed out of the second through hole, and it is guaranteed that the seeds fall off smoothly.

Description

Technical Field

[0001] This application relates to the technical field of seed dispensing devices, specifically a seed dispensing device for a drum seeder. Background Technology

[0002] In the field of mechanized agricultural seeding, precision seeding lines are key equipment for achieving high-efficiency production. Existing technologies often employ a negative pressure adsorption seed dispensing device, whose typical structure includes a conveyor belt with a feed tray and a rotating roller mounted above it. The roller surface has several suction holes connected to a suction pump. During operation, when the roller rotates to the seed box position, the negative pressure generated by the suction holes adsorbs the seeds onto the roller surface. When the area of ​​the roller carrying the seeds rotates to the corresponding position in the groove of the feed tray below, the negative pressure is cut off, allowing the seeds to fall naturally into the groove under gravity, thus achieving precise seeding.

[0003] However, in this method, due to the negative pressure adsorption process, the suction force can easily cause some seeds, especially those similar in size to the suction hole or irregularly shaped, to become stuck inside. When the negative pressure is cut off, the friction between the seed and the hole wall, the residual vacuum, and the seed's own adsorption state prevent these stuck seeds from falling off smoothly by gravity, leaving them trapped inside. This not only directly causes missed sowing in the current sowing cycle, affecting the sowing effect, but the trapped seeds may also affect the normal adsorption and dispensing of subsequent stations on the roller, reducing the reliability of equipment operation and sowing accuracy. Summary of the Invention

[0004] To address the problem that some seeds cannot be detached in existing technologies, this invention provides a seed lowering device for a drum seeder.

[0005] Therefore, the specific technical solution adopted by the present invention is as follows: This invention provides a seed discharging device for a roller seeder, comprising a frame, a conveyor belt mounted on the frame, and a seed tray placed on the conveyor belt, characterized in that: A fixed frame is fixedly installed on the top of the frame, and a storage tray is fixedly installed on one side of the fixed frame. A roller is rotatably installed on the fixed frame. The roller has multiple sets of air distribution chambers along its circumference. An insert plate is installed in the air distribution chamber. A spring is installed on the side of the insert plate near the roller axis. The two ends of the spring are connected to the insert plate and the roller, respectively. A push rod 1 and a push rod 2 are fixedly installed on the side of the insert plate away from the spring 1. There are two sets of push rod 1 located at both ends of the insert plate. There are multiple sets of push rod 2 spaced between the two sets of push rod 1. The length of push rod 1 is greater than the length of push rod 2. The outer wall of the roller has multiple sets of through holes 1 and through holes 2 that connect to the air distribution chambers. Push rod 1 is inserted into through hole 1, and push rod 2 is inserted into through hole 2. A set of clamping sleeves is fixedly installed at both ends of the fixed frame. The clamping sleeves are fitted onto the roller. The lower part of the clamping sleeves has an opening. The end of push rod 1 away from the insert plate abuts against the inner wall of the clamping sleeve. It also includes a gas distribution mechanism, which is mounted on the frame; It also includes a feeding mechanism, which is mounted on a fixed frame.

[0006] Preferably, the gas distribution mechanism includes a negative pressure component, a gas distribution pipe, and a gas distribution plate. The negative pressure component is fixedly mounted on the frame, and the gas distribution plate is fixedly mounted on one side of the fixed frame. The gas distribution plate has an arc-shaped groove that communicates with the gas distribution chamber, and a vent hole is provided at the bottom of the gas distribution plate. The two ends of the gas distribution pipe are respectively connected to the negative pressure component and the arc-shaped groove.

[0007] Preferably, the feeding mechanism includes a fixed plate, a guide tube, and a feeding unit. The fixed plate is located below the roller and is fixedly connected to the fixed frame. Multiple sets of guide tubes aligned with the through holes are fixedly arranged at intervals on the fixed plate. The bottom of the guide tube is aligned with the seeding tray. The feeding unit is located at the bottom of the guide tube.

