A centrifugal corn high-speed precision seed metering device with disturbance-assisted seed filling

Abstract

The present invention relates to a centrifugal high-speed precision corn seed metering device with disturbance-assisted seed filling, comprising a front housing, an agitating wheel, a profile hole plug-in, a seeding disk, a rear housing, a shaft, a screw, a first bearing, and a second bearing; the seed metering device further comprises a disturbance step; when the profile hole plug-in rotates to the right side of the rear housing along with the seeding disk, the semi-cylindrical surface of the semi-cylindrical portion contacts the disturbance contact surface of the disturbance step, and the disturbance step pushes the profile hole plug-in to slide axially within the profile hole plug-in mounting groove; thereby breaking the static state of the seed population accumulated in the profile hole groove, solving the problem of missed seeding caused by accumulation, and after passing a certain angle, the profile hole plug-in is repositioned back to its original position by the limiting ring of the front housing. The present invention has a compact structure, a wider operating speed range, and reduces the time cost of use. The seed metering device is suitable for sowing small plots on flat terrain, can realize the function of high-speed precision corn seeding, and improves work efficiency.

Description

Technical Field

[0001] The invention relates to a centrifugal corn high-speed precision seed metering device with disturbance-assisted seed filling, belonging to the technical field of agricultural machinery. Background Art

[0002] Corn, as an important food crop and energy source, is vital to human life. It not only provides a rich source of nutrition but is also widely used in food processing, feed, industrial production, and biofuels. Corn also plays a crucial role in agricultural development, providing farmers with stable incomes and employment opportunities. Its vast cultivated area and high yields contribute to alleviating global pressures on food security and energy demand. Corn, therefore, plays an indispensable role in human society, contributing significantly to economic development, improving food supply, and protecting the environment. Corn seed meters play a crucial role in corn production, improving efficiency, ensuring quality, increasing yields, and reducing labor intensity. They are a result of the advancement of modern agricultural technology and have positive implications for the sustainable development of the corn industry. Currently, the predominant high-speed seed meter used in China is pneumatic, which has high airflow requirements and is expensive. There are two types of centrifugal corn seed meters: mechanical and air-feed. Both are currently in the preliminary development stage. The seeding qualification rate of existing mechanical seed meters lags significantly behind that of established pneumatic seed meters, and they also cause significant seed damage. Air-feed seed meters are complex and sensitive to airflow fluctuations. Moreover, numerical simulation and bench tests have shown that in existing centrifugal corn seeding devices, multiple seeds often accumulate at the hole plug-in port, which may result in missed seeding. Summary of the Invention

[0003] To address the issues of mechanical high-speed precision corn seeding devices causing seeds to accumulate at the orifice during high-speed seeding, preventing them from being filled, and the violent collision of seed-clearing seeds with the front housing, the present invention provides a centrifugal high-speed precision corn seeding device with disturbance-assisted seed filling. This device utilizes an orifice plug and a disturbance step to disrupt the stable, stationary state of the seeds. A seed-clearing baffle and a transition baffle form a parabolic and elliptical composite seed-clearing trajectory that effectively reduces seed impact and collisions with the housing. The device boasts a compact structure, high efficiency, and reduced manufacturing and operating costs. It achieves high-speed precision corn seeding and improves the device's qualification rate.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A centrifugal corn high-speed precision seed meter with disturbance-assisted seed filling comprises a front housing 1, an agitating wheel 2, a shaped hole plug 3, a seeding disc 4, a rear housing 6, a shaft 7, a screw 8, a first bearing 10 and a second bearing 11; the seed meter further comprises a disturbance step 5.

[0006] A rear shell center axis hole 603 is provided at the center of the rear shell 6; the edge of the rear shell center axis hole 603 extends backward to form a rear shell axis hole boss 607, which constitutes a space for accommodating the first bearing 10 and the second bearing 11; an annular groove 604 with the center of the rear shell 6 as the center of the circle is provided near the edge of the front surface of the rear shell 6; four rear shell through holes 602 are evenly arranged on the outer circumference of the annular groove 604; a rear shell hanging ear 601 is provided at the upper and lower ends of the rear shell 6, respectively, for fixing the rear shell 6 to the frame of the seeding unit by bolts; a disturbance step mounting groove 606 for mounting the disturbance step 5 is provided on the right side of the front surface of the rear shell 6, near the inner side of the annular groove 604, and two disturbance step connecting holes 605 are provided in the bottom plane of the disturbance step mounting groove 606.

[0007] The first bearing 10 and the second bearing 11 are arranged adjacent to each other in the shaft hole annular boss 607 and are separated by a certain distance by an annular flange provided on the inner wall of the shaft hole annular boss 607 .

[0008] The rear part of the shaft 7 is provided with a shaft shoulder 703, the front part is provided with two parallel parallel surfaces 702, and the front shaft end is provided with a threaded hole 701; the middle part of the shaft 7 is located in the inner ring of the first bearing 10 and the second bearing 11, and the shaft shoulder 703 contacts the rear end face of the inner ring of the second bearing 11 to perform axial positioning of the second bearing 11.

[0009] The front end face of the disturbance step 5 is a disturbance contact curved surface 503, and the rear end face is a horizontal mounting surface 502; the horizontal mounting surface 502 is provided with two connecting columns 501 corresponding one to one with the disturbance step connecting holes 605; the disturbance step 5 is fastened in the disturbance step mounting groove 606 through interference fit between the connecting columns 501 and the disturbance step connecting holes 605, and the horizontal mounting surface 502 is in close contact with the bottom plane of the disturbance step mounting groove 606.

[0010] The seeding disc 4 is a disc with a certain thickness, and its side surfaces are a frustum surface 406 and a cylindrical surface 407 from front to back.

[0011] A seed disc center axis hole 402 is provided at the center of the seed disc 4; a stirring wheel center axis hole 202 is provided at the center of the stirring wheel 2; the seed disc center axis hole 402 and the stirring wheel center axis hole 202 are both composed of a pair of mutually parallel planes and a pair of curved surfaces corresponding to the front structure of the shaft 7; the stirring wheel 2 and the seed disc 4 are respectively fixed to the front of the shaft 7 through the stirring wheel center axis hole 202 and the seed disc center axis hole 402 in sequence; the screw 8 is screwed into the threaded hole 701 of the shaft 7 to axially lock the stirring wheel 2, the seed disc 4, the first bearing 10, the second bearing 11 and the rear shell 6.

