Pre-screening device before corn seed coating

Abstract

The utility model relates to the field of seed processing, in particular to a pre-screening device before corn seed coating, which comprises a screening bin and a screening component mounted in the screening bin, the screening component comprises a primary screening component and a secondary screening component, an inclined conveying belt is arranged in the primary screening component, and the secondary screening component is arranged in the secondary screening component. The secondary screening assembly comprises a first screen arranged in an inclined mode and a second screen arranged in an inclined mode. According to the corn seed screening device, round-particle seeds and flat-particle seeds can be screened and separated through the inclined conveying belt according to the shapes of corn seeds, large-particle seeds and small-particle seeds can be screened and separated through the screen, and the seeds with more consistent shapes and particle sizes are selected subsequently for coating; and the seed coating uniformity is improved.

Description

Technical Field

[0001] This utility model relates to the field of seed processing, and in particular to a pre-screening device for corn seeds before coating. Background Technology

[0002] Before sowing, a protective layer is formed by evenly covering the seed surface with a "coating agent" composed of film-forming agents, fertilizers, pesticides, and microorganisms, which enhances the seed's resistance to stress and promotes germination. In order to ensure the stability of the seed quality used for sowing, it is necessary to select excellent and plump seeds for coating before coating.

[0003] Currently, Chinese patent application with publication number CN 206353945 U and publication date of July 28, 2017, discloses a seed screening and coating device, including a screening device and a coating device. The screening device includes a screening box and a belt. One end of the bottom of the screening box is provided with a primary support frame that mates with the outer periphery of the screening box, and the other end is provided with a secondary support frame that mates with the outer periphery of the screening box. A primary motor is provided on the side wall of the screening box. A lead screw is provided on the output shaft of the primary motor. The lead screw has threads with opposite helical directions on both sides of the center. A primary push plate is provided on the end of the lead screw away from the primary motor, and a secondary push plate is provided on the end of the lead screw closer to the primary motor.

[0004] In use, the secondary motor drives the primary shaft to rotate, which in turn drives the screening box to rotate via a belt, and the seeds are screened through the filter holes on the screening box.

[0005] Corn seeds vary greatly in shape. When coating corn seeds, it is important to control the uniformity of seed size and shape to ensure more even coating and improve the coating effect. However, the aforementioned techniques only allow smaller seeds to be selected during seed screening, making it impossible to control the uniformity of corn seed size and shape. This can negatively impact the coating effect in subsequent coating processes. Utility Model Content

[0006] In order to improve the consistency of the size and shape of the seeds obtained from screening and enhance the quality of the seeds obtained from screening, this utility model provides a pre-screening device for corn seeds before coating.

[0007] This utility model provides a pre-screening device for corn seeds before coating, which adopts the following technical solution:

[0008] The application discloses a corn seed pre-screening device before coating, which comprises a screening bin, a screening assembly is arranged in the screening bin, and the screening assembly comprises a primary screening assembly and a secondary screening assembly.

[0009] By adopting the technical scheme, the seeds enter the screening bin from the feeding port above the screening bin and fall on the conveying belt, the conveying belt is arranged in an inclined manner and conveys upwards, so that the round and smooth corn seeds fall on the conveying belt and roll downwards along the conveying belt and fall in the second collecting bin, the flat seeds roll upwards along the conveying belt and fall in the first collecting bin after reaching the uppermost position, so that the round and smooth seeds and the flat seeds are screened; the round and smooth seeds fall in the second collecting bin and roll downwards along the first screen, since the first screen has screen holes, the round and smooth seeds with small particles fall through the screen holes of the first screen and are collected in the first collecting groove, and the round and smooth seeds with large particles roll downwards on the first screen and are collected in the second collecting groove at the lower end of the first screen; the flat seeds fall in the first collecting bin and roll downwards along the second screen, and the flat seeds with small particles fall through the screen holes of the second screen and are collected in the third collecting groove, and the flat seeds with large particles roll downwards along the second screen and fall in the fourth collecting groove at the lower end of the second screen. In this way, the round and smooth seeds and the flat seeds can be screened according to the shape of the corn seeds, the seeds with large particles and the seeds with small particles can be screened through the screens, and then the round and smooth seeds, the flat seeds, the seeds with large particles and the seeds with small particles can be screened more accurately, and the seeds with more uniform shape and particle size can be selected for coating, so that the uniformity of seed coating is improved, and the seed coating effect is improved.