[0008] Preferably, the material guiding unit includes an installation plate, connecting rods, a bottom tube, a top plate, a second spring, a fixing ring, and protrusions. The installation plate is located below the fixing plate. The bottom tube is slidably disposed at the bottom of the guide tube and is fixedly connected to the installation plate. Connecting rods are fixedly disposed at both ends of the installation plate and inserted into the fixing plate. The top plate is located above the fixing plate and is fixedly connected to the top of the connecting rods. A second spring is sleeved on a section of the connecting rod between the top plate and the fixing plate. The two ends of the second spring are respectively connected to the top plate and the fixing plate. The fixing ring is fixedly disposed on the roller. The fixing ring has multiple sets of protrusions along the circumference that are opposite to the air distribution chamber. The top of the top plate abuts against the protrusions.

[0009] Preferably, the top of the conduit is provided with a scraper plate, which is L-shaped and has a groove at its horizontal end that is opposite to the top rod.

[0010] Preferably, a conical disc is fixedly provided at the top of the conduit, and the bottom of the scraper is fixedly connected to the top of the conical disc.

[0011] Preferably, the inner wall of the card slot is provided with a sponge brush.

[0012] Preferably, the ends of the first and second push rods away from the insert plate are both arc-shaped, and the two sides of the opening below the sleeve are provided with bevels.

[0013] Preferably, the springs are in multiple sets and are arranged at intervals along the length of the insert plate.

[0014] The advantages of adopting the above technical solution are: 1. During the seed release operation, the roller carries the seeds from the second through hole to the opening below the sleeve. At this time, the air distribution mechanism cancels the suction of the air distribution chamber, allowing the seeds to fall naturally from the opening of the second through hole into the seeding tray below. When some seeds are stuck in the opening of the second through hole and cannot fall smoothly, the first push rod in the air distribution chamber at the opening below the sleeve disengages from the inner wall of the sleeve, thus the spring pushes the insert plate. At this time, the insert plate drives the second push rod to slide out along the second through hole, so that the second push rod pushes the seeds stuck in the second through hole, thereby pushing the seeds out of the second through hole and ensuring that the seeds fall smoothly. 2. The fixed plate below the roller is equipped with a guide tube aligned with the second through hole. Seeds falling through the second through hole fall into the guide tube. The guide tube guides and limits the falling of the seeds inside, ensuring that the seeds fall accurately into the groove in the seeding tray and avoiding large deviations of the seeds during the falling process. 3. The conical disc at the top of the guide tube ensures that the seeds fall accurately into the guide tube when they fall. When the roller drives the protrusion on the sleeve to rotate, the protrusion abuts and squeezes against the top plate, which in turn drives the bottom tube of the guide tube to insert downward into the groove, so that the seeds in the guide tube can fall accurately into the bottom of the groove, thus improving the seed placement accuracy. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of the present invention is shown; Figure 2 A schematic diagram of the structure at the roller of the present invention is shown; Figure 3 A partial cross-sectional view of the roller of the present invention is shown; Figure 4 A schematic diagram of the structure at the fixing plate of the present invention is shown; Figure 5 A partial enlarged view of point A in the present invention is shown; Figure 6 A partial enlarged view of point B in the present invention is shown; Figure 7 A schematic diagram of the structure of the roller and the sleeve of the present invention is shown; Figure 8 A schematic diagram of the fixing ring of the present invention is shown; Figure 9 A schematic diagram of the structure of the top rod and scraper plate of the present invention is shown.

