Hole fertilization automatic seed alignment regulation and control device based on planetary gear train

Abstract

The invention discloses a hole fertilization automatic seed alignment regulation and control device based on a planetary gear train, which comprises the planetary gear train, a fertilizer discharge chain wheel, a bearing seat assembly, a seed discharge chain wheel, a regulation and control motor, a fertilizer discharge driven chain wheel and a seed discharge driving chain wheel, a seed-metering driving chain wheel and a seed-metering chain wheel synchronously rotate through chain transmission, and the seed-metering chain wheel and a fertilizer-metering chain wheel guarantee a fixed transmission ratio through a planetary gear train, so that the seed distance and the fertilizer distance are equal; when it is detected that the positions of the seeds and the fertilizer deviate, the regulation and control motor drives the fertilizer discharging chain wheel to deflect by a certain angle relative to the seed discharging chain wheel, that is, the fertilizer deviates by a certain distance relative to the seeds, so that the positions of the seeds and the fertilizer correspond again, at the moment, the regulation and control motor is locked, and the seed discharging chain wheel and the fertilizer discharging chain wheel continue to work in a fixed transmission ratio.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural machinery, and more specifically, to an automatic seed-adjusting control device for hole-fertilization based on a planetary gear system. Background Art

[0002] At present, the existing hole-fertilizing seeders are difficult to meet the actual operation requirements in terms of fertilizer discharge stability, seed-fertilizer spacing stability and soil penetration performance when performing precision seeding and fertilization operations due to the complex working terrain and diverse soil conditions. In the process of seeds and fertilizers being thrown from the seed-dispenser and fertilizer-dispenser to the seed ditch and fertilizer ditch, the position and spacing of seeds and fertilizers in the soil layer are difficult to accurately control due to factors such as terrain and bumps, and irregular movements such as jumping and rolling often occur in the seed ditch and fertilizer ditch, making it difficult to achieve the ideal seed-fertilizer position distribution. With the continuous development of agricultural machinery technology, higher requirements are put forward for the operating speed and sowing accuracy of seeding machines. However, when the operating speed increases, especially under poor soil conditions, the synchronization of seeds and fertilizers will further decrease, and the irregularity of seed-fertilizer movement will intensify. Due to the lack of accurate positioning and monitoring means, the relative position and spacing of seeds and fertilizers in the soil layer cannot be obtained, resulting in problems such as seed burning, uneven crop growth, and seedling and fertilizer leakage, making it difficult to achieve the ideal seed-fertilizer distribution, thereby affecting the yield increase effect.

[0003] At present, the common method to achieve the distribution of seed fertilizer in a fixed relative position is to complete it through a hole-piercing mechanism, but the existing hole-piercing mechanism has insufficient target recognition ability and it is difficult to ensure the stable control of the spacing between seedlings and fertilizers. In areas with complex terrain, artificial hole fertilization is used, which increases labor intensity and reduces work efficiency.

[0004] To sum up, how to achieve accurate matching and stable control of seed and fertilizer positions under complex terrain and variable soil conditions has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to overcome a series of defects in the prior art, the purpose of the present application is to provide an automatic seed-matching control device for hole fertilization based on a planetary gear system for the above-mentioned problems, including a planetary gear system, a fertilizer discharge sprocket 1, a bearing seat assembly, a seed discharge sprocket 5, a control motor 14, a fertilizer discharge driven sprocket 15 and a seed discharge active sprocket 16, the fertilizer discharge driven sprocket 15 and the fertilizer discharge sprocket 1 rotate synchronously through a chain drive, and the seed discharge active sprocket 16 and the seed discharge sprocket 5 rotate synchronously through a chain drive, and the seed discharge sprocket 5 and the fertilizer discharge sprocket 1 ensure a fixed transmission ratio through a planetary gear system to ensure that the seed spacing and the fertilizer spacing are equal; when a deviation in the position of the seed and the fertilizer is detected, the control motor 14 drives the fertilizer discharge sprocket 1 to deflect a certain angle relative to the seed discharge sprocket 5, that is, the fertilizer is offset by a certain distance relative to the seed, so that the seed and fertilizer positions correspond again, and at this time, the control motor 14 is locked, while the seed discharge sprocket 5 and the fertilizer discharge sprocket 1 continue to work at a fixed transmission ratio.

