Seed metering device front drive mechanism, seeder and seed metering method

Abstract

The application relates to a seed-metering device front transmission mechanism, a seeding machine and a seed-metering method. The front transmission mechanism comprises a driving wheel part and a driven wheel part. The rotating shaft of the driving wheel part is associatedly matched to a driving unit, and the rotating shaft of the driven wheel part is associatedly matched to a seed-metering device. A first tooth surface is formed on the outer peripheral surface of the gear of the driving wheel part. N second tooth surfaces are formed on the outer peripheral surface of the gear of the driven wheel part, and a locking arc is formed between two adjacent second tooth surfaces, wherein N is a natural number greater than or equal to 3. After the gear on the driving wheel part is correspondingly matched with the gear on the driven wheel part, the first tooth surface can sequentially mesh with each second tooth surface, and the outer peripheral surface of the gear of the driving wheel part can sequentially match with the arc surface of each locking arc. The patent realizes a cycle process of seed-metering-discontinuous stopping-seed-metering, creates an intermittent seed-metering mode, and is not only helpful for increasing the plant density of crops, but also can guarantee the ventilation and light transmittance, and is helpful for increasing the yield.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a seed metering device front transmission mechanism that enables the seed metering device to achieve a new seed metering method, a seeder having the seed metering device front transmission mechanism, and the seed metering method thereof. Background Technology

[0002] To achieve high-yield and high-quality planting, crops or plants need to be sown or placed in suitable growing positions at regular intervals to ensure efficient and robust growth. Existing seeders use a seed metering device to separate seeds from the seed box and distribute them (single or multiple seeds) into the seed furrow at adjustable intervals, achieving spaced planting.

[0003] Existing seed metering devices can be divided into two main categories based on their seed metering principle: one is the mechanical (precision) seed metering device, which separates seeds from the seed box according to seed shape using the metering orifice. The filling, cleaning, and unloading processes are completed by the seed's own weight or mechanical devices. The other is the pneumatic (precision) seed metering device, which typically uses a tractor's power output to drive a blower, generating vacuum suction or air pressure to cause seeds to adhere to the orifice by grain (single or multiple seeds). The filling and cleaning processes are completed by pneumatic force. Common examples of the former include the eye-wheel seed metering device and the ring-hole seed metering device, while examples of the latter include the air suction seed metering device, the air blowing seed metering device, and the pneumatic pressure seed metering device.

[0004] The basic operating procedures and principles of the five seed metering devices are briefly explained below:

[0005] The seed metering device uses a seed filling chamber where seeds are filled by their own weight into a rotating seed filling wheel. When the seed cleaning wheel rotates in the opposite direction, excess seeds are removed. The seeds then rotate with the seed filling wheel into the seed protection zone. When the seeds reach the unloading position below, the seed pushing plate pushes the seeds out of the seed hole and into the seed groove.

[0006] The ring-shaped seed metering device fills the seed chamber with seeds by their own weight into the ring-shaped seed metering tape holes that move in the opposite direction to the seeder's forward movement. The seeds are protected by an elastic seed-protecting plate, and excess seeds are scraped off by a rubber seed-cleaning wheel. When the device moves to the seed discharge port, the seeds fall into the seed furrow by their own weight.

[0007] The air-suction seed metering device features a seed-metering disc with suction holes that separates the suction chamber and the filling chamber. The back of the disc is a vacuum chamber connected to the air suction pipe of a blower, while the front is the filling chamber where the seeds come into contact. As the disc rotates, the negative pressure in the vacuum chamber draws the seeds onto the suction holes, causing them to rotate with the disc. When the disc reaches the seed scraping plate, excess seeds are scraped off. When the disc reaches the seed unloading position below the disc, the suction holes holding the seeds extend beyond the vacuum chamber, the suction disappears, and the seeds fall into the seed furrow by their own weight or a pusher.

[0008] This air-blowing seed metering device, based on the hole-wheel seed metering device, utilizes airflow for seed clearing, significantly improving seed metering quality. In the filling zone, seeds are filled into the seed metering wheel's orifice under the influence of gravity and airflow pressure difference. When the filling orifice rotates to the clearing zone, a high-pressure airflow supplied by a blower blows away excess seeds from the top of the orifice, leaving only one seed trapped inside. This seed then rotates with the seed metering wheel to the seed protection zone, where the air pressure disappears. Finally, in the lower unloading zone, the seed is discharged into the seed furrow by gravity and the action of the seed-pushing plates.

[0009] There are two main types of pneumatic seed metering devices: one is a centralized seed metering system, which can sow 6-8 rows of crops simultaneously; the other is a single seed metering device that can only sow one row of crops. In the former case, the seed metering device is an internally filled rotary seed metering cylinder with indentations on the inner wall. Small holes in the bottom of these indentations connect to the outside atmosphere. Airflow from the blower enters the seed metering cylinder through the inoculation funnel and then into the airflow seed delivery pipe. Because the seed metering cylinder is closed, the air pressure inside is higher than atmospheric pressure. The seeds, due to the pressure difference, adhere to the indentations and rise with the exhaust pipe. First, a seed cleaning brush removes excess seeds with smaller pressure differences. Then, an elastic seed unloading wheel blocks the small holes connecting the indentations to the atmosphere, eliminating the pressure difference. The seeds are then depressurized and fall into the inoculation funnels of each row under gravity, entering the airflow seed delivery pipe and being transported by the airflow to the seed furrows of each row. The latter removes the seed-discharging disc compared to the former, but the seed filling principle is the same as the former. The seeds are cleaned with a brush, and the seeds are unloaded by their own weight after the pressure is released from below, resulting in a very low seed damage rate.

[0010] In summary, all the seed metering devices mentioned above perform a sequential process of filling, clearing, and unloading seeds along with the rotation of the seed metering device. The seed metering process is a continuous and uniform process, resulting in relatively uniform plant spacing after sowing. However, there is a problem that the planting density can be too high or too low, making it difficult to control. That is, if the seed metering interval is set too short, the plant spacing after planting will be relatively small, which can easily lead to a high planting density. Conversely, if the seed metering interval is set too long, the plant spacing after planting will be relatively large, which can easily lead to a low planting density. This not only results in poor yield stability and significant dispersion, but also limited yield increase capacity. Summary of the Invention

[0011] This invention provides a pre-drive mechanism for a seed metering device, a seeder, and a seed metering method. The pre-drive mechanism enables the seed metering device to operate intermittently according to a certain pattern, achieving a cyclical process of continuous seeding-intermittent / stop-continuous seeding-intermittent / stop-continuous seeding… creating an intermittent seeding method. Compared to existing uniform seeding methods, this intermittent seeding method results in a plant structure that is both loose and compact after sowing. This not only helps increase crop plant density but also ensures ventilation and light penetration, greatly benefiting crop resistance and promoting grain fullness, thus contributing to further yield increases.

[0012] The technical solution adopted by this invention to solve its technical problem is: a seed metering device front transmission mechanism, including a driving wheel and a driven wheel. The rotating shaft of the driving wheel is associated with a drive unit, and the rotating shaft of the driven wheel is associated with the seed metering device.