[0017] The components are as follows: 1. Frame; 10. Seeding tray; 2. Conveyor belt; 3. Fixing frame; 31. Storage tray; 32. Fixing plate; 33. Mounting plate; 34. Connecting rod; 35. Top plate; 36. Spring 2; 4. Roller; 41. Air distribution chamber; 42. Fixing ring; 43. Protrusion; 44. Countersunk hole; 5. Insert plate; 51. Top rod 1; 52. Top rod 2; 53. Spring 1; 54. Limiting rod; 6. Sleeve; 61. Inclined surface; 7. Air distribution plate; 71. Arc groove; 72. Ventilation hole; 73. Air distribution pipe; 8. Guide tube; 81. Conical plate; 82. Bottom pipe; 9. Scraper; 91. Slot. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] like Figure 1-9 As shown in the figure, an embodiment of the present invention discloses a seed dispensing device for a drum seeder, including a frame 1, an air distribution mechanism, and a feeding mechanism. A conveyor belt 2 is provided on the frame 1, and a seeding tray 10 is placed on the conveyor belt 2. A fixed frame 3 is fixedly provided on the top of the frame 1, and a storage tray 31 is fixedly provided on one side of the fixed frame 3. A drum 4 is rotatably provided on the fixed frame 3. The drum 4 has multiple sets of air distribution chambers 41 along its circumference. An insert plate 5 is provided in the air distribution chamber 41. A spring 53 is provided on the side of the insert plate 5 near the axis of the drum 4. The two ends of the spring 53 are respectively connected to the insert plate 5 and the drum 4. A top rod 51 and a top rod are fixedly provided on the side of the insert plate 5 away from the spring 53. There are two sets of rod 52 and top rod 51 located at both ends of the insert plate 5. There are multiple sets of top rod 52 spaced between the two sets of top rod 51. The length of top rod 51 is greater than the length of top rod 52. The outer wall of the roller 4 is provided with multiple sets of through holes 1 and through holes 2 that connect to the air distribution chamber 41. Top rod 51 is inserted into through hole 1 and top rod 52 is inserted into through hole 2. A set of clamping sleeves 6 are fixedly installed at both ends of the fixed frame 3. The clamping sleeves 6 are fitted onto the roller 4. The lower part of the clamping sleeves 6 has an opening. The end of top rod 51 away from the insert plate 5 abuts against the inner wall of the clamping sleeve 6. The air distribution mechanism is set on the frame 1 and the feeding mechanism is set on the fixed frame 3.

[0020] In at least one embodiment, the air distribution mechanism includes a negative pressure component, an air distribution pipe 73, and an air distribution plate 7. The negative pressure component is fixedly mounted on the frame 1, and the air distribution plate 7 is fixedly mounted on one side of the fixed frame 3. The air distribution plate 7 has an arc-shaped groove 71 communicating with the air distribution chamber 41, and a vent hole 72 is provided at the bottom of the air distribution plate 7. The two ends of the air distribution pipe 73 are respectively connected to the negative pressure component and the arc-shaped groove 71. The negative pressure component is activated during seed placement. The negative pressure component can be a structure such as an air pump. The push rod 51 in part of the air distribution chamber 41 abuts against the inner wall of the sleeve 6. At this time, this part of the air distribution chamber 41 is connected to the outside of the roller 4 through the through hole 2, and this part of the air distribution chamber 41 is connected to the air distribution plate 7. The arc-shaped groove 71 is connected, and the negative pressure component draws air from the air distribution chamber 41 connected to the arc-shaped groove 71 through the air distribution pipe 73, thereby creating negative pressure in the air distribution chamber 41. The through hole 2 in this part of the air distribution chamber 41 can adsorb the seeds in the storage tray 31. When the roller 4 drives the air distribution chamber 41 to rotate to the opening below the sleeve 6, the push rod 51 disengages from the inner wall of the sleeve 6. At this time, the air distribution chamber 41 disengages from the arc-shaped groove 71 and connects to one end of the vent hole 72 at the bottom of the air distribution tray 7. The other end of the vent hole 72 connects to the outside, so that the negative pressure state in the air distribution chamber 41 is canceled, ensuring that the seeds fall smoothly from the opening of the through hole 2.

[0021] In at least one embodiment, the feeding mechanism includes a fixed plate 32, a guide tube 8, and a guiding unit. The fixed plate 32 is located below the roller 4 and is fixedly connected to the fixed frame 3. Multiple sets of guide tubes 8 aligned with the through holes are fixedly arranged at intervals on the fixed plate 32. The bottom of the guide tube 8 is aligned with the seeding tray 10. The guiding unit is located at the bottom of the guide tube 8. When the roller 4 rotates the seeds at the through holes to the bottom, the seeds fall and fall into the guide tubes 8 aligned with the through holes. The guide tube 8 guides and limits the falling seeds to prevent them from deviating significantly and ensures that the seeds fall accurately into the seeding tray 10 from the bottom of the guide tube 8. The guiding unit at the bottom of the guide tube 8 can guide the seeds to the bottom of the groove on the seeding tray 10 when the seeds fall, thereby improving the accuracy of seed placement.

