CN218959462U - Unmanned aerial vehicle seed sowing machine - Google Patents

Abstract

The utility model discloses an unmanned aerial vehicle seed sowing machine, which belongs to the technical field of agricultural tools, and comprises a hopper and a sowing mechanism, wherein a feeding pipe is arranged on the sowing mechanism, the lower end of the hopper is arranged on the feeding pipe, a feeding channel communicated with the feeding pipe is arranged on the hopper, a discharging speed adjusting mechanism is arranged on the hopper, the discharging speed adjusting mechanism comprises a mounting groove penetrating through a cylindrical structure of the hopper, one end of the mounting groove is provided with a limiting plate, the feeding channel penetrates through the mounting groove, a sheave is rotationally connected with the mounting groove, the outer side surface of the sheave is distributed with a plurality of material grooves, an adjusting block capable of sliding along the material grooves is arranged in the material grooves, a knob is rotationally connected with the end part of the sheave, opposite to the limiting plate, of the sheave, a fixing ring is screwed outside the knob, and the adjusting block is fixed on the fixing ring; the hopper is also provided with a discharging motor for driving the grooved wheel to rotate. The utility model adopts the blanking motor with fixed rotating speed to drive the grooved wheel, and the blanking speed can be manually adjusted by the blanking speed adjusting mechanism.

Description

Unmanned aerial vehicle seed sowing machine

Technical Field

The utility model belongs to the technical field of agricultural tools, and particularly relates to an unmanned aerial vehicle seed sowing machine.

Background

Adopt agricultural dedicated unmanned aerial vehicle to sow is a very efficient seeding mode, generally installs the seeder on unmanned aerial vehicle and sow, and the seeder generally includes feed mechanism and sowing mechanism, and wherein, feed mechanism unloading is fast and slow can influence seeding efficiency, and can adopt the mode of motor drive feed tray to carry out the unloading on the unmanned aerial vehicle seeder at present, if the publication number is: CN112793785a, named as an utility model patent of a uniform blanking device of a seeding unmanned aerial vehicle, wherein the blanking device performs blanking by a mode of driving a blanking disc through a set motor, and the blanking speed depends on the rotation speed of the blanking disc driven by the motor, so that only a motor capable of adjusting the rotation speed and a special controller can be adopted. The motor with fixed rotation speed can not adjust the blanking speed.

Disclosure of Invention

The utility model aims at the defects and provides the unmanned aerial vehicle seed sowing machine, which adopts a discharging motor with fixed rotating speed to drive a grooved wheel, and the discharging speed can be manually adjusted by the arranged discharging speed adjusting mechanism.

The utility model aims at realizing the following technical scheme: the unmanned aerial vehicle seed sowing machine comprises a hopper and a sowing mechanism, wherein the sowing mechanism is provided with a feeding pipe, the lower end of the hopper is arranged on the feeding pipe, the hopper is provided with a feeding channel communicated with the feeding pipe, the hopper is provided with a discharging speed adjusting mechanism for adjusting the discharging speed of the hopper,

the blanking speed adjusting mechanism comprises an installation groove penetrating through a cylindrical structure of the hopper, a limit plate is fixedly arranged at one end of the installation groove, a feeding channel penetrates through the installation groove, a grooved wheel coaxially arranged with the installation groove is rotationally connected to the installation groove, the limit plate axially limits the grooved wheel, a plurality of grooves of strip-shaped structures distributed in a circumferential array around the central line of the grooved wheel are distributed on the outer side surface of the grooved wheel, the length direction of the grooves is parallel to the central line of the grooved wheel, the grooves are sealed towards the end part of the limit plate, the other end of the grooves is communicated with the end surface of the grooved wheel, an adjusting block capable of sliding along the grooves is arranged in the grooves, the outer wall of the adjusting block is a cambered surface with the radius equal to the radius of the grooved wheel, the central line of the cambered surface on the adjusting block coincides with the central line of the grooved wheel, a knob is rotationally connected to the central position of the end part of the grooved wheel back to the limit plate, a fixing ring is fixedly arranged on the fixing ring in a screwed manner outside the knob; the hopper is also detachably connected with a limit cover for axially limiting the knob, the grooved pulley and the knob are both positioned between the limit cover and the limit plate, and an elastic mechanism for keeping tension between the knob and the grooved pulley is arranged between the knob and the grooved pulley; and a discharging motor for driving the grooved wheel to rotate is further arranged on the hopper.