[0013] A first tooth surface is formed on the outer circumferential surface of the driving gear. N second tooth surfaces are formed on the outer circumferential surface of the driven gear, and a locking arc is formed between two adjacent second tooth surfaces in a clockwise or counterclockwise direction, wherein N ≥ 3 and is a natural number.

[0014] After the gear on the driving wheel part is matched with the gear on the driven wheel part, the first tooth surface can mesh with the second tooth surface, and the outer peripheral surface of the gear on the driving wheel part can contact the locking arc.

[0015] The first tooth surface on the driving gear can sequentially mesh with the corresponding second tooth surfaces on the driven gear, and during this process, the outer circumferential surface of the driving gear can sequentially contact the locking arc located between two adjacent second tooth surfaces. This achieves the purpose of intermittently rotating the driven gear according to the changing pattern of rotation angle α – stop rotation time T – rotation angle α – stop rotation time T… as the driving gear rotates cyclically.

[0016] The contact matching between the outer peripheral surface of the driving gear and the locking arc prevents the driven gear from continuing to rotate (after the first tooth surface and the second tooth surface have ended their meshing relationship). This allows the first tooth surface to switch to a meshing relationship with the second tooth surface, which is located downstream of the locking arc in the rotation direction of the driven gear, when it rotates to the side of the driven gear that is closer to the driven gear.

[0017] After receiving power from the drive unit, the shaft of the driving wheel can drive the gear of the driving wheel to rotate. Through the meshing relationship established between the first tooth surface of the driving wheel gear and the second tooth surface of the driven wheel gear, rotational power can be transmitted to the driven wheel gear, causing it to rotate and transmit power to the seed metering device via the shaft, thus enabling the seed metering device to perform the seed metering action. As the driving wheel gear rotates, the meshing position between the first tooth surface and the currently meshing section of the second tooth surface reaches its end, entering the stage where the outer circumference of the driving wheel gear contacts and matches the locking arc. During this period, the driving wheel gear continues to rotate, while the driven wheel gear stops rotating and cannot transmit power to the seed metering device via the shaft; the seed metering device is in a state of stopped seed metering. After the driving gear completes one revolution, the first tooth surface of the driving gear meshes with the second tooth surface of the driven gear, driving the driven gear to rotate again and transmitting power to the seed metering device via the shaft, thus enabling the seed metering device to perform the seeding action. This cycle repeats continuously. Therefore, for the driven gear to rotate one revolution, the driving gear needs to rotate N revolutions.

[0018] This allows the outer diameter of the gear in the driving gear section to be the same as the outer diameter of the gear in the meshing driven gear section.

[0019] Optionally, the driving wheel's shaft and gear transmit power through a key and keyway connection. The driven wheel's shaft and gear also transmit power through a key and keyway connection.

[0020] Optionally, the shaft of the driving wheel is a prismatic shaft, and a prismatic through hole corresponding to the prismatic shaft is provided at the center of the gear of the driving wheel. The shaft of the driven wheel is a prismatic shaft, and a prismatic through hole corresponding to the prismatic shaft is provided at the center of the gear of the driven wheel. The prismatic shaft of the driving wheel and the gear are in an interference fit or a transition fit relationship. The prismatic shaft of the driven wheel and the gear are in an interference fit or a transition fit relationship.

[0021] Optionally, the outer circumferential surface of the driven gear has three, four, five, or six segments of second tooth surface. The length of the first tooth surface formed along the circumferential direction and / or the size of the central angle formed at both ends of the first tooth surface on the outer circumferential surface of the driving gear are adjusted accordingly based on the number of segments (three, four, five, or six) of the second tooth surface formed on the driven gear, so as to ensure that the driven gear rotates one revolution after the driving gear rotates three, four, five, or six revolutions.

[0022] Optionally, the driving wheel section includes a driving shaft and a driving wheel fixed on the driving shaft. The driven wheel section includes a driven shaft and a driven wheel fixed on the driven shaft.

[0023] The first tooth surface is provided on the outer peripheral surface of the driving wheel. N segments of the second tooth surface are formed on the outer peripheral surface of the driven wheel, and the locking arc is distributed between two consecutive adjacent segments of the second tooth surface on the outer peripheral surface of the driven wheel.

[0024] After the driving wheel and the driven wheel are matched accordingly, the first tooth surface can mesh with each of the second tooth surfaces in sequence, and the outer circumferential surface of the driving wheel can match the arc surface of each locking arc in sequence, so as to achieve the transmission purpose of the driving wheel rotating N times when the driven wheel rotates one revolution.

[0025] The active rotating shaft is associated with the drive unit, and the driven rotating shaft is associated with the seed metering device.

[0026] The outer diameter of the driving wheel can be made to be the same as that of the driven wheel, or the outer diameters of the two can be different but similar.

[0027] Optionally, the driving wheel section includes a first driving wheel and a second driving wheel fixed on the driving shaft. The first driving wheel and the second driving wheel are arranged alternately along the axial direction, and a first tooth surface a is formed on the outer peripheral surface of the first driving wheel, and a first tooth surface b is formed on the outer peripheral surface of the second driving wheel.

[0028] The driven wheel portion includes a bushing sleeved on the driven shaft, a locking portion disposed between the driven shaft and the bushing, and a first driven wheel and a second driven wheel fixed on the outer circumferential surface of the bushing. The first driven wheel and the second driven wheel are arranged alternately along the axial direction, and N1 segments of second tooth surfaces a are formed on the outer circumferential surface of the first driven wheel, and N2 segments of second tooth surfaces b are formed on the outer circumferential surface of the second driven wheel. Locking arcs are formed between two adjacent segments of second tooth surfaces a and between two adjacent segments of second tooth surfaces b, where N1>N2≥3 and N1 and N2 are both natural numbers.

[0029] The bushing can move axially relative to the driven shaft, selectively matching the first driving wheel with the first driven wheel and offsetting the second driving wheel with the second driven wheel, and matching the second driving wheel with the second driven wheel and offsetting the first driving wheel with the first driven wheel.

[0030] The locking part can selectively fix the bushing to the driven rotating shaft and release the fixing effect on the bushing.

[0031] When the locking part fixes the bushing relative to the driven shaft, the bushing is in a state where it cannot move axially relative to the driven shaft. At this time, it is either in a state where the first driving wheel and the first driven wheel are matched, or in a state where the second driving wheel and the second driven wheel are matched. When the locking part releases its fixing effect on the bushing, the bushing is in a state where it can move axially relative to the driven shaft. At this time, by adjusting the axial position of the bushing relative to the driven shaft, it is possible to switch between the state where the first driving wheel and the first driven wheel are matched and the state where the second driving wheel and the second driven wheel are matched.

[0032] It should be noted that: when the first driving wheel and the first driven wheel are in a corresponding matching state, as the first driving wheel rotates, the first tooth surface a can sequentially mesh with the second tooth surface a on the first driven wheel, and the outer circumferential surface of the first driving wheel can sequentially match the arc surface of the locking arc between two adjacent second tooth surfaces a. During this period, the second driving wheel and the second driven wheel cannot establish a meshing relationship. When the second driving wheel and the second driven wheel are in a corresponding matching state, as the second driving wheel rotates, the first tooth surface b can sequentially mesh with the second tooth surface b on the second driven wheel, and the outer circumferential surface of the second driving wheel can sequentially match the arc surface of the locking arc between two adjacent second tooth surfaces b. During this period, the first driving wheel and the first driven wheel cannot establish a meshing relationship.

