CN108770429A - A kind of pneumatic transmission formula high speed seed of maize - Google Patents

Abstract

The invention relates to a pneumatic high-speed corn seed metering device, which comprises a rear casing, a seeding tray, a plug-in hole, a shaft, a stirring wheel and a front casing; the front casing includes a seed feeding pipe and a partition plate , seed protection plate, seed drop port and central cylinder. The present invention uses air delivery to fill the seeds, which solves the problem of poor seed filling performance due to the accumulation of the original populations inside the seed meter; the method of stirring seeds with airflow and seed stirring wheels further reduces the possibility of population accumulation, providing Improving the speed of the seed meter provides a prerequisite; the use of replaceable hole inserts is suitable for corn seeds of different varieties and shapes, ensuring the applicability of the seed meter; a seed protection plate with variable width and angle is designed to achieve seed protection and the function of clearing seeds; the invention has a compact structure, can realize the function of high-speed precision sowing, greatly reduces the production labor force, improves the efficiency, and ensures the quality of corn.

Description

A pneumatic high-speed corn seed metering device

technical field

The invention relates to a pneumatic high-speed corn seed metering device, which belongs to the technical field of agricultural machinery.

Background technique

Maize mechanized precision sowing can save artificial thinning, save seeds, increase production and save costs, so it has become the development trend of corn sowing in recent years. The seed metering device with stable performance and high-speed operation has become the key to realize the mechanized precision sowing of corn.

At present, most of the high-speed seeding devices are pneumatic seed metering devices. The main reason is that they do not have high requirements on the shape of the seeds, have a small damage rate, and have a simple structure. However, the adaptability to non-round seeds such as corn is poor, mainly due to the high requirements on negative pressure stability, seed layer height and seeding disc rotation speed during the filling process, so the poor filling performance leads to its practical During the operation, the rate of missed seeding is high, especially when the rotation speed of the head fan is insufficient and the air pressure is insufficient. The seeds are quantitatively sent to the seed meter by air flow, and at the same time, the air flow and the seed stirring plate disturb the population, which can effectively solve the problem of poor seed filling performance and ensure the operation quality.

Contents of the invention

The purpose of the present invention is to provide a kind of pneumatic high-speed corn seed metering device, which has good adaptability to the shape of corn seeds, adopts the mode of air feeding and airflow and agitation to disturb the population to solve the problem of poor filling performance of the current seed metering device, While improving the operation speed, the operation quality is guaranteed.

In order to achieve the above object, the present invention provides the following technical solutions:

The invention provides a pneumatic high-speed corn seed metering device, comprising a rear housing 1, a seeding disc 2, a shaft 4, and a front housing 6; the rear housing 1 and the front housing 6 are fixedly connected to each other to form a The seed metering device housing; the rear housing 1 is disc-shaped, and the inner surface of the rear housing 1 has an accommodation space for accommodating the seed metering disc 2, and the center of the rear housing 1 is provided with a bearing mounting hole 8; the said The seed disc 2 is circular and has a certain thickness. The center of the seed disc 2 is provided with a shaft hole corresponding to the bearing mounting hole 8 of the rear casing 1; one end of the shaft 4 is provided with a fixed plate 13, and the other One end is provided with the sprocket fixed hole 14 that is used to be connected with driving sprocket; The described shaft 4 is affixed to the center of circle of seeding disk 2 through fixing plate 13, and the other end passes through the axle hole of seeding disk 2 successively and is installed with The bearing mounting hole 8 of the rear housing 1 of the bearing protrudes outward; the seed meter further includes a hole insert 3 and a seed stirring wheel 5 .

The front housing 6 includes a seed inlet tube 16 , a partition plate 17 , a seed guard plate 18 , a seed drop port 19 and a central cylinder 25 .

The central cylinder 25 is arranged at the center of the front casing 6 and forms an annular cavity together with the inner side wall of the front casing 6 .

