A single-seed high-precision seeder

Abstract

The present invention relates to the technical field of agricultural machinery operations, and specifically relates to a single-seed high-precision seeder. The high-precision seeder further includes a fertilizer applicator, a seed metering device, and a pressing device. The seed metering device includes a housing and a seed metering disc. A seed metering cavity communicating with the seed metering box is formed between the inside of the housing and one side of the seed metering disc. A negative pressure pipe is connected to the housing on the side of the seed metering disc away from the seed metering cavity. A number of seed metering suction holes are provided at the edge of the seed metering disc. A number of stripping bars for the seed metering suction holes are rotatably installed on the inner side of the housing. The seed metering device of the present invention can achieve single-seed high-precision falling into the grooves, making the distance between the seeds falling into the valley grooves average, making the growth of crops more average, and increasing the yield of crops. The walking wheels can rotate around the bottom of the frame through the connecting parts, so that when the seeder sows on uneven ground, the walking wheels always move along the ground, enabling the seeds to accurately fall into the grooves.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery operations, and particularly to a single-seed high-precision seeder. Background Art

[0002] Seeders for different crops generally consist of a frame, a traction or suspension device, a seed box, a seed metering device, a transmission device, a seed tube, a furrow opener, a furrow marker, running wheels, a soil covering and pressing device, etc. Among them, the main factors affecting seeding quality are the seed metering device and the furrow opener. The existing furrow opener and seed metering device are both fixed on the frame. When sowing on land with relatively low flatness, after the furrow opener opens a groove, the soil on the side of the groove may fall into the groove, making it impossible for the seeds to fall to a sufficient depth in the groove, reducing the survival rate of the seeds. Moreover, when moving on land with relatively low flatness, the distance between the seed metering device and the ground is uneven, making it impossible for the seeds to accurately fall into the groove, increasing cost waste and reducing yield. During the process of seed metering by the existing seed metering device, it is difficult to achieve single-seed metering per unit time, resulting in uneven distribution of nutrients for the seeds in a unit of farmland, making the growth of crops uneven and leading to a low yield of crops. Summary of the Invention

[0003] The purpose of the present invention is to provide a single-seed high-precision seeder to solve the problems raised in the above background art.

[0004] The technical solution of the present invention is as follows:

[0005] A single-seed high-precision seeder, the high-precision seeder includes a seed metering box, a frame, and a furrow opener arranged in sequence from top to bottom. The seed metering box is installed at the top of the frame, and the furrow opener is installed at the bottom of the frame;

[0006] The high-precision seeder further includes a fertilizer applicator, a seed metering device, and a pressing device arranged in sequence from front to back along the sowing direction. The seed metering device is installed on the frame. The fertilizer applicator is hinged to the front end of the frame in the sowing direction through a linkage mechanism, and the pressing device is hinged to the rear end of the frame in the sowing direction;

[0007] The seed metering device includes a housing and a seed metering disc rotatably installed vertically in the housing. A seed metering chamber communicating with the seed metering box is formed between the housing and one side of the seed metering disc. The housing is communicated with a negative pressure pipe on the side of the seed metering disc away from the seed metering chamber. A plurality of seed suction holes are arranged on the edge of the seed metering disc and are distributed in multiple circles along the circumferential direction of the seed metering disc. A plurality of stripping strip plates are rotatably installed on the inner side of the housing at the seed suction holes on the seed metering disc. A gas shut-off valve is arranged at the output port in the housing.

[0008] Preferably, a walking wheel is rotatably installed on the bottom end of the frame beside the furrow opener, and the walking wheel is rotatably connected to the frame through a connecting part, and a limited rectangular frame is rotatably installed on the bottom end of the frame directly above the walking wheel, and the limited rectangular frame is rotatably matched with the frame through a connecting shaft, and a limited handle is slidably matched along its own length direction in the limited rectangular frame, and the limit handle is located in the limit frame and is provided with a connecting spring, and a resistance rod that can interfere with the connecting part is provided at the end of the limit rectangular frame away from the limit handle, and the resistance rod is rotatably matched with the bottom end of the limit rectangular frame through a swing shaft, and the axis of the swing shaft is perpendicular to the axis of the connecting shaft, and a plurality of arc-shaped limiting holes are provided at the bottom end of the frame, and a limiting head that can be plug-matched with the limiting holes is provided on the limit handle.