[0010] Optionally, the first screen and the second screen are further provided with an adjusting assembly at the bottom, the adjusting assembly comprises a sliding rail fixedly arranged at the bottom of the first screen and the second screen, an adjusting plate slidably arranged on the sliding rail, the adjusting plate is arranged close to the first screen and the second screen, and a plurality of leakage holes are arranged on the adjusting plate; and a fastener is arranged on the sliding rail and abuts against the adjusting plate, and the fastener is used for fixing the adjusting plate.

[0011] By adopting the above technical scheme, before the first screen or the second screen is used, the adjusting plate is first pulled to slide on the sliding rail, the size of the screen holes of the first screen and the second screen is adjusted by adjusting the coincidence degree of the leakage holes on the adjusting plate and the screen holes on the first screen and the second screen, so that the size of the seeds screened by the first screen and the second screen is controlled, and after the size of the screen holes of the first screen and the second screen is adjusted, the fastener is used to abut the adjusting plate in the sliding rail to fix the adjusting plate. In this way, the size of the seeds screened by the first screen and the second screen can be adjusted by adjusting the position of the adjusting plate, and the size of the screened seeds is adjusted.

[0012] Optionally, the secondary screening assembly further comprises: a first flow limiting plate, the first flow limiting plate is fixedly arranged above the first screen, and a flow gap is formed between the first flow limiting plate and the first screen; and a second flow limiting plate, the second flow limiting plate is fixedly arranged above the second screen, and a flow gap is formed between the second flow limiting plate and the second screen.

[0013] By adopting the above technical scheme, when the seeds roll down on the first screen and the second screen, the seeds with small particles may be wrapped by the seeds with large particles due to the accumulation of the seeds or the too fast rolling speed of the seeds, and fall on the end with low position of the first screen and the second screen, affecting the screening quality. By adopting this technical scheme, the first flow limiting plate is fixedly installed above the first screen, and the second flow limiting plate is fixedly installed above the second screen, so that the seeds roll down from the flow gap between the first flow limiting plate and the first screen and the flow gap between the second flow limiting plate and the second screen, respectively, which can effectively slow down the rolling speed of the seeds downward, and further reduce the probability that the seeds with small particles roll down to the bottom of the first screen and the second screen together with the seeds with large particles, thereby improving the screening quality of the seeds with large particles and the seeds with small particles.

[0014] Optionally, a baffle is further fixedly arranged above the conveying belt, the baffle is arranged on the side of the feeding port of the screening bin close to the side with high position of the conveying belt, the baffle is arranged along the width direction of the conveying belt, and a gap is left between the baffle and the conveying belt.

[0015] By adopting the above technical scheme, after the seeds fall on the conveying belt, the seeds will accumulate on the conveying belt, causing the round particle seeds and the flat particle seeds to accumulate together, and further causing the round particle seeds to be blocked by the flat particle seeds and unable to roll to the end with low position of the conveying belt, affecting the separation of the round particle seeds and the flat particle seeds. By adopting this technical scheme, after the seeds fall on the conveying belt, the seeds will pass through the gap between the baffle and the conveying belt under the blocking of the baffle, flatten the seeds on the conveying belt, and reduce the probability of accumulation of the seeds on the conveying belt.

[0016] Optionally, a pushing plate is further fixedly arranged on the baffle, the pushing plate is fixedly arranged on the side of the baffle close to the side with high position of the conveying belt, a plurality of pushing pieces are arranged on the end of the pushing plate close to the conveying belt, a gap is left between the pushing pieces, the pushing pieces are arranged along the width direction of the conveying belt, and the pushing pieces are used to push the seeds on the conveying belt to move to both sides.

[0017] By adopting the technical scheme, after the seeds are flattened by the baffle on the conveying belt, the flat granular seeds may block the side of the round granular seeds close to the low end of the conveying belt, causing the round granular seeds to fail to roll down along the conveying belt, affecting the separation of the round granular seeds and the flat granular seeds. By adopting the technical scheme, when the seeds move on the conveying belt to the position of the baffle, the seeds on the conveying belt will contact the baffle and be pushed to both sides by the baffle, thereby causing the round granular seeds to displace to both sides, reducing the probability that the flat granular seeds block the side of the round granular seeds, causing the round granular seeds to fail to roll down, and improving the quality of the separation of the round granular seeds and the flat granular seeds.

