A seedling cultivation system and a seedling cultivation control method

Abstract

The present invention belongs to the technical field of agricultural seed cultivation, and specifically relates to a seed seedling raising system and a seedling raising control method. The seed seedling raising system includes a housing, and a seedling raising area and a screening area are arranged vertically from top to bottom inside the housing. The screening area includes a screening tank, a feeding port is arranged at the upper part of the screening tank, the screening tank is an inverted frustum-shaped structure, clear water is injected into the screening tank, a placement groove is vertically opened at the bottom of the screening tank, and a lifting component is movably arranged vertically in the placement groove. The lifting component is used to lift the seeds at the bottom of the screening tank vertically to the seedling raising area. A flotation port is arranged below the feeding port, a collection unit is arranged on one side of the flotation port, and a circulation unit is arranged between the screening tank and the collection unit. In the present invention, shriveled seeds can be automatically discharged, and the functions of automatic seed conveying and automatic sowing can be realized, reducing the working intensity and improving the seedling raising efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of agricultural seed cultivation, and specifically relates to a seed breeding system and a seed breeding control method. Background Art [[ID=[]7]]

[0002] The seedling raising of crop seeds starts from harvesting seeds and includes processes such as screening, drying, storage, and breeding. Different processes require different equipment, and all the equipment together constitutes a seed breeding system. The early stage of seed breeding is very crucial. Most seeds need to be stored first after harvesting and then bred in the following year. Therefore, there are high requirements for the storage device used to store seeds, and it is necessary to ensure that the seeds are stored under constant temperature conditions.

[0003] In a Chinese patent application for invention with an application publication number of CN117999994A and an application publication date of May 10, 2024, there is disclosed a temperature-controlled storage device for agricultural seed cultivation, including: a temperature control box, the temperature control box is a square box body, and a door panel for opening and closing the temperature control box is arranged on the temperature control box, and the door panel is communicated with the interior of the box body of the temperature control box; a support frame, the support frame is arranged outside the temperature control box, and the support frame is used for overall reinforcement of the outside of the temperature control box; a temperature control device, the temperature control device is arranged outside the temperature control box, and the temperature control device is communicated with the interior of the temperature control box, and the temperature control device is used for controlling and balancing the internal temperature of the temperature control box; a photovoltaic power generation component, the photovoltaic power generation component is arranged on the top of the support frame, and the photovoltaic power generation component is electrically connected to the temperature control device, and the photovoltaic power generation component is used for generating electricity by using solar energy; a central controller, the central controller is arranged on the temperature control box, and the central controller is electrically connected to the temperature control device and the photovoltaic power generation component respectively; wherein, the photovoltaic power generation component is a double-sided opening and closing structure.

[0004] This storage device can adjust the temperature according to the requirements of storage and breeding. When the stored seeds are taken out for breeding in the following year, the seeds still need to be secondarily screened, and the dried seeds are sown into the cultivation device. The existing screening method is to screen the seeds by the flotation method. Specifically, when screening, the seeds are scattered in water. If the seeds are shriveled, they will float on the water surface. If the seeds are plump, they will sink to the bottom. In this way, high-quality seeds can be screened out, and then the screened seeds are planted and raised. However, the existing seedling raising equipment and screening equipment are mostly scattered, and the seedling raising equipment only has the function of storage and cultivation. After the screening equipment screens the seeds, it is still necessary to manually carry the seeds and scatter them in the seedling raising area of the seedling raising equipment, which has a large workload and low efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a seedling raising system and a seedling raising control method in view of the deficiencies of the prior art. In the present invention, shriveled seeds can be automatically discharged, and the functions of automatic seed conveying and automatic sowing can be realized, reducing the labor intensity and improving the seedling raising efficiency.

[0006] To solve the problems of the prior art, the present invention provides a seedling raising system, including a housing. Inside the housing, a seedling raising area and a screening area are arranged vertically from top to bottom. The screening area includes a screening trough. A feeding port is arranged at the upper part of the screening trough. Seeds to be screened are put into the screening trough from the feeding port. The screening trough is an inverted frustum-shaped structure. Clear water is injected into the screening trough. A placement groove is vertically opened at the bottom of the screening trough. A lifting component is movably arranged in the placement groove along the vertical direction. The lifting component is used to lift the seeds at the bottom of the screening trough to the seedling raising area along the vertical direction. A flotation port is arranged below the feeding port. The flotation port is radially penetrated through the side wall of the screening trough. A collection unit is arranged on one side of the flotation port. The collection unit is used to collect the seeds discharged through the flotation port. A circulation unit is arranged between the screening trough and the collection unit. The circulation unit discharges the filtered clear water at the bottom of the collection unit into the screening trough from below the screening trough. When the circulation unit operates, the water level in the screening trough is higher than the bottom end face of the flotation port.

