Maize mechanical-pneumatic combined plot breeding and seed-metering test device

Abstract

The invention discloses a corn mechanical-pneumatic combined plot breeding seed-metering test device which comprises a seed-metering device, a seed-metering roller rotation driving mechanism and a seed box baffle rotation driving mechanism, and the seed-metering device comprises a seed-metering roller, a roller cover, a fan, a seed-metering middle shaft, a seed box and a seed box baffle. A plurality of seed-metering hole groups distributed at equal intervals are formed in the outer side surface of the circumference of the seed-metering roller; the roller cover is positioned on and rotationally connected with the open side of the seed metering roller; an air suction through hole is formed in the roller cover; the fan is connected with the air suction through hole through a hose; the seed metering middle shaft penetrates through the roller cover, is rotationally connected with the roller cover and is fixedly connected with the seed metering roller; a rotating shaft of the rear caster is in transmission connection with the seeding middle shaft through a seeding roller rotation driving mechanism; one side of the seed box is mounted above the roller cover; the seed box baffle is rotationally connected with the seed metering middle shaft and is positioned below the seed box; and the seed box baffle rotation driving mechanism is in transmission connection with the seed box baffle. The working efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of corn sowing test, and more specifically to a corn mechanical-pneumatic combined plot breeding seeding test device. Background Art

[0002] Corn is one of the three major food crops, and its total planting area is second only to rice and wheat. Its position in food production is becoming increasingly important. Modern corn breeding experiments are the key factor in the success of breeding new varieties, so the research on mechanized corn breeding technology is becoming more and more important.

[0003] The plot breeding trial is conducted according to unified and standardized requirements to comprehensively identify the yield, adaptability, stress resistance and quality of newly bred varieties. According to the performance of the varieties in regional trials, combined with stress resistance identification and quality results, the varieties are comprehensively evaluated. This is the scientific basis for evaluating varieties and an important basis for the scientific layout of variety approval and promotion.

[0004] However, there are some problems with the current plot breeding test device. For example, Patent No. CN202310212421.X proposes a precision seeder suitable for corn breeding plot experiments. Multiple groups of storage boxes that can automatically control individual seeding can be used flexibly during sowing. The storage box can clean the seeds inside to avoid the seeds of the previous variety from being mixed in after the seed change. In addition, it can avoid blockage during sowing and improve sowing efficiency. However, the storage box needs to be disassembled for seed cleaning, and it cannot work continuously. Patent No. CN 202410252204.8 proposes a plot breeding air suction seeding device and a seeding method thereof, wherein a seeding tube is fixed at the right end of the front plate, and the seed bin is connected to the lower end of the seeding tube. The seed bin is wedge-shaped as a whole, with an opening at the rear end of the seed bin, and the rear end of the seed bin is in sliding contact with the front end of the seeding disk. The front side of the seed bin can be opened to allow excess seeds in the seed bin to be discharged, which effectively solves the problem of missed sowing of small amounts of experimental seeds that often occurs during plot breeding. Seed cleaning and seed replacement do not affect each other, which improves sowing accuracy, and the aisles between adjacent small fields are neat. However, the remaining seeds are not processed.

[0005] Therefore, providing an efficient corn mechanical-pneumatic combined plot breeding and seeding test device is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0006] In view of this, the present invention provides a corn mechanical-pneumatic combined plot breeding and seeding test device to at least solve one of the above-mentioned technical problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A corn mechanical-pneumatic combined plot breeding seeding test device comprises a frame and front and rear casters mounted on the frame, a seeding device, a seeding drum rotation drive mechanism and a seed box baffle rotation drive mechanism, the seeding device comprises a seeding drum, a drum cover, a fan, a seeding center shaft, a seed box and a seed box baffle, the outer circumferential side surface of the seeding drum has a plurality of seeding hole groups distributed at equal intervals; the drum cover is located on the open side of the seeding drum and is rotatably connected; the drum cover has an air intake hole, and the fan is connected to the seeding drum. The air suction through hole is connected by a hose; the drum cover is installed on the frame through a fixing plate; the seeding center axis passes through the drum cover and is rotatably connected thereto, and the seeding center axis is fixedly connected to the seeding drum; the rotating shaft of the rear caster is transmission-connected to the seeding center axis through the seeding drum rotation drive mechanism; one side of the seed box is installed on the upper side of the drum cover; the seed box baffle is rotationally connected to the seeding center axis and is located below the seed box; the seed box baffle rotation drive mechanism is transmission-connected to the seed box baffle.