[0006] Furthermore, the planetary gear train includes a sun gear shaft 2, a planet carrier shaft 4, a planet gear shaft 6, a sun gear 7, an outer gear ring 8 and planetary wheels, the planetary wheels are all meshed with the sun gear 7 externally, the planetary wheels are all meshed with the outer gear ring 8 internally, the planetary wheels are all axially fixed to the planet carrier shaft 4 via an axial ring, the planetary wheels form a rotating pair with the planet carrier shaft 4, the sun gear 7 is connected to the sun gear shaft 2 via a flat key, and the shaft of the outer gear ring 8 is connected to the regulating sprocket 9 via a flat key.

[0007] Furthermore, the seeding sprocket 5 is connected to the planetary frame shaft 4 via a flat key, the seeding sprocket 5 is connected to the planetary wheel shaft 6 via the planetary frame shaft 4, and the fertilizer sprocket 1 is connected to the sun wheel shaft 2 via a flat key.

[0008] Furthermore, the central axes of the planetary gear train, the seeding sprocket 5, the fertilizer discharging sprocket 1 and the regulating sprocket 9 are in a straight line.

[0009] Furthermore, the sun gear shaft 2 and the planet carrier shaft 4 are axially fixed by bearings and bearing seat assemblies, respectively, thereby forming a stable support and lateral structure to ensure smooth and reliable operation of the seeding drive.

[0010] Furthermore, the regulating motor 14 is located on one side of the planetary gear system, the seed sprocket 5, the fertilizer sprocket 1 and the regulating sprocket 9. The regulating motor 14 cooperates with the regulating driving sprocket 13 through a flat key to achieve synchronization of the output speed of the regulating motor 14 and the rotation phase of the regulating sprocket 9.

[0011] Furthermore, the regulating driving sprocket 13 and the regulating sprocket 9 are located in the same longitudinal plane and transmit power through chain drive.

[0012] Furthermore, when it is detected that the seed and fertilizer positions correspond to each other, the shaft of the outer gear ring 8 is locked, and under the drive of the seed sprocket 5, the planetary carrier shaft 4 rotates, the sun gear 7 rotates drivenly, and the sun gear 7 rotates synchronously with the sun gear shaft 2 to synchronously transmit the rotation phase to the fertilizer sprocket 1, and the fertilizer driven sprocket 15 transmits the rotation phase to the fertilizer plate through the flat key matching transmission, so that the seed spacing and fertilizer spacing are equal and synchronous and the relative positions of the seed and fertilizer are ensured to correspond to each other;

[0013] When a deviation in the position of the seed and fertilizer is detected, the regulating motor 14 drives the regulating active sprocket 13 to rotate, and the regulating active sprocket 13 and the regulating sprocket 9 rotate synchronously through chain transmission. The regulating sprocket 9 drives the outer gear ring 8 through a short acceleration and deceleration process through a flat key transmission. At this time, the planetary carrier shaft 4 does not rotate, the sun gear 7 rotates a certain angle, and the sun gear 7 drives the fertilizer sprocket 1 to rotate synchronously. The fertilizer driven sprocket 15 and the fertilizer disk are connected with the seed disk through a flat key, so that the fertilizer disk rotates more or less than a certain angle relative to the seed disk, so that the seed and fertilizer positions correspond to each other, and the regulating motor 14 is locked. The process of corresponding seed and fertilizer is repeated, and the seed disk and the fertilizer disk continue to work with a fixed transmission ratio.

