Narrow row spacing seeding frame suitable for high density crop planting

Abstract

The utility model discloses a narrow row spacing seeding frame suitable for high density crop planting relates to the field of agricultural machinery, including cuboid seed tank and the gathering notch of inside opening in the bottom center place of cuboid seed tank, the bottom outside of gathering notch is provided with semicircular seed sowing cover, and semicircular seed sowing cover is fixed in the bottom of cuboid seed tank, the front and back both ends of semicircular seed sowing cover all are fixed with the sealing bearing plate, the inside of semicircular seed sowing cover is provided with the seed roller in the longitudinal direction, the inside of seed roller circular outer wall is provided with multiple groups seed reservation hole at equal intervals, the front and back both ends center of seed roller all are provided with the roller shaft, through increasing novel follow -up uniformity dredging device above the gathering notch for gathering crop seeds, the device can be synchronous linkage with seed roller, and the even distribution of seeds is the core, and the dredging anti -block is assisted, ensures that the seed accurate access seed roller's seed reservation hole, improves the seeding uniformity and the seed stability greatly, avoids the problem such as the missed sowing, the little sowing.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery technology, specifically relating to a narrow-row planting frame suitable for high-density crop planting. Background Technology

[0002] Narrow-row planting racks, suitable for high-density crop cultivation, are a key component of modern agricultural planting equipment. They are mainly used in conjunction with seeders for planting densely planted crops such as corn and soybeans. Their core advantage lies in optimizing row spacing (e.g., 30-50cm narrow row spacing combined with wide ventilation belts) to increase the number of plants per unit area within a limited land area (density per acre can be increased by 10%-15%), while ensuring ventilation and light penetration during crop growth. This achieves the dual goals of high-density planting and efficient resource utilization, making them an important equipment support for current large-scale and precision agricultural planting. They are widely used in large-scale farms and cooperatives in major grain-producing areas such as Northeast and North China.

[0003] However, in the core process of seed transfer from the seed box to sowing, existing narrow-row planting racks are prone to seed stagnation in the corners of the rectangular seed box due to differences in the stacking angle and particle flowability. This leads to uneven seed supply at the collection slot. Even with inclined guide plates, seeds can only be initially gathered at the collection slot, and cannot be accurately distributed to the seed retention holes of the seed discharge roller. This often results in some seed retention holes being empty (with an emptying rate of 10%-15%) and some seed retention holes having multiple seeds piled up. This leads to missed sowing, broken rows, or multiple seedlings competing for fertilizer in the field, seriously affecting the yield stability of high-density planting. Utility Model Content

[0004] The purpose of this invention is to provide a narrow-row spacing seeding rack suitable for high-density crop planting, in order to solve the problems mentioned in the background art, such as seeds being easily stuck in the corners of the rectangular seed box, uneven seed supply at the seed collection slot, and the inclined guide plate only initially gathering the seeds, making it difficult to accurately distribute them to the seed retention hole of the seed discharge roller, resulting in missed sowing and broken rows in the field, which affects yield.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a narrow-row planting rack suitable for high-density crop planting, comprising a cuboid seed box and a gathering slot opened inside the center of the bottom end of the cuboid seed box. A semi-circular seed metering cover is provided outside the bottom end of the gathering slot, and the semi-circular seed metering cover is fixed to the bottom end of the cuboid seed box. Sealing bearing plates are fixed at both the front and rear ends of the semi-circular seed metering cover. A seed-discharging roller is longitudinally arranged inside the semi-circular seed metering cover. Multiple sets of seed retention holes are equidistantly arranged inside the circular outer wall of the seed-discharging roller. A roller shaft is provided at the center of both the front and rear ends of the seed-discharging roller, and two roller shafts are respectively inserted into bearings inside two sealing bearing plates. The roller shaft at the front end of the seed-discharging roller passes through the sealing bearing plate at the front end of the semi-circular seed metering cover. A follow-up equalization and unblocking device is provided above the gathering slot.

[0006] Preferably, the follow-up equal distribution and unblocking device includes a fixed bearing seat and an unblocking shaft. There are two fixed bearing seats, which are symmetrically fixed on the outer walls of the front and rear ends of the lower side of the center of the cuboid seed box. The two fixed bearing seats are connected by an internal bearing and the unblocking shaft is located above the collection groove.

