Air force needle suction type small particle size sprout seed precision seeding device

Abstract

The utility model relates to a kind of air force needle suction type small-particle sprout seed precision seeding device, including seedling tray conveying device, suction needle type seeding device, air vibrator, air cylinder transmission component, gas supply device and seedling tray stacking device, seedling tray is placed on the seedling tray conveying device, suction needle type seeding device for being used to seed is arranged on the seedling tray conveying device top, air vibrator and air cylinder transmission component are arranged on the suction needle type seeding device, the output end of seedling tray conveying device is provided with seedling tray stacking device, the seedling tray stacking device is used to stack after seeding seedling tray, seedling tray conveying device input end is provided with gas supply device, the output end of gas supply device is respectively connected with the gas inlet of seedling tray seeding device, air vibrator and air cylinder transmission component intercommunication, the utility model is not hurt seed by air force seed metering, strong versatility, applicable to high-speed operation.

Description

Technical Field

[0001] This utility model relates to the field of small-diameter sprout seed sowing technology, specifically a pneumatic needle suction type precision sowing device for small-diameter sprout seeds. Background Technology

[0002] Sprouts, also known as "bean sprouts" or "living vegetables," are a type of vegetable that grows from plant seeds (grain seeds, bean seeds, vegetable seeds, tree seeds, etc.) under dark or low-light conditions, primarily producing edible tender shoots. Sowing is a crucial step in sprout production. Mechanized sowing involves controlling seed transport, spreading the seeds evenly on the culture medium, and related processes such as seed selection, soaking, and germination.

[0003] Currently, high-end sprout sowing is generally done manually by broadcasting. Manual broadcasting has the following disadvantages: 1) High labor intensity: Manual broadcasting requires a lot of physical labor, especially for large-scale planting areas, easily leading to worker fatigue; 2) Low efficiency: Manual broadcasting is slower than mechanical sowing; the larger the sowing area, the longer the time required, affecting production efficiency; 3) Poor uniformity: Manual broadcasting makes it difficult to ensure even seed distribution, easily resulting in uneven seed density, leading to uneven growth of sprouts later, affecting yield and quality; 4) High cost: It requires hiring a large labor force. 5) High labor costs, especially in areas with labor shortages or high labor costs; 6) High management difficulty, as management and monitoring after manual sowing are more difficult, requiring more manpower for maintenance and management, such as pest and disease control and watering, which increases management costs and complexity; 7) Low precision, as it is difficult to achieve precise spacing control in manual sowing, which may affect the germination rate and growth effect of seeds; 8) Poor working environment, in some unfavorable climatic conditions (such as high temperature, low temperature, high humidity, etc.), manual sowing can cause great inconvenience and discomfort to workers, affecting work efficiency and comfort.

[0004] However, the current lack of mechanized sprout sowing equipment makes it difficult to improve sprout productivity, reduce labor costs, and ensure that sowing meets the agronomic requirements of planting. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a pneumatic needle suction type precision sowing device for small-diameter sprout seeds, addressing the above-mentioned shortcomings.

[0006] To solve the above technical problems, the present invention adopts the following technical solution:

[0007] A pneumatic needle-suction precision seeding device for small-diameter sprouts includes a seedling tray conveying device, a needle-suction seeding device, a pneumatic vibrator, a cylinder transmission component, an air supply device, and a seedling tray stacking device. Seedling trays are placed on the seedling tray conveying device. The needle-suction seeding device is positioned above the seedling tray conveying device for sowing seeds onto the seedling trays. The needle-suction seeding device is equipped with a pneumatic vibrator and a cylinder transmission component. The pneumatic vibrator causes the seeds inside the needle-suction seeding device to vibrate, and the cylinder transmission component drives the needle-suction seeding device to reciprocate up and down. The seedling tray stacking device is located at the output end of the seedling tray conveying device for stacking the sown seedling trays. An air supply device is located at the input end of the seedling tray conveying device, and the output end of the air supply device is connected to the air inlets of the needle-suction seeding device, the pneumatic vibrator, and the cylinder transmission component.

