Test bed for variable-particle-size air-aspiration type precision seed-metering device

Abstract

The utility model discloses a test bed for a variable-particle-size air-aspiration type precision seed-metering device, which relates to the technical field of precision seeding of seed-metering devices and comprises a lower rack, an upper rack, a conveying belt, a driving part I, a chain transmission mechanism I, a feed hopper, a seed guide pipe, a seed disturbing mechanism, a seed-metering mechanism and a dustproof detection mechanism, the seed metering mechanism comprises an air suction chamber, a fan, an air pipe, a major arc conveying assembly and an aperture adjusting assembly. According to the utility model, the seed suction holes in the seed-metering disc can be shielded by the hole baffle, so that the diameters of the seed suction holes can be changed according to different diameters of seeds, the seed-metering disc does not need to be disassembled and replaced, the seed-metering efficiency is improved, and the time is saved; a photoelectric sensor is arranged to detect the miss-seeding and reseeding conditions of the seeds; through the arrangement of a transparent dustproof plate and dust removal cloth, dust generated in the seeding process can be cleaned mechanically, and the detection precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of precision seed metering technology, specifically a test bench for a variable particle size air-suction precision seed metering device. Background Technology

[0002] Soybeans and corn are important food crops in my country, and good sowing machinery can significantly increase yields. Seed metering devices, as key components of sowing machinery, directly affect the quantity and quality of seeds sown. Air-suction seed metering devices are widely used due to their advantages such as not damaging seeds, relatively flexible seed shape requirements, and high operating speed, and have become a major research direction for precision seeders.

[0003] Utility model patent with authorization announcement number CN202374677U discloses an air-suction seed metering device for a seeder. The seed metering device cover and the seed picking tray cooperate to form an air chamber installed on the seed metering device housing. The seed picking tray has multiple adsorption holes around its circumference. A seed agitator is set on the seed picking tray, which is set inside the seed metering device housing. A transmission assembly is set on one side of the seed metering device housing to drive the seed picking tray to rotate. A seed protection plate is set at the lower part of the seed metering device cover. An air source is connected to the air duct interface of the seed metering device cover through a negative pressure air duct and communicates with the air chamber. A seed quantity limiting plate is set in the seed chamber. An inner seed brush is set inside the seed metering device housing. An outer seed brush plate in the outer seed brush assembly is set inside the seed metering device housing. An adjustment device for the outer seed brush plate is set outside the housing.

[0004] While the existing technology achieves low pressure loss and high seed metering accuracy by synchronously rotating the seed metering disc and negative pressure chamber during operation, it requires changing the seed metering disc when sowing seeds of different sizes, such as soybeans and corn. Furthermore, it is susceptible to dust during sowing, and the monitoring system cannot accurately identify missed or repeated sowing, affecting the accuracy and precision of the sowing. Therefore, there is an urgent need for a test bench for a variable-particle-size air-suction precision seed metering device to solve these problems. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a test bench for a variable particle size air-suction precision seed metering device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A test stand for a variable particle size air-suction precision seed metering device includes a lower frame and an upper frame, wherein the bottom of the upper frame is connected to the top of the lower frame, and further includes:

[0008] A conveyor belt is rotatably connected to the lower frame, and the conveyor belt is horizontally positioned.

[0009] Drive component one connects to the lower frame;

[0010] The chain transmission mechanism is connected with the output end of the driving member at one end and connected with the conveying belt at the other end.

[0011] The feeding hopper is connected with the upper frame, and a discharging partition plate is arranged in the feeding hopper, so that the internal space of the feeding hopper is divided into a seed storage space and a seed discharging space.

[0012] The seed guide pipe is connected with the bottom of the feeding hopper, and is located on the top of the conveying belt and at the bottom of the seed discharging space.

[0013] The seed disturbing mechanism is connected with the upper frame at one end and connected with the feeding hopper at the other end, and is used for disturbing the seeds in the feeding hopper.

