Corn seed selection device and method

Abstract

The present invention discloses a corn seed selection device and method, which belongs to the technical field of screening equipment, including a support frame, a swing seat, a screen assembly and an adjustment assembly, wherein the support frame is located above the swing seat, and the screen assembly is located in the support frame; the screen assembly includes a first sieve plate, a second sieve plate, a third sieve plate and a chassis from top to bottom, wherein the first sieve plate, the second sieve plate and the third sieve plate are connected to form sieve holes of different apertures, and the left and right sides of the first sieve plate, the second sieve plate, the third sieve plate and the chassis are respectively provided with a rotating shaft and a discharge pipe, and the second sieve plate, the third sieve plate and the chassis are clamped by two groups of upper and lower adjustment nuts and move up and down along the screw direction, and the second sieve plate and the third sieve plate are turned over by the rotating shaft and the discharge pipe. The present invention forms corresponding sieve holes according to different varieties of corn seeds through the combination of screen assemblies, improves screening efficiency, and can adjust the screen assembly to form multiple sieve plates for multi-stage screening.

Description

Technical Field

[0001] The invention belongs to the technical field of screening equipment, and in particular relates to a corn seed selection device and method. Background Art

[0002] Selected corn is a type of corn seed that has been screened, identified, cultivated, planted and finally harvested. After years of cultivation and screening, the selected corn grown has the characteristics of full grains, rich nutrition and high protein content.

[0003] The main purpose of corn seed selection is to improve the quality and uniformity of seeds, thereby increasing germination rate and crop yield. In the selection process, small, barren, broken and diseased grains are removed, and plump grains with uniform size, consistent color and the characteristics of the improved variety are selected as seeds.

[0004] The conventional device for screening corn seeds also has the following disadvantages:

[0005] 1. Corn seeds need to be graded and screened according to different particle sizes. The grading and screening process requires multiple screens. The existing installation and removal of the screens is complicated and inconvenient to operate;

[0006] 2. Different varieties of corn seeds require sieves with different apertures. The replacement of sieves with corresponding apertures is complicated and cannot flexibly adapt to the screening of different varieties of corn seeds;

[0007] Therefore, a corn seed selection device is needed that can conveniently replace the screen and adjust the screen aperture. Summary of the invention

[0008] The object of the present invention is to provide a corn seed selection device and method to solve the problems existing in the background technology.

[0009] The objective of the present invention is achieved through the following technical solutions:

[0010] A corn seed selection device comprises a support frame, a swing seat, a screen assembly and an adjustment assembly, wherein the support frame is located above the swing seat, the screen assembly is located inside the support frame, and two groups of the adjustment assemblies are respectively located on both sides of the support frame and connected to the support frame and the screen assembly;

[0011] The screen assembly includes a first screen plate, a second screen plate, a third screen plate and a bottom plate from top to bottom, and the first screen plate, the second screen plate, the third screen plate and the bottom plate are provided with a rotating shaft and a discharge pipe on the left and right sides respectively;

[0012] The adjusting assembly includes two groups of symmetrically arranged screw assemblies, the two groups of screw assemblies are respectively located on both sides of the axis of the screen assembly, the screw assembly includes a screw, an adjusting nut, a support column and a supporting sheet, the rotating shaft and the discharge pipe are respectively extended out of the support frame and clamped and fixed by the two groups of the screw assemblies, the second sieve plate, the third sieve plate and the bottom plate are clamped by the upper and lower groups of adjusting nuts and then move up and down along the screw direction, and the second sieve plate and the third sieve plate are turned over by the rotating shaft and the discharge pipe;

[0013] The sieve holes of the first sieve plate, the second sieve plate and the third sieve plate are reduced in sequence, and the first sieve plate, the second sieve plate, the third sieve plate and the bottom plate are plugged together in sequence, and the first sieve plate, the second sieve plate and the third sieve plate form sieve holes with different apertures through plugging.