Described seed protection plate 18 is a three-quarters arc-shaped plate body that is fixed on the inner side wall rear edge of the front housing 6 and has a length of three quarters of the inner side wall rear edge circumference of the front housing 6. The head end of the seed plate 18 is positioned on the horizontal axis of the front casing 6, and the end is positioned on the vertical axis of the front casing 6, which surrounds the upper part and one side lower part of the inner side wall rear edge of the front casing 6 without being surrounded. The inner side wall of the lower part of the front housing 6 corresponding to the part of the corresponding part is provided with a seed drop opening 19 .

The seed protection plate 18 has a first arc segment 26 and a second arc segment 27 from the head end to the end, wherein the length of the second arc segment 27 is the circumference of the rear edge of the inner side wall of the front housing 6 A quarter of that; the front edges of the first arc segment 26 and the second arc segment 27 have an inclined portion bent towards the center of the circle.

When the seed drop opening 19 is arranged on the inner side wall of the rear side of the lower left part of the front housing 6, the seed injection pipe 16 passes horizontally from the side wall of the lower left part of the front housing 6 into the center of the An annular cavity formed by the cylinder 25 and the inner side wall of the front housing 6; 16 horizontally enters the annular cavity formed by the central cylinder 25 and the inner side wall of the front housing 6 from the side wall at the front side of the lower right part of the front housing 6 .

A partition plate 17 is arranged between the seed drop port 19 and the seed injection tube 16, and the partition plate 17 is obliquely fixed on the inner side wall of the front housing 6 where the seed drop port 19 is located and the central column 25. Between them, the annular cavity jointly formed by the central cylinder 25 and the inner side wall of the front casing 6 is divided into a seed discharge area and a seed drop area.

There is a chamfer at the edge of the front surface of the seeding tray 2 ; and at the edge of the front surface of the seeding tray 2 , four hole inserts 3 are evenly and detachably arranged along the circumference of the seed tray 2 .

The front end of the hole insert 3 is provided with a first side wall 20, a second side wall 21 and an inner side wall 22; the first side wall 20 and the second side wall 21 protrude toward the front of the hole insert 3, The inner side wall 22 connects the first side wall 20 and the second side wall 21 .

The type hole inserter 3 is installed on the seeding tray 2, and rotates along with the seeding tray 2 from the first side wall 20 to the second side wall 21; during the rotation, the first side wall 20 and the second side wall The edges of the two side walls 21 facing the outer edge of the circumference of the seed tray 2 are adjacent to the slopes of the first arc segment 26 and the second arc segment 27 .

The front end faces of the first side wall 20, the second side wall 21 and the inner side wall 22 of the hole inserter 3 together form a hole 23 with an opening towards the outer edge of the seed tray 2 for accommodating a corn seed. The front end surface of the inner wall 22 constitutes the bottom surface 28 of the hole 23 , and the bottom surface 28 of the hole is an inclined plane inclined from the inside of the seed tray 2 to the outer edge of the seed tray 2 .

The shaft 4 drives the seed disc 2 to rotate along the direction passing through the first arc segment 26 and the second arc segment 27 of the seed protection plate 18 in sequence.

The seed stirring wheel 5 is affixed to the front surface of the seed-discharging disc 2, and the seed-stirring wheel 5 is concentrically arranged with the seed-discharging disc 2; The stirring teeth on the surface, each group of stirring teeth corresponds to a type hole insert 3 respectively, each group of stirring teeth includes the first stirring teeth 15 and the second stirring teeth 24, the first stirring teeth 15 and the second stirring teeth The teeth 24 form a stirring space in which a hole insert 3 is accommodated.

The upper edge of the partition plate 17 is in close proximity to the front end of the stirring teeth of the stirring wheel 5 rotated to its rear.

The inclination angle of the inclined portion of the first arc segment 26 is 30°, the inclination angle of the inclined portion of the second arc segment 27 is 45°, and the width of the inclined portion of the second arc segment 27 is smaller than that of the first circle The width of the inclined portion of the arc segment 26.

The partition plate 17 has an inclination angle of 30° with respect to the vertical direction.

The inner surface of the front casing 6 is provided with a spiral seed guide groove corresponding to the seed tube 16 .

The front edge of the first side wall 20 protrudes from the front edges of the second side wall 21 and the inner side wall 22 to form a seed stirring protrusion.

