A self-pressurizing multi-row air force seed-metering device

Abstract

The present application relates to a kind of self-supply pressure device multi-row air force type seed metering device, including fan air duct assembly and the air chamber assembly connected with it.This application can realize one device multi-row air suction type precision seed metering, and seed metering unit itself provides the wind pressure required for suction seed, maximum utilization air chamber space;Self-supply pressure seed metering device avoids complex air pipe arrangement, reduces wind pressure loss, effectively improves the appearance and space utilization of machine tool;Seed metering device can carry out multi-row seed metering, reduces the cost of single grain precision air force seed metering;Fan is electrically driven, and air volume can be adjusted, and it is convenient for different crops to use seed metering.The other hand, on the basis of smooth seed disc, add seed supporting structure, increase seed population disturbance and seed following initial speed, improve the contact probability of seed and die hole, can guarantee the seeding accuracy while improving the seeding speed, more suitable for the development and application of high-speed seeding operation environment electric drive high-precision seeding technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural machinery technology, in particular to a self-supply pressure device multi-row pneumatic seed metering device. BACKGROUND

[0002] The pneumatic seed metering principle is widely used in advanced seeding machines at home and abroad due to its strong adaptability to seed shape and size, no damage to seeds, and easy realization of precision seeding. At present, most pneumatic seeding machines are equipped with high-power and large-volume air pumps, which are heavy in quality and low in space utilization. The air volume cannot be controlled during field operation, resulting in unstable air pressure, affecting the uniformity of seed metering and the consistency between rows.

[0003] At the same time, under the development trend of high-speed and high-performance seed metering, the increase of operation speed leads to the shortening of the filling time of the type hole, the low seed population dispersion, and the poor flowability, resulting in the decline of the operation performance of the whole machine. The seed disc structure is optimized and designed, the seed population dispersion is improved by increasing the seed supporting or disturbing structure, the seed population dispersion is improved, the seed population dispersion is improved, and the seed population dispersion is improved. SUMMARY

[0004] The present application provides a self-supply pressure, air volume adjustable, one device multi-row seed metering device, which solves the technical problems of power fluctuation affecting air pressure stability, the need for negative pressure in the seed metering process, the large loss and poor stability of the air flow after the bend supply pressure, the complex pipeline arrangement, the low space utilization rate, and the high cost of the existing precision seed metering device. On the other hand, the vertical disc pneumatic seed metering method is prone to missing seeds under high-speed operation conditions, and a seed disc structure suitable for high-speed and high-precision seed metering is provided.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] The application discloses a self-pressure-supply multi-row air force seed-metering device, which comprises a fan air duct assembly and a seed chamber assembly connected with the fan air duct assembly.

[0007] Further, the air chamber comprises an air chamber base, an air chamber outer cylinder installed on the air chamber base, V-shaped ribs connecting the air chamber outer cylinder and the air chamber base, fastening ears installed on the end surface of the air chamber, an air chamber bearing seat connected by a bearing seat support column in the air chamber cavity, the air chamber bearing seat is provided with a bearing positioning ring, two air chamber partition plates and a pressure isolation plate surround a positive pressure area in the air chamber cavity, the remaining area in the air chamber cavity is a negative pressure area, the upper air chamber partition plate and the air chamber base are horizontally arranged, the two air chamber partition plates are at a clockwise 45° angle, and the air chamber outer cylinder corresponding to the positive pressure area is provided with a plurality of pressure relief openings.

[0008] Further, the lower air chamber partition plate is provided with an arc-shaped notch, and the arc-shaped notch is matched with a gas outlet avoiding arc of the pressure isolation plate to form an annular through hole through which the gas outlet of the fan extends and is sealed in the positive pressure area, and the air inlet of the fan is in the negative pressure area cavity.

