Four-rod-rubber roller combined type independent profiling seeding monomer

Abstract

The invention discloses a four-rod-rubber roller combined type independent profiling seeding monomer, which comprises a four-rod-rubber roller combined type profiling device, a monomer frame, a seeding device, a ditching device, a soil covering device and a pressing device. The rapid response capability of the seeding opener to surface fluctuation during soybean and corn compound planting can be obviously improved, and the seeding depth consistency is ensured. The seeder integrates the functions of soil breaking, ditching, seeding, soil covering and pressing, soil above a seed belt can be loosened and broken and tightly covered by pressing during seeding, air and heat supply is facilitated, the seedbed environment requirement that the upper portion is virtual and the lower portion is solid is met, and seed germination and seedling emergence are facilitated. The transverse width of the seeding monomer designed by the invention is 250mm, so that the agricultural requirement of small soybean line spacing during soybean and corn compound planting can be met, and the adaptability and passing ability of the seeding monomer are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of farmland seeders in agricultural machinery, and in particular relates to a four-rod-rubber roller combined independent contour-profiling sowing unit. Background Art

[0002] Corn and soybeans are important crops for both food and feed in China, accounting for 49% and 95% of the demand for food and feed, respectively. my country's corn production has developed rapidly, and its planting area and total output have both ranked first among my country's three major food crops; while soybean production has developed slowly. According to data from the official website of the National Bureau of Statistics, from 2004 to 2022, the average annual growth rate of sown area was only 0.35%, and the average annual growth rate of output during the same period was only 0.81%. Compared with the development of production, the demand for soybeans has grown rapidly, the gap between supply and demand has gradually widened, and the import volume has also risen year by year. In 2022, my country imported 91.08 million tons of soybeans, accounting for 81.79% of the total domestic soybean consumption. my country's arable land resources are limited. Under the premise of ensuring food security, the arable land resources used for soybean production are very limited; at the same time, the yield of soybeans is only one-third of that of corn, and planting competitive crops such as corn has higher comparative benefits. The contradiction between corn and soybeans for land has long been a major problem that has plagued food security.

[0003] As a new planting mode, strip-shaped composite planting of soybean and corn needs to reasonably configure the row ratio spacing of soybean and corn, reduce the spacing between plants and plant them closely, and apply fertilizers scientifically according to the agronomic requirements of soybean and corn planting. Rotary tillage is an important part of seedbed preparation in the ridge operation area of ​​soybean and corn composite planting. After rotary tillage, the soil changes from a compacted state to a loose particle of a certain particle size, which requires the furrow opener of the sowing unit to have a strong ability to cut off the covering material, break the soil and open furrows. When the composite planting sowing unit is operated on the surface of the ground with covering materials such as stubble or on the uneven and soft surface, the consistency and profiling ability of the sowing unit or the composite sowing unit of the existing single-crop sowing machine are poor, making it difficult to ensure the consistency of sowing depth, resulting in exposed seeds and low germination rate, which affects the growth and yield of crops; due to the large lateral width of the single-crop sowing machine unit, it is difficult to meet the narrow row planting of soybeans, resulting in poor adaptability and passability of the sowing unit; the existing single-crop sowing unit is mainly based on free-tillage land, and the unit is heavy, resulting in the problem of too deep ground compression after rotary tillage. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide an intelligent precision sowing control system for both rapeseed and wheat, which has optional rapeseed and wheat sowing types, greatly adjustable sowing amount per mu, and can automatically and intelligently control the operating state of the sowing mechanism driving electrical components according to the operating state of the seeder and accurately and dynamically adjust the sowing amount according to the operating speed.

