A method for selecting and breeding cold-resistant rice seedlings

Abstract

This invention provides a method for selecting and raising cold-resistant rice seeds, relating to the field of agricultural equipment. The method includes: a cylinder, mounting frames, a washing plate, a first sieve plate, a second sieve plate, an isolation chamber, a screening chamber, an end cap, a water inlet, a sieving mechanism, and a driving mechanism. Two mounting frames are symmetrically installed within the cylinder. The washing plate and the first sieve plate are symmetrically installed within the cylinder via the two mounting frames. The washing plate and the first sieve plate have arc-shaped cross-sections and are arranged in a concentric circle. The second sieve plate is installed within the cylinder, is arc-shaped, and has a diameter larger than that of the first sieve plate. An isolation chamber is formed between the second sieve plate and the inner wall of the cylinder. A screening chamber is formed between the first and second sieve plates. This method enables seed cleaning, allows inferior seeds to float on the water surface, and allows inferior seeds on the water surface to be collected and removed.

Description

Technical Field

[0001] This invention relates to the field of rice seedling technology, specifically to a method for selecting and raising seedlings of cold-resistant rice. Background Technology

[0002] Rice is one of my country's main food crops, and cold resistance is an important indicator of rice's stress resistance, directly affecting its yield and quality in low-temperature regions. With the development of agricultural production towards large-scale and precision farming, the cultivation and promotion of cold-resistant rice has become crucial for improving food security. Seed selection, cleaning, soaking, and breeding are the core pretreatment steps in cold-resistant rice cultivation, and their efficiency and quality directly determine the subsequent seedling survival rate and the cold resistance of the seedlings.

[0003] Current breeding equipment has limited functionality and cannot effectively remove shriveled, low-quality seeds before use, which affects the overall germination rate and wastes breeding resources.

[0004] Based on this, the present invention is proposed. Summary of the Invention

[0005] According to embodiments of the present invention, a method for selecting and raising seedlings of cold-resistant rice is provided. This addresses the problems existing in the background.

[0006] In a first aspect of the present invention, a method for selecting and raising seedlings of cold-resistant rice is provided.

[0007] The seed selection and seedling raising methods for this cold-resistant rice include: Step 1: Select a sufficient amount of rice seeds and clean away any stones or other debris; Step 2: Place the rice seeds into a container, pour clean water into the container, and repeatedly stir the water to soak and wash the rice seeds; after washing, inferior seeds will float to the surface of the water. Step 3: Remove inferior rice seeds by turning over the water surface, and then drain the water; Step 4: Heat the container to bring the rice seeds to a temperature range of 25-32℃; Step 5: Transplant the seeds and cultivate them in an environment of 20-25℃; when the seedlings grow to the 1-3 leaf stage, artificially provide a low temperature environment of 10-15℃.

[0008] Preferably, the method uses seed selection and seedling raising equipment for cold-resistant rice.

[0009] The seed selection and seedling raising equipment for cold-resistant rice includes: a cylinder, a mounting frame, a washing plate, a first sieve plate, a second sieve plate, an isolation chamber, a screening chamber, an end cap, a water inlet, a sieving mechanism, and a drive mechanism; Two mounting brackets are symmetrically installed inside the cylinder. The washing plate and the first screen plate are symmetrically installed inside the cylinder via the two mounting brackets. The washing plate and the first screen plate have arc-shaped cross-sections and are arranged in a concentric circle. The second screen plate is installed inside the cylinder, is arc-shaped, and has a diameter larger than that of the first screen plate. An isolation cavity is formed between the second screen plate and the inner wall of the cylinder. A screening cavity is formed between the first screen plate and the second screen plate. The washing and screening mechanism is installed at the center of the cylinder. The driving mechanism is connected to the washing and screening mechanism. The end cap is screwed onto the opening end of the cylinder. The water inlet is installed on the end cap, and a valve is installed on the water inlet. The drive mechanism is controlled to drive the screening and washing mechanism to swing back and forth. When the sieving mechanism corresponds to the washing plate, it can disturb the water flow on the washing plate by swinging, thus completing the washing of rice seeds; when the sieving mechanism corresponds to the first sieve plate, it can collect inferior seeds and seed coats floating on the water surface by swinging.

[0010] Preferably, the first sieve plate has sieve holes arranged in an array, with a hole diameter greater than 5 mm; The second sieve plate has an array of sieve holes with a diameter of less than 1.6 mm.