[0033] Optionally, the locking part includes a screw and a nut.

[0034] An axially extending strip groove is formed on the side wall of the bushing, at a position between the first driven wheel and the second driven wheel.

[0035] A through hole with a radial orientation and a central axis is formed on the driven shaft. A countersunk hole for accommodating the nut is formed at one end of the through hole. The sleeve is fitted onto the driven shaft such that the other end of the through hole is opposite to the slot, and the screw rod can pass through the slot and the through hole to match the nut.

[0036] By turning the screw to adjust the matching length between the screw end and the nut, the tightness of the fixing structure between the bushing and the driven shaft can be adjusted, and the bushing can be switched between a state in which it is relatively fixed to the driven shaft and a state in which it can move axially relative to the driven shaft.

[0037] When the screw cap end of the screw is aligned with the two ends of the strip groove, it is respectively in a state where the first driving wheel can be matched with the first driven wheel and the second driving wheel can be matched with the second driven wheel, so as to facilitate the quick completion of the positioning and adjustment process.

[0038] Preferably, an annular flange is formed on the end face of the nut that forms a countersunk hole away from the end of the through hole. Tightening the screw allows the end of the screw body to extend into the annular flange, so that the end cap of the screw presses the bushing onto the driven shaft; conversely, as the screw body is moved out of the annular flange, the clamping force of the end cap of the screw on the bushing gradually decreases until it is eliminated, allowing the bushing to move axially relative to the driven shaft.

[0039] Optionally, the driving wheel section includes a first driving wheel, a second driving wheel, and a third driving wheel fixed on the driving shaft. The first driving wheel, the second driving wheel, and the third driving wheel are arranged alternately along the axial direction, and a first tooth surface a is formed on the outer peripheral surface of the first driving wheel, a first tooth surface b is formed on the outer peripheral surface of the second driving wheel, and a first tooth surface c is formed on the outer peripheral surface of the third driving wheel.

[0040] The driven wheel portion includes a bushing sleeved on the driven shaft, a locking portion disposed between the driven shaft and the bushing, and a first driven wheel, a second driven wheel, and a third driven wheel fixed to the outer circumferential surface of the bushing. The first driven wheel, the second driven wheel, and the third driven wheel are arranged alternately along the axial direction, and N1 segments of second tooth surfaces a are formed on the outer circumferential surface of the first driven wheel, N2 segments of second tooth surfaces b are formed on the outer circumferential surface of the second driven wheel, and N3 segments of second tooth surfaces c are formed on the outer circumferential surface of the third driven wheel. Locking arcs are formed between adjacent segments of second tooth surfaces a, between adjacent segments of second tooth surfaces b, and between adjacent segments of second tooth surfaces c, where N1>N2>N3≥3 and N1, N2, and N3 are all natural numbers.

[0041] The bushing can move axially relative to the driven shaft, selectively matching the first driving wheel with the first driven wheel, the second driving wheel with the second driven wheel, and the third driving wheel with the third driven wheel.

[0042] That is, when the first driving wheel and the first driven wheel are uniquely matched, the second driving wheel, the third driving wheel, the second driven wheel, and the third driven wheel cannot establish a meshing relationship with each other, and their axial positions are opposite; when the second driving wheel and the second driven wheel are uniquely matched, the first driving wheel, the third driving wheel, the first driven wheel, and the third driven wheel cannot establish a meshing relationship with each other, and their axial positions are opposite; when the third driving wheel and the third driven wheel are uniquely matched, the first driving wheel, the second driving wheel, the first driven wheel, and the second driven wheel cannot establish a meshing relationship with each other, and their axial positions are opposite.

[0043] The locking part can selectively fix the bushing to the driven rotating shaft and release the fixing effect on the bushing.

[0044] When the locking part fixes the bushing relative to the driven shaft, the bushing is in a state where it cannot move axially relative to the driven shaft. At this time, it is either in a state where the first driving wheel and the first driven wheel are uniquely matched, or in a state where the second driving wheel and the second driven wheel are uniquely matched, or in a state where the third driving wheel and the third driven wheel are uniquely matched. When the locking part releases its fixing effect on the bushing, the bushing is in a state where it can move axially relative to the driven shaft. At this time, by adjusting the axial position of the bushing relative to the driven shaft, it is possible to switch between the states where the first driving wheel and the first driven wheel are matched, the second driving wheel and the second driven wheel are matched, and the third driving wheel and the third driven wheel are matched.

[0045] It should be noted that: when the first driving wheel and the first driven wheel are in a corresponding matching state, as the first driving wheel rotates, the first tooth surface a can sequentially mesh with each of the second tooth surfaces a on the first driven wheel, and the outer circumferential surface of the first driving wheel can sequentially match the arc surface of the locking arc between two adjacent second tooth surfaces a. During this period, the second driving wheel, the third driving wheel, the second driven wheel, and the third driven wheel cannot establish a meshing relationship. When the second driving wheel and the second driven wheel are in a corresponding matching state, as the second driving wheel rotates, the first tooth surface b can sequentially mesh with each of the second tooth surfaces b on the second driven wheel, and the outer circumferential surface of the second driving wheel can sequentially match the arc surface of the locking arc between two adjacent second tooth surfaces b. During this period, the first driving wheel, the third driving wheel, the first driven wheel, and the third driven wheel cannot establish a meshing relationship. When the third driving wheel and the third driven wheel are in a corresponding matching state, as the third driving wheel rotates, the first tooth surface c can sequentially mesh with each of the second tooth surfaces c on the third driven wheel, and the outer circumferential surface of the third driving wheel can sequentially match the arc surface of the locking arc between two adjacent second tooth surfaces c. During this period, no meshing relationship can be established between the first driving wheel, the second driving wheel and the first driven wheel, or the second driven wheel.

[0046] Optionally, the locking part includes a plurality of bolts and a pair of stop strips, the stop strips having a trapezoidal cross-section.

[0047] On the side wall of the bushing located between two adjacent driven wheels, a pair of threaded through holes are provided at both radial ends passing through the axis. The bolts are matched with the threaded through holes.

[0048] A pair of axial grooves are provided on the outer circumferential surface of the driven shaft, and the cross-section of the axial grooves is trapezoidal. The stop strip can be inserted into the axial grooves, so that the outer inclined surfaces on both sides of the stop strip contact the inner inclined surfaces on both sides of the axial grooves.

[0049] The axial extension length of the axial groove can be greater than 1.5 times the length of the stop strip. For ease of assembly, the axial extension length of the axial groove can be greater than the axial length of the bushing.