[0009] By adopting the above technical solution, the beneficial effects of the present invention are:

[0010] It is possible to promptly remove the remaining seeds in the middle area between two plots without stopping the machine between plots, thereby achieving the removal of excess seeds without stopping the machine between plots, thereby improving the efficiency of the test work.

[0011] Furthermore, two partitions spaced apart along the circumferential direction are fixed between the drum cover and the opposite side of the seeding drum and the drum cover to divide the inner cavity of the seeding drum into a seed suction cavity and a seed delivery cavity; the drum cover is provided with an air inlet hole, and the air suction through hole is connected with the seed suction cavity, and the air inlet hole is connected with the seed delivery cavity.

[0012] Furthermore, the seed box baffle rotation drive mechanism includes an air pump, a cylinder, a rack and a gear, the air pump and the cylinder are both installed on the frame, and the air pump is connected to the cylinder body through an air pipe; the rack is fixed on the telescopic rod of the cylinder; the gear is rotationally connected to the seed discharge center axis, and the gear is meshingly connected to the rack, and the gear is fixedly connected to the seed box baffle.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that, under the drive of the cylinder, the rack moves horizontally, driving the gear to rotate, thereby driving the seed box baffle fixedly connected to it to rotate a certain angle, eliminating the obstruction to the seed box outlet, and achieving the leakage and cleaning of the remaining seeds in the seed box.

[0014] Furthermore, the seeding drum rotation drive mechanism includes a first sprocket, a second sprocket and a first chain, the first sprocket is sleeved and fixed on the seeding center shaft; the second sprocket is sleeved and fixed on the rotating shaft of the rear caster; the first sprocket and the second sprocket are connected through the first chain transmission.

[0015] The beneficial effect of adopting the above further technical solution is that the seeding drum can rotate as the rear casters move.

[0016] Furthermore, each of the seeding hole groups includes three seeding holes that are evenly spaced along the radial direction of the seeding drum.

[0017] The beneficial effect of adopting the above further technical solution is that three seeds can be sown in one seed hole.

[0018] Furthermore, the bottom of the seed box baffle is inclined at 45°.

[0019] The beneficial effect of adopting the above further technical solution is that the seed population has good fluidity, and the seeds will continue to move toward the outer circle due to their own gravity, which is conducive to seed filling.

[0020] Furthermore, the circumferential angle of the seeding cavity is 45°.

[0021] Furthermore, the corn mechanical-pneumatic combined plot breeding and seeding test device also includes a seed changing device, which includes a support shaft, a fixed cone disk, a movable cone disk, a third sprocket, a servo motor, a fourth sprocket and a second chain, the top end of the support shaft is fixedly connected to the frame; the fixed cone disk is located at the top of the seed box and is fixedly connected to the bottom end of the support shaft, and the fixed cone disk has a discharge hole corresponding to the position of the feed hole of the seed box; the movable cone disk is sleeved on the support shaft and rotatably connected thereto, and is located on the top of the fixed cone disk, and the movable cone disk has a plurality of feeding holes along its circumference, thereby forming a plurality of seed chambers between the plurality of feeding holes and the top wall of the fixed cone disk; the third sprocket is sleeved and fixed on the movable cone disk; the servo motor is mounted on the frame; the fourth sprocket is mounted on the output shaft of the servo motor; the third sprocket is connected to the fourth sprocket through the second chain transmission.

[0022] The beneficial effect of adopting the above-mentioned further technical solution is that multiple varieties can be stored in multiple seed rooms, without the need to manually add seeds of new varieties multiple times, thereby achieving timely replacement of varieties in the middle area between two plots.

[0023] Furthermore, the corn mechanical-pneumatic combined plot breeding and seeding experimental device also includes a surplus seed collection box, which is located directly below the seed box and fixedly connected to the rack.

