Brassica vegetable seed screening device

Abstract

The invention relates to the technical field of vegetable seed screening, in particular to a brassica vegetable seed screening device which comprises a rack, a seed screening box is arranged on the rack, and a feeding window is formed in the upper end of the side wall of the seed screening box. A stirring mechanism for layering empty shell seeds and full seeds is arranged at the bottom end in the seed screening box, a fan for blowing away the empty shell seeds is arranged at the top end in the seed screening box, and a driving mechanism for providing kinetic energy for the stirring mechanism and the fan is arranged on one side of the seed screening box; the upper end of one side of the seed screening box is connected with an empty shell wind removing mechanism, and the driving mechanism comprises a stepping motor fixedly installed on one side of the lower end of the rack. The problems that a small amount of empty-shell seeds are doped in the seeds in a full area after screening, and a small amount of full seeds exist in an empty-shell seed area exist in the prior art exist.

Description

Technical Field

[0001] The invention relates to the technical field of vegetable seed screening, and more specifically, to a device for screening Brassica vegetable seeds. Background Art

[0002] As an annual or biennial herbaceous plant of the cruciferous family, Brassica vegetables are widely planted in southern and northern China and are important vegetables in various places. Since the quality of Brassica vegetable seeds directly affects the planting effect and final yield of vegetables, it is particularly important to screen Brassica vegetable seeds efficiently.

[0003] At present, the screening of Brassica vegetable seeds generally adopts a vibration screening machine to screen the full and empty seeds through vibration. The vibration screening machine uses mechanical vibration to make the seeds roll and jump on the screen. According to the different weight characteristics of the seeds, the full seeds and the empty seeds are separated. Although the two can be distinguished to a certain extent, the screening result is not ideal. After screening, there is a small amount of empty seeds mixed in the seeds in the full area, and a small amount of full seeds in the empty seed area. In order to solve the above problems, a Brassica vegetable seed screening device is proposed. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the problems existing in the prior art, the present invention provides a Brassica vegetable seed screening device to solve the problem mentioned in the background technology that after the Brassica vegetable seeds are currently screened by a vibration screening machine for full and empty seeds, there is a small amount of empty seeds mixed in the full area after screening, while a small amount of full seeds remain in the empty seed area.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a Brassica vegetable seed screening device, comprising a frame, a seed screening box is arranged on the frame, and a feeding window is arranged at the upper end of the side wall of the seed screening box, a stirring mechanism for stratifying empty shell seeds and full seeds is arranged at the bottom end of the inside of the seed screening box, and a fan for blowing away the empty shell seeds is arranged at the top end of the inside of the seed screening box, a driving mechanism for providing kinetic energy to the stirring mechanism and the fan is arranged on one side of the seed screening box, and an empty shell wind removal mechanism is connected to the upper end of one side of the seed screening box, the driving mechanism comprises a stepping motor fixedly mounted on one side of the lower end of the frame, and also comprises a transmission rod arranged on the output shaft of the stepping motor, and a first gear and a second gear arranged at the upper and lower ends of the transmission rod. The stirring mechanism includes a stirring member arranged in the seed screening box, a driving rod arranged on the stirring member, and a third gear arranged on the driving rod, the first gear and the third gear are meshed and rotated, and the gear ratio of the first gear and the third gear is 2:1, the rotating shaft of the fan passes through the top of the seed screening box and is connected to a fourth gear, and the fourth gear and the second gear are meshed and rotated, the diameter of the second gear is larger than the diameter of the fourth gear, the first gear and the second gear are only provided with a half-circle tooth block, and when the tooth block on the first gear is meshed with the third gear, the tooth block on the second gear is disengaged from the fourth gear, and when the tooth block on the first gear is disengaged from the third gear, the tooth block on the second gear is meshed with the fourth gear.

[0008] The present invention is further configured such that the side wall at the lower end of the seed screening box is configured as a spherical arc surface, and a feed opening is provided at the bottom end of the seed screening box, a blocking block is provided at the top end of the third gear, and the blocking block corresponds to and matches the feed opening.

[0009] The present invention is further configured such that the stirring member includes a sleeve sleeved on the driving rod, stirring rods arranged in an annular array on the outer wall of the sleeve, and right-angle grooves opened on the stirring rods.