[0007] Preferably, a plurality of seedling raising bins are uniformly arranged in the seedling raising area along the vertical direction. The seedling raising bins are annular structures. A plurality of radial partition plates are uniformly fixed around the axis of each seedling raising bin at the upper part. The partition plates divide the seedling raising bin into a plurality of placement cavities. The projection of the placement cavity on the horizontal plane is a fan-shaped structure. A seedling raising box adapted to its shape is slidably arranged in the placement cavity along the radial direction of the seedling raising bin.

[0008] Preferably, a closing unit is arranged above the placement groove to prevent plump seeds at the bottom of the screening trough from falling into the placement groove. The closing unit includes a sealing sleeve that moves along the vertical direction. When the sealing sleeve is at the lowest position, the bottom of the sealing sleeve contacts the bottom of the screening trough. The projection of the placement groove on the horizontal plane is located within the projection of the sealing sleeve on the horizontal plane. A first threaded rod is vertically penetrated through the sealing sleeve. The first threaded rod is in threaded cooperation with the sealing sleeve. A first rotary driver for driving the first threaded rod to rotate is arranged at the end of the first threaded rod.

[0009] Preferably, the lifting assembly includes a lifting shell movably arranged in the placing groove along the vertical direction. An opening is formed in the upper part of the lifting shell. A sliding plate is movably arranged in the lifting shell along the vertical direction. When the sliding plate is located at the bottom of the lifting shell, a collecting groove for receiving plump seeds is jointly formed by the upper part of the sliding plate and the lifting shell. A plurality of filtering holes are distributed on both the lifting shell and the sliding plate. A stretching rod is vertically and fixedly arranged at the bottom of the sliding plate. The stretching rod vertically penetrates through the bottom of the lifting shell and is slidably matched with the lifting shell. A gap exists between the bottom of the stretching rod and the bottom of the lifting shell. A spring is vertically arranged in the gap. Two ends of the spring are respectively fixedly connected with the lifting shell and the end of the stretching rod. A traction column is vertically and fixedly arranged at the upper part of the sliding plate. A winding machine is arranged at the upper part of the outer shell. A traction rope is wound in the winding machine. The end of the traction rope is fixedly connected with the traction column.

[0010] Preferably, a sowing unit is arranged in the seedling raising area. The sowing unit includes a lifting plate movably arranged along the vertical direction on one side of the inner ring of the seedling raising bin. Sowing rods are rotatably arranged around the axis of the seedling raising bin at the lower part of the lifting plate. The length direction of the sowing rods is parallel to the radial direction of the seedling raising bin. A rotating unit for driving the sowing rods to rotate is arranged on the lifting plate. A clamping block is movably arranged along the radial direction of the seedling raising bin on one side of the inner ring of the seedling raising bin. A clamping groove is arranged on the side wall of the lifting shell. The clamping block is matched with the clamping groove.

[0011] Preferably, a plurality of sowing positions are uniformly preset along the vertical direction in the seedling raising area. When the lifting plate moves along the vertical direction, the lifting plate stops successively at a plurality of sowing positions from bottom to top.

[0012] Preferably, a second threaded rod is vertically penetrated through the top of the outer shell. A limiting groove is formed on the side wall of the second threaded rod. The second threaded rod is slidably matched with the outer shell along the vertical direction through the limiting groove. The bottom of the second threaded rod is rotatably matched with the upper part of the lifting plate. A distance measuring instrument is vertically arranged on the lifting plate. The detection end of the distance measuring instrument faces vertically upward. A second driven gear is rotatably arranged on the outer shell. The second driven gear is sleeved on the second threaded rod. The second driven gear is in threaded cooperation with the second threaded rod. A second driving gear is meshed with one side of the second driven gear. A third rotating driver for driving the second driving gear to rotate is arranged at the upper end of the second driving gear.

[0013] Preferably, an annular electromagnetic driver is arranged in the screening groove. A pushing rod is arranged along the radial direction of the screening groove at the lower part of the annular electromagnetic driver. The pushing rod rotates in the screening groove around the axis of the screening groove. The height of the pushing rod is the same as the height of the flotation port.

[0014] Preferably, the collecting unit includes a collecting shell fixedly sleeved on the periphery of the screening groove. A filter screen is horizontally and fixedly arranged in the collecting shell. Both the collecting shell and the filter screen are of annular structures. The filter screen divides the collecting shell into an upper cavity and a lower cavity along the vertical direction.

[0015] The present invention also provides a seed seedling control method based on the above-mentioned seed seedling raising system, comprising the following steps:

[0016] S1. Seeds are dropped into a screening trough filled with clean water from a feeding port. Shrunken seeds float on the water surface, while plump seeds sink to the bottom of the screening trough and gather into a placement trough. The plump seeds are received by a lifting assembly located in the placement trough.

