Corn planter with auxiliary planting depth control function

Abstract

The invention relates to a corn planter with a planting depth auxiliary control function, and belongs to the field of corn planting device.A seeding assembly comprises an inner column bin and an outer column bin coaxially and slidably mounted outside the inner column bin, a rotating block is coaxially and rotatably mounted at the bottom of the inner column bin, and a through hole allowing corn seeds to penetrate through is formed in one side of the bottom of the rotating block; a discharging hole is formed in one side of the bin bottom of the inner column bin, an outer gear ring is coaxially fixed to the outer side of the rotating block, and the outer gear ring is rotationally installed in the bin side wall of the inner column bin and is in transmission connection with a driven gear of a depth adjusting mechanism in the side wall of the inner column bin. The depth adjusting mechanism drives the outer column bin to slide downwards relative to the inner column bin to the set depth in the soil, and meanwhile, the rotating block rotates to the position where the penetrating hole is aligned with the discharging hole; a flashboard is also rotationally mounted in the outer bottom surface of the outer column bin, and a seeding hole is formed in the inner bottom surface of the outer column bin. The corn planting depth can be flexibly adjusted, and frequent adjustment of the depth of an existing sowing ditch is not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of corn planting equipment, and in particular to a corn planter with an auxiliary planting depth control function. Background Art

[0002] Adjusting different depths when sowing corn is essentially to adapt to complex environmental conditions and crop growth needs, and ultimately achieve the goal of uniform emergence and healthy growth. This operation is closely related to many factors such as soil characteristics, climatic conditions, and the state of the seeds themselves.

[0003] From the perspective of soil, different types of soil have significant differences in their water retention and air permeability. Sandy soil has good air permeability but poor water retention. If planted too shallowly, the seeds will easily become dry due to rapid water loss, affecting germination. Therefore, appropriate deep sowing is required to utilize the moisture in the deep soil. Heavy clay soil has poor air permeability. If sown too deeply, the seeds will have difficulty breathing due to lack of oxygen and may even rot. At this time, shallow sowing can reduce the risk of hypoxia and make it easier for seeds to break through the soil. In addition, the distribution of soil fertility will also affect the sowing depth. Fertile topsoil is suitable for shallow sowing, allowing seedlings to quickly absorb nutrients. If the surface layer is poor, deep sowing can allow the roots to come into contact with a richer nutrient layer. In addition, when planting corn on a large scale, it is impossible to ensure uniform field flatness. It can only be large and uneven. To ensure uniform emergence of seedlings in the field, it is necessary to automatically determine the sowing depth according to the different terrain heights.

[0004] Furthermore, adjusting the sowing depth also lays the foundation for corn's entire growth period. The appropriate sowing depth promotes deep root growth, forming a strong root network that not only absorbs water and nutrients more efficiently but also enhances the plant's resistance to lodging and drought. Improper sowing depth can result in either "tall" or "weak" seedlings, both of which directly impact final yield. Therefore, corn sowing depth control needs to be adjusted according to different growing environments.

[0005] Existing corn planting equipment often digs a seeding furrow directly into the ground. This is essentially the same as sowing other crops: corn seeds are sown in intervals within the furrow and then covered and backfilled. This is a common sowing method. However, existing corn planting equipment can only adjust the planting depth by adjusting the depth of the dug seeding furrow. When the soil structure in an area is complex and changeable, it is necessary to constantly adjust the trench depth or deepen the existing seeding furrow, which is very inconvenient. Summary of the Invention

[0006] In view of this, an object of the present invention is to provide a corn planter with an auxiliary planting depth control function to solve the technical problems raised in the background technology.

[0007] The present invention is achieved through the following technical solutions:

[0008] The outer gear ring is coaxially fixed to the outer side of the rotating block, and the outer gear ring is rotatably mounted in the bin side wall of the inner column bin and is connected to the driven gear of a depth adjustment mechanism in the side wall of the inner column bin when the outer gear ring rotates. The depth adjustment mechanism drives the outer column bin to slide downward relative to the inner column bin to a set depth in the soil, and the rotating block rotates to a position where the perforation and the drop hole are aligned; a gate plate is also rotatably mounted in the outer bottom surface of the outer column bin, and the inner bottom surface is provided with a sowing hole. The gate plate closes the sowing hole under normal conditions and can be rotated to a position where the sowing hole is completely opened during sowing.

[0009] Furthermore, the rotating block is cylindrical, and the outer gear ring is coaxially fixed on the side wall of the top end.