Preferably, the limiting plate is of a circular ring structure, the discharging motor is fixedly arranged on the outer side face of the hopper, a rotating shaft of the discharging motor penetrates through the limiting plate and is connected with the grooved wheel, the grooved wheel is sleeved on the rotating shaft of the discharging motor, and the grooved wheel can only slide along the length direction of the rotating shaft relative to the rotating shaft.

Preferably, the rotating shaft of the blanking motor penetrates through two ends of the blanking motor main body, and the end part of the rotating shaft, which is opposite to the grooved wheel, is fixedly connected with a holding block.

Preferably, the side of the knob facing the grooved pulley is provided with a mounting hole, the elastic mechanism comprises a friction block sleeved in the mounting hole in a sliding way, and a spring for pushing the friction block to be pressed on the grooved pulley is arranged in the mounting hole.

Preferably, the surface of the grooved pulley matched with the friction block is a rough surface.

Preferably, the guide ring with a circular ring structure is fixedly connected to the hopper, the fixed ring is of a circular ring structure, the fixed ring is sleeved in the guide ring, and the outer diameter of the fixed ring is equal to the inner diameter of the guide ring.

Preferably, the guide ring is vertically and fixedly provided with at least two fixing pins which are distributed in a circumferential array around the center line of the guide ring, the end part of the fixing pin, which is opposite to the guide ring, is fixedly provided with a limiting block, the limiting block is provided with at least two circular arc through grooves which are distributed in a circumferential array around the center line of the limiting cover, the circular arc through grooves are in one-to-one correspondence with the fixing pins, one end of each circular arc through groove is provided with a notch on the limiting cover, the notch is communicated with the edge of the limiting cover, the fixing pins can be embedded into the corresponding circular arc through grooves, and the thickness of the limiting cover is equal to the length of the fixing pins.

Preferably, the limit cover is provided with a through hole aligned with the knob.

Preferably, the sowing mechanism comprises a guide disc, a rotary disc, a driving motor for driving the rotary disc to turn around and a plurality of connecting rods, a containing cavity for containing the rotating disk is arranged in the guide disk, a gap is arranged at one side of the guide disk, the gap is communicated with the containing cavity, the feeding pipe is fixedly arranged on the upper end surface of the guiding disc and connected with the containing cavity, a plurality of material throwing discs for rotating and conveying seeds are uniformly arranged on the circumference of the rotating disc, the overlooking section of the material throwing discs is fan-shaped, the inner side and the two sides of the material throwing discs are upwards extended with baffle plates for limiting the seeds to be thrown out, t-shaped sliding blocks are arranged at the bottom of the material throwing disc, T-shaped sliding grooves matched with the T-shaped sliding blocks of the material throwing discs in size are uniformly formed in the circumference of the top surface of the rotating disc, the material throwing discs are arranged in a sliding mode with the rotating disc in a manner that the T-shaped sliding blocks are embedded into the T-shaped sliding grooves, the straight line of the T-shaped sliding grooves penetrates through the center point of the rotating disc to enable the material throwing discs to slide back and forth in the direction close to or far away from the center point of the rotating disc, a plurality of peripheral holes are uniformly formed in the circumference of the periphery of the center point of the rotating disc in a penetrating mode, one peripheral hole is correspondingly positioned on the straight line where one T-shaped sliding groove is positioned, the quantity of connecting rods is identical with the material throwing discs and is in one-to-one correspondence, one end of each connecting rod penetrates through the peripheral holes to be in rotary connection with the bottom of the material throwing disc, the other ends of the connecting rods are connected to an expanding and collecting rod in a free rotation mode through a universal joint, a linear groove is formed in a support of the seeder, a straight line where the linear groove is located is perpendicular to the disc surface of the guiding disc and penetrates through a disc center point of the rotating disc, the expanding and collecting rod is arranged in the linear groove to enable the expanding and collecting rod to move back and forth only in a direction close to or far away from the disc center point, and a fastening piece used for enabling the expanding and collecting rod and the support of the seeder to achieve mutual fastening action is further arranged in the linear groove.

