Seed screening device and method for wheat breeding

Abstract

The invention relates to the technical field of wheat breeding, and discloses a seed screening device and method for wheat breeding, the seed screening device comprises a screening box, a feeding port is fixedly connected to the middle of the top end of the screening box, and convex grooves are formed in the positions, close to the top end, of the two sides of the inner wall of the screening box; a sieve plate groove is movably formed in the position, close to the top end, of the interior of the screening box, convex blocks are fixedly connected to the two sides of the sieve plate groove correspondingly, the outer walls of the two convex blocks are slidably connected into the two convex grooves correspondingly, the bottom end of the sieve plate groove is knocked, the sieve plate groove is driven to slide in the convex grooves in a reciprocating mode under driving of the convex blocks on the two sides of the sieve plate groove, and the sieve plate groove is formed. Impurities in wheat seeds in the sieve plate groove are separated from wheat, a threaded sleeve block moves and drives a supporting plate and a cleaning steel brush at the top end of the supporting plate to move at the bottom end of the sieve plate groove at the same time, then impurities clamped at screening holes of the sieve plate groove are cleaned, and the seed screening efficiency during wheat breeding is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of wheat breeding technology, and more specifically to a seed screening device and method for wheat breeding. Background Technology

[0002] Wheat breeding is an agricultural technology that uses gene recombination, artificial mutagenesis, and other techniques to cultivate superior new wheat varieties, aiming to improve stress resistance, yield, and resource utilization efficiency. my country has established a two-line hybrid wheat technology system, and the bred varieties yield 15%-20% more than conventional wheat, save water and fertilizer, and reduce the sowing amount by one-third. In the seed selection process, seeds are often screened by visual inspection and manual removal to eliminate seeds that are deformed, diseased, or infested with pests.

[0003] Shortcomings of existing technology: However, the following problems still exist in the existing process of wheat selection and separation: 1. Existing wheat breeding screening devices only use simple vibrating screens to screen impurities in wheat seeds. While vibrating screens can remove large stones, grass, and other impurities, they are less effective at removing unhealthy seeds from wheat seeds, resulting in poor accuracy in wheat breeding screening. 2. When screening wheat seeds using a vibrating screen, large particles of gravel can easily clog the screen mesh, requiring staff to clean the screen before screening can continue, thus reducing the seed screening efficiency during wheat breeding. 3. When breeding wheat, it is necessary to clean the seeds to help remove residual pesticides and fertilizers from the seed surface, thereby improving the safety and quality of the seeds. The existing wheat breeding screening equipment does not include a water washing structure, which requires workers to wash the seeds again, increasing the labor intensity.

[0004] Therefore, there is a need to provide a seed screening device and method for wheat breeding to solve the problems mentioned above. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a seed screening device and method for wheat breeding, so as to solve the problems existing in the background art.

[0006] This invention provides the following technical solution: a seed screening device and method for wheat breeding, comprising a screening box, a feed inlet fixedly connected to the top center of the screening box, convex grooves formed on both sides of the inner wall of the screening box near the top, a sieve plate groove movably arranged inside the screening box near the top, convex blocks fixedly connected to both sides of the sieve plate groove, the outer walls of the two convex blocks slidably connected within the two convex grooves, discharge pipes fixedly connected to both sides of the bottom of the screening box, a washing tank fixedly connected to the bottom of the two discharge pipes, the bottom of the screening box being inclined at both sides of the two discharge pipes, a filter plate fixedly connected inside the washing tank near the bottom, and a water injection pipe arranged at the top left side of the washing tank. Seed screening devices for wheat breeding also include: A screening and cleaning assembly is installed between the bottom of the screening box and the bottom of the sieve plate groove, and is used to drive the sieve plate groove to vibrate and screen wheat seeds in the sieve plate groove. A two-way stirring assembly is installed inside the washing tank and the protective shell, and is used to fully stir the wheat seeds in the washing tank during the washing process. A filter water tank is located outside the washing tank and is used to filter and recycle the washing water in the washing tank. Preferably, the screening and cleaning assembly includes: The frame has limit grooves on both the front and rear sides, and limit rods are slidably connected inside the two limit grooves. Threaded sleeves are fixedly connected to the opposite sides of the two limit rods. Vibrating plates are fixedly connected to the front and rear sides of the top of the frame, and the two vibrating plates are located directly below the bottom of the screen plate groove on both sides. A guiding mechanism is provided at the middle of the threaded sleeve block, which is used to drive the threaded sleeve block to move inside the frame and drive the limiting slide rod to move.