[0009] Further, different specifications of threaded holes are arranged on different pressure relief openings, so as to be matched with different specifications of pressure relief plugs, the number of the installed pressure relief plugs can be adjusted to adjust the air volume, and the air chamber wall thickness of the area where the pressure relief openings are located is greater than or equal to 12 mm.

[0010] Further, the seed chamber shell comprises a seed storage area and a seed filling area which are separated by a shell middle surface, the seed filling area structure is provided with a bolt for installing the seed tank cover and a vibration-proof surrounding strip for preventing the seed tank cover from being separated, the lower end of the shell middle surface is provided with a seed inlet on the side away from the seed separating plate, a seed discharge port is arranged directly below, and a sleeve mounting hole is arranged in the middle; the seed separating plate is provided with avoiding grooves for avoiding interference with the seed supporting plates on the seed-metering disc; and the seed chamber shell is provided with support ribs around.

[0011] Further, the pressure partition plate comprises a sealing insert, a positioning strip on one side of the sealing insert, an avoidance support rib for avoiding the fan, an air outlet avoidance arc, and a screw hole for locking with the air chamber; the sealing insert is matched with the sealing clamping groove distributed on the air chamber partition plate, the end surface of the pressure partition plate is leveled with the sunken ladder surface on the air chamber after assembly, the pressure partition plate is matched with the air chamber partition plate, and the air outlet of the fan is sealed in the air chamber.

[0012] Further, the fan and the pressure partition plate matched with the fan are arranged in the fan duct assembly, the bearing is arranged in the air chamber bearing seat, one end of the bearing is positioned through the bearing positioning ring, and the other end is clamped through the clamping spring, the seed arranging shaft penetrates the center of the bearing, and the seed arranging disc is fixedly connected with the flange, and then the expanding sleeve and the seed arranging shaft are connected without key.

[0013] Further, the air chamber bearing seat and the bearing seat support column are distributed on the outer side of the air outlet, so that the installation space of the fan in the air chamber cavity is reserved, and the distance between the end surface of the bearing seat on one side of the bearing and the matching surface of the air chamber sealing ladder is greater than 4 mm.

[0014] Further, after the fan duct assembly and the seed chamber assembly are bolted through the fastening ears on the air chamber and the corresponding fastening ears on the seed chamber shell, the end surface of the seed arranging disc is sunken by less than 0.5 mm compared with the end surface of the air chamber.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1. The present application is provided with two seed arranging discs, and one or more than one type hole is arranged according to the need to realize one device and multiple rows of air suction precision seed arranging, and has the advantages of good field distribution uniformity of single grain precision seed arranging and reduced cost and simple layout of multiple rows of parallel seed arranging, reduces the cost of air suction seed arranging, and simplifies the layout of the whole machine.

[0017] 2. The present application optimizes and improves the air suction seed arranging disc, and adds a seed supporting structure on the basis of the planar seed disc, the seed population disturbance and seed dragging force can be effectively increased through the shape and angle design of the seed supporting plate, the contact probability of the seed and the type hole is improved, the seeding speed is improved while the seeding precision is ensured, and the development and application of the electric drive high-precision seeding technology in the high-speed seeding operation environment are more suitable.

[0018] 3. The fan is arranged in the air chamber cavity of the present application, the seed arranging device can realize self-pressure supply, two seed arranging discs share the same air chamber and fan, the installation position of the built-in fan makes the seed arranging disc less affected by the suction force of the fan, and the seed arranging disc rotates smoothly.