[0014] The seed sowing mechanism is connected with the feeding hopper, and comprises: a suction chamber connected with the feeding hopper, wherein the suction chamber is arc-shaped; a fan connected with the lower frame; an air pipe connected with the inside of the fan at one end and connected with the inside of the suction chamber at the other end; an arc-shaped conveying assembly connected with the feeding hopper at one end and connected with the suction chamber at the other end, wherein the arc-shaped conveying assembly is connected with the output end of the power member, and is used for sucking and conveying the seeds and sowing the seeds; and a hole diameter adjusting assembly connected with the arc-shaped conveying assembly, and used for adjusting the hole diameter of the arc-shaped conveying assembly according to different sizes of the seeds.

[0015] The dustproof detection mechanism is connected with the upper frame at one end and connected with the seed guide pipe at the other end, and is used for detecting the seed missing and re-sowing.

[0016] As a further scheme of the utility model, the seed disturbing mechanism comprises:

[0017] The driving member two is connected with the upper frame.

[0018] The chain transmission mechanism two is connected with the output end of the driving member two at one end.

[0019] The stirring rod penetrates through one side of the feeding hopper and is rotationally connected with the feeding hopper, and one end of the stirring rod is connected with the other end of the chain transmission mechanism two.

[0020] As a further scheme of the utility model, the arc-shaped conveying assembly comprises:

[0021] The air chamber shell cover disc is connected with the central part of the suction chamber.

[0022] The suction chamber pressing disc is connected with the inner wall of the suction chamber at one side, the suction chamber pressing disc is arc-shaped, and the other side of the suction chamber pressing disc is abutted with one side of the hole diameter adjusting assembly.

[0023] The seed plate is connected with one side of the aperture adjusting assembly, and the other side of the seed plate is connected with the air suction pad.

[0024] The air suction pad is arranged on the other side of the seed plate, and the air suction pad is provided with an arc-shaped through groove.

[0025] The air suction pad pressing disc is connected with the seed plate through a bolt, and the air suction pad pressing disc is connected with the output end of the power piece.

[0026] As a further scheme of the utility model, the aperture adjusting assembly comprises:

[0027] The positioning plate is arranged between the seed plate and the air suction chamber pressing disc.

[0028] The hole blocking plate is arranged between the seed plate and the air suction chamber pressing disc.

[0029] As a further scheme of the utility model, the dustproof detection mechanism comprises:

[0030] The through hole is arranged on the seed guide pipe.

[0031] The telescopic piece is connected with the upper rack at the top end.

[0032] The connecting plate is connected with the bottom end of the telescopic piece.

[0033] The connecting rod is connected with the connecting plate at one end.

[0034] The transparent dustproof plate is connected with the other end of the connecting rod and is in sliding abutment with the seed guide pipe.

[0035] The photoelectric sensor is connected with the transparent dustproof plate.

[0036] The dust cloth is connected with the seed guide pipe and is arranged at the bottom of the transparent dustproof plate.

[0037] As a further scheme of the utility model, the utility model further comprises:

[0038] The seed scraper is arranged in the seed storage space and is connected with the feeding hopper.

[0039] Compared with the prior art, the utility model has the beneficial effects that:

[0040] 1、 The utility model discloses a baffle plate can be shaded to the suction hole on the seed sowing disc, thereby can change the diameter of suction hole according to the different diameter of seed, need not to dismantle and replace the seed sowing disc, improve the seed sowing efficiency, save time.

[0041] The utility model discloses a photoelectric sensor can detect the seed missing and rebroadcasting.

[0042] 3、 The utility model discloses a transparent dustproof board and dust cloth can clean the dust mechanical energy generated in the sowing process, improve detection accuracy. DRAWINGS

[0043] Figure 1 It is the structure schematic drawing of test bench of the air-suction type precision seed sowing device of variable grain size in the utility model embodiment.

[0044] Figure 2 It is the structure schematic drawing of seed disturbing mechanism in the utility model embodiment.

[0045] Figure 3 It is the structure schematic drawing of seed sowing mechanism in the utility model embodiment.

[0046] Figure 4 It is the structure split schematic drawing of seed sowing mechanism in the utility model embodiment.

[0047] Figure 5 It is the structure schematic drawing of positioning plate in the utility model embodiment.

[0048] Figure 6 It is the structure schematic drawing of feed hopper in the utility model embodiment.

[0049] Figure 7 It is the structure schematic drawing of dustproof detection mechanism in the utility model embodiment.