[0005] A four-rod rubber roller combined independent profiling sowing unit comprises a four-rod rubber roller combined profiling device, a unit frame, a seeding device, a furrowing device, a soil covering device and a suppression device. The front end of the four-rod rubber roller combined profiling device is used to connect an external walking mechanism, and the rear end is hinged to the unit frame. The seeding device, the furrowing device and the soil covering device are fixed on the unit frame, and the suppression device is also fixed on the rear end. The four-rod rubber roller combined profiling device and the front positioning plate of the unit frame form a parallelogram four-rod structure, and a rubber roller is arranged in one hinged end of the four-rod rubber roller combined profiling device. The rubber roller is used to limit the profiling range of the four-rod rubber roller combined profiling device. When the suppression device moves on the ground, it can drive the unit frame to move up and down as the terrain changes, thereby changing the shape of the four-rod rubber roller combined profiling device.

[0006] Furthermore, the four-rod rubber roller combined profiling device includes a front connecting plate, a lower connecting rod and a profiling roller, the two ends of the front connecting plate are respectively hinged to the lower connecting rod and one end of the profiling roller, the other ends of the lower connecting rod and the profiling roller are respectively hinged to the front positioning plate of the single frame, the hinged ends of the front connecting plate and the profiling roller include two inner and outer nested rectangular frames, the two rectangular frames are respectively one end of the front connecting plate and the profiling roller and can rotate relative to each other, rubber rollers b are horizontally arranged in the gaps at the four corners of the two rectangular frames, and the rubber rollers b can contact with both rectangular frames in a natural state.

[0007] Furthermore, the single frame includes a front positioning plate for being hinged with the contour roller and the lower connecting rod, an upper crossbeam for fixing the seed box, a side fixing plate for fixing the seed meter, a lower connecting plate for connecting the furrowing device and the soil covering device, and a rear rectangular tube for connecting the pressing device to adjust the pressing depth.

[0008] Furthermore, the furrowing device includes a sliding knife furrow opener for furrowing, and an H-shaped connecting plate for fixing the furrow opener and having a sowing port; the sliding knife furrow opener and the H-shaped connecting plate are positioned by built-in buckles and connected by bolts; the H-shaped connecting plate and the lower connecting plate are connected by bolts.

[0009] Furthermore, the soil covering device includes a soil covering device for closing the seed furrow; the soil covering device is connected to the lower connecting plate by bolts, and the spring passes through the soil covering device and is connected to the lower connecting plate.

[0010] Furthermore, the suppression device includes a rear rectangular tube, a depth adjusting screw fixed at the center of the rear rectangular tube, a left connecting plate fixed at the left rear side of the rear rectangular tube, a right connecting plate fixed at the right rear side of the rear rectangular tube, and a suppression wheel fixed between the left connecting plate and the right connecting plate.

[0011] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0012] 1. The sowing unit designed by the present invention has a lateral width of 250 mm, which can meet the agronomic requirement of small soybean row spacing during soybean-corn composite planting, solve the sowing operation problem under rotary tillage conditions, and effectively improve the adaptability and passability of the sowing unit.

[0013] 2. The four-bar-rubber roller combined profiling device of the present invention adopts a four-bar mechanism combined with a rubber roller. The rubber roller has a certain hardness in the natural state, which can maintain the stability of the four-bar mechanism structure. It can be deformed after being squeezed. The deformation range determines the profiling range of the four-bar mechanism. It has both flexibility and stability, which can significantly improve the rapid response of the sowing opener to the undulations of the terrain during the composite planting of soybeans and corn, and ensure the consistency of the sowing depth.

[0014] 3. The present invention integrates soil breaking, furrowing, sowing, soil covering and pressing in one. It adopts a sliding knife type furrow opener, which can achieve neat furrow shape, flat furrow bottom and stable depth without disturbing the soil layer, providing a good seed furrow for seed implantation. At the same time, under the joint action of the soil covering device and the pressing device, the implanted seeds are slightly compacted to achieve uniform spatial distribution of seeds and soil (i.e., grain spacing, sowing depth, row spacing), effectively improve the seed germination rate and yield, and greatly improve production efficiency.