[0012] The edge of the central axis hole 402 of the seeding disk extends backward to form a seeding disk axis hole boss 405, so that after assembly, the seeding disk axis hole boss 405 contacts the front end face of the inner ring of the first bearing 10, axially positioning the first bearing 10, and spacing the rear surface of the seeding disk 4 and the front surface of the rear shell 6 by a certain distance; a pair of positioning holes 401 for fixing the stirring wheel 2 is provided on the front surface of the seeding disk 4; four hole plug-in mounting grooves 404 for accommodating the hole plug-in 3 are evenly provided along the circumference of the edge of the seeding disk 4, and after assembly, the axis of the hole plug-in 3 is located on the extension line of the radius of the seeding disk 4; a pair of sliding grooves 403 parallel to the axis of the shaft 7 are provided on the left and right side walls of the hole mounting groove 404.

[0013] The shaped hole plug-in 3 is composed of a shaped hole portion 306 at the front and a semi-cylindrical portion 303 at the rear; a stirring ear 301 parallel to the axis of the shaped hole plug-in 3 and a shaped hole slot 302 for accommodating seeds are provided on the left side of the shaped hole portion 306.

[0014] The hole groove 302 is formed by lofting and cutting the upper and lower sections, so that the hole groove 302 formed by lofting and cutting has a horizontal bottom surface 302-1, a left side surface 302-2, a right side surface 302-3, a first inner side surface 302-4 and a second inner side surface 302-5.

[0015] A pair of sliding bosses 305 corresponding to the sliding groove 403 of the hole plug-in mounting groove 404 are provided on the left and right sides of the hole portion 306; the inner side surfaces of the hole portion 306 and the semi-cylindrical portion 303 are located in the same vertical plane; the outer side surface of the hole portion 306 is a first arc surface, and the outer side surface of the semi-cylindrical portion 303 is a second arc surface; the hole plug-in 3 can be freely slidably arranged in the hole plug-in mounting groove 404 of the seed disc 4 through the cooperation of the sliding bosses 305 and the sliding groove 403 of the hole plug-in mounting groove 404.

[0016] When the type hole plug-in 3 is completely placed in the type hole plug-in mounting groove 404 without axial movement, the first arc surface of the type hole portion 306 is coplanar with the frustum surface 406 of the seeding disk 4, and the second arc surface of the semi-cylindrical portion 303 is coplanar with the cylindrical surface 407 of the seeding disk 4; the front end surface of the stirring ear 301 protrudes from the front surface of the seeding disk 4 and is coplanar with the front surface of the stirring wheel 2; the semi-cylindrical surface of the semi-cylindrical portion 303 protrudes from the rear surface of the seeding disk 4; when the type hole plug-in 3 rotates to the right side of the rear shell body 6 with the seeding disk 4, the semi-cylindrical surface of the semi-cylindrical portion 303 contacts the disturbance contact surface 503 of the disturbance step 5, and the disturbance step 5 pushes the type hole plug-in 3 to slide axially in the type hole plug-in mounting groove 404; a limiting boss 304 is provided on the second arc surface of the semi-cylindrical portion 303.

[0017] The stirring wheel 2 is disc-shaped, and a positioning column 201 corresponding to the positioning hole 401 is provided on the rear surface of the stirring wheel 2; four stirring teeth 203 corresponding to the hole plug-in 3 are evenly arranged along the circumference of the edge of the stirring wheel 2; the ends of the stirring teeth 203 are in contact with the inner side of the hole plug-in 3, and the stirring teeth 203 are arranged in the same line as the stirring ears 301 of the hole plug-in 3; every two adjacent stirring teeth 203, the edge of the disc of the stirring wheel 2 and the edge of the seeding disk 4 form a seed filling area.

[0018] The front housing 1 includes an integrally formed flat shell plate 101 , a frustoconical side shell plate 102 , a cylindrical side shell plate 103 , a seed filling pipe 104 , a return pipe 105 and a seed dropping pipe 106 .

[0019] The plane shell plate 101, the frustum side shell plate 102 and the cylindrical side shell plate 103 are distributed in sequence from the center to the edge to form the front shell body; the outer surface of the cylindrical side shell plate 103 is evenly provided with four front shell lifting ears 108 in the circumference, which are used to be bolted to the rear shell through hole 602 of the rear shell 6. After assembly, the edge of the cylindrical side shell plate 103 is located in the annular groove 604 of the rear shell 6; the outer surface of the cylindrical side shell plate 103 is circumferentially provided with a limiting ring 109, which consists of a notch arc 109-1 and a limiting arc 109-2. The limiting arc 109-2 can be inserted into the mold hole after assembly. The notch arc 109-1 contacts the limiting boss 304 of the part 3 to limit the axial movement of the hole plug-in 3; the notch arc 109-1 corresponds to the position of the disturbance step 5, the head and end of the notch arc 109-1 are respectively located at 80° and 120° counterclockwise, and there is a transition curve between the end of the notch arc 109-1 and the limiting arc 109-2, so that the hole plug-in 3 loses the axial restriction of the limiting arc 109-2 when it contacts the disturbance step 5, thereby generating axial movement, and then the hole plug-in 3 is restored in the hole plug-in mounting groove 404 under the action of the transition curve and the limiting arc 109-2.

[0020] The seed filling tube 104 is vertically arranged on the left side of the outer surface of the plane shell 101 near the vertical axis position of the front shell 1, and the seed filling port 107 at the lower end of the seed filling tube 104 is connected to the lower part of the plane shell 101, and the seed filling port 107 corresponds to the seed filling area.

[0021] The return pipe 105 is arranged obliquely on the left side of the outer surface of the plane shell plate 101, the left end of the return pipe 105 is connected to the left side of the frustum side shell plate 102, and the right end of the return pipe 105 is connected to the seed filling port 107 of the seed filling pipe 104.

[0022] The seeding tube 106 is vertically arranged on the lower left side of the frustum side shell plate 102, and the seeding port 113 at the upper end of the seeding tube 106 is connected to the frustum side shell plate 102; the seeding port 113 is located at a position between 270° and 320° counterclockwise of the frustum side shell plate 102, and corresponds to the first arc surface of the shaped hole portion 306 of the shaped hole plug-in 3.

