Seed injector pipe for seed metering device, seed metering device and seeding device

Abstract

The application discloses a seed injection pipeline for a seed metering device, the seed metering device and a seeding device, wherein the seed injection pipeline is provided with a seed inlet and a seed outlet; the seed injection pipeline comprises a main pipe part and a branch pipe part; the seed outlet is located at one end of the main pipe part, and the other end of the main pipe part is provided with an airflow inlet for entering positive pressure airflow; the main pipe part is provided with a first rough pipe section, a contraction section, a thin pipe section, an expansion section and a second rough pipe section which are sequentially arranged from the airflow inlet; the seed inlet is located at one end of the branch pipe part, and the other end of the branch pipe part is communicated with the thin pipe section; and the branch pipe part is arranged to be inclined relative to the main pipe part. According to the application, on one hand, the reliability of seed metering is improved to avoid seed blocking, and on the other hand, the airflow field pressure difference in the space of the long and narrow circular pipe path is used to form a circumferential wrapping force on the seed, so that the seed is wrapped and restrained, the collision and contact between the seed and the pipe wall are inhibited, the gathering and guiding of the seed caused by trajectory deviation are solved, and the precision of the planting plant distance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural seeding technology, in particular to a seed injection pipeline for a seed metering device, a seed metering device and a seeding device. BACKGROUND

[0002] Seed metering devices play a crucial role in modern agricultural production, as they are one of the core components of seeding machines, directly affecting the quality of crop planting, growth uniformity and final yield. Precise seed discharge ensures that each plant has enough space and resources for healthy growth and increased yield. Efficient seed metering devices can ensure that seeds are accurately planted at the desired spacing and depth, reducing seed waste and adapting to different crop types and field conditions.

[0003] The applicant's prior application CN117223443A provides a typical air pressure type seed metering device, which generates suction force on the suction holes of the seed metering disc by passing air flow to the front side of the seed metering disc, and the seeds adsorbed to the seed metering holes enter the seed metering holes, and the air flow overflowing from the seed metering holes promotes the discharge of the seeds. In this seed metering device, although the air flow can promote the discharge of the seeds, the precision control of the seed metering is poor, and the seeds are prone to collide with the wall of the seed metering pipe, causing collision and displacement. Frequent collisions between the seeds and the pipe wall during the seed discharge process affect the discharge speed and rhythm of the seeds, affecting the plant spacing.

[0004] In the applicant's another prior application CN116326290A, a ring gap injection seed air flow guiding device and method for high-speed precision seeding operation are provided. In this patent, a positive pressure air flow is used to form a negative pressure zone at the seed planting position through a gas suction type precision seed metering device, a blowing seed pipe and a specially designed ring gap injection structure, to realize stable injection and transportation of the seeds, reduce collisions between the seeds and the inner wall of the seed guiding pipe, and cooperate with the seed pressing wheel to ensure accurate positioning of the seeds in the soil, thereby improving the seeding uniformity and quality under high-speed operation. However, the injection structure in this patent is relatively complex, and the processing and assembly are also relatively complex, which increases the use cost. SUMMARY

[0005] The present application provides a seed injection pipeline for a seed metering device, a seed metering device and a seeding device, which can improve the stability of seed metering and reduce the cost.

[0006] Technical scheme: To achieve the above-mentioned purpose, the seed injection pipeline for the seed metering device has a seed inlet and a seed outlet.

[0007] The seed injection pipeline includes a main pipe part and a branch pipe part; the seed outlet is located at one end of the main pipe part, and the other end of the main pipe part is a gas flow inlet for passing positive pressure air flow.

[0008] The main pipe part has a first thick pipe section, a contraction section, a thin pipe section, an expansion section and a second thick pipe section arranged in sequence from the air flow inlet;

[0009] The seed inlet is located at one end of the branch pipe part, and the other end of the branch pipe part communicates with the thin pipe section;

[0010] The branch pipe part is arranged obliquely relative to the main pipe part, so that when the seed enters the main pipe part through the branch pipe part, the movement direction of the seed has a component along the direction of the air flow in the main pipe part.

[0011] Further, the diameter of the first thick pipe section is larger than the diameter of the second thick pipe section.