[0014] Compared with the prior art, this application has the following beneficial effects:

[0015] 1) Through the cooperation of the planetary gear train and the drive motor, the seeding disc and the fertilizer disc are rotated synchronously, and at the same time, the seeding disc is accurately adjusted to a certain phase difference relative to the fertilizer disc, so as to achieve the effect of synchronous sowing and fertilization and fixed-point equidistant fertilization;

[0016] 2) When the drive motor is working, the seed disc remains relatively stationary for a very short time to prevent the rotation angle of the fertilizer sprocket relative to the seed sprocket from deviating too much or too little from the calculated value, thereby avoiding the accumulation of adjustment errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of an automatic seed-control device for hole-fertilization based on a planetary gear system disclosed in an embodiment of the present application;

[0018] Figure 2 It is an assembly relationship diagram of an automatic seed-matching control device for hole fertilization based on a planetary gear system disclosed in an embodiment of the present application;

[0019] Figure 3 This is a structural diagram of the position of a bearing seat of an automatic seed-to-seed control device for hole fertilization based on a planetary gear system disclosed in an embodiment of the present application;

[0020] Figure 4 This is a simplified diagram of a single unit device for hole-type sowing and fertilization in an embodiment of the present application.

[0021] The accompanying drawings in the figure are marked as follows:

[0022] 1-fertilizer discharge sprocket, 2-sun gear shaft, 3-bearing seat assembly, 4-planet carrier shaft, 5-seed discharge sprocket, 6-planet gear shaft, 7-sun gear, 8-outer gear ring, 9-regulating sprocket, 10-frame, 11-bearing, 13-regulating active sprocket, 14-regulating motor, 15-fertilizer discharge driven sprocket, 16-seed discharge active sprocket;

[0023] 301-bearing seat A, 302-bearing seat B, 303-bearing seat C, 304-bearing seat D;

[0024] 1201-flat key A, 1202-flat key B, 1203-flat key C, 1204-flat key D. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments.

[0026] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0027] The embodiments and directional terms described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0028] In a broad embodiment of the present invention, an automatic seed-matching control device for hole fertilization based on a planetary gear train comprises a planetary gear train, a fertilizer discharge sprocket 1, a bearing seat assembly, a seed discharge sprocket 5, a control motor 14, a fertilizer discharge driven sprocket 15 and a seed discharge active sprocket 16, wherein the fertilizer discharge driven sprocket 15 rotates synchronously with the fertilizer discharge sprocket 1 through a chain drive, and the seed discharge active sprocket 16 rotates synchronously with the seed discharge sprocket 5 through a chain drive, and the seed discharge sprocket 5 and the fertilizer discharge sprocket 1 ensure a fixed transmission ratio through the planetary gear train to ensure that the seed spacing and the fertilizer spacing are equal; when a deviation in the position of the seed and the fertilizer is detected, the control motor 14 drives the fertilizer discharge sprocket 1 to deflect by a certain angle relative to the seed discharge sprocket 5, that is, the fertilizer is offset by a certain distance relative to the seed, so that the seed and fertilizer positions correspond again, and at this time, the control motor 14 is locked, while the seed discharge sprocket 5 and the fertilizer discharge sprocket 1 continue to work at a fixed transmission ratio.

[0029] Furthermore, the planetary gear train includes a sun gear shaft 2, a planet carrier shaft 4, a planet gear shaft 6, a sun gear 7, an outer gear ring 8 and planetary wheels, the planetary wheels are all meshed with the sun gear 7 externally, the planetary wheels are all meshed with the outer gear ring 8 internally, the planetary wheels are all axially fixed to the planet carrier shaft 4 via an axial ring, the planetary wheels form a rotating pair with the planet carrier shaft 4, the sun gear 7 is connected to the sun gear shaft 2 via a flat key, and the shaft of the outer gear ring 8 is connected to the regulating sprocket 9 via a flat key.

[0030] Furthermore, the seeding sprocket 5 is connected to the planetary frame shaft 4 via a flat key, the seeding sprocket 5 is connected to the planetary wheel shaft 6 via the planetary frame shaft 4, and the fertilizer sprocket 1 is connected to the sun wheel shaft 2 via a flat key.

[0031] Furthermore, the central axes of the planetary gear train, the seeding sprocket 5, the fertilizer discharging sprocket 1 and the regulating sprocket 9 are in a straight line.

[0032] Furthermore, the sun gear shaft 2 and the planet carrier shaft 4 are axially fixed by bearings and bearing seat assemblies, respectively, thereby forming a stable support and lateral structure to ensure smooth and reliable operation of the seeding drive.

