CN113575050B - Parabolic self-disturbing seed tray with bowl-shaped hole pattern and seed sowing device - Google Patents

Parabolic self-disturbing seed tray with bowl-shaped hole pattern and seed sowing device Download PDF

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CN113575050B
CN113575050B CN202110803903.3A CN202110803903A CN113575050B CN 113575050 B CN113575050 B CN 113575050B CN 202110803903 A CN202110803903 A CN 202110803903A CN 113575050 B CN113575050 B CN 113575050B
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seed
disturbing
bowl
notch
air chamber
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CN113575050A (en
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李兆东
夏守浩
刘涛
张甜
陈永新
陈黎卿
王韦韦
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Anhui Agricultural University AHAU
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • A01C7/20—Parts of seeders for conducting and depositing seed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2

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Abstract

The invention relates to the technical field of seed metering devices, and particularly discloses a parabolic self-disturbing seed tray with bowl-shaped hole patterns and a seed metering device, wherein the self-disturbing seed tray comprises a circular tray body and a positioning hole arranged at the center of the circular tray body, the outer circle surface of the circular tray body is annularly provided with a plurality of parabolic notches in an array manner, the hole patterns on the outer surfaces of the notches are in a bowl-mouth shape, and disturbing teeth are formed on the circular tray body between every two adjacent notches; the seed sowing device comprises a shell and a sealing cover connected with the end surface of a notch of the shell, wherein an air chamber separating ring is arranged on the circular inner wall of the shell, a seed disturbing disc is arranged between the air chamber separating ring and the sealing cover, and a material sucking hole position for sucking seeds is formed between the notch on the seed disturbing disc and the air chamber separating ring; the invention discloses a bowl-shaped hole naturally formed between a seed disturbing disc and a gas chamber separating ring in a seed sowing device, which can realize quantitative adsorption of seeds under complex working conditions, simplify the structure of the whole seed disturbing disc and the seed sowing device and reduce the processing cost of an air-suction type seed sowing device.

Description

Parabolic self-disturbing seed tray with bowl-shaped hole pattern and seed sowing device
Technical Field
The invention relates to the technical field of seed metering devices, and particularly discloses a self-disturbing seed tray with bowl-shaped hole patterns and a parabolic shape and a seed metering device.
Background
The most core seed metering devices in pneumatic seed metering machines, pneumatic seed metering devices, have been widely used for the sowing of seeds such as rapeseed, soybean, corn, etc. The structural design of a seed metering disc in the prior seed metering device is that a plurality of material absorbing holes are formed in an annular array at the outer edge of a disc, seeds are absorbed on the material absorbing holes through negative pressure, and the absorbed seeds are discharged through positive pressure after rotating to a certain position along with the seed metering disc, so that the seeds are fed and discharged.
The invention discloses a groove tooth combined type seed discharging disc for discharging spherical small-sized seeds at a high speed, which is disclosed by the invention patent with the application number of 2018106678647, wherein a positioning hole is arranged at the center of the seed discharging disc, a plurality of constraint grooves which are arranged concentrically with the positioning hole and are distributed at intervals are arranged on the seed discharging disc, a seed disturbing tooth is formed between any two adjacent constraint grooves, a first adsorption channel is arranged on each constraint groove, and a second adsorption channel is arranged on each seed disturbing tooth. The invention adopts the groove-tooth combined structural design to realize directional disturbance on the population during seeding, breaks through the stable accumulation state of the population, quickly separates a small amount of seeds from the population, enters a fixed annular groove channel, is freely captured and accurately adsorbed by an adsorption channel, improves the seeding efficiency of the seeds and realizes high-speed seeding. However, the groove-tooth combined seed metering disc with the structural design has the following defects in the aspect of practical application: firstly, the seed plate is suitable for small-particle spherical seeds like rapeseeds, but cannot be suitable for large-particle non-spherical seeds like corns, and the disturbance effect of the seed plate on the seeds is common; secondly, when the seeder runs in the actual seeding process, the seeding apparatus can vibrate and tilt due to the complex ground, and the problem of broken strips caused by the fact that the filling leakage easily occurs in the holes formed in the upper seeding plate under the complex working condition is solved; thirdly, the existing fluted disc needs to be grooved firstly in the actual preparation process, then holes are formed in the fluted disc, and finally the positions of the slotted holes need to be polished for deburring, so that the processing steps of the whole seed metering disc are complex. Therefore, in order to overcome the defects of the seed sowing plate in the conventional pneumatic seed sowing device, the application provides a self-disturbing seed sowing plate with a bowl-shaped hole type and a parabola shape and a pneumatic seed sowing device provided with the self-disturbing seed sowing plate, which can solve the technical problems.