[0023] The upper left portion of the frustum side shell plate 102, i.e. the portion of the front shell 1 at 160° to 270° counterclockwise from the lowest point of the front shell 1 at 0°, is provided with a seed clearing baffle 111 and a transition baffle 112 in sequence; wherein the transition baffle 112 is located at the portion at 250° to 270°.

[0024] The seed-clearing baffle 111 and the transition baffle 112 are both composed of lofted curved surfaces. In the counterclockwise direction, the radius from the outer edge of the seed-clearing baffle 111 and the transition baffle 112 to the axis center gradually increases, and the axial distance between the inner surface of the seed-clearing baffle 111 and the transition baffle 112 and the seed-disc 4 gradually increases, forming a parabolic and elliptical composite seed-clearing trajectory from the head end of the seed-clearing baffle 111 to the left port of the return pipe 105, so that when the hole plug-in 3 rotates with the seed-disc 4 to the seed-clearing baffle 111, the seeds not in the hole groove 302 enter the return pipe 105 along the seed-clearing trajectory under the action of centrifugal force, and then converge with the seeds in the seed-filling tube 104 at the seed-filling port 107 to enter the seed cavity, while the seeds in the hole groove 302 leave the seed-disc through the seed-dropping port 113 of the seed-dropping tube 106 along with the hole plug-in 3, thereby realizing precision sowing.

[0025] A gasket 9 is provided between the screw 8 and the stirring wheel 2 .

[0026] The upper cross-section of the hole groove 302 is an isosceles trapezoid with an upper base of 9.5mm, a lower base of 13mm and a height of 5.5mm, and an isosceles trapezoid with an upper base of 5.5mm, a lower base of 7.25mm and a height of 5.5mm in the upper left corner, with two obtuse corners with a 3mm rounded corner; the lower cross-section of the hole groove 302 is a square with a side length of 14mm and a 5×7mm rectangle cut out of the upper right corner.

[0027] The radius ratio of the stirring wheel 2 to the seeding disc 4 is 1:1.6; the length ratio of the stirring teeth 203 to the radius of the stirring wheel 2 is 1:7.5.

[0028] The maximum height d of the middle portion of the disturbance step 5 is 1.5±5 mm.

[0029] The disturbance contact surface 503 is composed of a lofted surface of an inner projection curve 503-1 and an outer projection curve 503-2; the inner projection curve 503-1 is formed by projecting a circular arc with a radius of 31 mm onto a cylindrical surface with a radius of 110 mm along the axis of shaft 7; the outer projection curve 503-2 is formed by projecting a circular arc with a radius of 37 mm onto a cylindrical surface with a radius of 120 mm along the axis of shaft 7.

[0030] The included angle between the generatrix of the frustum 406 and the axis of the shaft 7 is 45°; the included angle between the generatrix of the remaining parts of the frustum side shell 102 except the seed clearing baffle 111 and the transition baffle 112 and the axis of the shaft 7 is 45°.

[0031] A central boss 110 is provided on the inner surface of the plane shell plate 101 , and the outer diameter of the central boss 110 is equal to the radius of the stirring wheel 2 .

[0032] The distance between the axis of the seed filling tube 104 and the vertical axis of the front housing 1 is 30 mm.

[0033] The angle between the axis of the return pipe 105 and the horizontal plane is 30°.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention forces the hole plug-in to slide in the axial direction through the collision between the hole plug-in and the disturbance step, thereby breaking the static state of the population accumulated in the hole groove and solving the problem of missed seeding caused by accumulation. After a certain angle, the hole plug-in is repositioned to its original position by the limiting ring of the front shell.

[0036] 2. The stirring teeth of the stirring wheel of the present invention are shorter and the radius of the stirring wheel body is larger, the purpose of which is to reduce the radial size of the internal chamber of the seed metering device, reduce excessive seed jumping in the radial direction, and make the seed flow more regular.

[0037] 3. The front shell of the present invention is integrated and has a more compact structure. The front shell has a seed-clearing baffle and a transition baffle, forming a seed-clearing trajectory that is a combination of a parabola and an ellipse and effectively reduces seed impact. The seeds that are not in the shaped hole groove enter the return pipe along the seed-clearing trajectory under the action of centrifugal force and converge with the seeds in the seed filling tube at the seed filling port to enter the seed cavity. The seeds in the shaped hole groove leave the seed meter through the seed filling port of the seed filling tube along the shaped hole plug-in, thereby realizing precision sowing.

[0038] 4. The shaped hole slots of the shaped hole plug-in of the present invention can reduce the situation where multiple seeds are filled into the shaped hole slots side by side, effectively reducing reseeding.

[0039] 5. The present invention can adapt to different working speeds of the seed metering device by replacing the disturbance steps with different heights and different curvatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the exploded structure of the centrifugal high-speed precision seed metering device for corn with disturbance-assisted seed filling according to the present invention;

[0041] Figure 2a This is a schematic diagram of the main structure of the centrifugal high-speed precision seed metering device for corn with disturbance-assisted seed filling according to the present invention;

[0042] Figure 2b This is a left-side structural schematic diagram of the centrifugal high-speed precision seed metering device for corn with disturbance-assisted seed filling according to the present invention;

[0043] Figure 2c This is a schematic top view of the centrifugal high-speed precision seed metering device for corn with disturbance-assisted seed filling according to the present invention;

[0044] Figure 3 for Figure 2a AA sectional structural diagram of the seed meter;

[0045] Figure 4a-4b Schematic diagram of the structure of the rear housing 6;

[0046] Figure 5 It is a structural diagram of shaft 7;

[0047] Figure 6a It is a structural diagram of the disturbance step 5;

[0048] Figure 6b is a schematic structural diagram of the disturbed contact surface 503;

[0049] Figure 7a It is a front view of the seed tray 4;

[0050] Figure 7b It is a cross-sectional view of the BB section of the seed disc 4;

[0051] Figure 8a It is a structural diagram of the hole plug-in 3;

[0052] Figure 8b Schematic diagram of the structure of the hole groove 302;

[0053] Figure 9 Schematic diagram of the structure of the stirring wheel 2;

[0054] Figure 10a-10b Schematic diagram of the assembly of the stirring wheel 2, the hole plug-in 3, the seeding disc 4 and the rear housing 6;

[0055] Figures 11a to 11eSchematic diagram of the structure of the front shell 1.