[0017] S2. The circulation unit is started synchronously with feeding. The circulation unit injects the clean water at the bottom of the collection unit into the screening tank from the lower part of the screening tank, so that the clean water in the screening tank flows vertically from bottom to top and flows out from the flotation port and finally discharged into the collection unit. The flowing clean water drives the shrunken seeds floating on the water surface to the flotation port and falls into the collection unit. The collection unit intercepts the seeds and the clean water falls to the bottom of the collection unit.

[0018] S3. The lifting component starts after a rated time delay after feeding, and drives the full seeds to rise to the seedling area, and the sowing unit located in the seedling area sows the full seeds in the seedling area.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention sets a screening tank and sets a lifting component at the bottom of the screening tank. At the same time, a collecting unit and a circulating unit are set on one side of the screening tank, so that the seeds falling into the screening tank are first screened by the clean water stored in the screening tank, the shriveled seeds float on the water surface, and the plump seeds fall to the bottom of the screening tank and gather in the placement tank. Under the action of the circulating unit, the clean water in the screening tank is always in a flowing state. The flowing water drives the shriveled seeds floating on the water surface to the flotation port, and the shriveled seeds are discharged from the flotation port into the collecting unit. After the collecting unit intercepts the shriveled seeds, the filtered Clean water falls into the bottom of the collecting unit, and the circulation unit injects the clean water at the bottom of the collecting unit into the screening tank again, so that the shriveled seeds can be automatically discharged, and the seeds entering the placement tank are taken over by the lifting component, which is started according to the rated time to lift the seeds in the vertical direction, so that the seeds are moved from the screening area to the seedling area, thus completing the automatic seed transportation function. At the same time, a sowing unit is provided in the seedling area, and the sowing unit sows the seeds that have risen to the seedling area in the seedling area, thus realizing the automatic sowing function, reducing the work intensity and improving the seedling efficiency;

[0021] 2. By providing a lifting housing, a sliding plate, and a sowing unit, the present invention enables the sliding plate to continuously extrude the seeds in the lifting housing during the sowing process. Meanwhile, the rotation speed of the sowing rod in the sowing unit gradually increases as the seeds are extruded. When the rotation speed is relatively slow, the sowing rod sows the seeds at a position closer to the center of the seedling cultivation chamber. As the rotation speed of the sowing rod gradually rises, the distance the seeds are sown becomes farther. In this way, the seeds can be automatically and evenly sown in the seedling cultivation chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional structural schematic diagram of a seedling cultivation system of the present invention.

[0023] Figure 2 is; Figure 1 an enlarged view of part A in.

[0024] Figure 3 is a sectional structural schematic diagram of the lifting assembly of the seedling cultivation system of the present invention when it is located in the placement groove.

[0025] Figure 4 is Figure 3 an enlarged view of part B in.

[0026] Figure 5 is a side view structural schematic diagram of the lifting assembly of the seedling cultivation system of the present invention when it rises to the seedling cultivation area.

[0027] Figure 6 is Figure 5 a sectional structural schematic diagram of C-C in.

[0028] Figure 7 is a sectional structural schematic diagram of the lifting assembly of the seedling cultivation system of the present invention when it rises to the seedling cultivation area.

[0029] Figure 8 is Figure 7 an enlarged view of part D in.

[0030] Figure 9 is Figure 7 an enlarged view of part E in.

[0031] Figure 10 is a partial three-dimensional structural schematic diagram of the seedling cultivation system of the present invention.

[0032] The reference numerals in the figure are:

[0033] 1. Outer shell; 2. Seedling raising area; 21. Seedling raising bin; 211. Water spraying pipe; 22. Partition board; 23. Seedling raising box; 24. Sowing unit; 241. Lifting plate; 242. Sowing rod; 243. Rotating unit; 2431. Second rotary driver; 2432. First driving gear; 2433. First driven gear; 244. Clamping block; 245. Second threaded rod; 246. Rangefinder; 247. Second driven gear; 248. Second driving gear; 249. Third rotary driver; 3. Screening area; 31. Screening trough; 32. Placing groove; 33. Lifting assembly; 331. Lifting shell; 332. Sliding plate; 333. Traction column; 334. Traction rope; 335. Reel; 336. Extension rod; 337. Spring; 34. Flotation port; 341. Annular electromagnetic driver; 342. Pushing rod; 35. Circulation unit; 351. Circulation pipe; 352. Water pump; 353. Check valve; 36. Collection unit; 361. Collection shell; 362. Filter screen; 37. Sealing unit; 371. Sealing sleeve; 372. First threaded rod; 373. First rotary driver. Detailed implementation mode

[0034] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation modes.