[0014] Further, the first sieve plate has a plurality of first sieve holes in a circumferential array at the bottom;

[0015] A second plug-in column is provided at a position of the second sieve plate corresponding to the first sieve hole, the second plug-in column is plugged and matched with the first sieve hole, a second sieve hole is provided in the second plug-in column, and the second sieve hole is connected to the bottom of the second sieve plate;

[0016] A third plug-in column is provided at a position of the third sieve plate corresponding to the second sieve hole, the third plug-in column is plugged and matched with the second sieve hole, a third sieve hole is provided in the third plug-in column, and the third sieve hole is connected to the bottom of the third sieve plate;

[0017] A plunger is provided at a position of the chassis corresponding to the third sieve hole, and the plunger is plug-fitted with the third sieve hole.

[0018] Furthermore, the first sieve plate, the second sieve plate, the third sieve plate and the bottom plate are all cylindrical structures with one end open, the second plug-in column and the third plug-in column are respectively located on the outer side of the corresponding sieve plate, the length of the second plug-in column is adapted to the depth of the first sieve hole, the length of the third plug-in column is greater than the depth of the second sieve hole, and the length of the plunger is greater than the depth of the third sieve hole.

[0019] Further, the diameter of the first sieve plate is the same as the diameter of the second sieve plate, the outer diameter of the third sieve plate is the same as the inner diameter of the second sieve plate, and the inner diameter of the bottom plate is larger than the outer diameter of the first sieve plate.

[0020] Furthermore, the rotating shaft and the discharge pipe are symmetrically located on both sides of the bottom of the corresponding sieve plate or chassis, and the discharge pipe is connected to the inside of the corresponding sieve plate or chassis.

[0021] Furthermore, the side walls of the second sieve plate and the chassis are provided with slots corresponding to the positions of the rotating shaft and the discharge pipe, and a slide plate assembly is provided outside the slot, and the slide plate assembly includes a slide rail, a baffle and a spring. The two slide rails are respectively located on both sides of the slot, and the baffle is slidably connected to the slide rails. One end of the spring is connected to the baffle, and the other end of the spring is connected to the outer wall of the disc body. The size of the baffle is larger than the size of the slot.

[0022] Furthermore, the support column is sleeved on the screw rod, and the support column is located between the upper and lower adjusting nuts. The outer diameter of the support column is smaller than the outer diameter of the adjusting nut. The support plate is sleeved on the screw rod, and the support plate is located between the adjusting nut and the support column. The aperture of the support plate is smaller than the outer diameter of the support column, and the support plate is a rectangular structure with rounded corners at one end.

[0023] Furthermore, the support frame is a square frame structure, the bottom of the screw rod is fixed to the bottom of the support frame, a locking bolt is provided between the top of the screw rod and the top of the support frame, and the locking bolt passes through the screw rod and the support frame.

[0024] Furthermore, a hose is provided outside the discharge pipe, and a suction pump is provided at the other end of the hose.

[0025] A method for selecting corn seeds comprises the following steps:

[0026] Step 1: According to the corn seed variety, determine how many levels of particle size need to be screened and determine the size of each level of particle size.

[0027] Step 2: According to the result of step 1, the first sieve plate, the second sieve plate, the third sieve plate and the bottom plate are combined by adjusting the components to obtain corresponding sieve holes;

[0028] Step 3: Start the swing seat, pour the corn seeds to be screened into the first sieve plate and start screening;

[0029] Step 4: Start the suction pump at one end of the discharge pipe to extract the corn seeds screened at each stage;

[0030] Step 5: After the screening is completed, stop the suction pump and the swing seat.

[0031] The beneficial effects of the present invention are:

[0032] 1) According to different varieties of corn seeds, the corresponding sieve holes are combined through the sieve assembly to facilitate quick screening. At the same time, according to the number of screening levels required, the sieve assembly can be adjusted to form multiple sieve plates for synchronous screening for graded selection.

[0033] 2) The swing seat can drive multiple sieve plates to vibrate synchronously to complete multi-level sorting, thereby improving the efficiency of corn seed selection. At the same time, the distance between adjacent sieve plates can be adjusted by adjusting the components to prevent the seeds screened from the upper sieve plate from popping out of the lower sieve plate.