[0009] Preferably, the connecting rod mechanism includes a hook and two elongated rotating arms, the two rotating arms are arranged at intervals in the vertical direction and their center lines are always parallel to each other, one end of the two rotating arms is hinged to the front end of the frame in the sowing direction through a hinge shaft, the hook is rotatably connected to the ends of the two rotating arms away from the frame through the rotating shaft, the axes of all hinge shafts and all rotating shafts are perpendicular to the sowing direction, a handle is hinged to the side of one end of the upper rotating arm close to the frame, the rotating arm is hinged to a U-shaped clamping portion beside the handle, the handle is provided with multi-stage clamping notches that are clamped and matched with the U-shaped clamping portion, and a number of buffer springs are installed between the bottom end of the handle and the end of the rotating arm at the bottom away from the U-shaped frame.

[0010] Preferably, the frame is rotatably mounted with a limit rod beside the hinge shaft at the bottom, and one end of a buffer spring connected to the handle is fixedly connected to the end of the limit rod.

[0011] Preferably, a driving sprocket is rotatably mounted on the hook, a connecting sprocket is rotatably mounted on the frame, a passive sprocket is mounted on the output shaft of the seed metering device, the driving sprocket is provided with an axial hole, and the driving sprocket, the connecting sprocket and the passive sprocket are matched through chain transmission.

[0012] Preferably, the output end of the seed meter is communicated with the seed box, the output end of the seed meter faces downward, and a seed metering port for avoiding the output end of the seed meter is provided at the bottom of the frame.

[0013] Preferably, the furrow opener includes two rear furrow opening discs distributed in an inverted eight shape, the planes where the two rear furrow opening discs are located are parallel to the sowing direction, a connecting portion extends downward from the bottom of the frame, and all the rear furrow opening discs are rotatably connected to the connecting portion.

[0014] Preferably, the fertilizer applicator includes a connecting frame and two front furrowing discs distributed in an inverted V shape. A clamping portion is provided at the top of the connecting frame, and the clamping portion is fixedly connected to a hook through a fixing pipe. All the front furrowing discs are distributed in an inverted V shape and are rotatably connected to the bottom of the connecting frame.

[0015] Preferably, the pressing device includes a covering housing rotatably connected to the bottom of the frame, two covering wheels distributed in an inverted V shape, and an adjusting mechanism.

[0016] Preferably, a seed storage box is installed at the rear side of the seed metering box on the top of the frame.

[0017] The present invention provides a single-seed high-precision seeder by making improvements. Compared with the prior art, it has the following improvements and advantages:

[0018] Firstly: The seed metering device of the present invention can achieve single-seed high-precision dropping into the grooves, making the distance between the seeds dropped into the grain grooves average, making the growth of crops more uniform, and increasing the yield of crops.

[0019] Secondly: The traveling wheels of the present invention can rotate around the bottom of the frame through the connecting portion. Through the abutting rod at the bottom of the rectangular limiting frame, when the seeder sows on uneven ground, the traveling wheels can always move along the ground, ensuring that the seed metering device is not affected by the uneven ground, so that the seeds can accurately fall into the grooves and will not fall outside the grooves.

[0020] Thirdly: After the fertilizer applicator in front of the seed metering device in the sowing direction opens the grooves, the furrow opener pushes the soil in the grooves to the side of the grooves again, ensuring that the seeds fall to a sufficient depth in the grooves and improving the survival rate of the seeds.

[0021] Fourthly: The connecting rod mechanism of the present invention can ensure that the seed metering device always fits and moves on the land with a relatively low flatness, ensuring that the distance between the seed metering device and the ground is basically the same, so that the seeds accurately fall into the grooves, reducing cost waste and increasing the yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further explained below with reference to the drawings and embodiments:

[0023] Figure 1 is a three-dimensional structural schematic diagram of the high-precision seeder of the present invention Figure 1 ;

[0024] Figure 2 is a three-dimensional structural schematic diagram of the high-precision seeder of the present invention Figure 2 ;

[0025] Figure 3 is a three-dimensional structural schematic diagram of the high-precision seeder of the present invention Figure 3 ;

[0026] Figure 4 is the three-dimensional structure schematic diagram of the high-precision seeder of the present invention Figure 4 ;

[0027] Figure 5 is the three-dimensional structure schematic diagram of the fertilizer applicator of the present invention Figure 1 ;

[0028] Figure 6 is the three-dimensional structure schematic diagram of the fertilizer applicator of the present invention Figure 2 ;

[0029] Figure 7 is the three-dimensional structure schematic diagram of the press device of the present invention Figure 1 ;

[0030] Figure 8 is the three-dimensional structure schematic diagram of the press device of the present invention Figure 2 ;

[0031] Figure 9 is the three-dimensional structure schematic diagram of the press device of the present invention Figure 3 ;

[0032] Figure 10 is the three-dimensional structure schematic diagram of the press device of the present invention Figure 4 ;