[0010] The present invention is further configured such that the stirring rod matches and fits the spherical arc inner wall of the lower end of the seed screening box and the top of the blocking block, a limit strip is provided on the circumferential inner wall of the seed screening box, and the bottom end of the limit strip abuts against the top of the stirring rod.

[0011] The present invention is further configured such that a disc is rotatably mounted on the bottom end of the third gear, and a connecting rod is rotatably mounted on the bottom end of the disc through a rotating ear, a rotating sleeve is sleeved on the connecting rod, an electric telescopic rod is fixedly mounted on the side of the lower end of the frame away from the stepping motor, and the telescopic end of the electric telescopic rod is fixedly connected to the rotating sleeve.

[0012] The present invention is further configured such that the driving rod is a square column, and an anti-dropping block is welded to one end of the driving rod away from the third gear.

[0013] The present invention is further configured such that the seed screening box is made of a transparent light-transmitting material, and a visual sensor is provided on an inner wall of the seed screening box.

[0014] The present invention is further configured such that the empty shell wind removal mechanism includes a shell suction tube connected to the upper end of one side of the seed screening box, and the end of the shell suction tube connected to the seed screening box is connected to an empty shell collection box, and the top of the empty shell collection box is connected to a negative pressure air pump through an air duct.

[0015] The present invention is further configured such that a discharge gate valve is provided at one side of the bottom end of the empty shell collection box.

[0016] The present invention is further configured such that a control host is fixedly mounted on an upper end of one side of the frame, and the control host is electrically connected to the stepping motor, the electric telescopic rod, the visual sensor and the negative pressure air pump.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a Brassica vegetable seed screening device having the following features:

[0019] Beneficial effects:

[0020] 1. The present invention rotates one circle through the stepper motor. The first half circle of rotation realizes the stirring and stratification of seeds by the stirring member through the meshing of the first gear and the third gear, so that the empty shell seeds are located above the full seeds. The second half circle of rotation drives the fan to rotate to generate wind force through the meshing of the second gear and the fourth gear, thereby blowing up the empty shell seeds located on the upper layer. Finally, the flying empty shell seeds are removed by the empty shell wind removal mechanism. Therefore, the full seeds and the empty shell seeds are screened through the continuous rotation of the stepper motor, and it is avoided that the full seeds are mixed with the removed empty shell seeds, resulting in the waste of the full seeds.

[0021] 2. The present invention is provided with a visual sensor. Under the continuous rotation of the stepper motor, when the seeds after stirring and stratification cannot be blown up by the fan, the visual sensor cannot detect the flying empty shell seeds, which means that the seeds have completed the screening of full and empty shells, thus avoiding the mixing of empty shell seeds in the full seeds after screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a Brassica vegetable seed screening device.

[0023] Figure 2 This is a schematic diagram of the overall structure of the Brassica vegetable seed screening device from another perspective.

[0024] Figure 3 This is a schematic diagram of the internal structure of a seed screening box of a Brassica vegetable seed screening device.

[0025] Figure 4 The present invention is a structural schematic diagram of a Brassica vegetable seed screening device in which a blocking block is moved downward to open a feed outlet at the bottom end of a seed screening box.

[0026] Figure 5 The present invention is a schematic diagram of a connecting rod driving structure for moving a blocking block downward in a Brassica vegetable seed screening device.

[0027] Figure 6 The present invention is a schematic diagram of the meshing state structure between the second gear and the fourth gear when the first gear and the third gear in the Brassica vegetable seed screening device are meshed and rotated.

[0028] In the figure: 1. frame; 2. seed screening box; 3. feeding window; 4. stirring mechanism; 401. driving rod; 402. third gear; 5. fan; 6. driving mechanism; 601. stepping motor; 602. transmission rod; 603. first gear; 604. second gear; 7. empty shell wind removal mechanism; 701. shell suction pipe; 702. empty shell collection box; 703. negative pressure air pump; 704. discharge gate valve; 8. stirring element; 801. sleeve; 802. stirring rod; 803. right angle groove; 9. fourth gear; 10. discharge port; 11. blocking block; 12. limit strip; 13. disc; 14. connecting rod; 15. rotating sleeve; 16. electric telescopic rod; 17. anti-falling block; 18. visual sensor; 19. control host. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0031] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0032] For examples, see Figure 1 - Figure 6A device for screening seeds of Brassica vegetables comprises a frame 1, a seed screening box 2 is arranged on the frame 1, and a feeding window 3 is arranged on the upper end of the side wall of the seed screening box 2, a stirring mechanism 4 for stratifying empty shell seeds and full seeds is arranged at the bottom end of the inside of the seed screening box 2, and a fan 5 for blowing away the empty shell seeds is arranged at the top of the inside of the seed screening box 2, a driving mechanism 6 for providing kinetic energy to the stirring mechanism 4 and the fan 5 is arranged on one side of the seed screening box 2, and an empty shell wind removal mechanism 7 is connected to the upper end of one side of the seed screening box 2, the frame 1 is welded by multiple angle irons, and a convex piece is arranged on the circumferential outer wall of the seed screening box 2, and the angle iron of the frame 1 supports the seed screening box 2 through the convex piece, and then is fixed by fixing bolts, thereby completing the installation of the seed screening box 2.