[0012] Further, the contraction section and the expansion section are both conical.

[0013] Further, the main pipe part further comprises a bend pipe section connecting the second thick pipe section, and the seed outlet is located at the end of the bend pipe section.

[0014] During operation, the positive pressure air flow enters the main pipe part from the air flow inlet. During the process of the air flow from the first thick pipe section to the thin pipe section through the contraction section, the dispersed air flow is gathered due to the decrease of the pipe diameter, the air flow velocity increases, and the flow field pressure decreases. After the air flow from the thin pipe section to the second thick pipe section through the expansion section, the flow velocity slows down, and the flow field pressure increases. Therefore, the air pressure in the thin pipe section is the lowest, so that the negative pressure flow field is generated in the branch pipe part. The negative pressure flow field can suck the seed moving to the seed inlet into the branch pipe part. The seed enters the main pipe part from the branch pipe part, and is finally discharged from the seed outlet and shot into the soil under the thrust action of the air flow field in the main pipe part.

[0015] The cross section of the above-mentioned main pipe part is circular. Due to the characteristics of the air flow field in the long and narrow circular pipe space, i.e. the flow velocity is small and the pressure is large near the pipe wall, and the flow velocity is large and the pressure is small in the center of the pipe, the seed is wrapped, restrained and inhibited, so that the seed moves centrally relative to the main pipe part, the collision of the seed with the pipe wall is prevented, and the consistency of the speed and direction of the ejected seed is improved.

[0016] A seed metering device comprises a housing and a seed metering disc located in the housing, the seed metering disc has a circumferential array of seed suction holes, and further comprises a seed tank for supplying seeds into the housing; a pressure difference between the front and back sides of the seed metering disc enables the seed suction holes to generate suction force; the housing is fixed with the above-mentioned seed ejecting pipe, the branch pipe part of the seed ejecting pipe extends into the housing, and the seed inlet is located on the movement path of the seed suction holes.

[0017] In order to make the air pressure difference between the front and back sides of the seed plate, the first way is to make the front of the shell closed and the back side breathable (that is, the back side has a breathable hole connected to the atmosphere), and the air flow is introduced to the front side of the seed plate. The second way is to make the front of the shell breathable and the back closed, and the air flow is extracted from the back side of the seed plate.

[0018] Further, a roller is rotatably installed in the shell, and the roller is arranged on the back side of the seed plate and aligned with the seed inlet in front and back.

[0019] With the above structure, when the seed plate rotates, each seed suction hole passes through the seed box in turn. Due to the pressure difference between the front and back sides of the seed suction hole, the seed suction hole generates suction force to suck seeds from the seed box and move the seeds to the position of the seed inlet. The roller acts on the back side of the seed suction hole, so that the pressure difference between the two sides of the seed suction hole disappears, the seeds fall from the seed suction hole and are sucked into the branch pipe, and then are discharged from the seed outlet through the main pipe.

[0020] A seeding device comprising the above-mentioned seed plate, further comprising a seed pressing wheel arranged on the back side of the seed outlet. During operation, the seeds discharged from the seed outlet are quickly rolled into the soil under the action of the seed pressing wheel, avoiding the problem of bouncing and misplacement.

[0021] Advantages: The seed plate of the present application has the following advantages:

[0022] (1) Abandoning the simple reliance on the air flow overflowing from the shell of the seed plate to promote seed discharge, through the seed extraction pipe, on the one hand, the reliability of seed discharge is improved to avoid seed blockage, on the other hand, the air flow traction transport effect increases the seed moving speed, realizes the acceleration separation of seeds, expands the distance between adjacent seeds, reduces the time of seeds passing through the seed guide pipe, utilizes the air flow field pressure difference in the narrow and long circular tube path space to form a circumferential wrapping force on the seeds, realizes the wrapping and restraint, suppresses the collision and contact of seeds with the pipe wall, solves the problem of aggregation and seed guiding caused by trajectory deviation, and improves the precision of planting plant spacing.