[0018] Optionally, the conveying belt is also uniformly provided with a baffle structure.

[0019] By adopting the technical scheme, after the seeds fall on the conveying belt, the baffle structure can block the seeds on the conveying belt, reducing the probability that the flat granular seeds roll off the conveying belt in the direction of the conveying belt, helping the flat granular seeds and the round granular seeds to be better separated, and improving the quality of the separation of the round granular seeds and the flat granular seeds.

[0020] Optionally, the bottom of the feed inlet of the screening bin is also provided with a closing assembly, the closing assembly comprises a first valve plate and a second valve plate, the first valve plate and the second valve plate are both arranged between the feed inlet of the screening bin and the conveying belt, the first valve plate and the second valve plate are both rotationally connected to the screening bin, and the first valve plate and the second valve plate are connected by a flexible connecting piece.

[0021] By adopting the technical scheme, when the seeds fall from the feed inlet to the conveying belt, the seeds may accumulate on the conveying belt due to the rapid falling of the seeds. By adopting the technical scheme, the seeds fall between the first valve plate and the second valve plate from the feed inlet, and then fall from the first valve plate and the second valve plate to the conveying belt. The opening size of the closing assembly can be adjusted by adjusting the rotation angle of the first valve plate and the second valve plate. The probability of the seeds falling between the first valve plate and the second valve plate can be controlled by adjusting the opening size of the closing assembly, thereby controlling the speed of the seeds falling on the conveying belt. By slowing down the speed of the seeds falling on the conveying belt, the accumulation of the seeds on the conveying belt can be reduced, the quality of the separation of the round granular seeds and the flat granular seeds can be improved, and the speed of the seeds falling on the conveying belt can be increased to improve the separation efficiency of the seeds.

[0022] Optionally, the side edges of the conveying belt, the first screen and the second screen are all provided with vertical plates.

[0023] By adopting the technical scheme, when the seeds fall on the conveying belt, the first screen and the second screen, the vertical plate blocks on both sides of the conveying belt, the first screen and the second screen, thereby reducing the probability of the seeds falling from the edges of the conveying belt, the first screen and the second screen.

[0024] Optionally, the first screen and the second screen are further provided with a vibration generator, and a buffer is arranged between the first screen and the second aggregate bin and between the second screen and the first aggregate bin.

[0025] By adopting the technical scheme, the vibration generator can drive the first screen and the second screen to vibrate together, the first screen and the second screen can drive the seeds on the first screen and the second screen to move downward quickly when vibrating, thereby accelerating the rolling speed of the seeds on the first screen and the second screen, reducing the probability of the seeds being stuck in the screen holes of the screens, and improving the screening efficiency.

[0026] In summary, the utility model has at least one of the following beneficial technical effects:

[0027] By arranging the inclined conveying belt, the flat particles of the corn seeds can be conveyed upward on the conveying belt, and the round particles of the corn seeds can be rolled downward on the conveying belt, thereby separating the flat particles and the round particles in the corn seeds, facilitating the selection of the seeds with similar shapes for coating in the subsequent coating process of the corn seeds, and improving the uniformity of the seed coating.

[0028] After separating the flat particles and the round particles in the corn seeds, the first screen is used to screen the size of the round particles of the corn seeds, and the second screen is used to screen the size of the flat particles of the corn seeds, thereby screening the seeds with similar sizes together through secondary screening according to the size of the seeds, and further improving the uniformity of the seed coating.

[0029] The adjusting assembly is arranged on the screen, the size of the screen holes of the screen can be adjusted, thereby controlling the size of the screened seeds, the opening degree of the screen holes can be adjusted to be larger when the seed particles are generally larger, and the seeds are selected to be fuller, the opening degree of the screen holes can be adjusted to be smaller when the seed particles are generally smaller, and the seeds are selected to be relatively larger, thereby selecting the seeds according to the actual situation of the seeds, and increasing the practicability of the screening device.