[0035] Refer to Figure 1 and Figures 3 - 5 : A seedling raising system, including an outer shell 1, a seedling raising area 2 and a screening area 3 are arranged vertically from top to bottom in the outer shell 1. The screening area 3 includes a screening trough 31. A feeding port is arranged at the upper part of the screening trough 31. Seeds to be screened are put into the screening trough 31 from the feeding port. The screening trough 31 is an inverted frustum-shaped structure. Clear water is injected into the screening trough 31. A placing groove 32 is vertically opened at the bottom of the screening trough 31. A lifting assembly 33 is movably arranged vertically in the placing groove 32. The lifting assembly 33 is used to lift the seeds at the bottom of the screening trough 31 vertically to the seedling raising area 2. A flotation port 34 is arranged below the feeding port. The flotation port 34 is penetrated through the side wall of the screening trough 31 along the radial direction of the screening trough 31. A collection unit 36 is arranged on one side of the flotation port 34. The collection unit 36 is used to collect the seeds discharged through the flotation port 34. A circulation unit 35 is arranged between the screening trough 31 and the collection unit 36. The circulation unit 35 discharges the filtered clear water at the bottom of the collection unit 36 into the screening trough 31 from below the screening trough 31. When the circulation unit 35 operates, the water level in the screening trough 31 is higher than the bottom end face of the flotation port 34.

[0036] After taking out the stored seeds, first, the seeds are quantitatively put into the screening tank 31. After the seeds enter the screening tank 31 through the feeding port, the shriveled seeds float on the water surface, and the plump seeds sink to the bottom of the screening tank 31. And because the screening tank 31 is an inverted frustum structure, it ensures that the seeds sinking to the bottom of the screening tank 31 can gather to the center of the screening tank 31 under the action of gravity. The placing tank 32 is exactly located at the center of the screening tank 31, and at this time, the lifting assembly 33 is at the bottom of the placing tank 32. The seeds gathered at the center of the screening tank 31 then fall into the placing tank 32 and are received by the lifting assembly 33. In order to enable the seeds floating on the water surface to move to the flotation port 34 and be discharged, a collection unit 36 and a circulation unit 35 are arranged on one side of the flotation port 34. When the circulation unit 35 is stopped, the collection unit 36 always contains water. At this time, the water level in the screening tank 31 is coplanar with the bottom end face of the flotation port 34. After the seeds are put into the screening tank 31, the circulation unit 35 is started. The circulation unit 35 pumps the water stored at the bottom of the collection unit 36 into the screening tank 31. In this way, the water in the screening tank 31 will flow upward from bottom to top in the vertical direction. In this way, the water in the screening tank 31 overflows from the flotation port 34, and the flowing water drives the shriveled seeds floating on the water surface to the flotation port 34. In this way, the shriveled seeds pass through the flotation port 34 and fall into the collection unit 36 under the drive of the water flow. The collection unit 36 intercepts the shriveled seeds, and the water flowing into the collection unit 36 falls to the bottom of the collection unit 36. In this way, the water in the screening tank 31 circulates, enabling the screening tank 31 to discharge the shriveled seeds in time when screening the seeds. After the seeds are quantitatively put into the screening tank 31, the lifting assembly 33 starts to delay according to the rated time. In this way, enough seeds can be received on the lifting assembly 33. The lifting assembly 33 drives the seeds falling into the placing tank 32 to rise, so that the selected plump seeds move vertically to the seedling raising area 2. In this way, the function of automatically transporting the selected seeds is realized. At the same time, a sowing unit 24 is arranged in the seedling raising area 2. The sowing unit 24 sows the seeds rising to the seedling raising area 2 in the seedling raising area 2. In this way, the function of automatic sowing is realized. The present invention integrates screening and seedling raising, and the selected seeds can be transported to the seedling raising station, reducing the labor intensity and improving the work efficiency at the same time.

[0037] Refer to Figure 6 and Figure 7 : A plurality of seedling raising bins 21 are uniformly arranged in the vertical direction in the seedling raising area 2. The seedling raising bins 21 are annular structures. A plurality of radial partition plates 22 are uniformly fixed around the axis of each seedling raising bin 21. The partition plates 22 divide the seedling raising bin 21 into a plurality of placing cavities. The projection of the placing cavity on the horizontal plane is a fan-shaped structure. A seedling raising box 23 adapted to its shape is slidably arranged in the placing cavity along the radial direction of the seedling raising bin 21.

[0038] During the seedling raising process, the staff can directly draw out a single seedling raising box 23 from the placement cavity to observe the seedling raising situation. A water spraying pipe 211 is arranged at the upper part of the seedling raising bin 21. A humidity detector is arranged in each seedling raising box 23. The seedling raising system further includes a controller. The controller controls the water spraying pipe 211 to supply water to the seeds in the seedling raising box 23 in real time according to the humidity detection value feedback by the humidity detector, so as to ensure that there is sufficient water supply during seedling raising.