[0008] Furthermore, the seedling tray conveying device includes a mounting frame, a belt conveyor line, a belt motor, and a sprocket transmission mechanism. The belt conveyor line is horizontally arranged on the mounting frame, and multiple seedling trays are sequentially placed on the belt conveyor line. A belt motor is arranged on one side of the mounting frame, and the output end of the belt motor is connected to the input end of the belt conveyor line through the sprocket transmission mechanism.

[0009] Furthermore, the needle-type seeding device includes a support, a seed tray, a seed delivery tube, needles, a rotating shaft, and a rocker arm. Supports are provided on both sides of the belt conveyor line, and a fixed frame is provided between two of the supports. Multiple seed delivery tubes are vertically arranged side by side on the fixed frame. The upper end of each seed delivery tube has a semi-circular notch. A seed tray located on one side of the seed delivery tube is horizontally arranged on the fixed frame. The horizontal height of the seed tray is lower than the upper horizontal height of the seed delivery tube. A rotating shaft is horizontally arranged on the side away from the seed delivery tube between the two supports. A rocker arm extending above the seed delivery tube is provided on the rotating shaft. A vacuum chamber is horizontally arranged at the rotating end of the rocker arm. Multiple needles are detachably connected vertically side by side at the bottom of the vacuum chamber. The number of needles is the same as the number of seed delivery tubes. The rotating shaft can rotate the rocker arm to drive the needles to rotate above the seed tray to pick up sprout seeds, and it can also rotate the needles to rotate above the seed delivery tube to deliver sprout seeds to the seed delivery tube.

[0010] Furthermore, all of the suction needles are threadedly connected to the vacuum chamber, and each suction needle is provided with a conical suction hole and a suction needle chamber with a gradually changing cross-section.

[0011] Furthermore, the pneumatic vibrator is installed at the bottom of the seed tray.

[0012] Furthermore, the cylinder transmission component includes a cylinder and a connecting rod. The cylinder is mounted on a side bracket, and the cylinder's telescopic end is hinged to the connecting rod via a hinge joint. The other end of the connecting rod is fixedly connected to a rotating shaft. The cylinder is used to adjust the rotation angle of the rotating shaft via the connecting rod, thereby adjusting the position of the suction needle.

[0013] Furthermore, the seedling tray stacking device includes a stacking frame, electric slide rails, and a tray. Two electric slide rails are vertically and symmetrically arranged on the stacking frame, and the left and right sides of the tray are fixedly connected to the sliders of the two electric slide rails, respectively.

[0014] Furthermore, the output end of the gas supply device is connected to the vacuum chamber via a gas pipe, and the output end of the gas supply device is connected to a vacuum generator via a five-way valve. The vacuum generator is used to convert the positive pressure generated by the gas supply device into negative pressure, and the output end of the vacuum generator is connected to the vacuum chamber via a gas pipe.

[0015] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0016] 1. This invention utilizes an air compressor to provide negative and positive pressure to the needle-type end effector to achieve seed adsorption and release. Since the air compressor outputs positive pressure, a vacuum generator is needed to convert it into negative pressure. The advantages of this positive and negative pressure seeding method are that pneumatic seed dispensing does not damage seeds, it is highly versatile, and suitable for high-speed operations. The air compressor, combined with a pressure sensor and solenoid valve, achieves precise control of the air pressure, ensuring that the adsorption force of the needle on irregularly shaped leaf-like seeds is moderate, preventing seed damage or adsorption failure. By adjusting the air pressure and flow rate, the adsorption needs of various types of sprout seeds can be met for seeds of different shapes and weights.