[0011] Preferably, it also includes: a slot; There are two slots, which are installed symmetrically inside the cylinder, and the two ends of the second sieve plate are respectively inserted into the two slots.

[0012] Preferably, it also includes: a drain pipe; The drain pipe is installed on the cylinder and communicates with the isolation chamber, and a valve is installed on the drain pipe.

[0013] Preferably, the screening and washing mechanism includes: a central tube, a central trough, a flap plate, a shovel plate, a chute, a screw cylinder, a lead screw, a through groove, a slide rail, a slider, a moving rod, a crossbeam, and a rotating rod; The central tube is rotatably mounted at the center of the cylinder, with both ends extending out from the center of the cylinder and the end cap, respectively. The central groove is mounted in the middle of the central tube. Several flaps are equidistantly mounted on the lower surface of the central groove. A through groove is formed on the central groove. The shovel plate is movably mounted in the through groove and is J-shaped. Two sliding grooves are symmetrically mounted on the lower surface of the central groove and are slidably connected to the shovel plate. The screw barrel is rotatably mounted at one end of the central tube. The lead screw is mounted inside the central tube and threadedly connected to the screw barrel. A slide rail is formed on the lead screw. The slider is mounted on the inner wall of the central tube and slidably connected to the slide rail. The moving rod is mounted at the end of the lead screw away from the screw barrel. The crossbeam is mounted on the shovel plate. Both ends of the rotating rod are rotatably connected to the moving rod and the crossbeam, respectively.

[0014] Preferably, the drive mechanism includes: a fixed base, a reciprocating lead screw, a movable base, a guide rod, a swing rod, a spline, a drive groove, an extension arm, and a second motor; The reciprocating screw is rotatably mounted between two fixed seats; the second motor is mounted on one of the fixed seats and connected to one end of the reciprocating screw; the movable seat is threadedly connected to the reciprocating screw; the guide rod is mounted between the two fixed seats and slidably connected to the movable seat; the spline is mounted on the swing rod, and a keyway is provided at the end of the middle tube away from the end cover, with the spline inserted into the keyway; the drive groove is formed on the swing rod; the extension arm is mounted on the movable seat and extends into the drive groove.

[0015] Preferably, it also includes: a base, a support, a housing, and a heating wire; The bracket is installed on the top of the base and is rotatably connected to the cylinder; the outer shell is installed on the outside of the cylinder; the heating wire is installed inside the outer shell and contacts the outer wall of the cylinder. The heating wire is spirally installed inside the housing.

[0016] Preferably, it further includes: a transmission mechanism; the transmission mechanism includes: a gear ring, a connector, a gear, and a first motor; The gear ring is mounted on the cylinder; the connector is mounted on the base; the gear is rotatably mounted on the connector and meshes with the gear ring; the first motor is mounted on the connector and its output end is connected to the gear.

[0017] One or more technical solutions provided in this application have at least the following technical effects or advantages: 1. The present invention provides a seed selection and seedling raising device for cold-resistant rice. The device uses a second motor to drive a reciprocating screw to rotate. The reciprocating movement of the moving seat and the extension arm causes the swing rod to drive the central tube to swing back and forth. The device then uses a shovel to agitate the washing water, thereby cleaning the seeds.

[0018] 2. The first motor in this invention can drive the gear to rotate the gear ring, thereby causing the cylinder to rotate, causing the washing plate and the first screen plate to flip their positions, thereby moving the seeds to the first screen plate, so that the inferior seeds float on the water surface. Rotating the screw cylinder causes the shovel plate to descend, and the inferior seeds on the water surface can be collected and cleaned by the reciprocating swing of the middle cylinder.

[0019] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0020] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 A schematic diagram of a seed selection and seedling raising device for cold-resistant rice according to an embodiment of the present invention is shown; Figure 2 A perspective view of a seed selection and seedling raising device for cold-resistant rice according to an embodiment of the present invention is shown; Figure 3 An exploded structural diagram of a seed selection and seedling raising device for cold-resistant rice according to an embodiment of the present invention is shown. Figure 4 A front cross-sectional view of the cylinder of a seed selection and seedling raising device for cold-resistant rice according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the screening and washing mechanism of a seed selection and seedling raising device for cold-resistant rice according to an embodiment of the present invention is shown. Figure 6 An exploded view of the screening and washing mechanism of a seed selection and seedling raising device for cold-resistant rice according to an embodiment of the present invention is shown. Figure 7 An enlarged view of section A of a seed selection and seedling raising device for cold-resistant rice according to an embodiment of the present invention is shown; Figure 8 A schematic diagram of the drive mechanism of a seed selection and seedling raising device for cold-resistant rice according to an embodiment of the present invention is shown.