[0033] Figure 11 is the three-dimensional structure cross-section of the seed metering device of the present invention Figure 1 ;

[0034] Figure 12 is the three-dimensional structure cross-sectional view of the seed metering direction of the seed metering device of the present invention;

[0035] Figure 13 is the three-dimensional assembly schematic diagram of the furrow opener, frame and walking wheels of the present invention;

[0036] Figure 14 is the three-dimensional structure cross-section of the seed metering device of the present invention Figure 2 ;

[0037] Figure 15 is the three-dimensional structure schematic diagram of the seed metering device of the present invention Figure 1 ;

[0038] Figure 16 is the three-dimensional structure schematic diagram of the seed metering device of the present invention Figure 2 ;

[0039] Figure 17 is the three-dimensional assembly schematic diagram of the seed metering disc and the dropping bar plate of the present invention Figure 1 ;

[0040] Figure 18 is the three-dimensional assembly schematic diagram of the seed metering disc and the dropping bar plate of the present invention Figure 2 ;

[0041] Figure 19 is a three-dimensional structural assembly schematic diagram of the seed metering device housing and the outer stripping plate of the present invention;

[0042] Figure 20 is a side view of the pressing device of the present invention;

[0043] Figure 21 is Figure 20 a cross-sectional view along line A-A;

[0044] Figure 22 is a three-dimensional structural assembly schematic diagram of the seed metering device housing and the air shut-off valve of the present invention;

[0045] Description of reference numerals: fertilizer applicator 1, connecting frame 1a, clamping frame 1a1, articulated frame 1a2, connecting shaft 1a3, vertical sliding sleeve 1a4, guiding column 1a5, hinge head 1a6, connecting shaft 1a7, articulated seat 1a8, return spring 1a9, front furrowing disc 1b, clamping portion 1c, fixed pipe 1d, fertilizer guiding pipe 1e, clamping block 1f, arc-shaped guard plate 1h, baffle 1k, accommodating through hole 1m, guiding hole 1n, stripping bar plate 2, inner stripping bar plate 21, outer stripping bar plate 22, arc-shaped notch 221, sliding head 222, saw teeth 223, first rotating shaft 23, second rotating shaft 24, first limiting strip 25, first limiting block 26, second limiting strip 27, second limiting block 28, U-shaped block 29, negative pressure pipe 2a, connecting arm 2b, limiting rectangular frame 2c, limiting handle 2d, limiting hole 2e, resisting rod 2f, connecting spring 2g, limiting head 2h, seed metering plate 2k, seed guiding pipe 2m, frame 3, seed metering port 3a, connecting portion 3b, pressing device 4, covering housing 4a, avoiding strip hole 4a1, grading clamping joint 4a2, round hole 4a3, arc hole 4a4, positioning hole 4a5, scale hole 4a6, avoiding hole 4a7, connecting hole 4a8, mounting block 4a9, covering wheel 4b, adjusting mechanism 4c, pull rod 4c1, pulling spring 4c2, coupling shaft 4c3, rotating block 4c4, positioning stud 4c5, rotating rod 4c6, linkage mechanism 5, hook 5a, rotating arm 5b, articulated shaft 5c, handle 5d, multi-stage clamping notch 5d1, U-shaped clamping portion 5e, buffer spring 5f, rotating shaft 5h, limiting rod 5k, driving sprocket 5m, shaft hole 5m1, connecting sprocket 5n, driven sprocket 5z, seed metering device 6, seed metering disc 61, housing 62, rotating shaft 63, seed metering suction hole 64, furrow opener 7, rear furrowing disc 7a, walking wheel 8, seed metering box 9, seed storage box 91, covering tire 10, air shut-off valve 11, swinging shaft 12. Detailed implementation manners

[0046] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0047] The present invention provides a single-seed high-precision seeder through improvement. As Figures 1 - 22 shown, the high-precision seeder includes a seed metering box 9, a frame 3, and a furrow opener 7 arranged in sequence from top to bottom. The seed metering box 9 is installed at the top of the frame 3, and the furrow opener 7 is installed at the bottom of the frame 3;

[0048] The high-precision seeder further includes a fertilizer applicator 1, a seed metering device 6, and a pressing device 4 arranged in sequence from front to back along the sowing direction. The seed metering device 6 is installed on the frame 3. The fertilizer applicator 1 is hinged to the front end of the frame 3 in the sowing direction through a linkage mechanism 5, and the pressing device 4 is hinged to the rear end of the frame 3 in the sowing direction;