[0034] 3) The process of installing and removing the screen is simple and easy to operate, and the height and corresponding distance of the screen plate can be quickly adjusted.

[0035] 4) By plugging the first sieve plate, the second sieve plate and the third sieve plate together to form a channel through which only the third sieve hole passes, the smallest-sized seeds can be directly screened out, and the corn seeds that are too small can be quickly removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of a multi-stage screening state of a corn seed selection device of the present invention;

[0037] Figure 2 is a schematic diagram of the regulating component in the present invention;

[0038] Figure 3 It is a top view of the corn seed selection device of the present invention;

[0039] Figure 4 Schematic diagram of the slide plate assembly of the present invention, FIG. A is a schematic diagram of the slot of the second sieve plate, FIG. B is a schematic diagram of the slide plate assembly provided at the slot of the second sieve plate, and FIG. C is a schematic diagram of the top opening baffle of the rotating shaft of the third sieve plate inserted into the slot;

[0040] Figure 5 It is a schematic diagram of the second sieve plate and the third sieve plate after being turned over in the present invention;

[0041] Figure 6 It is a schematic diagram of Example 2 of the present invention;

[0042] Figure 7 It is a schematic diagram of Example 3 of the present invention;

[0043] Figure 8 It is a schematic diagram of Example 4 of the present invention;

[0044] In the figure, 1-support frame, 2-swing seat, 3-screw assembly, 31-screw, 32-adjusting nut, 33-support plate, 34-support column, 35-locking bolt, 4-screen assembly, 41-first sieve plate, 411-first sieve hole, 42-second sieve plate, 421-second plug-in column, 422-second sieve hole, 43-third sieve plate, 431-third plug-in column, 432-third sieve hole, 44-chassis, 441-plunger, 45-rotating shaft, 46-discharging pipe, 47-slide plate assembly, 471-slide rail, 472-spring, 473-baffle, 48-hose, 49-slot. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0046] Embodiment 1:

[0047] See also Figure 1-Figure 3 A corn seed selection device comprises a support frame 1, a swing seat 2, a screen assembly 4 and an adjustment assembly, wherein the support frame 1 is located above the swing seat 2, the screen assembly 4 is located inside the support frame 1, and two groups of the adjustment assemblies are respectively located on both sides of the support frame 1 and connected to the support frame 1 and the screen assembly 4.

[0048] Among them, the support frame 1 is a square frame structure used to connect and support the internal screen assembly 4. The bottom of the support frame 1 is connected to the swing seat 2. The swing motor in the swing seat 2 drives the support frame 1 and the screen assembly 4 to swing, thereby vibrating and screening the corn seeds in the screen assembly 4 to improve the screening efficiency.

[0049] The screen assembly 4 includes a first screen plate 41, a second screen plate 42, a third screen plate 43 and a bottom plate 44 from top to bottom, and the first screen plate 41, the second screen plate 42, the third screen plate 43 and the bottom plate 44 are all cylindrical structures with one end open. The left and right sides of the first screen plate 41, the second screen plate 42, the third screen plate 43 and the bottom plate 44 are respectively provided with a rotating shaft 45 and a discharge pipe 46, and the rotating shaft 45 and the discharge pipe 46 are respectively extended out of the support frame 1, wherein the discharge pipe 46 is connected to the inside of the corresponding screen plate or the bottom plate 44, and is used to discharge the corn seeds after each stage of screening.

[0050] The rotating shaft 45 and the discharge pipe 46 are clamped and fixed by an adjusting assembly, which includes two groups of symmetrically arranged screw assemblies 3. The two groups of screw assemblies 3 are respectively located on both sides of the axis of the screen assembly, and the rotating shaft 45 and the discharge pipe 46 are located between the corresponding two groups of screw assemblies 3.