[0015] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of a three-dimensional structure of a four-rod-rubber roller combined independent contour seeding unit of the present invention;

[0017] Figure 2 It is a rear view of a three-dimensional structure of a four-rod-rubber roller combined independent contour seeding unit of the present invention;

[0018] Figure 3 It is a diagram of a four-rod-rubber roller combined profiling device;

[0019] Figure 4 It is a profile roller diagram;

[0020] Figure 5 This is a single frame diagram;

[0021] Figure 6 This is a diagram of the seed box fixing seat;

[0022] Figure 7 Diagram of the seeding device

[0023] Figure 8 This is a diagram of a trenching device;

[0024] Fig. 9 This is a diagram of the soil covering device;

[0025] Fig.10 It is a diagram of the suppression device;

[0026] Fig.11 This is a diagram of the fixing plate of the seed meter;

[0027] Fig.12 This is the sprocket tensioner diagram;

[0028] The parts represented by the reference numerals in the figure are as follows:

[0029] 1. Four-rod-rubber roller combined profiling device; 1-1. Front connecting plate; 1-2. Profiling roller; 1-2a. Front profiling wall; 1-2b. Rubber roller; 1-2c. Profiling support rod; 1-2d. Rear profiling wall; 1-2e. Connecting rod; 1-3. Lower connecting rod; 1-4. Bearing; 1-5. Front bearing seat sprocket; 2. Monolithic frame; 2-1. Front positioning plate; 2-2. Side fixing plate; 2-3. Upper crossbeam plate; 2-4. Lower connecting plate; 2-5. Rear rectangular tube; 2-6. Bearing seat sprocket; 3. Seed box and fixed seat; 3-1. Fixed seat horizontal plate; 3-2. Fixed seat vertical plate Plate; 4. Seeding device; 4-1. Seeder; 4-2. Seeder sprocket; 5. Furrowing device; 5-1. Sliding knife furrowing device; 5-2. H-type connecting plate; 6. Soil covering device; 6-1. Soil covering device; 6-1a. Spring hole of soil covering device; 6-1b. Spring hole; 7. Suppression device; 7-1. Depth adjustment screw; 7-2. Rear rectangular tube; 7-3. Left connecting plate; 7-4. Right connecting plate; 7-5. Suppression wheel; 8. Seeder fixing plate; 9. Sprocket tensioner; 9-1. Nylon wheel; 9-2. Nylon wheel fixing plate; 9-2a. Spring hole of tensioner; 9-2b. Spring hole. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "middle", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 , Figure 2 As shown, a four-rod-rubber roller combined independent profiling sowing unit includes a four-rod-rubber roller combined profiling device 1, a unit frame 2 connected to the four-rod-rubber roller combined profiling device 1, a seed box and a fixing seat 3 fixed to the upper end of the unit frame 2, a seeding device fixing plate 8 fixed to the rear side of the unit frame 2, a seeding device 4 fixed on the seeding device fixing plate 8, a furrowing device 5 fixed to the front side of the lower end of the unit frame 2, a soil covering device 6 fixed to the rear side of the lower end of the unit frame 2, a pressing device 7 fixed to the rear side of the unit frame 2, and a sprocket tensioning wheel 9 fixed to the left side of the unit frame 2.

[0036] Combination Figure 3 , Figure 4 As shown, the four-rod-rubber roller combined profiling device 1 comprises a front connecting plate 1-1, a profiling roller 1-2 fixed to a rectangular hole on the front connecting plate 1-1, a lower connecting rod 1-3 fixed to the front connecting plate, a bearing 1-4 fixed to the profiling roller 1-2 and the front connecting plate, and a front bearing seat sprocket 1-5 fixed to the left side of the front connecting plate 1-1. The profiling roller 1-2 comprises a profiling support rod 1-2c fixed to the rectangular hole of the front connecting plate 1-1, a front profiling wall 1-2a and a rear profiling wall 1-2d fixed to the outside of the profiling support rod 1-2c are connected by bolts, and a rubber roller 1-2b is fixed to the four inner corners of the front profiling wall 1-2a and the rear profiling wall 1-2d, a connecting rod 1-2e fixed to the rear profiling wall 1-2d, and a bearing 1-4 is installed in the cylindrical hole behind the connecting rod 1-2e.