[0007] Preferably, the follow-up equal distribution and unblocking device further includes multiple sets of equal distribution stirring rods, which are fixed at equal intervals from front to back on the circular outer wall of the unblocking shaft, and the multiple sets of equal distribution stirring rods are staggered with the multiple sets of seed retention holes, that is, a single set of equal distribution stirring rods is located at the center between two adjacent sets of seed retention holes.

[0008] Preferably, the follow-up equal distribution and unblocking device further includes a transmission belt and pulleys. A pulley is sleeved and fixed to the outside of the front end of the unblocking shaft, and a pulley is also sleeved and fixed to the outside of the front end of the seed discharge roller. The two pulleys are arranged symmetrically between each other, and the two pulleys are connected by transmission belt.

[0009] Preferably, when the seed-discharging roller rotates clockwise or counterclockwise, it can drive the unblocking shaft to rotate synchronously through the transmission action of the pulley and the transmission belt. During the rotation of the unblocking shaft, the multiple sets of evenly distributed stirring rods do not come into contact with the collection trough and the seed-discharging roller.

[0010] Preferably, a transmission gear is fixed to the outermost front end of the roller shaft at the front end of the seed discharge roller. The transmission gear is connected to an external power supply gear. The circular outer wall of the seed discharge roller is close to but does not directly contact the inner wall of the semi-circular seed discharge cover.

[0011] Preferably, the inner walls of both the left and right ends of the cuboid seed box are provided with inclined guide plates. Both inclined guide plates are inclined toward the direction of the gathering trough, and the bottom ends of the two inclined guide plates are respectively fixed to the left and right ends of the top opening of the gathering trough. The two inclined guide plates can guide and gather the crop seeds toward the direction of the gathering trough.

[0012] Preferably, the outer walls at both ends of the cuboid seed box are fixed with support plates, and the bottom of both ends of the two support plates are provided with mounting brackets. The mounting brackets are all fixed to the corresponding installation positions of the seeder with screws.

[0013] Preferably, the bottom end of the semi-circular seed metering hood is provided with a plurality of externally threaded seed outlets at equal intervals from front to back. The plurality of externally threaded seed outlets are all connected to the interior of the semi-circular seed metering hood. The plurality of externally threaded seed outlets correspond one-to-one with the seed retention holes inside the seed roller, that is, the plurality of externally threaded seed outlets are located directly below the seed retention holes corresponding to their positions.

[0014] Preferably, each of the plurality of externally threaded seed outlet heads is threadedly fitted with an internally threaded connecting sleeve, the bottom end of each of the plurality of internally threaded connecting sleeves is connected to a seed metering tube, the bottom end of each of the plurality of seed metering tubes is provided with a seeding head, and the top of each of the plurality of seeding heads is provided with a cross-shaped flange, the cross-shaped flange being fixed to a bracket for fixing the seeding head by screws.

[0015] Compared with the prior art, this utility model provides a narrow row spacing seeding rack suitable for high-density crop planting, which has the following beneficial effects:

[0016] This invention adds a novel follow-up even distribution and unblocking device above the seed collection slot for crop seeds. This device can be synchronously linked with the seed discharge roller, with even seed distribution and aggregation as the core and unblocking and anti-clogging as the auxiliary, ensuring that seeds accurately enter the seed retention holes of the seed discharge roller, greatly improving sowing uniformity and seeding stability, and avoiding missed or insufficient sowing. The core advantage of the follow-up even distribution and unblocking device lies in its structural design to achieve directional aggregation of seeds to the seed retention holes. Multiple sets of even distribution stirring rods are fixed at equal intervals from front to back on the unblocking rotating shaft, and are staggered with the multiple sets of seed retention holes of the seed discharge roller (each set of even distribution stirring rods is located adjacent to the seed retention hole). At the center between the two sets of seed retention holes, when the seed discharge roller receives external power to rotate through the transmission gear, it will drive the unblocking shaft to rotate synchronously through the pulley and transmission belt. At this time, the evenly distributed stirring rod rotates with the shaft, and its rotation trajectory just covers the seed distribution area above the collection trough. It can push and gather the seeds scattered in the collection trough towards the adjacent seed retention holes on both sides. This staggered pushing principle can ensure that each seed retention hole can be fully filled with seeds during the rotation of the seed discharge roller, so as to increase the filling rate and avoid some seed retention holes being empty due to uneven seed distribution, thus ensuring the consistency of sowing plant spacing from the source.