[0030] The closing assembly and the baffle plate are respectively installed on the conveying belt, the speed of the seeds falling on the conveying belt can be adjusted, the seeds falling on the conveying belt are prevented from being stacked together, the seeds on the conveying belt are stirred by the stirring plate, the probability of blocking the rolling of the round particle seeds when the seeds are stacked together is reduced, the round particle seeds and the flat particle seeds can be better screened, and the precision of the seed screening is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a whole structure schematic view of an embodiment of the present application;

[0032] Figure 2 is a whole structure top view of an embodiment of the present application;

[0033] Figure 3 is a sectional view of A-A in the figure; Figure 2

[0034] Figure 4 is a schematic view of the internal structure of the screening bin in an embodiment of the present application;

[0035] Figure 5 is a partial enlarged schematic view of A part in the figure; Figure 4

[0036] Figure 6 is a schematic view of the mounting structure of the second screen in an embodiment of the present application;

[0037] Figure 7 is a schematic view of the adjusting assembly structure in an embodiment of the present application.

[0038] BRIEF DESCRIPTION OF DRAWINGS: 100, screening bin; 200, primary screening assembly; 210, conveying belt; 211, blocking strip structure; 212, vertical plate; 220, first driving member; 230, first material collecting bin; 240, second material collecting bin; 300, secondary screening assembly; 310, first screen; 320, second screen; 330, first material collecting groove; 340, second material collecting groove; 350, third material collecting groove; 360, fourth material collecting groove; 370, first flow limiting plate; 380, second flow limiting plate; 400, baffle plate; 410, stirring plate; 411, stirring sheet; 500, adjusting assembly; 510, sliding rail; 511, fastening hole; 520, adjusting plate; 530, fastener; 600, closing assembly; 610, first valve plate; 620, second valve plate; 630, flexible connecting member; 700, vibration generator; 710, buffer member. DETAILED DESCRIPTION

[0039] The present application will be further described in detail below. Figures 1 to 6 The present application will be further described in detail below.

[0040] ​​The utility model discloses a corn seed coating pre -screening device before. Refer to Figures 1 to 3 A corn seed coating pre -screening device mainly includes screening bin 100, install screening bin 100 inside screening assembly, wherein screening assembly includes primary screening assembly 200 and secondary screening assembly 300, wherein primary screening assembly 200 includes the conveyer belt 210 of installation in screening bin 100 inside and the first material bin 230 and the second material bin 240 of setting respectively in the both ends of conveyer belt 210, and conveyer belt 210 is inclined and is used to deliver the flat granule corn seed to the first material bin 230, and the round granule corn seed is delivered to the second material bin 240, wherein secondary screening assembly 300 includes the first screen 310 for screening round granule seed and the second screen 320 for screening flat granule seed, and the first screen 310 and the second screen 320 are used to screen the size of seed granule respectively.

[0041] When using, corn seed is poured into screening bin 100, and corn seed falls on the conveyer belt 210 of primary screening assembly 200 from the feed inlet of screening bin 100, and the conveyer belt 210 delivers the flat granule seed to the first material bin 230, and the round granule seed falls in the second material bin 240, and then the first screen 310 in secondary screening assembly 300 screens the round granule seed in the second material bin 240, and separates the large round granule seed and the small round granule seed, and the second screen 320 in secondary screening assembly 300 screens the flat granule seed in the first material bin 230, and separates the large flat granule seed and the small flat granule seed, and then the large round granule seed, the small round granule seed, the large flat granule seed and the small flat granule seed are obtained through the cooperation of primary screening assembly 200 and secondary screening assembly 300.

[0042] Refer to Figure 3 And Figure 4, the screening bin 100 is provided with a funnel-shaped feeding port at the top, corn seeds enter the inside of the screening bin 100 from the feeding port, the screening bin 100 is provided with a cabinet door at the side, and the cabinet door at the side can be opened to clean and maintain the inside of the screening bin 100; the closing assembly 600 is arranged below the feeding port, the closing assembly 600 comprises a first valve plate 610 and a second valve plate 620, the first valve plate 610 and the second valve plate 620 are arranged between the feeding port of the screening bin 100 and the conveying belt 210, the first valve plate 610 and the second valve plate 620 are provided with rotating shafts at the top, the rotating shafts are rotatably arranged on the inner wall of the screening bin 100, handles are further connected to the rotating shafts, the handles pass through the side wall of the screening bin 100 and are arranged outside the screening bin 100, the first valve plate 610 and the second valve plate 620 are rotatably connected to the screening bin 100 through the rotating shafts, in order to reduce the probability of seed falling from the side of the first valve plate 610 and the second valve plate 620, flexible connecting pieces 630 are connected between the first valve plate 610 and the second valve plate 620, the flexible connecting pieces 630 are arranged at the side of the first valve plate 610 and the second valve plate 620 respectively, the flexible connecting pieces 630 are made of flexible materials such as rubber, or the flexible connecting pieces 630 are made of a folding structure that can be stretched and contracted, the opening size of the closing assembly 600 can be controlled by adjusting the unfolding angle of the first valve plate 610 and the second valve plate 620, and then the speed of seed falling from the closing assembly 600 to the conveying belt 210 can be controlled.