[0033] When screening the seeds, first open the feed window 3 at the upper end of the side wall of the seed screening box 2, then pour the vegetable seeds to be screened into the cavity of the seed screening box 2, and then close the feed window 3, and the driving mechanism 6 drives the stirring mechanism 4 to rotate. When the stirring mechanism 4 rotates, it stirs the seeds to be screened in the seed screening box 2. When the seeds are stirred by the stirring mechanism 4, the full seeds are heavier than the empty shell seeds and are easier to move downward, so that the empty shell seeds are squeezed upward to the upper layer of the seeds, and then the driving mechanism 6 drives the fan 5 to rotate to generate wind force, blowing the empty shell seeds on the upper layer, so that the empty shell seeds fly in the cavity of the seed screening box 2, and start the empty shell wind removal mechanism 7 to vacuum the flying empty shell seeds, and then repeat the cycle to achieve the screening of empty shell seeds and full seeds in the seed screening box 2.

[0034] The driving mechanism 6 includes a stepper motor 601 fixedly mounted on one side of the lower end of the frame 1, a transmission rod 602 arranged on the output shaft of the stepper motor 601, and a first gear 603 and a second gear 604 arranged at the upper and lower ends of the transmission rod 602;

[0035] The stirring mechanism 4 includes a stirring member 8 disposed in the seed screening box 2, a driving rod 401 disposed on the stirring member 8, and a third gear 402 disposed on the driving rod 401;

[0036] The first gear 603 and the third gear 402 are meshed and rotated, and the gear ratio of the first gear 603 and the third gear 402 is 2:1;

[0037] The rotating shaft of the fan 5 passes through the top of the seed screening box 2 and is connected to a fourth gear 9, and the fourth gear 9 and the second gear 604 are meshed and rotated, and the diameter of the second gear 604 is larger than the diameter of the fourth gear 9;

[0038] Only half a circle of tooth blocks are provided on the first gear 603 and the second gear 604, and when the tooth block on the first gear 603 is engaged with the third gear 402, the tooth block on the second gear 604 is disengaged from the fourth gear 9; when the tooth block on the first gear 603 is disengaged from the third gear 402, the tooth block on the second gear 604 is engaged with the fourth gear 9.

[0039] In this embodiment, the stepper motor 601 drives the transmission rod 602 to rotate through the output shaft, thereby driving the first gear 603 and the second gear 604 at the upper and lower ends of the transmission rod 602 to rotate. When the first gear 603 rotates, it engages the third gear 402 through a half-circle tooth block. Since the gear ratio of the first gear 603 and the third gear 402 is 2:1, the stirring member 8 will be driven to rotate one circle to stir the seeds in the inner cavity of the seed screening box 2, so that the full seeds move down and the empty seeds move up, thereby performing staged stratification. When the transmission rod 602 rotates half a circle, the stirring member 8 rotates one circle to complete the staged stratification, and then the tooth block on the first gear 603 is disengaged from the third gear 402, and the stirring member 8 no longer rotates to perform the seed stratification operation. When the tooth block on the first gear 603 is disengaged from the third gear 402, the second The tooth block on the gear 604 is meshed with the fourth gear 9, so that the fourth gear 9 is driven by the tooth block on the second gear 604 to drive the fan 5 to rotate, wherein the diameter of the second gear 604 is larger than the diameter of the fourth gear 9, so that when the tooth block of the upper half circle of the second gear 604 drives the fourth gear 9, the fourth gear 9 will rotate multiple circles. Therefore, the larger the diameter ratio of the second gear 604 and the fourth gear 9, the better. The larger the diameter ratio, the faster the rotation speed of the fourth gear 9, so that a larger wind force can be generated, which can blow up the empty shell seeds on the upper layer. After being blown up by the fan 5, the empty shell seeds will fly in the cavity of the seed screening box 2, and then be sucked away by the empty shell wind removal mechanism 7 on one side of the seed screening box 2. The above operation is repeated, so that after multiple stage-by-stage stratification and the empty shell seeds are blown up and sucked away, the empty shell seeds and the full seeds are screened.