[0023] (2) The seed extraction pipe structure is integrally formed, which can achieve similar technical effects as in the prior application CN116326290A, but the structure is simple, the production cost is low, and assembly is not required, thereby reducing the use cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Figure 1 is a combination structure diagram of the seed extraction pipe, the seed plate and the roller for the seed plate;

[0025] Figure 2 Figure 2 is a combination structure diagram of the seed extraction pipe and the seed plate;

[0026] Figure 3 Figure 3 is a combination structure diagram of the seed extraction pipe, the seed plate and the roller for the seed plate; Figure 2 Figure 4 is an A-A sectional view structure diagram.

[0027] Figure 4 is a structural diagram of the seed metering device;

[0028] Figure 5 is a structural diagram of the configuration mechanism;

[0029] Figure 6 is a structural diagram of the seed metering device.

[0030] In the figure: 1-main pipe section; 1a-first thick pipe segment; 1b-converging segment; 1c-thin pipe segment; 1d-expanding segment; 1e-second thick pipe segment; 1f-bent pipe segment; 2-branch pipe section; a-seed inlet; b-seed outlet; c-air inlet; 3-housing; 4-seed metering disc; 4a-seed suction hole; 5-seed tank; 6-roller; 7-seed pressing wheel; 8-air pump; 9-configuration mechanism; 91-cylinder; 91a-air hole; 91b-air inlet connecting end; 92-piston; 92a-air outlet connecting end; 93-sleeve; 94-spring. DETAILED DESCRIPTION

[0031] The application will be further described below in conjunction with the drawings.

[0032] As Figure 1 and Figure 2 the seed metering device in the seed metering device seed ejector pipe has a seed inlet a and a seed outlet b;

[0033] The seed ejector pipe includes a main pipe section 1 and a branch pipe section 2; the seed outlet b is located at one end of the main pipe section 1, and the other end of the main pipe section 1 is an air inlet c for entering positive pressure air flow;

[0034] As Figure 3 shown, the main pipe section 1 has a first thick pipe segment 1a, a converging segment 1b, a thin pipe segment 1c, an expanding segment 1d and a second thick pipe segment 1e arranged in sequence from the air inlet c;

[0035] The seed inlet a is located at one end of the branch pipe section 2, and the other end of the branch pipe section 2 communicates with the thin pipe segment 1c;

[0036] The branch pipe section 2 is arranged obliquely relative to the main pipe section 1, so that when the seed enters the main pipe section 1 via the branch pipe section 2, the movement direction of the seed has a component following the direction of the air flow in the main pipe section 1.

[0037] Preferably, the diameter of the first thick pipe segment 1a is larger than the diameter of the second thick pipe segment 1e.

[0038] Preferably, the converging segment 1b and the expanding segment 1d are both conical.

[0039] Preferably, the main pipe section 1 further includes a bent pipe section 1f connecting the second thick pipe section 1e, and the seed outlet b is located at the end of the bent pipe section 1f.

[0040] During operation, positive pressure airflow enters the main pipe section 1 through airflow inlet c. As the airflow travels from the first coarse pipe section 1a through the contraction section 1b into the thin pipe section 1c, the dispersed airflow converges due to the reduced pipe diameter, increasing the airflow velocity and decreasing the flow field pressure. After the airflow travels from the thin pipe section 1c through the expansion section 1d into the second coarse pipe section 1e, the flow velocity slows down and the flow field pressure increases. Therefore, the air pressure in the thin pipe section 1c is the lowest, which generates a negative pressure flow field in the branch pipe section 2. This negative pressure flow field can draw the seeds transported to the seed inlet a into the branch pipe section 2. The seeds enter the main pipe section 1 from the branch pipe section 2 and, under the thrust of the airflow field within the main pipe section 1, are finally discharged from the seed outlet b and injected into the soil.

[0041] The cross-section of the main tube 1 is circular. Due to the characteristics of the airflow field in the narrow circular tube space, the flow velocity is low and the pressure is high near the tube wall, while the flow velocity is high and the pressure is low in the center of the tube. This has the effect of entraining, constraining and inhibiting the seeds, so that the seeds move in the center relative to the main tube 1, preventing the seeds from colliding with the tube wall, and improving the speed and direction consistency of the ejected seeds.

