Negative pressure seeding device

Abstract

The invention belongs to the technical field of seeding equipment, and particularly relates to a negative pressure seeding device. The invention provides a negative pressure seeding device, and aims to solve the problem that in the prior art, a negative pressure generator of a seeding machine rotates relative to a roller, so that a negative pressure hole easily leaks air. A negative pressure seeding device comprises a rack, a material box is arranged on the rack, and a discharge port is formed in the material box; the rack is further provided with a roller, the roller closes the discharging opening, and the roller is rotationally connected to the rack. When the quantitative groove enters a negative pressure seed taking area, the piston is accurately controlled to move through the driving assembly, negative pressure is generated in the sealing box, and it is ensured that seeds can be stably and accurately sucked into the quantitative groove. The negative pressure generator is ingeniously designed in the sealing box in the roller and rotates along with the roller, so that the interference of the external environment is effectively isolated, and the air leakage phenomenon caused by the contact between the negative pressure hole and the external environment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of sowing equipment, and in particular relates to a negative pressure sowing device. Background Art

[0002] A seeding and raising seeder is used for sowing in the process of raising seedlings, and comprises a frame, a conveying mechanism for conveying the seedling tray forward, a row sowing seat is arranged on the frame, a plurality of sowing slides are arranged on the row sowing seat at horizontal intervals, a sowing drum is connected to the frame for horizontal rotation, and a seed container is arranged on the frame on one side of the sowing drum, a plurality of groups of negative pressure hole groups are circumferentially distributed on the outer wall surface of the sowing drum, each negative pressure hole group is composed of a plurality of negative pressure holes corresponding to the upper ports of the sowing slides one by one, the negative pressure holes are driven by a negative pressure blowing mechanism to negatively pressure adsorb a seed at the discharge port of the seed container, and the negative pressure hole blows air just above the upper port of the corresponding sowing slide to release the seed.

[0003] The seeder uses negative pressure blowing mechanism to act on the negative pressure hole to adsorb the seeds, and blows air outward at the upper port of the sowing chute to make the seeds fall into the sowing chute. The seeds in the sowing chute will fall into the grooves of the seedling tray, thereby achieving the purpose of automatic sowing.

[0004] The seed drill in the prior art uses a negative pressure generator to generate negative pressure in the negative pressure hole, and the drum is in a rotating state relative to the negative pressure generator. Therefore, a rotary sealing structure is required to seal between the negative pressure generator and the drum. This sealing method causes the rotary sealing structure to easily leak, and effective seeding cannot be achieved. In addition, the rotary sealing structure is prone to wear, causing the seed drill to require frequent maintenance. Summary of the invention

[0005] The invention provides a negative pressure seeding device, aiming to solve the problem in the prior art that a negative pressure generator of a seeding machine rotates relative to a drum, causing a negative pressure hole to easily leak air.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A negative pressure seeding device comprises a frame, a material box is arranged on the frame, and a material discharge port is arranged on the material box;

[0008] The frame is also provided with a roller, the roller closes the discharge port, and the roller is rotatably connected to the frame;

[0009] The drum is provided with a quantitative groove, and the seeds discharged from the discharge port enter the quantitative groove. A negative pressure generator is provided in the drum, and the negative pressure generator includes a negative pressure chamber, and the negative pressure chamber is communicated with the quantitative groove. The negative pressure generator includes a sealed box provided in the drum, and the negative pressure chamber is located in the sealed box. A piston for controlling the negative pressure chamber to generate negative pressure or positive pressure is also provided in the sealed box;

[0010] The negative pressure generator also includes a driving assembly arranged on the frame to drive the piston to move. During the rotation of the drum, the quantitative groove passes through the negative pressure seeding area, the negative pressure holding area, the positive pressure seeding area and the positive pressure cleaning area in sequence and then enters the negative pressure seeding area again. The discharge port is located in the negative pressure seeding area.

