An agricultural seeder

Abstract

The present invention provides an agricultural seed drill, relating to the technical field of seeding equipment, comprising a profiling frame mounted on a frame, a furrow opener connected to the profiling frame, and a pressing wheel, wherein the profiling frame is a four-bar linkage having a lower link and a side link, the furrow opener being rotatably connected to the side link, a pressure wheel frame being hingedly connected to the side link, the pressing wheel frame being rotatably connected to the pressure wheel frame, a pressure wheel spring being connected between the pressure wheel frame and the side link, a locking rod being hingedly connected to the side link, a locking rod spring being connected between the locking rod and the side link, a locking tooth being provided at the top of the locking rod, a locking tooth being provided at the end of the lower link, a locking tooth being meshed with the locking tooth, and a material-diverting baffle being connected to the end of the locking rod. The material-diverting baffle of the present invention can rotate when digging soil, locking the profiling frame, preventing the furrow opener from floating upward, allowing the pressing wheel to crush and pass over soil clods, thereby reducing the influence of the up-and-down floating of the furrow opener on the furrowing depth in a short period of time.

Description

Technical Field

[0001] The present invention relates to the technical field of sowing equipment, in particular to an agricultural sowing machine. Background Art

[0002] A seeder is a planting machine that sows crop seeds into the soil. It is generally composed of a frame, a traction or suspension device, a seed box, a seed meter, a transmission device, a seed tube, a furrow opener, a row marker, a travel wheel, and a covering device. A seed drill is a type of seeder, mainly used for sowing small seeds such as cereals, vegetables, and forage. During operation, the travel wheel drives the seed wheel to rotate, and the seeds in the seed box are discharged into the seed tube according to the required sowing amount, and fall into the opened furrow through the furrow opener, and then the seeds are covered and compacted by the covering and pressing device. The combined seeder consists of a sowing component and related operating components. While sowing, it can complete multiple related operations such as rotary tillage, fertilization, covering, and pressing.

[0003] For example, patent publication CN115413436B discloses a multi-adjustable, integrated direct seeding machine. The machine includes a fertilizer storage box, a weed spreader, a seeding mechanism, a rotary roller, and a plowshare. These mechanisms, along with the weed spreader, plowshare, dropper, seeding mechanism, and spraying baffle, enable continuous weed spreading, rotary tillage, furrowing, fertilization, seeding, and spraying in a single operation.

[0004] When sowing, the terrain is uneven. If the seeder cannot adjust according to the height of the land, the sowing depth will be uneven. Some seeds are sown very deep, which makes it difficult for the seedlings to emerge, consumes too much energy, and the seedlings are weak; some are sown very shallowly, which are easily affected by drought, wind, etc., and are difficult to take root firmly, which will lead to inconsistent germination time and germination rate, and will also affect the uniformity of the seedlings.

[0005] Prior art has improved planters. Patent publication number CN109511326B discloses a no-till corn planter with synchronized side-deep fertilization. This planter uses a double-disc furrow opener to create a seed furrow and an L-shaped furrowing shovel to create a fertilizer furrow. A pressing wheel presses the seed furrow after sowing. A single-body four-bar contouring device is connected to one end of the frame, and the end connected to the single body is floating.

[0006] This seeder utilizes a single, four-bar contouring mechanism that automatically contours to the undulating ground surface. This helps ensure consistent seed and fertilizer furrow depths created by the double-disc furrow opener and L-shaped furrowing shovel, leading to consistent seeding and fertilizing depths. However, because the furrow opener and the press wheel float synchronously, the presence of irregular materials such as large clods of soil and straw in the cultivated land may affect the upward movement of the press wheel. This can cause the furrow opener and press wheel to float upward together for a short period of time, reducing the depth of the furrow opened by the furrow opener and resulting in shallower seeding in some areas. Summary of the Invention

[0007] In view of this, the present invention provides an agricultural seeder to solve the technical problem in the prior art that some large soil blocks in the cultivated land may cause the pressing wheel and the furrow opener to float upward in a short period of time, resulting in abnormal local seed depth.