[0010] Furthermore, a trumpet hole is provided above the through hole of the rotating block and is integrally connected thereto, and the inner diameter of the large port at the top of the trumpet hole is equal to the inner diameter of the inner column bin.

[0011] Furthermore, a feeding funnel is installed on the top of the inner column bin. The feeding funnel is located above the perforation and is used for injecting corn seeds.

[0012] Furthermore, the top end of the outer column bin is provided with a horizontally arranged expansion groove plate, and a push plate is fixed perpendicularly to the front upper edge of the expansion groove plate, and the push plate is an arc-shaped plate structure.

[0013] Furthermore, one side of the outer bottom surface of the outer column bin is provided with a sinking platform, on which the gate plate is rotatably mounted, and the thickness of the gate plate is not less than the vertical dimension of the corn seeds in any posture; the edge of the gate plate on the side away from its rotation direction when the sowing hole is opened is a blade-like structure.

[0014] Furthermore, the gate is rotatably installed through a rotating rod that can elastically extend and retract axially. The rotating rod is rotatably installed on the side wall of the inner column bin and the bottom of the outer column bin. The top of the rotating rod is transmission-connected to the first micro motor installed on the top of the inner column bin.

[0015] Furthermore, a driving gear is rotatably installed in the side wall of the inner column bin, and the gear shaft of the driving gear is vertically arranged and is transmission-connected to a second micro motor, which is installed on the top of the inner column bin.

[0016] Furthermore, the depth adjustment mechanism also includes a guide rod coaxially fixed to the top end of the driven gear, and a screw rod coaxially fixed to the bottom end of the driven gear. The guide rod vertically slides with the side wall of the inner column bin, and the screw rod is threadedly engaged with the side wall of the inner column bin and extends out from the bottom of the inner column bin to drive the outer column bin to move vertically. The tooth thickness of the driven gear must ensure that it always remains engaged with the driven gear within the depth adjustment range.

[0017] Furthermore, an adjusting rod is coaxially provided at the top of the guide rod, and a part of the adjusting rod is screwed into the guide rod or the driven gear or the screw in a threaded manner; the top of the adjusting rod is provided with an adjusting cap, and a compression spring that is always in an extruded state is also provided between the adjusting cap and the inner column bin, and a smooth gasket is connected to the bottom end of the compression spring, and the gasket is in smooth contact with the top surface of the inner column bin; a tubular scale barrel is also coaxially provided on the outside of the compression spring, and a plurality of scale lines are provided on the outer surface of the scale barrel. The top end of the scale barrel is fixed on the adjusting cap, and the bottom end is rotatably inserted into the annular slot on the top surface of the inner column bin, and the bottom end of the adjusting rod is rotatably connected to the inner bottom of the outer column bin.

[0018] The beneficial effects of the present invention are:

[0019] This corn planter, equipped with auxiliary planting depth control, features a unique design for its seeding assembly. This assembly forms a seeding furrow as the travel mechanism moves forward, eliminating the need for additional furrowing steps and tools, and adjusting the furrow depth to accommodate corn planting depth, thus reducing the workload involved in furrowing. During the furrowing process, the outer gear ring intermittently rotates forward and reverse, causing the outer column bin to intermittently move up and down. When fully lowered, the gate rotates to open the seeding hole, achieving seeding at the corresponding depth. The furrowing depth remains unchanged, requiring only the downward movement of the outer column bin within the corresponding area. This allows for flexible adjustment of the seeding depth over a large area to accommodate varying soil types and depths.

[0020] In addition, the furrow expansion plate and push plate in the present invention can flatten the top surface of the sowing furrow, so that the depth of the sowing furrow is consistent in the true sense. That is, when the outer column bin moves forward horizontally, the top of the sowing furrow formed is neat, and then the depth and height are kept consistent. Then, on this basis, the outer column bin moves down to the corresponding depth, and finally the depth of corn seeds when sowing is controlled more accurately and simply.

[0021] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of a sowing assembly of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the sowing assembly of the present invention when the rotating block is rotated into place;

[0024] Figure 3 for Figure 2 Schematic diagram of corn seeds falling into the sowing hole in the structure shown;

[0025] Figure 4 This is a schematic diagram of corn seeds falling after the gate is opened;

[0026] Figure 5 This is a bottom view of the outer column bin when it is cylindrical;

[0027] Figure 6 This is a bottom view of the gate;

[0028] Figure 7 It is a top view of the connection structure between the expansion plate and the push plate;

[0029] Figure 8 for Figure 6 AA section view in;

[0030] Figure 9 This is a schematic diagram of the maximum size of a seed in one posture;

[0031] Figure 10 for Figure 1 The enlarged view of M in FIG.