[0040] The side wall at the lower end of the seed screening box 2 is arranged in a spherical arc surface, so that when the stirring member 8 rotates to stir and stratify the seeds, the stirred seeds will slide downward along the spherical arc surface at the lower end of the seed screening box 2, thereby increasing the movement amplitude of the seeds, that is, during the movement of the seeds, more full seeds move downward, and the number of empty shell seeds squeezed upward is also increased, thereby improving the efficiency of staged stratification, and a feeding port 10 is provided at the bottom end of the seed screening box 2, and a blocking block 11 is provided at the top of the third gear 402. The sealing block 11 and the discharge port 10 are matched with each other. After the seeds in the seed screening box 2 are screened into full and empty shells, the empty shell seeds are sucked away by the empty shell wind removal mechanism 7. Therefore, the seeds left in the seed screening box 2 are full seeds. At this time, the sealing block 11 is moved downward to open the discharge port 10, and the full seeds in the seed screening box 2 are discharged from the discharge port 10 along the spherical arc surface at the lower end of the seed screening box 2. It should be noted that before discharging the full seeds in the seed screening box 2, a receiving basin should be placed under the discharge port 10.

[0041] The stirring member 8 includes a sleeve 801 sleeved on the driving rod 401 , stirring rods 802 arranged in an annular array on the outer wall of the sleeve 801 , and right-angle grooves 803 opened on the stirring rods 802 .

[0042] The stirring rod 802 matches and fits the spherical arc inner wall at the lower end of the seed screening box 2 and the top of the blocking block 11;

[0043] A limit strip 12 is provided on the inner circumferential wall of the seed screening box 2 , and the bottom end of the limit strip 12 abuts against the top end of the stirring rod 802 .

[0044] Furthermore, the stirring member 8 is limited by the limit bar 12 and the spherical arc surface at the lower end of the seed screening box 2, and the stirring rod 802 fits the spherical arc surface, so that the seeds at the inner and outer edges of the seed screening box 2 can participate in the stirring. If the stirring rod 802 does not fit the spherical arc surface at the lower end of the seed screening box 2, then during stirring, the seeds at the inner and outer edges of the seed screening box 2 will always be located on the outside, and will not be mixed, stirred and stratified toward the seeds in the center, resulting in the empty shells on the outer edge being difficult to move up to the top of the seeds to be blown up by the fan 5, and then sucked away by the empty shell wind removal mechanism 7.

[0045] It should be noted that the direction in which the right-angle groove 803 is opened is the same as the direction in which the stirring rod 802 rotates, so that when the stirring rod 802 rotates, it is the straight surface that fits the inner wall of the seed screening box 2 that pushes the seeds to stir, rather than the curved surface of the stirring rod 802. If the stirring rod 802 is designed as a round rod, the curved stirring rod 802 that fits the inner wall of the seed screening box 2 will squeeze the seeds, thereby causing damage to the seeds.

[0046] The empty shell wind removal mechanism 7 includes a shell suction tube 701 connected to the upper end of one side of the seed screening box 2, and the end of the shell suction tube 701 connected to the empty shell collection box 702 away from the seed screening box 2 is connected, the top of the empty shell collection box 702 is connected to a negative pressure air pump 703 through an air duct, and a discharge gate valve 704 is provided on one side of the bottom end of the empty shell collection box 702.

[0047] After the negative pressure air pump 703 is started, negative pressure is generated, so that the shell suction pipe 701 sucks out the empty shell seeds flying in the seed screening box 2. The sucked out empty shell seeds fall into the empty shell collection box 702. After the seed screening is completed, the unloading gate valve 704 is opened to take out the empty shell seeds deposited in the empty shell collection box 702. It should be noted that the negative pressure air pump 703 is connected to the empty shell collection box 702 through an air duct and a filter is provided at one end to prevent the empty shell seeds from entering the negative pressure air pump 703 and causing damage to the negative pressure air pump 703.