Disclosure of Invention
The invention aims to provide a self-disturbing seed plate with a bowl-shaped hole type and a parabola shape and a pneumatic seed sowing device provided with the self-disturbing seed plate, which can solve the technical problems, aiming at the defects that the existing seed sowing plate cannot be suitable for large-particle and non-spherical seeds and is easy to leak and fill under complex working conditions.
The invention is realized by the following technical scheme:
the utility model provides a from disturbing kind of dish with bowl form pass, parabola form, includes circular disk body and sets up the locating hole in circular disk body centre of a circle department, a plurality of parabola form's notch has been seted up to the excircle personally submitting annular array form of circular disk body, just the pass of notch is the bowl mouth form, adjacent two circular disk body between the notch has formed disturbing tooth.
Preferably, the number of the notches formed in the circular tray body is 18-32, and the specific number of the notches is determined according to the size of the circular tray body and the type of seeds.
Preferably, the diameter D of the outer surface of the bowl-shaped hole on the notch1Satisfies the following conditions:
Figure 100002_DEST_PATH_IMAGE001
in the formula
Figure 100002_DEST_PATH_IMAGE002
Is the maximum value of the seed length.
Preferably, the diameter D of the inner surface of the bowl-shaped hole on the notch is2Satisfies the following conditions:
Figure 100002_DEST_PATH_IMAGE003
in the formula
Figure 100002_DEST_PATH_IMAGE004
Is the average width of the seed, an
Figure 100002_DEST_PATH_IMAGE005
Wherein
Figure 100002_DEST_PATH_IMAGE006
Is the average length of the seed,
Figure 100002_DEST_PATH_IMAGE007
Is the average width of the seed,
Figure 100002_DEST_PATH_IMAGE008
Is the average thickness of the seed.
Preferably, the parabolic notch has a total length L0And satisfies the relation:
Figure 100002_DEST_PATH_IMAGE009
in the formula
Figure 100002_DEST_PATH_IMAGE010
Is the maximum value of the seed length.
Preferably, the included angle α between the upper groove wall of the notch and the vertical line satisfies:
Figure 100002_DEST_PATH_IMAGE011
。
the seed sowing device provided with the seed disturbing disc comprises a shell of a pneumatic seed sowing device and a sealing cover connected with the end face of a notch of the shell, wherein an air chamber separating ring is arranged on the circular inner wall of the shell, the seed disturbing disc is arranged between the air chamber separating ring and the sealing cover, the inner diameter of the air chamber separating ring is smaller than the diameter of the circular disc body and larger than the diameter of an annular line formed by connecting the inner ends of a plurality of notches, and a material sucking hole position for sucking seeds is formed between each notch and the air chamber separating ring.
Preferably, the ratio of the length of the overlapped part of the notch and the air chamber separating ring to the length of the material suction hole is 1.5-2.
As a further arrangement of the above scheme, a shaft sleeve assembly is concentrically arranged in the air chamber partition ring, a radial partition plate is connected between the shaft sleeve assembly and the air chamber partition ring, the partition plate divides the interior of the shell into an air blowing cavity and an air suction cavity, and an air inlet pipe communicated with the air blowing cavity and an air exhaust pipe communicated with the air suction cavity are connected to the outer circular surface of the shell.
Has the advantages that:
1) according to the seed disturbing disc disclosed by the invention, the plurality of notches in parabolic shapes and bowl-mouth hole shapes are uniformly formed on the outer circular surface of the disc body, so that seeds are easily charged into the material sucking hole position formed by the notch and the air chamber separating ring in the rotation process of the seed disturbing disc and are stably adsorbed by negative pressure airflow, and the problem of strip breakage caused by the leakage charging of the hole shape under complex working conditions such as vibration and inclination is solved.
2) The special notch structural design is adopted for the seed disturbing disc, so that the parabolic notches and the disturbing teeth formed between the adjacent notches can assist in disturbing the population in the seed filling chamber in the rotation process of the seed disturbing disc, the inter-seed accumulation state is broken, the linear velocity equivalent to that of the seed disc is obtained by utilizing the seeds, the seed capturing is favorably realized under the condition of not increasing the negative pressure, and the seed disturbing disc is particularly suitable for seeding of large-particle and non-spherical seeds such as corn, soybean and the like.