[0019] 4、The self-supplying pressure device can supply positive and negative air pressure simultaneously, does not need external fan pipeline, can effectively reduce air pressure loss, improves space utilization and appearance of the machine; the internal fan is powered by electricity, connected with the controller through a connector, can adjust air pressure according to actual field operation, avoids the problem that the fan air pressure is easily affected by power fluctuation when the rear output shaft of the tractor or gasoline provides air pressure power, and the air pressure is stable;

[0020] 5、The whole structure of the seed sowing device is suitable for motor driving, can provide suitable mechanical structure for high-speed and high-precision seeding, and avoids the problem of performance degradation of seed sowing caused by traditional land wheel chain wheel driving;

[0021] 6、The seed sowing device structure is convenient to disassemble, can realize crop-combined seed sowing by replacing the seed sowing disc, and the size of the type hole on the seed sowing disc can be adjusted according to the shape and size of crops. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of the self-supplying pressure device multi-row seed sowing device of the application;

[0023] Figure 2 It is another direction structure schematic view of the self-supplying pressure device multi-row seed sowing device; Figure 1

[0024] Figure 3 It is an A-A direction sectional view of the self-supplying pressure device multi-row seed sowing device; Figure 2

[0025] Figure 4 It is a structure schematic view of the fan air duct combination of the self-supplying pressure device multi-row seed sowing device;

[0026] Figure 5 It is an installation schematic view of each component in the self-supplying pressure device multi-row seed sowing device; Figure 4

[0027] It is a structure schematic view of the seed chamber assembly of the self-supplying pressure device multi-row seed sowing device; Figure 6

[0028] It is a structure schematic view of the air chamber of the self-supplying pressure device multi-row seed sowing device Figure 7 Figure 1 It is a structure schematic view of the seed chamber shell of the self-supplying pressure device multi-row seed sowing device;

[0029] Figure 8 Figure 1 It is a structure schematic view of the seed sowing disc of the self-supplying pressure device multi-row seed sowing device;

[0030] Figure 9 It is an A-A schematic view of the self-supplying pressure device multi-row seed sowing device; Figure 1

[0031] It is a structure schematic view of the pressure separation plate of the self-supplying pressure device multi-row seed sowing device; Figure 10 Figure 9

[0032] Figure 11 Figure 1 ​​​​​​​​

[0033] Figure 12 For Figure 11 Another direction schematic diagram of the septum pressure plate.

[0034] The components represented by the numbers in the figure are listed as follows:

[0035] Fan air duct assembly 100, seed chamber assembly 200, air chamber 1, seed chamber shell 2, pressure relief air plug 3, seed drop tube 4, fan 5, seed unloading insert 6, sleeve 7, clasp spring 8, seed discharge shaft 9, seed box cover 10, seed discharge disc 11, flange 12, septum pressure plate 13, bearing 14, expansion sleeve 15;

[0036] Air chamber outer cylinder 1-1, air chamber cavity 1-2, sinking ladder surface 1-3, air chamber support 1-4, air chamber base 1-5, fan mounting hole 1-6, air chamber partition 1-7, sealing clamping groove 1-7-1, arc-shaped notch 1-7-2, locking buckle 1-7-3, pressure relief port 1-8, air chamber bearing seat 1-9, bearing positioning ring 1-10, bearing seat support column 1-11, negative pressure area 1-12, positive pressure area 1-13, air chamber end face 1-14, fastening ear 1-15;

[0037] Seed storage area 2-100, seed filling area 2-200, shell middle surface 2-300, bolt 2-1, seed inlet 2-2, fastening ear 2-3, seed unloading port 2-4, avoidance slot 2-5, seed separation plate 2-6, support rib 2-7, sleeve mounting hole 2-8, anti-vibration strip 2-9;

[0038] Air inlet 5-1, air outlet 5-2, wire harness 5-3;

[0039] Disc body 11-1, shaped hole 11-2, seed holding plate 11-3, flange fixing hole 11-4, flange avoidance hole 11-5;

[0040] Septum pressure plate body 13-1, avoidance support rib 13-2, air outlet avoidance arc 13-3, screw hole 13-4, positioning strip 13-5, sealing insert strip 13-6. DETAILED DESCRIPTION

[0041] The application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0042] As Figure 1 , 2 , 3 is a self-supply pressure air type seed metering device, which comprises an air chamber fan air duct assembly 100 and a seed chamber assembly 200. The air chamber fan air duct assembly 100 is connected to the symmetrical seed chamber assembly 200 on both sides through bolts to form the seed metering device body.