[0024] The beneficial effect of adopting the above-mentioned further technical solution is that the remaining seeds can be collected in the middle area between the two plots without falling to the ground, and a gear rack mechanism is adopted with the seed box baffle to improve the synchronization of the seed cleaning process.

[0025] Furthermore, the frame includes a front beam of the frame, a rear beam of the frame and a height adjustment frame, the rear beam of the frame includes a cross beam and a longitudinal beam, one end of the cross beam is installed in the middle part of the rear of the front beam of the frame by a U-bolt, and the other end of the cross beam is installed with the rear caster through a rotating shaft; the top end of the support shaft is fixedly connected to the cross beam; the top end of the longitudinal beam is fixed on the cross beam, and a furrow opener is installed at the bottom end of the longitudinal beam; the seed discharge device, the seed changing device and the residual seed collection box are all located between the cross beam and the furrow opener; a cylinder support is provided at the bottom of the longitudinal beam near the furrow opener, and the cylinder is installed on the cylinder support; the top of the height adjustment frame is installed on the front beam of the frame by a U-bolt, and the front caster is installed at the bottom of the height adjustment frame; a motor support is provided on the rear side of the front beam of the frame, and the servo motor is installed on the motor support; the fan and the air pump are both installed on the front beam of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 The accompanying drawing is a schematic diagram of the overall structure of a corn mechanical-pneumatic combined plot breeding and seeding test device provided by the present invention;

[0028] Figure 2 The accompanying drawing is a schematic structural diagram of a seeding device provided by the present invention;

[0029] Figure 3 The accompanying drawing is a schematic structural diagram of the inner cavity of the seeding drum provided by the present invention;

[0030] Figure 4 The accompanying drawing is an exploded view of the seed replacement device provided by the present invention;

[0031] Figure 5 The accompanying drawing is a schematic structural diagram of a rack provided by the present invention;

[0032] Figure 6 The accompanying drawing is a structural schematic diagram of a corn mechanical-pneumatic combined plot breeding seeding test device in a sowing state provided by the present invention;

[0033] Figure 7 The accompanying drawing is a structural schematic diagram of a corn mechanical-pneumatic combined plot breeding seeding test device in a seed clearing state provided by the present invention;

[0034] Figure 8 The accompanying drawing is a structural schematic diagram of the seed-adsorbing state of the seed-discharging device provided by the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1-8 As shown, the embodiment of the present invention discloses a corn mechanical-pneumatic combined plot breeding seeding test device, comprising a frame 1, a front caster 2 and a rear caster 3 installed on the frame 1, a seeding device 4, a seeding drum rotation drive mechanism 5 and a seed box baffle rotation drive mechanism 6. The frame 1 is suspended on a tractor through a suspension frame 7, and the average forward speed of the tractor is 1 m / s. The seeding device 4 comprises a seeding drum 41, a drum cover 42, a fan 43, a seeding center shaft 44, a seed box 45 and a seed box baffle 46. The outer circumferential side surface of the seeding drum 41 has a plurality of equally spaced seeding hole groups 411; the drum cover 42 is located on the open side of the seeding drum 41 and is rotatably connected, that is, The drum cover 42 will not rotate with the seeding drum 41; the drum cover 42 has an air intake hole 421, and the fan 43 is connected to the air intake hole 421 through a hose 47; the drum cover 42 is installed on the frame 1 through a fixing plate 48; the seeding center shaft 44 passes through the drum cover 42 and is rotatably connected thereto, and the seeding center shaft 44 is fixedly connected to the seeding drum 41; the rotating shaft 31 of the rear caster 3 is connected to the seeding center shaft 44 through a seeding drum rotation drive mechanism 5; one side of the seed box 45 is installed on the upper side of the drum cover 42; the seed box baffle 46 is rotatably connected to the seeding center shaft 44 and is located below the seed box 45; the seed box baffle rotation drive mechanism 6 is connected to the seed box baffle 46. The present invention can timely remove the remaining seeds in the middle area between the two plots, and there is no need to stop the machine between the plots, so that the excess seeds can be removed without stopping the machine between the plots, thereby improving the efficiency of the test work.