[0050] At both ends of the stop strip, countersunk holes are formed on the end faces facing the inner circumferential surface of the bushing. Radial flanges are formed on the inner walls of the countersunk holes near the ports. An annular portion corresponding to and matching the countersunk holes is formed on the threaded end face of the bolt. Multiple straight grooves are formed on the sidewalls of the annular portion, distributed alternately around the circumference, and locking protrusions corresponding to and matching the radial flanges on the countersunk holes are formed on the outer circumferential surface of the annular portion.

[0051] During the process of screwing the bolt into the threaded through hole on the bushing, the radial flange on the countersunk portion can push against the side wall of the retaining protrusion to compress the side wall of the ring portion into elastic deformation, causing the retaining protrusion to insert into the cavity of the countersunk portion. The outer diameter of the upper part of the retaining protrusion is larger than the inner diameter of the radial flange, so that the radial flange can prevent the retaining protrusion from moving outward from the cavity of the countersunk portion.

[0052] Adjusting the length of the bolt screwed into the threaded through hole can adjust the tightness between the stop strip and the axial groove mating surface, that is, it can adjust the tightness of the connection structure between the bushing and the driven shaft.

[0053] Optionally, a pair of alternately arranged elastic deformable arms are formed on the stop strip, with two countersunk holes corresponding to the outer sides of the two elastic deformable arms respectively. When the bolt is tightened so that the end of the bolt presses the stop strip against the axial groove, the elastic deformable arms can gradually bend elastically toward the axial groove.

[0054] A seeder comprising the aforementioned seed metering front drive mechanism.

[0055] A seeding method in which the seed metering device operates and stops intermittently according to a certain pattern during the movement, and the seeding is carried out in a cyclical manner along the direction of movement, with a certain length of seeding at intervals.

[0056] The beneficial effects of this invention are as follows: the provided seed metering device front-drive mechanism, seeder, and seed metering method enable the seed metering device to operate intermittently according to a certain pattern, achieving a cyclical process of continuous seeding-intermittent stopping-continuous seeding, thus creating an intermittent seeding method. Compared with the existing uniform seeding method, this intermittent seeding method results in a plant structure that is both loose and compact after sowing. This not only helps increase crop plant density but also ensures ventilation and light penetration, which is highly beneficial for improving crop resistance and promoting grain fullness, thus contributing to a further increase in yield.

[0057] When the seed metering device front drive mechanism, seeder, and seed metering method involved are used in the corn planting process, they help to create new corn planting methods and improve ventilation and light transmission. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the assembly structure of the front transmission mechanism relative to the seed metering device in this patent.

[0059] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the front-drive transmission mechanism.

[0060] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the front-drive transmission mechanism.

[0061] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the front-drive transmission mechanism (state switching process).

[0062] Figure 5 This is a schematic diagram of the structure of Embodiment 4 of the front-drive transmission mechanism.

[0063] Figure 6 This is a cross-sectional structural diagram of the corresponding matching locking part on the bushing in Embodiment 4.

[0064] Figure 7 This is a schematic diagram of the structure of Embodiment 5 of the front-drive transmission mechanism.

[0065] Figure 8 This is a cross-sectional structural diagram of the corresponding matching locking part on the bushing in Embodiment 5.

[0066] Figure 9 This is a schematic diagram of a specific implementation of the stop bar in Example 5.

[0067] Figure 10 A schematic diagram showing the distribution of grown crops after intermittent seeding by the seed metering device that matches the front transmission mechanism.

[0068] In the diagram: 100 drive unit, 200 seed meterer, 300 seed box, 400 front transmission mechanism;

[0069] 10. Drive wheel section, 10a. First drive wheel, 10b. Second drive wheel, 10c. Third drive wheel, 11. First tooth surface, 12. Drive shaft;

[0070] 20 Driven wheel section, 20a First driven wheel, 20b Second driven wheel, 20c Third driven wheel, 21 Second tooth surface, 22 Locking arc, 23 Driven shaft, 24 Through hole, 25 Axial groove;

[0071] 30 bushing, 31 slotted groove;

[0072] 40 Locking part, 41 Screw, 42 Nut, 43 Bolt, 431 Ring part, 432 Snap protrusion, 433 Straight groove, 44 Stopping strip, 441 Countersunk part, 442 Elastic deformation arm, 443 Radial flange;

[0073] L1 is the sowing section, and L2 is the discontinuous section. Detailed Implementation

[0074] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0075] like Figure 1 The diagram illustrates a pre-drive mechanism 400 for a seed metering device. This pre-drive mechanism includes a driving wheel 10 and a driven wheel 20. The shaft of the driving wheel 10 is associated with a drive unit 100, and the shaft of the driven wheel 20 is associated with a seed metering device 200. A seed box 300 is associated with the seed metering device 200, enabling the seed metering device 200 to retrieve seeds from the seed box 300.

[0076] Example 1

[0077] like Figure 2 As shown, a first tooth surface 11 is formed on the outer peripheral surface of the gear of the driving gear 10. Three second tooth surfaces 21 are formed on the outer peripheral surface of the gear of the driven gear 20, and a locking arc 22 is formed between two adjacent second tooth surfaces 21 in a clockwise or counterclockwise direction.

[0078] After the gear on the driving wheel 10 is matched with the gear on the driven wheel 20, the first tooth surface 11 can mesh with the second tooth surface 21, and the outer peripheral surface of the gear on the driving wheel 10 can contact the locking arc 22.

[0079] The first tooth surface 11 on the driving gear 10 can sequentially mesh with the three second tooth surfaces 21 on the driven gear 20 one by one. During this process, the outer circumferential surface of the driving gear 10 can sequentially contact the locking arc 22 located between two adjacent second tooth surfaces 21. In this way, the driving gear 10 is driven to rotate intermittently according to the changing pattern of rotation angle α-stop rotation time T-rotation angle α-stop rotation time T…

[0080] The outer peripheral surface of the driving gear 10 contacts and matches the arc surface of the locking arc 22, which prevents the driven gear 20 from continuing to rotate (after the first tooth surface 11 and the second tooth surface 21 have ended their meshing relationship). This allows the first tooth surface 11 to rotate to the side of the driven gear 20 and switch to a meshing relationship with the second tooth surface 21, which is downstream of the locking arc 22 in the rotation direction of the driven gear 20.

[0081] After the drive wheel 10 receives power from the drive unit 100, its shaft drives the gear of the drive wheel 10 to rotate. Through the meshing relationship established between the first tooth surface 11 on the drive wheel 10 gear and the second tooth surface 21 on the driven wheel 20 gear, rotational power is transmitted to the driven wheel 20 gear, causing it to rotate and transmit power to the seed metering device 200 via the shaft, thus enabling the seed metering device 200 to perform seed metering. As the drive wheel 10 gear rotates, the meshing position between the first tooth surface 11 and the currently meshing section of the second tooth surface 21 reaches its end, entering the stage where the outer circumferential surface of the drive wheel 10 gear contacts and matches the locking arc 22. During this period, the drive wheel 10 gear continues to rotate, while the driven wheel 20 gear stops rotating and cannot transmit power to the seed metering device 200 via the shaft, leaving the seed metering device 200 in a stopped seed metering state. After the gear of the driving wheel 10 completes one revolution, the first tooth surface 11 on the driving wheel 10 gear engages with the second tooth surface 21 on the driven wheel 20 gear, driving the driven wheel 20 gear to rotate again and transmitting power to the seed metering device 200 via a shaft, causing the seed metering device 200 to perform the seed metering action. This cycle repeats continuously. Therefore, for the driven wheel 20 gear to rotate one revolution, the driving wheel 10 gear needs to rotate three revolutions.