[0043] As Figure 4 , 5As shown, the air chamber fan duct assembly 100 includes an air chamber 1, a fan 5 embedded into the air chamber cavity, a pressure partition plate 13 fixedly connected with the air chamber partition plate 1-7 and matching the fan outlet, a pressure relief plug 3 installed on the air chamber circumferential surface, a bearing 14 installed on the air chamber bearing seat and the seed discharge shaft 9 assembled thereon, two seed discharge plates 11 installed on the end of the sunken ladder surface 1-3 on both sides of the air chamber and the flange 12 fixed thereon, and the expansion sleeve 15 tightly expanding the seed discharge shaft in the flange.

[0044] As shown in Figure 6 , the seed chamber assembly 200 includes a seed chamber shell 2 and a seed box cover 10 fixed above it, a seed discharge insert 6 below, a seed drop tube 4 on one side, and a sleeve 7 in the middle.

[0045] As shown in Figure 7 , the air chamber 1 includes an air chamber base 1-5, an air chamber outer cylinder 1-1 installed on the air chamber base 1-5, a V-shaped rib 1-4 connecting the air chamber outer cylinder 1-1 and the air chamber base 1-5, an air chamber bearing seat 1-9 connected by a bearing seat support column 1-11 embedded in the air chamber cavity 1-2, air chamber end faces 1-14 provided on both sides of the air chamber outer cylinder 1-1, and fastening ears 1-15 installed on the air chamber end faces 1-14. The air chamber base 1-5 is provided with bolt holes for mounting and fixing the seed discharge device to the frame, the air chamber bearing seat 1-9 is provided with a bearing positioning ring 1-10 at a specific position, the air chamber partition plate 1-7 cooperates with the pressure partition plate 13 and the fan outlet 5-2 to divide the air chamber cavity 1-2 into a negative pressure area 1-12 and a positive pressure area 1-13, the upper air chamber partition plate 1-7 is horizontally arranged with the air chamber base 1-5, and the upper and lower air chamber partition plates 1-7 are arranged at an angle of 45° clockwise, and the air chamber outer cylinder corresponding to the positive pressure area 1-13 is provided with pressure relief ports 1-8.

[0046] As shown in Figure 3 , 5 , the lower air chamber partition plate 1-7 is provided with an arc-shaped notch 1-7-2, and the air outlet avoiding arc 13-2 of the pressure partition plate 13 matches to form an annular through hole for the fan outlet 5-2 to pass through, the fan outlet 5-2 of the fan 5 extends into and is sealed in the positive pressure area 1-13 through the annular through hole, and the air inlet 5-1 of the fan 5 is in the negative pressure area 1-12 cavity.

[0047] As shown in Figure 8As shown in the figure, the seed chamber 2 includes a seed storage area 2-100 and a seed filling area 2-200 separated by the chamber middle surface 2-300, the seed filling area 2-200 is provided with a latch 2-1 for mounting the seed box cover 10 and a vibration-proof strip 2-9 for preventing the seed box cover 10 from being detached; the lower end of the chamber middle surface 2-300 is provided with a seed inlet 2-2 away from one side of the seed separating plate 2-6, a seed outlet 2-4 directly below, and a sleeve mounting hole 2-8 in the middle; the seed separating plate 2-6 is provided with a clearance notch 2-5 to avoid interference with the seed supporting plate 11-3 on the seed plate 11; the seed chamber 2 is provided with support ribs 2-7 around the periphery.