[0017] 2. This utility model uses a needle-suction end effector for seed suction, innovatively employing an adjustable needle suction adsorption intensity system to adapt to seeds of different sizes, thicknesses, and shapes, avoiding adsorption failure or seed damage. For irregular leaf-shaped seeds, specific needle diameter, orifice shape, and airflow distribution are designed to improve adsorption efficiency and ensure stable seed adsorption. Airflow channels are optimized using airflow dynamics to ensure uniform force on leaf-shaped seeds during adsorption, preventing seed detachment or misalignment due to uneven adsorption. A vibration-assisted function is added to the needle-suction seeding device, adjusting the contact angle between the seed and the needle through slight vibration to improve adsorption efficiency, especially for irregularly shaped or difficult-to-adsorb seeds. A flexible release device is designed, combining gradual reduction of adsorption force with mechanical assistance to gently release seeds into the planting trough, avoiding seed damage or placement deviation due to mechanical impact or improper operation. The needle suction device is innovatively designed as a replaceable module to adapt to the sowing needs of different types, sizes, and shapes of seeds, improving the equipment's versatility and service life.

[0018] 3. This utility model uses an air compressor to supply gas to the cylinder to make the cylinder move, thereby actuating the end effector to reach the seed suction and seeding position. The cylinder control mechanism has a simple structure, is easy to install, has a fast response speed, and is easy to implement; it can accurately control and respond quickly; it is energy-saving and environmentally friendly; it does not require additional lubricant and has the advantages of self-lubrication and maintenance-free operation.

[0019] 4. Traditional static seed trays are prone to seed accumulation, overlap, or blockage, affecting the normal adsorption of the suction needle. By using a pneumatic vibrator to vibrate the seed tray, the seeds maintain a uniform distribution under the combined action of vibration and airflow, thereby improving the efficiency of individual seed separation and ensuring that the suction needle can accurately adsorb individual seeds. The pneumatic vibrator can adjust the vibration frequency, airflow speed, and direction to produce vibrations of different frequencies and amplitudes in the seed tray, adapting to seeds of different shapes, sizes, and densities, such as round, flat, and irregular shapes. Especially for lightweight or difficult-to-separate seeds, such as toon seeds, this mechanism effectively avoids seed accumulation and adhesion. Compared to mechanical stirring or forced separation, the pneumatic vibrating seed tray mechanism minimizes seed damage through the gentle action of airflow and vibration. This method offers better protection for the seed surface, structure, and germination rate. Through vibration and airflow, seeds automatically adjust their posture and distribute themselves within the suction needle area, effectively reducing the probability of repeated or missed suction, thus improving sowing efficiency and accuracy. The combined effect of vibration and airflow reduces seed accumulation when the seed tray is stationary, allowing the suction needles to complete suction and release at a faster pace, suitable for high-speed sowing equipment, thereby significantly improving overall machine efficiency. The dynamic interaction of vibration and airflow allows residual impurities, debris, or unadsorbed seeds to be quickly removed from the seed tray, reducing clogging and cleaning frequency, and improving equipment stability and continuous operation. The pneumatic vibration seed tray mechanism can be combined with sensors and control systems to achieve intelligent adjustment of vibration frequency and airflow intensity, adapting to the characteristics of different seeds and sowing conditions, further improving sowing accuracy and applicability.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 A three-dimensional structural diagram of the seedling tray transfer device;

[0023] Figure 3 Schematic diagram of the three-dimensional structure of the needle-suction seeding device Figure 1 ;

[0024] Figure 4 Schematic diagram of the three-dimensional structure of the needle-suction seeding device Figure 2 (The mounting bracket is omitted);

[0025] Figure 5 A three-dimensional structural diagram of the seedling tray stacking device;