[0007] Preferably, the guiding mechanism includes a rotary motor, the bottom end of which is fixedly connected to the right side of the inner wall of the screening box via a fixing plate. A screw is fixedly connected to the transmission end of the rotary motor. The outer wall of the screw is threadedly sleeved with the middle of the threaded sleeve block. Guide rods are movably sleeved near the front and rear sides of the threaded sleeve block. The two ends of the two guide rods are movably sleeved on both sides of the inner wall of the screening box.

[0008] Preferably, a support plate is fixedly connected to the top of the threaded sleeve block, and a cleaning steel brush is fixedly connected to the top of the support plate. The cleaning steel brush is movably disposed between the two vibrating plates.

[0009] Preferably, the bottom of the frame is fixedly connected to telescopic support plates near the front and rear sides, and the bottom ends of the two telescopic support plates are fixedly connected to the bottom of the screening box.

[0010] Preferably, the bidirectional stirring assembly includes: A U-shaped frame is fixedly connected to the top of a washing tank at its bottom end. Both ends of the U-shaped frame are fixedly connected to collars. A second stirring rod is movably sleeved in the middle of the collar at the top end. A second set of bevel gears is fixedly sleeved on the outer wall of the second stirring rod near the collar. A second agitator is fixedly sleeved on the outer wall of the second stirring rod inside the washing tank. A first stirring rod is movably sleeved in the middle of the collar at the bottom end. A first set of bevel gears is fixedly sleeved on the outer wall of the first stirring rod near the collar. A first agitator is fixedly sleeved on the outer wall of the first stirring rod inside the washing tank. The outer wall of the second stirring rod is movably sleeved with the inner wall of the first stirring rod. A driving mechanism is provided on the outer wall of the second and first bevel gears, and is used to drive the second and first bevel gears to rotate in opposite directions.

[0011] Preferably, the driving mechanism includes a stirring motor, which is fixedly connected between the U-shaped frame and the inner wall of the protective shell via a fixing plate. The transmission end of the stirring motor is fixedly connected to a main bevel gear through the U-shaped frame, and the outer wall of the main bevel gear meshes with the outer walls of the second and first auxiliary bevel gears.

[0012] Preferably, the top end of the second stirring rod is fixedly sleeved with a limiting block through a through collar, the middle part of the bottom end of the first stirrer is movably sleeved with the outer wall of the second stirring rod through a sleeve, and the bottom end of the second stirring rod is movably sleeved with the middle part of the filter plate through the through sleeve.

[0013] Preferably, a water outlet pipe is fixedly connected to the right side of the washing tank near the bottom, a water pump is fixedly connected to the middle of the water outlet pipe, a filter water tank is fixedly connected to one end of the water outlet pipe, an adsorption filter layer is fixedly connected to the middle of the filter water tank, and an inlet pipe is fixedly connected to the top of the filter water tank, with one end of the inlet pipe fixedly connected to the top of the washing tank near the right side.

[0014] Preferably, the following screening steps are included: Step 1: The wheat seeds to be screened are fed into the screening box through the feed inlet. The wheat seeds fall into the sieve plate groove to carry out the wheat breeding screening work. Step 2: Turn on the rotating motor. The vibrating plate vibrates up and down at the bottom of the sieve plate groove to initially screen the impurities in the wheat seeds in the sieve plate groove. Step 3: The screened wheat seeds enter the discharge pipe through the channels on both sides of the bottom of the screening box, and then slide into the washing tank. Large particles of impurities in the wheat seeds are separated and collected in the screen plate groove for the next cleaning step. Step 4: Fill the washing tank with water through the water injection pipe, turn on the stirring motor, and drive the first and second stirrers to rotate in opposite directions in the washing tank to wash and screen the wheat seeds in the washing tank. Healthy wheat seeds settle at the filter plate, while unhealthy wheat seeds and grass impurities float on the water surface, further completing the screening process. Step 5: Turn on the water pump to return the washing water in the washing tank to the washing tank for further use after passing through the adsorption filter layer in the filter tank. This allows for a second washing of the wheat seeds, saving water resources. Step Six: Collect the wheat seeds that have settled on the filter plate and been washed, and dry them to prepare for wheat seedling cultivation.