[0050] Figure 8 It is the structure schematic drawing of aperture adjusting assembly in the utility model embodiment.

[0051] Figure 9 It is the structure schematic drawing of air-suction pad in the utility model embodiment.

[0052] In the figure: 1, lower rack; 2, conveying belt; 3, driving part one; 4, chain transmission mechanism one; 5, upper rack; 6, feeding hopper; 7, driving part two; 8, chain transmission mechanism two; 9, stirring rod; 10, air suction chamber; 11, fan; 12, air pipe; 13, seed guiding pipe; 14, air chamber shell cover disc; 15, air suction chamber pressure disc; 16, blocking plate; 17, seed plate; 18, positioning plate; 19, air suction pad pressure disc; 20, air suction pad; 21, seed scraper; 22, telescopic part; 23, connecting plate; 24, connecting rod; 25, transparent dustproof plate; 26, photoelectric sensor; 27, dust removal cloth; 28, through hole; 29, discharging partition plate. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0054] In the embodiments of the utility model, please refer to Figures 1 to 9 A test bench of the air suction type precision seed metering device with variable particle size, comprising a lower rack 1 and an upper rack 5, the bottom of the upper rack 5 is connected with the top of the lower rack 1, and further comprising:

[0055] The conveying belt 2 is rotationally connected with the lower rack 1, and the conveying belt 2 is horizontally arranged;

[0056] The driving part one 3 is connected with the lower rack 1;

[0057] The chain transmission mechanism one 4 is connected with the output end of the driving part one 3 at one end and connected with the conveying belt 2 at the other end;

[0058] The feeding hopper 6 is connected with the upper rack 5, and the feeding hopper 6 is internally provided with a discharging partition plate 29, so that the internal space of the feeding hopper 6 is divided into a seed storage space and a seed discharge space,

[0059] The seed guiding pipe 13 is connected with the bottom of the feeding hopper 6, the seed guiding pipe 13 is located at the top of the conveying belt 2 and at the bottom of the seed discharge space;

[0060] The seed disturbing mechanism is connected with the upper rack 5 at one end and connected with the feeding hopper 6 at the other end, and is used for disturbing the seeds in the feeding hopper 6;

[0061] The seed sowing mechanism is connected with the feeding hopper 6, and comprises: a suction chamber 10 connected with the feeding hopper 6, wherein the suction chamber 10 is arc-shaped; a fan 11 connected with the lower frame 1; a wind pipe 12, one end of which is in communication with the inside of the fan 11, and the other end of which is in communication with the inside of the suction chamber 10; an arc-shaped conveying assembly, one end of which is connected with the feeding hopper 6, and the other end of which is connected with the suction chamber 10, wherein the arc-shaped conveying assembly is connected with the output end of the power element, and is used for sucking and conveying the seeds and sowing the seeds; and a hole diameter adjusting assembly connected with the arc-shaped conveying assembly, and used for adjusting the hole diameter of the arc-shaped conveying assembly according to the different sizes of the seeds.

[0062] The dustproof detection mechanism is connected with the upper frame 5 at one end, and connected with the seed guide pipe 13 at the other end, and is used for detecting the seed missing and re-sowing.

[0063] The seeds are poured into the inside of the feeding hopper 6, and the seeds are located in the seed storage space; according to the size of the seeds, the hole diameter of the arc-shaped conveying assembly is adjusted through the hole diameter adjusting assembly; the fan 11 works to generate suction force, so that the suction chamber 10 generates suction force; the seed disturbing mechanism disturbs the seeds in the feeding hopper 6, so that the seeds can be adsorbed on the arc-shaped conveying assembly; the arc-shaped conveying assembly conveys the seeds; when the seeds enter the seed discharging space, the seeds fall into the seed guide pipe 13; the dustproof detection mechanism detects the seed missing and re-sowing; the seeds fall on the conveying belt 2; the driving element one 3 drives the chain transmission mechanism one 4 to rotate; the chain transmission mechanism one 4 drives the conveying belt 2 to rotate, so as to convey the seeds.