[0011] When the quantitative groove enters the negative pressure seeding area, the driving assembly causes the piston to move in the sealing box, and the quantitative groove generates negative pressure;

[0012] When the quantitative groove enters the negative pressure maintaining area, the driving assembly maintains the quantitative groove in a negative pressure state through the piston;

[0013] When the quantitative groove enters the positive pressure seeding area, the driving assembly causes the piston to move in the sealing box, and the quantitative groove generates positive pressure;

[0014] When the quantitative groove enters the positive pressure cleaning zone, the driving assembly causes the piston to move in the sealing box, and the quantitative groove generates positive pressure.

[0015] A further improved solution: a motor for driving the roller to rotate is arranged on the frame, and the driving assembly further comprises a disc body fixed on the frame, and the disc body drives the piston to move.

[0016] Based on the above technical solution: The disc is a key component that drives the piston to move, and its shape, size and material selection have an important impact on the system performance. By reasonably designing the structure and parameters of the disc, precise control of the piston movement can be achieved, including movement speed, acceleration and stroke. The motor transmits power to the roller through the transmission device, causing the roller to rotate on the frame; at the same time, the disc converts the rotational motion into the linear motion of the piston.

[0017] A further improved solution: a connecting rod is provided on the piston, the connecting rod extends out of the sealing box in a direction away from the quantitative groove, a driving rod is provided at one end of the connecting rod away from the piston, and the driving rod is driven by the disk body.

[0018] Based on the above technical solution: the design of the connecting rod and the driving rod makes the entire power transmission link more compact and reduces the space occupied by the system. At the same time, this design also helps to improve the stability of the system because the connection between the various components is more direct and reliable.

[0019] A further improved solution: the drive rod and the connecting rod are an integrated structure, and the drive rod is perpendicular to the connecting rod, a track groove is provided on the disk body for moving the piston through the drive rod, and a part of the drive rod extends into the track groove.

[0020] Based on the above technical solution: the drive rod and the connecting rod are used as an integral part, which reduces the connection points and potential looseness risks between the parts and improves the compactness and rigidity of the structure. This design makes the overall structure more stable and can withstand greater workloads. The vertical arrangement of the drive rod and the connecting rod not only helps save space, but also helps optimize the power transmission path and reduce energy loss.

[0021] A further improved solution: the track groove includes a seed taking section corresponding to the negative pressure seed taking area, a negative pressure maintaining section corresponding to the negative pressure maintaining area, a seed discharge section corresponding to the positive pressure seed discharge area and a positive pressure maintaining section corresponding to the positive pressure cleaning area, and the seed taking section, the negative pressure maintaining section, the positive pressure seed discharge section and the positive pressure maintaining section are connected end to end.

[0022] Based on the above technical solution: the seed taking section, negative pressure holding section, positive pressure seeding section and positive pressure holding section are connected end to end, so that the whole process from seed adsorption to final discharge is continuous and efficient. Each stage has a clear function and purpose, avoiding unnecessary waiting and stagnation. By setting the negative pressure holding section and the positive pressure holding section, it can be ensured that the seeds will not be blocked or scattered due to unstable airflow during the transmission process, thereby improving the continuity and stability of seeding. The design of the track groove allows for more precise control of the movement speed and position of the seeds. Especially in the seeding section, by adjusting the airflow pressure and direction, it can be ensured that the seeds fall into the designated position at a suitable speed and posture. Since each stage is closely connected and carried out in an orderly manner, the overlap and interlacing of seeds during the seeding process are reduced, and the uniformity and consistency of seeding are improved.

[0023] A further improved solution: the disc bodies are provided at both ends of the driving rod, the track grooves are provided on the disc bodies, and the two ends of the driving rod extend into the corresponding track grooves respectively.

[0024] Based on the above technical solution: the track groove on each disc body provides a precise moving path for the drive rod. By adjusting the shape, size and position of the track groove and other parameters, the moving trajectory of the drive rod can be precisely controlled, and then the movement of the piston can be precisely controlled. Since both ends of the drive rod are guided by the track groove, the precise positioning of the piston during movement can be ensured. This precise positioning helps to reduce errors and waste caused by position deviation.