[0021] The attached figures are labeled as follows: 1. Base; 2. Support; 3. Cylinder; 4. Outer shell; 5. Heating wire; 6. Mounting bracket; 7. Washing plate; 8. First screen plate; 9. Second screen plate; 10. Slot; 11. Isolation chamber; 12. Screening chamber; 13. Drain pipe; 14. Gear ring; 15. Connector; 16. Gear; 17. End cap; 18. Water inlet; 19. Screening and washing mechanism; 191. Central pipe; 192. Central tank; 193. Flip plate; 194. Shovel plate; 195. 196. Screw; 197. Lead screw; 198. Through groove; 199. Slide rail; 1910. Slider; 1911. Moving rod; 1912. Crossbeam; 1913. Rotating rod; 20. Drive mechanism; 201. Fixed seat; 202. Reciprocating lead screw; 203. Moving seat; 204. Guide rod; 205. Swing rod; 206. Spline; 207. Drive groove; 208. Extension arm; 209. Second motor; 21. First motor. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0024] Embodiments of the present invention also provide a method for selecting and raising seedlings of cold-resistant rice, comprising: Step 1: Select a sufficient quantity of rice seeds and remove stones and other debris. This step removes impurities such as stones and other particulate matter from the rice, facilitating subsequent cleaning and preventing damage to precision equipment.

[0025] Step Two: Place the rice seeds in a container and pour in clean water. Soak and wash the seeds by repeatedly agitating them. After washing, inferior seeds will float to the surface. This step serves two main purposes: firstly, to clean the seeds, removing pathogenic spores, insect eggs, and larvae attached to the seed coat, reducing the probability of disease and pests after sowing. For some hard seeds, the seed coat softens after soaking, breaking dormancy and promoting germination. Secondly, to remove shriveled, damaged, and moldy inferior seeds, retaining plump and healthy seeds for more uniform seedling emergence.

[0026] Step 3: Remove inferior rice seeds by turning over the water surface and then drain the water. The main purpose of this step is to remove inferior rice seeds. Since inferior rice seeds are relatively light, they can be directly skimmed off by turning over the water surface.

[0027] Step 4: Heat the container to bring the rice seeds to a temperature range of 25-32℃. Many seeds have a natural dormancy period; warm water stimulates the embryo to awaken, transitioning it from a dormant state to a state ready for germination. Warm water penetrates the seed coat more easily than cold water, allowing the seeds to quickly absorb enough moisture, providing a foundation for germination. After soaking in warm water, the seeds germinate faster and more uniformly, with more consistent emergence times, facilitating later management.

[0028] Step 5: Transplant the seeds and cultivate them in an environment of 20-25℃. When the seedlings reach the 1-3 leaf stage, artificially introduce a low-temperature environment of 10-15℃. First, allow them to grow to 1-3 leaves at the optimal temperature of 20-25℃, then harden them off at 10-15℃. This allows the seedlings to gradually adapt to the low temperature, making them less prone to yellowing, wilting, or freezing to death when transplanted to the field and encountering late spring frosts or other cold weather. Seedlings hardened off at low temperatures have thicker cell walls, more stable chlorophyll, and accumulate more stress-resistant substances, resulting in stronger disease resistance and lodging resistance during the later stages of field growth.

[0029] like Figures 1-8 As shown, the above-mentioned method for selecting and raising seedlings of cold-resistant rice uses a special seed selection and seedling raising device for cold-resistant rice. This seed selection and seedling raising device for cold-resistant rice includes: a base 1, a support 2, a cylinder 3, an outer shell 4, a heating wire 5, a mounting frame 6, a washing plate 7, a first sieve plate 8, a second sieve plate 9, a slot 10, an isolation chamber 11, a screening chamber 12, a drain pipe 13, a toothed ring 14, a connector 15, a gear 16, an end cap 17, a water inlet 18, a screening and washing mechanism 19, a drive mechanism 20, and a first motor 21.