[0048] As shown in the figure, Figure 9 , 10 The seed plate 11 includes a plate body 11-1, and a plurality of type holes 11-2 are evenly distributed on the plate body 11-1, each type hole 11-2 is provided with a seed supporting plate 11-3 around the periphery, the seed supporting plate 11-3 is concentric with the type hole 11-2 to form a seed protecting posture, the seed protecting angle is 75°, the seed plate 11 is matched with the flange 12, the middle hub of the flange 12 is connected with the seed plate shaft 9 through the expansion sleeve 15 to realize power transmission. In the embodiment, the included angle between the line connecting the center of the type hole 11-2 and the center of the seed plate 11 and the line connecting the center of the corresponding seed supporting plate 11-3 and the center of the type hole 11-2 is α, the α values of all type holes 11-2 are the same, the distance between the edge of the seed supporting plate 11-3 and the type hole 11-2 is ≤1 average seed width, and the height of the seed supporting plate 11-3 is > the distance from the seed gravity center to the seed plate 11.

[0049] As shown in the figure, Figure 11 , 12 The pressure separating plate 13 includes a pressure separating plate body 13-1, one side of the pressure separating plate body 13-1 is provided with an air outlet avoiding arc 13-3, and the other side is provided with a screw hole 13-4 matched with the locking buckle 1-7-3 to fixedly connect the pressure separating plate 13 with the air chamber 1, and the pressure separating plate body 13-1 is provided with a positioning strip 13-5 and a sealing plug 13-6 at both ends.

[0050] In the embodiment, in order to ensure sufficient installation position and air tightness of the air plug, the thickness of the arrangement area of the pressure relief port 1-8 is ≥12 mm. In order to avoid easy seed jamming after error superposition, the end surface of the seed plate 11 is sunken by <0.5 mm compared with the air chamber end surface 1-14. The height of the seed inlet 2-2 should be greater than the height of the type hole 11-2 on the seed plate 11 at the corresponding position.

[0051] The working process of the device will be further described in combination with specific embodiments.

[0052] When the self-supply pressure multi-row pneumatic seed metering device is working, the fan control knob is opened, the fan impeller rotates at high speed, air is sucked in through the air inlet 5-1 and discharged through the air outlet 5-2, air is continuously supplemented into the air chamber cavity 1-2 from the type hole 11-2, so that the negative pressure area 1-12 is filled with negative pressure, the discharged air is discharged through the type hole 11-2 in the positive pressure area 1-13 and the pressure relief port 1-8, and the number of the installed pressure relief plugs 3 is used to adjust the positive pressure value of the type hole 11-2. Under the self-weight, population extrusion and certain flow capacity of the seed itself, the seed in the seed storage area 2-100 enters the seed filling area 2-200 through the seed inlet 2-2, is accumulated at the bottom of the seed filling area 2-200, and the seed layer height is higher than the bottom position of the uniformly distributed type hole 11-2 on the seed metering disc 11; one end of the seed metering shaft 9 is connected with the motor through the shaft coupling, and the motor drives the seed metering disc 11 to rotate when working, the type hole 11-2 at the bottom of the seed metering disc 11 is adsorbed from the seed layer under the action of the fan suction force and the seed metering disc dragging force, the seed filling process is completed, the adsorbed seed is separated from the seed population with the rotation of the seed metering disc 11, so that an ordered seed flow is formed, and the seed carrying process is started, when the type hole 11-2 is turned to the positive pressure area 1-13, the seed is separated from the type hole 11-2 under the action of its own gravity and the blowing force of the positive pressure, and falls into the seed dropping pipe 4 and is discharged to the field through the pipeline. After the operation is completed, the seed discharge plug 6 is pulled out, and the excess seed in the seed chamber shell 2 is discharged.

[0053] The self-supply pressure seed metering device is adopted, air pressure instability caused by the existing external fan centralized pressure is reduced, the self-supply pressure mode can effectively reduce the air pressure loss, and smaller type hole air pressure can complete seed adsorption; the seed metering device can carry out two-row seed metering, and the cost of single-grain precision pneumatic seed metering is reduced; the fan is driven by an electric motor, the air volume is adjustable, and the seed metering device is suitable for different crops; the motor driving can effectively avoid the uneven distribution in the field caused by the existing land wheel chain wheel driving, the motor speed is adjustable, the seed input amount can be adjusted according to the crop planting agricultural requirements; meanwhile, on the basis of the flat disc, a seed supporting structure is additionally arranged, seed population disturbance and seed following initial speed are increased, the contact probability of the seed and the type hole is improved, and the electric drive high-precision seed metering technology is more suitable for the development and application of high-speed seeding operation environment.