[0043] Referring to Figures 3 to 4 , the preliminary screening assembly 200 comprises a conveying belt 210, a first driving member 220, a first material collecting bin 230 and a second material collecting bin 240, wherein the conveying belt 210 is rotatably arranged on two rotating shafts, the rotating shafts are fixedly arranged inside the screening bin 100 and used for supporting the conveying belt 210, the conveying belt 210 is arranged in an inclined manner, and the conveying belt 210 conveys towards the end with a high position, and the conveying belt 210 is arranged below the first valve plate 610 and the second valve plate 620; the first driving member 220 is fixedly mounted on the screening bin 100, in order to reduce the occupied space of the first driving member 200, the first driving member 220 is arranged inside the conveying belt 210, and the first driving member 220 drives the rotating shaft supporting the conveying belt 210 to rotate through a gear, so as to drive the conveying belt 210 to rotate; a supporting plate is arranged below the conveying belt 210, the supporting plate is fixedly mounted inside the screening bin 100, the first material collecting bin 230 and the second material collecting bin 240 are placed on the supporting plate, the first material collecting bin 230 is placed below the end with a high position of the conveying belt 210, and the second material collecting bin 240 is mounted below the end with a low position of the conveying belt 210.

[0044] In the embodiment, the conveying belt 210 is provided with a baffle structure 211, which is a raised pattern or a groove pattern pressed on the conveying belt 210, and the direction of the baffle structure 211 is perpendicular to the conveying direction of the conveying belt 210 and is uniformly distributed on the conveying belt 210. After the corn seeds enter the inside of the screening bin 100 from the closing assembly 600 and fall on the conveying belt 210, the conveying belt 210 is arranged in an inclined manner and conveys upward, so that the corn seeds with smooth particles fall on the conveying belt 210 and roll downward along the conveying belt 210 and fall into the second collecting bin 240, and the seeds with flat shapes roll upward along the conveying belt 210 and fall into the first collecting bin 230 after reaching the uppermost position, so as to realize the screening of the seeds with round particles and the seeds with flat particles. The baffle structure 211 can block the seeds on the conveying belt 210, reduce the probability of the seeds with flat particles rolling off the conveying belt 210 along the direction of the conveying belt 210, and help the seeds with flat particles and the seeds with round particles to be better separated.

[0045] With reference to Figures 4 to 5 , the conveying belt 210 is further provided with a baffle plate 400 fixedly arranged above the conveying belt 210, the baffle plate 400 is arranged at the side of the closing assembly 600 close to the position of the conveying belt 210, the baffle plate 400 is fixedly arranged on the inner wall of the screening bin 100 along the width direction of the conveying belt 210 and leaves a gap between the baffle plate 400 and the conveying belt 210, and after the seeds fall on the conveying belt 210, the seeds pass through the gap between the baffle plate 400 and the conveying belt 210 under the obstruction of the baffle plate 400, so as to flatten the seeds on the conveying belt 210 and reduce the probability of the seeds accumulating on the conveying belt 210.

[0046] With reference to Figure 5 , the baffle plate 400 is further provided with a push plate 410 fixedly arranged at the side of the baffle plate 400 close to the position of the conveying belt 210, the push plate 410 is provided with a plurality of push pieces 411 at the end close to the conveying belt 210, the plurality of push pieces 411 leave gaps between each other, and the plurality of push pieces 411 are arranged along the width direction of the conveying belt 210, and the push pieces 411 are used to push the seeds on the conveying belt 210 to move to both sides; when the seeds move on the conveying belt 210, the seeds contact the push plate 410, and the seeds on the conveying belt 210 are pushed to both sides by the push pieces 411, so as to make the round particle seeds blocked to move to both sides, and reduce the probability that the flat particle seeds are blocked on one side of the round particle seeds and cause the round particle seeds to be unable to roll downward.