[0030] like Figures 1-4As shown, the base 1 serves as the overall support structure for the equipment, possessing excellent strength and stability. The bracket 2 is mounted on the top of the base 1 and rotatably connected to the cylinder 3. The cylinder 3 is a hollow cylindrical structure with one open end. The end cap 17 is screwed onto the open end of the cylinder 3, sealing its internal space. The outer shell 4 is mounted on the outside of the cylinder 3, and the heating wire 5 is spirally mounted inside the outer shell 4, contacting the outer wall of the cylinder 3. Turning on the heating wire 5 allows the internal temperature of the cylinder 3 to rise. A corresponding temperature sensor is also provided to detect the internal temperature, ensuring that the temperature remains within the suitable range for rice germination during the germination and breeding stage. At least two brackets 2 are rotatably connected to either the cylinder 3 or the outer shell 4, ensuring stable support for the cylinder 3. Two mounting brackets 6 are symmetrically installed inside the cylinder 3. The washing plate 7 and the first sieve plate 8 are symmetrically installed inside the cylinder 3 via the two mounting brackets 6. The washing plate 7 and the first sieve plate 8 have arc-shaped cross-sections and are arranged in a concentric circle, forming a complete cylindrical structure. The second sieve plate 9 is installed inside the cylinder 3, is arc-shaped, and has a diameter larger than that of the first sieve plate 8. The first sieve plate 8 has an array of sieve holes with a diameter greater than 5 mm, while the second sieve plate 9 has an array of sieve holes with a diameter less than 1.6 mm. This ensures that rice seeds can pass through the sieve holes on the first sieve plate 8 but cannot pass through the sieve holes on the second sieve plate 9. Two slots 10 are symmetrically installed inside the cylinder 3. The two ends of the second sieve plate 9 are respectively inserted into the two slots 10. The slots 10 limit the movement of the second sieve plate 9, thus ensuring its stability. An isolation cavity 11 is formed between the second sieve plate 9 and the inner wall of the cylinder 3, and a screening cavity 12 is formed between the first sieve plate 8 and the second sieve plate 9. A rubber gasket is provided on the side of the end cap 17 facing the inner cavity of the cylinder 3. After being screwed to the cylinder 3, it fits tightly against the washing plate 7, the first sieve plate 8, and the second sieve plate 9, forming a good sealing structure through the rubber gasket, thus ensuring that the isolation cavity 11 and the screening cavity 12 are independent spaces. A drain pipe 13 is installed on the cylinder 3 and communicates with the isolation cavity 11. A valve is installed on the drain pipe 13; this valve is a commonly available electric valve that can control the opening or closing of the drain pipe 13 as needed. The drain pipe 13 is used to drain the liquid inside the cylinder 3. A gear ring 14 is installed on the cylinder 3, and a connecting piece 15 is installed on the base 1. A gear 16 is rotatably installed on the connecting piece 15 and meshes with the gear ring 14. The rotation of the gear 16 drives the gear ring 14 to rotate, thereby causing the cylinder 3 to rotate together. The first motor 21 is mounted on the connector 15, and its output end is connected to the gear 16. Turning on the first motor 21 drives the gear 16 to rotate. The aforementioned gear ring 14, connector 15, gear 16, and first motor 21 constitute a rotational transmission mechanism for driving the cylinder 3 to rotate. The water inlet 18 is mounted on the end cover 17, and a valve is installed on the water inlet 18. The water inlet 18 is located inside the cylindrical structure formed by the washing plate 7 and the first screen plate 8, allowing water to be injected into it.The sieving and washing mechanism 19 is installed at the center of the cylinder 3. The drive mechanism 20 is connected to the sieving and washing mechanism 19. The drive mechanism 20 is controlled to drive the sieving and washing mechanism 19 to swing back and forth. When the sieving and washing mechanism 19 corresponds to the washing plate 7, it can disturb the water flow on the washing plate 7 by swinging, thus completing the washing of rice seeds. When the sieving and washing mechanism 19 corresponds to the first sieve plate 8, it can collect inferior seeds and seed coats floating on the water surface by swinging.