The inclination angle of the bottom surface 28 of the hole 23 is the same as that of the chamfer on the seed tray 2 .

The annular wheel body of the stirring wheel 5 is concentric with the central cylinder 25 and has the same radius; together.

The edge of the front surface of the seeding tray 2 is evenly provided with four hole insertion slots 10 along the circumference of the seed tray 2, and grooves 11 are provided on the side walls of the same side of the four hole insertion slots 10; The hole insert 3 is provided with a boss 12 corresponding to the groove 11 , and the hole insert 3 is detachably mounted on the seeding tray 2 through cooperation between the boss 12 and the groove 11 .

The inner wall of the seed-stirring space formed by the first seed-stirring teeth 15 and the second seed-stirring teeth 24 adopts an arc-shaped structure.

The distance between the upper edge of the partition plate 17 and the front end face of the stirring teeth of the stirring wheel 5 rotated to its rear is 1mm.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention uses air delivery to fill the seeds, which solves the problem of poor seed filling performance caused by the accumulation of the original population in the seed meter.

2. The present invention further reduces the possibility of population accumulation by adopting the method of airflow and seed stirring wheel to stir the seeds, which provides a prerequisite for increasing the rotation speed of the seed meter.

3. The present invention adopts the method of replaceable hole plug-in, which is suitable for corn seeds of different varieties and shapes, ensuring the applicability of the seed metering device.

4. The present invention designs a seed protection plate with variable width and variable angle to realize the functions of seed protection and clearing. The structure is simple, convenient and practical.

Description of drawings

Fig. 1 is the structural decomposition schematic diagram of the pneumatic high-speed corn metering device of the present invention;

Fig. 2 a is the front full sectional view of the pneumatic high-speed corn seed metering device of the present invention;

Fig. 2 b is a left full sectional view of the pneumatic high-speed corn seed metering device of the present invention;

The assembly diagram of the rear casing 1 and the front casing 6 of Fig. 2c;

FIG. 3 is a schematic structural view of the rear housing 1;

Figure 4a is a rear view of the front housing 6;

Figure 4b is a schematic structural view of the front housing 6;

Fig. 5 is the structural representation of seed protection plate 18;

Fig. 6 is a schematic structural view of the seeding tray 2;

Fig. 7 is a schematic structural view of a hole insert 3;

Fig. 8 is a schematic structural view of the shaft 4;

Fig. 9 a is the structural representation of stirring wheel 5;

Fig. 9b is an assembly state diagram of the stirring wheel 5, the seeding disc 2 and the hole insert 3;

FIG. 10 is a diagram showing the mating state of the seed protection plate 18, the seed tray 2 and the hole insert 3. FIG.

The reference signs therein are:

1 Rear housing 2 Seed tray

Type 3 hole insert 4 axis

5 Stirring wheel 6 Front housing

7 Fixing bolt 8 Bearing mounting hole

9 Rack ears 10-hole insert slot

11 Groove 12 Boss

13 Fixing plate 14 Sprocket fixing hole

15 First stirring tooth 16 Seed inlet tube

17 Partition board 18 Seed protection board

19 Seed drop opening 20 First side wall

21 Second side wall 22 Inner side wall

23 hole 24 second stirring teeth

25 Center cylinder 26 First arc segment

27 The second arc segment 28 Bottom surface of the hole

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, Figure 2a and Figure 2b, a pneumatic high-speed corn metering device includes a rear housing 1, a seeding disc 2, a hole insert 3, a shaft 4, a stirring wheel 5 and a front housing 6.

As shown in FIG. 2 c , the rear housing 1 is fixedly connected to the front housing 6 through fixing bolts 7 to form a seed meter housing.

As shown in Figure 3, the rear casing 1 is disc-shaped, and a pair of frame connecting ears 9 are symmetrically arranged on its outer edge; a bearing mounting hole 8 is provided at the center of the rear casing 1; The surface has an accommodating space for accommodating the seeding tray 2 .