[0037] The parallel four-bar profiling mechanism using elastic profiling rollers can significantly improve the rapid response of the sowing opener to the undulations of the terrain during the composite planting of soybean and corn. In order to better realize the profiling function, the rubber roller 1-2b should have a certain amount of elastic compression when initially installed to apply a torque to ensure the stability of the sowing depth. When the connecting rod 1-2e rotates clockwise in the range of 0° to 45°, the deformation of the rubber roller 1-2b gradually increases, and the sliding friction between it and the profiling wall will gradually increase. Increasing the diameter of the rubber roller 1-2b increases the pressure on the profiling wall, and the friction between the profiling wall and the rubber roller 1-2b also increases accordingly. Taking into account the overall structure of the seeder, the layout of the sowing opener and the requirements of the sowing depth, it is determined that the profiling support rod 1-2c is a square steel with a side length of 50mm, and the inner wall distance between the front profiling wall 1-2a and the rear profiling wall 1-2d is a 65mm structural steel. According to the geometric relationship, the space formed by the profiling support rod 1-2c and the profiling wall can be used to install the rubber roller 1-2b, and the minimum diameter of the rubber roller 1-2b without elastic deformation is 22mm. In order to improve the responsiveness of the adaptive profiling mechanism to the undulation of the surface, it is necessary to determine a reasonable diameter range of the rubber roller 1-2b. Based on the spatial relationship between the profiling wall and the profiling support rod 1-2c, a rubber roller 1-2b with a diameter of 22 to 30mm can be installed.

[0038] Combination Figure 5 As shown, the single frame 2 includes a front positioning plate 2-1, a side fixing plate 2-2 fixed to the rear end of the front positioning plate 2-1, an upper cross beam plate 2-3 fixed to the upper end of the front positioning plate 2-1, a lower connecting plate 2-4 fixed to the lower end of the front positioning plate 2-1, and a rear rectangular tube 2-5 fixed to the rear end of the lower connecting plate 2-4. The front end positioning hole of the front positioning plate 2-1 matches the positioning holes of the profiling roller 1-2 and the lower connecting rod 1-3 of the four-rod-rubber roller combined profiling device 1 respectively. The rear end of the front positioning plate 2-1 has reserved connection positioning holes that match the side fixing plate 2-2, the upper cross beam plate 2-3, and the lower connecting plate 2-4 respectively. The upper end of the side fixing plate 2-2 is connected to the front end of the upper cross beam plate 2-3, the lower end of the side fixing plate 2-2 is connected to the front end of the lower connecting plate 2-4, the rear end of the upper cross beam plate 2-3 is connected to the middle and lower end of the rear rectangular tube 2-5, and the rear end of the lower connecting plate 2-4 is connected to the lower end of the rear rectangular tube 2-5. Fig.11 As shown, the seed metering device fixing plate 8 is connected to the side fixing plate 2-2 and the rear rectangular tube 2-5 by bolts.

[0039] Combination Figure 6 As shown, the seed box and the fixed seat 3 include a fixed seat horizontal plate 3-1 and a fixed seat vertical plate 3-2 fixed at the lower end of the fixed seat horizontal plate 3-1. The fixed seat vertical plate 3-2 is matched and bolted with the middle positioning hole of the upper cross beam plate 2-3, and the seed box is matched and bolted with the fixed seat horizontal plate 3-1.

[0040] Combination Figure 7As shown, the seeding device 4 comprises a seeding device 4-1 and a seeding device sprocket 4-2 fixed on a hexagonal shaft at the rear side of the seeding device 4-1. The seeding device 4 is fixed on a seeding device fixing plate 8 and connected by bolts.

[0041] Combination Figure 8 As shown, the furrowing device 5 includes a sliding blade furrowing device 5-1 and an H-shaped connecting plate 5-2 fixed at the rear end of the sliding blade furrowing device 5-1. The H-shaped connecting plate 5-2 matches the lower connecting plate 2-4, and the front end of the H-shaped connecting plate 5-2 is connected to the sliding blade furrowing device 5-1 by bolts, and the sowing hole of the H-shaped connecting plate 5-2 is "wide at the top and narrow at the bottom". The furrowing device 5 is conducive to the neatness of the furrow shape of the seed furrow and does not disturb the soil layer.