[0054] The wheat seed metering test further shows that the seed metering disc structure is more suitable for high-speed operation:

[0055] When the self-supply pressure multi-row precision seed metering device is used for wheat seeding, the hole diameter is 2.0 mm. When the seed metering device is working, the number of holes in which ≤2 seeds are adsorbed in 200 holes is recorded and obtained under different hole suction pressures and seed metering disc rotating speeds, and the average value is obtained by repeating 3 times each time. The results of ≤2 seed adsorption rate are as follows. It is found that the self-supply pressure seed metering mode can realize smaller suction pressure, effectively avoiding wind pressure loss; with the increase of the rotating speed of the seed metering disc, the centrifugal force of the seed increases, and the adsorption qualified rate shows a trend of first decreasing and then increasing; when the rotating speed of the seed metering disc is ≥40 r / min, the seed is blocked in the seed dragging process, the seed holding structure restrains the seed near the hole, and the adsorption qualified rate can be effectively improved, which is suitable for high-speed seeding operation.

[0056]

[0057] The above is an example of the best embodiment of the present application, wherein parts not described in detail are common knowledge of ordinary skilled in the art. The protection scope of the present application is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present application is also within the protection scope of the present application.

Claims

1. A self-supplying, multi-row pneumatic seeding device, characterized in that: The assembly includes a fan and duct assembly (100) and a seed chamber assembly (200) connected thereto. The fan and duct assembly (100) includes an air chamber (1), a fan (5) embedded in the air chamber cavity, a pressure plate (13) that snaps and seals with the air chamber partition and aligns with the fan outlet therein, a pressure relief plug (3) installed on the circumferential surface of the air chamber, a bearing (14) installed on the air chamber bearing seat, a seed metering shaft (9) assembled on the bearing (14), and a seed metering disc (11) installed in the air chamber. There are two seed metering discs (11) and they are respectively fixed at both ends of the seed metering shaft (9). The side of the seed metering disc (11) is evenly distributed with one or more rings of shaped holes (11-2). Each shaped hole (11-2) has one or more rings of shaped holes (11-2). 2) Each side is provided with an arc-shaped seed tray (11-3). The seed tray (11-3) is arc-shaped and has the same center as the corresponding hole (11-2). The angle between the line connecting the center of the hole (11-2) and the center of the seed tray (11) and the line connecting the center of the corresponding seed tray (11-3) and the center of the hole (11-2) is α. The α value is the same for all holes (11-2). The vertical distance between the seed tray (11-3) and the edge of the hole (11-2) is less than or equal to the average width of one seed. The seed chamber assembly (200) includes a seed chamber shell (2), a seed box cover (10) fixed on the seed chamber shell (2), a seed drop tube (4), a seed unloading insert (6), and a sleeve (7). Different pressure relief ports (1-8) are provided with threaded holes of different specifications for use with pressure relief plugs (3) of different specifications. The air volume can be adjusted by adjusting the number of pressure relief plugs (3) installed. The wall thickness of the air chamber in the area where the pressure relief port (1-8) is located is greater than or equal to 12mm. The air chamber (1) includes an air chamber base (1-5), an outer air chamber (1-1) installed on the air chamber base (1-5), a V-shaped rib (1-4) connecting the outer air chamber (1-1) and the air chamber base (1-5), a fastening ear (1-15) installed on the end face (1-14) of the air chamber, and a built-in air chamber cavity (1-2). The air chamber bearing seat (1-9) is connected by a bearing seat support column (1-11). The air chamber bearing seat (1-9) is provided with a bearing positioning ring (1-10). Two air chamber partitions (1-7) and a pressure plate (13) form a positive pressure zone (1-13) in the air chamber cavity (1-2). The remaining area in the air chamber cavity (1-2) is a negative pressure zone (1-12). The upper air chamber partition (1-7) and the air chamber base (1-5) are both arranged horizontally. The two air chamber partitions (1-7) are at a clockwise angle of 45°. Multiple pressure relief ports (1-8) are distributed on the outer cylinder of the air chamber corresponding to the positive pressure zone (1-13).

