Impurity removing and screening device for seed breeding

Abstract

The utility model relates to the technical field of impurity removal and screening of seeds, in particular to an impurity removal and screening device for seed breeding, which performs efficient impurity removal and screening on different seeds by using a screening solution with larger density and changing the size of effective screening holes, is not limited by pipelines and has higher working efficiency. Comprising a screening box and a middle adding hopper. The fixed sieve plate is horizontally installed on the upper portion of the screening box, the movable sieve plate is movably installed on the fixed sieve plate, a notch is formed in the upper portion of one side wall of the screening box, the gate plate is installed on the side wall in a sliding mode, and the gate plate shields the notch of the screening box from bottom to top; the input end of the first guide groove is aligned to the bottom of the notch of the screening box, the input end of the second guide groove is aligned to the upper portion of the notch of the screening box, the backflow box is installed on the outer wall of the screening box, and an upper end opening of the backflow box is located below the output end of the first guide groove and the output end of the second guide groove.

Description

Technical Field

[0001] The utility model relates to the technical field of seed impurity removal and screening, in particular to an impurity removal and screening device for seed breeding. Background Art

[0002] During seed breeding, it is necessary to use an impurity removal and screening device to remove impurities from the seeds. For example, a rice seed impurity removal and screening device is proposed in the Chinese invention patent with application number CN202110974926.0. When the impurity removal and screening device is in use, the impurity removal and material guiding unit is first driven by the vibration unit to work. While putting seeds into the feed pipe, the sand carried by the seeds is first taken out to ensure that the seeds entering the box only need to be screened for empty shells and shriveled grains. It is more efficient to process them in a graded manner. The seeds enter the open water tank through the feed pipe, where the empty shells and shriveled grains will float on the water surface, while the intact seeds will enter the curved pipe, and water will be added to the open water tank through the water supply pipe. At this time, the water flow will agitate in the curved pipe fitting, and the seeds sunk in the curved pipe fitting will be turned over. Even if there are empty shells and shriveled grains among them, they will be transported to the water surface in the open water tank with the water flow. As the amount of water increases, when it overflows from the open water tank, the water will carry the empty shells and shriveled grains to the overflow discharge unit for discharge, and there is no need to scoop them up like conventional equipment. When the valve on the connecting pipe fitting is opened, the water flow in the curved pipe fitting will carry the intact seeds into the drying discharge unit, and the drying and discharge are carried out simultaneously, which increases the effect. On the whole, the equipment overcomes some difficulties of the water selection method. It is very convenient to discharge empty shells, shriveled grains or intact seeds, and the overall structure is relatively simple, and the actual use effect is good.

[0003] However, the above-mentioned prior art uses a curved pipe to screen empty shells and deflated grains, and the diameter of the pipe is limited, which limits the efficiency of impurity removal and screening. Therefore, it is necessary to make improvements based on the above-mentioned prior art. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a seed breeding impurity removal and screening device which uses a screening solution with a relatively high density and changes the size of the effective sieve holes to efficiently remove impurities from different seeds and is not restricted by pipelines and has a higher working efficiency.