[0042] The present invention also provides a seed metering device, such as Figure 4 As shown, it includes a housing 3 and a seed metering disc 4 located inside the housing 3. The seed metering disc 4 has seed suction holes 4a arranged in a circular array. It also includes a seed box 5 for supplying seeds into the housing 3. There is a pressure difference between the front and back sides of the seed metering disc 4, which enables the seed suction holes 4a to generate an adsorption force. The aforementioned seed ejection pipe is fixed on the housing 3. The branch pipe 2 of the seed ejection pipe extends into the housing 3, and the seed inlet a is placed on the movement path of the seed suction hole 4a.

[0043] To create an air pressure difference between the front and back sides of the seed metering tray 4, the first method is to seal the front of the outer shell 3 while allowing air to pass through the back (i.e., the back side has vents connecting to the atmosphere), thus introducing airflow into the front side of the seed metering tray 4. The second method is to allow air to pass through the front of the outer shell 3 while sealing the back, thus drawing air out from the back side of the seed metering tray 4.

[0044] In this embodiment, the second method described above is used. Air pump 8 is used to draw air from the opposite side of the outer casing 3 and guide the drawn airflow into the airflow inlet c of the seed ejection pipe. Specifically, the air pump 8's suction port is connected to the opposite side of the outer casing 3, and the air pump 8's outlet is connected to a configuration mechanism 9. The configuration mechanism 9 has two air outlet paths, one of which is connected to the airflow inlet c of the seed ejection pipe, and the other is open to the atmosphere.

[0045] like Figure 5As shown, the configuration mechanism 9 comprises a cylinder 91 with a circular channel inside, a piston 92 capable of sliding relative to the circular channel of the cylinder 91, and a sleeve 93 capable of sliding relative to the outer wall of the cylinder 91, the outer wall of the cylinder 91 has a plurality of groups of air holes 91a distributed along the axial direction thereof; the cylinder 91 and the piston 92 are respectively provided with an air inlet connecting end 91b connected to the air pump 8 and an air outlet connecting end 92a connected to the air flow inlet c; a spring 94 is arranged between the piston 92 and the cylinder 91, and the sleeve 93 can move with the piston 92. With the above structure, the stability of the air pressure provided to the air flow inlet c can be maintained; initially, the sleeve 93 blocks the outside of the air holes 91a; when the air flow pressure provided by the air outlet of the air pump 8 is too high, the air pressure drives the piston 92 to move against the elastic force of the spring 94, the piston 92 drives the sleeve 93 to move, the sleeve 93 unblocks a part of the air holes 91a, so that more air holes 91a participate in pressure relief, and the air flow pressure in the cylinder 91 is reduced; when the air flow pressure is reduced, the spring 94 drives the piston 92 to move, the piston 92 drives the sleeve 93 to block a part of the air holes 91a, and the air flow is reduced. In this way, the air pressure stability can be ensured, the seeds can be stably discharged, and the seeding precision is improved.

[0046] Preferably, a roller 6 is rotatably arranged in the housing 3 and located at the back side of the seed sowing disc 4 and aligned with the seed inlet a.

[0047] With the above structure, when the seed sowing disc 4 rotates, each seed suction hole 4a passes through the seed box 5 in sequence, and due to the pressure difference between the front and back sides of the seed suction hole 4a, the seed suction hole 4a generates suction force to suck seeds from the seed box 5 and move the seeds to the position where the seed inlet a is located, the roller 6 acts on the back side of the seed suction hole 4a, so that the pressure difference between the two sides of the seed suction hole 4a disappears, the seeds fall from the seed suction hole 4a and are sucked into the branch pipe part 2, and then are discharged from the seed outlet b through the main pipe part 1.

[0048] Through the above seed ejector pipeline, the conventional mode of simply relying on gravity to guide seeds is abandoned, and the simple air flow in the housing 3 of the seed sowing device is abandoned to promote seed sowing. Through the above seed ejector pipeline, on the one hand, the reliability of seed sowing is improved to avoid seed blockage, and on the other hand, the air flow traction conveying effect increases the seed moving speed, realizes the acceleration separation of seeds, expands the distance between adjacent seeds, reduces the time of seeds passing through the seed guiding pipe, utilizes the air flow field pressure difference in the narrow and long circular tube path space to form a circumferential wrapping force on the seeds, realizes the wrapping constraint, suppresses the collision contact between the seeds and the pipe wall, solves the problem of seed gathering caused by trajectory deviation, and improves the precision of plant spacing.