[0056] The accompanying drawings are as follows:

[0057] 1 Front housing

[0058] 101 plane shell plate 102 round table side shell plate

[0059] 103 cylindrical side shell plate 104 seed filling pipe

[0060] 105 return pipe 106 seeding pipe

[0061] 107 Seed filling port 108 Front shell lifting ear

[0062] 109 limiting ring 109-1 notch arc

[0063] 109-2 limit arc 110 center boss

[0064] 111 seed clearing baffle 112 transition baffle

[0065] 113 seeding port

[0066] 2 stirring wheels

[0067] 201 Positioning column 202 Stirring wheel center shaft hole

[0068] 203 stirring teeth

[0069] Type 3 hole insert

[0070] 301 stirring ear 302 type hole slot

[0071] 302-1 horizontal bottom surface 302-2 left side

[0072] 302-3 right side 302-4 first inner side

[0073] 302-5 Second inner side

[0074] 303 semi-cylindrical portion 304 limiting boss

[0075] 305 sliding boss 306 hole

[0076] 4 seed trays

[0077] 401 positioning hole 402 seed disc center axis hole

[0078] 403 sliding slot 404 type hole plug-in installation slot

[0079] 405 seeding plate shaft hole boss 406 round table

[0080] 407 cylindrical surface

[0081] 5 Disturbance Steps

[0082] 501 connecting column 502 horizontal mounting surface

[0083] 503 Perturbation Contact Surface

[0084] 503-1 Inner projection curve 503-2 Outer projection curve

[0085] 6 Rear housing

[0086] 601 rear shell ear 602 rear shell through hole

[0087] 603 rear housing center axis hole 604 annular groove

[0088] 605 Disturbance step connection hole 606 Disturbance step installation groove

[0089] 607 rear housing shaft hole boss

[0090] 7-axis

[0091] 701 threaded hole 702 parallel surface

[0092] 703 shoulder

[0093] 8 screws

[0094] 9 gasket

[0095] 10 First bearing

[0096] 11 Second bearing DETAILED DESCRIPTION

[0097] The present invention will be further described below with reference to the accompanying drawings and examples.

[0098] like Figure 1 、 Figure 2a 、 Figure 2b 、 Figure 2c and Figure 3 As shown, the centrifugal corn high-speed precision seed metering device with disturbance-assisted seed filling of the present invention includes a front shell 1, an agitating wheel 2, a hole plug-in 3, a seeding disc 4, a disturbance step 5, a rear shell 6, a shaft 7, a screw 8, a first bearing 10 and a second bearing 11.

[0099] like Figure 4a and Figure 4bAs shown, the rear housing 6 is provided with a rear housing central axis hole 603 at its center; the edge of the rear housing central axis hole 603 extends rearward to form a rear housing axis hole boss 607, which forms a space for accommodating the first bearing 10 and the second bearing 11; an annular groove 604 is provided near the edge of the front surface of the rear housing 6, with the center of the rear housing 6 as its center; four rear housing through holes 602 are evenly distributed around the outer circumference of the annular groove 604; the upper and lower ends of the rear housing 6 are respectively provided with a rear housing hanging ear 601, which is used to secure the rear housing 6 to the frame of the seeding unit via bolts. A disturbance step mounting groove 606 for mounting the disturbance step 5 is provided near the inner side of the annular groove 604 on the right side of the front surface of the rear housing 6 (i.e., at the lowest point of the rear housing 6 at 0° counterclockwise and 90°). Two disturbance step connection holes 605 are provided in the bottom plane of the disturbance step mounting groove 606.

[0100] like Figure 3 As shown, the first bearing 10 and the second bearing 11 are arranged adjacent to each other in the shaft hole annular boss 607 in the front and back directions, and are separated by a certain distance by an annular flange provided on the inner wall of the shaft hole annular boss 607 .

[0101] like Figure 5 As shown, the rear part of the shaft 7 is provided with a shaft shoulder 703, the front part is provided with two parallel parallel surfaces 702, and the front shaft end is provided with a threaded hole 701; the middle part of the shaft 7 is located in the inner ring of the first bearing 10 and the second bearing 11, and the shaft shoulder 703 contacts the rear end face of the inner ring of the second bearing 11 to axially position the second bearing 11.

[0102] like Figure 6a and Figure 6b As shown, the front end face of the disturbance step 5 is a disturbance contact curved surface 503, and the rear end face is a horizontal mounting surface 502; two connecting columns 501 corresponding to the disturbance step connecting holes 605 are provided on the horizontal mounting surface 502; the disturbance step 5 is fastened in the disturbance step mounting groove 606 through interference fit between the connecting columns 501 and the disturbance step connecting holes 605, and the horizontal mounting surface 502 is in close contact with the bottom plane of the disturbance step mounting groove 606.

[0103] like Figure 1 、 Figure 7a and Figure 7b As shown, the seed disc 4 is a disc with a certain thickness, and its side surfaces are a frustum 406 and a cylindrical surface 407 from front to back; the angle between the generatrix of the frustum 406 and the axis of the shaft 7 is 45°.

[0104] like Figure 7a and Figure 9As shown, the center of the seed disc 4 is provided with a seed disc central axis hole 402; the center of the stirring wheel 2 is provided with a stirring wheel central axis hole 202. Both the seed disc central axis hole 402 and the stirring wheel central axis hole 202 are composed of a pair of mutually parallel flat surfaces and a pair of curved surfaces corresponding to the front structure of the shaft 7. The stirring wheel 2 and seed disc 4 are respectively fixed to the front of the shaft 7 through the stirring wheel central axis hole 202 and the seed disc central axis hole 402. The screw 8 is screwed into the threaded hole 701 of the shaft 7, axially locking the stirring wheel 2, seed disc 4, first bearing 10, second bearing 11, and rear housing 6 to ensure that they do not move axially. A gasket 9 is provided between the screw 8 and the stirring wheel 2.