[0051] The screw assembly 3 includes a screw 31, an adjusting nut 32, a support column 34 and a support sheet 33. The adjusting nut 32, the support column 34 and the support sheet 33 are all sleeved on the screw 31. The adjusting nut 32 is threadedly connected to the screw 31, and the support column 34 and the support sheet 33 are slidably connected to the screw 31. The support column 34 is located between the upper and lower adjusting nuts 32, the outer diameter of the support column 34 is smaller than the outer diameter of the adjusting nut 32, the support sheet 33 is located between the adjusting nut 32 and the support column 34, the aperture of the support sheet 33 is smaller than the outer diameter of the support column 34, the support sheets 33 at both ends are supported by the support column 34, and the support sheet 33 is a rectangular structure with rounded corners at one end. By rotating the support sheet 33, the support sheet 33 can be located below the rotating shaft 45 or the discharge pipe 46, so that the rotating shaft 45 or the discharge pipe 46 can be supported by the support sheet 33.

[0052] At the same time, the bottom of the screw rod 31 is fixed to the bottom of the support frame 1, and the top of the screw rod 31 is connected to the top of the support frame 1 by a locking bolt 35. Specifically, the locking bolt 35 passes through the screw rod 31 and the support frame 1 and is then tightened by a nut to ensure that the screw rod 31 and the support frame 1 are connected as a whole. When the locking bolt 35 is removed, the adjustment nut 32, the support plate 33, and the support column 34 can be removed from the top of the screw rod 31, so as to facilitate the installation of the corresponding number of accessories as needed.

[0053] The rotating shaft 45 is located between the two screw rods 31. The upper and lower parts of the rotating shaft 45 are limited by the support sheet 33. At the same time, the two support sheets 33 are supported by the support column 34. The adjusting nut 32 located on one side of the support sheet 33 is used to cooperate with the screw rod 31 to prevent the support sheet 33 from falling by self-locking the thread. At this time, the rotating shaft 45 is completely supported by the support sheet 33, thereby supporting the corresponding sieve plate. At the same time, loosen the adjusting nut 32, and when the support sheet 33 is rotated and does not abut against the rotating shaft 45, the sieve plate can be taken out from the side of the support frame 1 by tilting the sieve plate, which is convenient for replacement at any time.

[0054] By adjusting the locking nuts on the upper and lower sides of the rotating shaft 45 and the discharge pipe 46, the height of the corresponding sieve plate can be adjusted; by rotating the rotating shaft 45 and the discharge pipe 46, the middle sieve plate is driven to rotate, and then the sieve plate can be turned over; by tightening the locking nuts so that the support plate 33 is close to the rotating shaft 45 and the discharge pipe 46, it can be ensured that the rotating shaft 45 and the discharge pipe 46 cannot rotate, and the sieve plate state is maintained. At this time, the sieve plate and the support frame 1 are connected as a whole, and when the support frame 1 vibrates through the rocking seat 2, the sieve plate is driven to vibrate synchronously.

[0055] Continue as Figure 1As shown, the diameter of the first sieve plate 41 is the same as the diameter of the second sieve plate 42, the outer diameter of the third sieve plate 43 is the same as the inner diameter of the second sieve plate 42, and the inner diameter of the bottom plate 44 is larger than the outer diameter of the first sieve plate 41. At this time, a traditional multi-stage screen structure is formed. Since the first sieve plate 41, the second sieve plate 42, the third sieve plate 43 and the bottom plate 44 are staggered and open upward, the first sieve plate 41 is provided with a first sieve hole 411, the second sieve plate 42 is provided with a second plug-in column 421, and the second plug-in column 421 is provided with a through second sieve hole 422, the third sieve plate 43 is provided with a third plug-in column 431, and the third plug-in column 431 is provided with a through third sieve hole 432, the sieve holes of the first sieve plate 41, the second sieve plate 42 and the third sieve plate 43 are reduced in sequence, and the second plug-in column 421 and the third plug-in column 431 are downward at this time, which will not affect the screening of seeds in the sieve plate.

[0056] Seeds larger than the first sieve holes 411 will flow out through the discharge pipe 46 of the first sieve plate 41, and seeds smaller than the first sieve holes 411 will fall into the second sieve plate 42; continue screening, at this time, seeds larger than the second sieve holes 422 will flow out from the discharge pipe 46 corresponding to the second sieve plate 42, and seeds smaller than the second sieve holes 422 will enter the third sieve plate 43; continue screening, seeds larger than the third sieve holes 432 will flow out from the discharge pipe 46 corresponding to the third sieve plate 43, and seeds smaller than the third sieve holes 432 will enter the chassis 44. The distance between adjacent plungers 441 of the chassis 44 is larger than the particle size of the seeds screened, so under the action of swinging vibration, the seeds will not accumulate between the plungers 441 and will flow out from the discharge pipe 46.