[0015] The technical effects and advantages of this invention are as follows: 1. This invention, by incorporating a screening and cleaning assembly, enables the sieving of wheat seeds within the sieve plate groove. The rotating motor drives the screw to rotate within the screening box, which in turn moves the threaded sleeve under the guidance of the guide rod. This, in turn, causes the limiting slide rods on both sides to slide within the limiting slide grooves on both sides of the frame. Supported by the telescopic support plate, the frame moves up and down along the trajectory of the limiting slide rods. This facilitates the movement of the vibrating plate at the top of the frame at the bottom of the sieve plate groove, striking the bottom. This causes the sieve plate to slide back and forth within the convex grooves on both sides, driven by the convex blocks, separating impurities from the wheat seeds. Simultaneously, the movement of the threaded sleeve moves the support plate and its top cleaning brush at the bottom of the sieve plate groove, cleaning impurities stuck in the screening holes and ensuring efficient seed screening during wheat breeding.

[0016] 2. This invention features a bidirectional stirring assembly. Wheat seeds, initially screened by a sieve plate groove, fall through a chute at the bottom of the screening box into the discharge pipe, and then enter the washing tank. Under the protection of the protective shell, the stirring motor is activated, driving the main bevel gear to rotate under the support of a U-shaped frame. This, in turn, drives the second and first bevel gears to rotate in opposite directions. With the limiting block and the movable engagement of the collar, the first and second stirring rods rotate in opposite directions. This facilitates the reverse rotation of the first and second stirring rods within the washing tank, thus washing the wheat seeds while further separating and removing unhealthy seeds floating on the water surface. Healthy seeds are collected at the top of the filter plate after washing and sedimentation, improving the efficiency of wheat breeding.

[0017] 3. This invention features a filter tank. After washing the wheat seeds, the water pump is turned on, and the washing water, filtered by the filter plate, enters the filter tank through the outlet pipe. Under the adsorption filtration of the adsorption filter layer, it is easier for the water to flow back into the washing tank through the inlet pipe for further washing, thus saving water resources and improving the washing efficiency of wheat seeds. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the sieve plate groove structure of the present invention.

[0021] Figure 4 This is a cross-sectional view of the frame structure of the present invention.

[0022] Figure 5 This is a schematic diagram of the cleaning steel brush structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the bidirectional stirring assembly of the present invention.