[0105] The edge of the central axis hole 402 of the seed disc extends rearward to form a seed disc axis hole boss 405. After assembly, the seed disc axis hole boss 405 contacts the front end surface of the inner ring of the first bearing 10, axially positioning the first bearing 10 and ensuring a certain distance between the rear surface of the seed disc 4 and the front surface of the rear housing 6, ensuring that the seed disc 4 does not contact the rear housing 6 during high-speed rotation. A pair of positioning holes 401 for fixing the stirring wheel 2 are provided on the front surface of the seed disc 4; four shaped hole plug-in mounting grooves 404 for accommodating the shaped hole plug-in 3 are evenly distributed along the circumference of the edge of the seed disc 4. After assembly, the axis of the shaped hole plug-in 3 is located on the extension line of the radius of the seed disc 4; a pair of sliding grooves 403 parallel to the axis of the shaft 7 are provided on the left and right side walls of the shaped hole mounting groove 404.

[0106] like Figure 8a As shown, the shaped hole plug 3 is composed of a shaped hole portion 306 at the front and a semi-cylindrical portion 303 at the rear; a stirring ear 301 parallel to the axis of the shaped hole plug 3 and a shaped hole slot 302 for accommodating seeds are provided on the left side of the shaped hole portion 306;

[0107] like Figure 8b As shown, the shaped hole groove 302 is formed by lofting and cutting the upper and lower sections, the upper section is an isosceles trapezoid with an upper base of 9.5mm, a lower base of 13mm and a height of 5.5mm, and the upper left corner is an isosceles trapezoid with an upper base of 5.5mm, a lower base of 7.25mm and a height of 5.5mm, and the two obtuse angles on the upper part are 3mm rounded; the lower section is a square with a side length of 14mm, and a 5×7mm rectangle is cut out from the upper right corner; the shaped hole groove 302 formed by lofting and cutting has a horizontal bottom surface 302-1, a left side surface 302-2, a right side surface 302-3, a first inner side surface 302-4 and a second inner side surface 302-5. This shaped hole structure can effectively avoid the problem of reseeding caused by filling seeds into the shaped holes side by side.

[0108] A pair of sliding bosses 305 corresponding to the sliding groove 403 of the hole plug-in mounting groove 404 are provided on the left and right sides of the hole portion 306; the inner side surfaces of the hole portion 306 and the semi-cylindrical portion 303 are located in the same vertical plane; the outer side surface of the hole portion 306 is a first arc surface, and the outer side surface of the semi-cylindrical portion 303 is a second arc surface; the hole plug-in 3 can be freely slidably arranged in the hole plug-in mounting groove 404 of the seed disc 4 through the cooperation of the sliding bosses 305 and the sliding groove 403 of the hole plug-in mounting groove 404.

[0109] like Figure 10a and Figure 10b As shown, when the shaped hole plug-in 3 is fully seated in the shaped hole plug-in mounting groove 404 and does not move axially, the first arc surface of the shaped hole portion 306 is coplanar with the frustum surface 406 of the seed disc 4, and the second arc surface of the semi-cylindrical portion 303 is coplanar with the cylindrical surface 407 of the seed disc 4. The front end surface of the stirring ear 301 protrudes from the front surface of the seed disc 4 and is coplanar with the front surface of the stirring wheel 2. The semi-cylindrical surface of the semi-cylindrical portion 303 protrudes from the rear surface of the seed disc 4. When the shaped hole plug-in 3 rotates to the right side of the rear housing 6 along with the seed disc 4, the semi-cylindrical surface of the semi-cylindrical portion 303 contacts the disturbance contact surface 503 of the disturbance step 5, which pushes the shaped hole plug-in 3 to slide axially within the shaped hole plug-in mounting groove 404. A limiting boss 304 is provided on the second arc surface of the semi-cylindrical portion 303.

[0110] like Figure 9 As shown, the stirring wheel 2 is disc-shaped, and a positioning column 201 corresponding to the positioning hole 401 is provided on the rear surface of the stirring wheel 2; four stirring teeth 203 corresponding to the hole plug 3 are evenly provided along the circumference of the edge of the stirring wheel 2; Figure 10a As shown, the ends of the stirring teeth 203 contact the inner side of the hole insert 3, and the stirring teeth 203 are arranged in a straight line with the stirring ears 301 of the hole insert 3. Every two adjacent stirring teeth 203, the edge of the disc of the stirring wheel 2 and the edge of the seeding disc 4 form a seed filling area.

[0111] The radius ratio of the stirring wheel 2 to the seeding disc 4 is 1:1.6; the length ratio of the stirring teeth 203 to the radius of the stirring wheel 2 is 1:7.5, which reduces the radial size of the seed filling area and reduces excessive seed jumping in the radial direction, making the seed flow more regular.

[0112] The stirring ears 301 and the stirring teeth 203 work together to capture a seed, drive the seed to perform a circular motion at a common speed, and fill the seed into the molded hole groove 302 under the action of centrifugal force to complete the seed filling process.

[0113] The height of the disturbance step 5 will affect the acceleration of the hole plug-in 3 when it slides in the axial direction. If the height of the hole plug-in 3 is large and the curvature of the disturbance contact surface 503 is large, the collision between the disturbance step 5 and the hole plug-in 3 during the initial contact will be more intense, resulting in more intense axial vibration of the hole plug-in 3, causing the seeds to vibrate too violently, which is not conducive to subsequent seed filling; if the height of the hole plug-in 3 is small and the curvature of the disturbance contact surface 503 is small, the collision between the two will be small and no disturbance effect will be achieved.

[0114] like Figure 6a As shown, the maximum height d of the middle portion of the disturbance step 5 is 1.5±5 mm.

[0115] like Figure 6b As shown, the disturbance contact surface 503 is composed of a lofted surface of an inner projection curve 503-1 and an outer projection curve 503-2; the inner projection curve 503-1 is formed by projecting a circular arc with a radius of 31 mm onto a cylindrical surface with a radius of 110 mm along the axis of shaft 7; the outer projection curve 503-2 is formed by projecting a circular arc with a radius of 37 mm onto a cylindrical surface with a radius of 120 mm along the axis of shaft 7; the curvature of the contact surface can be controlled by changing the radius of the projection arc and the projection surface, and the smaller the radius of the projection arc and the projection cylindrical surface, the better.