[0025] A further improved solution: the quantitative grooves are evenly distributed on the roller, there are a plurality of negative pressure generators, the plurality of negative pressure generators are evenly distributed along the circumferential direction of the roller, and the negative pressure cavity in each negative pressure generator is connected to at least two of the quantitative grooves.

[0026] Based on the above technical solution: Since the quantitative slots and negative pressure generators are evenly distributed, the entire device can operate continuously and efficiently. Under the action of each negative pressure generator, multiple quantitative slots can simultaneously or sequentially perform operations such as taking seeds, maintaining negative pressure, and discharging seeds, thereby improving work efficiency. In traditional designs, there may be waiting time due to improper component positions or unreasonable operation sequences. This evenly distributed design can minimize waiting time, allowing the device to make better use of time for operations.

[0027] A further improved solution: the negative pressure chamber is arranged along the axial direction of the drum, and all the quantitative grooves communicated with the same negative pressure chamber are arranged along the axial direction of the drum.

[0028] Based on the above technical solution: the negative pressure chamber is arranged along the axis direction of the drum, so that the negative pressure can be directly and efficiently transmitted to the quantitative slots connected thereto. This direct transmission reduces the loss and interference of the airflow during the transmission process and improves the utilization rate of the negative pressure. Since the quantitative slots are also arranged along the axis direction of the drum and connected to the negative pressure chamber, the negative pressure can act evenly on each quantitative slot, ensuring the consistency and stability of each quantitative slot during the process of taking seeds and maintaining negative pressure.

[0029] A further improved solution: the volume of the quantitative groove is larger than the volume of one seed and smaller than the volume of two seeds.

[0030] Based on the above technical solution: Since the volume of the quantitative slot is designed just right, it can ensure that only one seed can be accommodated at a time. This single-grain control method greatly reduces the phenomenon of multiple seeds or missed seeding, thereby improving the precision and accuracy of seeding. It avoids the situation where multiple seeds enter the quantitative slot at the same time due to factors such as seed volume differences or airflow fluctuations, reducing the errors and waste caused by this. Since the quantitative slot can only accommodate one seed, it can ensure that each seed is effectively utilized, reducing seed waste. Under the action of the negative pressure generator, the airflow is accurately distributed to each quantitative slot to ensure that the seeds can be stably maintained in the slot. This precise airflow distribution reduces airflow waste and improves the overall efficiency of the device.

[0031] A further improved solution: a driving gear is arranged on the output shaft of the motor, a driven gear meshing with the driving gear is arranged on the roller, and the material box is fixed to the frame by screws.

[0032] Based on the above technical solution: the meshing design of the driving gear and the driven gear realizes the efficient transmission of the motor power to the drum. When the motor rotates, the driving gear on the output shaft drives the driven gear on the drum to rotate, thereby driving the drum to work. This transmission method has the advantages of high transmission efficiency, compact structure, and reliable operation. Gear transmission has the characteristics of good stability, which can ensure that the drum maintains a stable speed and power output during operation, and reduce vibration and noise.

[0033] The beneficial effects of the present invention are:

[0034] When the quantitative groove of the present invention enters the negative pressure seed extraction zone, the movement of the piston is precisely controlled by the driving component to generate negative pressure in the sealed box, ensuring that the seeds can be stably and accurately sucked into the quantitative groove. This negative pressure seed extraction method avoids the problem of inaccurate seed extraction caused by air flow fluctuations or unstable negative pressure in traditional methods. In the negative pressure holding area, the position of the piston is precisely controlled to maintain the negative pressure state in the quantitative groove, ensuring that the seeds will not fall or shift due to changes in air pressure during the transmission process, thereby improving the accuracy and stability of sowing. The negative pressure generator is cleverly designed in the sealed box inside the drum and rotates with the drum. This design effectively isolates the interference of the external environment and reduces the air leakage caused by the contact between the negative pressure hole and the external environment.

[0035] Through the reasonable division of negative pressure seeding area, negative pressure holding area, positive pressure seeding area and positive pressure cleaning area, and the precise control of the drive components, the continuous operation of the sowing process is realized. This design reduces waiting time and downtime, and improves the working efficiency of the entire sowing device.