[0064] As an embodiment of the utility model, referring to Figures 1 to 4 、 Figure 6 , the seed disturbing mechanism comprises:

[0065] The driving element two 7 is connected with the upper frame 5;

[0066] The chain transmission mechanism two 8 is connected with the output end of the driving element two 7 at one end;

[0067] The stirring rod 9 penetrates through one side of the feeding hopper 6 and is rotationally connected therewith, and one end of the stirring rod 9 is connected with the other end of the chain transmission mechanism two 8.

[0068] The seeds are poured into the inside of the feeding hopper 6, and the seeds are located in the seed storage space; the driving element two 7 drives the chain transmission mechanism two 8 to rotate; the chain transmission mechanism two 8 drives the stirring rod 9 to rotate; the stirring rod 9 stirs the seeds, so that the seeds can be adsorbed on the seed sowing disc 17.

[0069] As an embodiment of the utility model, referring to Figures 1 to 6 、 Figure 8 and Figure 9The optimal-arc conveying assembly comprises:

[0070] The air chamber shell cover disc 14 is connected with the central part of the air suction chamber 10.

[0071] The air suction chamber pressure disc 15 is connected with the inner wall of the air suction chamber 10 on one side, the air suction chamber pressure disc 15 is in the shape of an optimal arc, and the other side of the air suction chamber pressure disc 15 is in abutment with one side of the aperture adjusting assembly.

[0072] The seed plate 17 is connected with the other side of the aperture adjusting assembly, the seed plate 17 is provided with two groups of seed suction holes with different diameters, the seed suction holes are arranged in a circle, the diameters of the circles formed by the two groups of seed suction holes are different, and the two groups of seed suction holes with different diameters are arranged at intervals.

[0073] The air suction pad 20 is in abutment with the other side of the seed plate 17, the air suction pad 20 is provided with an optimal-arc-shaped through groove, the through groove is in communication with the inside of the seed suction hole, a part of the through groove is in communication with the seed storage space, and the other part is in communication with the seed discharge space, the bottom of the through groove in communication with the seed discharge space is in the shape of an inclined edge, and the central part of the air suction pad 20 is provided with a circular hole.

[0074] The air suction pad pressure disc 19 is rotationally connected with the inner wall of the circular hole in the air suction pad 20, the air suction pad pressure disc 19 is connected with the seed plate 17 through bolts, the air suction pad pressure disc 19 is connected with the output end of a power element (not shown in the figure), and the power element is connected with the feeding hopper 6.

[0075] The aperture adjusting assembly comprises:

[0076] The positioning plate 18 is located between the seed plate 17 and the air suction chamber pressure disc 15, the positioning plate 18 is connected with the seed plate 17 and is in abutment with the air suction chamber pressure disc 15, and the positioning plate 18 is provided with a plurality of groups of tooth partition plates arranged in a circle.

[0077] The hole blocking plate 16 is located between the seed plate 17 and the air suction chamber pressure disc 15, the hole blocking plate 16 is connected with the air suction pad pressure disc 19 through bolts, and the hole blocking plate 16 is provided with a plurality of groups of tooth blocking plates arranged in a circle and used for shielding the seed suction holes.

[0078] According to the different sizes of the seeds, the hole blocking plate 16 is rotated to shield a group of seed suction holes, the air suction pad 20 is provided with an optimal-arc-shaped through groove, the seeds in the seed storage space are adsorbed on the seed plate 17 through the seed suction holes due to the suction force generated by the fan 11, the power element (not shown in the figure) drives the seed plate 17 to rotate, and then drives the seeds to revolve in the through groove, when the seeds rotate into the seed discharge space, the seeds continue to rotate to be in abutment with the inclined edge at the bottom of the through groove, so that the seeds are separated from the seed plate 17, and the seeds fall into the seed guide pipe 13.

[0079] As an embodiment of the utility model, please refer to Figures 1 to 4 、 Figure 7 , the dustproof detection mechanism comprises:

[0080] The through hole 28 is arranged on the seed guiding pipe 13.

[0081] The telescopic piece 22 is connected with the upper rack 5 at the top end.

[0082] The connecting plate 23 is connected with the bottom end of the telescopic piece 22.

[0083] The connecting rod 24 is connected with the connecting plate 23 at one end.