[0057] Through the above structure, the swing seat 2 can drive multiple sieve plates to vibrate synchronously to complete multi-level sorting, thereby improving the selection efficiency of corn seeds. At the same time, the distance between adjacent sieve plates can be adjusted by adjusting the components to prevent the seeds screened from the upper sieve plate from popping out of the lower sieve plate.

[0058] Furthermore, a hose 48 is provided outside the discharge pipe 46, and a suction pump is provided at one end of the hose 48, so as to facilitate the collection of seeds screened out from the sieve plate through the suction pump. Meanwhile, the hose 48 facilitates the upside-down adjustment of the sieve plate.

[0059] Embodiment 2:

[0060] Based on implementation 1, see Figure 4-Figure 5 ,

[0061] like Figure 5As shown, the adjusting nuts 32 corresponding to the second sieve plate 42 and the third sieve plate 43 are adjusted to make the distance between the second sieve plate 42 and the third sieve plate 43 appropriate, to ensure that the second sieve plate 42 and the third sieve plate 43 will not collide with the adjacent sieve plates during the flipping process; during the flipping process, the corresponding adjusting nuts 32 are first loosened, and then the rotating shaft 45 and the discharge pipe 46 are rotated to turn the second sieve plate 42 and the third sieve plate 43 over, and then the adjusting nuts 32 are tightened to complete the fixation.

[0062] like Figure 6 As shown, the third sieve plate 43 is moved closer to the second sieve plate 42. Since the outer diameter of the third sieve plate 43 is the same as the inner diameter of the second sieve plate 42, the third sieve plate 43 will be inserted into the second sieve plate 42, and the rotating shaft 45 and the discharge pipe 46 of the third sieve plate 43 will abut against the side wall of the third sieve plate 43.

[0063] like Figure 4 As shown, the second sieve plate 42 and the bottom plate 44 are provided with slots 49 at positions corresponding to the rotating shaft 45 and the discharge pipe 46. Through the slots 49, the rotating shaft 45 and the discharge pipe 46 of the third sieve plate 43 can be inserted into the slots 49 of the second sieve plate 42 to avoid interference, and a slide plate assembly 47 is provided outside the slots 49, and the slots 49 are covered by a baffle 473 to prevent the sieved seeds from falling out of the slots 49 during the process of Example 1. In this embodiment, after the rotating shaft 45 and the discharging pipe 46 of the third sieve plate 43 abut against one end of the baffle plate 473, the baffle plate 473 is pushed to compress the spring 472, so that the baffle plate 473 slides along the slide rail 471 to open the slot 49. At this time, the rotating shaft 45 and the discharging pipe 46 of the third sieve plate 43 enter the slot 49. Since the first sieve hole 411, the second sieve hole 422, the third sieve hole 432 and the plunger 441 are on the same axis, the corresponding third plug-in column 431 is inserted into the second sieve hole 422 until the rotating shaft 45 and the discharging pipe 46 of the third sieve plate 43 enter the bottom of the slot 49. At the same time, the third plug-in column 431 is also completely inserted into the second sieve hole 422 and is flush with the second plug-in portion. At this time, the second sieve hole 422 is inserted by the third plug-in column 431, and only the third sieve hole 432 is passed through.

[0064] Then the chassis 44 is moved toward the third sieve plate 43 until the rotating shaft 45 and the discharge pipe 46 of the third sieve plate 43 enter the deepest part of the slot 49 of the chassis 44. At this time, the plunger 441 of the chassis 44 is completely inserted into the third sieve hole 432, and the top of the plunger 441 is flush with the third plug-in column 431. At this time, the third sieve hole 432 is completely blocked by the plunger 441. Then tighten the adjustment nut 32 above the second sieve plate 42 and below the chassis 44 to complete the locking. It can be known that the redundant adjustment nut 32, the support column 34 and the support sheet 33 can be removed from the screw 31.