Compared with the prior art, the utility model has the following beneficial effects:

1. the hopper provided by the utility model can be used by using the discharging motor with fixed rotation speed, and the usable volume of the groove wheel feeding groove can be adjusted by rotating the knob, so that the discharging speed of the hopper can be adjusted, and the operation is simple and convenient;

2. the seeding mechanism can change the distance between the throwing disc and the rotating center of the throwing disc, further adjust the distance of the radius from which seeds are thrown, and obtain different linear speeds through conversion of angular speed and radius to adjust the distance from which the seeds are thrown.

Drawings

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is a schematic view of the structure of the sowing mechanism after the guide disc is hidden;

FIG. 3 is a schematic view of the structure of the rotating disc and the throwing disc after a certain distance;

FIG. 4 is a schematic diagram of a mechanical kinematic pair of a throwing tray expansion mode;

FIG. 5 is a schematic view of the internal structure of the hopper;

FIG. 6 is a perspective view of a hopper;

FIG. 7 is an enlarged view of FIG. 6 at A;

FIG. 8 is a perspective view of the connection structure between the sheaves, knob, fixing ring, and adjustment block;

FIG. 9 is a cross-sectional view of the connection structure between the sheaves, knob, retaining ring, and adjustment block;

FIG. 10 is an enlarged view of FIG. 9B;

FIG. 11 is a perspective view of the limit cap;

the marks in the figure: 1. the device comprises a guide disc, 2, a rotating disc, 3, a driving motor, 4, a connecting rod, 5, a throwing disc, 6, a T-shaped sliding block, 7, a T-shaped sliding groove, 8, a circumferential hole, 9, an expanding and contracting rod, 11, a hopper, 12, a sowing mechanism, 13, a feeding pipe, 14, a feeding channel, 15, a mounting groove, 16, a limiting plate, 17, a grooved pulley, 18, a trough, 19, an adjusting block, 20, a knob, 21, a mounting hole, 22, a fixed ring, 23, a limiting cover, 24, a friction block, 25, a spring, 26, a blanking motor, 27, a holding block, 28, a guide ring, 29, a fixed pin, 30, a limiting block, 31, an arc through groove, 32 and a notch.

Detailed Description

The utility model is further described below with reference to embodiments shown in the drawings in which:

example 1

As shown in fig. 1-11, an unmanned aerial vehicle seed sowing machine comprises a hopper 11 and a sowing mechanism 12, wherein a feeding pipe 13 is arranged on the sowing mechanism 12, the lower end of the hopper 11 is installed on the feeding pipe 13, a feeding channel 14 which is communicated with the feeding pipe 13 is arranged on the hopper 11, a blanking speed adjusting mechanism which is used for adjusting the blanking speed of the hopper 11 is arranged on the hopper 11, the blanking speed adjusting mechanism comprises a mounting groove 15 which penetrates through a cylindrical structure of the hopper 11, a limit plate 16 which is fixedly arranged at one end of the mounting groove 15, the feeding channel 14 penetrates through the mounting groove 15, a groove wheel 17 which is coaxially arranged with the mounting groove 15 is rotationally connected in the mounting groove 15, the limit plate 16 axially limits the groove wheel 17, a plurality of strip-shaped groove grooves 18 which are distributed in a circumferential array mode around the center line of the groove wheel 17 are distributed on the outer side face of the groove wheel 17, the length direction of the groove 18 is parallel to the center line of the groove wheel 17, the groove 18 is closed towards the end of the limit plate 16, an adjusting block 19 which can only slide along the groove 18 is arranged in the groove 18, the outer wall of the adjusting block 19 is in a radius equal to the groove wheel 17, a knob 20 which is fixedly connected with the center line 20 on the end of the groove wheel 17, and the knob 20 is fixedly connected with the end surface of the knob 20 on the fixed side face of the groove wheel 17. The hopper 11 is also detachably connected with a limit cover 23 for limiting the axial direction of the knob 20, the grooved pulley 17 and the knob 20 are both positioned between the limit cover 23 and the limit plate 16, an elastic mechanism for keeping tension between the knob 20 and the grooved pulley 17 is arranged between the knob 20 and the grooved pulley 17, the elastic mechanism comprises a friction block 24 which is sleeved in a mounting hole 21 in a sliding manner, and a spring 25 which pushes the friction block 24 to be pressed on the grooved pulley 17 is arranged in the mounting hole 21. The surface of the grooved pulley 17 matched with the friction block 24 is a rough surface.