[0036] In the positive pressure cleaning area, the residue in the quantitative tank is quickly discharged and cleaned by positive pressure, preparing for the next sowing. This fast cleaning method not only saves time but also improves the utilization rate of the equipment.

[0037] The structure of the whole device is relatively simple and compact, which reduces the number and complexity of parts and reduces maintenance costs. At the same time, due to the good connection and sealing performance between the components, the number and cost of repairs caused by problems such as air leakage are also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For users of ordinary technology in the field, other related drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 It is a schematic diagram of the internal structure of a negative pressure seeding device of the present invention.

[0040] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0041] Figure 3 It is a schematic diagram of a negative pressure seeding device of the present invention.

[0042] Figure 4 The present invention is a schematic diagram of the distribution of sealing boxes in a negative pressure seeding device within a drum.

[0043] Description of the numbers in the figure:

[0044] 1-frame; 2-material box; 21-discharging port; 3-drum; 31-quantifying slot; 32-negative pressure chamber; 321-sealing box; 323-piston; 324-connecting rod; 325-driving rod; 33-disk body; 331-track slot; 332-seeding section; 333-negative pressure holding section; 334-seeding section; 335-positive pressure holding section. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by users of the present invention without creative work belong to the protection scope of the present invention.

[0046] refer to Figures 1 to 4, a negative pressure seeding device, comprising a frame 1, a material box 2 is arranged on the frame 1, and a discharge port 21 is arranged on the material box 2;

[0047] The frame 1 is also provided with a roller 3, the roller 3 closes the discharge port 21, and the roller 3 is rotatably connected to the frame 1;

[0048] The drum 3 is provided with a quantitative groove 31, and the seeds discharged from the discharge port 21 enter the quantitative groove 31. A negative pressure generator is provided in the drum 3, and the negative pressure generator includes a negative pressure chamber 32, and the negative pressure chamber 32 communicates with the quantitative groove 31. The negative pressure generator includes a sealed box 321 provided in the drum 3, and the negative pressure chamber 32 is located in the sealed box 321. The sealed box 321 is also provided with a piston 323 for controlling the negative pressure chamber 32 to generate negative pressure or positive pressure;

[0049] The negative pressure generator also includes a driving assembly disposed on the frame 1 to drive the piston 323 to move. During the rotation of the drum 3, the quantitative groove 31 sequentially passes through the negative pressure seeding area, the negative pressure holding area, the positive pressure seeding area and the positive pressure cleaning area and then enters the negative pressure seeding area again. The discharge port 21 is located in the negative pressure seeding area.

[0050] When the quantitative groove 31 enters the negative pressure seeding area, the driving assembly causes the piston 323 to move in the sealing box 321, and the quantitative groove 31 generates negative pressure;

[0051] When the quantitative groove 31 enters the negative pressure holding area, the driving assembly maintains the quantitative groove in a negative pressure state through the piston 323;

[0052] When the quantitative groove 31 enters the positive pressure seeding area, the driving assembly causes the piston 323 to move in the sealing box 321, and the quantitative groove 31 generates positive pressure;

[0053] When the quantitative groove 31 enters the positive pressure cleaning area, the driving assembly causes the piston 323 to move in the sealing box 321 , and the quantitative groove 31 generates positive pressure.

[0054] Specifically: the frame 1 is provided with a motor for driving the roller 3 to rotate, and the driving assembly further includes a disc 33 fixed on the frame 1 , and the disc 33 drives the piston 323 to move.

[0055] A support seat may also be provided on the frame 1, and the drum 3 is rotatably connected to the support seat, and the support seat is fixed to the frame 1 by screws.

[0056] refer to Figures 1 to 4, wherein: a connecting rod 324 is provided on the piston 323, and the connecting rod 324 extends out of the sealing box 321 in a direction away from the quantitative groove 31, and a driving rod 325 is provided at one end of the connecting rod 324 away from the piston 323, and the driving rod 325 is driven by the disk body 33.