[0032] Figure 11 for Figure 1 An enlarged view of the structure in the dotted rectangular box area in the lower left corner;

[0033] Figure 12 When the adjustment rod is screwed in further, Figure 11 Schematic diagram of the structure shown;

[0034] Figure 13 Schematic diagram of the holes in the sowing furrow in the field to be sown.

[0035] In the figure: inner column bin 1, outer column bin 2, sink 201, rotating block 3, outer gear ring 4, perforation 5, horn hole 6, driven gear 7, rotating rod 8, first micro motor 9, driving gear 10, gear shaft 11, second micro motor 12, feeding funnel 13, mounting arm 14, ditch expansion plate 15, push plate 16, drop hole 17, sowing hole 18, guide rod 20, screw 21, adjusting rod 22, gate 23, blade-like structure 2301, corn seeds 24, sowing furrow 25, seed pit 2501, adjusting cap 27, scale cylinder 28, scale line 29, compression spring 30, gasket 31, annular slot 32, soil to be planted 33. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0039] See also Figure 1-4 The present invention provides a technical solution: a corn planter with auxiliary control of planting depth function, including a traveling mechanism and a sowing assembly installed at the front end of the traveling mechanism. The traveling mechanism can be a common agricultural cart, or the traveling part of an existing sowing equipment. In this embodiment, the sowing assembly includes an inner column bin 1 and an outer column bin 2 coaxially slidably installed outside the inner column bin 1. The front and rear side walls of the inner column bin 1 near the top are respectively installed on the traveling mechanism through the mounting arms 14, so as to facilitate the sowing assembly to move forward. Specifically, if Figure 1 As shown, in this embodiment, a rotating block 3 is coaxially mounted on the bottom of the inner column bin 1. One side of the bottom of the rotating block 3 has a through hole 5 for corn seeds 24 to pass through. One side of the bottom of the inner column bin 1 has a drop hole 17 for corn seeds 24 to fall. An outer gear ring 4 is coaxially fixed to the outer side of the rotating block 3 to drive the entire rotating block 3 to rotate a certain angle. Specifically, as Figure 1As shown, the outer gear ring 4 is rotatably installed in the side wall of the inner column bin 1 and is connected to the driven gear 7 of a depth adjustment mechanism in the side wall of the inner column bin 1. Therefore, during operation, when the outer gear ring 4 rotates, the depth adjustment mechanism drives the outer column bin 2 to slide downward relative to the inner column bin 1 to a set depth in the soil to correspond to the corresponding planting depth. At the same time, the outer gear ring 4 rotates with the rotating block 3 to a position where the perforation 5 and the drop hole 17 are aligned, that is, the corn seeds 24 can pass through the drop hole 17 at this time. On the basis of the above-mentioned structural design, this embodiment also requires a gate plate 23 to be rotatably installed in the outer bottom surface of the outer column bin 2. The gate plate 23 can rotate in the horizontal plane. There is a sowing hole 18 on the inner bottom surface of the outer column bin 2. The sowing hole 18 is preferably larger than the drop hole 17. The sowing hole 18 can be a stepped hole that is smaller at the top and larger at the bottom. The gate plate 23 closes the sowing hole 18 under normal conditions, that is, it can be rotated to a position where the sowing hole 18 is completely opened during sowing. Specifically, the rotating block 3 is cylindrical, and an outer gear ring 4 is coaxially fixed to the side wall of its top, and the outer gear ring 4 is integrally formed with the rotating block 3. In order to facilitate the falling of the corn seeds 24, as shown in FIG. Figure 1 A trumpet hole 6 is provided above the through hole 5 of the rotating block 3 and is integrally connected thereto. The inner diameter of the large end of the top of the trumpet hole 6 is equal to the inner diameter of the inner column bin 1 .