As shown in FIG. 4 a and FIG. 4 b , the front housing 6 includes a seed inlet tube 16 , a partition plate 17 , a seed protection plate 18 , a seed drop port 19 and a central cylinder 25 .

The central cylinder 25 is arranged at the center of the front casing 6 and forms an annular cavity together with the inner side wall of the front casing 6 .

As shown in Figure 5, the seed protection plate 18 is a circle fixed on the rear edge of the inner side wall of the front housing 6, whose length is three-quarters of the circumference of the inner side wall rear edge of the front housing 6. Arc-shaped plate body, the head end of the seed protection plate 18 is positioned on the horizontal axis of the front casing 6, and the end is positioned on the vertical axis of the front casing 6, and the top and one side of the inner side wall rear edge of the front casing 6 The lower part is surrounded, and the inner side wall of the lower part of the front casing 6 corresponding to the part not surrounded is provided with a seed drop opening 19 .

The seed protection plate 18 has a first arc segment 26 and a second arc segment 27 from the head end to the end, wherein the length of the second arc segment 27 is the circumference of the rear edge of the inner side wall of the front housing 6 a quarter of. The front edges of the first arc segment 26 and the second arc segment 27 have an inclined portion bent towards the center of the circle, the inclination angle of the inclined portion of the first arc segment 26 is 30°, and the second arc segment 26 has an inclination angle of 30°. The inclination angle of the inclined portion of the segment 27 is 45°, and the width of the inclined portion of the second arc segment 27 is smaller than the width of the inclined portion of the first arc segment 26 .

When the seed drop opening 19 is arranged on the inner side wall of the rear side of the lower left part of the front housing 6, the seed injection pipe 16 passes horizontally from the side wall of the lower left part of the front housing 6 into the center of the An annular cavity formed by the cylinder 25 and the inner side wall of the front housing 6; 16 horizontally enters the annular cavity formed by the central cylinder 25 and the inner side wall of the front housing 6 from the side wall at the front side of the lower right part of the front housing 6 .

A partition plate 17 is arranged between the seed drop port 19 and the seed injection tube 16, and the partition plate 17 is obliquely fixed on the inner side wall of the front housing 6 where the seed drop port 19 is located and the central column 25. Between them, the annular cavity jointly formed by the central cylinder 25 and the inner side wall of the front casing 6 is divided into a seed discharge area and a seed drop area. Wherein, the area where the seed drop port 19 is located is the seed drop area.

Preferably, the partition plate 17 has an inclination angle of 30° with respect to the vertical direction.

Preferably, the inner surface of the front housing 6 is provided with a spiral seed guide groove corresponding to the seed tube 16 , so that corn seeds can smoothly enter the seed discharge area of the annular cavity from the seed tube 16 .

As shown in FIG. 6 , the seed tray 2 is circular and has a certain thickness, and has a chamfer of 35° at the edge of its front surface. A shaft hole corresponding to the bearing mounting hole 8 of the rear casing 1 is provided at the center of the seed metering disc 2 . At the edge of the front surface of the seed disk 2 , four hole inserts 3 are detachably and evenly arranged along the circumference of the seed disk 2 .

As shown in Figure 7, the front end of the hole insert 3 is provided with a first side wall 20, a second side wall 21 and an inner side wall 22; the first side wall 20 and the second side wall 21 face the hole insert 3 protrudes from the front, and the inner side wall 22 connects the first side wall 20 and the second side wall 21 .

The hole insert 3 is installed on the seeding tray 2 and rotates along with the seeding tray 2 from the first side wall 20 to the second side wall 21 . During the rotation, the edges of the first side wall 20 and the second side wall 21 facing the outer edge of the seed disk 2 are in close proximity to the slopes of the first arc segment 26 and the second arc segment 27 .

The front end faces of the first side wall 20, the second side wall 21 and the inner side wall 22 of the hole inserter 3 together form a hole 23 with an opening towards the outer edge of the seed tray 2 for accommodating a corn seed. The front end surface of the inner wall 22 constitutes the bottom surface 28 of the hole 23 , and the bottom surface 28 of the hole is an inclined plane inclined from the inside of the seed tray 2 to the outer edge of the seed tray 2 .