[0042] Combination Fig. 9 As shown, the soil covering device 6 includes a soil covering device 6-1. Figure 5 As shown, one end of the spring of the soil covering device is fixed to the soil covering device spring hole 6-1a on the soil covering device 6-1, and the other end of the spring is fixed to the spring hole 6-1b at the rear end of the lower connecting plate.

[0043] Combination Fig.11 As shown, the suppression device 7 includes a rear rectangular tube 7-2, a depth adjustment screw 7-1 fixed at the center of the rear rectangular tube 7-2, a left connecting plate 7-3 fixed at the left rear side of the rear rectangular tube 7-2, a right connecting plate 7-4 fixed at the right rear side of the rear rectangular tube 7-2, and a suppression wheel 7-5 fixed between the left connecting plate 7-3 and the right connecting plate 7-4.

[0044] Combination Fig.12 As shown, the sprocket tensioner 9 includes a nylon wheel fixing plate 9-2 and a nylon wheel 9-1 fixed to the rear end of the nylon wheel fixing plate 9-2. Figure 5 As shown, one end of the spring providing tensioning force is fixed to the spring hole 9-2a at the front end of the nylon wheel fixing plate 9-2, and the other end of the spring is fixed to the spring hole 9-2b on the front positioning plate 2-1.

[0045] The present invention will be further described below in conjunction with the specific operation process of the soybean-corn strip composite planting seeder.

[0046] The present invention provides a sowing unit for soybean and corn sowing operations after rotary tillage. The unit is installed on a sowing machine and can complete the processes of breaking soil, digging furrows, sowing, covering soil and pressing at one time by being pulled by a tractor. During operation, under the combined action of the sowing machine's own gravity and the four-rod-profiling roller, the sliding knife type furrow opener 5-1 cuts off the surface stubble of the box surface, cuts the soil layer to form a gap, and loosens the soil around the gap to form a loose soil belt. When working on the undulating ground, the sowing unit bracket is lifted up or moved downward with the swing of the profiling, and under the elastic deformation of the profiling rubber roller, the sliding knife type furrow opener breaks the stubble and cuts the seam with the undulation of the ground, ensuring the consistency of the cutting depth. Under the traction of the tractor and the elastic force of the contour roller, the soil continues to be cut in the corresponding gap opened by the furrow opener 501, so that the soil rises along the side of the sowing wheel and is thrown to one side, and a seed furrow that is wide at the top and narrow at the bottom is opened. At the same time, the seeding device 4-1 separates and discharges soybean seeds or corn seeds from the seed population, and the seeds fall into the seed furrow after gravity-type under-constrained seeding. The seed furrow is closed under the action of the soil cover 6-1 of the soil covering device 6. Under the weight of the seeder and the suppression device 7 and the suppression wheel 7-5, the closed seed furrow is suppressed. The soil density after the seed furrow is suppressed is similar, and the seed belt sowing depth is stable, completing the whole sowing process.

[0047] When the present invention is in operation, the four-rod-rubber roller combined profiling device 1 causes the height of the furrowing device 5 and the pressing device 7 to change with the terrain. The change of the pressing strength and the sowing depth is achieved by adjusting the diameter of the rubber roller 1-2b of the profiling roller 1-2 and the height of the pressing wheel. When the seeds are in the soil, the tillage layer below the seed belt is compacted, which is conducive to moisture retention; the soil above the seed belt is loose and tightly covered, which is conducive to air and heat supply, meets the requirements of the seed bed environment of upper hollow and lower solid, and is conducive to seed germination and emergence. The four-rod-rubber roller combined independent profiling sowing monomer has a simple structure and a width of 250mm, which meets the agronomic requirements of small soybean row spacing during soybean-corn strip composite planting; the four-rod-rubber roller combined profiling device 1 uses a rubber roller 1-2b to make the monomer react quickly, and the sliding knife furrow opener 5-1 shows a more stable state, realizing the dense planting requirements of small plant spacing during composite planting, and the lightweight sowing monomer has good adaptability.