[0037] Specifically, two partitions 49 are fixed between the drum cover 42 and the opposite side of the seeding drum 41 and the drum cover 42, which are spaced apart along the circumferential direction, so as to divide the inner cavity of the seeding drum 41 into a seed suction cavity 412 and a seed delivery cavity 413; the drum cover 42 is provided with an air inlet 422, and the air suction through hole 421 is connected with the seed suction cavity 412, and the air inlet 422 is connected with the seed delivery cavity 413.

[0038] Specifically, the seed box baffle rotation drive mechanism 6 includes an air pump 61, a cylinder 62, a rack 63 and a gear 64. The air pump 61 and the cylinder 62 are both installed on the frame 1, and the air pump 61 is connected to the cylinder 62 through an air pipe. In this embodiment, the air pipe adopts a polyurethane air duct, and the air pump 61 adopts a vortex air pump; the rack 63 is fixed on the telescopic rod of the cylinder 62; the gear 64 is rotationally connected to the seed row center axis 44, and the gear 64 is meshingly connected to the rack 63, and the gear 64 is fixedly connected to the seed box baffle 46. In this way, under the drive of the cylinder 62, the rack 63 moves horizontally, driving the gear 64 to rotate, thereby driving the seed box baffle 46 fixedly connected thereto to rotate a certain angle, losing the obstruction to the outlet of the seed box 45, and realizing the leakage and cleaning of the remaining seeds in the seed box 45.

[0039] Specifically, the seeding drum rotation drive mechanism 5 includes a first sprocket 51, a second sprocket 52 and a first chain 53. The first sprocket 51 is fitted and fixed on the seeding center shaft 44; the second sprocket 52 is fitted and fixed on the rotating shaft 31 of the rear caster 3; the first sprocket 51 and the second sprocket 52 are connected by the first chain 53, so that the seeding drum 41 rotates as the rear caster 3 moves.

[0040] Specifically, each seeding hole group 411 includes three seeding holes that are evenly spaced along the radial direction of the seeding drum 41, so as to sow three seeds in one seed hole.

[0041] Specifically, the bottom of the seed box baffle 46 is inclined at 45 degrees, so that the seed population has good fluidity, and the seeds will continue to move toward the outer circle due to their own gravity, which is conducive to filling the seeds.

[0042] Specifically, the circumferential angle of the seeding cavity 413 is 45°.

[0043] Specifically, a corn mechanical-pneumatic combined plot breeding seeding test device also includes a seed changing device 8, which includes a support shaft 81, a fixed cone disk 82, a movable cone disk 83, a third sprocket 84, a servo motor 85, a fourth sprocket 86 and a second chain 87. The top of the support shaft 81 is fixedly connected to the frame 1; the fixed cone disk 82 is located at the top of the seed box 45 and is fixedly connected to the bottom of the support shaft 81. The fixed cone disk 82 has a discharge hole 821 corresponding to the position of the feed hole of the seed box 45; the movable cone disk 83 is sleeved on the support shaft 81 and rotatably connected thereto, and is located at the top of the fixed cone disk 82. The movable cone disk 83 has a plurality of injection holes along its circumference. Feed hole 831, thereby forming multiple seed chambers between the multiple feeding holes 831 and the top wall of the fixed cone disk 82. In the present embodiment, there are 8 seed chambers, and the circumferential angle of each seed chamber area is 30°; the movable cone disk 83 rotates 45° every 4 seconds; the third sprocket 84 is fixed on the movable cone disk 83; the servo motor 85 is mounted on the frame 1; the fourth sprocket 86 is mounted on the output shaft of the servo motor 85; the third sprocket 84 and the fourth sprocket 86 are connected by the second chain 87, so that multiple varieties can be stored in multiple seed chambers, and there is no need to manually add seeds of new varieties multiple times, so that the varieties can be replaced in time in the middle area of ​​the two plots.

[0044] Specifically, a corn mechanical-pneumatic combined plot breeding and seeding experimental device also includes a residual seed collection box 9, which is located directly below the seed box 45 and is fixedly connected to the rack 63, so that the remaining seeds can be collected in the middle area between the two plots without falling to the ground, and a gear rack mechanism is adopted with the seed box baffle 46 to improve the synchronization of the seed cleaning process.