[0024] The attached figures are labeled as follows: 1. Screening box; 101. Convex groove; 2. Feed inlet; 3. Washing tank; 4. Water inlet pipe; 5. Filter water tank; 6. Water pump; 7. Screen plate groove; 701. Convex block; 8. Bidirectional stirring assembly; 801. Second set of bevel gears; 802. Limiting block; 803. Collar; 804. U-shaped frame; 805. Main bevel gear; 806. Stirring motor; 807. First set of bevel gears; 808. First stirring rod; 809. First stirrer; 8 10. Second agitator; 811. Second agitator rod; 9. Screening and cleaning assembly; 901. Vibrating plate; 902. Frame; 903. Limiting slide rod; 904. Limiting slide groove; 905. Telescopic support plate; 906. Guide rod; 907. Screw; 908. Rotating motor; 909. Cleaning steel brush; 910. Support plate; 911. Threaded sleeve block; 10. Discharge pipe; 11. Filter plate; 12. Protective shell; 13. Adsorption filter layer; 14. Water outlet pipe. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The seed screening device and method for wheat breeding involved in the present invention are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Specific Implementation Example 1 Please see Figures 1-5 This invention relates to a seed screening device and method for wheat breeding, comprising a screening box 1, a feed inlet 2 fixedly connected to the top center of the screening box 1, convex grooves 101 formed on both sides of the inner wall of the screening box 1 near the top, a sieve plate groove 7 movably disposed inside the screening box 1 near the top, convex blocks 701 fixedly connected to both sides of the sieve plate groove 7, the outer walls of the two convex blocks 701 slidably connected within the two convex grooves 101, and discharge pipes 10 fixedly connected to both sides of the bottom end of the screening box 1, with washing tanks 3 fixedly connected to the bottom ends of the two discharge pipes 10. The bottom end of the screening box 1 is located at the two discharge pipes. The pipe 10 is inclined on both sides. A filter plate 11 is fixedly connected to the inside of the washing tank 3 near the bottom. A water injection pipe is set at the top of the washing tank 3 near the left side. The seed screening device for wheat breeding also includes a screening and cleaning component 9. The screening and cleaning component 9 is set between the bottom of the screening box 1 and the bottom of the sieve plate groove 7. It is used to drive the sieve plate groove 7 to vibrate and screen the wheat seeds in the sieve plate groove 7. The screening and cleaning component 9 includes a frame 902. Limiting grooves 904 are opened on both the front and rear sides of the frame 902. Limiting rods 903 are slidably connected inside the two limiting grooves 904. A threaded sleeve block 911 is fixedly connected to the opposite side of the slide bar 903. Vibrating plates 901 are fixedly connected to both the front and rear sides of the top of the frame 902. The two vibrating plates 901 are located directly below the bottom of the screen plate groove 7 on both sides. A guiding mechanism is located in the middle of the threaded sleeve block 911, used to drive the threaded sleeve block 911 to move inside the frame 902, thereby driving the limiting slide bar 903 to move. The guiding mechanism includes a rotary motor 908. The bottom end of the rotary motor 908 is fixedly connected to the right side of the inner wall of the screening box 1 via a fixing plate. A screw 907 is fixedly connected to the transmission end of the rotary motor 908. The outer wall of the screen 902 is threadedly connected to the middle of the threaded sleeve 911. Guide rods 906 are movably connected to the front and rear sides of the threaded sleeve 911. The two ends of the two guide rods 906 are movably connected to the inner walls of the screening box 1. A support plate 910 is fixedly connected to the top of the threaded sleeve 911. A cleaning steel brush 909 is fixedly connected to the top of the support plate 910. The cleaning steel brush 909 is movably set between the two vibrating plates 901. Telescopic support plates 905 are fixedly connected to the bottom of the frame 902 near the front and rear sides. The bottom ends of the two telescopic support plates 905 are fixedly connected to the bottom of the screening box 1.

[0027] Specifically: Turning on the rotating motor 908 drives the screw 907 to rotate on the inner wall of the screening box 1, which in turn drives the threaded sleeve block 911 to move under the guidance of the guide rod 906, which in turn drives the limiting slide rods 903 on both sides to slide in the limiting slide grooves 904 on both sides of the frame 902. Under the telescopic support of the telescopic support plate 905, the frame 902 moves up and down along the moving trajectory of the limiting slide rods 903. Specific Implementation Example 2 Please see Figure 1-2 and Figure 6 Based on the first specific embodiment, a bidirectional stirring assembly 8 is also included. The bidirectional stirring assembly 8 is disposed inside the washing tank 3 and the protective shell 12, and is used to fully stir the wheat seeds in the washing tank 3 during washing. The bidirectional stirring assembly 8 includes: a U-shaped frame 804, the bottom end of which is fixedly connected to the top end of the washing tank 3. Both ends of the U-shaped frame 804 are fixedly connected to collars 803. A second stirring rod 811 is movably sleeved in the middle of the collar 803 at the top end. A second set of bevel gears 801 is fixedly sleeved on the outer wall of the second stirring rod 811 near the collar 803. A second agitator 810 is fixedly sleeved on the outer wall of the second stirring rod 811 inside the washing tank 3. A first stirring rod 808 is movably sleeved in the middle of the collar 803 at the bottom end. A first set of bevel gears 807 is fixedly sleeved on the outer wall of the first stirring rod 808 near the collar 803. A first agitator is fixedly sleeved on the outer wall of the first stirring rod 808 inside the washing tank 3. 809, the outer wall of the second stirring rod 811 is movably sleeved with the inner wall of the first stirring rod 808; the driving mechanism is located on the outer wall of the second bevel gear 801 and the first bevel gear 807, and is used to drive the second bevel gear 801 and the first bevel gear 807 to rotate in opposite directions. The driving mechanism includes a stirring motor 806, which is fixedly connected between the U-shaped frame 804 and the inner wall of the protective shell 12 through a fixing plate. The transmission end of the stirring motor 806 passes through the U-shaped frame 804 and is fixedly connected to the main bevel gear 805. The outer wall of the main bevel gear 805 meshes with the outer walls of the second bevel gear 801 and the first bevel gear 807. The top end of the second stirring rod 811 passes through the collar 803 and is fixedly sleeved with the limiting block 802. The middle part of the bottom end of the first stirrer 809 is movably sleeved with the outer wall of the second stirring rod 811 through a sleeve. The bottom end of the second stirring rod 811 passes through the sleeve and is movably sleeved with the middle part of the filter plate 11.