[0033] Furthermore, the regulating motor 14 is located on one side of the planetary gear system, the seed sprocket 5, the fertilizer sprocket 1 and the regulating sprocket 9. The regulating motor 14 cooperates with the regulating driving sprocket 13 through a flat key to achieve synchronization of the output speed of the regulating motor 14 and the rotation phase of the regulating sprocket 9.

[0034] Furthermore, the regulating driving sprocket 13 and the regulating sprocket 9 are located in the same longitudinal plane and transmit power through chain drive.

[0035] Furthermore, when it is detected that the seed and fertilizer positions correspond to each other, the shaft of the outer gear ring 8 is locked, and under the drive of the seed sprocket 5, the planetary carrier shaft 4 rotates, the sun gear 7 rotates drivenly, and the sun gear 7 rotates synchronously with the sun gear shaft 2 to synchronously transmit the rotation phase to the fertilizer sprocket 1, and the fertilizer driven sprocket 15 transmits the rotation phase to the fertilizer plate through the flat key matching transmission, so that the seed spacing and fertilizer spacing are equal and synchronous and the relative positions of the seed and fertilizer are ensured to correspond to each other;

[0036] When a deviation in the position of the seed and fertilizer is detected, the regulating motor 14 drives the regulating active sprocket 13 to rotate, and the regulating active sprocket 13 and the regulating sprocket 9 rotate synchronously through chain transmission. The regulating sprocket 9 drives the outer gear ring 8 through a short acceleration and deceleration process through a flat key transmission. At this time, the planetary carrier shaft 4 does not rotate, the sun gear 7 rotates a certain angle, and the sun gear 7 drives the fertilizer sprocket 1 to rotate synchronously. The fertilizer driven sprocket 15 and the fertilizer disk are connected with the seed disk through a flat key, so that the fertilizer disk rotates more or less than a certain angle relative to the seed disk, so that the seed and fertilizer positions correspond to each other, and the regulating motor 14 is locked. The process of corresponding seed and fertilizer is repeated, and the seed disk and the fertilizer disk continue to work with a fixed transmission ratio.

[0037] The preferred embodiments of the present invention are listed below in conjunction with the accompanying drawings to further describe the present invention in detail.

[0038] like Figure 1 As shown, an automatic seed-to-seed regulating device for hole-fertilizing based on a planetary gear train comprises a fertilizer discharge sprocket 1, a bearing seat assembly 3, a planetary gear train, a seed discharge sprocket 5, a regulating sprocket 9, a frame 10, a bearing 11, a flat key assembly, a regulating driving sprocket 13 and a regulating motor 14, wherein the central axes of the planetary gear train, the seed discharge sprocket 5, the fertilizer discharge sprocket 1 and the regulating sprocket 9 are in a straight line; the regulating driving sprocket 13 and the regulating motor 14 are located on one side of the planetary gear train, the seed discharge sprocket 5, the fertilizer discharge sprocket 1 and the regulating sprocket 9; the bearing seat assembly 3 is a fixed supporting component, which is designed with bolt holes for connecting the regulating device to the frame 10, and is designed with bearing openings for supporting and transmitting the drive shaft and the rotating shaft; the planetary gear train comprises a sun gear shaft 2, a planetary frame shaft 4, a planetary gear shaft 6, a sun gear 7 and an outer gear ring 8.

[0039] like Figure 2 As shown, the flat key assembly includes flat key A1201, flat key B1202, flat key C1203 and flat key D1204, wherein the regulating sprocket 9 is connected with the flat key A1201 for synchronous rotation, the sun gear shaft 2 is connected with the flat key B1202 for rotation, the planetary carrier shaft 4 is connected with the flat key C1203 for rotation, and the fertilizer discharge sprocket 1 is connected with the flat key D1204 for rotation.