[0116] like Figures 11a to 11e As shown, the front housing 1 includes an integrally formed flat shell plate 101, a frustum side shell plate 102, a cylindrical side shell plate 103, a seed filling pipe 104, a return pipe 105 and a seed dropping pipe 106;

[0117] The plane shell plate 101, the frustum side shell plate 102 and the cylindrical side shell plate 103 are sequentially distributed from the center to the edge to form the front shell body; the outer surface of the cylindrical side shell plate 103 is evenly provided with four front shell hanging ears 108 around the circumference, which are used to be bolted to the rear shell through hole 602 of the rear shell 6. After assembly, the edge of the cylindrical side shell plate 103 is located in the annular groove 604 of the rear shell 6; the outer surface of the cylindrical side shell plate 103 is provided with a limit ring 109 around the circumference. Figure 11eAs shown, the limiting ring 109 is composed of a notch arc 109-1 and a limiting arc 109-2. The limiting arc 109-2 can contact the limiting boss 304 of the hole plug-in 3 after assembly to limit the axial movement of the hole plug-in 3; the notch arc 109-1 corresponds to the position of the disturbance step 5, and the head and end of the notch arc 109-1 are respectively located at 80° and 120° counterclockwise, and there is a transition curve between the end of the notch arc 109-1 and the limiting arc 109-2, so that the hole plug-in 3 loses the axial restriction of the limiting arc 109-2 when it contacts the disturbance step 5, thereby generating axial movement, and then the hole plug-in 3 is re-positioned in the hole plug-in mounting groove 404 under the action of the transition curve and the limiting arc 109-2.

[0118] The inner surface of the planar shell plate 101 is provided with a central boss 110 , the outer diameter of which is equal to the radius of the stirring wheel 2 . On the one hand, it is used to improve the rigidity of the front shell 1 to prevent it from bending and deformation; on the other hand, it is used to limit the seed cavity space of the front shell 1 .

[0119] The seed filling tube 104 is vertically arranged on the left side of the outer surface of the plane shell 101 near the vertical axis position of the front shell 1, and the seed filling port 107 at the lower end of the seed filling tube 104 is connected to the lower part of the plane shell 101, and the seed filling port 107 corresponds to the seed filling area.

[0120] Preferably, the distance between the axis of the seed filling tube 104 and the vertical axis of the front housing 1 is 30 mm.

[0121] The return pipe 105 is arranged obliquely on the left side of the outer surface of the plane shell plate 101, and the left port of the return pipe 105 is connected to the left side of the conical side shell plate 102 (that is, the position of 270° counterclockwise when the lowest point of the front shell 1 is 0°), and the right port of the return pipe 105 is connected to the seed filling port 107 of the seed filling pipe 104.

[0122] The angle between the axis of the return pipe 105 and the horizontal plane is 30°.

[0123] The seeding tube 106 is vertically arranged on the lower left side of the frusto-conical side shell 102, and the seeding port 113 at the upper end of the seeding tube 106 is connected to the frusto-conical side shell 102. The seeding port 113 is located between 270° and 320° counterclockwise of the frusto-conical side shell 102 and corresponds to the first arc surface of the shaped hole portion 306 of the shaped hole insert 3. This prevents the situation where multiple seeds are filled into the non-shaped hole insert 3 and causes reseeding, which has a significant effect on reducing reseeding during low-speed operation.

[0124] The upper left portion of the frustum side shell plate 102, i.e., the portion of the front shell 1 where the lowest point of the front shell 1 is 0° and is 160° to 270° counterclockwise, is provided with a seed clearing baffle 111 and a transition baffle 112 in sequence; wherein, the transition baffle 112 is located at the portion between 250° and 270°; the angle between the generatrix of the remaining portion of the frustum side shell plate 102 except the seed clearing baffle 111 and the transition baffle 112 and the axis of the shaft 7 is 45°.

[0125] The seed cleaning baffle 111 and the transition baffle 112 are both composed of lofted curved surfaces. Along the counterclockwise direction, the radius of the outer edge of the seed cleaning baffle 111 and the transition baffle 112 to the axis center gradually increases, and the axial distance between the inner surface of the seed cleaning baffle 111 and the transition baffle 112 and the seeding disc 4 gradually increases, forming a parabola and ellipse composite from the head end of the seed cleaning baffle 111 to the left port of the return pipe 105 to effectively reduce the impact of seeds on the seed cleaning trajectory, so that when the hole plug-in 3 rotates with the seeding disc 4 to the seed cleaning baffle 111, the seeds not in the hole groove 302 enter the return pipe 105 along the seed cleaning trajectory under the action of centrifugal force, and then converge with the seeds in the seed filling tube 104 at the seed filling port 107 to enter the seed cavity, while the seeds in the hole groove 302 leave the seeding device through the seeding port 113 of the seeding tube 106 along with the hole plug-in 3, thereby realizing precision sowing.

[0126] The working process of the present invention is as follows:

[0127] The shaft 7 is connected to the motor through a coupling, which drives the other rotating parts of the seed metering device to move. The seeds enter the seed metering device through the seed filling tube 104 through the mechanical quantitative seed supply device. The movement of the seed disc 4 drives the stirring wheel 2 and the hole plug-in 3 to move together. After the seeds enter the seed metering device, they collide with the rotating stirring wheel 2 and the hole plug-in 3 and reach a common speed. The seeds contact the inner surface of the circular table side shell plate 102 and are filled into the hole groove 302 of the hole plug-in 3 under the action of centrifugal force. When the hole plug-in 3 moves to the disturbance step 5 and collides with the disturbance step 5, the axial restriction of the limit arc 109-2 is lost, thereby generating axial movement. The seeds also move with the hole plug-in 3, thereby breaking the static state of seed accumulation and playing a role in assisting seed filling. When the hole plug-in 3 does not contact the disturbance step 5 at all, the hole plug-in 3 is re-moved under the action of the transition curve and the limit arc 109-2 The new one is located in the mounting groove 404 of the shaped hole plug-in; subsequently, when the shaped hole plug-in 3 moves to the seed-clearing baffle 111, the radius of the outer edge of the seed-clearing baffle 111 and the transition baffle 112 to the axis center gradually increases in the counterclockwise direction, and the axial distance between the inner surface of the seed-clearing baffle 111 and the transition baffle 112 and the seed-disc 4 gradually increases, forming a parabolic and elliptical composite from the head end of the seed-clearing baffle 111 to the left port of the return pipe 105, which effectively reduces the impact of seeds on the seed-clearing trajectory. When the shaped hole plug-in 3 rotates with the seed-disc 4 to the seed-clearing baffle 111, the seeds not in the shaped hole groove 302 enter the return pipe 105 along the seed-clearing trajectory under the action of centrifugal force, and then converge with the seeds in the seed-filling tube 104 at the seed-filling port 107 to enter the seed cavity, while the seeds in the shaped hole groove 302 leave the seed-disc through the seed-dropping port 113 of the seed-dropping tube 106 along with the shaped hole plug-in 3, thereby realizing precision sowing.