[0047] In the embodiment, the side edge of the conveying belt 210 is further provided with a vertical plate 212, which is a structure protruding from the edge of the conveying belt 210, and can reduce the probability of the seeds falling from the edge of the conveying belt 210.

[0048] With reference to Figures 3 to 4The secondary screening assembly 300 comprises a first screen 310, a second screen 320, a first flow limiting plate 370 and a second flow limiting plate 380, wherein the first screen 310 and the second screen 320 are both arranged in an inclined manner, the first screen 310 is connected with the second aggregate bin 240 at a high position end thereof, the second screen 320 is connected with the first aggregate bin 230 at a high position end thereof, the first flow limiting plate 370 is fixedly arranged above the first screen 310, and a flow gap is formed between the first flow limiting plate 370 and the first screen 310, and the second flow limiting plate 380 is fixedly arranged above the second screen 320, and a flow gap is formed between the second flow limiting plate 380 and the second screen 320.

[0049] In the embodiment, the flat particle seeds in the first aggregate bin 230 will move downwards along the inclined direction of the second screen 320 in the flow gap between the second screen 320 and the second flow limiting plate 380, and the flat particle seeds with large particles and the flat particle seeds with small particles are separated by the second screen 320, and the round particle seeds in the second aggregate bin 240 will roll downwards along the inclined direction of the first screen 310 in the flow gap between the first screen 310 and the first flow limiting plate 370, and the round particle seeds with large particles and the round particle seeds with small particles are separated by the first screen 310. In order to reduce the probability of falling of the seeds from the edges of the first screen 310 and the second screen 320, the edges of the first screen 310 and the second screen 320 are provided with the vertical plates 212 in the embodiment, and the vertical plates 212 are protruding structures on the first screen 310 and the second screen 320.

[0050] Referring to Figure 4 The secondary screening assembly 300 further comprises a first aggregate chute 330, a second aggregate chute 340, a third aggregate chute 350 and a fourth aggregate chute 360, wherein the first aggregate chute 330 is fixedly arranged below the first screen 310 and is used for collecting the round particle seeds with small particles falling from the screen holes of the first screen 310, the second aggregate chute 340 is fixedly arranged below the low position end of the first screen 310 and is used for collecting the round particle seeds with large particles not falling from the screen holes of the first screen 310, the third aggregate chute 350 is fixedly arranged below the second screen 320 and is used for collecting the flat particle seeds with small particles falling from the screen holes of the second screen 320, and the fourth aggregate chute 360 is fixedly arranged below the low position end of the second screen 320 and is used for collecting the flat particle seeds with large particles not falling from the screen holes of the second screen 320.

[0051] In this embodiment, the round and smooth particle seeds falling on the second collecting bin 240 will roll down along the first screen 310. Since the first screen 310 has mesh holes, the smaller round particle seeds will fall through the mesh holes of the first screen 310 and be collected in the first collecting groove 330, and the larger round particle seeds will roll down on the first screen 310 and be collected in the second collecting groove 340 at the lower end of the first screen 310. The flat particle seeds falling on the first collecting bin 230 will roll down along the second screen 320. Similarly, the smaller flat particle seeds will fall through the mesh holes of the second screen 320 and be collected in the third collecting groove 350, and the larger flat particle seeds will roll down along the second screen 320 and be collected in the fourth collecting groove 360 at the lower end of the second screen 320.

[0052] With reference to Figure 4 and Figure 6 , the first screen 310 and the second screen 320 are also provided with a vibration generator 700. In this embodiment, the vibration generator 700 is a vibration motor. The vibration motor can drive the first screen 310 and the second screen 320 to vibrate, accelerate the rolling speed of the seeds on the first screen 310 and the second screen 320, and reduce the probability of the seeds being stuck in the mesh holes of the screens.

[0053] In order to reduce the vibration transmission from the first screen 310 and the second screen 320 to the first collecting bin 230 and the second collecting bin 240, a buffer 710 is arranged between the first screen 310 and the second collecting bin 240 and between the second screen 320 and the first collecting bin 230. In this embodiment, the buffer 710 is a shock absorber or a spring buffer. The top of the shock absorber is fixedly arranged at the bottom of the first collecting bin 230, the bottom of the shock absorber is fixedly arranged on the second screen 320, and the fixing mode between the second collecting bin 240 and the first screen 310 is the same as the above fixing mode.