[0039] Refer to Figure 6 and Figure 7 : A closing unit 37 for preventing the plump seeds at the bottom of the screening slot 31 from falling into the placement slot 32 is arranged above the placement slot 32. The closing unit 37 includes a sealing sleeve 371 that moves vertically. When the sealing sleeve 371 is at the lowest position, the bottom of the sealing sleeve 371 contacts the bottom of the screening slot 31. The projection of the placement slot 32 on the horizontal plane is located within the projection of the sealing sleeve 371 on the horizontal plane. A first threaded rod 372 is vertically penetrated through the sealing sleeve 371. The first threaded rod 372 is in threaded cooperation with the sealing sleeve 371. A first rotary driver 373 for driving the first threaded rod 372 to rotate is arranged at the end of the first threaded rod 372.

[0040] If the closing unit 37 is not provided, after the lifting assembly 33 drives the plump seeds to rise, some seeds that have not fallen into the placement slot 32 in time are still at the bottom of the screening slot 31. In this way, some seeds will fall into the placement slot 32 after the lifting assembly 33 rises. When the lifting assembly 33 descends, the seeds that have fallen into the placement slot 32 will form an obstruction to the lifting assembly 33, not only squeezing the plump seeds and damaging them, but also causing the lifting assembly 33 to fail to reset normally.

[0041] Refer to Figures 6 - 10 : The lifting assembly 33 includes a lifting shell 331 that moves vertically in the placement slot 32. An opening is formed at the upper part of the lifting shell 331. A sliding plate 332 is arranged to move vertically in the lifting shell 331. When the sliding plate 332 is at the bottom of the lifting shell 331, the upper part of the sliding plate 332 and the lifting shell 331 together form a collection slot for receiving plump seeds. A plurality of filter holes are distributed on both the lifting shell 331 and the sliding plate 332. An extension rod 336 is vertically and fixedly arranged at the bottom of the sliding plate 332. The extension rod 336 vertically penetrates through the bottom of the lifting shell 331 and is in sliding cooperation with the lifting shell 331. There is a gap between the bottom of the extension rod 336 and the bottom of the lifting shell 331. A spring 337 is vertically arranged in the gap. The two ends of the spring 337 are respectively fixedly connected to the lifting shell 331 and the end of the extension rod 336. A traction column 333 is vertically and fixedly arranged at the upper part of the sliding plate 332. A winding machine 335 is arranged at the upper part of the outer shell 1. A traction rope 334 is wound in the winding machine 335. The end of the traction rope 334 is fixedly connected to the traction column 333.

[0042] When the coiling machine 335 winds up the towing rope 334, the towing column 333 drives the sliding plate 332 to rise. The sliding plate 332 provides support for the lifting shell 331 through the extension rod 336 and the spring 337, so that the lifting shell 331 rises together with the sliding plate 332, and the shape of the collection tank can be kept unchanged all the time. At the same time, both the sliding plate 332 and the lifting shell 331 are provided with filter holes. During the rising process of the sliding plate 332 and the lifting shell 331, the redundant water in the collection tank can be discharged in time.

[0043] Refer to Figures 7 - 10 : A sowing unit 24 is arranged in the seedling raising area 2. The sowing unit 24 includes a lifting plate 241 that moves vertically along one side of the inner ring of the seedling raising bin 21. A sowing rod 242 is rotatably arranged around the axis of the seedling raising bin 21 at the lower part of the lifting plate 241. The length direction of the sowing rod 242 is parallel to the radial direction of the seedling raising bin 21. A rotating unit 243 for driving the sowing rod 242 to rotate is arranged on the lifting plate 241. A clamping block 244 is arranged to move along the radial direction of the seedling raising bin 21 on one side of the inner ring of the seedling raising bin 21. A clamping groove is arranged on the side wall of the lifting shell 331, and the clamping block 244 cooperates with the clamping groove.

[0044] The rotating unit 243 includes a second rotating driver 2431, a first driving gear 2432 and a first driven gear 2433. The first driven gear 2433 is rotatably arranged at the bottom of the lifting plate 241. There are multiple sowing rods 242, and the multiple sowing rods 242 are uniformly and fixedly arranged at the bottom of the first driven gear 2433 around the axis of the first driven gear 2433. A first driving gear 2432 is meshed with one side of the first driven gear 2433. A second rotating driver 2431 for driving the first driving gear 2432 to rotate is arranged at the upper end of the first driving gear 2432. The second rotating driver 2431 is preferably a servo motor.

[0045] Refer to Figures 1 - 10 : A plurality of sowing positions are uniformly preset vertically in the seedling raising area 2. When the lifting plate 241 moves vertically, the lifting plate 241 stops successively at the plurality of sowing positions from bottom to top.

[0046] Refer to Figure 2 and Figure 8:A second threaded rod 245 is vertically penetrated and arranged at the top of the housing 1. A limiting groove is formed on the side wall of the second threaded rod 245. The second threaded rod 245 is slidably matched with the housing 1 in the vertical direction through the limiting groove. The bottom of the second threaded rod 245 is rotationally matched with the upper part of the lifting plate 241. A distance measuring instrument 246 is vertically arranged on the lifting plate 241, and the detection end of the distance measuring instrument 246 faces vertically upward. A second driven gear 247 is rotatably arranged on the housing 1. The second driven gear 247 is sleeved on the second threaded rod 245, and the second driven gear 247 is in threaded cooperation with the second threaded rod 245. A second driving gear 248 is engaged with one side of the second driven gear 247. A third rotating driver 249 for driving the second driving gear 248 to rotate is arranged at the upper end of the second driving gear 248.