[0082] This allows the outer diameter of the gear in the driving wheel section 10 to be the same as the outer diameter of the gear in the meshing driven wheel section 20.

[0083] In this embodiment, the shaft of the driving wheel 10 and the gear transmit power through a key and keyway matching method. The shaft of the driven wheel 20 and the gear also transmit power through a key and keyway matching method.

[0084] Example 2

[0085] like Figure 3 As shown, the main difference between this embodiment and the previous embodiment lies in the form of the rotating shaft.

[0086] The drive wheel 10 has a prismatic shaft as its rotating shaft, and a prismatic through hole corresponding to the prismatic shaft is provided at the center of the gear in the drive wheel 10. The driven wheel 20 has a prismatic shaft as its rotating shaft, and a prismatic through hole corresponding to the prismatic shaft is provided at the center of the gear in the driven wheel 20. The prismatic shaft of the drive wheel 10 and the gear are in an interference fit or a transition fit relationship. The prismatic shaft of the driven wheel 20 and the gear are in an interference fit or a transition fit relationship.

[0087] In other facility solutions, the outer circumferential surface of the driven gear 20 may also have four, five, or six segments of second tooth surface 21. In this case, the length of the first tooth surface 11 formed on the outer circumferential surface of the driving gear 10 along the circumferential direction and / or the size of the central angle formed at both ends of the first tooth surface 11 are adjusted according to the number of segments of the four, five, or six segments of second tooth surface 21 formed on the driven gear 20, so as to ensure that the driven gear 20 rotates one revolution after the driving gear 10 rotates four, five, or six revolutions.

[0088] like Figures 1 to 3 As shown, the driving wheel section 10 includes a driving shaft 12 and a driving wheel (driving gear) fixed on the driving shaft 12. The driven wheel section 20 includes a driven shaft 23 and a driven wheel (driven gear) fixed on the driven shaft 23. The first tooth surface 11 is provided on the outer circumferential surface of the driving wheel. Three segments of the second tooth surface 21 are formed on the outer circumferential surface of the driven wheel, and the locking arcs 22 are distributed between two adjacent segments of the second tooth surface 21 on the outer circumferential surface of the driven wheel. After the driving wheel and the driven wheel are matched accordingly, the first tooth surface 11 can mesh sequentially with each of the second tooth surfaces 21, and the outer circumferential surface of the driving wheel can sequentially match the arc surfaces of each of the locking arcs 22, thereby achieving the transmission purpose of the driving wheel rotating three times when the driven wheel rotates one revolution.

[0089] The driving shaft is associated with the drive unit, and the driven shaft is associated with the seed metering device. The outer diameter of the driving wheel can be the same as that of the driven wheel, or they can be different but similar in size.

[0090] Example 3

[0091] Given that the above embodiments only enable the seed metering device 200 to achieve one intermittent operation mode, this embodiment is designed to enable the seed metering device 200 to switch between two intermittent operation modes.

[0092] The drive wheel section 10 includes a first drive wheel 10a and a second drive wheel 10b fixed on the drive shaft 12. The first drive wheel 10a and the second drive wheel 10b are arranged alternately along the axial direction, and a first tooth surface a (not shown) is formed on the outer peripheral surface of the first drive wheel 10a, and a first tooth surface b (not shown) is formed on the outer peripheral surface of the second drive wheel 10b.

[0093] The driven wheel portion 20 includes a bushing 30 sleeved on the driven shaft 23, a locking portion 40 disposed between the driven shaft 23 and the bushing 30, and a first driven wheel 20a and a second driven wheel 20b fixed to the outer circumferential surface of the bushing 30. The first driven wheel 20a and the second driven wheel 20b are arranged alternately along the axial direction, and an N1 segment of second tooth surface a (not shown) is formed on the outer circumferential surface of the first driven wheel 20a, and an N2 segment of second tooth surface b (not shown) is formed on the outer circumferential surface of the second driven wheel 20b. Locking arcs (not shown) are formed between adjacent segments of second tooth surface a and between adjacent segments of second tooth surface b. N1 can be set to 4, and N2 can be set to 3.

[0094] The outer diameters of the gears of the first driving gear 10a, the second driving gear 10b, the first driven gear 20a, and the second driven gear 20b can be the same, or the outer diameters of the first driving gear 10a and the second driving gear 10b can be the same, and the outer diameters of the first driven gear 20a and the second driven gear 20b can be the same.

[0095] The bushing 30 can move axially relative to the driven shaft 23 and can selectively switch between the following two states.

[0096] State 1: The first driving wheel 10a is matched with the first driven wheel 20a, and the second driving wheel 10b and the second driven wheel 20b are misaligned, as shown in the figure. Figure 4 Left side view;

[0097] State 2: The second driving wheel 10b and the second driven wheel 20b are matched accordingly, and at this time the positions of the first driving wheel 10a and the first driven wheel 20a are offset, as shown in the figure. Figure 4 Right-side view.

[0098] The locking part 40 can selectively fix the bushing 30 to the driven rotating shaft 23 and release the fixing effect on the bushing 30.

[0099] When the locking part 40 fixes the bushing 30 relative to the driven shaft 23, the bushing 30 is in a state where it cannot move axially relative to the driven shaft 23. At this time, it is either in a state where the first driving wheel 10a and the first driven wheel 20a are matched, or in a state where the second driving wheel 10b and the second driven wheel 20b are matched. When the locking part 40 releases its fixing effect on the bushing 30, the bushing 30 is in a state where it can move axially relative to the driven shaft 23. At this time, by adjusting the axial position of the bushing 30 relative to the driven shaft 23, the switching between the state where the first driving wheel 10a and the first driven wheel 20a are matched and the state where the second driving wheel 10b and the second driven wheel 20b are matched can be realized.

[0100] It should be noted that: (1) When the first driving wheel 10a and the first driven wheel 20a are in a corresponding matching state, as the first driving wheel 10a rotates, the first tooth surface a can sequentially mesh with each of the second tooth surfaces a on the first driven wheel 20a, and the outer peripheral surface of the first driving wheel 10a can sequentially match with the arc surface of the locking arc between two adjacent second tooth surfaces a. During this period, the second driving wheel 10b and the second driven wheel 20b cannot establish a meshing relationship. (2) When the second driving wheel 10b and the second driven wheel 20b are in a corresponding matching state, as the second driving wheel 10b rotates, the first tooth surface b can sequentially mesh with each of the second tooth surfaces b on the second driven wheel 20b, and the outer peripheral surface of the second driving wheel 10b can sequentially match with the arc surface of the locking arc between two adjacent second tooth surfaces b. During this period, the first driving wheel 10a and the first driven wheel 20a cannot establish a meshing relationship.