[0029] Specifically: Under the protection of the protective shell 12, the stirring motor 806 is turned on, and then the main bevel gear 805 is driven to rotate under the support of the U-shaped frame 804. This drives the second set of bevel gears 801 and the first set of bevel gears 807 to rotate in opposite directions. Under the limiting block 802 and the movable engagement of the collar 803, the first stirring rod 808 and the second stirring rod 811 are driven to rotate in opposite directions. This facilitates the first stirrer 809 and the second stirring rod 811 to rotate in opposite directions in the washing tank 3, thereby washing the wheat seeds in the washing tank 3. Specific Implementation Example 3 Please see Figures 1-2Based on specific embodiments one and two, it also includes a filter water tank 5. The filter water tank 5 is located outside the washing tank 3 and is used to filter and recycle the washing water in the washing tank 3. A water outlet pipe 14 is fixedly connected to the right side of the washing tank 3 near the bottom. A water pump 6 is fixedly connected to the middle of the water outlet pipe 14. The filter water tank 5 is fixedly connected to one end of the water outlet pipe 14. An adsorption filter layer 13 is fixedly connected to the middle of the filter water tank 5. A water inlet pipe 4 is fixedly connected to the top of the filter water tank 5. One end of the water inlet pipe 4 is fixedly connected to the top of the washing tank 3 near the right side.

[0031] Specifically: After washing the wheat seeds, the water pump 6 is turned on. The washing water is filtered by the filter plate 11 and enters the filter tank 5 through the outlet pipe 14. Under the adsorption filtration of the adsorption filter layer 13, it flows back to the washing tank 3 through the inlet pipe 4 for further washing.

[0032] The working principle of this invention is as follows: When screening wheat seeds in the sieve plate groove 7, the rotating motor 908 is turned on, driving the screw 907 to rotate on the inner wall of the screening box 1. This, in turn, drives the threaded sleeve block 911 to move under the guidance of the guide rod 906. This, in turn, drives the limiting slide rods 903 on both sides to slide within the limiting slide grooves 904 on both sides of the frame 902. Under the telescopic support of the telescopic support plate 905, the frame 902 moves up and down along the moving trajectory of the limiting slide rods 903, causing the top of the frame 902 to move up and down. The vibrating plate 901 moves up and down at the bottom of the sieve plate groove 7, striking the bottom of the sieve plate groove 7. This causes the sieve plate groove 7, driven by the convex blocks 701 on both sides, to slide back and forth within the convex groove 101, separating impurities from the wheat seeds within the sieve plate groove 7. Simultaneously, the threaded sleeve block 911 moves, causing the support plate 910 and its top cleaning steel brush 909 to move at the bottom of the sieve plate groove 7, thereby cleaning impurities stuck in the sieve plate groove 7's screening holes. The wheat seeds that have undergone preliminary screening by the sieve plate groove 7 then... The material falls from the chute at the bottom of the screening box 1 into the discharge pipe 10, and then into the washing tank 3. Under the protection of the protective shell 12, the stirring motor 806 is turned on, and then, supported by the U-shaped frame 804, it drives the main bevel gear 805 to rotate. This drives the second set of bevel gears 801 and the first set of bevel gears 807 to rotate in the opposite direction. Under the limiting block 802 and the movable engagement of the collar 803, the first stirring rod 808 and the second stirring rod 811 are driven to rotate in the opposite direction, driving the first stirrer 809 and the second stirring rod 811 to rotate in the opposite direction. The water is rotated in reverse inside the washing tank 3, which washes the wheat seeds inside the washing tank 3 and further separates and removes the unhealthy seeds floating on the surface of the water in the washing tank 3. The healthy seeds are collected at the top of the filter plate 11 after washing and settling. After washing the wheat seeds, the water pump 6 is turned on. The washing water is filtered by the filter plate 11 and enters the filter water tank 5 through the outlet pipe 14. Under the adsorption and filtration of the adsorption filter layer 13, it flows back to the washing tank 3 through the inlet pipe 4 for further washing.