[0005] The utility model discloses a seed breeding impurity removal and screening device, comprising a screening box and a centering bucket, wherein an opening is arranged at the upper end of the screening box, the centering bucket is installed on the side wall of the screening box, and the output end of the centering bucket extends into the middle of the screening box; the utility model also comprises a fixed screen plate, a movable screen plate, a gate plate, a guide groove one, a guide groove two and a reflux box, wherein the fixed screen plate is horizontally installed on the upper part of the screening box, the movable screen plate is movably installed on the fixed screen plate, screen holes are arranged on both the movable screen plate and the fixed screen plate, the screen holes on the fixed screen plate and the movable screen plate are arranged alternately, a notch is arranged at the upper part of one side wall of the screening box, and the gate plate slides The gate plate is installed on the side wall, and blocks the notch of the screening box from bottom to top. The input ends of guide groove 1 and guide groove 2 are installed on the outer side of the side wall of the screening box, and the input end of guide groove 1 is aligned with the bottom of the notch of the screening box, and the input end of guide groove 2 is aligned with the upper part of the notch of the screening box. The reflux box is installed on the outer wall of the screening box, and the upper port of the reflux box is located below the output end of guide groove 1 and the output end of guide groove 2; the size of the effective sieve holes of the staggered sieve holes is changed by adjusting the relative position of the fixed sieve plate and the movable sieve plate, so that the effective sieve holes can intercept complete and full seeds. The seeds can pass through the fixed sieve plate and the empty shells and the empty grains can pass through. The screening solution is added into the screening box so that the liquid level of the screening solution is above the moving sieve plate. The density of the screening solution is greater than the density of the seeds. The agent for soaking the seeds can be added into the screening solution. The seeds are input into the middle of the screening box through the middle bucket. The impurities with high density such as sand particles sink to the bottom of the screening box. The seeds are intercepted by the fixed sieve plate and the moving sieve plate. The empty shells and the empty grains float to the screening liquid level through the effective sieve holes of the fixed sieve plate and the moving sieve plate. The upper end face of the gate plate is aligned with the input end of the guide groove 1, and the screening box is continuously filled with the screening solution. The screening solution is screened, so that after the screening solution rises, it carries the empty shells and deflated particles out along the guide groove one, the empty shells and deflated particles are intercepted and removed, and the screening solution flows into the reflux box, the position of the movable screen plate is adjusted to increase the effective screen hole to allow the seeds to pass through, the gate plate is raised, the upper end surface of the gate plate is aligned and connected with the input end of the guide groove two, and the screening solution is continuously added to the screening box, so that after the screening solution rises, it carries the seeds out along the guide groove two, the seeds are intercepted and collected, and the screening solution flows into the reflux box. Compared with the existing technology, the impurity removal and screening efficiency is not limited by the pipeline, and the working efficiency is higher.

[0006] Preferably, it also includes a circulation pump, a water outlet pipe and a suction pipe. The suction pipe is installed at the input end of the circulation pump, and the input end of the suction pipe extends into the reflux box. The output end of the circulation pump is installed with the water outlet pipe, and the output end of the water outlet pipe is located at the output end of the center bucket, and the output end of the water outlet pipe faces the fixed sieve plate; the circulation pump extracts the collected screening solution in the reflux box through the suction pipe, and the circulation pump inputs the screening solution into the screening box through the push rod, so as to realize the recycling of the screening solution, and the screening solution will impact the seeds input through the center bucket toward the fixed sieve plate, so that the seeds are dispersed and tumbled, thereby improving the efficiency of seed screening.

[0007] Preferably, it also includes a push rod, the fixed end of which is mounted on the screening box, and the lower end of the piston rod of the push rod is connected to the gate plate; the piston rod of the push rod drives the gate plate to automatically rise and fall, thereby realizing automatic screening.

[0008] Preferably, it also includes a collecting box 1, a collecting box 2 and a bracket, the bracket is installed on the upper port of the reflux box, the collecting box 1 and the collecting box 2 are both placed on the bracket, and the bottoms of the collecting box 1 and the collecting box 2 are both provided with water holes, the collecting box 1 is located below the output end of the guide groove 1, and the collecting box 2 is located below the output end of the guide groove 2; the collecting box 1 is used to intercept the empty shells and deflated grains flowing down along the guide groove 1, and the screening solution flows into the reflux box through the water holes of the collecting box 1 and the bracket, and the collecting box 2 is used to intercept the seeds flowing down along the guide groove 2, and the screening solution flows into the reflux box through the water holes of the collecting box 2 and the bracket, so as to collect the seeds.

[0009] Preferably, it also includes a debris collecting bucket, a debris discharge cover and a sewage pipe. The debris collecting bucket is arranged at the bottom of the screening box, the debris discharge pipe is arranged at the bottom of the debris collecting bucket, the debris discharge cover is screwed on the lower port of the sewage discharge pipe, the sewage discharge pipe is installed at the bottom of the reflux box, and the sewage discharge pipe is connected with the bottom of the reflux box; impurities are gathered in the debris discharge cover of the sewage discharge pipe through the debris collecting bucket, and the impurities and screening solution can be discharged by opening the debris discharge cover after working for a period of time, and the screening solution collected in the reflux box can be discharged by opening the sewage discharge pipe.