[0048] The above is an example of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. A four-rod-rubber roller combined independent contour seeding unit, characterized in that: The invention comprises a four-rod-rubber roller combined profiling device (1), a single frame (2), a seeding device (4), a furrowing device (5), a soil covering device (6) and a pressing device (7). The front end of the four-rod-rubber roller combined profiling device (1) is connected to an external walking mechanism, and the rear end is hinged to the single frame (2). The single frame (2) is fixed with the seeding device (4), the furrowing device (5) and the soil covering device (6). The rear end is also fixed with the pressing device (7). The four-rod-rubber roller combined profiling device (1) and the front positioning plate (2-1) of the single frame (2) form a parallelogram four-rod structure, and a rubber roller is arranged in one hinged end of the four-rod-rubber roller combined profiling device (1). The rubber roller is used to limit the profiling range of the four-rod-rubber roller combined profiling device (1). When the pressing device (7) moves on the ground, it can drive the single frame (2) to move up and down as the terrain changes, thereby changing the shape of the four-rod-rubber roller combined profiling device (1).

2. The four-rod-rubber roller combined independent contour seeding unit according to claim 1, characterized in that: The four-rod-rubber roller combined profiling device (1) comprises a front connecting plate (1-1), a lower connecting rod (1-3) and a profiling roller (1-2); two ends of the front connecting plate (1-1) are respectively hinged to one end of the lower connecting rod (1-3) and the profiling roller (1-2); the other ends of the lower connecting rod (1-3) and the profiling roller (1-2) are respectively hinged to a front positioning plate (2-1) of a single frame (2); the hinged ends of the front connecting plate (1-1) and the profiling roller (1-2) comprise two inner and outer nested rectangular frames, the two rectangular frames are respectively one end of the front connecting plate (1-1) and the profiling roller (1-2) and can rotate relative to each other; rubber rollers (1-2b) are horizontally arranged in the gaps at the four corners of the two rectangular frames; the rubber rollers (1-2b) can contact the two rectangular frames in a natural state.

3. The four-rod-rubber roller combined independent contour seeding unit according to claim 2, characterized in that: The single frame (2) comprises a front positioning plate (2-1) for being hinged to a contour roller (1-2) and a lower connecting rod (1-3), an upper crossbeam (2-3) for fixing a seed box, a side fixing plate (2-2) for fixing a seed meter (4-1), a lower connecting plate (2-4) for connecting a furrowing device (5) and a soil covering device (6), and a rear rectangular tube (7-2) for connecting a pressing device (7) to adjust the pressing depth.

4. The four-rod-rubber roller combined independent contour seeding unit according to claim 1, characterized in that: The furrowing device (5) comprises a sliding blade furrow opener (5-1) for furrowing, and an H-shaped connecting plate (5-2) for fixing the furrow opener and having a sowing opening; the sliding blade furrow opener (5-1) and the H-shaped connecting plate (5-2) are positioned by built-in buckles and connected by bolts; the H-shaped connecting plate (5-2) and the lower connecting plate (2-4) are connected by bolts.

5. The four-rod-rubber roller combined independent contour seeding unit according to claim 1, characterized in that: The soil covering device (6) comprises a soil covering device (6-1) for closing the seed furrow; the soil covering device (6-1) is connected to the lower connecting plate (2-4) via bolts, and a spring passes through the soil covering device (6-1) and is connected to the lower connecting plate (2-4).

6. The four-rod-rubber roller combined independent contour seeding unit according to claim 1, characterized in that: The suppressing device (7) comprises a rear rectangular tube (7-2), a depth adjusting screw (7-1) fixed at the center of the rear rectangular tube (7-2), a left connecting plate (7-3) fixed at the left rear side of the rear rectangular tube (7-2), a right connecting plate (7-4) fixed at the right rear side of the rear rectangular tube (7-2), and a suppressing wheel (7-5) fixed between the left connecting plate (7-3) and the right connecting plate (7-4).

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