Claims

1. A centrifugal corn high-speed precision seed metering device with disturbance-assisted seed filling, comprising a front housing (1), an agitating wheel (2), a hole plug (3), a seeding disc (4), a rear housing (6), a shaft (7), a screw (8), a first bearing (10) and a second bearing (11), characterized in that: The seed meter further comprises a disturbance step (5); The center of the rear shell (6) is provided with a rear shell central axis hole (603); the edge of the rear shell central axis hole (603) extends backward to form a rear shell axis hole boss (607), which constitutes a space for accommodating the first bearing (10) and the second bearing (11); the front surface of the rear shell (6) is provided with an annular groove (604) with the center of the rear shell (6) as the center of the circle near the edge; four rear shell through holes (602) are evenly arranged on the outer circumference of the annular groove (604); the upper and lower ends of the rear shell (6) are respectively provided with a rear shell hanging ear (601) for fixing the rear shell (6) to the frame of the seeding unit by bolts; a disturbance step mounting groove (606) for mounting the disturbance step (5) is provided on the right side of the front surface of the rear shell (6) and near the inner side of the annular groove (604), and two disturbance step connecting holes (605) are provided in the bottom plane of the disturbance step mounting groove (606); The first bearing (10) and the second bearing (11) are arranged adjacent to each other in the rear housing shaft hole boss (607) and are spaced a certain distance apart by an annular flange provided on the inner wall of the rear housing shaft hole boss (607); The shaft (7) is provided with a shaft shoulder (703) at the rear, two parallel parallel surfaces (702) at the front, and a threaded hole (701) at the front shaft end; the middle of the shaft (7) is located in the inner rings of the first bearing (10) and the second bearing (11), and the shaft shoulder (703) contacts the rear end face of the inner ring of the second bearing (11) to axially position the second bearing (11); The front end surface of the disturbance step (5) is a disturbance contact curved surface (503), and the rear end surface is a horizontal mounting surface (502); two connecting posts (501) corresponding to the disturbance step connecting holes (605) are provided on the horizontal mounting surface (502); the disturbance step (5) is fastened in the disturbance step mounting groove (606) through interference fit between the connecting posts (501) and the disturbance step connecting holes (605), and the horizontal mounting surface (502) is in close contact with the bottom plane of the disturbance step mounting groove (606); The seeding disc (4) is a disc with a certain thickness, and its side surfaces are, from front to back, a frustum (406) and a cylindrical surface (407); The center of the seeding disc (4) is provided with a seeding disc central axis hole (402); the center of the stirring wheel (2) is provided with a stirring wheel central axis hole (202); the seeding disc central axis hole (402) and the stirring wheel central axis hole (202) are both composed of a pair of mutually parallel planes and a pair of curved surfaces corresponding to the front structure of the shaft (7); the stirring wheel (2) and the seeding disc (4) are respectively fixed to the front of the shaft (7) through the stirring wheel central axis hole (202) and the seeding disc central axis hole (402); the screw (8) is screwed into the threaded hole (701) of the shaft (7) to axially lock the stirring wheel (2), the seeding disc (4), the first bearing (10), the second bearing (11) and the rear shell (6); The edge of the central axis hole (402) of the seeding disc extends backward to form a seeding disc axis hole boss (405), so that after assembly, the seeding disc axis hole boss (405) contacts the front end surface of the inner ring of the first bearing (10), axially positions the first bearing (10), and makes a certain distance between the rear surface of the seeding disc (4) and the front surface of the rear shell (6); a pair of positioning holes (401) for fixing the stirring wheel (2) are provided on the front surface of the seeding disc (4); four hole plug-in installation grooves (404) for accommodating the hole plug-in (3) are evenly provided along the circumference of the edge of the seeding disc (4); after assembly, the axis of the hole plug-in (3) is located on the extension line of the radius of the seeding disc (4); a pair of sliding grooves (403) parallel to the axis of the shaft (7) are provided on the left and right side walls of the hole plug-in installation groove (404); The shaped hole plug-in (3) is composed of a shaped hole portion (306) at the front and a semi-cylindrical portion (303) at the rear; a stirring ear (301) parallel to the axis of the shaped hole plug-in (3) and a shaped hole slot (302) for accommodating seeds are provided on the left side of the shaped hole portion (306); The hole groove (302) is formed by lofting and cutting the upper and lower sections, so that the hole groove (302) formed by the lofting and cutting has a horizontal bottom surface (302-1), a left side surface (302-2), a right side surface (302-3), a first inner side surface (302-4) and a second inner side surface (302-5); A pair of sliding bosses (305) corresponding to the sliding groove (403) of the hole plug-in installation groove (404) are provided on the left and right sides of the hole portion (306); the inner side surfaces of the hole portion (306) and the semi-cylindrical portion (303) are located in the same vertical plane; the outer side surface of the hole portion (306) is a first arc surface, and the outer side surface of the semi-cylindrical portion (303) is a second arc surface; the hole plug-in (3) can be freely slidably arranged in the hole plug-in installation groove (404) of the seeding disk (4) by cooperating with the sliding bosses (305) and the sliding groove (403) of the hole plug-in installation groove (404); When the shaped hole plug-in (3) is completely placed in the shaped hole plug-in installation groove (404) without axial movement, the first arc surface of the shaped hole portion (306) is coplanar with the truncated table surface (406) of the seeding disk (4), and the second arc surface of the semi-cylindrical portion (303) is coplanar with the cylindrical surface (407) of the seeding disk (4); the front end surface of the stirring ear (301) protrudes from the front surface of the seeding disk (4) and is coplanar with the front surface of the stirring wheel (2); the semi-cylindrical portion (303) is coplanar with the front surface of the stirring wheel (2); ) protrudes from the rear surface of the seeding disk (4); when the hole plug-in unit (3) rotates to the right side of the rear shell (6) along with the seeding disk (4), the semi-cylindrical surface of the semi-cylindrical portion (303) contacts the disturbance contact surface (503) of the disturbance step (5), and the disturbance step (5) pushes the hole plug-in unit (3) to slide axially in the hole plug-in unit mounting groove (404); a limiting boss (304) is provided on the second arc surface of the semi-cylindrical portion (303); The stirring wheel (2) is disc-shaped, and a positioning column (201) corresponding to the positioning hole (401) is provided on the rear surface of the stirring wheel (2); four stirring teeth (203) corresponding to the hole plug-in (3) are evenly provided along the circumference of the edge of the stirring wheel (2); the ends of the stirring teeth (203) are in contact with the inner side surface of the hole plug-in (3), and the stirring teeth (203) and the stirring ears (301) of the hole plug-in (3) are arranged in the same straight line; every two adjacent stirring teeth (203), the edge of the disc of the stirring wheel (2) and the edge of the seeding disc (4) form a seed filling area; The front shell (1) comprises an integrally formed plane shell plate (101), a frustum side shell plate (102), a cylindrical side shell plate (103), a seed filling pipe (104), a return pipe (105) and a seed dropping pipe (106); The plane shell plate (101), the frustum side shell plate (102) and the cylindrical side shell plate (103) are distributed in sequence from the center to the edge to form a front shell body; the outer surface of the cylindrical side shell plate (103) is evenly provided with four front shell hanging ears (108) in the circumferential direction, which are used to be bolted to the rear shell through hole (602) of the rear shell (6); after assembly, the edge of the cylindrical side shell plate (103) is located in the annular groove (604) of the rear shell (6); the outer surface of the cylindrical side shell plate (103) is provided with a limiting ring (109) in the circumferential direction, and the limiting ring (109) consists of a notch arc (109-1) and a limiting arc (109-2), and the limiting arc (109-2) can be connected with the type after assembly. The hole plug-in (3) contacts the limiting boss (304) for limiting the axial movement of the hole plug-in (3); the notch arc (109-1) corresponds to the position of the disturbance step (5), the beginning and the end of the notch arc (109-1) are respectively located at 80° and 120° counterclockwise, and a transition curve is provided between the end of the notch arc (109-1) and the limiting arc (109-2), so that the hole plug-in (3) loses the axial restriction of the limiting arc (109-2) when it contacts the disturbance step (5), thereby generating axial movement, and then the hole plug-in (3) is relocated in the hole plug-in installation groove (404) under the action of the transition curve and the limiting arc (109-2); The seed filling tube (104) is vertically arranged on the left side of the outer surface of the plane shell plate (101) near the vertical axis position of the front shell body (1), and the seed filling port (107) at the lower end of the seed filling tube (104) is connected to the lower part of the plane shell plate (101), and the seed filling port (107) corresponds to the seed filling area; The return pipe (105) is arranged obliquely on the left side of the outer surface of the plane shell plate (101), the left end of the return pipe (105) is connected to the left side of the frustum side shell plate (102), and the right end of the return pipe (105) is connected to the seed filling port (107) of the seed filling pipe (104); The seeding tube (106) is vertically arranged on the lower left side of the truncated cone side shell plate (102), and the seeding port (113) at the upper end of the seeding tube (106) is connected to the truncated cone side shell plate (102); the seeding port (113) is located at a position between 270° and 320° in the counterclockwise direction of the truncated cone side shell plate (102), and corresponds to the first arc surface of the molded hole portion (306) of the molded hole plug-in unit (3); The upper left portion of the frustum side shell plate (102), i.e., the portion of the front shell (1) at 160° to 270° counterclockwise from the lowest point of the front shell (1) at 0°, is provided with a seed clearing baffle (111) and a transition baffle (112) in sequence; wherein the transition baffle (112) is located at the portion at 250° to 270°; The seed cleaning baffle (111) and the transition baffle (112) are both composed of lofted curved surfaces. In the counterclockwise direction, the radius from the outer edge of the seed cleaning baffle (111) and the transition baffle (112) to the axis gradually increases, and the axial distance between the inner surface of the seed cleaning baffle (111) and the transition baffle (112) and the seeding disc (4) gradually increases, forming a seed cleaning trajectory that is a composite of a parabola and an ellipse from the head end of the seed cleaning baffle (111) to the left end of the return pipe (105). , so that when the shaped hole plug-in (3) rotates with the seeding disc (4) to the seed clearing baffle (111), the seeds not in the shaped hole groove (302) enter the return pipe (105) along the seed clearing trajectory under the action of centrifugal force, and then converge with the seeds in the seed filling tube (104) at the seed filling port (107) to enter the seed cavity, while the seeds in the shaped hole groove (302) leave the seeding device along with the shaped hole plug-in (3) through the seed dropping port (113) of the seed dropping tube (106), thereby achieving precision sowing.