[0049] The seed metering device 6 includes a housing 62 and a seed metering disc 61 rotatably installed vertically in the housing 62. A seed metering chamber communicating with the seed metering box 9 is formed between the housing 62 and one side of the seed metering disc 61. The housing 62 is communicated with a negative pressure pipe 2a on the side of the seed metering disc 61 away from the seed metering chamber. A plurality of seed metering suction holes 64 are arranged on the edge of the seed metering disc 61 and are distributed in multiple circles along the circumferential direction of the seed metering disc 61. A plurality of stripping strips 2 are rotatably installed on the inner side of the housing 62 and are attached to the seed metering suction holes 64 on the seed metering disc 61. An airtight valve 11 is arranged at the output port in the housing. The airtight valve 11 is an airtight disc. The airtight valve 11 is installed on the back side of the seed metering disc 61 through a connecting plate. The airtight valve 11 is arranged on the back side of a plurality of seed metering suction holes at the output port of the housing and can block the seed metering suction holes, so that the negative pressure of the seed metering suction holes disappears, and thus the seeds fall.

[0050] The seed-dropping strip plate 2 is divided into an inner seed-dropping strip plate 21 capable of dropping the seeds on the seed-sucking holes in the inner circle of the seed-metering disc 61 and an outer seed-dropping strip plate 22 capable of dropping the seeds on the seed-sucking holes in the outer circle of the seed-metering disc 61. The inner seed-dropping strip plate 21 is rotationally connected to the housing through a first rotating shaft 23 perpendicular to the seed-metering disc 61. One end of the first rotating shaft 23 extends out of the housing and is provided with a first limiting strip 25. A plurality of first limiting blocks 26 capable of being clamped and matched with the first limiting strip 25 are arranged on the outer side of the housing beside the first limiting strip 25. The first limiting blocks 26 are distributed at equal angular differences around the first rotating shaft 23. The outer seed-dropping strip plate 22 is of an arc-shaped structure. One end of the outer seed-dropping strip plate 22 is rotationally installed in the housing through a swing shaft perpendicular to the plane where the seed-metering disc 61 is located. The other end of the outer seed-dropping strip plate 22 is provided with an arc-shaped notch 221 in the same direction as the radian direction of the outer seed-dropping strip plate 22. A second rotating shaft 24 is rotationally installed at one end of the housing close to the arc-shaped notch 221. Both the first rotating shaft 23 and the second rotating shaft 24 are parallel to the rotating shaft. One end of the second rotating shaft 24 close to the seed-metering disc 61 is provided with a U-shaped block 29. The U-shaped block 29 is provided with a sliding head 222 that is slidably matched with the arc-shaped notch 221. The other end of the second rotating shaft 24 away from the seed-metering disc 61 extends out of the housing and is provided with a second limiting strip 27. A plurality of second limiting blocks 28 capable of being clamped and matched with the second limiting strip 27 are arranged on the outer side of the housing beside the second limiting strip 27. The second limiting blocks 28 are distributed at equal angular differences around the second rotating shaft 24.

[0051] The seeds in the seed storage box fall into the seed discharge cavity of the shell, and the negative pressure pipe 2a is connected to a negative pressure device (not shown in the figure). When the seed discharge disc 61 rotates, the negative pressure device is started, and negative pressure is formed in the shell, so that the seeds are sucked on the seed discharge suction hole. The second limit card strip 27 and the first limit card strip 25 are both plastic parts and are flexible. The first limit card strip 25 and the second limit card strip 27 are pulled to leave the first limit card block 26 and the second limit card block 28 respectively, and the second rotating shaft 24 is rotated to adjust the distance between the inner side of the outer strip plate 22 and the outer seed discharge suction hole, and the seeds with a diameter larger than the required diameter are removed, or the outermost seeds are removed, and the first rotating shaft 23 is rotated to adjust the distance between the inner side of the inner strip plate 21 and the inner surrounding seed discharge hole. The distance between the suction holes is such that seeds with a diameter larger than the required diameter are removed, or the innermost seeds are removed. The inner stripping plate 21 and the outer stripping plate 22 are used separately to ensure that a single seed falls out of the seed metering device at any time. The output port of the shell is provided with a seeding plate 2k. The seeding plate 2k is an arc structure, and the arc direction of the seeding plate 2k extends from the inner seeding suction hole to the outer seeding suction hole. The inner arc edge of the outer stripping plate 22 is provided with saw teeth 223. An air-closing valve 11 is provided at the output port of the shell. When the seeding suction hole with seeds passes through the air-closing valve 11, the air-closing valve 11 closes the seeding suction hole, and the seeds fall out of the seed guide tube. The output port of the seed metering device is equipped with an arc-shaped seed guide tube 2m.