[0026] Figure 6 This is a cross-sectional view of the suction needle.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Seedling tray conveyor; 101. Mounting frame; 102. Belt conveyor line; 103. Belt motor; 104. Chain drive mechanism; 2. Suction needle type seeding device; 201. Support; 202. Seed tray; 203. Seed delivery tube; 204. Suction needle; 205. Rotating shaft; 206. Cradle; 207. Fixing frame; 3. Pneumatic vibrator; 4. Cylinder transmission components; 401. Cylinder; 402. Connecting rod; 5. Air supply device; 6. Seedling tray stacking device; 601. Stacking frame; 602. Electric slide rail; 603. Tray. Detailed Implementation

[0029] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] like Figure 1-6As shown, a pneumatic needle-suction type precision seeding device for small-diameter sprouts includes a seedling tray conveying device 1, a needle-suction seeding device 2, a pneumatic vibrator 3, a cylinder transmission component 4, an air supply device 5, and a seedling tray stacking device 6. Seedling trays are placed on the seedling tray conveying device 1. The needle-suction seeding device 2, used to sow seeds onto the seedling trays, is positioned above the seedling tray conveying device 1. The needle-suction seeding device 2 is equipped with the pneumatic vibrator 3 and the cylinder transmission component 4. The pneumatic vibrator 3 causes the seeds inside the needle-suction seeding device 2 to jump through vibration. The cylinder transmission component 4 drives the needle-suction seeding device 2 to move up and down reciprocally. The seedling tray stacking device 6 is located at the output end of the seedling tray conveying device 1, used to stack the seedling trays after sowing. The air supply device 5 is located at the input end of the seedling tray conveying device 1, and the output end of the air supply device 5 is connected to the air inlet ends of the needle-suction seeding device 2, the pneumatic vibrator 3, and the cylinder transmission component 4, respectively.

[0032] In one embodiment, the seedling tray conveying device 1 includes a mounting frame 101, a belt conveyor line 102, seedling trays, a belt motor 103, and a sprocket transmission mechanism 104. The belt conveyor line 102 is horizontally arranged on the mounting frame 101, and multiple seedling trays are sequentially placed on the horizontal conveyor line. The belt motor 103 is arranged on one side of the mounting frame 101, and the output end of the belt motor 103 is connected to the input end of the belt conveyor line 102 through the sprocket transmission mechanism 104.

[0033] Specifically, the seedling tray conveyor has dimensions of 1000mm × 600mm × 500mm (length × width × height), and the conveyor belt speed ranges from 0 to 193mm / s. It is designed to meet the agronomical requirements of different sprout seed sowing methods. For example, toon seed sowing requires a seed spacing of 1-2mm, and a conveyor belt speed of 0.011-0.022m / s is suitable for this sowing density. The device coordinates with the seedling tray stacking mechanism and the needle-suction sowing mechanism to achieve orderly and evenly spaced sowing. During operation, the conveyor belt is first started, and then the speed is adjusted to a suitable sowing speed using a speed regulator. When the seedling tray 201 is about to reach below the seed delivery tube 203, the needle-suction sowing device 2 starts working. Just as the seeds fall from the seed delivery tube 203 into the seedling tray, the seedling tray reaches below the seed delivery tube 203, and the seeds fall into the seedling tray. The conveyor belt speed is 0.011-0.022m / s.

[0034] In one embodiment, the needle-type seeding device 2 includes a support 201, a seed tray 202, a seed delivery tube 203, a needle 204, a rotating shaft 205, and a cradle 206. Supports 201 are provided on both sides of the belt conveyor 102, and a fixing frame 207 is provided between two supports 201. Multiple seed delivery tubes 203 are vertically arranged side-by-side on the fixing frame 207. The upper end of each seed delivery tube 203 has a semi-circular notch. A seed tray 202 is horizontally arranged on the fixing frame 207, located on one side of the seed delivery tube 203. The horizontal height of the seed tray 202 is lower than the upper horizontal height of the seed delivery tube 203. A rotating shaft 205 is horizontally arranged on the side of the support 201 away from the seed delivery tube 203. A cradle 206 extending above the seed delivery tube 203 is provided on the rotating shaft 205. A vacuum chamber 208 is horizontally arranged at the rotating end of the cradle 206. Multiple suction needles 204 are detachably connected vertically side by side at the bottom of the vacuum chamber 208. The number of suction needles 204 is the same as the number of seed delivery tubes 203. The rotating shaft 205 can rotate the suction needles 204 to the seed tray 202 to pick up sprout seeds by rotating the cradle 206. It can also rotate the suction needles 204 to the seed delivery tube 203 to deliver sprout seeds to the seed delivery tube 203.