[0033] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A seed screening device for wheat breeding, comprising a screening box (1), characterized in that: The screening box (1) has a feed inlet (2) fixedly connected to the top center. The inner walls of the screening box (1) are provided with convex grooves (101) near the top on both sides. A screen plate groove (7) is movably arranged inside the screening box (1) near the top. Convex blocks (701) are fixedly connected to both sides of the screen plate groove (7). The outer walls of the two convex blocks (701) are slidably connected within the two convex grooves (101). Discharge pipes (10) are fixedly connected to the bottom of the screening box (1) near both sides. A washing tank (3) is fixedly connected to the bottom of the two discharge pipes (10). The bottom of the screening box (1) is inclined at both sides of the two discharge pipes (10). A filter plate (11) is fixedly connected to the inside of the washing tank (3) near the bottom. A water injection pipe is provided at the top of the washing tank (3) near the left side. Seed screening devices for wheat breeding also include: Screening and cleaning assembly (9) is set between the bottom of the screening box (1) and the bottom of the sieve plate groove (7) to drive the sieve plate groove (7) to vibrate and screen the wheat seeds in the sieve plate groove (7). A bidirectional stirring assembly (8) is installed inside the washing tank (3) and the protective shell (12) to fully stir the wheat seeds in the washing tank (3) during washing. A filter water tank (5) is located outside the washing tank (3) and is used to filter and recycle the washing water in the washing tank (3).

2. The seed screening device for wheat breeding according to claim 1, characterized in that: The screening and cleaning component (9) includes: The frame (902) has limit grooves (904) on both the front and rear sides. Limit rods (903) are slidably connected inside the two limit grooves (904). Threaded sleeves (911) are fixedly connected to the opposite sides of the two limit rods (903). Vibration plates (901) are fixedly connected to the front and rear sides of the top of the frame (902). The two vibration plates (901) are located directly below the bottom of the screen plate groove (7). The guide mechanism is located in the middle of the threaded sleeve block (911) and is used to drive the threaded sleeve block (911) to move inside the frame (902) and drive the limit slide rod (903) to move.

3. The seed screening device for wheat breeding according to claim 2, characterized in that: The guiding mechanism includes a rotary motor (908), the bottom end of which is fixedly connected to the right side of the inner wall of the screening box (1) via a fixing plate. The transmission end of the rotary motor (908) is fixedly connected to a screw (907). The outer wall of the screw (907) is threadedly connected to the middle of the threaded sleeve block (911). Guide rods (906) are movably sleeved near the front and rear sides of the threaded sleeve block (911). The two ends of the two guide rods (906) are movably sleeved on both sides of the inner wall of the screening box (1).

4. The seed screening device for wheat breeding according to claim 2, characterized in that: The top end of the threaded sleeve (911) is fixedly connected to a support plate (910), and the top end of the support plate (910) is fixedly connected to a cleaning steel brush (909). The cleaning steel brush (909) is movably arranged between two vibrating plates (901).

5. A seed screening device for wheat breeding according to claim 2, characterized in that: The bottom of the frame (902) is fixedly connected to telescopic support plates (905) near the front and rear sides, and the bottom ends of the two telescopic support plates (905) are fixedly connected to the bottom of the screening box (1).