[0008] To solve the above technical problems, the present invention provides an agricultural seeder, comprising a profiling frame mounted on a frame, a furrow opener and a pressing wheel connected to the profiling frame, the profiling frame being a four-bar linkage having a lower link and a first side link, the furrow opener being rotatably connected to the first side link, a pressure wheel frame being hingedly connected to the first side link and capable of abutting against the lower link, the pressing wheel being rotatably connected to the pressure wheel frame, and a pressure wheel spring being connected between the pressure wheel frame and the first side link;

[0009] An L-shaped locking rod is hinged on the side link one, and a locking rod spring is connected between the locking rod and the side link one. A locking tooth one is provided on the upper part of the locking rod near the lower link, and a locking tooth two is provided at the end of the lower link that engages with the locking tooth one. The end of the locking rod is connected to a material shifting baffle, which gradually tilts downward from the end close to the furrow opener to the end close to the pressing wheel.

[0010] By adopting this technical solution, the tractor drives the frame to move, which in turn drives the furrow opener and roller to rotate. After the furrow opener opens the furrow, the seeds fall, and the roller presses them down, embedding them in the soil. This increases the contact between the seeds and the soil, facilitates the seeds' absorption of soil moisture, and improves the emergence rate and uniformity of the seedlings. Furthermore, this compaction reduces large pores in the soil, slowing water evaporation and conserving moisture. The contoured frame, furrow opener, and roller float together, adapting to changes in the farmland's topography. When the surface of the plot is uneven, the contoured frame allows the furrow opener and roller to float up and down with the terrain, maintaining a relatively fixed distance from the ground. This promotes uniform sowing depth and helps the seeds obtain relatively consistent moisture, oxygen, and temperature conditions in the soil, thereby improving the germination rate and uniform emergence of the seeds.

[0011] The material-displacing baffle can push away clods in the soil, thereby reducing the impact of clods on the close contact between seeds and soil. Since the locking rod is hinged on the side link 1, when the clods are large, the material-displacing baffle rotates upward, thereby driving the upper end of the locking rod to rotate toward the lower link, so that the locking tooth 1 on the locking rod engages with the wheel 2 on the lower link, thereby locking the contour frame and preventing the furrow opener from floating upward. At the same time, as the frame moves, the pressure wheel can crush the clods. Under the elastic force of the pressure wheel spring, the pressure wheel can pass over the clods and assist the pressure wheel in compacting or crushing the clods when crushing the clods. During this process, the position of the furrow opener remains unchanged, which can reduce the impact of the floating up and down position of the furrow opener on the furrowing depth in a short period of time, thereby facilitating consistent seed sowing depth.

[0012] Preferably, the contour frame further comprises an upper connecting rod, a connecting piece is installed at a hinged portion between the upper connecting rod and the side connecting rod, a plurality of connecting holes are opened on the connecting piece, a contour spring is connected between the connecting hole and the lower connecting rod, and the elastic force of the pressure wheel spring is greater than the elastic force of the contour spring.

[0013] By adopting the above technical solution, the contour spring can separate the quadrilateral contour frame into a triangular structure, forming a triangular structure between the contour spring, lower connecting rod, and side connecting rod. The contour spring undergoes elastic deformation under pressure or tension, thereby maintaining the stability of the pressure wheel's pressure and achieving good pressure suppression performance. The connector is provided with multiple connection holes, and the contour spring can be connected to one of these connection holes and the lower connecting rod. This allows the elastic coefficient of the contour spring to be adjusted. A larger elastic coefficient provides a stronger pressure suppression effect for the pressure wheel, but a relatively poorer cushioning effect. A smaller elastic coefficient provides a better cushioning effect, but a weaker pressure suppression effect. When the contour frame drives the pressure wheel and trench opener to adapt to different terrains, the elastic force of the contour spring allows the pressure wheel and trench opener to float. When encountering a large clod, wheel one engages with wheel two, locking the contour frame and securing the contour spring. When the pressure wheel crushes the clod, the elastic action of the pressure spring allows the pressure wheel to float and crush the clod.

[0014] Preferably, an inverted U-shaped scraper is installed on the pressure wheel frame, and the scraper can scrape off the soil on both sides of the furrow opener.

[0015] By adopting this technical solution, during the sowing process, the furrow opener will come into contact with various debris, such as weeds, straw, and soil. The scraper can promptly remove any debris adhering to the furrow opener, preventing accumulation that could affect its normal operation and facilitating smooth furrowing and consistent depth. In cohesive soils, the furrow opener is prone to soil adhesion during operation, increasing its weight and rotational resistance, and even affecting sowing depth and quality. The scraper continuously scrapes the surface of the furrow opener, reducing the amount of clay adhering to it and keeping it in good working condition.

[0016] Preferably, covering rods are installed on both sides of the pressing wheel on the pressing wheel frame, the ends of the covering rods away from the pressing wheel frame are V-shaped, and the parts of the covering rods close to the pressing wheel are spirally coiled.