[0052] The high-precision seeder is generally fixed at the rear end of a tractor. The tractor pulls the high-precision seeder for sowing. First, the fertilizer applicator 1 opens a groove in the land along the sowing direction, the furrow opener 7 separates the soil in the groove, and at the same time the seed meter 6 discharges the seeds into the groove. Finally, the suppression device 4 fills the soil on both sides of the groove with the seeds in the groove.

[0053] A walking wheel 8 beside the furrow opener 7 is rotatably installed at the bottom end of the frame 3, and the walking wheel is rotatably connected to the frame 3 through a connecting arm 2b. The bottom end of the frame 3 is located directly above the walking wheel 8 and a limited rectangular frame 2c is rotatably installed. The limited rectangular frame 2c is rotatably matched with the frame 3 through a connecting shaft. A limited handle 2d is slidably matched along its own length direction in the limited rectangular frame 2c. The limit handle 2d is located in the limit frame and is provided with a connecting spring 2g. The end of the limit rectangular frame 2c away from the limit handle 2d is provided with a resistance rod 2f that can resist the connecting arm 2b. The resistance rod 2f is rotatably matched with the bottom end of the limit rectangular frame 2c through a swing shaft 12, and the axis of the swing shaft 12 is perpendicular to the axis of the connecting shaft. A plurality of arc-shaped limiting holes 2e are provided at the bottom end of the frame 3, and a limiting head 2h that can be plugged and matched with the limiting hole 2e is provided on the limit handle 2d.

[0054] The connecting rod mechanism 5 includes a hook 5a and two strip-shaped rotating arms 5b. The two rotating arms 5b are arranged at intervals along the vertical direction and their center lines are always parallel to each other. One end of the two rotating arms 5b is hinged to the front end of the frame 3 in the sowing direction through a hinge shaft 5c. The hook 5a is rotatably connected to one end of the two rotating arms 5b away from the frame 3 through a rotating shaft 5h. The axes of all hinge shafts 5c and the axes of all rotating shafts 5h are perpendicular to the sowing direction. A handle 5d is hinged to the side of the end of the upper rotating arm 5b close to the frame 3. A U-shaped clamping part 5e is hinged to the side of the rotating arm 5b where the handle 5d is located. The handle 5d is provided with a multi-stage clamping notch 5d1 that is clamped and matched with the U-shaped clamping part 5e. A plurality of buffer springs 5f are installed between the bottom end of the handle 5d and the end of the lower rotating arm 5b away from the U-shaped frame. Pull the handle 5d so that the clamping part 1c is clamped in the multi-stage clamping notch 5d1, so that the buffer springs 5f are stretched to different degrees, so that the force of the seed metering device 6 and the pressing device 4 against the ground is different, so that the drill can open grooves with the same depth on uneven ground.

[0055] A limiting rod 5k is rotatably installed on the side of the frame 3 beside the lower hinge shaft 5c. One end of one of the buffer springs 5f connected to the handle 5d is fixedly connected to the end of the limiting rod 5k. The limiting rod 5k can prevent the rotating arm 5b from rotating too much, so that the seed metering device 6 and the fertilizer applicator 1 collide, avoiding large fluctuations of the seed metering device 6 and relatively low seed metering accuracy.

[0056] A driving sprocket 5m is rotatably installed on the hook 5a. A connecting sprocket 5n is rotatably installed on the frame 3. A driven sprocket 5z is installed on the output shaft of the seed metering device 6. The driving sprocket 5m is provided with a shaft hole 5m1. The driving sprocket 5m, the connecting sprocket 5n and the driven sprocket 5z are in transmission cooperation through a chain. The driving sprocket 5m is driven to rotate by a tractor, so that the driven sprocket 5z drives the seed metering device 6 to rotate and discharge seeds into the grooves.

[0057] The seed metering device 6 includes a housing 62 and a seed metering disc 61 rotatably installed in the housing 62. The seed metering disc 61 is rotationally matched with the housing 62 through a rotating shaft 63. The axis of the rotating shaft 63 is parallel to the hinge shaft 5c. The plane where the seed metering disc 61 is located is perpendicular to the axis of the rotating shaft 63. A plurality of seed metering suction holes 64 distributed along the circumferential direction of the seed metering disc 61 are arranged at the edge of the seed metering disc 61. The driven sprocket 5z rotates to drive the rotating shaft 63 and the seed metering disc 61 to rotate. While the seed metering disc 61 rotates, the seeds in the seed metering suction holes 64 are driven to fall out from the outlet of the housing 62.

[0058] The output end of the seed metering device 6 communicates with the seed metering box 9. The output end of the seed metering device 6 faces downward. A seed metering opening 3a for avoiding the output end of the seed metering device 6 is provided at the bottom of the frame 3. The seeds falling out from the outlet of the housing 62 fall into the trench from the seed metering opening 3a.