[0035] Specifically, the seed delivery tube 203 consists of 33 transparent tubes. The seed delivery tube 203 has an inner diameter of 10mm, an outer diameter of 13mm, and a length of 140mm. A semi-circular notch with a radius of 7.5mm is cut off at one end to prevent the suction needle 204 from interfering with the seed delivery tube 203 during its movement. The 33 needle suction heads are installed on the airflow distribution chamber using a threaded adapter.

[0036] In one embodiment, multiple suction needles 204 are threadedly connected to a vacuum chamber 208, and the suction needles 204 adopt a conical suction hole and a suction needle 204 chamber with a gradually changing cross section.

[0037] Specifically, a complete row of suction needles 204 consists of 33 needles. The needles 204 have a combination of trapezoidal and rectangular structures, with suction holes of 0.6mm, 0.8mm, 1.0mm, and 1.2mm in size. Suction needles 204 with different suction hole sizes are selected according to the shape and size of the seeds and the agronomic requirements of different seed sowing. The suction needles 204 adopt conical suction holes and gradually changing cross-section chambers to improve the stability of the negative pressure flow field distribution gradient for seed suction, enabling precise grasping of different sprout seeds with a seed suction accuracy rate of over 95%.

[0038] In one embodiment, the pneumatic vibrator 3 is installed at the bottom of the seed tray 202.

[0039] Specifically, the pneumatic vibrator 3 has a temperature range of -5 to 60℃, is a GT series model, has a pressure range of 0.2 to 0.6 MPa, and a torque range of 130 to 11150 N.

[0040] In one embodiment, the cylinder transmission component 4 includes a cylinder 401 and a connecting rod 402. The cylinder 401 is mounted on a side bracket 201. The telescopic end of the cylinder 401 is hinged to the connecting rod 402 via a hinge joint. The other end of the connecting rod 402 is fixedly connected to a rotating shaft 205. The cylinder 401 is used to adjust the rotation angle of the rotating shaft 205 via the connecting rod 402, thereby adjusting the position of the suction needle 204.

[0041] Specifically, the swing cylinder 401 operates at a pressure below 0.5 MPa and a thrust of 30 kg. When the swing cylinder 401 extends, it moves the suction needle 204 above the vibrating seed tray 202 to adsorb the seeds. Then, as the cylinder 401 retracts, it moves the suction needle 204 above the seed delivery tube 203. A solenoid valve controls the positive pressure of the air compressor to assist in blowing the seeds, discharging them along the seed delivery tube 203 into the seedling tray.

[0042] In one embodiment, the seedling tray stacking device 6 includes a stacking frame 601, an electric slide rail 602, and a tray 603. Two electric slide rails 602 are vertically and symmetrically arranged on the stacking frame 601. The left and right sides of the tray 603 are fixedly connected to the sliders of the two electric slide rails 602 respectively. The electric slide rails 602 are used to drive the tray 603 to descend by one seedling tray height after the tray 603 receives a seedling tray, waiting for the seedling tray to move down.