The hopper 11 is also provided with a discharging motor 26 for driving the grooved wheel 17 to rotate, the discharging motor 26 is fixedly arranged on the outer side face of the hopper 11, a rotating shaft of the discharging motor 26 penetrates through the limiting plate 16 and is connected with the grooved wheel 17, the grooved wheel 17 is sleeved on the rotating shaft of the discharging motor 26, and the grooved wheel 17 can only slide along the length direction of the rotating shaft relative to the rotating shaft. The rotating shaft of the blanking motor 26 penetrates through two ends of the main body of the blanking motor 26, and the end part of the rotating shaft, which is opposite to the grooved pulley 17, is fixedly connected with a holding block 27.

The hopper 11 is fixedly connected with a guide ring 28 with a circular ring structure, the fixed ring 22 is of a circular ring structure, the fixed ring 22 is sleeved in the guide ring 28, and the outer diameter of the fixed ring 22 is equal to the inner diameter of the guide ring 28. The guide ring 28 is vertically and fixedly provided with at least two fixing pins 29 which are distributed in a circumferential array around the center line of the guide ring 28, the end part of the fixing pins 29, which is opposite to the guide ring 28, is fixedly provided with a limiting block 30, the limiting cover 23 is provided with at least two circular arc through grooves 31 which are distributed in a circumferential array around the center line of the limiting cover 23, the circular arc through grooves 31 are in one-to-one correspondence with the fixing pins 29, one end of each circular arc through groove 31 on the limiting cover 23 is provided with a notch 32, the notch 32 is communicated with the edge of the limiting cover 23, the fixing pins 29 can be embedded into the corresponding circular arc through grooves 31, and the thickness of the limiting cover 23 is equal to the length of the corresponding fixing pins 29. The limit cover 23 is provided with a through hole aligned with the knob 20.

The seeding device of the unmanned aerial vehicle seed sowing machine comprises a guide disc 1, a rotating disc 2, a driving motor 3 for driving the rotating disc 2 to turn round and a plurality of connecting rods 4, wherein a containing cavity for containing the rotating disc 2 is arranged in the guide disc 1, one side of the guide disc 1 is provided with a notch which is communicated with the containing cavity, a feeding pipe 13 is fixedly arranged on the upper end surface of the guide disc and connected with the containing cavity, the feeding pipe 13 is positioned on one side of the guide disc 1 far away from the notch, a plurality of throwing discs 5 for rotating and conveying seeds are uniformly arranged on the circumference of the rotating disc 2, the overlooking section of each throwing disc 5 is fan-shaped, the inner side and the two sides of the throwing disc are upwards prolonged with baffles for limiting the throwing of the seeds, the bottom of each throwing disc 5 is provided with a T-shaped sliding block 6, the circumference of the top surface of the rotating disc 2 is uniformly provided with T-shaped sliding grooves 7 matched with the sizes of the T-shaped sliding blocks 6 of each throwing disc 5, the material throwing discs 5 are arranged in a sliding way with the rotating disc 2 in a way that T-shaped sliding blocks 6 are embedded into T-shaped sliding grooves 7, the straight line of the T-shaped sliding grooves 7 passes through the center point of the rotating disc 2 to enable each material throwing disc 5 to slide back and forth in the direction close to or far away from the center point of the rotating disc 2, a plurality of peripheral holes 8 are uniformly formed around the center point of the rotating disc 2 in a penetrating way, one peripheral hole 8 is correspondingly positioned on the straight line of the T-shaped sliding grooves 7, the connecting rods 4 and the material throwing discs 5 are the same in quantity and are in one-to-one correspondence, one end of each connecting rod 4 passes through the peripheral hole 8 and is connected with the bottom of the material throwing disc 5 in a rotating way, the other ends of the connecting rods 4 are all connected with a spreading and retracting rod 9 in a free rotating way through a universal joint, a straight line groove is formed in a bracket of the seeder, the straight line of the straight line groove is perpendicular to the disc surface of the guiding disc 1 and passes through the center point of the rotating disc 2, the expanding and contracting rod 9 is arranged in the linear groove so that the expanding and contracting rod can only move back and forth in the direction close to or far away from the center point of the disc, and a fastening piece for fastening the expanding and contracting rod 9 and the bracket of the seeder is also arranged in the linear groove.