[0084] The transparent dustproof plate 25 is connected with the other end of the connecting rod 24, and is in sliding abutment with the seed guiding pipe 13, wherein the transparent dustproof plate 25 shields the through hole 28.

[0085] The photoelectric sensor 26 is connected with the transparent dustproof plate 25.

[0086] The dust removal cloth 27 is connected with the seed guiding pipe 13 and is located at the bottom of the transparent dustproof plate 25.

[0087] When the seeds fall in the seed guiding pipe 13, pass through the through hole 28, and the photoelectric sensor 26 detects the seeds, the seed missing and the seed overwriting can be detected, when the dust is adsorbed on the transparent dustproof plate 25, and reaches a certain threshold value, the telescopic piece 22 works to drive the connecting plate 23 to move downward, the connecting plate 23 drives the connecting rod 24 to move downward, and then drives the transparent dustproof plate 25 to move downward, so that the transparent dustproof plate 25 rubs with the dust removal cloth 27, the dust adhered on the transparent dustproof plate 25 is removed, and the detection precision is improved. The telescopic piece 22 can adopt an electric telescopic rod, an air cylinder and the like.

[0088] As an embodiment of the utility model, please refer to Figure 4 and Figure 6 , further comprising:

[0089] The seed scraper 21 is located in the seed storage space and is connected with the feeding hopper 6.

[0090] The excess seeds on the seed sowing disc 17 are scraped off by the seed scraper 21 arranged, so that only single seeds fall into the seed guiding pipe 13, and the seed sowing is completed.

[0091] The working principle of the utility model is: the seed is poured into the inside of the feed hopper 6, the seed is located in the seed storage space, according to the different size of the seed, the baffle plate 16 is rotated, so that the baffle plate 16 shields a group of seed suction holes, the fan 11 works to produce suction, because the air suction pad 20 is provided with an arc-shaped through groove, the seed located in the seed storage space is adsorbed on the seed plate 17 through the seed suction hole, the power element (not shown in the drawing) drives the seed plate 17 to rotate, and then drives the seed to revolve in the through groove, when the seed rotates to the seed outlet space, continues to rotate, so that the seed abuts against the inclined edge at the bottom of the through groove, so that the seed is separated from the seed plate 17, and the seed falls downward into the seed guide pipe 13; the driving element two 7 works to drive the chain transmission mechanism two 8 to rotate, the chain transmission mechanism two 8 drives the stirring rod 9 to rotate, the stirring rod 9 stirs the seed, so that the seed can be adsorbed on the seed plate 17; when the seed falls in the seed guide pipe 13, passes through the through hole 28, the photoelectric sensor 26 detects the seed, can detect the seed missing and overplanting, when the dust is adsorbed on the transparent dustproof plate 25, reaches a certain threshold value, the telescopic element 22 works to drive the connecting plate 23 to move downward, the connecting plate 23 drives the connecting rod 24 to move downward, and then drives the transparent dustproof plate 25 to move downward, so that the transparent dustproof plate 25 is rubbed with the dust removal cloth 27, removes the dust adhered on the transparent dustproof plate 25, improves the detection precision; the seed falls on the conveyor belt 2, the driving element one 3 drives the chain transmission mechanism one 4 to rotate, the chain transmission mechanism one 4 drives the conveyor belt 2 to rotate, and the seed is conveyed.

[0092] It is apparent for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0093] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A test bench for a variable-size air-suction precision seed metering device, comprising a lower frame and an upper frame, the bottom of the upper frame being connected to the top of the lower frame, characterized in that, Also include: The conveying belt is rotatably connected with the lower frame, and the conveying belt is horizontally arranged; The driving member one is connected with the lower frame; The chain transmission mechanism one is connected with the output end of the driving member one at one end and connected with the conveying belt at the other end; The feeding hopper is connected with the upper frame, and the feeding hopper is internally provided with a discharging partition plate, so that the internal space of the feeding hopper is divided into a seed storage space and a seed discharging space, The seed guide pipe is connected with the bottom of the feeding hopper, the seed guide pipe is located on the top of the conveying belt and on the bottom of the seed discharging space; The seed disturbing mechanism is connected with the upper frame at one end and connected with the feeding hopper at the other end, and is used for disturbing the seeds in the feeding hopper; The seed discharging mechanism is connected with the feeding hopper, and the seed discharging mechanism comprises: a gas suction chamber connected with the feeding hopper, the gas suction chamber is arcuate; a fan connected with the lower frame; an air pipe in communication with the inside of the fan at one end and in communication with the inside of the gas suction chamber at the other end; an arcuate conveying assembly connected with the feeding hopper at one end and connected with the gas suction chamber at the other end, the arcuate conveying assembly is connected with the output end of the power member, and is used for sucking and conveying the seeds and discharging the seeds; a hole diameter adjusting assembly connected with the arcuate conveying assembly, and used for adjusting the hole diameter of the arcuate conveying assembly according to different sizes of the seeds; The dustproof detection mechanism is connected with the upper frame at one end and connected with the seed guide pipe at the other end, and is used for detecting the seed missing and reseeding.