3) The invention discloses a bowl-shaped hole naturally formed between a seed disturbing disc and a gas chamber separating ring in a pneumatic seed sowing device, which can realize quantitative adsorption of seeds under complex working conditions, simplify the structure of the whole seed disturbing disc and the seed sowing device and reduce the processing cost of the pneumatic seed sowing device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a top plan view of the parabolic notch of the present invention;
FIG. 3 is a side cross-sectional view of a parabolic notch in accordance with the present invention;
FIG. 4 is a schematic plan view of the outer casing and seed disturbing plate assembly of the pneumatic seed sowing device of the present invention;
FIG. 5 is a schematic perspective view of a portion of the outer housing of the pneumatic seed metering device of the present invention;
fig. 6 is an enlarged schematic view of the structure at a in fig. 4 according to the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will now be described in detail with reference to the accompanying figures 1-6, in conjunction with an illustrative embodiment.
Example 1
This embodiment 1 discloses a parabolic self-disturbing seed tray with a bowl-shaped hole pattern, referring to fig. 1, the seed-disturbing tray body includes a circular tray body 1, a positioning hole 2 is opened at the center of the circular tray body 1, and the positioning hole 2 can be designed as a spline hole, a kidney-shaped hole or other non-circular shape when specifically setting. When the circular disc body 1 is arranged in the pneumatic seed sowing device, the seed sowing shaft is inserted into the positioning hole 2, so that the circular disc body 1 can synchronously rotate along with the seed sowing shaft.
A plurality of notches 101 are uniformly formed in an annular array shape on the outer circle surface of the circular disc body 1, the notches 101 are parabolic, the hole patterns on the notches 101 are bowl-shaped, and disturbance teeth 102 are formed on the circular disc body 1 between every two adjacent notches 101. In the actual design process, the number of the notches formed in the circular tray body 1 is determined according to the size of the actual seed disturbing tray, and is generally set to be 18-32.
The method is characterized in that corn planting is used as an application object, and various parameters of a parabolic notch on a seed disturbing disc are designed as follows:
referring to FIG. 2, the diameter D of the inner surface of the bowl-shaped hole on the seed disturbing plate 12The size design is according to agricultural machine design manual air-suction type seed metering ware type hole computational formula:
Figure DEST_PATH_IMAGE012
wherein, in the step (A),
Figure DEST_PATH_IMAGE013
is the average width of the corn seed.
Figure 770729DEST_PATH_IMAGE013
The calculation formula of (2) is as follows:
Figure DEST_PATH_IMAGE014
(ii) a In the formula
Figure DEST_PATH_IMAGE015
Is the average length of the seed, measured as 10.4 mm;
Figure DEST_PATH_IMAGE016
is the average width of the seed, measured as 8.2 mm;
Figure DEST_PATH_IMAGE017
the average thickness of the seed was measured to be 5.8 mm.
Figure DEST_PATH_IMAGE018
=5.0~5.2, therefore D2Take 5.0 mm.
The diameter D of the outer surface of the bowl-shaped hole on the seed disturbing plate 11When the size of the seed disturbing disc is designed, the good seed disturbing effect and the good seed filling performance of the seed disturbing disc are ensured, and the contact area between the seeds and the notches is enlarged as much as possible by the parabolic notches. Therefore, the major diameter D is satisfied1Should be greater than the maximum length of the corn seed, then
Figure DEST_PATH_IMAGE019
Wherein a is the maximum value of the length of the corn seeds, the measured length value of the corn seeds is mainly concentrated at 10-13 mm, and if a is 13mm, D is obtained1Take 14 mm.
The seed sowing process ensures that the corn seeds can be completely filled into the parabolic notch 100, and has good seed disturbing effect and seed filling performance, and the total length L of the parabolic shaped hole0The distance L from the outer end of the parabolic notch 101 to the center of the hole is required to be about 1.5 times of the length of the corn seed:
Figure DEST_PATH_IMAGE020
then L is 12.5 mm.