[0065] At this time Figure 6As shown, only the first sieve plate 41 of the entire screen assembly 4 can be screened. The purpose of this embodiment is to perform screening operation only once. Seeds larger than the first sieve holes 411 flow out from the discharge pipe 46 of the first sieve plate 41. Since the diameter of the bottom plate 44 is larger than the outer diameters of the second sieve plate 42 and the third sieve plate 43, and the second sieve plate 42 and the third sieve plate 43 are blocked, seeds smaller than the first sieve holes 411 fall into the inner circle of the bottom plate 44 along the surfaces of the second sieve plate 42 and the third sieve plate 43, and then enter the discharge pipe 46 with the swinging vibration.

[0066] Embodiment 3:

[0067] On the basis of Example 2, Figure 7 As shown, the second sieve plate 42 is plugged into the first sieve plate 41 to form a passage for the second sieve hole 422 to pass through, and the bottom plate 44 is plugged into the third sieve plate 43 to block the third sieve plate 43. At this time, the swing seat 2 is started, and seeds larger than the second sieve hole 422 will flow out of the discharge pipe 46 of the first sieve plate 41, and seeds smaller than the second sieve hole 422 will fall into the bottom plate 44. This embodiment can directly screen smaller particle sizes according to the variety of corn seeds.

[0068] Embodiment 4:

[0069] On the basis of Example 2, Figure 8 As shown, the first sieve plate 41, the second sieve plate 42 and the third sieve plate 43 are plugged together to form a passage through which only the third sieve hole 432 passes. When the swing seat 2 is started, seeds larger than the third sieve hole 432 flow out from the discharge pipe 46 of the first sieve plate 41, while seeds smaller than the third sieve hole 432 fall into the bottom plate 44. This embodiment can directly screen out the seeds of the smallest size and quickly exclude the corn seeds that are too small.

[0070] Embodiment 5:

[0071] A method for selecting corn seeds comprises the following steps:

[0072] Step 1: According to the corn seed variety, determine how many levels of particle size need to be screened, and determine the size of each level of particle size;

[0073] Step 2: According to the result of step 1, the first sieve plate 41, the second sieve plate 42, the third sieve plate 43 and the bottom plate 44 are combined by adjusting the components to obtain corresponding sieve holes;

[0074] Step 3: Start the swing seat 2, pour the corn seeds to be screened into the first sieve plate 41 and start screening;

[0075] Step 4: Start the suction pump at one end of the discharge pipe 46 to extract the corn seeds screened at each stage;

[0076] Step 5: After the screening is completed, stop the suction pump and the swing seat 2.

[0077] By determining in advance the variety of corn seeds to be screened, the maximum required sieve hole can be determined. At this time, the corresponding sieve hole can be directly combined by adjusting the component and the screen component. At the same time, according to the number of screening levels required, the screen component can be adjusted to form multiple sieve plates for synchronous screening for graded and selected selection.