[0047] The third rotating driver 249 is preferably a servo motor. The distance measuring instrument 246 is used to monitor whether the lifting plate 241 moves to the sowing position. Since a plurality of sowing positions are preset in the seedling raising area 2, after the lifting plate 241 reaches the sowing position, the lifting plate 241 stops moving. At this time, the winding machine 335 pulls the sliding plate 332 into the seedling raising area 2 through the traction rope 334. Since the volume of the collection tank is constant, the weight of the plump seeds in the collection tank is constant, and the compression amount of the spring 337 is also constant. Thus, the lifting shell 331 can rise stably and synchronously with the sliding plate 332. A plurality of stop positions are also preset for the position of the lifting shell 331 in the vertical direction. After the lifting shell 331 rises to the stop position and stops, the clamping block 244 clamps the clamping groove, and at this time, the bottom of the sowing rod 242 contacts the upper part of the lifting shell 331. Subsequently, the winding machine 335 continues to operate, and the traction rope 334 drives the sliding plate 332 to continue to rise. The sliding plate 332 gradually lifts the seeds in the lifting shell 331. The rotation speed of the sowing rod 242 gradually increases driven by the rotating unit 243. Thus, when the sowing rod 242 rotates at a low speed, the seeds are sown at a relatively short distance, and after the rotation speed of the sowing rod 242 increases, the seeds are sown at a relatively long distance. Thus, the seeds are evenly sown into the seedling raising bin 21. When the sliding plate 332 rises to the upper end surface of the lifting shell 331, all the seeds in the collection tank are discharged. At this time, the winding machine 335 releases the traction rope 334, and the lifting shell 331 descends and resets to the placement groove 32. The sealing sleeve 371 in the sealing unit 37 rises, so that the plump seeds in the screening tank 31 can smoothly fall into the lifting shell 331. After the lifting shell 331 resets and delays to the rated time, the lifting shell 331 rises again, and so on in a cycle until all the seedling raising bins 21 in the seedling raising area 2 are sown, and then the lifting shell 331 resets to the placement groove 32 and stops moving.

[0048] Refer to Figure 7: A ring-shaped electromagnetic driver 341 is provided in the screening tank 31. A push rod 342 is provided along the radial direction of the screening tank 31 below the ring-shaped electromagnetic driver 341. The push rod 342 rotates in the screening tank 31 around the axis of the screening tank 31. The height of the push rod 342 is the same as the height of the flotation port 34.

[0049] Due to the action of the push rod 342, the liquid level of the screening tank 31 fluctuates, so that the shriveled seeds can smoothly pass through the flotation port 34.

[0050] Refer to Figure 6 and Figure 7 : The collection unit 36 includes a collection shell 361 fixedly sleeved around the periphery of the screening tank 31. A filter screen 362 is horizontally and fixedly arranged in the collection shell 361. Both the collection shell 361 and the filter screen 362 are of ring-shaped structures. The filter screen 362 divides the collection shell 361 into an upper cavity and a lower cavity in the vertical direction.

[0051] The upper cavity is used to place the shriveled seeds, and the lower cavity is used to collect the clear water passing through the filter screen 362. The circulation unit 35 pumps out the water in the lower cavity and discharges it into the screening tank 31. The circulation unit 35 includes a circulation pipe 351 connecting the bottom of the collection shell 361 with the lower part of the screening tank 31. A water pump 352 is arranged on the circulation pipe 351, and a one-way valve 353 is also arranged on the circulation pipe 351. The one-way valve 353 allows the water in the collection shell 361 to flow into the screening tank 31. In this way, when the water pump 352 pumps the water in the collection shell 361 into the screening shell through the circulation pipe 351, the situation of backflow is not likely to occur.

[0052] The present invention also provides a seed seedling raising control method based on the above-mentioned seed seedling raising system, including the following steps:

[0053] S1. Put the seeds into the screening tank 31 filled with clear water from the feeding port. The shriveled seeds float on the water surface, and the plump seeds sink to the lower part of the screening tank 31 and gather and fall into the placement tank 32. The lifting assembly 33 located in the placement tank 32 receives the plump seeds.

[0054] S2. The circulation unit 35 is started synchronously during feeding. The circulation unit 35 injects the clear water at the bottom of the collection unit 36 into the screening tank 31 from the lower part of the screening tank 31, so that the clear water in the screening tank 31 flows upward from bottom to top in the vertical direction and flows out from the flotation port 34, and finally drains into the collection unit 36. The flowing clear water drives the shriveled seeds floating on the water surface to the flotation port 34 and falls into the collection unit 36. The collection unit 36 intercepts the seeds, and the clear water falls to the bottom of the collection unit 36.