[0031] like Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the screening and washing mechanism 19 includes: a central tube 191, a central trough 192, a flap 193, a shovel 194, a chute 195, a screw barrel 196, a lead screw 197, a through groove 198, a slide rail 199, a slider 1910, a moving rod 1911, a crossbeam 1912, and a rotating rod 1913. The central tube 191 is rotatably installed at the center of the cylinder 3, and both ends extend rotatably from the center of the cylinder 3 and the end cap 17, respectively. The central tube 191 has a hollow structure. The central trough 192 is installed in the middle of the central tube 191. There are several flaps 193, which are equidistantly installed on the lower surface of the central trough 192. The surface of the flaps 193 has holes with a diameter greater than 5mm. When the flaps 193 swing, the seeds will not be blocked and can pass through smoothly. A through groove 198 is formed on the middle groove 192. A shovel plate 194 is installed in the through groove 198 and can move up and down. The shovel plate 194 is J-shaped and has holes with a diameter of less than 1.6 mm on its surface, which can effectively block seeds from passing through. There are two sliding grooves 195, which are symmetrically installed on the lower surface of the middle groove 192 and are slidably connected to the portion perpendicular to the shovel plate 194. The shovel plate 194 can be limited by the sliding grooves 195 to ensure stability when moving up and down. A screw barrel 196 is rotatably installed at one end of the middle tube 191 and has internal threads on its inner wall. A lead screw 197 is installed in the middle tube 191 and is connected to the internal thread of the screw barrel 196. Rotating the screw barrel 196 can drive the lead screw 197 to move along its axial direction. A slide rail 199 is axially formed on the lead screw 197. A slider 1910 is mounted on the inner wall of the central tube 191 and is slidably connected to the slide rail 199. The cooperation between the slide rail 199 and the slider 1910 ensures the stable movement of the lead screw 197 and prevents it from rotating. A moving rod 1911 is mounted on the end of the lead screw 197 away from the screw cylinder 196. A crossbeam 1912 is mounted on the shovel plate 194. The two ends of a rotating rod 1913 are rotatably connected to the moving rod 1911 and the crossbeam 1912, respectively. When the moving rod 1911 moves axially, the rotation of the rotating rod 1913 drives the shovel plate 194 to move upward or downward.

[0032] refer to Figure 1 , Figure 3 and Figure 8As shown, the drive mechanism 20 includes: a fixed base 201, a reciprocating screw 202, a movable base 203, a guide rod 204, a swing rod 205, a spline 206, a drive groove 207, an extension arm 208, and a second motor 209. There are two fixed bases 201, symmetrically mounted on the top of the base 1. The reciprocating screw 202 is rotatably mounted between the two fixed bases 201. The second motor 209 is mounted on one of the fixed bases 201 and connected to one end of the reciprocating screw 202. The movable base 203 is threadedly connected to the reciprocating screw 202. The reciprocating screw 202 is an existing device with reciprocating threads on its surface. The movable base 203 has a slider that mates with the reciprocating threads. When the reciprocating screw 202 rotates, it drives the movable base 203 to move reciprocally. A guide rod 204 is installed between two fixed seats 201 and slidably connected to a movable seat 203. The guide rod 204 limits the movement of the movable seat 203, ensuring that the movable seat 203 can move stably along the axial direction of the reciprocating screw 202 and preventing rotation. A spline 206 is installed on the swing rod 205. A keyway is provided at the end of the middle tube 191 away from the end cover 17. The spline 206 is inserted into the keyway. When the swing rod 205 swings, the spline 206 and the keyway work together to ensure that the middle tube 191 swings synchronously. A drive groove 207 is formed on the swing rod 205. An extension arm 208 is installed on the movable seat 203 and extends into the drive groove 207. When the movable seat 203 moves, the extension arm 208 and the drive groove 207 work together to make the swing rod 205 swing.

[0033] In practical applications, the method of raising seedlings using seed selection and seedling raising equipment for cold-resistant rice includes the following steps: Step 1: Select a sufficient amount of rice seeds and clean and remove stones and other debris; send the cleaned seeds into the cylinder 3 and place them on the washing plate 7; then install the screening and washing mechanism 19, connect the keyway with the spline 206, and install the end cover 17.