[0040] In order to facilitate the transportation of corn seeds 24, a feeding funnel 13 is installed at the top of the inner column bin 1. This feeding funnel 13 is located above the perforation 5. This feeding funnel 13 is used to inject corn seeds 24. In addition, it is particularly important that in this embodiment, Figure 1 and Figure 7 , a horizontally arranged ditch expansion plate 15 is provided at the top of the outer column bin 2, and a push plate 16 is fixed perpendicularly to the front upper edge of the ditch expansion plate 15. The push plate 16 is an arc-shaped plate structure. This design makes it easy for the sowing component to move linearly and flatten the ground in the forward direction, thereby forming a sowing ditch 25 with a uniform depth. On the extension path of the sowing ditch 25, the outer column bin 2 intermittently slides down relative to the inner column bin 1, so as to Figure 13 As shown, a sowing furrow 25 is opened in the soil 33 to be planted, and seed pits 2501 for burying corn seeds 24 are formed at the bottom of the sowing furrow 25. The bottom of the seed pit 2501 is used to bury the corn seeds 24. To change the planting depth of corn, the outer gear ring 4 can be rotated to make the driving mechanism move downward with the outer column bin 2, so that the depth of the seed pit 2501 changes, that is, the corn planting depth changes.

[0041] In this embodiment, Figure 5As shown, a sinking platform 201 is provided on one side of the outer bottom surface of the outer column bin 2. In practice, whether the outer column bin 2 is rectangular or cylindrical, its outer surface can be half-depressed to form the above-mentioned sinking platform 201. A gate plate 23 is rotatably mounted on the sinking platform 201. The gate plate 23 can be Figure 6 As shown, this gate plate 23 is mainly used to control the opening and closing of the above-mentioned sowing hole 18. Therefore, in order to ensure that the corn seeds 24 will not be mistakenly pushed into the sowing hole 18 again by the gate plate 23 after falling through the sowing hole 18, it is necessary to ensure that the thickness of the gate plate 23 is not less than the thickness of the corn seeds 24 in any posture, such as Figure 9 The vertical dimension d shown, that is, no matter whether the corn seed 24 falls in a cooperative posture and stays at the bottom of the hole in the above-mentioned seed pit 2501, when the gate 23 rotates and returns to cover the sowing hole 18, the gate 23 can pass over the corn that has already stayed at the bottom of the hole, and then will not accidentally push the corn upward back into the sowing hole 18. In order to optimize the above technical effect and prevent the corn from falling back into the sowing hole 18, the gate 23 opens the sowing hole 18, such as Figure 5 As shown, the gate 23 moves toward the dotted outline, that is, rotates 90 degrees clockwise, and the edge of the side away from its rotation direction is a blade-like structure 2301, that is, Figure 6 The lower middle edge is blade-shaped. With this design, when the gate 23 rotates counterclockwise, that is, when it returns to the position of closing the sowing hole 18, the corn will not be pushed back into the sowing hole 18 by mistake.

[0042] In this embodiment, Figure 1 As shown, the gate plate 23 is rotatably installed through a rotating rod 8 that can axially elastically extend and retract. The reason for the axial elastic extension is mainly to adapt to the up and down movement of the outer column bin 2 relative to the inner column bin 1. The rotating rod 8 can be two round tubes (not shown in the figure) that are socket-fitted with each other and connected by an axially arranged tension spring, and the two tubes are also connected by a sliding key to achieve elastic extension and movement and change length. It can also be directly installed using other components that can be purchased on the market. This rotating rod 8 is rotatably installed on the side wall of the inner column bin 1 and the bottom of the outer column bin 2. The top of the rotating rod 8 is connected to the first micro motor 9 installed on the top of the inner column bin 1 so that the gate plate 23 can be rotated when needed to open the sowing hole 18.

[0043] In this embodiment, Figure 1As shown, a driving gear 10 is rotatably mounted in the side wall of the inner column bin 1. Specifically, a cavity (not shown) is machined in the inner column bin 1, and the driving gear 10 is rotatably mounted in the cavity. The gear shaft 11 of the driving gear 10 is vertically arranged and is in transmission connection with a second micro motor 12. The second micro motor 12 is mounted on the top of the inner column bin 1 to rotate the driving gear 10, that is, to rotate the rotating block 3. The rotation angle of the rotating hole can usually be set. For example, under normal conditions, when the perforation 5 is on the left and the blanking hole 17 is on the right, the outer gear ring 4 is driven to rotate 180 degrees each time.