[0054] With reference to Figure 7The bottom of the first screen 310 and the second screen 320 is further provided with an adjusting assembly 500, the adjusting assembly 500 comprising a sliding rail 510, an adjusting plate 520 and a fastener 530, wherein the edges of the bottom of the first screen 310 and the second screen 320 are provided with thickened portions, the sliding rail 510 is a groove opened in the length direction on the thickened portions of the bottom of the first screen 310 and the second screen 320; the adjusting plate 520 is slidingly arranged in the groove and closely arranged with the first screen 310 and the second screen 320, the adjusting plate 520 is provided with a leakage hole, when the coincidence degree of the leakage hole and the screen hole is high, the screen hole is opened larger, when the coincidence degree of the leakage hole and the screen hole is low, the screen hole is opened smaller; wherein the sliding rail 510 is provided with a fastening hole 511, the fastener 530 is installed in the fastening hole 511 and abuts on the adjusting plate 520, the fastener 530 is used for fixing the adjusting plate 520.

[0055] Before using the first screen 310 and the second screen 320, first pull the adjusting plate 520 to slide in the sliding rail 510, adjust the coincidence degree of the leakage hole on the adjusting plate 520 and the screen hole on the first screen 310 and the second screen 320, to adjust the size of the screen hole on the first screen 310 and the second screen 320, and then control the size of the seed screened by the first screen 310 and the second screen 320, after adjusting the size of the screen hole on the first screen 310 and / or the second screen 320, use the fastener 530 to abut the adjusting plate 520 in the sliding rail 510, and fix the adjusting plate 520, in the embodiment, the fastening hole 511 is a threaded hole, the fastener 530 is a butterfly nut matched with the threaded hole, by tightening the butterfly nut, the adjusting plate 520 in the sliding rail 510 can be fixed.

[0056] The implementation principle of the corn seed pre-screening device is as follows: the seeds enter the inside of the screening bin 100 from the feed inlet above the screening bin 100 and fall on the conveying belt 210, the conveying belt 210 is arranged in an inclined manner and conveys upwards, so that the corn seeds with smooth particles roll downwards along the conveying belt 210 and fall in the second collecting bin 240, and the seeds with flat shapes roll upwards along the conveying belt 210 and are collected in the first collecting bin 230; after the smooth particle seeds fall in the second collecting bin 240, the smooth particle seeds roll downwards along the first screen 310, the small circular particle seeds leak through the mesh holes of the first screen 310 and are collected in the first collecting groove 330, and the large circular particle seeds roll downwards on the first screen 310 and are collected in the second collecting groove 340 at the low end of the first screen 310; after the flat particle seeds fall in the first collecting bin 230, the small flat particle seeds roll downwards along the second screen 320 and leak through the mesh holes of the second screen 320 and are collected in the third collecting groove 350, and the large flat particle seeds roll downwards along the second screen 320 and are collected in the fourth collecting groove 360 at the low end of the second screen 320.

[0057] In conclusion, the inclined conveying belt 210 can distinguish the flat particles and the circular particles in the corn seeds, and then the first screen 310 is used to screen the size of the circular particle corn seeds, and the second screen 320 is used to screen the size of the flat particle corn seeds, so that the seeds with similar sizes and shapes are screened together through secondary screening, the seeds with similar shapes are selected for coating in the subsequent corn seed coating process, the uniformity of seed coating is improved, the size of the screened seeds can be controlled by adjusting the size of the mesh holes of the screen through the adjusting assembly 500, the seeds can be selected according to the actual situation of the seeds, the practicability of the screening device is improved, the speed of the seeds falling on the conveying belt 210 can be adjusted through the closing assembly 600 and the baffle 400, the seeds are prevented from piling together when falling on the conveying belt 210, the seeds on the conveying belt 210 are moved through the push plate 410, the probability of blocking the rolling of the circular particle seeds is reduced when the seeds stick together, the circular particle seeds and the flat particle seeds can be better screened, and the accuracy of seed screening is improved.