[0043] Specifically, the seedling tray stacking device 6 has dimensions of 520mm × 230mm × 588mm (length × width × height), a lead screw accuracy of ±0.05mm, an operating speed of 0.1mm / s-100mm / s, a horizontal load capacity of ≤80kg, and a vertical load capacity of ≤35kg. When a seedling tray is sown, it moves to the stacking machine along the conveyor belt. The initial position of the stacking machine is at the same height as the conveyor belt. When the seedling tray reaches the stacking machine, it is transported onto the stacking machine under the thrust of the conveyor belt. Once all the seedling trays are on the stacking machine, the stacking machine lowers by one tray height to wait for the next tray to be sown, and so on, completing the stacking operation of all seedling trays in sequence.

[0044] In one embodiment, the output end of the gas supply device 5 is connected to the vacuum chamber 208 via a gas pipe. The output end of the gas supply device 5 is connected to a vacuum generator via a five-way valve. The vacuum generator is used to convert the positive pressure generated by the gas supply device 5 into negative pressure. The output end of the vacuum generator is connected to the vacuum chamber 208 via a gas pipe.

[0045] Specifically, the air supply device 5 is an air compressor with a power of 1890w*4, an exhaust volume of 900L / min, and an air tank capacity of 160L; the vibration frequency is 2690~3760Hz, the seed suction negative pressure range is -1200~-900Pa, and the seed feeding positive pressure range is 150~250Pa; the suitable seed suction negative pressure range for Chinese toon, Sichuan pepper, and alfalfa seeds is -1200~-900Pa, and the suitable seed feeding positive pressure is 150~250Pa.

[0046] The working process of this utility model: Taking Chinese toon seeds as an example

[0047] Fill the seed tray 202 with Chinese toon seeds. Before sowing, turn on the vibrator and adjust the frequency. Place the seed tray on the conveyor belt and start the conveyor belt. When the seed tray is about to move directly under the seed delivery tube 203, start the suction needle sowing device 2. Simultaneously start the air compressor. The suction needle sowing device 2 moves to the seed suction position under the power provided by the cylinder 401. The vacuum generator converts the positive pressure generated by the air compressor into negative pressure. After the suction needle 204 picks up the seeds from the seed tray 202, it carries the seeds to the sowing position under the power provided by the cylinder 401. The air compressor starts positive pressure and puts the seeds into the seed tray. In the seed delivery tube 203, the seeds fall into the seedling tray below under their own gravity. To prevent the trajectory of the seeds from changing during the fall, positive pressure blowing is used to assist the stability of the trajectory of the seeds during the fall, so that the seeds can fall into the seed delivery tube 203 and move along the seed delivery tube 203 to the seedling tray, completing the sowing of one row. The second row, the third row, and so on are carried out in sequence. When the sowing of an entire seedling tray is completed, the seedling tray is moved to the palletizer by the conveyor belt. After the first tray is palletized, the palletizer is lowered by one seedling tray height to wait for the next tray to be sown and then palletized.

[0048] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A pneumatic needle suction type precision sowing device for small-diameter sprout seeds, characterized in that, The device includes a seedling tray conveying device (1), a needle-type seeding device (2), a pneumatic vibrator (3), a cylinder transmission component (4), an air supply device (5), and a seedling tray stacking device (6). Seedling trays are placed on the seedling tray conveying device (1). A needle-type seeding device (2) for sowing seeds onto the seedling trays is located above the seedling tray conveying device (1). A pneumatic vibrator (3) and a cylinder transmission component (4) are installed on the needle-type seeding device (2). The pneumatic vibrator (3) is used to vibrate the needle-type seeding device. The seeds inside the seed tray (2) bounce, and the cylinder transmission component (4) is used to drive the needle suction seeding device (2) to move up and down. The output end of the seedling tray transmission device (1) is provided with a seedling tray stacking device (6), which is used to stack the seedling trays after sowing. The input end of the seedling tray transmission device (1) is provided with an air supply device (5), and the output end of the air supply device (5) is connected to the air inlet of the needle suction seeding device (2), the pneumatic vibrator (3), and the cylinder transmission component (4).