[0057] The driving rod 325 and the connecting rod 324 are an integral structure, and the driving rod 325 is perpendicular to the connecting rod 324 . A track groove 331 is provided on the disk body 33 for moving the piston 323 through the driving rod 325 , and a part of the driving rod 325 extends into the track groove 331 .

[0058] Specifically, the track groove 331 includes a seeding section 332 corresponding to the negative pressure seeding area, a negative pressure holding section 333 corresponding to the negative pressure holding area, a seeding section 334 corresponding to the positive pressure seeding area, and a positive pressure holding section 335 corresponding to the positive pressure cleaning area. The seeding section 332, the negative pressure holding section 333, the positive pressure seeding section 334, and the positive pressure holding section 335 are connected end to end. The seeding section 332, the negative pressure holding section 333, the positive pressure seeding section 334, and the positive pressure holding section 335 are smoothly transitioned through transition fillets, and the drive rod 325 and the track groove 331 are prevented from getting stuck.

[0059] Specifically, the two ends of the driving rod 325 are both provided with the disc body 33 , the disc body 33 is both provided with the track groove 331 , and the two ends of the driving rod 325 extend into the corresponding track groove 331 , respectively.

[0060] The disc body 33 can be fixed on the frame 1 through a support frame. The disc body 33 and the support frame can be an integrated structure. The support frame can be fixed on the frame 1 through screws.

[0061] Among them: the quantitative grooves 31 are evenly distributed on the roller 3, there are a plurality of negative pressure generators, and the plurality of negative pressure generators are evenly distributed along the circumferential direction of the roller 3, and the negative pressure cavity 32 in each of the negative pressure generators is communicated with at least two of the quantitative grooves 31.

[0062] The negative pressure chamber 32 is arranged along the axial direction of the drum 3 , and all the quantitative grooves 31 communicating with the same negative pressure chamber 32 are arranged along the axial direction of the drum 3 .

[0063] When the quantitative groove 31 is required to take only one seed each time: the volume of the quantitative groove 31 is larger than the volume of one seed and smaller than the volume of two seeds.

[0064] Specifically: a driving gear is arranged on the output shaft of the motor, a driven gear meshing with the driving gear is arranged on the roller 3, and the material box 2 is fixed to the frame 1 by screws.

[0065] A gearbox may also be provided between the motor and the material box 2, that is, the power output by the motor is transmitted to the gearbox for speed change and then transmitted to the drum 3, so that the drum 3 rotates at a reasonable speed.

[0066] The working principle of this embodiment:

[0067] When the quantitative groove 31 enters the negative pressure seeding area, the piston 323 moves downward in the sealed box 321, thereby increasing the volume in the sealed box 321 and generating negative pressure.

[0068] The negative pressure is transmitted to the quantitative groove 31 through the negative pressure chamber 32, and the seeds discharged from the discharge port 21 are sucked into the quantitative groove 31. Since the volume of the quantitative groove 31 is designed to be just right, larger than the volume of one seed and smaller than the volume of two seeds, usually only one seed can be sucked in each time.

[0069] When the quantitative groove 31 carries the seeds into the negative pressure holding area, the piston 323 remains in position or is slightly adjusted to maintain the negative pressure state. Under the negative pressure, the seeds are firmly held in the quantitative groove 31 and will not fall or shift due to the rotation of the drum 3 or air flow fluctuations.

[0070] When the quantitative groove 31 carries the seeds into the positive pressure seeding area, the piston 323 moves in the opposite direction, reducing the volume in the sealed box 321 and generating positive pressure. The positive pressure is transmitted to the quantitative groove 31 through the negative pressure chamber 32, pushing the seeds out of the quantitative groove 31. The seeds fall into the preset position under the action of gravity.

[0071] When the quantitative tank 31 enters the positive pressure cleaning zone without any load, the piston 323 moves to continue to generate positive pressure, and the air flow flushes the interior of the quantitative tank 31 to remove possible residual impurities or excess seeds.

[0072] The cleaned quantitative tank 31 enters the negative pressure seed taking area again to prepare for the next seed taking cycle.