[0034] Step 2: Inject water into the cylinder 3 through the water inlet 18, and control the water level to one-quarter of the height of the inner cavity of the cylinder 3; turn on the second motor 209 to make the reciprocating screw 202 rotate, which in turn drives the moving seat 203 to move back and forth; using the cooperation of the extension arm 208 and the drive groove 207, the swing rod 205 swings back and forth, which drives the middle tube 191 to rotate back and forth, and then the water in the cylinder 3 is stirred by the flap 193 to clean the seeds on the washing plate 7.

[0035] Step 3: Turn on the first motor 21, so that the gear 16 drives the gear ring 14 to rotate, and rotate the cylinder 3 by 180° so that the first sieve plate 8 is at the bottom; add an appropriate amount of water into the cylinder 3 so that the liquid level exceeds the first sieve plate 8; use the flip plate 193 to turn the seeds in the water, and during this process, inferior seeds will gradually float to the surface.

[0036] Step 4: Pause the swing of the central tube 191; rotate the screw 196 to move the lead screw 197 axially, and move the moving rod 1911 synchronously, thereby driving the rotating rod 1913 to rotate and drive the shovel plate 194 to descend; then restart the swing of the central tube 191. When the central tube 191 drives the shovel plate 194 to sweep across the water surface in a circular direction and leave the water surface, the inferior seeds floating on the water surface can be collected in the curved part of the shovel plate 194.

[0037] Step 5: Open the drain pipe 13 to drain the water, and the qualified seeds will remain in the screening chamber 12; after disassembling the screening and washing mechanism 19, close the end cover 17 again; turn on the heating wire 5 to control the internal temperature of the cylinder 3 at 25-32℃ and start the breeding operation; during the breeding period, water can be added to the cylinder 3 to keep the water level in the isolation chamber 11, and avoid submerging the seeds while ensuring the ambient humidity.

[0038] Step 6: After the seeds germinate, open the end cap 17, take out the second sieve plate 9, transplant the germinated seeds on it, and cultivate them in an environment of 20-25℃; when the seedlings grow to the 1-3 leaf stage, artificially provide a low temperature environment of 10-15℃ to force the rice to activate cold-resistant genes and improve its frost resistance.

[0039] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for selecting and raising seedlings of cold-resistant rice, characterized in that, include: Step 1: Select a sufficient amount of rice seeds and clean away any stones or other debris; Step 2: Place the rice seeds into a container, pour clean water into the container, and repeatedly stir the water to soak and wash the rice seeds; after washing, inferior seeds will float to the surface of the water. Step 3: Remove inferior rice seeds by turning over the water surface, and then drain the water; Step 4: Heat the container to bring the rice seeds to a temperature range of 25-32℃; Step 5: Transplant the seeds and cultivate them in an environment of 20-25℃; when the seedlings grow to the 1-3 leaf stage, artificially provide a low temperature environment of 10-15℃.

2. The method for selecting and raising seedlings of cold-resistant rice according to claim 1, characterized in that, The seed selection and seedling raising equipment for cold-resistant rice includes: a cylinder (3), a mounting frame (6), a washing plate (7), a first sieve plate (8), a second sieve plate (9), an isolation chamber (11), a screening chamber (12), an end cap (17), a water inlet (18), a sieve washing mechanism (19), and a drive mechanism (20). There are two mounting brackets (6), which are symmetrically installed inside the cylinder (3); the washing plate (7) and the first screen plate (8) are symmetrically installed inside the cylinder (3) through the two mounting brackets (6), and the cross sections of the washing plate (7) and the first screen plate (8) are arc-shaped and are arranged in a circle; the second screen plate (9) is installed inside the cylinder (3), is arc-shaped, and has a diameter larger than that of the first screen plate (8); an isolation cavity (11) is formed between the second screen plate (9) and the inner wall of the cylinder (3); a screening cavity (12) is formed between the first screen plate (8) and the second screen plate (9); the screening and washing mechanism (19) is installed at the center of the cylinder (3); the driving mechanism (20) is connected to the screening and washing mechanism (19); the end cap (17) is screwed to the opening end of the cylinder (3); the water inlet (18) is installed on the end cap (17), and a valve is installed on the water inlet (18); The drive mechanism (20) is controlled to drive the screening and washing mechanism (19) to swing back and forth; When the sieving and washing mechanism (19) corresponds to the washing plate (7), it can disturb the water flow on the washing plate (7) by swinging, thus completing the washing of rice seeds; when the sieving and washing mechanism (19) corresponds to the first sieve plate (8), it can collect inferior seeds and seed coats floating on the water surface by swinging.