[0017] By adopting this technical solution, the covering rod can move the soil. The V-shaped end of the covering rod, away from the pressure wheel frame, helps the soil cover the seeds, thereby retaining soil moisture and nutrients and improving seed germination rate. The spirally coiled covering rod has a certain degree of flexibility and elasticity, and can adapt to a certain degree of stretching, bending, or deformation, so that the covering rod can float to facilitate adaptation to different terrains.

[0018] Preferably, the contoured frame further comprises a second side link hinged to the upper link and the lower link, the second side link is connected to a fixing frame, and the fixing frame is connected to the frame.

[0019] By adopting the above technical solution, the side link 2 is opposite to the side link 1, and the contour frame is fixed to the frame through the fixing frame. The tractor drives the frame to move, and then drives the pressing wheel and the furrow opener to rotate, thereby realizing furrowing, sowing and pressing.

[0020] Preferably, a rotary tillage roller is rotatably connected to the frame, a plurality of rotary tillage blades are provided on the rotary tillage roller, and a pressing roller is rotatably mounted on one side of the rotary tillage roller on the frame.

[0021] By adopting the above technical solution, the movement of the frame drives the rotation of the rotary tillage roller and the pressing roller. The rotary tillage roller drives the rotary blade to rotary till the cultivated land, turning, loosening and breaking the soil, making the soil more oxygenated, enhancing the soil's aeration and water permeability, and promoting the decomposition of organic matter and the release of nutrients in the soil. This is conducive to creating a good soil tillage layer structure and surface state, coordinating factors such as water, nutrients, air, and heat, improving soil fertility, and providing good conditions for sowing, crop growth, and field management. After rotary tillage, the pressing roller can compact the soil, reduce air permeability and moisture loss, so that the seeds can be in close contact with the soil after sowing, which is conducive to improving the seed germination rate.

[0022] Preferably, a plurality of roller thorns are provided at intervals on the circumference of the pressing roller.

[0023] By adopting this technical solution, the roller thorns can break up larger soil clods, making soil particles more uniform, thereby improving soil compaction. The roller thorns penetrate the soil, increasing the contact area and friction between the roller and the soil, allowing the roller to more tightly bond with the soil, thereby more effectively compacting the soil. At the same time, the roller thorns can reduce soil adhesion to the roller, which helps reduce the resistance of the roller's movement and improve operational efficiency.

[0024] Preferably, a fertilizer bin is provided on the frame above the rotary tillage roller, a fertilizer discharge pipe is provided obliquely below the fertilizer bin, and the mouth of the fertilizer discharge pipe is located between the rotary tillage roller and the pressing roller.

[0025] By adopting the above technical solution, after the rotary tillage roller tills the soil, the fertilizer in the fertilizer bin falls through the fertilizer pipe and is then compacted by the compacting roller. This compaction compacts the soil, reduces voids in the soil, and prevents fertilizer from being lost with water or volatilized by air circulation. At the same time, compaction promotes full contact between the soil and the fertilizer, allowing the fertilizer to dissolve and diffuse better in the soil. It also reduces the possibility of fertilizer being lost to the air in the form of gas, facilitating its absorption by crop roots, thereby improving fertilizer utilization.

[0026] Preferably, a seed bin is provided above the pressing roller, and a feed pipe is provided on the furrow opener.

[0027] By adopting the above technical solution, after the pressing roller presses, the furrow opener opens the furrow, the seeds in the seed bin fall through the feed pipe, the pressing wheel presses the seeds, and the covering rod moves the soil to cover the seeds, completing the sowing operation.

[0028] Preferably, a covering plate is hingedly connected to the frame between the pressing roller and the lower fertilizer pipe.

[0029] By adopting the above technical solution, the covering plate can move the soil and form a covering layer on the soil surface, which reduces the direct evaporation of soil moisture, plays a role in retaining moisture, helps maintain suitable soil humidity, and provides good moisture conditions for seed germination and seedling growth. At the same time, it covers the fallen fertilizer, which helps to reduce fertilizer loss.

[0030] The beneficial effects of the above technical solution of the present invention are as follows:

[0031] 1. The material-displacing baffle of the present invention can dislodge clods in the soil. When the clods are large, the material-displacing baffle can rotate to lock the contour frame, and the furrow opener will not float upward. At the same time, as the frame moves, the pressure wheel can crush and pass over the clods under the elastic force of the pressure wheel spring. During this process, the position of the furrow opener remains unchanged, which can reduce the influence of the up and down floating of the furrow opener on the furrowing depth in a short period of time, thereby facilitating consistent seed sowing depth.