[0022] In at least one embodiment, the material guiding unit includes a mounting plate 33, a connecting rod 34, a bottom tube 82, a top plate 35, a second spring 36, a fixing ring 42, and a protrusion 43. The mounting plate 33 is located below the fixing plate 32. The bottom tube 82 is slidably disposed at the bottom of the guide tube 8 and is fixedly connected to the mounting plate 33. The two ends of the mounting plate 33 are fixedly disposed with connecting rods 34, which are inserted into the fixing plate 32. The top plate 35 is located above the fixing plate 32 and is fixedly connected to the top of the connecting rods 34. A second spring 36 is sleeved on a section of the connecting rod 34 between the top plate 35 and the fixing plate 32. The two ends of the second spring 36 are respectively connected to the top plate 35 and the fixing plate 32. The fixing ring 42 is fixedly disposed on the roller 4 and has multiple sets of air distribution chambers 41 arranged circumferentially. The top of the top plate 35 abuts against the corresponding protrusion 43. When the roller 4 rotates carrying seeds, the fixing ring 42 and the protrusion 43 rotate synchronously with the roller 4. When the roller 4 rotates carrying seeds, the protrusion 43, which is aligned with the air distribution chamber 41 above the guide tube 8, abuts against the top plate 35 above the fixing plate 32. When the protrusion 43 rotates, it pushes the top plate 35 and the connecting rod 34 to descend. When the top plate 35 descends, it compresses the second spring 36. The mounting plate 33 at the bottom of the connecting rod 34 drives the bottom tube 82 to descend along the guide tube 8, so that the bottom end of the bottom tube 82 is inserted into the bottom of the groove of the seeding tray 10. The seeds falling through the second through hole are guided and limited by the guide tube 8 and the bottom tube 82 and finally fall into the bottom of the groove, improving the seed dropping accuracy.

[0023] In at least one embodiment, a scraper 9 is provided at the top of the guide tube 8. The scraper 9 is L-shaped, and the horizontal end of the scraper 9 is provided with a groove 91 opposite to the second push rod 52. After the roller 4 continuously drives the seeds to rotate to the bottom and the second push rod 52 pushes the seeds in the second through hole to fall off, the top surface of the horizontal end of the scraper 9 at the top of the guide tube 8 abuts against the outer wall of the roller 4, thereby scraping the outer wall of the roller 4 to prevent some seeds from adhering to the outer wall of the roller 4. When the end of the second push rod 52 rotates, it passes through the groove 91 on the scraper 9. The side wall of the groove 91 can scrape the end of the second push rod 52 that extends out of the second through hole to prevent the seeds from adhering to the second push rod 52, ensuring that the seeds adhering to the roller 4 and the second push rod 52 fall off completely.

[0024] In at least one embodiment, a conical disk 81 is fixedly provided at the top of the conduit 8, and the bottom of the scraper 9 is fixedly connected to the top of the conical disk 81. The top diameter of the conical disk 81 is larger than the bottom diameter. After the seeds fall through the second through hole into the conical disk 81, they can slide along the inner wall of the conical disk 81 into the conduit 8, thus avoiding the seeds from deviating when they leave the second through hole and failing to fall into the conduit 8, and ensuring the accuracy of seed placement.

[0025] In at least one embodiment, the inner wall of the slot 91 is provided with a sponge brush. When the push rod 52 passes through the slot 91, the sponge brush cleans the protruding end of the push rod 52, thereby preventing the side wall of the slot 91 from directly scraping the push rod 52 and improving the service life of the push rod 52.

[0026] In at least one embodiment, the ends of push rod 51 and push rod 52 away from the insert plate 5 are both arc-shaped. The two sides of the opening below the sleeve 6 are provided with inclined surfaces 61. The arc-shaped ends of push rod 51 and push rod 52 cause the roller 4 to drive push rod 51, which extends out of the through hole, to continue rotating, so that push rod 51 abuts against the inner wall of sleeve 6 again. The inclined surface 61 at the opening below the sleeve 6 abuts and squeezes the arc-shaped end face of the outer end of push rod 51, reducing the friction surface between push rod 51 and the inner wall of the slot 91, and reducing the wear of the contact surface between push rod 51 and sleeve 6.

[0027] In at least one embodiment, the springs 53 are in multiple sets and are arranged at intervals along the length of the insert plate 5. The multiple sets of springs 53 together connect and support the insert plate 5, ensuring the stability of the continuous reciprocating movement of the insert plate 5.

[0028] In at least one embodiment, a motor is fixedly installed on one side of the fixing frame 3. The output shaft of the motor is connected to one end of the roller 4 for transmission. When the seed is being placed, the operator starts the motor, and the output shaft of the motor drives the roller 4 to rotate, thereby moving the seeds. The operation is convenient.