[0055] S3. The lifting assembly 33 starts after a rated time delay since the feeding, and drives the plump seeds to rise to the seedling raising area 2, and the sowing unit 24 located in the seedling raising area 2 sows the plump seeds in the seedling raising area 2.

[0056] The working principle of the present invention: After taking out the stored seeds, first, the seeds are quantitatively fed into the screening tank 31. After the seeds enter the screening tank 31 through the feeding port, the shriveled seeds float on the water surface, and the plump seeds sink to the bottom of the screening tank 31. And because the screening tank 31 is an inverted frustum-shaped structure, it is ensured that the seeds sinking to the bottom of the screening tank 31 can gather to the center of the screening tank 31 under the action of gravity. The placement groove 32 is exactly located at the center of the screening tank 31, and at this time the lifting assembly 33 is located at the bottom of the placement groove 32. The seeds gathered at the center of the screening tank 31 then fall into the placement groove 32 and are received by the lifting assembly 33. In order to enable the seeds floating on the water surface to move to the flotation port 34 for discharge, a collection unit 36 and a circulation unit 35 are arranged on one side of the flotation port 34. When the circulation unit 35 is stopped, there is always water in the collection unit 36. At this time, the water level in the screening tank 31 is coplanar with the bottom end face of the flotation port 34. After the seeds are put into the screening tank 31, the circulation unit 35 starts. The circulation unit 35 pumps the water stored at the bottom of the collection unit 36 into the screening tank 31. In this way, the water in the screening tank 31 will flow upward vertically from bottom to top. In this way, the water in the screening tank 31 overflows from the flotation port 34. The flowing water drives the shriveled seeds floating on the water surface to the flotation port 34. In this way, the shriveled seeds pass through the flotation port 34 under the drive of the water flow and fall into the collection unit 36. The collection unit 36 intercepts the shriveled seeds, and the water flowing into the collection unit 36 falls to the bottom of the collection unit 36. In this way, the water in the screening tank 31 circulates, enabling the screening tank 31 to discharge the shriveled seeds in time when screening the seeds. After the seeds are quantitatively fed into the screening tank 31, the lifting assembly 33 starts with a time delay according to the rated time. In this way, enough seeds can be received on the lifting assembly 33. The lifting assembly 33 drives the seeds falling into the placement groove 32 to rise, so that the selected plump seeds move vertically to the seedling raising area 2. In this way, the function of automatically transporting the selected seeds is realized. At the same time, a sowing unit 24 is arranged in the seedling raising area 2. The sowing unit 24 sows the seeds rising to the seedling raising area 2 in the seedling raising area 2. In this way, the function of automatic sowing is realized.

[0057] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A seedling raising system, comprising a housing (1), characterized in that, Inside the housing (1), a seedling raising area (2) and a screening area (3) are arranged vertically from top to bottom. The screening area (3) includes a screening tank (31). A feeding port is provided at the upper part of the screening tank (31). Seeds to be screened are put into the screening tank (31) from the feeding port. The screening tank (31) is of an inverted frustum shape. Clear water is injected into the screening tank (31). A placement groove (32) is vertically opened at the bottom of the screening tank (31). A lifting assembly (33) is movably arranged vertically in the placement groove (32). The lifting assembly (33) is used to lift the seeds at the bottom of the screening tank (31) vertically to the seedling raising area (2). A flotation port (34) is provided below the feeding port. The flotation port (34) is vertically and radially opened through the side wall of the screening tank (31). A collection unit (36) is arranged on one side of the flotation port (34). The collection unit (36) is used to collect the seeds discharged through the flotation port (34). A circulation unit (35) is arranged between the screening tank (31) and the collection unit (36). The circulation unit (35) discharges the filtered clear water at the bottom of the collection unit (36) into the screening tank (31) from below the screening tank (31). When the circulation unit (35) operates, the water level in the screening tank (31) is higher than the bottom end face of the flotation port (34). A plurality of seedling raising bins (21) are uniformly arranged vertically in the seedling raising area (2). The seedling raising bins (21) are of an annular structure. A plurality of radial partition plates (22) are uniformly fixed around the axis of each seedling raising bin (21) at the upper part of each seedling raising bin (21). The partition plates (22) divide the seedling raising bin (21) into a plurality of placement cavities. The projection of the placement cavity on the horizontal plane is of a fan-shaped structure. A seedling raising box (23) adapted to its shape is slidably arranged in the placement cavity along the radial direction of the seedling raising bin (21). A closing unit (37) for preventing the plump seeds at the bottom of the screening tank (31) from falling into the placement groove (32) is arranged above the placement groove (32). The closing unit (37) includes a sealing sleeve (371) that moves vertically. When the sealing sleeve (371) is in the lowest position, the bottom of the sealing sleeve (371) contacts the bottom of the screening tank (31). The projection of the placement groove (32) on the horizontal plane is located within the projection of the sealing sleeve (371) on the horizontal plane. A first threaded rod (372) is vertically penetrated through the sealing sleeve (371). The first threaded rod (372) is in threaded cooperation with the sealing sleeve (371). A first rotary driver (373) for driving the first threaded rod (372) to rotate is arranged at the end of the first threaded rod (372).