[0040] like Figure 3 As shown, the bearing seat assembly 3 includes a bearing seat A301, a bearing seat B302, a bearing seat C303 and a bearing seat D304. The center axes of the holes of the bearing seats A301, B302, C303 and D304 are collinearly distributed. The bearing seats A301 and B302 are adjacent, and the bearing seats C303 and D304 are adjacent. The sun gear shaft 2 is supported by the bearing holes of the bearing seats A301, B302 and D304, and the shaft of the outer gear ring 8 is supported by the bearing hole of the bearing seat C303 to ensure that power is transmitted in the axial direction.

[0041] like Figure 4 As shown, the fertilizer discharge driven sprocket 15 rotates synchronously with the fertilizer discharge sprocket 1 through chain transmission, and the seed discharge active sprocket 16 rotates synchronously with the seed discharge sprocket 5 through chain transmission. During operation, the tractor pulls the single implement forward, and the ground wheel drives the seeding disc to rotate. The seeding disc cooperates with the seeding sprocket 5 through the shaft key for transmission. When it is detected that the seed and fertilizer positions correspond to each other, the shaft of the outer gear ring 8 is locked and does not work. The seeding sprocket 5 drives the seeding shaft to rotate the planetary carrier shaft 4, and the planetary gear is externally meshed with the sun gear 7, and the sun gear 7 rotates drivenly. At this time, the outer gear ring 8 is stationary, and the sun gear 7 rotates synchronously with the sun gear shaft 2 to synchronously transmit the rotation phase to the fertilizer sprocket 1. The fertilizer sprocket 1 and the fertilizer driven sprocket 15 are linked by chain transmission, and the fertilizer driven sprocket 15 transmits the rotation phase to the fertilizer disc, so that the seed spacing and fertilizer spacing are equal and synchronous and ensure that the relative positions of the seed and fertilizer correspond to each other; when it is detected that the seed and fertilizer positions are deviated, the control motor 14 rotates to drive the control active sprocket 13 to rotate, and the control active sprocket 13 and the control sprocket 9 Through the synchronous rotation of chain drive, the regulating sprocket 9 drives the outer ring gear 8 through a short acceleration and deceleration process, the outer ring gear 9 is meshed with the planetary gear, the planetary carrier shaft 4 does not rotate, and the sun gear 7 rotates a certain angle, and the sun gear 7 drives the fertilizer sprocket 1 to rotate synchronously, and the fertilizer driven sprocket 15 and the fertilizer disc are connected with the seed disc through a flat key, so that the fertilizer disc rotates more (or less) than the seed disc by a certain angle, that is, the fertilizer moves forward (or backward) a certain distance relative to the seed. When the positions of the seed and fertilizer are realigned, the regulating motor 14 is locked, and the process of the seed and fertilizer corresponding to each other is repeated. The seed disc and the fertilizer disc continue to work at a fixed transmission ratio. When a deviation in the seed and fertilizer position is detected, the regulating motor 14 has an extremely short adjustment time, the ground wheel hardly moves forward, and the seed sprocket 5 does not rotate, so as to avoid excessive adjustment angle error.

[0042] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic seed control device for hole fertilization based on a planetary gear system, characterized in that: The invention comprises a planetary gear train, a fertilizer discharge sprocket (1), a bearing seat assembly, a seed discharge sprocket (5), a regulating motor (14), a fertilizer discharge driven sprocket (15) and a seed discharge driving sprocket (16); the fertilizer discharge driven sprocket (15) and the fertilizer discharge sprocket (1) rotate synchronously through a chain drive, and the seed discharge driving sprocket (16) and the seed discharge sprocket (5) rotate synchronously through a chain drive; the seed discharge sprocket (5) and the fertilizer discharge sprocket (1) ensure a fixed transmission ratio through the planetary gear train, and ensure that the seed spacing and fertilizer spacing are equal; when a deviation between the seed and fertilizer positions is detected, the regulating motor (14) drives the fertilizer discharge sprocket (1) to deflect by a certain angle relative to the seed discharge sprocket (5), that is, the fertilizer is offset by a certain distance relative to the seed, so that the seed and fertilizer positions correspond to each other again; at this time, the regulating motor (14) is locked, while the seed discharge sprocket (5) and the fertilizer discharge sprocket (1) continue to work at a fixed transmission ratio.