[0010] Preferably, it also includes a sliding key, a lever, an axle rod and a rocker rod. The fixed screen plate is provided with a sliding key, and a sliding groove matching the sliding key is provided on the lower end surface of the movable screen plate. The movable screen plate and the fixed screen plate are slidingly connected through the sliding groove and the sliding key. A lever is provided on the movable screen plate, the lower end of the axle rod is rotatably connected to the fixed screen plate, one end of the rocker rod is connected to the shaft rod, and a long slot hole is provided on the other end of the rocker rod, and the lever is slidably installed in the long slot hole of the rocker rod; the shaft rod is rotated, and the shaft rod drives the rocker rod to rotate, and the long slot hole of the rocker rod drives the lever, and the lever drives the movable screen plate to move along the sliding key, so that the positions of the movable screen plate and the fixed screen plate are changed, thereby changing the size of the staggered sieve holes of the fixed screen plate and the movable screen plate, and the operation is simple and convenient.

[0011] Compared with the prior art, the utility model has the following beneficial effects: by adjusting the relative positions of the fixed sieve plate and the moving sieve plate, the size of the effective sieve holes of the staggered sieve holes is changed, so that the effective sieve holes can intercept complete and full seeds, and can allow empty shells and shrunken grains to pass through, a sieving solution is added to the sieving box, so that the liquid level of the sieving solution is located above the moving sieve plate, the density of the sieving solution is greater than the density of the seeds, a medicine for soaking seeds can be added to the sieving solution, the seeds are input into the middle of the sieving box through the center hopper, and impurities with high density such as sand particles sink to the bottom of the sieving box, the seeds are intercepted by the fixed sieve plate and the moving sieve plate, and the empty shells and shrunken grains float through the effective sieve holes of the fixed sieve plate and the moving sieve plate When it reaches the screening liquid level, align the upper end face of the gate plate with the input end of guide groove one, continue to add screening solution to the screening box, so that the screening solution will rise and carry the empty shells and deflated particles out along guide groove one, intercept and remove the empty shells and deflated particles, and the screening solution will flow into the reflux box, adjust the position of the moving screen plate to increase the effective sieve holes to allow seeds to pass through, raise the gate plate, align and connect the upper end face of the gate plate with the input end of guide groove two, continue to add screening solution to the screening box, so that the screening solution will rise and carry the seeds out along guide groove two, intercept and collect the seeds, and the screening solution will flow into the reflux box. Compared with the existing technology, the impurity removal and screening efficiency is not limited by the pipeline, and the work efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the axonometric structure of the utility model;

[0014] Figure 3 It is a rear axonometric structural schematic diagram of the utility model;

[0015] Figure 4 It is a schematic diagram of the structure of the screening box, the moving screen plate, the gate plate, the guide groove 1 and the guide groove 2 in the exploded state;

[0016] Figure 5 It is a schematic diagram of the structure of the reflux box, the circulation pump, the collecting box 1 and the collecting box 2 in the exploded state;

[0017] Figure 6 It is a structural schematic diagram of the fixed screen plate, movable screen plate and other structures in the exploded state.

[0018] Markings in the attached figure: 1. screening box; 2. center bucket; 3. fixed screen plate; 4. moving screen plate; 5. gate plate; 6. guide groove 1; 7. guide groove 2; 8. reflux box; 9. circulation pump; 10. water outlet pipe; 11. suction pipe; 12. push rod; 13. collecting box 1; 14. collecting box 2; 15. bracket; 16. debris collecting bucket; 17. debris discharge cover; 18. sewage pipe; 19. sliding key; 20. lever; 21. shaft rod; 22. rocker arm. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive. Example 1