6. The seed screening device for wheat breeding according to claim 1, characterized in that: The bidirectional stirring assembly (8) includes: A U-shaped frame (804) is fixedly connected at its bottom end to the top end of the washing tank (3). Both ends of the U-shaped frame (804) are fixedly connected to collars (803). A second stirring rod (811) is movably sleeved in the middle of the collar (803) at the top end. A second set of bevel gears (801) is fixedly sleeved on the outer wall of the second stirring rod (811) near the collar (803). The second stirring rod (811) is located on the outer wall of the washing tank (3). A second stirrer (810) is fitted onto the bottom of the collar (803), and a first stirring rod (808) is movably fitted onto the middle of the collar (803). A first set of bevel gears (807) is fixedly fitted onto the outer wall of the first stirring rod (808) near the collar (803). A first stirrer (809) is fixedly fitted onto the outer wall of the first stirring rod (808) located inside the washing tank (3). The outer wall of the second stirring rod (811) is movably fitted onto the inner wall of the first stirring rod (808). A driving mechanism is provided on the outer wall of the second bevel gear (801) and the first bevel gear (807) for driving the second bevel gear (801) and the first bevel gear (807) to rotate in opposite directions.

7. A seed screening device for wheat breeding according to claim 6, characterized in that: The driving mechanism includes a stirring motor (806), which is fixedly connected between the U-shaped frame (804) and the inner wall of the protective shell (12) by a fixing plate. The transmission end of the stirring motor (806) passes through the U-shaped frame (804) and is fixedly connected to a main bevel gear (805). The outer wall of the main bevel gear (805) meshes with the outer walls of the second auxiliary bevel gear (801) and the first auxiliary bevel gear (807).

8. A seed screening device for wheat breeding according to claim 6, characterized in that: The top end of the second stirring rod (811) is fixedly sleeved with a limiting block (802) through a collar (803). The bottom middle part of the first stirrer (809) is movably sleeved with the outer wall of the second stirring rod (811) through a sleeve. The bottom end of the second stirring rod (811) is movably sleeved with the middle part of the filter plate (11) through the sleeve.

9. A seed screening device for wheat breeding according to claim 1, characterized in that: A water outlet pipe (14) is fixedly connected to the right side of the washing tank (3) near the bottom. A water pump (6) is fixedly connected to the middle of the water outlet pipe (14). A filter tank (5) is fixedly connected to one end of the water outlet pipe (14). An adsorption filter layer (13) is fixedly connected to the middle of the filter tank (5). An inlet pipe (4) is fixedly connected to the top of the filter tank (5). One end of the inlet pipe (4) is fixedly connected to the top of the washing tank (3) near the right side.

10. A seed screening method for wheat breeding, based on the seed screening device for wheat breeding according to any one of claims 1-9, characterized in that: The following screening steps are included: Step 1: The wheat seeds to be screened are fed into the screening box (1) through the feed inlet (2), and the wheat seeds fall into the sieve plate groove (7) to carry out wheat breeding screening work. Step 2: Turn on the rotating motor (908), and the vibrating plate (901) vibrates up and down at the bottom of the sieve plate groove (7) to initially screen the impurities in the wheat seeds at the sieve plate groove (7); Step 3: The wheat seeds screened out enter the discharge pipe (10) through the channels on both sides of the bottom of the screening box (1), and then slide into the washing box (3). Large particles of impurities in the wheat seeds are separated and collected in the screen plate groove (7) for the next cleaning work. Step 4: Water is injected into the washing tank (3) through the water injection pipe, and the stirring motor (806) is turned on, which drives the first stirrer (809) and the second stirrer (810) to rotate in opposite directions in the washing tank (3) to wash and screen the wheat seeds in the washing tank (3). Healthy wheat seeds settle at the filter plate (11), while unhealthy wheat seeds and grass impurities float on the water surface, further completing the screening work. Step 5: Turn on the water pump (6) to return the washing water in the washing tank (3) to the washing tank (3) for further use after the adsorption filtration layer (13) in the filter tank (5) is used to wash the wheat seeds again, thus saving water resources. Step 6: Collect and dry the wheat seeds that have settled on the filter plate (11) after screening and washing, in preparation for wheat seedling cultivation.

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