[0101] In this embodiment, the locking part 40 includes a bolt and a threaded through hole on the sleeve 30. After the bolt is screwed into the threaded through hole, by controlling the position of the bolt's screw end face pressing against the outer circumferential surface of the driven shaft 23, the state of fixing the sleeve 30 and the driven shaft 23 into a whole can be switched, and the state of allowing the sleeve 30 to move axially relative to the driven shaft 23 can be switched. Multiple threaded through holes can be arranged alternately around the circumference of the sleeve 30, and each threaded through hole can be matched with a bolt.

[0102] Example 4

[0103] Compared to the previous embodiment, the main difference in this embodiment is that the composition and associated structure of the locking part 40 are designed separately.

[0104] like Figure 5 , Figure 6As shown, the locking part 40 includes a screw 41 and a nut 42. An axially extending slot 31 is formed on the side wall of the bushing 30, located between the first driven wheel 20a and the second driven wheel 20b. A through hole 24, passing through the axis and radially extending, is formed on the driven shaft 23 (prism shaft), and a countersunk hole capable of accommodating the nut 42 is formed at one end of the through hole 24.

[0105] The sleeve 30 is fitted onto the driven shaft 23, so that the other end of the through hole 24 is opposite to the strip groove 31, and the rod of the screw 41 can pass through the strip groove 31 and the through hole 24 and then match the nut 42.

[0106] By turning the screw 41 to adjust the matching length between the screw end and the nut 42, the tightness of the fixing structure between the bushing 30 and the driven rotating shaft 23 can be adjusted, and the bushing 30 can be switched between a state in which it is relatively fixed on the driven rotating shaft 23 and a state in which it can move axially relative to the driven rotating shaft 23.

[0107] When the screw 41's cap end is aligned with the two ends of the strip groove 31, it is respectively in a state where the first driving wheel 10a can be matched with the first driven wheel 20a and the second driving wheel 10b can be matched with the second driven wheel 20b, so as to facilitate the quick completion of the positioning and adjustment process.

[0108] An annular flange is formed on the end face of the nut 42 facing the inner circumferential surface of the bushing 30. Tightening the screw 41 allows the end of the screw to extend into the annular flange, thereby pressing the bushing 30 onto the driven shaft 23. Conversely, tightening the screw 41 allows the end of the screw to move out of the annular flange, and the clamping force exerted by the end of the screw 41 on the bushing 30 gradually decreases until it is eliminated, allowing the bushing 30 to move relative to the driven shaft 23 (along the axial direction).

[0109] Example 5

[0110] This embodiment is designed to enable the seed metering device 200 to switch between three intermittent operation modes.

[0111] like Figures 7 to 9As shown, the drive wheel section 10 includes a first drive wheel 10a, a second drive wheel 10b, and a third drive wheel 10c fixed on the drive shaft 12. The first drive wheel 10a, the second drive wheel 10b, and the third drive wheel 10c are arranged alternately along the axial direction. A first tooth surface a (not shown) is formed on the outer peripheral surface of the first drive wheel 10a, a first tooth surface b (not shown) is formed on the outer peripheral surface of the second drive wheel 10b, and a first tooth surface c (not shown) is formed on the outer peripheral surface of the third drive wheel 10c. In the figure, the first drive wheel 10a is in the center position, and the second drive wheel 10b and the third drive wheel 10c are located to the left and right of the first drive wheel 10a, respectively.

[0112] The driven wheel portion 20 includes a bushing 30 sleeved on the driven shaft 23, a locking portion 40 disposed between the driven shaft 23 and the bushing 30, and a first driven wheel 20a, a second driven wheel 20b, and a third driven wheel 20c fixed to the outer circumferential surface of the bushing 30. The first driven wheel 20a, the second driven wheel 20b, and the third driven wheel 20c are arranged alternately along the axial direction. An N1 segment of a second tooth surface a (not shown) is formed on the outer circumferential surface of the first driven wheel 20a, an N2 segment of a second tooth surface b (not shown) is formed on the outer circumferential surface of the second driven wheel 20b, and an N3 segment of a second tooth surface c (not shown) is formed on the outer circumferential surface of the third driven wheel 20c. Locking arcs are formed between adjacent segments of second tooth surface a, adjacent segments of second tooth surface b, and adjacent segments of second tooth surface c. N1 can be set to 5, N2 to 4, and N3 to 3.

[0113] The bushing 30 can move axially relative to the driven shaft 23, selectively matching the first driving wheel 10a with the first driven wheel 20a (see example). Figure 7 As shown in the diagram, the second driving wheel 10b and the second driven wheel 20b are uniquely matched, and the third driving wheel 10c and the third driven wheel 20c are uniquely matched. In the diagram, the first driven wheel 20a is in the center position, and the second driven wheel 20b and the third driven wheel 20c are located to the left and right of the first driven wheel 20a, respectively, which corresponds to the positions of the driving wheels (in the previous paragraph).

[0114] When the first driving wheel 10a and the first driven wheel 20a are uniquely matched, the second driving wheel 10b, the third driving wheel 10c and the second driven wheel 20b and the third driven wheel 20c cannot establish a meshing relationship with each other, and their axial positions are opposite. When the second driving wheel 10b and the second driven wheel 20b are uniquely matched, the first driving wheel 10a, the third driving wheel 10c and the first driven wheel 20a and the third driven wheel 20c cannot establish a meshing relationship with each other, and their axial positions are opposite. When the third driving wheel 10c and the third driven wheel 20c are uniquely matched, the first driving wheel 10a, the second driving wheel 10b and the first driven wheel 20a and the second driven wheel 20b cannot establish a meshing relationship with each other, and their axial positions are opposite.

[0115] Depend on Figure 7 In the indicated state, the bushing 30 slides to the left or right relative to the driven shaft 23, which can switch between the unique matching state of the third driving wheel 10c and the third driven wheel 20c and the unique matching state of the second driving wheel 10b and the second driven wheel 20b, respectively. To prevent interference between the first driven wheel 20a and the second and third driving wheels 10b and 10c after moving to the left and right, the axial distance between the first driving wheel 10a and the second and third driving wheels 10b and 10c can be increased. Alternatively, the outer diameters of the second and third driving wheels 10b and 10c can be made smaller than the outer diameter of the first driving wheel 10a (in the figure, the outer diameters of the first driving wheel 10a and the first driven wheel 20a are the same, the outer diameters of the second driving wheel 10b and the second driven wheel 20b are the same, and the outer diameters of the third driving wheel 10c and the third driven wheel 20c are the same).

[0116] The locking part 40 can selectively fix the bushing 30 to the driven rotating shaft 23 and release the fixing effect on the bushing 30.

[0117] When the locking part 40 fixes the bushing 30 relative to the driven shaft 23, the bushing 30 is in a state where it cannot move axially relative to the driven shaft 23. At this time, it is either in a state where the first driving wheel 10a and the first driven wheel 20a are uniquely matched, or in a state where the second driving wheel 10b and the second driven wheel 20b are uniquely matched, or in a state where the third driving wheel 10c and the third driven wheel 20c are uniquely matched. When the locking part 40 releases its fixing effect on the bushing 30, the bushing 30 is in a state where it can move axially relative to the driven shaft 23. At this time, by adjusting the axial position of the bushing 30 relative to the driven shaft 23, it is possible to switch between the states where the first driving wheel 10a and the first driven wheel 20a are matched, the states where the second driving wheel 10b and the second driven wheel 20b are matched, and the states where the third driving wheel 10c and the third driven wheel 20c are matched.