[0020] like Figures 1 to 5 As shown, a device for removing impurities and screening for seed breeding comprises a screening box 1 and a centering bucket 2, wherein an opening is arranged at the upper end of the screening box 1, the centering bucket 2 is mounted on the side wall of the screening box 1, and the output end of the centering bucket 2 extends into the middle of the screening box 1; the device also comprises a fixed screen plate 3, a movable screen plate 4, a gate plate 5, a guide groove 1 6, a guide groove 2 7 and a reflux box 8, the fixed screen plate 3 is horizontally mounted on the upper part of the screening box 1, the movable screen plate 4 is movably mounted on the fixed screen plate 3, the movable screen plate 4 and the fixed screen plate 3 are both provided with screen holes, and the screen holes on the fixed screen plate 3 and the movable screen plate 4 are respectively arranged in an alternating manner, so that the screening A notch is arranged at the upper part of one side wall of the box 1, and a gate plate 5 is slidably mounted on the side wall, and the gate plate 5 blocks the notch of the screening box 1 from bottom to top. The input ends of the guide groove 1 6 and the guide groove 2 7 are mounted on the outer side of the side wall of the screening box 1, and the input end of the guide groove 1 6 is aligned with the bottom of the notch of the screening box 1, and the input end of the guide groove 2 7 is aligned with the upper part of the notch of the screening box 1. The reflux box 8 is mounted on the outer wall of the screening box 1, and the upper port of the reflux box 8 is located below the output end of the guide groove 1 6 and the output end of the guide groove 2 7; it also includes a circulating pump 9, a water outlet pipe 10 and a pumping The circulating pump 9 is provided with a water extraction pipe 11 at its input end, and its input end is extended into the reflux box 8. The circulating pump 9 is provided with a water outlet pipe 10 at its output end, and its output end is located at the output end of the adding bucket 2, and its output end is directed toward the fixed sieve plate 3. The circulating pump 9 also includes a push rod 12, whose fixed end is installed on the screening box 1, and whose piston rod lower end is connected to the gate plate 5. The collecting box 1 13, the collecting box 2 14 and the bracket 15 are provided on the upper port of the reflux box 8, and the collecting box 1 1 3 and collecting box two 14 are placed on the bracket 15, and water permeable holes are set at the bottom of collecting box one 13 and collecting box two 14. Collecting box one 13 is located below the output end of guide groove one 6, and collecting box two 14 is located below the output end of guide groove two 7; it also includes a debris collecting bucket 16, a debris discharge cover 17 and a sewage pipe 18. The debris collecting bucket 16 is set at the bottom of the screening box 1, and the debris discharge pipe is set at the bottom of the debris collecting bucket 16. The debris discharge cover 17 is screwed on the lower port of the sewage discharge pipe. The sewage pipe 18 is installed at the bottom of the reflux box 8, and the sewage pipe 18 is connected to the bottom of the reflux box 8.

[0021] By adjusting the relative positions of the fixed sieve plate 3 and the moving sieve plate 4, the effective sieve holes of the staggered sieve holes are changed, so that the effective sieve holes can intercept complete and full seeds, and can allow empty shells and shrunken grains to pass through. The circulating pump 9 extracts the collected screening solution in the reflux box 8 through the suction pipe 11, and the circulating pump 9 inputs the screening solution into the screening box 1 through the push rod 12, so that the liquid level of the screening solution is located above the moving sieve plate 4. The density of the screening solution is greater than the density of the seeds, and the screening solution can be The seeds are soaked in the agent, and the seeds are input into the middle of the screening box 1 through the middle bucket 2. The impurities with high density such as sand particles sink to the bottom of the screening box 1. The impurities are collected in the impurity discharge cover 17 of the impurity discharge pipe through the impurity collection bucket 16. The seeds are intercepted by the fixed sieve plate 3 and the moving sieve plate 4. The screening solution impacts the seeds input through the middle bucket 2 to the fixed sieve plate 3, so that the seeds are dispersed and rolled. The empty shells and deflated grains float to the screening liquid surface through the effective sieve holes of the fixed sieve plate 3 and the moving sieve plate 4, and the piston of the push rod 12 The rod drives the gate plate 5 to automatically rise and fall, and the push rod 12 aligns the upper end surface of the gate plate 5 with the input end of the guide groove 6, and continues to add screening solution to the screening box 1, so that the screening solution is raised and flows out along the guide groove 6 with empty shells and deflated particles, and the collecting box 13 intercepts and removes the empty shells and deflated particles, and the screening solution flows into the reflux box 8, and the position of the movable sieve plate 4 is adjusted to increase the effective sieve hole to allow seeds to pass through. The push rod 12 raises the gate plate 5, aligns and connects the upper end surface of the gate plate 5 with the input end of the guide groove 7, and continues to add screening solution to the screening box 1, so that the screening solution is raised and flows out along the guide groove 7 with seeds, and the collecting box 14 intercepts and collects the seeds, and the screening solution flows into the reflux box 8. Compared with the prior art, the impurity removal and screening efficiency is not limited by the pipeline, the working efficiency is higher, and the recycling of the screening solution is realized. After working for a period of time, the impurity discharge cover 17 can be opened to discharge impurities and screening solution, and the sewage pipe 18 can be opened to discharge the screening solution collected in the reflux box 8. Example 2