[0059] The furrow opener 7 includes two rear furrow opening discs 7a distributed in an inverted V shape. The planes where the two rear furrow opening discs 7a are located are parallel to the sowing direction. A connecting portion 3b extends downward from the bottom of the frame 3. All the rear furrow opening discs 7a are rotatably connected to the connecting portion 3b. The two rear furrow opening discs 7a push aside the soil in the trench opened by the fertilizer applicator 1 to ensure that the seeds are discharged to a sufficient depth, avoiding the seeds not being properly placed and resulting in insufficient germination rate.

[0060] The fertilizer applicator 1 includes a connecting frame 1a and two front furrow opening discs 1b distributed in an inverted V shape. A clamping portion 1c is provided at the top of the connecting frame 1a. The clamping portion 1c is fixedly connected to the hook 5a through a fixing pipe 1d. All the front furrow opening discs 1b are distributed in an inverted V shape and are rotatably connected to the bottom of the connecting frame 1a. The front furrow opening discs 1b open a trench on the ground, and the fixing pipe 1d facilitates the loading and unloading of the fertilizer applicator 1 and the seed metering device 6.

[0061] The connecting frame 1a includes a clamping frame 1a1 and a hinged frame 1a2. The hinged frame 1a2 is rotatably connected to the bottom of the clamping frame 1a1 through a connecting shaft 1a3. All the front furrow opening discs 1b are distributed in an inverted V shape and are rotatably connected to the bottom of the hinged frame 1a2. The distance between all the front furrow opening discs 1b and the ground can be adjusted through the hinged frame 1a2.

[0062] A vertical sliding sleeve 1a4 is fixedly installed in the clamping frame 1a1. A guide post 1a5 slides vertically in the vertical sliding sleeve 1a4. The bottom end of the guide post 1a5 is hinged to the middle section of the hinged frame 1a2. A hinge seat 1a8 is provided at the bottom end of the guide post 1a5, and a hinge head 1a6 is provided at the middle section of the hinged frame 1a2. The hinge head 1a6 is hinged to the hinge seat 1a8 through an adapter shaft 1a7. A return spring 1a9 is sleeved between the bottom end of the vertical sliding sleeve 1a4 and the hinge seat 1a8 of the guide post 1a5. According to the hardness and flatness of the soil, the return spring 1a9 abuts against the front furrow opening discs 1b to open a trench in the soil, ensuring that the depth of the opened trench is the same.

[0063] A fertilizer guiding pipe 1e is installed between two front ditching discs 1b of the articulated frame 1a2. A clamping block 1f is arranged on the outer side of the fertilizer guiding pipe 1e. The articulated frame 1a2 is provided with a clamping groove that is clamped and matched with the clamping block 1f. An arc-shaped guard plate 1h is further arranged on the outer side of the fertilizer guiding pipe 1e. A plurality of baffle plates 1k are arranged between the arc-shaped guard plate 1h and the two front ditching discs 1b. The front ditching discs 1b ditch the soil, and the fertilizer guiding pipe 1e is communicated with a fertilizer box. The fertilizer in the fertilizer box falls into the ditched groove through the fertilizer guiding pipe 1e.

[0064] The included angle between the planes where the two front ditching discs 1b are located is between 10 degrees and 30 degrees. With such a setting, the ditching efficiency can be improved.

[0065] The bottom of the articulated frame 1a2 is a circular arc structure with an opening facing downwards. The bottom of the articulated frame 1a2 and the arc-shaped guard plate 1h are concentric, avoiding the two front ditching discs 1b from touching the articulated frame 1a2 while rotating.

[0066] The vertical sliding sleeve 1a4 is fixed on the clamping frame 1a1 by bolts. The clamping frame 1a1 is provided with a receiving through hole 1m for receiving the vertical sliding sleeve 1a4, which facilitates the taking and placing of the vertical sliding sleeve 1a4.

[0067] The guide post 1a5 is provided with a guide hole 1n for avoiding bolts along its own length direction, avoiding the bolts from hindering the sliding of the guide post 1a5.