[0032] 2. The contouring spring on the contouring frame of the present invention can maintain the stability of the pressing wheel's pressing, and the elastic coefficient of the contouring spring is adjustable, so that it can be adapted to the pressing of farmland with different terrains and soil conditions.

[0033] 3. After the rotary tillage roller of the present invention tills the soil, the fertilizer in the fertilizer bin falls through the fertilizer pipe and is then pressed by the pressing roller, which can compact the soil and reduce the loss of fertilizer with water. It also reduces the possibility of fertilizer being lost into the air in the form of gas, and also facilitates the close contact between the seeds and the soil after sowing, which is beneficial to improving the germination rate of the seeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the agricultural seeder of the present invention;

[0035] Figure 2 A side view of the agricultural seeder of the present invention;

[0036] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0037] Figure 4 It is a structural schematic diagram of the contour frame, the pressing wheel and the furrow opener of the present invention;

[0038] Figure 5 A side view of the contour frame, press wheel and furrow opener of the present invention;

[0039] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0040] Figure 7 It is a side view of the material-diverting baffle of the present invention.

[0041] In the figure: 1, frame; 11, fertilizer pipe; 12, chain box; 13, power wheel; 131, ball joint; 132, connecting rod; 14, soil cover plate; 15, mud scraper; 2, rotary roller; 21, rotary blade; 3, pressure roller; 31, roller thorn; 4, profiling frame; 41, side link 1; 411, pressure wheel frame; 412, connecting frame; 413, pressure wheel spring; 42, upper connecting rod; 43, side link 2; 4 31. Fixed frame; 44. Lower connecting rod; 441. Locking tooth 2; 45. Locking rod; 451. Locking rod spring; 452. Locking tooth 1; 453. Material removal baffle; 454. Mounting plate; 46. Connecting piece; 461. Connecting hole; 462. Contour spring; 47. Scraper; 48. Covering rod; 5. Furrow opener; 51. Feeding pipe; 52. Disc; 6. Pressing wheel; 7. Seed bin; 8. Fertilizer bin. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the embodiments of the present invention. Figure 1-Figure 7 , clearly and completely describe the technical solutions of the embodiments of the present invention.

[0043] Example

[0044] This embodiment provides an agricultural seeding machine, such as Figure 1 As shown, the machine comprises a frame 1 towed by a tractor, on which a rotary tillage roller 2, a pressing roller 3, a furrow opener 5, and a pressing wheel 6 are connected and rotated in sequence along the direction of travel. A fertilizer bin 8 and a seed bin 7 are also provided above the frame 1. The fertilizer bin 8 is located above the rotary tillage roller 2, and the seed bin 7 is located above the pressing roller 3.

[0045] like Figure 1 As shown, the axes of the rotary tillage roller 2, the pressing roller 3, the furrow opener 5 and the pressing wheel 6 are parallel and perpendicular to the travel direction of the frame 1. There are multiple furrow openers 5 evenly distributed along the axis direction of the furrow opener 5. Similarly, there are multiple pressing wheels 6 evenly distributed along the axis direction of the pressing wheel 6, and each pressing wheel 6 corresponds to a furrow opener 5 one by one.

[0046] like Figure 1 As shown, a plurality of rotary blades 21 are mounted around the rotary roller 2. The rotary blades 21 rotate with the rotary roller 2 to till the land, providing favorable conditions for sowing, crop growth, and field management. After rotary tillage, the soil is compacted by the pressing roller 3, which reduces air loss and moisture loss, allowing seeds to adhere to the soil after sowing, thereby improving seed germination rates.

[0047] like Figure 1 As shown, a plurality of fertilizer delivery pipes 11 are obliquely provided on the frame 1 below the fertilizer bin 8 , and the pipe openings of the fertilizer delivery pipes 11 are located between the rotary tillage roller 2 and the pressing roller 3 .

[0048] like Figure 2 and Figure 3 As shown, a fertilizer dispenser (not shown) is rotatably connected to the fertilizer bin 8. This is a commonly used commercial fertilizer dispenser, and its structure will not be described in detail. The fertilizer dispenser is driven by a pressure roller 3. Specifically, the rotating shaft of the fertilizer dispenser is connected to the rotating shaft of the pressure roller 3 by a chain (not shown). The chain is located in a chain box 12 mounted on the frame 1. The movement of the frame 1 drives the pressure roller 3 to rotate, which in turn drives the fertilizer dispenser through the chain, causing the fertilizer to fall.