[0044] In this embodiment, Figure 1 and Figure 10 , its depth adjustment mechanism also includes a guide rod 20 coaxially fixed to the top of the driven gear 7, and a screw rod 21 coaxially fixed to the bottom of the driven gear 7. The guide rod 20 vertically slides with the side wall of the inner column bin 1, and the screw rod 21 is threadedly engaged with the side wall of the inner column bin 1 and extends out from the bottom of the inner column bin 1 to drive the outer column bin 2 to move vertically. It should be noted that the tooth thickness of the driven gear 7 here must ensure that it always keeps meshing with the driven gear 7 within the depth adjustment range. Therefore, the driven gear 7 is a shaft-like structure with gear teeth on its surface. In addition, more specifically, if Figure 1 and Figure 10 In this embodiment, an adjusting rod 22 is coaxially provided at the top of the guide rod 20, and a portion of the adjusting rod 22 is threadedly screwed into the guide rod 20 or the driven gear 7 or the screw rod 21, that is, the adjusting rod 22 is threadedly connected to the integral structure formed by the guide rod 20, the driven gear 7, and the screw rod 21. Specifically, a threaded hole can be axially processed inside any one of these three components for the threaded portion of the adjusting rod 22 to threadably pass through, which is equivalent to twisting the adjusting rod 22 to achieve a change in the axial length of the integral rod-shaped part formed by the four components of the guide rod 20, the driven gear 7, the screw rod 21, and the adjusting rod 22, thereby adjusting the downward stroke of the outer column bin 2. For example, if the outer column bin 2 is completely submerged in the ground, the depth of the sowing furrow 25 itself is Figure 1 The length H of the outer column bin 2 shown can be used to adjust the sowing depth of the corn seeds 24. This can be achieved by adding the base value H to the displacement h of the outer column bin 2 relative to the inner column bin 1. That is, the depth is approximately H+h (because the actual depth is different due to the different postures of the corn seeds, but the difference in individual dimensions is very small). In practice, this can be achieved by screwing in and out the adjusting rod 22. For example, if the adjusting rod 22 is further screwed in to the position shown in the figure, the corresponding sowing depth is approximately H+N+h. Specifically, when in use, if the outer column bin 2 is completely immersed, the ditch expansion plate 15 and the push plate 16 also enter the soil. Then, the above-mentioned H value needs to be added with the depth value of the above-mentioned components immersed in the soil.

[0045] In order to facilitate adjustment and control, as shown in the figure, there is an adjustment cap 27 at the top of the adjustment rod 22. A compression spring 30 that is always in an extruded state is also provided between the adjustment cap 27 and the inner column bin 1. A smooth gasket 31 is connected to the bottom end of the compression spring 30. The gasket 31 is in smooth contact with the top surface of the inner column bin 1, so that the adjustment rod 22 always maintains a relatively stable installation posture, that is, it plays a pre-tightening role and will not rotate freely when not in operation.

[0046] In addition, in this embodiment, as shown in the figure, a tubular scale barrel 28 is coaxially provided on the outside of the compression spring 30, and a plurality of scale lines 29 are provided on the outer surface of the scale barrel 28. The top of the scale barrel 28 is fixed on the adjustment cap 27, and the bottom end is inserted into the annular slot 32 on the top surface of the inner column bin 1 in a rotationally fitting manner. The bottom end of the adjustment rod 22 is rotationally connected to the inner bottom of the outer column bin 2, so that when the adjustment cap 27 is rotated, the adjusted depth value can be judged by the scale lines 29 on the scale barrel 28. After sowing, the scale barrel 28 can be installed on the driving assembly, or as shown in FIG. Figure 13 As shown, the scraper 34 directly integrated into the sowing assembly scrapes the soil on both sides of the sowing furrow back into the sowing furrow to cover the corn seeds, and the scraper 33 can also ensure that the top of the sowing furrow is backfilled and flat when it moves horizontally.

[0047] In the above description of the present invention, it should be noted that the terms "one side," "the other side," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0048] Furthermore, the term "identical" and similar terms do not necessarily require that the components be absolutely identical; slight variations are permitted. The term "perpendicular" simply refers to the positional relationship between components being more perpendicular than "parallel," not that the structure must be perfectly vertical; rather, it can be slightly tilted.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A corn planter with auxiliary planting depth control function, comprising a traveling mechanism and a sowing assembly mounted at the front end of the traveling mechanism, characterized in that: The sowing assembly comprises an inner column bin (1) and an outer column bin (2) coaxially slidably mounted outside the inner column bin (1); a rotating block (3) is coaxially rotatably mounted on the bottom of the inner column bin (1); a bottom side of the rotating block (3) is provided with a perforation (5) for corn seeds (24) to pass through; a bottom side of the inner column bin (1) is provided with a drop hole (17) for corn seeds (24) to fall down; an outer ring gear (4) is coaxially fixed to the outer side of the rotating block (3); the outer ring gear (4) is rotatably mounted in the bin side wall of the inner column bin (1) and is transmission-connected to a driven gear (7) of a depth adjustment mechanism in the side wall of the inner column bin (1); when the outer ring gear (4) rotates, the depth adjustment mechanism drives the outer column bin (2) to slide downward relative to the inner column bin (1) to a set depth in the soil, and at the same time, the rotating block (3) rotates to a position where the perforation (5) and the drop hole (17) are aligned; A gate plate (23) is rotatably mounted on the outer bottom surface of the outer column bin (2), and a sowing hole (18) is provided on the inner bottom surface. The gate plate (23) closes the sowing hole (18) in a normal state and can be rotated to a position to completely open the sowing hole (18) during sowing.