[0118] It should be noted that: when the first driving wheel 10a and the first driven wheel 20a are in a corresponding matching state, as the first driving wheel 10a rotates, the first tooth surface a can sequentially mesh with each of the second tooth surfaces a on the first driven wheel 20a, and the outer peripheral surface of the first driving wheel 10a can sequentially match the arc surface of the locking arc between two adjacent second tooth surfaces a. During this period, the second driving wheel 10b, the third driving wheel 10c, and the second driven wheel 20b and the third driven wheel 20c cannot establish a meshing relationship. When the second driving wheel 10b and the second driven wheel 20b are in a corresponding matching state, as the second driving wheel 10b rotates, the first tooth surface b can sequentially mesh with each of the second tooth surfaces b on the second driven wheel 20b, and the outer peripheral surface of the second driving wheel 10b can sequentially match the arc surface of the locking arc between two adjacent second tooth surfaces b. During this period, the first driving wheel 10a, the third driving wheel 10c, and the first driven wheel 20a, the third driven wheel 20c cannot establish a meshing relationship. When the third driving wheel 10c and the third driven wheel 20c are in a corresponding matching state, as the third driving wheel 10c rotates, the first tooth surface c can sequentially mesh with each of the second tooth surfaces c on the third driven wheel 20c, and the outer peripheral surface of the third driving wheel 10c can sequentially match the arc surface of the locking arc between two adjacent second tooth surfaces c. During this period, the first driving wheel 10a, the second driving wheel 10b, and the first driven wheel 20a, the second driven wheel 20b cannot establish a meshing relationship.

[0119] The locking part 40 includes multiple bolts 43 and a pair of stop strips 44, the stop strips 44 having a trapezoidal cross-section. On the side wall of the bushing 30 located between two adjacent driven wheels, a pair of threaded through holes are provided at both radial ends passing through the axis. The bolts 43 correspond to and are matched with the threaded through holes.

[0120] A pair of axial grooves 25 are provided on the outer peripheral surface of the driven shaft 23, and the cross-section of the axial grooves 25 is trapezoidal. The stop strip 44 can be inserted into the axial grooves 25, so that the outer inclined surfaces on both sides of the stop strip 44 contact the inner inclined surfaces on both sides of the axial groove 25.

[0121] The axial extension length of the axial groove 25 is greater than 1.5 times the length of the stop strip 44. For ease of assembly, the axial extension length of the axial groove 25 is greater than the axial length of the bushing 30. When the bushing 30 can move axially relative to the driven shaft 23, the stop strip 44 can slide along the axial groove 25 (axially).

[0122] At both ends of the stop strip 44, countersunk holes 441 are formed on the end faces facing the inner circumferential surface of the bushing 30. On the inner wall of the countersunk hole 441, a radial flange 443 (in annular shape) is formed near the port. An annular portion 431 corresponding to and matching the countersunk hole 441 is formed on the threaded end face of the bolt 43. Multiple straight grooves 433 are formed on the sidewall of the annular portion 431, arranged alternately around the circumference, and a locking protrusion 432 corresponding to and matching the radial flange 443 on the countersunk hole 441 is formed on the outer circumferential surface of the annular portion 431.

[0123] During the process of screwing the bolt 43 into the threaded through hole on the bushing 30, the radial flange 443 on the countersunk portion 441 can push the retaining protrusion 432 to compress the side wall of the ring portion 431, causing elastic deformation, so that the ends of the retaining protrusion 432 and the ring portion 431 are both inserted into the cavity of the countersunk portion 441. The outer diameter of the retaining protrusion 432 is larger than the inner diameter of the radial flange 443, so that the radial flange 443 can prevent the retaining protrusion 432 from moving outward from the cavity of the countersunk portion 441. By using the blocking effect of the radial flange 443 on the locking body 432, when the bolt 43 is tightened (moving outward relative to the threaded through hole on the bushing 30), the locking body 432 can pull the stop strip 44 tightly inserted in the axial groove 25 outward by using the lifting effect of the radial flange 443 on the radial flange 443, so that the stop strip 44 can slide along the axial groove 25.

[0124] The end face of the bolt 43 can contact the end face of the stop strip 44, and can transmit pushing force between the contact surfaces of the two, pushing the stop strip 44 into the axial groove 25 and forming a clamp between the mating surfaces of the two. At this time, the stop strip 44 is relatively fixed in the axial groove 25 and forms a fixed connection with the driven rotating shaft 23.

[0125] Adjusting the length of the bolt 43 screwed into the threaded through hole can adjust the tightness of the (pressing) between the stop strip 44 and the axial groove 25 mating surface, that is, it can adjust the tightness of the (connection) of the connection structure between the bushing 30 and the driven rotating shaft 23, so as to switch the bushing 30 to a state in which it can slide relative to the driven rotating shaft 23 and to a state in which it forms a fixed connection with the driven rotating shaft 23.

[0126] A pair of alternately arranged elastic deformable arms 442 are formed on the stop strip 44, and two countersunk portions 441 are respectively located on the outer sides of the two elastic deformable arms 442. When the bolt 43 is tightened so that the end of the bolt 43 presses the stop strip 44 into the axial groove 25, the elastic deformable arms 442 can gradually bend elastically toward the axial groove 25.

[0127] like Figure 10 The method illustrated involves intermittently operating and stopping the seed metering device according to a specific pattern during the sowing process. This method cyclically sows seeds along a specific length in the direction of travel, with intervals between each sowing section. Multiple seeds (such as three, four, or five seeds) are sown in a concentrated section (as shown in the sowing section L1) to form multiple plant units. No seeds are sown during the intervals (as shown in the discontinuity section L2), thus achieving a continuous sowing process of multiple corn seeds at intervals within the sowing row.

[0128] When this patented technology is applied to corn planting, by controlling the lateral spacing between adjacent planting rows and the staggered relationship between planting segments L1 and discontinuous short segments L2 between adjacent planting rows, it helps to form a planting pattern of double rows on large ridges, wide and narrow rows, multiple plants per unit, unequal spacing, and triangular arrangement. This helps to enhance the competitive growth advantage among corn plants, fully utilize the conversion of wind, light, water, air, fog, and heat energy, and effectively solves the problems of excessive planting, premature aging, and high rate of empty stalks caused by excessive planting and unreasonable dense planting in traditional equidistant planting methods. The resulting planting area has good ventilation and light penetration, and the marginal effect in the field is prominent, which helps to enhance the resistance of corn plants, making them drought-resistant, flood-resistant, wind-resistant, and lodging-resistant. It can also increase soil temperature, promote seedling survival, early maturity, and uniform ear size inside and out, resulting in full grains and excellent quality.