2. The seedling raising system according to claim 1, characterized in that The lifting assembly (33) includes a lifting shell (331) movably arranged in the placement groove (32) in the vertical direction. An opening is formed in the upper part of the lifting shell (331). A sliding plate (332) is movably arranged in the lifting shell (331) in the vertical direction. When the sliding plate (332) is located at the bottom of the lifting shell (331), a collecting groove for receiving plump seeds is jointly formed by the upper part of the sliding plate (332) and the lifting shell (331). A stretching rod (336) is vertically and fixedly arranged at the bottom of the sliding plate (332). The stretching rod (336) vertically penetrates through the bottom of the lifting shell (331) and is in sliding fit with the lifting shell (331). There is a gap between the bottom of the stretching rod (336) and the bottom of the lifting shell (331). A spring (337) with two ends respectively fixedly connected to the lifting shell (331) and the stretching rod (336) is vertically arranged in the gap. A winch (335) for driving the lifting shell (331) to lift is arranged in the upper part of the outer shell (1).

3. A seedling raising system according to claim 2, characterized in that, A sowing unit (24) is arranged in the seedling raising area (2). The sowing unit (24) includes a lifting plate (241) movably arranged in the vertical direction on one side of the inner ring of the seedling raising bin (21). A sowing rod (242) is rotatably arranged around the axis of the seedling raising bin (21) at the lower part of the lifting plate (241). A rotating unit (243) for driving the sowing rod (242) to rotate is arranged on the lifting plate (241). A clamping block (244) is movably arranged in the radial direction of the seedling raising bin (21) on one side of the inner ring of the seedling raising bin (21). A clamping groove is arranged on the side wall of the lifting shell (331). The clamping block (244) is matched with the clamping groove.

4. The seedling cultivation system according to claim 3, characterized in that, A plurality of sowing positions are uniformly preset in the vertical direction in the seedling raising area (2). When the lifting plate (241) moves in the vertical direction, the lifting plate (241) stops successively at a plurality of sowing positions from bottom to top.

5. The seedling raising system according to claim 4, wherein, A second threaded rod (245) vertically penetrates through the top of the outer shell (1). A limiting groove is formed on the side wall of the second threaded rod (245). The second threaded rod (245) is in sliding fit with the outer shell (1) in the vertical direction through the limiting groove. The bottom of the second threaded rod (245) is in rotational fit with the upper part of the lifting plate (241). A distance measuring instrument (246) is vertically arranged on the lifting plate (241). The detection end of the distance measuring instrument (246) faces vertically upward. A third rotary driver (249) for driving the second threaded rod (245) to rotate is arranged on one side of the second threaded rod (245).

6. The seedling raising system according to claim 5, characterized in that, An annular electromagnetic driver (341) is arranged in the screening groove (31). A push rod (342) is arranged in the radial direction of the screening groove (31) at the lower part of the annular electromagnetic driver (341). The push rod (342) rotates in the screening groove (31) around the axis of the screening groove (31). The height of the push rod (342) is the same as the height of the flotation port (34).

7. A seedling raising system according to claim 6, characterized in that, The collecting unit (36) comprises a collecting shell (361) fixedly sleeved on the periphery of the screening tank (31), a filter screen (362) being fixedly arranged horizontally in the collecting shell (361), and both the collecting shell (361) and the filter screen (362) are annular structures.

8. A seedling raising control method for a seedling raising system according to any one of claims 3-7, characterized in that The steps include: S1. The seeds are put into a screening tank (31) filled with clean water from a feeding port. The shriveled seeds float on the water surface, and the plump seeds settle to the bottom of the screening tank (31) and gather and fall into the placement tank (32). The plump seeds are received by a lifting assembly (33) located in the placement tank (32); S2, the circulation unit (35) is started synchronously when feeding, and the circulation unit (35) injects the clean water at the bottom of the collection unit (36) into the screening tank (31) from the lower part of the screening tank (31), so that the clean water in the screening tank (31) flows vertically from bottom to top and flows out from the flotation port (34), and finally discharged into the collection unit (36). The flowing clean water drives the shrunken seeds floating on the water surface to the flotation port (34) and falls into the collection unit (36). The collection unit (36) intercepts the seeds, and the clean water falls into the bottom of the collection unit (36); S3, the lifting component (33) starts after a rated time delay after feeding, and drives the full seeds to rise to the seedling raising area (2), and the sowing unit (24) located in the seedling raising area (2) sows the full seeds in the seedling raising area (2).

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