[0048] A disc 13 is rotatably mounted on the bottom end of the third gear 402, and a connecting rod 14 is rotatably mounted on the bottom end of the disc 13 through a rotating ear, and a rotating sleeve 15 is sleeved on the connecting rod 14;

[0049] An electric telescopic rod 16 is fixedly mounted on one side of the lower end of the frame 1 away from the stepping motor 601 , and the telescopic end of the electric telescopic rod 16 is fixedly connected to the rotating sleeve 15 .

[0050] After the empty shell seeds in the seed screening box 2 are sucked away by the empty shell wind removal mechanism 7, only full and high-quality seeds are left in the seed screening box 2. At this time, the electric telescopic rod 16 drives the connecting rod 14 to move by contraction, so that the blocking block 11, the third gear 402 and the disc 13 move downward under the action of gravity to open the discharge port 10 of the seed screening box 2, so that the screened high-quality seeds are discharged from the discharge port 10 and fall into the pre-placed receiving basin. After the full seeds are discharged, the electric telescopic rod 16 extends and pushes the connecting rod 14 until the connecting rod 14 is in a vertical state, so that the blocking block 11 moves upward, thereby blocking the discharge port 10.

[0051] The driving rod 401 is a square column, and an anti-slip block 17 is welded to one end of the driving rod 401 away from the third gear 402. When the blocking block 11 moves down to open the discharge port 10, the blocking block 11 drives the driving rod 401 to slide downward along the sleeve 801. The setting of the anti-slip block 17 prevents the driving rod 401 from moving down and falling off the sleeve 801.

[0052] The seed screening box 2 is made of transparent light-transmitting material, and a visual sensor 18 is arranged on the inner wall of the seed screening box 2. The seed screening box 2 is arranged by transparent light-transmitting material so that its interior always keeps bright, thereby providing a good visual observation effect for the visual sensor 18. The visual sensor 18 monitors the flying empty shell seeds in the seed screening box 2. As long as the seed screening box 2 detects the flying empty shell seeds, the stepper motor 601 continues to rotate and performs stirring and stratification screening again until the visual sensor 18 can no longer detect the flying empty shell seeds in the seed screening box 2, which means that the screening of full seeds and empty shell seeds is completed.

[0053] A control host 19 is fixedly mounted on the upper end of one side of the frame 1 , and the control host 19 is electrically connected to the stepping motor 601 , the electric telescopic rod 16 , the visual sensor 18 and the negative pressure air pump 703 .

[0054] The control host 19 controls the stepper motor 601 to rotate, firstly drives the third gear 402 to rotate through the first gear 603, thereby driving the upper blocking block 11 and the driving rod 401 to rotate, and the square driving rod 401 drives the stirring member 8 to rotate, so that the seeds in the seed screening box 2 are layered in stages, so that the full seeds move down and the empty shell seeds fall on the upper layer. As the stepper motor 601 continues to rotate, the stirring member 8 stops stirring, and the second gear 604 drives the fourth gear 9 to rotate, so that the fan 5 rotates quickly to blow the empty shell seeds falling on the upper layer. It should be noted that the seeds poured into the seed screening box 2 to be screened The amount of seeds to be sorted cannot exceed the height of the limit bar 12. The empty shell seeds on the upper layer fly under the blowing of the fan 5. The control host 19 starts the negative pressure air pump 703, and the flying empty shell seeds are sucked into the empty shell collection box 702 through the shell suction pipe 701 by negative pressure. After multiple stage-by-stage stratified screening, the number of empty shell seeds flying in the seed screening box 2 becomes less and less, until the visual sensor 18 can no longer detect the flying empty shell seeds, the control host 19 turns off the negative pressure air pump 703 and the stepper motor 601, and controls the electric telescopic rod 16 to contract, opens the discharge port 10 of the seed screening box 2, and discharges the screened full seeds.