The front edge of the first side wall 20 protrudes from the front edges of the second side wall 21 and the inner side wall 22 to form a seed stirring protrusion, which can well play the role of seed stirring and improve the fluidity of seeds.

The inclination angle of the bottom surface 28 of the hole 23 is the same as that of the chamfer on the seed tray 2 .

Preferably, the edge of the front surface of the seeding tray 2 is evenly provided with four type hole insert grooves 10 along the circumference of the seed tray 2, and the side walls of the same side of the four type hole insert grooves 10 are provided with concave holes. Groove 11; the hole insert 3 is provided with a boss 12 corresponding to the groove 11, and the hole insert 3 is detachably mounted on the seeding tray 2 through the mutual cooperation of the boss 12 and the groove 11, The four hole inserts 3 rotate from the first side wall 20 to the second side wall 21 along with the seeding tray 2 .

As shown in FIG. 8 , one end of the shaft 4 is provided with a fixing plate 13 , and the other end is provided with a sprocket fixing hole 14 for connecting with the driving sprocket. Described shaft 4 is affixed at the center of circle of seed-discharging disc 2 by fixing plate 13, and the other end passes through the axle hole of seed-discharging disc 2 and the bearing installation hole 8 of the rear housing 1 that bearing is installed in order to protrude outwards. The shaft 4 drives the seed disc 2 to rotate along the direction passing through the first arc segment 26 and the second arc segment 27 of the seed protection plate 18 in sequence.

As shown in Fig. 9a and Fig. 9b, the seed stirring wheel 5 is fixedly connected to the front surface of the seed-discharging tray 2, and the seed-stirring wheel 5 and the seed-discharging tray 2 are concentrically arranged. The stirring wheel 5 includes an annular wheel body and four groups of stirring teeth fixed on the outer surface of the wheel, each group of stirring teeth corresponds to a type hole insert 3, and each group of stirring teeth includes the first stirring teeth 15 and the second stirring tooth 24, the first stirring tooth 15 and the second stirring tooth 24 form a stirring space, and a type hole insert 3 is accommodated therebetween, which is conducive to improving the fluidity of the seeds near the type hole 23.

The annular wheel body of the stirring wheel 5 is concentric with the central cylinder 25 and has the same radius.

The ends of the first stirring tooth 15 and the second stirring tooth 24 are flush with the inner edge of the chamfer on the seed disk 2 .

The seeding tray 2 is made of tough material, so that the hole plug-in 3 can be installed and replaced.

Preferably, the inner wall of the seed stirring space formed by the first seed stirring teeth 15 and the second seed stirring teeth 24 adopts an arc-shaped structure, so as to avoid damage to the corn seeds in the case of high-speed rotation.

The upper edge of the partition plate 17 is in close proximity to the front end of the stirring teeth of the stirring wheel 5 rotated to its rear. Preferably, the distance between the upper edge of the partition plate 17 and the front end face of the stirring teeth of the stirring wheel 5 rotated behind it is 1mm.

The mating state of the seed protection plate 18 with the seed metering tray 2 and the hole insert 3 is shown in FIG. 10 . Since the inclined portion of the first arc segment 26 and the second arc segment 27 is closely matched with the edge of the first side wall 20 and the second side wall 21 of the hole insert 3 towards the outer edge of the seed tray 2, and the second Compared with the first arc segment 26, the inclination angle of the inclined part of the second arc segment 27 becomes larger and the width narrows. The excess corn seeds ensure the single seed rate.

Working process of the present invention is as follows:

The rotation of the shaft 4 drives the seeding disc 2 to rotate, and the rotation of the seeding disc 2 drives the four hole inserts 3 connected thereto and the stirring wheel 5 to rotate, and the seeds enter from the seeding tube 16 with the airflow, and are filled and rotated to the lower end The type hole insert 3. Under the clamping effect of the type hole plug-in 3 and the seed protection plate 18, the seeds filled into the type hole plug-in 3 rotate thereupon. 26 and the inclined portion of the second arc segment 27 fit with the opening of the hole inserter 3 towards the circumference outer edge of the seed disk 2, and the second arc segment 27 is relative to the first arc segment 26, and its inclined portion The angle of inclination becomes larger and the width becomes narrower. At this time, only single seeds can be accommodated in the type hole insert 3, and the redundant seeds do centrifugal movement under the support force of the seed protection plate 18 and the effect of airflow to break away from the type hole insert 3, and get thrown to The inner wall surface of the front housing 6 slides back to the bottom of the seed meter along the partition plate 17, and merges with the seeds that have just entered the seed meter 2 under the action of the stirring wheel 5 and the air flow, and then refills the seed again.