2. The seed metering device according to claim 1, characterized in that: A gasket (9) is provided between the screw (8) and the stirring wheel (2).

3. The seed metering device according to claim 1, characterized in that: The radius ratio of the stirring wheel (2) to the seeding disc (4) is 1:1.6; the ratio of the length of the stirring teeth (203) to the radius of the stirring wheel (2) is 1:7.

5.

4. The seed metering device according to claim 1, characterized in that: The disturbance contact curved surface (503) is formed by lofting curved surfaces of an inner projection curve (503-1) and an outer projection curve (503-2); the inner projection curve (503-1) is formed by projecting a circular arc with a radius of 31 mm onto a cylindrical surface with a radius of 110 mm along the axis direction of the shaft (7); and the outer projection curve (503-2) is formed by projecting a circular arc with a radius of 37 mm onto a cylindrical surface with a radius of 120 mm along the axis direction of the shaft (7).

5. The seed metering device according to claim 1, characterized in that: The included angle between the generatrix of the truncated table (406) and the axis of the shaft (7) is 45°; the included angle between the generatrix of the remaining portion of the truncated table side shell (102) except the seed clearing baffle (111) and the transition baffle (112) and the axis of the shaft (7) is 45°.

6. The seed metering device according to claim 1, characterized in that: The inner surface of the plane shell plate (101) is provided with a central boss (110), and the outer diameter of the central boss (110) is equal to the radius of the stirring wheel (2).

7. The seed metering device according to claim 1, characterized in that: The distance between the axis of the seed filling tube (104) and the vertical axis of the front housing (1) is 30 mm.

8. The seed metering device according to claim 1, characterized in that: The angle between the axis of the return pipe (105) and the horizontal plane is 30°.

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