[0017] This follow-up equalization and unblocking device adopts a follow-up design. The power of the unblocking shaft comes directly from the seed discharge roller. The roller shaft at the front end of the seed discharge roller is connected to the pulley at the front end of the unblocking shaft through a transmission belt. When the seed discharge roller rotates clockwise and counterclockwise, it will synchronously drive the unblocking shaft to rotate at the same rhythm. The advantage of this linkage principle is that the rotation speed of the equalization stirring rod is perfectly matched with the seed discharge speed of the seed discharge roller. When the seeder adjusts its travel speed (i.e., the speed of the seed discharge roller changes), the pushing frequency of the equalization stirring rod will also change synchronously, always keeping the pushing amount and the seed discharge amount matched. It will not cause seed accumulation due to pushing too fast, or cause insufficient seed supply to the seed retention hole due to pushing too slow, ensuring stable and uniform seed discharge throughout the entire sowing process, and adapting to the sowing speed requirements of different crops (such as corn and soybeans).

[0018] Although the unblocking function of the device is secondary, it effectively prevents seeds from clumping and clogging in the collection slot while evenly distributing and aggregating them. The collection slot is the key channel for seeds to enter the seed discharge roller from the cuboid seed box. If seeds accumulate locally due to differences in humidity and particle size, blockage can easily occur, leading to sowing interruption. During rotation, the evenly distributing stirring rod continuously agitates and loosens the seeds above the collection slot, breaking up seed clumps and pushing the seeds towards the seed discharge roller, preventing seeds from lingering at the top opening of the collection slot. In addition, the rotation trajectory of the unblocking shaft and the evenly distributing stirring rod is precisely designed to avoid contact with the inner wall of the collection slot and the outer wall of the seed discharge roller, thus avoiding wear on components and ensuring moderate agitation force on the seeds without damaging their integrity, thus balancing unblocking effect and seed protection. Attached Figure Description

[0019] Figure 1 This is a right-side perspective three-dimensional structural diagram of the narrow-row-spacing seeding rack suitable for high-density crop planting according to this utility model.

[0020] Figure 2 This is a right-side plan view of the narrow-row planting rack of this utility model, which is suitable for high-density crop planting.

[0021] Figure 3 This is a bottom-view three-dimensional structural diagram of the narrow-row planting rack suitable for high-density crop planting according to this utility model.

[0022] Figure 4 This is a cross-sectional three-dimensional structural diagram of the narrow-row planting frame suitable for high-density crop planting according to this utility model.

[0023] Figure 6 This is a schematic diagram of the overall three-dimensional structure of the follow-up and equal distribution unblocking device of this utility model.

[0024] Figure 5 This is a three-dimensional structural diagram of the transmission component of the follow-up equal distribution and unblocking device of this utility model.

[0025] In the diagram: 1. Inclined guide plate; 2. Rectangular seed box; 3. Support plate; 4. Follow-up equal distribution and unblocking device; 5. Transmission gear; 6. Roller shaft; 7. Sealing bearing plate; 8. Mounting bracket; 9. Seed dispensing pipe; 10. Seeding head; 11. Cross-shaped flange; 12. Semi-circular seed dispensing cover; 13. Externally threaded seed outlet head; 14. Internally threaded connecting sleeve; 15. Seed dispensing roller; 16. Seed retention hole; 17. Gathering groove; 18. Fixed bearing seat; 19. Unblocking shaft; 20. Equal distribution stirring rod; 21. Transmission belt; 22. Pulley. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This utility model provides, for example Figure 1-6 The narrow-row planting rack shown is suitable for high-density crop planting. This rack is designed with precise seed control and efficient sowing as its core features. Through modular structure and mechanical linkage, it achieves full-process control over seeds from storage, guidance, and even distribution to precise sowing. It is suitable for the narrow-row planting needs of high-density crops such as corn and soybeans. The rectangular seed box 2 is the core seed storage component, capable of holding a sufficient quantity of crop seeds to meet the needs of long-term continuous sowing. Support plates 3 are fixed to the outer walls of both the front and rear ends of the rectangular seed box 2, and mounting brackets 8 are provided at the bottom of both the left and right ends of the support plates 3. The principle of the cooperation between the support plates 3 and the mounting brackets 8 is that the entire planting rack is fixed to the planting rack through the screw holes on the mounting brackets 8. The machine is installed at the corresponding position to form a stable support structure, which avoids the sowing frame from shifting due to equipment vibration during the sowing process and ensures accurate sowing row spacing. The inner walls of both ends of the rectangular seed box 2 are equipped with inclined guide plates 1. Both inclined guide plates 1 are inclined towards the gathering slot 17, and their bottom ends are fixed to the left and right ends of the top opening of the gathering slot 17, respectively. The principle of the inclined design is to use gravity to guide and gather the seeds scattered in the rectangular seed box 2 towards the central gathering slot 17. When the seeds accumulate in the seed box, they will slide down the inclined surface of the inclined guide plate 1, avoiding the seeds from being stuck in the corners of the seed box, ensuring that there is always a sufficient supply of seeds at the gathering slot 17, providing a basis for the subsequent equal distribution and seeding process, while reducing seed residue and improving seed utilization.