The single seed that stays in the type hole inserter 3 continues to rotate with the type hole inserter 3, until the second arc section 27 of the seed protection plate 18. Without the wrapping of the seed protection plate 18, the seeds lack the supporting force, so they break away from the hole insert 3 under the action of their own gravity, and discharge the seed metering device along the seed drop port 19 to complete the whole seed metering process.

The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and can also be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. Variations.

Claims (10)

1. a kind of pneumatic transmission formula high speed seed of maize, including back casing (1), discharge plate (2), axis (4) and procapsid (6)；It is described Back casing (1) is fixedly connected with each other with procapsid (6), constitutes seeder unit shell；The back casing (1) is disc, back casing (1) There is inner surface the accommodation space for accommodating discharge plate (2), the circle centre position of back casing (1) to be equipped with bearing mounting hole (8)；The seeding Disk (2) is rounded, and there is certain thickness, the circle centre position of discharge plate (2) to be equipped with the bearing mounting hole (8) of back casing (1) relatively The axis hole answered；One end of the axis (4) is equipped with fixed plate (13), and the sprocket wheel that the other end is equipped with for being connect with drive sprocket is fixed Hole (14)；The axis (4) is fixed in the circle centre position of discharge plate (2) by fixed plate (13), and the other end sequentially passes through discharge plate (2) Axis hole and the back casing (1) that is equipped with bearing bearing mounting hole (8) it is protruding；It is characterized in that：

The feed mechanism for seed further comprises type hole plug-in unit (3) and stirs kind of a wheel (5)；

The procapsid (6) includes seed input pipe (16), demarcation strip (17), seeds protecting plate (18), planting mouth (19) and center column (25)；

Center column (25) setting collectively forms one at the center of procapsid (6), and with the internal side wall of procapsid (6) Ring-shaped cavity；

The seeds protecting plate (18) is one to be fixed in inside on the internal side wall rear of procapsid (6), length is procapsid (6) The head end of 3/4ths arc-shaped plate body of side wall rear circumference, seeds protecting plate (18) is located on the horizontal axis of procapsid (6), End is located on the vertical axis of procapsid (6), and the top of the internal side wall rear of procapsid (6) and a side lower part are surrounded, The internal side wall of procapsid (6) lower part corresponding to not besieged part is equipped with planting mouth (19)；

The seeds protecting plate (18) has the first arc section (26) and the second arc section (27) successively from head end to end, wherein institute The length for stating the second arc section (27) is a quarter of the internal side wall rear circumference of procapsid (6)；First arc section (26) and the leading edge of the second arc section (27) has a rake to center of circle bending；

When the internal side wall that the planting mouth (19) is arranged on rear side of the procapsid (6) lower left quarter, the seed input pipe (16) Flatly the side wall from front side of procapsid (6) lower left quarter is passed through the internal side wall by center column (25) and procapsid (6) The ring-shaped cavity collectively formed；When the internal side wall that the planting mouth (19) is arranged on rear side of the procapsid (6) right lower quadrant, Side wall of the seed input pipe (16) flatly from front side of procapsid (6) right lower quadrant is passed through described by center column (25) and procapsid (6) ring-shaped cavity that internal side wall collectively forms；

Demarcation strip (17) is disposed between the planting mouth (19) and seed input pipe (16), demarcation strip (17) is obliquely fixed in institute State where planting mouth (19) between the internal side wall and center column (25) of procapsid (6), will it is described by center column (25) and The ring-shaped cavity that the internal side wall of procapsid (6) collectively forms is divided into seeding area and fall-sowing area；