[0129] It should be noted that the first driving wheel 10a, the second driving wheel 10b, the third driving wheel 10c, and the driving wheel lamp mentioned in this patent are all incomplete gears, and the length of the tooth surface formed on the outer circumference and the size of the central angle that can be formed need to be compatible with the various "driven wheels" mentioned below. Correspondingly, the first driven wheel 20a, the second driven wheel 20b, the third driven wheel 20c, and the driven wheel mentioned in this patent are all incomplete gears, and each has multiple tooth surfaces formed on its outer circumference. The number of gear surfaces specifically designed on each "driven wheel" can not be completely consistent. For example, the number of gear surfaces formed on the first driven wheel 20a, the second driven wheel 20b, and the third driven wheel 20c can be different, such as 3, 4, and 5, or 3, 4, and 6, or 4, 5, and 6, etc.

[0130] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Many aspects of the present invention can be improved without departing from the overall concept. Those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A pre-drive mechanism for a seed metering device, characterized in that: The main drive part is connected with a driving unit, and the driven part is connected with a seed sowing device. The first gear part has a first tooth surface, and the second gear part has N second tooth surfaces, and a locking arc is formed between two adjacent second tooth surfaces. The first tooth surface can be sequentially engaged with each second tooth surface, and the first gear part can be sequentially matched with each locking arc. The first main drive wheel and the second main drive wheel are arranged axially and have a first tooth surface a and a first tooth surface b. The first driven wheel and the second driven wheel are arranged axially and have N1 second tooth surfaces a and N2 second tooth surfaces b. The shaft sleeve can be axially moved relative to the driven shaft to switch between the state that the first main drive wheel is matched with the first driven wheel and the second main drive wheel is misaligned with the second driven wheel and the state that the second main drive wheel is matched with the second driven wheel and the first main drive wheel is misaligned with the first driven wheel. The locking part can selectively fix the shaft sleeve on the driven shaft and release the fixation of the shaft sleeve. The second gear part has three, four, five or six second tooth surfaces. The locking part includes a screw rod and a nut. A strip-shaped slot is formed on the side wall of the shaft sleeve between the first driven wheel and the second driven wheel. A through hole is formed on the driven shaft and extends radially.

2. A seed metering device front transmission mechanism, characterized in that: The shaft sleeve is sleeved on the driven shaft, and the other end of the through hole is opposite to the strip-shaped slot. The rod of the screw rod can pass through the strip-shaped slot and the through hole and be matched with the nut. The screw rod is screwed to adjust the matching length of the end of the screw rod and the nut, so as to adjust the tightness of the connection structure between the shaft sleeve and the driven shaft. The main drive part is connected with a driving unit, and the driven part is connected with a seed sowing device. The gear outer circumferential surface of the driving wheel part is formed with a first tooth surface; the gear outer circumferential surface of the driven wheel part is formed with N second tooth surfaces, and a locking arc is formed between two adjacent second tooth surfaces in clockwise direction or in counterclockwise direction, N≥3 and is a natural number; After the gears on the driving wheel part and the gears on the driven wheel part are correspondingly matched, the first tooth surface can be sequentially engaged with each second tooth surface, and the gear outer circumferential surface of the driving wheel part can be sequentially matched with the arc surface of each locking arc; The driving wheel part comprises a first driving wheel, a second driving wheel and a third driving wheel fixed on the driving shaft; the first driving wheel, the second driving wheel and the third driving wheel are arranged axially and the first tooth surface a is formed on the outer circumferential surface of the first driving wheel, the first tooth surface b is formed on the outer circumferential surface of the second driving wheel, and the first tooth surface c is formed on the outer circumferential surface of the third driving wheel; The driven wheel part comprises a shaft sleeve, a locking part arranged between the driven shaft and the shaft sleeve, and a first driven wheel, a second driven wheel and a third driven wheel fixed on the outer circumferential surface of the shaft sleeve; the first driven wheel, the second driven wheel and the third driven wheel are arranged axially and N1 second tooth surfaces a are formed on the outer circumferential surface of the first driven wheel, N2 second tooth surfaces b are formed on the outer circumferential surface of the second driven wheel, and N3 second tooth surfaces c are formed on the outer circumferential surface of the third driven wheel; a locking arc is formed between two adjacent second tooth surfaces a, between two adjacent second tooth surfaces b and between two adjacent second tooth surfaces c, N1>N2>N3≥3 and N1, N2 and N3 are natural numbers; The shaft sleeve can move axially relative to the driven shaft, and selectively match the first driving wheel with the first driven wheel, the second driving wheel with the second driven wheel and the third driving wheel with the third driven wheel; The locking part can selectively fix the shaft sleeve on the driven shaft and release the fixation of the shaft sleeve; The locking part comprises a plurality of bolts and a pair of stop pressing strips, and the cross section of the stop pressing strip is trapezoidal; A pair of threaded holes are arranged on the side wall between two adjacent driven wheels on the shaft sleeve, and the threaded holes pass through the radial direction of the shaft center line; the bolts are correspondingly matched with the threaded holes; A pair of axial grooves are arranged on the outer circumferential surface of the driven shaft, and the cross section of the axial groove is trapezoidal; the stop pressing strip can be inserted into the axial groove, so that the two side outer inclined surfaces of the stop pressing strip can contact with the two side inner inclined surfaces of the axial groove; A counterbore part is formed on the end surface of the stop pressing strip, which faces the inner circumferential surface of the shaft sleeve; a radial flange is formed on the inner wall of the counterbore part, which is close to the port; An annular part is formed on the screw end surface of the bolt, which is correspondingly matched with the counterbore part; a plurality of straight grooves are arranged on the side wall of the annular part, which are distributed in the circumferential direction, and a clamping protruding body is formed on the outer circumferential surface of the annular part; The radial flange on the counterbore portion can push the clamping protrusion to compress the side wall of the ring body portion to elastically deform, so that the clamping protrusion is inserted into the hole cavity of the counterbore portion; the outer diameter of the clamping protrusion is greater than the inner diameter of the radial flange, so that the radial flange can prevent the clamping protrusion from moving out of the hole cavity of the counterbore portion; Adjusting the length of the bolt inserted into the threaded through hole can control the pressing force of the bolt acting on the stop pressing strip, so as to adjust the pressing tightness between the stop pressing strip and the combined surface of the axial groove; The gear outer peripheral surface of the driven wheel portion is formed with second tooth surfaces in three, four, five or six segments.

3. The pre-drill drive mechanism of claim 2, wherein: A pair of elastic deformation arms are arranged on the stop pressing strip, and two counterbores are arranged on the outer sides of the two elastic deformation arms, respectively. When the bolt is screwed and the end of the bolt presses the stop pressing strip towards the axial groove, the elastic deformation arms can gradually elastically bend towards the side of the axial groove.

4. A planter characterized by: The seed meter front drive mechanism comprises the seed meter front drive mechanism according to any one of claims 1 to 3.

5. A method of sowing seeds using the sowing machine according to claim 4, characterized in that: The seed meter is intermittently operated and stopped according to a certain rule during the movement, and the seed meter is cyclically implemented in the direction of movement, and a length of seeds is planted after each planting of a length.

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