[0022] like Figure 6 As shown, on the basis of Example 1, it also includes a sliding key 19, a lever 20, an axle rod 21 and a rocker rod 22. The sliding key 19 is arranged on the fixed sieve plate 3, and a slide groove matching the sliding key 19 is arranged on the lower end surface of the movable sieve plate 4. The movable sieve plate 4 and the fixed sieve plate 3 are slidingly connected through the slide groove and the sliding key 19. The lever 20 is arranged on the movable sieve plate 4, the lower end of the axle rod 21 is rotatably connected to the fixed sieve plate 3, one end of the rocker rod 22 is connected to the axle rod 21, and a long slot hole is arranged on the other end of the rocker rod 22. The lever 20 is slidably installed in the long slot hole of the rocker rod 22; the axle rod 21 is rotated, and the axle rod 21 drives the rocker rod 22 to rotate, and the long slot hole of the rocker rod 22 drives the lever 20, and the lever 20 drives the movable sieve plate 4 to move along the sliding key 19, so that the positions of the movable sieve plate 4 and the fixed sieve plate 3 are changed, thereby changing the size of the staggered sieve holes of the fixed sieve plate 3 and the movable sieve plate 4, and the operation is simple and convenient.

[0023] like Figures 1 to 6As shown, the utility model is a seed breeding impurity removal and screening device. When it is working, the shaft rod 21 and the swing rod 22 are rotated first, and the swing rod 22 drives the lever 20, and the lever 20 drives the moving screen plate 4 to move along the sliding key 19, and the relative position of the fixed screen plate 3 and the moving screen plate 4 is adjusted to change the size of the effective screen holes of the staggered screen holes, so that the effective screen holes can intercept complete and full seeds, and can allow empty shells and deflated grains to pass through, and then the circulating pump 9 is operated to add screening solution to the screening box 1, so that the liquid level of the screening solution is located above the moving screen plate 4, and the seeds are input into the middle of the screening box 1 through the centering bucket 2, and the impurities with high density such as sand particles sink into the bottom impurity removal cover 17 of the screening box 1, and the seeds are intercepted by the fixed screen plate 3 and the moving screen plate 4. The empty shells and deflated grains pass through the fixed screen plate 3 and The effective sieve holes of the moving sieve plate 4 float to the screening liquid surface, and then the upper end surface of the gate plate 5 is aligned with the input end of the guide groove 6. The circulating pump 9 continues to add screening solution to the screening box 1, so that the screening solution rises and carries the empty shells and deflated particles out along the guide groove 6. The collecting box 13 intercepts the empty shells and deflated particles, and the screening solution flows into the reflux box 8. Finally, the position of the moving sieve plate 4 is adjusted by the shaft 21 and the rocker 22 to increase the effective sieve holes to allow seeds to pass through. The push rod 12 raises the gate plate 5, aligns the upper end surface of the gate plate 5 with the input end of the guide groove 7, and connects it. The circulating pump 9 continues to add screening solution to the screening box 1, so that the screening solution rises and carries the seeds out along the guide groove 7. The collecting box 14 intercepts and collects the seeds, and the screening solution flows into the reflux box 8.

[0024] The main functions achieved by this utility model are:

[0025] 1. By using a screening solution with a higher density and changing the size of the effective sieve holes, different seeds can be screened for efficient impurity removal without being restricted by pipelines, and the work efficiency is higher;

[0026] 2. Soak the seeds in medicine while screening them;

[0027] 3. Convenient to recover seeds, simple operation.

[0028] The utility model is a kind of impurity removal and screening device for seed breeding, and its installation method, connection method or setting method are all common mechanical methods, and can be implemented as long as it can achieve its beneficial effects; the screening box 1, center bucket 2, fixed screen plate 3, movable screen plate 4, circulating pump 9, water outlet pipe 10, water suction pipe 11, push rod 12, impurity removal cover 17, sewage pipe 18, and sliding key 19 of the impurity removal and screening device for seed breeding of the utility model are purchased on the market, and technical personnel in the industry only need to install and operate it according to the accompanying instruction manual, without the need for technical personnel in this field to pay creative labor.