[0049] like Figure 1 As shown, after the rotary tillage roller 2 tills the cultivated land, the fertilizer in the fertilizer bin 8 falls through the fertilizer pipe 11, and then the pressing roller 3 presses it, which can compact the soil and reduce the loss of fertilizer with water. At the same time, it also reduces the possibility of fertilizer being lost into the air in the form of gas, reduces air permeability and moisture loss, and also facilitates the close contact between the seeds and the soil after sowing, which is beneficial to improving the germination rate of seeds.

[0050] like Figure 2 and Figure 3As shown, a scraper blade 15 is obliquely provided on one side of the pressing roller 3 on the frame 1. The scraper blade 15 gradually tilts downward from the side away from the pressing roller 3 to the side close to the pressing roller 3. The scraper blade 15 can scrape off the mud on the pressing roller 3, which is beneficial to reducing the movement resistance of the pressing roller 3.

[0051] like Figure 2 and Figure 3 As shown, a covering plate 14 is hingedly connected between the pressing roller 3 and the lower fertilizer pipe 11 on the frame 1. The covering plate 14 gradually tilts downward from one end close to the rotary tillage roller 2 to the end close to the pressing roller 3.

[0052] like Figure 3 As shown, the covering plate 14 can move the soil and form a covering layer on the soil surface, which reduces the direct evaporation of soil moisture, plays a role in retaining moisture, helps maintain suitable soil humidity, and provides good moisture conditions for seed germination and seedling growth. At the same time, it covers the fallen fertilizer, which helps to reduce fertilizer loss.

[0053] like Figure 2 and Figure 3 As shown, the roller 3 is provided with a plurality of roller thorns 31 at intervals around its circumference. The roller thorns 31 can break up soil clods and make soil particles more uniform, thereby improving soil compaction. At the same time, the roller thorns 31 can reduce soil adhesion to the roller 3, thereby reducing the resistance of the roller 3 to movement and improving working efficiency.

[0054] like Figure 2 As shown, the furrow opener 5 then opens a furrow, and the seeds in the seed bin 7 fall down. The pressing wheel 6 presses the seeds, embedding them in the soil and increasing the contact between the seeds and the soil. This embodiment, after two pressing operations, can make the soil around the seeds more compact, allowing the seeds to fully contact the wet soil, which is conducive to the seeds absorbing moisture from the soil, improving the emergence rate and uniformity of the seedlings. At the same time, it has a certain suppressive effect on weed seeds or seedlings on the soil surface, which can hinder the growth and emergence of weeds.

[0055] Among them, such as Figure 4 As shown, the furrow opener 5 and the pressing wheel 6 are arranged on the contour frame 4. The number of the contour frames 4 is consistent with the number of the furrow openers 5. The contour frame 4 is a closed four-bar linkage mechanism.

[0056] like Figure 2 and Figure 4 As shown, the contour frame 4 includes a side link 1 41, an upper link 42, a side link 2 43, and a lower link 44, which are hinged in sequence. Among them, the side link 2 43 is close to the frame 1. The side link 2 43 is connected to a fixing frame 431, which is connected to the frame 1 so that the frame 1 drives the contour frame 4, the furrow opener 5, and the pressing wheel 6 to move forward.

[0057] like Figure 4 As shown, side link 1 41 is positioned opposite side link 2 43, and upper link 42 and lower link 44 are opposite each other. Side link 1 41, lower link 44, side link 2 43, and upper link 42 form a closed loop, and an extension is provided downwardly. Ditch opener 5 is rotatably mounted on the extension. Ditch opener 5 is a commercially available double disc 52-type trench opener 5, and its structure is not further described.

[0058] like Figure 4 As shown, there are two side links 43, upper links 42, and lower links 44, each of which is hinged to form two groups. Both groups of side links 43, upper links 42, and lower links 44 are hinged to one side link 41. Both side links 43 are connected to the fixing frame 431. The two lower links 44 are hinged to the two sides of the side link 41.

[0059] like Figure 4 and Figure 5 As shown, the two discs 52 of the furrow opener 5 are rotatably connected to the extended section of the side link 41 via a rotating shaft, and the side link 41 is located between the two discs 52.

[0060] like Figure 5 and Figure 6 As shown, a pressure wheel frame 411 is hinged on the extension section of the side link 1 41 . The pressure wheel frame 411 is located below the lower link 44 and can abut against the lower link 44 . The pressure wheel 6 is rotatably connected to the pressure wheel frame 411 .