In addition, the corn seeds are in the seed filling areaThe transverse pushing force from the notches on the seed disturbing disc is applied, so that the seed disturbing effect is achieved. Because of the irregular shape of the corn seeds, the contact area between the notch and the seeds is ensured to be enough, namely the part of the corn seeds which is sunk into the notch is larger than the thickness of the corn seeds
Figure DEST_PATH_IMAGE021
In order to avoid the phenomenon of seed jamming during the seed cleaning process, the part of the seed sunk into the notch is not more than the thickness of the seed
Figure DEST_PATH_IMAGE022
。
Referring to FIG. 3, the following relationship can be found according to the adsorption state of corn seeds:
Figure DEST_PATH_IMAGE023
wherein
Figure DEST_PATH_IMAGE024
And when h is the corn seed flat filling type hole notch in the formula, the seed width direction exceeds the length of the notch depth, because the corn seed appearance is irregular, for the convenience of calculation, the appearance of the corn seed is simplified into a rectangle, and the angle alpha is the included angle between the boundary of the notch and the vertical line. b is the minimum width of the corn seeds, the measured width range of the corn seeds is mainly concentrated between 7.5mm and 11mm, b at the position is 7.5mm, c is the minimum value of the thickness of the corn seeds, the measured thickness of the corn seeds is mainly concentrated between 4mm and 8mm, and c is 4 mm. Finally, through the formula:
Figure DEST_PATH_IMAGE025
is calculated to obtain
Figure DEST_PATH_IMAGE026
。
In the above formula: the larger the value of alpha is, the more favorable the seed clearing is, the phenomenon that the corn seeds are clamped in the notches in the seeding process is reduced, the smaller the value of alpha is, the larger the transverse pushing force of the notches on the seeds is, the better disturbance effect of the seed group is favorably realized, and therefore, under the condition of avoiding the seed clamping, a smaller angle alpha is selected to obtain the better disturbance effect, and the value of alpha is 58.5 degrees at the moment.
Example 2
Embodiment 2 discloses a pneumatic seed metering device based on embodiment 1 seed disturbing plate, and referring to fig. 4, fig. 5 and fig. 6, the pneumatic seed metering device comprises an outer shell 3, a sealing cover (not shown in the figure) is connected to the end surface of a notch of the outer shell 3 through a screw, a base 9 is connected to the lower end of the outer shell 3, and the whole seed metering device can be installed on a seeding machine through the arrangement of the base 9. An air chamber separating ring 4 is arranged on the circular inner wall of the outer shell 3, and the outer wall of the air chamber separating ring 4 is attached to the circular inner wall of the outer shell 3 for fixing. A shaft sleeve component 5 which is concentric with the air chamber separating ring 4 is arranged in the middle of the air chamber separating ring 4, and a seed shaft (not shown in the figure) is inserted in the bearing sleeve component 5. Then, the seed disturbing disk in the embodiment 1 is arranged between the air chamber separating ring 4 and the sealing cover, and the positioning hole 2 on the seed disturbing disk is matched with the seed shaft, so that the seed disturbing disk rotates between the air chamber separating ring 4 and the sealing cover under the action of the rotation of the seed shaft.
When setting, the following requirements are met: the inner diameter of the air chamber separating ring 4 is smaller than the diameter of the circular disc body 1 of the seed disturbing disc, and the inner diameter of the air chamber separating ring 4 is larger than the diameter of an annular line 100 formed by connecting the inner ends of a plurality of notches 100 on the circular disc body 1, so that a material sucking hole position 200 for sucking seeds can be formed between each notch 100 and the air chamber separating ring 4. Referring to fig. 4, in the specific arrangement, the length of the overlapped part of the notch 100 and the air chamber separating ring 4
Figure DEST_PATH_IMAGE027
Length of the material suction hole site 200
Figure DEST_PATH_IMAGE028
The design that the ratio range is controlled to be within 1.5-2 is the best, not only can have better disturbance effect to the population, but also can carry out effective absorption to the seed.
Finally, other components of the whole pneumatic seed sowing device are the same as the existing structural design, and as will be briefly explained below, two radial partition plates 6 are connected between the shaft sleeve assembly 5 and the air chamber partition ring 4, the partition plates 6 divide the interior of the casing 3 into an air blowing chamber and an air suction chamber, and an air inlet pipe 7 and an air suction pipe 8 are connected to the outer circular surface of the outer casing 3, wherein the air inlet pipe 7 is communicated with the air blowing chamber, and the air suction chamber of the air suction pipe 8 is communicated. The air outlet end and the air exhaust end of the air pump are respectively connected with the air inlet pipe 7 and the air exhaust pipe 8 through pipelines, negative pressure can be formed in the air suction cavity under the action of the air pump, and the lower end of the storage bin arranged at the outer end of the sealing cover is communicated with the air suction cavity. When the seeds in the bin are accumulated at the lower end of the seed disturbing plate, the seeds can be adsorbed in the material sucking hole position 200 under the action of negative pressure. When the adsorbed seeds rotate to the air blowing cavity along with the seed disturbing plate, the negative pressure immediately becomes positive pressure adsorption force and disappears, and the seeds in the material sucking hole positions 200 immediately fall down and are discharged from the discharging hopper.