2. The self-powered multi-row pneumatic seeding device according to claim 1, characterized in that: An arc-shaped notch (1-7-2) is opened on the lower air chamber partition (1-7) below, which is matched with the air outlet clearance arc (13-2) of the pressure plate (13) to form an annular through hole through which the air outlet (5-2) of the fan (5) passes. The air outlet (5-2) of the fan (5) extends into the positive pressure zone (1-13) through the annular through hole and is sealed. The air inlet (5-1) of the fan (5) is in the cavity of the negative pressure zone (1-12).

3. The self-powered multi-row pneumatic seeding device according to claim 1, characterized in that: The seed chamber shell (2) includes a seed storage area (2-100) and a seed filling area (2-200) separated by the shell's middle surface (2-300). The seed filling area (2-200) has a pin (2-1) for installing the seed box cover (10) and a vibration damping strip (2-9) to prevent the seed box cover (10) from falling off. The lower end of the shell's middle surface (2-300) away from the seed partition plate (2-6) has a seed inlet (2-2), a seed unloading port (2-4) directly below it, and a sleeve mounting hole (2-8) in the middle. The seed partition plate (2-6) has clearance slots (2-5) to avoid interference with the seed tray (11-3) on the seed discharge tray (11). The seed chamber shell (2) has supporting ribs (2-7) distributed around its perimeter.

4. The self-powered multi-row pneumatic seeding device according to claim 2, characterized in that: The pressure plate (13) includes a sealing strip (13-5), a positioning strip (13-4) on one side of the sealing strip (13-5), a relief support rib (13-1) for avoiding the fan (5), an outlet relief arc (13-2), and a screw hole (13-3) for locking and fixing with the air chamber; the sealing strip (13-5) cooperates with the sealing groove (1-7-1) distributed on the air chamber partition (1-7), and after assembly, the end face of the pressure plate (13) is flush with the recessed trapezoidal surface (1-3) on the air chamber (1), the pressure plate (13) and the air chamber partition (1-7) are aligned, and the outlet (5-2) of the fan (5) is sealed therein.

5. The self-powered multi-row pneumatic seeding device according to claim 1, characterized in that: The fan and duct assembly (100) contains a fan (5) and a pressure plate (13) that cooperates with the fan. The bearing (14) is installed in the air chamber bearing seat (1-9). One end of the bearing is positioned by the bearing positioning ring (1-10), and the other end is clamped by the snap ring (8). The seed metering shaft (9) passes through the center of the bearing (14). After the seed metering disc (11) is fixedly connected to the flange (12), it is connected to the seed metering shaft (9) without keys by the expansion sleeve (15).

6. The self-powered multi-row pneumatic seeding device according to claim 2, characterized in that: The air chamber bearing housing (1-9) and bearing housing support column (1-11) are distributed on the outside of the air outlet (5-2) to retain the installation space of the fan in the air chamber cavity, while the distance between the bearing housing end face on one side of the bearing and the mating surface of the air chamber sealing step is greater than 4mm.

7. The self-powered multi-row pneumatic seeding device according to claim 1, characterized in that: After the fan duct assembly (100) and the seed chamber assembly (200) are connected by fastening lugs (1-15) on the air chamber (1) and fastening lugs on the corresponding seed chamber shell (2), the end face of the seed metering disc (11) is lowered by less than 0.5mm compared to the end face (1-14) of the air chamber.

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