[0061] like Figure 5 and Figure 6 As shown, an L-shaped connecting frame 412 is connected to the extended section of the side link 41 and located below the pressure wheel frame 411 , and a pressure wheel spring 413 is connected between the connecting frame 412 and the pressure wheel frame 411 .

[0062] like Figure 5 and Figure 6 As shown, an L-shaped locking lever 45 is hingedly connected to the extension of side link 1 41 and below the connecting bracket 412. Two locking levers 45 are provided, one at each end of side link 1 41. A locking lever spring 451 is connected between the locking lever 45 and the connecting bracket 412. The locking lever 45 can rotate along its hinge axis, and the upper ends of the two locking levers 45 can respectively abut the ends of the two lower connecting rods 44.

[0063] like Figure 5 and Figure 6As shown, a first locking tooth 452 is provided on the upper portion of the locking lever 45, near the lower connecting rod 44. A second locking tooth 441 is provided at the end of the lower connecting rod 44, which engages with the first locking tooth 452. When the locking lever 45 is rotated upward along its hinge axis, the first locking tooth 452 and the second locking tooth 441 engage, preventing the lower connecting rod 44 from moving, thereby locking the contour frame 4. When the locking lever 45 is rotated downward along its hinge axis, the first locking tooth 452 and the second locking tooth 441 disengage, releasing the lock on the contour frame 4. The contour frame 4 can float, and the furrow opener 5 and the press wheel 6 can also float, facilitating adaptation to changes in the cultivated land topography and facilitating consistent sowing depth.

[0064] like Figure 5 and Figure 6 As shown, a mounting plate 454 is mounted on one end of the two locking rods 45 opposite to the locking tooth 1 452, and a material-diverting baffle 453 is mounted on the lower end of the mounting plate 454. The material-diverting baffle 453 is located between the pressing wheel 6 and the furrow opener 5. Figure 7 As shown, the material-diverting baffle 453 is V-shaped, and the material-diverting baffle 453 gradually tilts downward from one end close to the furrow opener 5 to one end close to the pressing wheel 6. The lower end of the material-diverting baffle 453 is higher than the lower end of the pressing end.

[0065] like Figure 5 and Figure 6 As shown, the material-moving baffle 453 can move away the clods in the soil, thereby reducing the impact of the clods on the close contact between seeds and soil, thereby facilitating the seeds to absorb moisture in the soil and improving the emergence rate.

[0066] like Figure 5 and Figure 6 As shown, since the locking rod 45 is hinged on the side link 1 41, when the soil clod is large, the end of the material-dispensing baffle 453 near the furrow opener 5 contacts the soil clod. As the frame 1 moves, the material-dispensing baffle 453 overcomes the elastic force of the locking rod spring 451 and rotates upward, thereby causing the locking rod 45 to rotate synchronously. The upper part of the locking rod 45 rotates toward the direction close to the lower link 44, so that the locking tooth 1 452 on the locking rod 45 engages with the locking tooth 2 441 on the lower link 44, thereby locking the contour frame 4 and preventing the furrow opener 5 from floating upward. At the same time, as the frame 1 moves, under the elastic force of the pressure wheel spring 413, the pressure wheel 6 can pass over the soil clod and assist the pressure wheel 6 in compacting or crushing the soil clod when rolling it. During this process, the position of the furrow opener 5 remains unchanged, which can reduce the influence of the floating position of the furrow opener 5 on the furrowing depth in a short period of time, thereby facilitating a consistent depth of seed sowing.

[0067] like Figure 5 and Figure 6As shown, a plate-shaped connector 46 is mounted at the hinged portion between the upper link 42 and the side link 1 41. Connecting member 46 has multiple connecting holes 461 formed therein, and a contour spring 462 is connected between the connecting holes 461 and the lower link 44. The spring force of the pressure wheel spring 413 is greater than the spring force of the contour spring 462.

[0068] like Figure 5 As shown, the contour spring 462 can separate the quadrilateral contour frame 4 into a triangular structure, that is, a triangular structure is formed between the contour spring 462, the lower connecting rod 44 and the side connecting rod. The contour spring 462 will undergo elastic deformation due to pressure or tension, thereby maintaining the stability of the pressing wheel 6 and achieving good pressing performance.