The front surface edge of the discharge plate (2) has a chamfering；The front surface edge of the discharge plate (2), along seeding The circumference of disk (2) is removably uniformly provided with four type hole plug-in units (3)；

The front end face of the type hole plug-in unit (3) is equipped with the first side wall (20), second sidewall (21) and madial wall (22)；Described first Side wall (20) and second sidewall (21) are protruded towards the front of type hole plug-in unit (3), and the madial wall (22) connects first side Wall (20) and second sidewall (21)；

The type hole plug-in unit (3) is mounted on discharge plate (2), and with discharge plate (2) from the first side wall (20) to second sidewall (21) direction rotation；In rotation process, the circumference of the first side wall (20) and second sidewall (21) towards discharge plate (2) Rake of the edge of outer rim close to first arc section (26) and the second arc section (27)；

The front end face of the first side wall (20) of the type hole plug-in unit (3), second sidewall (21) and madial wall (22) collectively forms one It is open and is used to accommodate the type hole (23) of a corn seed towards the circumferential outer edge of discharge plate (2), before the madial wall (22) End face constitutes the type hole bottom surface (28) of the type hole (23), and the type hole bottom surface (28) is internal to discharge plate from discharge plate (2) (2) the inclined inclined-plane of circumferential outer edge；

The axis (4) passes through the first arc section (26) and the second arc section of seeds protecting plate (18) with dynamic metering plate (2) along sequence (27) direction rotation；

The front surface stirred kind of wheel (5) and be fixed in discharge plate (2), stirs kind of wheel (5) and is arranged with discharge plate (2) concentric；Stir kind Wheel (5) includes kind of the tooth that stirs that a cyclic annular wheel body and four groups are fixed in the wheel external surface, and every group is stirred kind of tooth and correspond to one respectively Type hole plug-in unit (3), every group is stirred kind of tooth and stirs kind of a tooth (15) and second including first and stir kind of a tooth (24), and first stirs kind of a tooth (15) and second It stirs kind of a tooth (24) composition one and stirs kind of a space, a type hole plug-in unit (3) is accommodated therebetween；

The top edge of the demarcation strip (17) stirs kind the front end face for stirring kind of tooth of wheel (5) close to turning to described in its rear.

2. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：First arc section (26) The inclination angle of rake is 30 °, the inclination angle of the rake of second arc section (27) is 45 °, and the second arc section (27) incline The width of inclined portion is less than the width of the rake of the first arc section (26).

3. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：The demarcation strip (17) with it is vertical Direction has 30 ° of inclination angle.

4. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：The interior table of the procapsid (6) Spiral shape seed guiding groove corresponding with seed input pipe (16) is provided on face.

5. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：The first side wall (20) front Edge protrudes from the leading edge of second sidewall (21) and madial wall (22), and kind of a protrusion is stirred in formation.

6. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：The type hole bottom of the type hole (23) Face (28) is identical as the angle of inclination of chamfering on discharge plate (2).

7. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：It is described to stir kind of a ring-type for wheel (5) Wheel body is concentric with center column (25) and radius is equal；Described first, which stirs kind of a tooth (15) and second, stirs end and the row of kind of a tooth (24) Chamfering inward flange in discharge plate (2) is concordant.

8. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：The preceding table of the discharge plate (2) Face edge along discharge plate (2) even circumferential set there are four type hole card slots (10), four type hole card slots (10) it is same The side wall of side is equipped with groove (11)；The type hole plug-in unit (3) is equipped with boss (12) corresponding with the groove (11), Type hole plug-in unit (3) is removably mounted on by boss (12) and groove (11) mutual cooperation on discharge plate (2).

9. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：Described first stir kind of a tooth (15) and Second inner wall for stirring kind of space for stirring kind of a tooth (24) composition uses arcuate structure.

10. pneumatic transmission formula high speed seed of maize according to claim 1, it is characterised in that：The demarcation strip (17) it is upper Edge and described the distance between kind of the front end face for stirring kind of tooth of wheel (5) that stirs for turning to its rear are 1mm.