When the pneumatic seed sowing device disclosed in the embodiment 2 is used for sowing corn seeds, the corn seeds are placed in the hopper, the corn seeds in the hopper fall into the lower end of the space between the seed disturbing plate and the sealing cover from the lower end of the hopper, and the area corresponds to the air suction cavity. When the seed disturbing plate rotates along with the seed discharging shaft, the parabolic notch 101 and the disturbing teeth 102 formed between the two adjacent notches can effectively disturb the seed group, break the accumulation state between the seeds, obtain the linear velocity equivalent to that of the seed plate by using the seeds, and enable the corn seeds to be quickly captured by the material sucking hole position 200 formed between the notch 101 and the air chamber separating ring 4. Meanwhile, because the hole pattern of the notch 101 is bowl-shaped, namely the upper end of the notch 101 is large and the lower end is small, corn seeds are easier to fill into the formed material sucking hole 200 and then are stably adsorbed by negative pressure airflow, even if the seeder vibrates or inclines due to running on a complex ground, the seeds can still be effectively captured and adsorbed, the problem that the broken strips are caused by leaking filling of the holes in the straight hole design of the existing seed sowing plate under complex working conditions of vibration, inclination and the like is effectively solved, and the structural design of the whole seed disturbing plate is more suitable for sowing large-particle and non-spherical seeds.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A self-disturbing seed tray with bowl-shaped hole patterns and parabolic shapes comprises a circular tray body (1) and a positioning hole (2) arranged at the center of the circle of the circular tray body (1), and is characterized in that a plurality of parabolic notches (101) are formed in the outer circle surface of the circular tray body (1) in an annular array shape, the hole pattern of each notch (101) is bowl-shaped, and disturbing teeth (102) are formed on the circular tray body (1) between every two adjacent notches (101);
wherein the parabolic notch (101) has a total length L0And satisfies the relation:
Figure DEST_PATH_IMAGE001
in the formula
Figure DEST_PATH_IMAGE002
Is the maximum value of the seed length;
the diameter D of the outer surface of the bowl-mouth-shaped hole on the notch (101)1Satisfies the following conditions:
Figure DEST_PATH_IMAGE003
in the formula
Figure 397961DEST_PATH_IMAGE002
Is the maximum value of the seed length;
the inner surface diameter D of the bowl-shaped hole on the notch (101)2Satisfies the following conditions:
Figure DEST_PATH_IMAGE004
in the formula
Figure DEST_PATH_IMAGE005
Is the average width of the seed, and
Figure DEST_PATH_IMAGE006
in which
Figure DEST_PATH_IMAGE007
Is the average length of the seed,
Figure DEST_PATH_IMAGE008
Is the average width of the seed,
Figure DEST_PATH_IMAGE009
Is the average thickness of the seed;
the included angle alpha between the upper groove wall of the groove opening (101) and the vertical line meets the following requirements:
Figure DEST_PATH_IMAGE010
。
2. the parabolic self-disturbing tray with the bowl-shaped hole patterns according to claim 1, wherein the number of the notches (101) formed in the circular tray body (1) is 18-32.
3. A seed sowing device provided with a self-disturbing seed disc of any one of claims 1 to 2, which comprises a shell (3) of a pneumatic seed sowing device and a sealing cover connected with the end surface of a notch of the shell (3), wherein an air chamber separating ring (4) is arranged on the circular inner wall of the shell (3), the self-disturbing seed disc is arranged between the air chamber separating ring (4) and the sealing cover, the inner diameter of the air chamber separating ring (4) is smaller than the diameter of the circular disc body (1) and larger than the diameter of a ring line (100) formed by connecting the inner ends of a plurality of notches (101), and a material sucking hole position (200) for sucking seeds is formed between the notches (101) and the air chamber separating ring (4).
4. The seed metering device according to claim 3, characterized in that the length of the overlapped part of the notch (101) and the air chamber separating ring (4) is equal to the length of the material suction hole (200)
Figure DEST_PATH_IMAGE011
The ratio is in the range of 1.5-2.
5. The seed metering device according to claim 3, characterized in that a shaft sleeve assembly (5) is concentrically arranged in the air chamber separating ring (4), a radial clapboard (6) is connected between the shaft sleeve assembly (5) and the air chamber separating ring (4), the clapboard (6) divides the inner part of the shell (3) into an air blowing cavity and an air suction cavity, and an air inlet pipe (7) communicated with the air blowing cavity and an air suction pipe (8) communicated with the air suction cavity are connected to the outer circular surface of the shell (3).
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