[0069] like Figure 5 and Figure 6 As shown, when the contour frame 4 drives the pressing wheel 6 and the furrow opener 5 to adapt to different terrains, the elastic force of the contour spring 462 can make the pressing wheel 6 and the furrow opener 5 float. When encountering larger clods of soil, the locking tooth 1 452 engages with the locking tooth 2 441, the contour frame 4 is locked, and the contour spring 462 is fixed. When the pressing wheel 6 crushes the clods of soil, the elastic action of the pressure wheel spring 413 can make the pressing wheel 6 float and crush the clods of soil.

[0070] like Figure 5 and Figure 6 As shown, the connecting member 46 is provided with a plurality of connecting holes 461. A contour spring 462 can be connected to one of the connecting holes 461 and the lower connecting rod 132. This allows the elastic coefficient of the contour spring 462 to be adjusted. A larger elastic coefficient results in a stronger suppressing effect provided by the pressure wheel 6, but a relatively weaker cushioning effect. A smaller elastic coefficient results in a better cushioning effect provided by the pressure wheel 6, but a weaker suppressing effect.

[0071] like Figure 4 and Figure 5 As shown, an inverted U-shaped scraper 47 is installed on the pressure wheel frame 411. The two ends of the scraper 47 can respectively abut against the two discs 52 of the furrow opener 5. The scraper 47 can scrape off the soil on both sides of the furrow opener 5, which is beneficial to reducing the influence of the soil adhering to the furrow opener 5 on the width and depth of the furrow, and at the same time, it is beneficial to reduce the resistance of the furrow opener 5 to its movement.

[0072] like Figure 4 and Figure 5 As shown, a covering rod 48 is installed on both sides of the pressing wheel 6 on the pressing wheel frame 411, and the end of the covering rod 48 away from the pressing wheel frame 411 is V-shaped. After the pressing wheel 6 presses the seeds, the covering rod 48 can move the soil, which helps to cover the seeds with soil, thereby facilitating the retention of soil moisture and nutrients and improving the germination rate of the seeds.

[0073] like Figure 4 and Figure 5 As shown, the portion of the covering rod 48 close to the pressing wheel 6 is spirally wound, which can make the covering rod 48 float to a certain extent, so as to adapt to different terrains.

[0074] like Figure 1 As shown, a power wheel 13 is rotatably connected to one side of the seed bin 7 on the frame 1. A seed meter (not shown) is rotatably connected to the seed bin 7. This commonly used seed meter is not described in detail here. The seed meter is driven by the power wheel 13. Ball joints 131 are mounted on the rotational axis of both the power wheel 13 and the seed meter, with a connecting rod connecting the two ball joints 131. The movement of the frame 1 rotates the power wheel 13, which in turn rotates the seed meter via the connecting rod, achieving seed placement.

[0075] like Figure 5 As shown, the furrow opener 5 is provided with a feeding pipe 51. After the pressing roller 3 presses, the furrow opener 5 opens the furrow, and the seeds in the seed bin 7 fall through the feeding pipe 51, the pressing wheel 6 presses the seeds, and the covering rod 48 moves the soil to cover the seeds, completing the sowing operation.

[0076] The implementation principle of the agricultural seeder of this embodiment:

[0077] The tractor pulls the frame 1 forward, the rotary tillage roller 2 and the pressing roller 3 rotate, and the rotary tillage blade 21 on the rotary tillage roller 2 rotary tills the cultivated land, providing good conditions for sowing, crop growth and field management.

[0078] The pressing roller 3 drives the fertilizer discharger to rotate through a chain, so that the fertilizer in the fertilizer bin 8 falls and falls between the rotary roller 2 and the pressing roller 3 through the fertilizer discharge pipe 11. The pressing roller 3 presses the fertilizer to reduce the loss of fertilizer with water, and also makes it easier for the seeds to be in close contact with the soil after sowing, which is beneficial to improving the germination rate of the seeds.

[0079] The furrow opener 5 opens the furrow, the seeds in the seed bin 7 fall down, and the pressing wheel 6 presses the seeds so that the seeds are embedded in the soil, thereby increasing the close contact between the seeds and the soil.

[0080] Since the furrow opener 5 and the pressing wheel 6 are mounted on the contour frame 4, the pressing wheel 6, the furrow opener 5 and the contour frame 4 can float, thereby facilitating adaptation to changes in the topography of the cultivated land.

[0081] The material-moving baffle 453 can move away clods in the soil, thereby reducing the impact of the clods on the close contact between seeds and soil.