[0029] All technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A seed breeding impurity removal and screening device, comprising a screening box (1) and a centering bucket (2), wherein an opening is arranged at the upper end of the screening box (1), the centering bucket (2) is mounted on the side wall of the screening box (1), and the output end of the centering bucket (2) extends into the middle of the screening box (1); characterized in that: It also includes a fixed screen plate (3), a movable screen plate (4), a gate plate (5), a guide groove 1 (6), a guide groove 2 (7) and a return box (8), wherein the fixed screen plate (3) is horizontally mounted on the upper part of the screening box (1), the movable screen plate (4) is movably mounted on the fixed screen plate (3), screen holes are arranged on the movable screen plate (4) and the fixed screen plate (3), and the screen holes on the fixed screen plate (3) and the movable screen plate (4) are arranged alternately, a notch is arranged on the upper part of one side wall of the screening box (1), and the gate plate (5) is slidably mounted on the side wall, The gate plate (5) blocks the notch of the screening box (1) from bottom to top, the input ends of the guide groove one (6) and the guide groove two (7) are installed on the outer side of the side wall of the screening box (1), the input end of the guide groove one (6) is aligned with the bottom of the notch of the screening box (1), the input end of the guide groove two (7) is aligned with the upper part of the notch of the screening box (1), and the reflux box (8) is installed on the outer wall of the screening box (1), and the upper port of the reflux box (8) is located below the output ends of the guide groove one (6) and the output ends of the guide groove two (7).

2. A seed breeding impurity removal and screening device as claimed in claim 1, characterized in that: It also includes a circulation pump (9), a water outlet pipe (10) and a water extraction pipe (11), wherein the water extraction pipe (11) is installed at the input end of the circulation pump (9), the input end of the water extraction pipe (11) extends into the reflux box (8), and the water outlet pipe (10) is installed at the output end of the circulation pump (9), the output end of the water outlet pipe (10) is located at the output end of the center bucket (2), and the output end of the water outlet pipe (10) faces the fixed sieve plate (3).

3. A seed breeding impurity removal and screening device as claimed in claim 1, characterized in that: It also includes a push rod (12), the fixed end of which is mounted on the screening box (1), and the lower end of the piston rod of the push rod (12) is connected to the gate plate (5).

4. A seed breeding impurity removal and screening device as claimed in claim 1, characterized in that: It also includes a collecting box 1 (13), a collecting box 2 (14) and a bracket (15), wherein the bracket (15) is mounted on the upper port of the reflux box (8), the collecting box 1 (13) and the collecting box 2 (14) are both placed on the bracket (15), and the bottoms of the collecting box 1 (13) and the collecting box 2 (14) are both provided with water permeable holes, the collecting box 1 (13) is located below the output end of the guide groove 1 (6), and the collecting box 2 (14) is located below the output end of the guide groove 2 (7).

5. The impurity removal and screening device for seed breeding as claimed in claim 1, characterized in that: The invention also comprises a debris collecting bucket (16), a debris discharging cover (17) and a sewage discharge pipe (18). The debris collecting bucket (16) is arranged at the bottom of the screening box (1), the sewage discharge pipe is arranged at the bottom of the debris collecting bucket (16), the sewage discharge cover (17) is screwed onto the lower end of the sewage discharge pipe, the sewage discharge pipe (18) is installed at the bottom of the return box (8), and the sewage discharge pipe (18) is communicated with the bottom of the return box (8).

6. The impurity removal and screening device for seed breeding as claimed in claim 1, characterized in that: The invention also comprises a sliding key (19), a lever (20), an axle rod (21) and a swing rod (22); the sliding key (19) is arranged on the fixed screen plate (3); a sliding groove matching the sliding key (19) is arranged on the lower end surface of the movable screen plate (4); the movable screen plate (4) and the fixed screen plate (3) are slidably connected via the sliding groove and the sliding key (19); the lever (20) is arranged on the movable screen plate (4); the lower end of the axle rod (21) is rotatably connected to the fixed screen plate (3); one end of the swing rod (22) is connected to the axle rod (21); the other end of the swing rod (22) is arranged with a long slot hole; the lever (20) is slidably mounted in the long slot hole of the swing rod (22).

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