[0078] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A corn seed selection device, characterized in that: It includes a support frame, a swing seat, a screen assembly and an adjustment assembly, wherein the support frame is located above the swing seat, the screen assembly is located inside the support frame, and two groups of the adjustment assemblies are respectively located on both sides of the support frame and connected to the support frame and the screen assembly; The screen assembly includes a first screen plate, a second screen plate, a third screen plate and a bottom plate from top to bottom, and the first screen plate, the second screen plate, the third screen plate and the bottom plate are provided with a rotating shaft and a discharge pipe on the left and right sides respectively; The adjusting assembly includes two groups of symmetrically arranged screw assemblies, the two groups of screw assemblies are respectively located on both sides of the axis of the screen assembly, the screw assembly includes a screw, an adjusting nut, a support column and a supporting sheet, the rotating shaft and the discharge pipe are respectively extended out of the support frame and clamped and fixed by the two groups of the screw assemblies, the second sieve plate, the third sieve plate and the bottom plate are clamped by the upper and lower groups of adjusting nuts and then move up and down along the screw, and the second sieve plate and the third sieve plate are turned over by the rotating shaft and the discharge pipe; The sieve holes of the first sieve plate, the second sieve plate and the third sieve plate are reduced in sequence, the first sieve plate, the second sieve plate, the third sieve plate and the bottom plate are plugged in and matched in sequence, and the first sieve plate, the second sieve plate and the third sieve plate are plugged in to form sieve holes of different apertures; The first sieve plate has a plurality of first sieve holes in a circumferential array at the bottom; A second plug-in column is provided at a position of the second sieve plate corresponding to the first sieve hole, the second plug-in column is plugged and matched with the first sieve hole, a second sieve hole is provided in the second plug-in column, and the second sieve hole is connected to the bottom of the second sieve plate; A third plug-in column is provided at a position of the third sieve plate corresponding to the second sieve hole, the third plug-in column is plugged and matched with the second sieve hole, a third sieve hole is provided in the third plug-in column, and the third sieve hole is connected to the bottom of the third sieve plate; A plunger is provided at a position of the chassis corresponding to the third sieve hole, and the plunger is plugged and matched with the third sieve hole; The first sieve plate, the second sieve plate, the third sieve plate and the bottom plate are all cylindrical structures with one end open. The second plug-in column and the third plug-in column are respectively located on the outer side of the corresponding sieve plate. The length of the second plug-in column is adapted to the depth of the first sieve hole. The length of the third plug-in column is greater than the depth of the second sieve hole. The length of the plunger is greater than the depth of the third sieve hole.

2. The corn seed selection device according to claim 1, characterized in that: The diameter of the first sieve plate is the same as the diameter of the second sieve plate, the outer diameter of the third sieve plate is the same as the inner diameter of the second sieve plate, and the inner diameter of the bottom plate is larger than the outer diameter of the first sieve plate.

3. The corn seed selection device according to claim 1, characterized in that: The rotating shaft and the discharge pipe are symmetrically located on both sides of the bottom of the corresponding sieve plate or chassis, and the discharge pipe is connected to the inside of the corresponding sieve plate or chassis.

4. The corn seed selection device according to claim 1, characterized in that: The side walls of the second sieve plate and the chassis are provided with slots corresponding to the positions of the rotating shaft and the discharge pipe, and a slide plate assembly is provided outside the slot, and the slide plate assembly includes a slide rail, a baffle and a spring. The two slide rails are respectively located on both sides of the slot, and the baffle is slidably connected to the slide rails. One end of the spring is connected to the baffle, and the other end of the spring is connected to the outer wall of the disc body. The size of the baffle is larger than the size of the slot.

5. The corn seed selection device according to claim 1, characterized in that: The support column is sleeved on the screw rod, and the support column is located between the upper and lower adjusting nuts. The outer diameter of the support column is smaller than the outer diameter of the adjusting nut. The support plate is sleeved on the screw rod, and the support plate is located between the adjusting nut and the support column. The aperture of the support plate is smaller than the outer diameter of the support column, and the support plate is a rectangular structure with rounded corners at one end.

6. The corn seed selection device according to claim 1, characterized in that: The support frame is a square frame structure, the bottom of the screw rod is fixed to the bottom of the support frame, a locking bolt is provided between the top of the screw rod and the top of the support frame, and the locking bolt passes through the screw rod and the support frame.

7. The corn seed selection device according to claim 1, characterized in that: A hose is arranged outside the discharge pipe, and a suction pump is arranged at the other end of the hose.

8. The method for selecting corn seeds according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: According to the corn seed variety, determine how many levels of particle size need to be screened, and determine the size of each level of particle size; Step 2: According to the result of step 1, the first sieve plate, the second sieve plate, the third sieve plate and the bottom plate are combined by adjusting the components to obtain corresponding sieve holes; Step 3: Start the swing seat, pour the corn seeds to be screened into the first sieve plate and start screening; Step 4: Start the suction pump at one end of the discharge pipe to extract the corn seeds screened at each stage; Step 5: After the screening is completed, stop the suction pump and the swing seat.

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