2. The corn planter with auxiliary planting depth control function according to claim 1, characterized in that: The rotating block (3) is cylindrical, and the outer gear ring (4) is coaxially fixed on the side wall of the top end.

3. The corn planter with auxiliary planting depth control function according to claim 2, characterized in that: A trumpet hole (6) is provided above the through hole (5) of the rotating block (3) and is integrally connected thereto. The inner diameter of the top large end of the trumpet hole (6) is equal to the inner diameter of the inner column bin (1).

4. The corn planter with auxiliary planting depth control function according to claim 1, characterized in that: A feeding funnel (13) is installed at the top of the inner column bin (1). The feeding funnel (13) is located above the perforation (5). The feeding funnel (13) is used for injecting corn seeds (24).

5. The corn planter with auxiliary planting depth control function according to claim 1, characterized in that: The top end of the outer column bin (2) is provided with a horizontally arranged expansion groove plate (15), and a push plate (16) is fixed perpendicularly to the front upper edge of the expansion groove plate (15), and the push plate (16) is an arc-shaped plate structure.

6. The corn planter with auxiliary planting depth control function according to claim 1, characterized in that: One side of the outer bottom surface of the outer column bin (2) is provided with a sink (201), on which the gate plate (23) is rotatably mounted, and the thickness of the gate plate (23) is not less than the vertical dimension of the corn seed (24) in any posture; the edge of the gate plate (23) on the side away from the rotation direction when the sowing hole (18) is opened is a blade-like structure (2301).

7. The corn planter with auxiliary planting depth control function according to claim 1, characterized in that: The gate plate (23) is rotatably mounted via a rotating rod (8) that is axially elastically retractable. The rotating rod (8) is rotatably mounted on the side wall of the inner column bin (1) and the bottom of the outer column bin (2). The top end of the rotating rod (8) is transmission-connected to a first micro motor (9) mounted on the top of the inner column bin (1).

8. The corn planter with auxiliary planting depth control function according to claim 1, characterized in that: A driving gear (10) is also rotatably mounted in the side wall of the inner column bin (1). The gear shaft (11) of the driving gear (10) is vertically arranged and is transmission-connected to a second micro motor (12). The second micro motor (12) is mounted on the top of the inner column bin (1).

9. The corn planter with auxiliary planting depth control function according to any one of claims 1 to 8, characterized in that: The depth adjustment mechanism further comprises a guide rod (20) coaxially fixed to the top end of the driven gear (7), and a screw rod (21) coaxially fixed to the bottom end of the driven gear (7), wherein the guide rod (20) vertically slides with the side wall of the inner column bin (1), and the screw rod (21) is threadedly engaged with the side wall of the inner column bin (1) and extends out of the bottom of the inner column bin (1) to drive the outer column bin (2) to move vertically, and the tooth thickness of the driven gear (7) must be such that it always remains in meshing with the driven gear (7) within the depth adjustment range.

10. The corn planter with auxiliary planting depth control function according to claim 9, characterized in that: An adjusting rod (22) is coaxially provided at the top end of the guide rod (20), and a portion of the adjusting rod (22) is screwed into the guide rod (20) or the driven gear (7) or the screw rod (21) in a threaded manner; The top end of the adjusting rod (22) is provided with an adjusting cap (27), and a compression spring (30) which is always in a squeezed state is sleeved between the adjusting cap (27) and the inner column bin (1). The bottom end of the compression spring (30) is connected to a smooth gasket (31), and the gasket (31) is in smooth contact with the top surface of the inner column bin (1); A tubular scale tube (28) is coaxially provided on the outside of the compression spring (30). The outer surface of the scale tube (28) is provided with a plurality of scale lines (29). The top end of the scale tube (28) is fixed on the adjustment cap (27), and the bottom end is rotationally inserted into the annular slot (32) on the top surface of the inner column bin (1). The bottom end of the adjustment rod (22) is rotationally connected to the inner bottom of the outer column bin (2).

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