[0058] The above are preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A corn seed pre-screening device before coating, comprising a screening bin (100), wherein a screening assembly is arranged inside the screening bin (100), and characterized in that, the screening assembly comprises a primary screening assembly (200) and a secondary screening assembly (300); the primary screening assembly (200) comprises: a conveying belt (210) fixedly arranged inside the screening bin (100), wherein the conveying belt (210) is arranged in an inclined manner, the conveying belt (210) is arranged below the feeding port of the screening bin (100), and the conveying belt (210) is arranged to convey seeds to the high position end; a first driving member (220) fixedly arranged on the screening bin (100), wherein the first driving member (220) is used to drive the conveying belt (210) to rotate; a first material collecting bin (230) fixedly arranged inside the screening bin (100), wherein the first material collecting bin (230) is arranged below the high position end of the conveying belt (210); a second material collecting bin (240) fixedly arranged inside the screening bin (100), wherein the second material collecting bin (240) is arranged below the low position end of the conveying belt (210); the secondary screening assembly (300) comprises: a first screen (310) arranged in an inclined manner, wherein the high position end of the first screen (310) is in communication with the second material collecting bin (240); a second screen (320) arranged in an inclined manner, wherein the high position end of the second screen (320) is in communication with the first material collecting bin (230); a first material collecting groove (330) fixedly arranged below the first screen (310) and used to collect first seeds; a second material collecting groove (340) fixedly arranged below the low position end of the first screen (310) and used to collect second seeds; a third material collecting groove (350) fixedly arranged below the second screen (320) and used to collect third seeds; a fourth material collecting groove (360) fixedly arranged below the low position end of the second screen (320) and used to collect fourth seeds.

2. A pre-screening device for coating corn seeds according to claim 1, characterized in that: the first screen (310) and the second screen (320) are further provided with an adjusting assembly (500) at the bottom thereof, wherein the adjusting assembly (500) comprises: a slide rail (510) fixedly arranged at the bottom of the first screen (310) and the second screen (320); an adjusting plate (520) slidably arranged on the slide rail (510), wherein the adjusting plate (520) is arranged close to the first screen (310) and the second screen (320), and a plurality of holes are formed in the adjusting plate (520); a fastener (530) arranged in a fastener hole (511) of the slide rail (510) and abutting against the adjusting plate (520), wherein the fastener (530) is used to fix the adjusting plate (520).

3. A pre-screening device for coating corn seeds according to claim 2, characterized in that: the secondary screening assembly (300) further comprises: A first flow-limiting plate (370) is fixedly arranged above the first screen (310), and a flow gap is formed between the first flow-limiting plate (370) and the first screen (310); A second flow-limiting plate (380) is fixedly arranged above the second screen (320), and a flow gap is formed between the second flow-limiting plate (380) and the second screen (320).

4. A pre-screening device for coating corn seeds according to any one of claims 1-3, characterized in that: A baffle (400) is further fixedly arranged above the conveying belt (210), and is arranged on the side of the high position of the feeding port of the screening bin (100) close to the conveying belt (210). The baffle (400) is arranged along the width direction of the conveying belt (210), and a gap is left between the baffle (400) and the conveying belt (210).

5. A pre-screening device for coating corn seeds according to claim 4, characterized in that: A push plate (410) is further fixedly arranged on the baffle (400), and is arranged on the side of the high position of the baffle (400) close to the conveying belt (210). The push plate (410) is provided with a plurality of push pieces (411) on the end close to the conveying belt (210). The plurality of push pieces (411) are arranged along the width direction of the conveying belt (210), and the push pieces (411) are used to push the seeds on the conveying belt (210) to move to both sides.

6. A pre-screening device for coating corn seeds according to claim 5, characterized in that: A plurality of blocking strip structures (211) are further uniformly arranged on the conveying belt (210).

7. A pre-screening device for coating corn seeds according to any one of claims 1-3, characterized in that: A closing assembly (600) is further arranged at the bottom of the feeding port of the screening bin (100). The closing assembly (600) comprises a first valve plate (610) and a second valve plate (620). The first valve plate (610) and the second valve plate (620) are arranged between the feeding port of the screening bin (100) and the conveying belt (210). The first valve plate (610) and the second valve plate (620) are both rotationally connected to the screening bin (100), and the first valve plate (610) and the second valve plate (620) are connected by a flexible connecting piece (630).

8. A pre-screening device for coating corn seeds according to any one of claims 1-3, characterized in that: The conveying belt (210), the first screen (310) and the second screen (320) are all provided with vertical plates (212) on the side edges.

9. A pre-screening device for coating corn seeds according to any one of claims 1-3, characterized in that: The first screen (310) and the second screen (320) are further provided with vibration generators (700). The first screen (310) and the second screen (320) are both provided with buffer members (710).

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