[0055] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which are not described one by one here. In the above, welding is preferred for all fixed connections. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and deformations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A Brassica vegetable seed screening device, comprising a frame (1), characterized in that: The frame (1) is provided with a seed screening box (2), and a feeding window (3) is provided at the upper end of the side wall of the seed screening box (2); a stirring mechanism (4) for separating empty shell seeds and full shell seeds is provided at the bottom end of the seed screening box (2), and a fan (5) for blowing away the empty shell seeds is provided at the top end of the seed screening box (2); a driving mechanism (6) for providing kinetic energy to the stirring mechanism (4) and the fan (5) is provided at one side of the seed screening box (2), and an empty shell wind removal mechanism (7) is connected to the upper end of one side of the seed screening box (2); The driving mechanism (6) comprises a stepping motor (601) fixedly mounted on one side of the lower end of the frame (1), a transmission rod (602) arranged on the output shaft of the stepping motor (601), and a first gear (603) and a second gear (604) arranged at the upper and lower ends of the transmission rod (602); The stirring mechanism (4) comprises a stirring member (8) arranged in the seed screening box (2), a driving rod (401) arranged on the stirring member (8), and a third gear (402) arranged on the driving rod (401); The first gear (603) and the third gear (402) are meshed and rotated, and the gear ratio between the first gear (603) and the third gear (402) is 2:1; The rotating shaft of the fan (5) passes through the top of the seed screening box (2) and is connected to a fourth gear (9), and the fourth gear (9) and the second gear (604) are meshed and rotated, and the diameter of the second gear (604) is greater than the diameter of the fourth gear (9); The first gear (603) and the second gear (604) are each provided with only a half-circle tooth block, and when the tooth block on the first gear (603) is meshed with the third gear (402), the tooth block on the second gear (604) is in a disengaged state from the fourth gear (9); and when the tooth block on the first gear (603) is disengaged from the third gear (402), the tooth block on the second gear (604) is meshed with the fourth gear (9).

2. The Brassica vegetable seed screening device according to claim 1, characterized in that: The side wall at the lower end of the seed screening box (2) is arranged in a spherical arc surface, and a feeding port (10) is provided at the bottom end of the seed screening box (2); A blocking block (11) is provided at the top end of the third gear (402), and the blocking block (11) and the feed opening (10) are matched with each other.

3. The Brassica vegetable seed screening device according to claim 2, characterized in that: The stirring member (8) comprises a sleeve (801) sleeved on the driving rod (401), stirring rods (802) arranged in an annular array on the outer wall of the sleeve (801), and right-angle grooves (803) opened on the stirring rods (802).

4. The Brassica vegetable seed screening device according to claim 3, characterized in that: The stirring rod (802) matches and fits the spherical arc inner wall at the lower end of the seed screening box (2) and the top of the blocking block (11); A limit strip (12) is provided on the circumferential inner wall of the seed screening box (2), and the bottom end of the limit strip (12) abuts against the top end of the stirring rod (802).

5. The Brassica vegetable seed screening device according to claim 4, characterized in that: A disc (13) is rotatably mounted on the bottom end of the third gear (402), and a connecting rod (14) is rotatably mounted on the bottom end of the disc (13) via a rotating ear, and a rotating sleeve (15) is sleeved on the connecting rod (14); An electric telescopic rod (16) is fixedly mounted on a side of the lower end of the frame (1) away from the stepping motor (601), and the telescopic end of the electric telescopic rod (16) is fixedly connected to the rotating sleeve (15).

6. The Brassica vegetable seed screening device according to claim 5, characterized in that: The driving rod (401) is a square column, and an anti-dropping block (17) is welded to one end of the driving rod (401) away from the third gear (402).

7. The Brassica vegetable seed screening device according to claim 6, characterized in that: The seed screening box (2) is made of transparent light-transmitting material, and a visual sensor (18) is arranged on the inner wall of the seed screening box (2).

8. The Brassica vegetable seed screening device according to claim 7, characterized in that: The empty shell wind removal mechanism (7) comprises a shell suction pipe (701) connected to the upper end of one side of the seed screening box (2), and the end of the shell suction pipe (701) connected to the empty shell collection box (702) away from the seed screening box (2), and the top of the empty shell collection box (702) is connected to a negative pressure air pump (703) through an air duct.

9. The Brassica vegetable seed screening device according to claim 8, characterized in that: A discharge gate valve (704) is provided at one side of the bottom end of the empty shell collection box (702).

10. The Brassica vegetable seed screening device according to claim 9, characterized in that: A control host (19) is fixedly mounted on the upper end of one side of the frame (1), and the control host (19) is electrically connected to the stepping motor (601), the electric telescopic rod (16), the visual sensor (18) and the negative pressure air pump (703).

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