[0028] like Figure 1 and Figure 4As shown, a semi-circular seed discharge cover 12 is fixed below the gathering slot 17 at the center of the bottom of the cuboid seed box 2. Sealing bearing plates 7 are fixed at both the front and rear ends of the cover. A seed discharge roller 15 is longitudinally arranged inside. The semi-circular seed discharge cover 12 forms a closed seed discharge space to prevent seeds from scattering during the discharge process. The bearings inside the sealing bearing plate 7 cooperate with the roller shafts 6 at both ends of the seed discharge roller 15, providing rotational support for the seed discharge roller 15 and reducing rotational friction. The roller shaft 6 at the front end of the seed discharge roller 15 passes through the sealing bearing plate 7, and a transmission gear 5 is fixed to the outermost front end. The transmission gear 5 is connected to an external power supply gear, and its power transmission principle is... External power (such as the power of the seeder's gearbox) drives the roller shaft 6 to rotate through the transmission gear 5, which in turn drives the seed roller 15 to rotate synchronously. The rotation speed can be adjusted by the seeder's travel speed (the faster the travel speed, the higher the rotation speed of the seed roller 15 and the greater the seed output), adapting to different sowing density requirements. The circular outer wall of the seed roller 15 is close to but does not directly contact the inner wall of the semi-circular seed metering cover 12. The principle of this close-range non-contact design is to avoid friction between the seed roller 15 and the semi-circular seed metering cover 12, which would cause wear on the parts, and to prevent seeds from getting stuck between the two through a small gap, ensuring that the seed roller 15 rotates smoothly and that the seeds enter the seed retention hole 16 smoothly.

[0029] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the seed roller 15 has multiple sets of seed retention holes 16 evenly spaced inside its circular outer wall. The number and diameter of each set of seed retention holes 16 are designed according to the size of the crop seeds. The working principle of the seed retention holes 16 is to quantitatively extract seeds. When the seed roller 15 rotates, the seed retention holes 16, when rotating with the roller body to below the collecting groove 17, will receive the seeds pushed by the equalizing stirring rod 20. When the seed retention holes 16 rotate to the bottom of the semi-circular seed metering cover 12, the seeds fall from the seed retention holes 16 under the action of gravity, realizing quantitative seed extraction and ensuring accurate seed usage for each crop, avoiding over-sowing or under-sowing. The bottom of the semi-circular seed metering cover 12 has multiple externally threaded seed outlet heads 13 evenly spaced from front to back. All of the multiple externally threaded seed outlet heads 13 are connected to the semi-circular seed metering cover. The internal connection of 12 is one-to-one with the seed retention holes 16 of the seed discharge roller 15 (the external thread seed discharge head 13 is located directly below the corresponding seed retention hole 16). The principle of the one-to-one correspondence design is to ensure that the seeds falling from the seed retention hole 16 can accurately enter the external thread seed discharge head 13, avoid the seeds from deviating during the falling process, and ensure the smooth flow of the seed discharge channel. The external thread of the external thread seed discharge head 13 is fitted with an internal thread connecting sleeve 14. The bottom end of the internal thread connecting sleeve 14 is connected to the seed discharge tube 9. The principle of the threaded connection is to facilitate disassembly and replacement. When the seed discharge tube 9 is blocked or worn, the internal thread connecting sleeve 14 can be quickly unscrewed for maintenance. At the same time, seed discharge tubes of different lengths can be replaced according to the sowing depth requirements to improve the adaptability of the equipment.