3. The method for selecting and raising seedlings of cold-resistant rice according to claim 2, characterized in that, The first sieve plate (8) has sieve holes arranged in an array, with a hole diameter greater than 5 mm; The second sieve plate (9) has an array of sieve holes with a diameter of less than 1.6 mm.

4. The method for selecting and raising seedlings of cold-resistant rice according to claim 2, characterized in that, Also includes: Slot (10); There are two slots (10), which are installed symmetrically inside the cylinder (3), and the two ends of the second sieve plate (9) are respectively inserted into the two slots (10).

5. The method for selecting and raising seedlings of cold-resistant rice according to claim 2, characterized in that, Also includes: Drainage pipe (13); The drain pipe (13) is installed on the cylinder (3) and communicates with the isolation chamber (11). A valve is installed on the drain pipe (13).

6. The method for selecting and raising seedlings of cold-resistant rice according to claim 2, characterized in that, The screening and washing mechanism (19) includes: a central tube (191), a central trough (192), a flap (193), a shovel (194), a chute (195), a screw barrel (196), a lead screw (197), a through groove (198), a slide rail (199), a slider (1910), a moving rod (1911), a crossbeam (1912), and a rotating rod (1913). The central tube (191) is rotatably installed at the center of the cylinder (3), and its two ends extend out of the center of the cylinder (3) and the end cap (17) respectively; the central groove (192) is installed in the middle of the central tube (191); there are several flaps (193), which are installed at equal intervals on the lower surface of the central groove (192); the through groove (198) is opened on the central groove (192); the shovel plate (194) is installed in the through groove (198) and can move up and down, and the shovel plate (194) is arranged in a J-shape; there are two sliding grooves (195), which are symmetrically installed on the lower surface of the central groove (192) and are slidably connected to the shovel plate (194); The screw barrel (196) is rotatably mounted on one end of the central tube (191); the lead screw (197) is mounted inside the central tube (191) and threadedly connected to the screw barrel (196); the slide rail (199) is formed on the lead screw (197); the slider (1910) is mounted on the inner wall of the central tube (191) and slidably connected to the slide rail (199); the moving rod (1911) is mounted on the end of the lead screw (197) away from the screw barrel (196); the crossbeam (1912) is mounted on the shovel plate (194); the two ends of the rotating rod (1913) are rotatably connected to the moving rod (1911) and the crossbeam (1912) respectively.

7. The method for selecting and raising seedlings of cold-resistant rice according to claim 2, characterized in that, The drive mechanism (20) includes: a fixed seat (201), a reciprocating screw (202), a movable seat (203), a guide rod (204), a swing rod (205), a spline (206), a drive groove (207), an extension arm (208), and a second motor (209); The reciprocating screw (202) is rotatably mounted between two fixed seats (201); the second motor (209) is mounted on one of the fixed seats (201) and connected to one end of the reciprocating screw (202); the movable seat (203) is threadedly connected to the reciprocating screw (202); the guide rod (204) is mounted between the two fixed seats (201) and slidably connected to the movable seat (203); the spline (206) is mounted on the swing rod (205), and the end of the middle tube (191) away from the end cover (17) is provided with a keyway, and the spline (206) is inserted into the keyway; the drive groove (207) is opened on the swing rod (205); the extension arm (208) is mounted on the movable seat (203) and extends into the drive groove (207).

8. The method for selecting and raising seedlings of cold-resistant rice according to claim 2, characterized in that, The device also includes a base (1), a bracket (2), a housing (4), and a heating wire (5); The bracket (2) is installed on the top of the base (1) and is rotatably connected to the cylinder (3); the outer shell (4) is installed on the outside of the cylinder (3); the heating wire (5) is installed inside the outer shell (4) and is in contact with the outer wall of the cylinder (3); The heating wire (5) is spirally installed inside the outer casing (4).

9. The method for selecting and raising seedlings of cold-resistant rice according to claim 2, characterized in that, Also includes: The transmission mechanism includes: a gear ring (14), a connecting member (15), a gear (16), and a first motor (21). The gear ring (14) is mounted on the cylinder (3); the connector (15) is mounted on the base (1); the gear (16) is rotatably mounted on the connector (15) and meshes with the gear ring (14); the first motor (21) is mounted on the connector (15) and its output end is connected to the gear (16).

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