[0068] The pressing device 4 includes a covering housing 4a rotatably connected to the bottom of the frame 3, two covering wheels 4b distributed in an inverted V shape, and an adjusting mechanism 4c. The adjusting mechanism 4c includes a pulling component for driving the covering housing 4a to rotate downward and an adjusting component for adjusting the height of the covering wheels 4b. The pulling component includes a pull rod 4c1 rotatably connected to the inner side of the covering housing 4a and a pulling spring 4c2. The bottom end of the pull rod 4c1 is rotatably connected to the covering housing 4a through a connecting shaft 4c3. The axis of the connecting shaft 4c3 is perpendicular to the sowing direction. One end of the pulling spring 4c2 is fixedly connected to the pull rod 4c1. One end of the pulling spring 4c2 is fixedly connected to a fixing seat (not shown in the figure), and the fixing seat is fixed on the frame 3. The bottom of the covering housing 4a is rotatably connected to a rotating block 4c4. The two covering wheels 4b are fixed on both sides of the rotating block 4c4. A rotating rod 4c6 is fixed on the rotating block 4c4. The bottom end of the rotating rod 4c6 is fixed on the rotating block 4c4. The outer rings of all the covering wheels are provided with covering tires 10 whose cross-section passing through their own axes is a triangular structure.

[0069] Pull the pull rod 4c1 away from the frame 3, and the pulling spring 4c2 is stretched. The restoring force of the pulling spring 4c2 causes the entire pressing device 4 to rotate downward, improving the covering force of the covering wheels 4b to cover the ditched groove with soil.

[0070] A through hole with a diameter larger than that of the coupling shaft 4c3 is provided at the bottom end of the pull rod 4c1. An avoidance strip hole 4a1 for avoiding the rotation of the pull rod 4c1 is provided at the top of the covering housing 4a. A plurality of grading card joints 4a2 for abutting against the pull rod 4c1 are arranged along the length direction of the avoidance strip hole 4a1. By pulling the pull rod 4c1 away from the frame 3 and abutting against different grading card joints 4a2, the pulling spring 4c2 is stretched, and the restoring force of the pulling spring 4c2 causes the entire pressing device 4 to rotate downward, adjusting the covering force of the covering wheel 4b to cover the soil in the trench.

[0071] The covering housing 4a is provided with a round hole 4a3 for avoiding the rotating block 4c4. An arc hole 4a4 is provided at the top of the round hole 4a3. The arc hole 4a4 and the round hole 4a3 are concentric. The bottom end of the rotating rod 4c6 is fixed to the rotating block 4c4 through a bolt passing through the arc hole 4a4. A plurality of positioning holes 4a5 are arranged on the side surface of the covering housing 4a at equal angular differences. A positioning stud 4c5 that can be inserted into the positioning hole 4a5 is threadedly installed on the pull rod 4c1. By removing the positioning stud 4c5 and pulling the rotating rod 4c6, since the two covering wheels 4b are inclined, the rotating block 4c4 rotates in the round hole 4a3, thereby adjusting the distance between the covering wheel 4b and the covering housing 4a.

[0072] An arc-shaped scale hole 4a6 is provided on the side surface of the covering housing 4a directly above the arc hole 4a4. An avoidance hole 4a7 for avoiding the rotation of the rotating rod 4c6 is provided at the middle position of the side surface of the covering housing 4a. The rotating rod 4c6 passes through the avoidance hole 4a7 and passes out from the scale hole 4a6. By pulling the rotating rod 4c6 and looking at the scale on the scale hole 4a6, the angle of rotation of the covering wheel 4b around the round hole 4a3 can be clearly known.

[0073] A connection hole 4a8 communicating the scale hole 4a6 and the avoidance hole 4a7 is provided on the side surface of the covering housing 4a. An installation block 4a9 for fixedly closing the connection hole 4a8 is provided on the side surface of the covering housing 4a. By removing the installation block 4a9, putting the rotating rod 4c6 into the avoidance hole 4a7, and then installing the installation block 4a9 on the covering housing 4a to close the connection hole 4a8, the rotating rod 4c6 can be prevented from rotating excessively and damaging the covering wheel 4b.