[0030] like Figure 1 and Figure 4 As shown, a seeding head 10 is provided at the bottom of the seed metering pipe 9. A cross-shaped flange 11 is provided on the top of the seeding head 10. It is fixed to the bracket for fixing the seeding head 10 by screws. The working principle of the cross-shaped flange 11 is to increase the contact area between the seeding head 10 and the bracket. The seeding head 10 is fixed by multiple sets of screws to ensure that it is installed firmly and to prevent the seeding head 10 from shifting due to vibration during the sowing process. This ensures accurate sowing row spacing. The bottom opening of the seeding head 10 is designed to meet the needs of narrow row spacing planting. After the seeds fall into the seeding head 10 through the seed metering pipe 9, they will be accurately sown into the soil along the guide channel of the seeding head 10, realizing narrow row spacing planting with one seed per row. Combined with the quantitative seed dispensing of the seeding roller 15, the precise sowing effect of high-density crops is finally achieved.

[0031] like Figure 1 , Figure 5 and Figure 6 As shown, the collecting slot 17 is the key channel for seeds to enter the seed dispensing system from the cuboid seed box 2. Above it is a follow-up equalizing and unblocking device 4, whose core function is to accurately distribute the collected seeds to the seed retention holes 16 of the seed dispensing roller 15, while preventing blockage. The follow-up equalizing and unblocking device 4 includes fixed bearing seats 18 and unblocking shaft 19. Two fixed bearing seats 18 are symmetrically fixed to the lower front and rear outer walls at the center of the cuboid seed box 2, and are connected to the unblocking shaft 19 via internal bearings. The main body of the unblocking shaft 19 is located above the collecting slot 17. The working principle of the fixed bearing seats 18 is to provide stable rotational support for the unblocking shaft 19. The bearing connection can... To reduce frictional resistance during the rotation of the unblocking shaft 19 and ensure smooth, unimpeded rotation, the follow-up unblocking device 4 also includes a transmission belt 21 and pulleys 22. The front end of the unblocking shaft 19 and the front end of the seed roller 6 of the seed discharge roller 15 are both fitted with pulleys 22. The two pulleys 22 are symmetrical and connected by the transmission belt 21. The principle of this transmission design is to achieve follow-up linkage. When the seed discharge roller 15 is driven to rotate by external power, it will drive the unblocking shaft 19 to rotate synchronously through the pulleys 22 and the transmission belt 21, ensuring that the speed of the unblocking shaft 19 is completely matched with that of the seed discharge roller 15, and avoiding uneven seed distribution due to speed differences.

[0032] like Figure 1 , Figure 5 and Figure 6As shown, multiple sets of evenly distributed stirring rods 20 are fixed at equal intervals from front to back on the circular outer wall of the unblocking shaft 19. These evenly distributed stirring rods 20 and the multiple sets of seed retention holes 16 on the seed discharge roller 15 are arranged in an alternating pattern (each evenly distributed stirring rod 20 is located at the center between two adjacent sets of seed retention holes 16). The principle of this alternating arrangement is that when the evenly distributed stirring rods 20 rotate with the unblocking shaft 19, their rotation trajectory precisely covers the seed distribution area below the gathering trough 17, pushing and gathering the collected seeds towards the adjacent seed retention holes 16 on both sides, ensuring that each seed retention hole 16 is filled with seeds. The seeds are fully filled, and during the rotation of the unblocking shaft 19, the equal distribution stirring rod 20 does not contact the collection trough 17 and the seed discharge roller 15. This avoids wear on the parts and damage to the seeds, balancing the distribution accuracy and seed integrity. In addition, the equal distribution stirring rod 20 also has an auxiliary unblocking function. If the seeds clump together in the collection trough 17 due to differences in humidity and particle size, the rotation of the equal distribution stirring rod 20 can turn and loosen the seeds, break up the clumps, and push the seeds to flow towards the seed discharge roller 15, preventing the collection trough 17 from becoming blocked and causing sowing interruption, thus ensuring the continuity of sowing.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A narrow-row planting rack suitable for high-density crop planting, comprising a rectangular seed box (2) and a gathering slot (17) located inside the center of the bottom end of the rectangular seed box (2), wherein a semi-circular seed metering cover (12) is provided on the outside of the bottom end of the gathering slot (17), and the semi-circular seed metering cover (12) is fixed to the bottom end of the rectangular seed box (2), and sealing bearing plates (7) are fixed at both the front and rear ends of the semi-circular seed metering cover (12). (12) A seed-exiting roller (15) is arranged longitudinally inside. Multiple sets of seed retention holes (16) are equidistantly arranged inside the circular outer wall of the seed-exiting roller (15). Roller shafts (6) are arranged at the center of both the front and rear ends of the seed-exiting roller (15), and the two roller shafts (6) are respectively inserted into the bearings inside two sealing bearing plates (7). The roller shaft (6) at the front end of the seed-exiting roller (15) passes through the sealing bearing plate (7) at the front end of the semi-circular seed-discharging cover (12). Its characteristic is that: A follow-up equal distribution and unblocking device (4) is provided above the collection trough (17); The following uniform distribution and unblocking device (4) includes a fixed bearing seat (18) and an unblocking shaft (19). There are two fixed bearing seats (18). The two fixed bearing seats (18) are symmetrically fixed on the outer walls of the front and rear ends of the lower side of the center of the cuboid seed box (2). The two fixed bearing seats (18) are connected by an internal bearing and the unblocking shaft (19) is located above the collection slot (17).