[0073] The present invention is not limited to the above optional implementation modes. Under the premise of not conflicting with each other, the various schemes can be combined arbitrarily. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in their shapes or structures, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. A negative pressure seeding device, characterized in that: It comprises a frame, a material box is arranged on the frame, and a material discharge port is arranged on the material box; The frame is also provided with a roller, the roller closes the discharge port, and the roller is rotatably connected to the frame; The drum is provided with a quantitative groove, and the seeds discharged from the discharge port enter the quantitative groove. A negative pressure generator is provided in the drum, and the negative pressure generator includes a negative pressure chamber, and the negative pressure chamber is communicated with the quantitative groove. The negative pressure generator includes a sealed box provided in the drum, and the negative pressure chamber is located in the sealed box. A piston for controlling the negative pressure chamber to generate negative pressure or positive pressure is also provided in the sealed box; The negative pressure generator also includes a driving assembly arranged on the frame to drive the piston to move. During the rotation of the drum, the quantitative groove passes through the negative pressure seeding area, the negative pressure holding area, the positive pressure seeding area and the positive pressure cleaning area in sequence and then enters the negative pressure seeding area again. The discharge port is located in the negative pressure seeding area. When the quantitative groove enters the negative pressure seeding area, the driving assembly causes the piston to move in the sealing box, and the quantitative groove generates negative pressure; When the quantitative groove enters the negative pressure maintaining area, the driving assembly maintains the quantitative groove in a negative pressure state through the piston; When the quantitative groove enters the positive pressure seeding area, the driving assembly causes the piston to move in the sealing box, and the quantitative groove generates positive pressure; When the quantitative groove enters the positive pressure cleaning zone, the driving assembly causes the piston to move in the sealing box, and the quantitative groove generates positive pressure.

2. A negative pressure seeding device according to claim 1, characterized in that: The frame is provided with a motor for driving the roller to rotate, and the driving assembly further comprises a disc body fixed on the frame, and the disc body drives the piston to move.

3. A negative pressure seeding device according to claim 2, characterized in that: The piston is provided with a connecting rod, and the connecting rod extends out of the sealing box in a direction away from the quantitative groove. A driving rod is provided at one end of the connecting rod away from the piston, and the driving rod is driven by the disc body.

4. A negative pressure seeding device according to claim 3, characterized in that: The driving rod and the connecting rod are of an integrated structure, and the driving rod is perpendicular to the connecting rod. A track groove is provided on the disc body for moving the piston through the driving rod, and a part of the driving rod extends into the track groove.

5. A negative pressure seeding device according to claim 4, characterized in that: The track groove includes a seed taking section corresponding to the negative pressure seed taking area, a negative pressure maintaining section corresponding to the negative pressure maintaining area, a seed discharging section corresponding to the positive pressure seed discharging area and a positive pressure maintaining section corresponding to the positive pressure cleaning area. The seed taking section, the negative pressure maintaining section, the positive pressure seed discharging section and the positive pressure maintaining section are connected end to end.

6. A negative pressure seeding device according to claim 5, characterized in that: The two ends of the driving rod are both provided with the disc body, the disc body is both provided with the track groove, and the two ends of the driving rod extend into the corresponding track groove respectively.

7. A negative pressure seeding device according to claim 6, characterized in that: The quantitative grooves are evenly distributed on the roller, there are a plurality of negative pressure generators, and the negative pressure generators are evenly distributed along the circumferential direction of the roller, and the negative pressure cavity in each negative pressure generator is communicated with at least two of the quantitative grooves.

8. A negative pressure seeding device according to claim 7, characterized in that: The negative pressure chamber is arranged along the axis direction of the drum, and all the quantitative grooves communicated with the same negative pressure chamber are arranged along the axis direction of the drum.

9. A negative pressure seeding device according to claim 1, characterized in that: The volume of the quantitative groove is larger than the volume of one seed and smaller than the volume of two seeds.

10. A negative pressure seeding device according to claim 2, characterized in that: A driving gear is arranged on the output shaft of the motor, a driven gear meshing with the driving gear is arranged on the roller, and the material box is fixed to the frame by screws.

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