[0029] In at least one embodiment, the air distribution chamber 41 is provided with a countersunk hole 44 that connects to the second through hole. The diameter of the countersunk hole 44 is larger than that of the second through hole. An inclined surface is provided at the connection between the countersunk hole 44 and the second through hole. When the outer end of the second push rod 52 slides back into the countersunk hole 44, the second through hole and the air distribution chamber 41 can be connected to the outside of the roller 4. The inclined surface provided at the connection can guide the second push rod 52 during its reciprocating sliding, ensuring that the second push rod 52 is accurately aligned with the second through hole.

[0030] In at least one embodiment, a limiting rod 54 is fixedly provided on one end of the insert plate 5 and the spring 53. The inner wall of the air distribution cavity 41 is provided with a limiting groove that matches the limiting rod 54. The spring 53 is sleeved on the limiting rod 54. When the push rod 51 drives the insert plate 5 to slide, one end of the limiting rod 54 slides along the limiting groove to limit the push rod 51 and the insert plate 5, thereby ensuring the stability of the sliding of the insert plate 5.

[0031] During seed dispensing, seeds are stored in a storage basin on the fixed frame 3. Multiple seed sowing trays 10 are placed on the conveyor belt 2 on the machine frame 1. Each seed sowing tray 10 has multiple grooves for placing seeds. The conveyor belt 2 transports the seed sowing trays 10 from one end of the machine frame 1 through the bottom of the roller 4 to the other end. A motor is fixedly installed on the fixed frame 3. During operation, the operator starts the motor and the negative pressure component. At this time, the motor drives the roller 4 to rotate. The roller 4 has multiple air distribution chambers 41, and each air distribution chamber 41 has an insert plate 5. During the rotation of the roller 4, the push rod 51 in the through hole 1 that fits against the sleeve 6 is squeezed by the inner wall of the sleeve 6. At this time, the push rod 51 drives the insert plate 5 to compress the spring 53. Since the length of the push rod 52 is less than that of the spring 53, the spring 53 is compressed. The length of rod 51 is such that top rod 52 is located inside the air distribution chamber 41. The air distribution chamber 41 is connected to the outside of the roller 4 through through hole 2. The air distribution mechanism will suck up the air distribution chamber 41 and through hole 2 in this state. The bottom of the storage tray 31 is in contact with the outer wall of the roller 4, and the height of the bottom of the storage tray 31 is higher than the height of the opening below the sleeve 6. When the roller 4 drives through hole 2 to rotate into the storage tray 31, through the suction of the air distribution mechanism, the seeds in the storage tray 31 are adsorbed at the opening of through hole 2. Then the roller 4 carries the adsorbed seeds and rotates. When the seeding tray 10 moves below the roller 4, the roller 4 carries one set of air distribution chambers 41 to the opening below the sleeve 6. At this time, the inner wall of the sleeve 6 is separated from the opening of through hole 1. The seeds are properly aligned, and the air distribution mechanism cancels the suction at the air distribution chamber 41 at this position. At this time, the seeds at the opening of the second through hole naturally fall into the groove in the seeding tray 10 below, thus completing the seed placement. After the seeds fall, the feeding mechanism on the fixing frame 3 guides the falling seeds to ensure that the seeds fall accurately into the groove in the seeding tray 10, improving the seed placement accuracy. When some seeds are stuck at the opening of the second through hole and cannot fall, the spring 53 in the air distribution chamber 41 pushes the insert plate 5, causing the insert plate 5 to drive the push rod 51 and the push rod 52 to slide along the first and second through holes respectively. When the spring 53 pushes the insert plate 5 so that the side of the insert plate 5 closest to the first through hole abuts against the inner wall of the air distribution chamber 41, the push rod 51... When 51 and 52 stop sliding, the end of 51 away from the insert plate 5 extends out of the opening of the first through hole, and the end of 52 away from the insert plate 5 extends slightly out of the opening of the second through hole. As 52 slides along the second through hole, it pushes the seeds at the opening of the second through hole, thus pushing the seeds that cannot fall naturally to fall into the seeding tray 10 below, ensuring the smooth release of the seeds. After the seeds fall, the roller 4 drives the 51 extending out of the first through hole to continue rotating. When the extended end of the 51 rotates to the other side of the bottom opening of the sleeve 6, the side wall of the opening abuts and squeezes the outer end of the 51, causing the 51 to slide and retract along the first through hole, thus ensuring the effective and continuous release of the seeds.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A seed discharging device for a roller seeder, comprising a frame, a conveyor belt mounted on the frame, and a seed tray placed on the conveyor belt, characterized in that: A fixed frame is fixedly installed on the top of the frame, and a storage tray is fixedly installed on one side of the fixed frame. A roller is rotatably installed on the fixed frame. The roller has multiple sets of air distribution chambers along its circumference. An insert plate is installed in the air distribution chamber. A spring is installed on the side of the insert plate near the roller axis. The two ends of the spring are connected to the insert plate and the roller, respectively. A push rod 1 and a push rod 2 are fixedly installed on the side of the insert plate away from the spring 1. There are two sets of push rod 1 located at both ends of the insert plate. There are multiple sets of push rod 2 spaced between the two sets of push rod 1. The length of push rod 1 is greater than the length of push rod 2. The outer wall of the roller has multiple sets of through holes 1 and through holes 2 that connect to the air distribution chambers. Push rod 1 is inserted into through hole 1, and push rod 2 is inserted into through hole 2. A set of clamping sleeves is fixedly installed at both ends of the fixed frame. The clamping sleeves are fitted onto the roller. The lower part of the clamping sleeves has an opening. The end of push rod 1 away from the insert plate abuts against the inner wall of the clamping sleeve. It also includes a gas distribution mechanism, which is mounted on the frame; It also includes a feeding mechanism, which is mounted on a fixed frame.