[0045] Specifically, the frame 1 includes a frame front beam 11, a frame rear beam 12 and a height adjustment frame 13, the frame rear beam 12 includes a cross beam 121 and a longitudinal beam 122, one end of the cross beam 121 is installed at the middle of the rear of the frame front beam 11 through a U-bolt 14, and the other end of the cross beam 121 is installed with a rear caster 3 through a rotating shaft 31; the top of the support shaft 81 is fixedly connected to the cross beam 121; the top of the longitudinal beam 122 is fixed on the cross beam 121, and the bottom of the longitudinal beam 122 is installed with a furrow opener 10; the seeding device 4, the seed changing device 8 and The remaining collection boxes 9 are all located between the cross beam 121 and the furrow opener 10; a cylinder support 1221 is provided at the bottom of the longitudinal beam 122 near the furrow opener 10, and the cylinder 62 is installed on the cylinder support 1221; the top of the height adjustment frame 13 is installed on the front beam 11 of the frame through the U-bolt 14, and the front caster 2 is installed at the bottom of the height adjustment frame 13; a motor support 111 is provided on the rear side of the front beam 11 of the frame, and the servo motor 85 is installed on the motor support 111; the fan 43 and the air pump 61 are both installed on the front beam of the frame.

[0046] The working principle of the present invention is as follows:

[0047] During sowing, the fan 43 and the air pump 61 are driven to work, the gas in the cylinder 62 is compressed, driving the telescopic rod to move, the remaining seed collecting device 9 leaves the sowing area of ​​the sowing device 4, and at the same time, the rack 63 translates to drive the gear 64 to rotate, so that the seed box baffle 46 rotates to the bottom of the seed box 45, closing the opening of the seed box 45; at the same time, the tractor moves forward to drive the rear caster 3 to rotate, and drives the seeding drum 41 to rotate through the first chain 53, the first sprocket 51 and the second sprocket 52, the air in the seed suction chamber 412 is compressed, and the seeds in the seed box 45 are adsorbed to the seeding hole 4111 by the adsorption force, and are transported to the sowing chamber 413 along the shaped hole (seeding hole 4111) on the rolling wall of the seeding drum 41. After the seeds are transported to the sowing chamber 413, since the sowing chamber 413 has an air inlet connected to the air 422, there is no pressure difference in the sowing chamber 413, so the seeds will lose the adsorption force and only fall down due to the action of gravity and the action of the cylinder wall.

[0048] After the sowing work of this plot is completed and the seed enters the middle area between the two plots, the fan 43 and the air pump 61 are turned off, and air enters the seed suction chamber 412. The atmospheric pressure in the seed suction chamber 412 is restored, and the seeds on the seeding roller 41 fall due to the loss of the pressure difference and the continuous rotation of the seeding roller 41; at the same time, there is no pressure difference in the cylinder 62, the telescopic rod is reset, the seed box baffle 46 leaves the bottom of the seed box 45, the seed box 45 is opened, and the remaining seeds fall due to their own gravity, while driving the remaining seed collecting device 9 to move to the bottom of the seeding area of ​​the seeding device 4 to collect the remaining seeds that fall; when the middle area between the two plots is about to leave, the servo motor 85 drives the moving disc 83 to rotate a certain angle through the second chain 87, the third sprocket 84 and the fourth sprocket 86, so that the seeds of the next variety in the next room enter the discharge hole 821; when all the excess seeds in the seeding device 4 are cleared out and the seeds of the next variety enter the seed box 45, the fan 43 and the air pump 61 are driven again to work and the operation is repeated.

[0049] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0050] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may 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 the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A corn mechanical-pneumatic combined plot breeding seeding test device, comprising a frame and front and rear casters mounted on the frame, characterized in that: The machine also includes a seeding device, a seeding drum rotation drive mechanism and a seed box baffle rotation drive mechanism, wherein the seeding device includes a seeding drum, a drum cover, a fan, a seeding center axis, a seed box and a seed box baffle, wherein the outer circumferential side surface of the seeding drum has a plurality of seeding hole groups distributed at equal intervals; the drum cover is located on the open side of the seeding drum and is rotatably connected; the drum cover is provided with an air suction hole, and the fan is connected to the air suction hole through a hose; the drum cover is mounted on the frame through a fixing plate; the seeding center axis passes through the drum cover and is rotatably connected thereto, and the seeding center axis is fixedly connected to the seeding drum; the rotating shaft of the rear caster is transmission-connected to the seeding center axis through the seeding drum rotation drive mechanism; one side of the seed box is mounted on the upper side of the drum cover; the seed box baffle is rotationally connected to the seeding center axis and is located below the seed box; the seed box baffle rotation drive mechanism is transmission-connected to the seed box baffle.