2. The pneumatic needle suction type precision sowing device for small-diameter sprout seeds according to claim 1, characterized in that, The seedling tray transmission device (1) includes a mounting frame (101), a belt conveyor (102), a belt motor (103), and a sprocket transmission mechanism (104). The belt conveyor (102) is horizontally arranged on the mounting frame (101), and multiple seedling trays are placed sequentially on the belt conveyor (102). The belt motor (103) is arranged on one side of the mounting frame (101), and the output end of the belt motor (103) is connected to the input end of the belt conveyor (102) through the sprocket transmission mechanism (104).

3. The pneumatic needle suction type precision sowing device for small-diameter sprout seeds according to claim 2, characterized in that, The needle-type seeding device (2) includes a support (201), a seed tray (202), a seed delivery tube (203), a needle (204), a rotating shaft (205), and a cradle (206). Supports (201) are provided on both sides of the belt conveyor (102), and a fixed frame (207) is provided between the two supports (201). Multiple seed delivery tubes (203) are vertically arranged side-by-side on the fixed frame (207). A semi-circular notch is provided at the upper end of each seed delivery tube (203). A seed tray (202) is horizontally arranged on one side of the seed delivery tube (203) on the fixed frame (207). The horizontal height of the seed tray (202) is lower than the upper horizontal height of the seed delivery tube (203). The two supports (201) are connected by a cradle (206). A rotating shaft (205) is horizontally arranged on the side away from the seed delivery tube (203) between 01). A cradle (206) extending to the top of the seed delivery tube (203) is provided on the rotating shaft (205). A vacuum chamber (208) is horizontally arranged at the rotating end of the cradle (206). Multiple suction needles (204) are vertically and detachably connected to the bottom of the vacuum chamber (208). The number of suction needles (204) is the same as the number of seed delivery tubes (203). The rotating shaft (205) can drive the suction needles (204) to rotate above the seed tray (202) to pick up sprout seeds by rotating the cradle (206). It can also rotate the suction needles (204) to the top of the seed delivery tube (203) to transport sprout seeds to the seed delivery tube (203).

4. The pneumatic needle suction type precision sowing device for small-diameter sprout seeds according to claim 3, characterized in that, Multiple suction needles (204) are threadedly connected to a vacuum chamber (208), and each suction needle (204) is provided with a conical suction hole and a suction needle chamber with a gradually changing cross section.

5. The pneumatic needle suction type precision sowing device for small-diameter sprout seeds according to claim 1, characterized in that, The pneumatic vibrator (3) is installed at the bottom of the seed tray (202).

6. The pneumatic needle suction type precision sowing device for small-diameter sprout seeds according to claim 1, characterized in that, The cylinder transmission component (4) includes a cylinder (401) and a connecting rod (402). The cylinder (401) is mounted on a side bracket (201). The extension end of the cylinder (401) is hinged to the connecting rod (402) through a hinge joint. The other end of the connecting rod (402) is fixedly connected to the rotating shaft (205). The cylinder (401) is used to adjust the rotation angle of the rotating shaft (205) through the connecting rod (402), thereby adjusting the position of the suction needle (204).

7. The pneumatic needle suction type precision sowing device for small-diameter sprout seeds according to claim 1, characterized in that, The seedling tray stacking device (6) includes a stacking frame (601), an electric slide rail (602), and a tray (603). Two electric slide rails (602) are vertically and symmetrically arranged on the stacking frame (601). The left and right sides of the tray (603) are fixedly connected to the sliders of the two electric slide rails (602).

8. The pneumatic needle suction type precision sowing device for small-diameter sprout seeds according to claim 1, characterized in that, The output end of the gas supply device (5) is connected to the vacuum chamber (208) through a gas pipe. The output end of the gas supply device (5) is connected to a vacuum generator through a five-way valve. The vacuum generator is used to convert the positive pressure generated by the gas supply device (5) into negative pressure. The output end of the vacuum generator is connected to the vacuum chamber (208) through a gas pipe.

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