[0082] When the soil clod is large, the end of the material-dispensing baffle 453 near the furrow opener 5 contacts the soil clod. As the frame 1 moves, the material-dispensing baffle 453 overcomes the elastic force of the locking rod spring 451 and rotates upward, thereby causing the locking rod 45 to rotate synchronously. The upper part of the locking rod 45 rotates toward the direction close to the lower connecting rod 44, so that the locking tooth 1 452 on the locking rod 45 engages with the locking tooth 2 441 on the lower connecting rod 44, thereby locking the contour frame 4 and preventing the furrow opener 5 from floating upward. At the same time, as the frame 1 moves, under the elastic force of the pressure wheel spring 413, the pressure wheel 6 can pass over the soil clod and assist the pressure wheel 6 in compacting or crushing the soil clod when rolling it. During this process, the position of the furrow opener 5 remains unchanged, which can reduce the influence of the floating position of the furrow opener 5 on the furrowing depth in a short period of time, thereby facilitating the consistent depth of seed sowing.

[0083] After the pressing wheel 6 presses the seeds, the covering rod 48 can move the soil, which helps to make the soil cover the seeds and complete the sowing operation.

[0084] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components.

Claims

1. An agricultural seed drill comprising a profiling frame (4) mounted on a frame (1), a furrow opener (5) and a pressing wheel (6) connected to the profiling frame (4), characterized in that: The contour frame (4) is a four-link mechanism having a lower link (44) and a side link (41). The furrow opener (5) is rotatably connected to the side link (41). A pressure wheel frame (411) capable of abutting against the lower link (44) is hingedly connected to the side link (41). The pressure wheel (6) is rotatably connected to the pressure wheel frame (411). A pressure wheel spring (413) is connected between the pressure wheel frame (411) and the side link (41). An L-shaped locking rod (45) is hinged on the side link (41), and a locking rod spring (451) is connected between the locking rod (45) and the side link (41). A locking tooth (452) is provided on the upper part of the locking rod (45) and close to the lower link (44). The end of the lower link (44) is provided with a locking tooth (441) engaged with the locking tooth (452). The end of the locking rod (45) is connected to a material-diverting baffle (453), and the material-diverting baffle (453) gradually tilts downward from an end close to the furrow opener (5) to an end close to the pressing wheel (6).

2. The agricultural seeder according to claim 1, characterized in that: The profiling frame (4) further comprises an upper connecting rod (42), a connecting member (46) being installed at a hinged portion between the upper connecting rod (42) and the side connecting rod (41), a plurality of connecting holes (461) being provided on the connecting member (46), a profiling spring (462) being connected between the connecting holes (461) and the lower connecting rod (44), and the elastic force of the pressure wheel spring (413) being greater than the elastic force of the profiling spring (462).

3. The agricultural seeder according to claim 2, characterized in that: An inverted U-shaped scraper (47) is installed on the pressure wheel frame (411), and the scraper (47) can scrape away the soil on both sides of the furrow opener (5).

4. The agricultural seeder according to claim 3, characterized in that: Covering rods (48) are installed on both sides of the pressing wheel (6) on the pressing wheel frame (411), and one end of the covering rod (48) away from the pressing wheel frame (411) is V-shaped, and the part of the covering rod (48) close to the pressing wheel (6) is spirally coiled.

5. The agricultural seeder according to claim 4, characterized in that: The profiling frame (4) further comprises a second side link (43) hinged to the upper link (42) and the lower link (44); a fixing frame (431) is connected to the second side link (43); and the fixing frame (431) is connected to the frame (1).

6. The agricultural seeder according to claim 5, characterized in that: A rotary tillage roller (2) is rotatably connected to the frame (1), a plurality of rotary tillage blades (21) are provided on the rotary tillage roller (2), and a pressing roller (3) is rotatably mounted on one side of the rotary tillage roller (2) on the frame (1).

7. The agricultural seeder according to claim 6, characterized in that: A plurality of roller thorns (31) are provided at intervals on the circumference of the pressing roller (3).

8. The agricultural seeder according to claim 7, characterized in that: A fertilizer bin (8) is provided on the frame (1) above the rotary tillage roller (2), and a fertilizer lowering pipe (11) is provided obliquely below the fertilizer bin (8). The pipe opening of the fertilizer lowering pipe (11) is located between the rotary tillage roller (2) and the pressing roller (3).

9. The agricultural seeder according to claim 8, characterized in that: A seed bin (7) is provided above the pressing roller (3), and a feeding pipe (51) is provided on the furrow opener (5).

10. The agricultural seeder according to claim 9, characterized in that: A covering plate (14) is hingedly connected between the pressing roller (3) and the lower fertilizer pipe (11) on the frame (1).

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