2. A corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 1, characterized in that: Two partitions spaced apart along the circumferential direction are fixed between the drum cover and the opposite side of the seeding drum and the drum cover to divide the inner cavity of the seeding drum into a seed suction cavity and a seed delivery cavity; the drum cover is provided with an air inlet hole, and the air suction through hole is connected with the seed suction cavity, and the air inlet hole is connected with the seed delivery cavity.

3. A corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 1 or 2, characterized in that: The seed box baffle rotation drive mechanism includes an air pump, a cylinder, a rack and a gear. The air pump and the cylinder are both installed on the frame, and the air pump is connected to the cylinder body through an air pipe; the rack is fixed on the telescopic rod of the cylinder; the gear is rotationally connected to the seed discharge center axis, and the gear is meshingly connected to the rack, and the gear is fixedly connected to the seed box baffle.

4. A corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 1, characterized in that: The seeding drum rotation driving mechanism includes a first sprocket, a second sprocket and a first chain. The first sprocket is sleeved and fixed on the seeding center shaft; the second sprocket is sleeved and fixed on the rotating shaft of the rear caster; the first sprocket and the second sprocket are connected through the first chain transmission.

5. The corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 1, characterized in that: The seeding hole groups each include three seeding holes that are evenly spaced along the radial direction of the seeding drum.

6. The corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 1, characterized in that: The bottom of the seed box baffle is inclined at 45°.

7. The corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 2, characterized in that: The circumferential angle of the seeding cavity is 45°.

8. The corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 3, characterized in that: The corn mechanical-pneumatic combined plot breeding and seeding test device also includes a seed changing device, which includes a support shaft, a fixed cone disk, a movable cone disk, a third sprocket, a servo motor, a fourth sprocket and a second chain, wherein the top end of the support shaft is fixedly connected to the frame; the fixed cone disk is located at the top of the seed box and is fixedly connected to the bottom end of the support shaft, and the fixed cone disk has a discharge hole corresponding to the position of the feed hole of the seed box; the movable cone disk is sleeved on the support shaft and rotatably connected thereto, and is located at the top of the fixed cone disk, and the movable cone disk has a plurality of feeding holes along its circumference, thereby forming a plurality of seed chambers between the plurality of feeding holes and the top wall of the fixed cone disk; the third sprocket is sleeved and fixed on the movable cone disk; the servo motor is mounted on the frame; the fourth sprocket is mounted on the output shaft of the servo motor; the third sprocket is connected to the fourth sprocket through the second chain transmission.

9. The corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 3, characterized in that: The corn mechanical-pneumatic combined plot breeding and seeding experimental device also includes a surplus seed collection box, which is located directly below the seed box and fixedly connected to the rack.

10. The corn mechanical-pneumatic combined plot breeding and seeding test device according to claim 8, characterized in that: The frame includes a front beam of the frame, a rear beam of the frame and a height adjustment frame, and the rear beam of the frame includes a cross beam and a longitudinal beam, one end of the cross beam is installed in the middle part of the rear of the front beam of the frame through a U-shaped bolt, and the other end of the cross beam is installed with the rear caster through a rotating shaft; the top end of the support shaft is fixedly connected to the cross beam; the top end of the longitudinal beam is fixed on the cross beam, and a furrow opener is installed at the bottom end of the longitudinal beam; the seed discharge device, the seed changing device and the residual seed collection box are all located between the cross beam and the furrow opener; a cylinder support is provided at the bottom of the longitudinal beam near the furrow opener, and the cylinder is installed on the cylinder support; the top of the height adjustment frame is installed on the front beam of the frame through a U-shaped bolt, and the front caster is installed at the bottom of the height adjustment frame; a motor support is provided on the rear side of the front beam of the frame, and the servo motor is installed on the motor support; the fan and the air pump are both installed on the front beam of the frame.

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