2. The narrow-row-spacing seeding rack for high-density crop planting according to claim 1, characterized in that: The following uniform distribution and unblocking device (4) also includes multiple sets of uniform distribution stirring rods (20). The multiple sets of uniform distribution stirring rods (20) are fixed at equal intervals from front to back on the circular outer wall of the unblocking rotating shaft (19). The multiple sets of uniform distribution stirring rods (20) and the multiple sets of seed retention holes (16) are staggered with each other, that is, a single set of uniform distribution stirring rods (20) is located at the center between two adjacent sets of seed retention holes (16).

3. The narrow-row spacing seeding rack suitable for high-density crop planting according to claim 2, characterized in that: The following uniform distribution and unblocking device (4) also includes a transmission belt (21) and a pulley (22). The pulley (22) is sleeved and fixed on the front end of the unblocking shaft (19). The pulley (22) is also sleeved and fixed on the front end of the roller shaft (6) of the seed discharge roller (15). The two pulleys (22) are arranged symmetrically between each other, and the two pulleys (22) are connected by transmission belt (21).

4. The narrow-row-spacing seeding rack suitable for high-density crop planting according to claim 3, characterized in that: When the seed-discharging roller (15) rotates clockwise and counterclockwise, it can drive the unblocking shaft (19) to rotate synchronously through the transmission action of the pulley (22) and the transmission belt (21). During the rotation of the unblocking shaft (19), the multiple sets of equal-distribution stirring rods (20) do not contact the gathering trough (17) and the seed-discharging roller (15).

5. The narrow-row-spacing seeding rack suitable for high-density crop planting according to claim 4, characterized in that: The outermost front end of the roller shaft (6) at the front end of the seed-producing roller (15) is fixed with a transmission gear (5). The transmission gear (5) is connected to the external power supply gear. The circular outer wall of the seed-producing roller (15) is close to but does not directly contact the inner wall of the semi-circular seed-discharging cover (12).

6. The narrow-row-spacing seeding rack for high-density crop planting according to claim 1, characterized in that: The rectangular seed box (2) is provided with inclined guide plates (1) on the inner walls of both the left and right ends. Both inclined guide plates (1) are inclined towards the gathering trough (17), and the bottom ends of the two inclined guide plates (1) are fixed to the left and right ends of the top opening of the gathering trough (17). The two inclined guide plates (1) can guide and gather the crop seeds towards the gathering trough (17).

7. The narrow-row-spacing seeding rack suitable for high-density crop planting according to claim 6, characterized in that: The rectangular seed box (2) has bracket plates (3) fixed on the outer walls at both ends, and mounting brackets (8) are provided at the bottom of both ends of the two bracket plates (3). The mounting brackets (8) are fixed to the corresponding installation positions of the seeder by screws.

8. The narrow-row spacing seeding rack for high-density crop planting according to claim 1, characterized in that: The bottom of the semi-circular seed metering cover (12) is provided with multiple external thread seed outlet heads (13) at equal intervals from front to back. The multiple external thread seed outlet heads (13) are all connected to the interior of the semi-circular seed metering cover (12). The multiple external thread seed outlet heads (13) correspond one-to-one with the seed retention holes (16) inside the seed roller (15). That is, the multiple external thread seed outlet heads (13) are located directly below the seed retention holes (16) corresponding to their positions.

9. The narrow-row-spacing seeding rack for high-density crop planting according to claim 8, characterized in that: Each of the externally threaded seed heads (13) is threaded with an internally threaded connecting sleeve (14). The bottom of each of the internally threaded connecting sleeves (14) is connected to a seeding tube (9). The bottom of each of the seeding tubes (9) is provided with a seeding head (10). The top of each of the seeding heads (10) is provided with a cross-shaped flange (11). The cross-shaped flange (11) is fixed to the bracket used to fix the seeding head (10) by screws.

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