[0049] The application also provides a seed sowing device, which comprises a seed sowing device as described above. Figure 6As shown, it comprises the seed metering device mentioned above, and further comprises a seed pressing wheel 7 arranged at the rear side of the seed outlet b. During operation, the seeds discharged from the seed outlet b are quickly rolled into the soil under the action of the seed pressing wheel, thereby avoiding the problem of bouncing and displacement.

[0050] The above merely describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A seed metering device, comprising a housing (3) and a seed metering disc (4) in the housing (3), the seed metering disc (4) having a circumferential array of seed suction holes (4a), and a seed tank (5) for supplying seeds into the housing (3); a pressure difference is formed between the front and back sides of the seed metering disc (4); and a seed suction conduit is fixed to the housing (3); the seed suction conduit has a seed inlet (a) and a seed outlet (b); characterized in that: the seed suction conduit comprises a main conduit portion (1) and a branch conduit portion (2); the seed outlet (b) is located at one end of the main conduit portion (1), and the other end of the main conduit portion (1) is a gas flow inlet (c) for a positive pressure gas flow; the main conduit portion (1) has, in sequence from the gas flow inlet (c), a first thick tube segment (1a), a contraction segment (1b), a thin tube segment (1c), an expansion segment (1d), and a second thick tube segment (1e); the seed inlet (a) is located at one end of the branch conduit portion (2), and the other end of the branch conduit portion (2) is in communication with the thin tube segment (1c); the branch conduit portion (2) is arranged obliquely relative to the main conduit portion (1); the branch conduit portion (2) of the seed suction conduit extends into the housing (3), and the seed inlet (a) is located on the movement path of the seed suction holes (4a); the front side of the housing (3) is open to air, and the back side of the housing (3) is closed; an air pump (8) is arranged on the back side of the housing (3) to draw air and guide the drawn air into the gas flow inlet (c) of the seed suction conduit; specifically, the air inlet of the air pump (8) is connected to the back side of the housing (3), and the air outlet of the air pump (8) is connected to a configuration mechanism (9); the configuration mechanism (9) has two air outlet paths, one of which is connected to the gas flow inlet (c) of the seed suction conduit, and the other of which is connected to the atmosphere; the configuration mechanism (9) comprises a cylindrical body (91) having a circular channel therein, a piston (92) capable of sliding relative to the circular channel of the cylindrical body (91), and a sleeve (93) capable of sliding relative to the outer wall of the cylindrical body (91); the outer wall of the cylindrical body (91) has a plurality of groups of gas holes (91a) distributed along the axial direction thereof; the cylindrical body (91) and the piston (92) have an air inlet connection end (91b) connected to the air pump (8) and an air outlet connection end (92a) connected to the gas flow inlet (c), respectively; a spring (94) is arranged between the piston (92) and the cylindrical body (91), and the sleeve (93) is capable of moving with the piston (92); initially, the sleeve (93) blocks the outside of the gas holes (91a); when the air flow pressure provided by the air outlet of the air pump (8) is too high, the air pressure drives the piston (92) to move against the elastic force of the spring (94), the piston (92) drives the sleeve (93) to move, the sleeve (93) unblocks a part of the gas holes (91a), so that more gas holes (91a) participate in pressure relief, and the air flow pressure in the cylindrical body (91) is reduced; when the air flow pressure is reduced, the spring (94) drives the piston (92) to move, the piston (92) drives the sleeve (93) to block a part of the gas holes (91a), thereby reducing the air flow leakage. ​ ​ ​ ​ ​ ​ ​ ​ 2. The seed meter of claim 1, wherein, A roller (6) is rotatably installed in the housing (3), and is placed at the back side of the seed plate (4) and is aligned with the seed inlet (a) front and back.

3. A seeding apparatus characterized by, The seed metering device comprises the seed metering device of claim 1, and further comprises a seed pressing wheel (7) placed at the back side of the seed outlet (b).

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