2. The seed discharging device for a drum seeder according to claim 1, characterized in that: The gas distribution mechanism includes a negative pressure component, a gas distribution pipe, and a gas distribution plate. The negative pressure component is fixedly mounted on the frame, and the gas distribution plate is fixedly mounted on one side of the fixed frame. The gas distribution plate has an arc-shaped groove that communicates with the gas distribution chamber, and a vent hole is provided at the bottom of the gas distribution plate. The two ends of the gas distribution pipe are respectively connected to the negative pressure component and the arc-shaped groove.

3. The seed discharging device for a drum seeder according to claim 1, characterized in that: The feeding mechanism includes a fixed plate, a guide tube, and a feeding unit. The fixed plate is located below the roller and is fixedly connected to the fixed frame. Multiple sets of guide tubes aligned with the through holes are fixedly arranged at intervals on the fixed plate. The bottom of the guide tube is aligned with the seeding tray. The feeding unit is located at the bottom of the guide tube.

4. The seed discharging device for a drum seeder according to claim 3, characterized in that: The material guiding unit includes an installation plate, connecting rods, a bottom tube, a top plate, a second spring, a fixing ring, and protrusions. The installation plate is located below the fixing plate. The bottom tube is slidably sleeved on the bottom of the guide tube and is fixedly connected to the installation plate. Connecting rods are fixedly installed at both ends of the installation plate and inserted into the fixing plate. The top plate is located above the fixing plate and is fixedly connected to the top of the connecting rods. A second spring is sleeved on a section of the connecting rod between the top plate and the fixing plate. The two ends of the second spring are connected to the top plate and the fixing plate, respectively. The fixing ring is fixedly installed on the roller. The fixing ring has multiple sets of protrusions along the circumference that are opposite to the air distribution chamber. The top of the top plate abuts against the protrusions.

5. The seed discharging device for a drum seeder according to claim 3, characterized in that: The top of the guide tube is provided with a scraper plate, which is L-shaped and has a groove at its horizontal end that is opposite to the top rod.

6. The seed discharging device for a drum seeder according to claim 5, characterized in that: A conical disc is fixedly installed at the top of the conduit, and the bottom of the scraper is fixedly connected to the top of the conical disc.

7. The seed discharging device for a drum seeder according to claim 6, characterized in that: The inner wall of the card slot is equipped with a sponge brush.

8. The seed discharging device for a drum seeder according to claim 1, characterized in that: The ends of both top rod one and top rod two away from the insert plate are arc-shaped, and the two sides of the opening below the sleeve are provided with bevels.

9. The seed discharging device for a drum seeder according to claim 1, characterized in that: The springs are in multiple sets and are arranged at intervals along the length of the insert plate.

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