2. The automatic seeding control device for hole fertilization based on a planetary gear system according to claim 1 is characterized in that: Furthermore, the planetary gear train comprises a sun gear shaft (2), a planet carrier shaft (4), a planet gear shaft (6), a sun gear (7), an outer gear ring (8) and planetary gears, the planetary gears are all meshed with the sun gear (7) externally, the planetary gears are all meshed with the outer gear ring (8) internally, the planetary gears are all axially fixed to the planet carrier shaft (4) via an axial ring, the planetary gears form a rotating pair with the planet carrier shaft (4), the sun gear (7) is connected to the sun gear shaft (2) via a flat key, and the shaft of the outer gear ring (8) is connected to the regulating sprocket (9) via a flat key.

3. The automatic seed control device for hole fertilization based on a planetary gear system according to claim 2 is characterized in that: The seeding sprocket (5) is connected to the planetary frame shaft (4) via a flat key, the seeding sprocket (5) is connected to the planetary wheel shaft (6) via the planetary frame shaft (4), and the fertilizer discharge sprocket (1) is connected to the sun wheel shaft (2) via a flat key.

4. The automatic seed control device for hole fertilization based on a planetary gear system according to claim 2 is characterized in that: The central axes of the planetary gear train, the seeding sprocket (5), the fertilizer discharging sprocket (1) and the regulating sprocket (9) are in a straight line.

5. The automatic seeding control device for hole fertilization based on a planetary gear system according to claim 2 is characterized in that: The sun gear shaft (2) and the planet carrier shaft (4) are axially fixed via bearings and bearing seat assemblies, respectively, thereby forming a stable support and transverse structure, ensuring smooth and reliable operation of the seeding drive.

6. The automatic seeding control device for hole fertilization based on a planetary gear system according to claim 2 is characterized in that: The regulating motor (14) is located on one side of the planetary gear train, the seeding sprocket (5), the fertilizer discharging sprocket (1) and the regulating sprocket (9); the regulating motor (14) and the regulating driving sprocket (13) are matched via a flat key to achieve synchronization of the output speed of the regulating motor (14) and the rotation phase of the regulating sprocket (9).

7. The automatic seeding control device for hole fertilization based on a planetary gear system according to claim 6 is characterized in that: The regulating driving sprocket (13) and the regulating sprocket (9) are located in the same longitudinal plane and transmit power through chain drive.

8. The automatic seeding control device for hole fertilization based on a planetary gear system according to claim 6 is characterized in that: When it is detected that the seed and fertilizer positions correspond to each other, the shaft of the outer gear ring (8) is locked, and under the drive of the seed sprocket (5), the planetary carrier shaft (4) rotates, the sun gear (7) rotates drivenly, the sun gear (7) and the sun gear shaft (2) rotate synchronously to synchronously transmit the rotation phase to the fertilizer sprocket (1), and the fertilizer driven sprocket (15) transmits the rotation phase to the fertilizer plate through the flat key matching transmission, so that the seed spacing and fertilizer spacing are equal and synchronous and ensure that the relative positions of the seed and fertilizer correspond to each other; When a deviation in the position of the seed and fertilizer is detected, the control motor (14) drives the control driving sprocket (13) to rotate, and the control driving sprocket (13) and the control sprocket (9) rotate synchronously through chain transmission. The control sprocket (9) drives the outer gear ring (8) through a flat key transmission to undergo a short period of acceleration and deceleration. At this time, the planetary carrier shaft (4) does not rotate, the sun gear (7) rotates a certain angle, and the sun gear (7) drives the fertilizer discharge sprocket (1) to rotate synchronously. The fertilizer discharge driven sprocket (15) and the fertilizer discharge disc are connected with the seed discharge disc through a flat key, so that the fertilizer discharge disc rotates more or less than a certain angle relative to the seed discharge disc, so that the seed and fertilizer positions correspond to each other again, and the control motor (14) is locked, and the process of the seed and fertilizer corresponding to each other is repeated, and the seed discharge disc and the fertilizer discharge disc continue to maintain a fixed transmission ratio.

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