2. The test bench of the air suction type precision seed metering device with variable grain size according to claim 1, characterized in that, The seed disturbing mechanism comprises: The driving member two is connected with the upper frame; The chain transmission mechanism two is connected with the output end of the driving member two at one end; The stirring rod penetrates through one side of the feeding hopper and is rotatably connected with the feeding hopper, and the stirring rod is connected with the chain transmission mechanism two at one end and connected with the chain transmission mechanism two at the other end.

3. The test bench of the air suction type precision seed metering device with variable grain size according to claim 1, characterized in that, The arcuate conveying assembly comprises: The air chamber cover disc is connected with the center part of the gas suction chamber; The gas suction chamber pressure disc is connected with the inner wall of the gas suction chamber at one side, the gas suction chamber pressure disc is arcuate, and the other side of the gas suction chamber pressure disc is abutted with one side of the hole diameter adjusting assembly; The seed discharging disc is connected with the other side of the hole diameter adjusting assembly at one side, a plurality of seed suction holes with different diameters are formed in the seed discharging disc, the seed suction holes are circumferentially arranged, the diameters of two groups of seed suction holes are different, and the seed suction holes with different diameters are arranged at intervals; The air suction pad is abutted with the other side of the seed discharging disc, the air suction pad is provided with an arcuate through groove, the through groove is in communication with the inside of the seed suction hole, a part of the through groove is in communication with the seed storage space, and the other part is in communication with the seed discharging space, the bottom of the through groove in communication with the seed discharging space is in a bevel structure, and a circular hole is formed in the center part of the air suction pad; The air suction pad pressure disc is rotatably connected with the inner wall of the circular hole in the air suction pad, the air suction pad pressure disc is connected with the seed discharging disc through bolts, the air suction pad pressure disc is connected with the output end of the power member, and the power member is connected with the feeding hopper.

4. The test bench of the air suction type precision seed metering device with variable grain size according to claim 3, characterized in that, The hole diameter adjusting assembly comprises: The positioning plate is located between the seed discharging disc and the gas suction chamber pressure disc, the positioning plate is connected with the seed discharging disc and abutted with the gas suction chamber pressure disc, and a plurality of groups of tooth partition plates circumferentially arranged are formed in the positioning plate; The hole blocking plate is located between the seed discharging disc and the gas suction chamber pressure disc, the hole blocking plate is connected with the air suction pad pressure disc through bolts, a plurality of groups of tooth blocking plates circumferentially arranged are formed in the hole blocking plate, and the tooth blocking plates are used for blocking the seed suction holes.

5. The test bench of the air suction type precision seed metering device with variable grain size according to claim 1, characterized in that, The dustproof detection mechanism comprises: The through hole is formed in the seed guide pipe; The telescopic member is connected with the upper frame at the top end. The connecting plate is connected with the bottom end of the telescopic part. The connecting rod is connected with one end of the connecting plate. The transparent dustproof plate is connected with the other end of the connecting rod and is in sliding abutment with the seed guiding tube. The photoelectric sensor is connected with the transparent dustproof plate. The dust cloth is connected with the seed guiding tube and is located at the bottom of the transparent dustproof plate.

6. The test bench of the air suction type precision seed metering device with variable grain size according to claim 1, characterized in that, Further comprising: The seed scraper is located in the seed storage space and is connected with the feeding hopper.

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