[0074] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-seed high-precision seeder, the high-precision seeder includes a seed metering box (9), a frame (3), and a furrow opener (7) arranged in sequence from top to bottom. The seed metering box (9) is installed at the top of the frame (3), and the furrow opener (7) is installed at the bottom of the frame (3), characterized in that: The high-precision seeder further includes a fertilizer applicator (1), a seed metering device (6), and a rolling device (4) arranged in sequence from front to back along the sowing direction. The seed metering device (6) is installed on the frame (3). The fertilizer applicator (1) is hinged to the front end of the frame (3) in the sowing direction through a linkage mechanism (5), and the rolling device (4) is hinged to the rear end of the frame (3) in the sowing direction; The seed metering device (6) includes a housing (62) and a seed metering disc (61) vertically and rotatably installed in the housing (62). A seed metering cavity communicating with the seed metering box (9) is formed between the housing (62) and one side of the seed metering disc (61). The housing (62) is connected to a negative pressure pipe (2a) on the side away from the seed metering cavity of the seed metering disc (61). A number of seed metering suction holes (64) are arranged on the edge of the seed metering disc (61) and are distributed in multiple circles along the circumferential direction of the seed metering disc (61). A number of stripping strip plates (2) fitting on the seed metering suction holes (64) of the seed metering disc (61) are rotatably installed on the inner side of the housing (62). An air shut-off valve (11) is arranged at the output port in the housing; The link mechanism (5) includes a hook (5a) and two strip-shaped rotating arms (5b). The two rotating arms (5b) are arranged at intervals along the vertical direction and their center lines are always parallel to each other. One end of the two rotating arms (5b) is hinged to the front end of the frame (3) in the sowing direction through a hinge shaft (5c). The hook (5a) is rotatably connected to one end of the two rotating arms (5b) away from the frame (3) through a rotating shaft (5h). The axes of all hinge shafts (5c) and the axes of all rotating shafts (5h) are perpendicular to the sowing direction. A handle (5d) is hinged to the side of one end of the upper rotating arm (5b) close to the frame (3). A U-shaped clamping part (5e) is hinged to the side of the rotating arm (5b) where the handle (5d) is located. The handle (5d) is provided with a multi-stage clamping notch (5d1) that is clamped and matched with the U-shaped clamping part (5e). A plurality of buffer springs (5f) are installed between the bottom end of the handle (5d) and one end of the lower rotating arm (5b) away from the U-shaped frame. A driving sprocket (5m) is rotatably installed on the hook (5a). A connecting sprocket (5n) is rotatably installed on the frame (3). A driven sprocket (5z) is installed on the output shaft of the seed metering device (6). The driving sprocket (5m) is provided with a shaft hole (5m1). The driving sprocket (5m), the connecting sprocket (5n) and the driven sprocket (5z) are in chain drive cooperation. A traveling wheel (8) is rotatably installed on the bottom end of the frame (3) beside the furrow opener (7). The traveling wheel is rotatably connected to the frame (3) through a connecting arm (2b). A limiting rectangular frame (2c) is rotatably installed on the bottom end of the frame (3) directly above the traveling wheel (8). The limiting rectangular frame (2c) is rotatably matched with the frame (3) through a connecting shaft. A limiting handle (2d) is slidably matched along the length direction of the limiting rectangular frame (2c). A connecting spring (2g) is arranged in the limiting frame where the limiting handle (2d) is located. A resisting rod (2f) that can resist the connecting arm (2b) is arranged at one end of the limiting rectangular frame (2c) away from the limiting handle (2d). A plurality of limiting holes (2e) distributed in an arc shape are arranged at the bottom end of the frame (3). A limiting head (2h) that can be inserted and matched with the limiting holes (2e) is arranged on the limiting handle (2d).

2. The single-seed high-precision seeder according to claim 1, wherein: A limiting rod (5k) is rotatably installed on the frame (3) beside the lower hinge shaft (5c). One end of one of the buffer springs (5f) connected to the handle (5d) is fixedly connected to the end of the limiting rod (5k).

3. The single-seed high-precision seeder according to claim 1, characterized in that: The output end of the seed metering device (6) is communicated with the seed metering box (9). The output end of the seed metering device (6) faces downward. A seed metering port (3a) for avoiding the output end of the seed metering device (6) is arranged at the bottom of the frame (3).

4. A single-seed high-precision seeder according to claim 1, characterized in that: The furrow opener (7) includes two rear furrow opening discs (7a) distributed in an inverted V shape. The planes where the two rear furrow opening discs (7a) are located are parallel to the sowing direction. A connecting part (3b) extends downward from the bottom of the frame (3). All the rear furrow opening discs (7a) are rotatably connected to the connecting part (3b).

5. The single-seed high-precision seeder according to claim 1, characterized in that: The fertilizer applicator (1) includes a connecting frame (1a) and two front furrowing discs (1b) distributed in an inverted V shape. A clamping portion (1c) is provided at the top of the connecting frame (1a). The clamping portion (1c) is fixedly connected to a hook (5a) through a fixing pipe (1d). All the front furrowing discs (1b) are distributed in an inverted V shape and are rotatably connected to the bottom of the connecting frame (1a).

6. The single-seed high-precision seeder according to claim 1, wherein: The pressing device (4) includes a covering housing (4a) rotatably connected to the bottom of the machine frame (3), two covering wheels (4b) distributed in an inverted V shape, and an adjusting mechanism (4c).

7. A single-seed high-precision seeder according to claim 1, characterized in that: A seed storage box (91) is installed at the rear side of the seed metering box (9) on the top of the machine frame (3).

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