The application principle of the utility model is as follows:

before the unmanned aerial vehicle seed sowing machine works, a user can rotate the knob 20 by passing through the through hole on the limit cover 23 by hand, and then the fixed ring 22 which is in threaded connection with the knob 20 can be driven to drive the adjusting block 19 to slide along the trough 18, so that the actual available volume of the trough 18 can be adjusted, and the blanking speed of the hopper 11 can be adjusted by changing the actual available volume of the trough 18 under the condition that the rotating speed of the rotating shaft of the blanking motor 26 is not changed. In order to avoid the sheave 17 rotating together when the knob 20 is rotated, the holding block 27 can be held by hand, so that the rotating shaft of the blanking motor 26 can be fixed, and the function of locking the sheave 17 is realized. When the interior of the grooved pulley 17 needs to be cleaned, the limiting cover 23 is rotated to enable the fixing pin 29 to be separated from the circular arc through groove 31 and enter the corresponding notch 32, the limiting cover can be detached at the moment, the grooved pulley 17 can be cleaned by pulling the knob 20 to drive the grooved pulley to be detached from the rotating shaft of the blanking motor 26, and only the reverse operation is needed for installing the grooved pulley 17.

During sowing, seeds enter the hopper 11 from the upper end of the hopper 11, the grooved pulley 17 is driven to rotate by the blanking motor 26, the seeds can continuously enter the trough 18 on the grooved pulley 17, and the seeds in the trough 18 can fall into the feeding pipe 13 from the lower part of the hopper 11 along with the rotation of the grooved pulley 17. The elastic mechanism arranged between the knob 20 and the grooved pulley 17 can keep tension between the knob 20 and the grooved pulley 17, namely, the friction block 24 is pressed on the grooved pulley 17 through the spring 25, so that relative rotation is not easy to occur between the knob 20 and the grooved pulley 17, the possibility of relative rotation between the knob 20 and the grooved pulley 17 can be reduced when the discharging motor 26 drives the grooved pulley 17 to rotate, the possibility of change of the actual available volume of the trough 18 in the rotating process of the grooved pulley 17 is reduced, and the running of the utility model is more stable. Seeds can fall into one of the material throwing discs 5 after entering the containing cavity in the guide disc 1 from the material inlet pipe, and at the moment, the material throwing disc 5 is positioned at the other side of the gap of the guide disc 1, so that the seeds can not be thrown out due to the fact that the circumferential wall of the guide disc 1 is blocked, then, the material throwing disc 5 can rotate to the gap of the guide disc 1 along with the rotation of the rotating disc 2, at the moment, the seeds can be thrown out by the baffle plates on the material throwing disc 5 to achieve a sowing effect, and due to the fact that the quantity of the seeds is large, the seeds are basically concentrated at the outermost edge of the material throwing disc 5 under the action of centrifugal force, the speed of throwing out the seeds can be approximately regarded as the product of the linear speed of the driving motor 3 and the distance between the outermost edge point of the material throwing disc 5 and the main shaft of the driving motor 3, so that in order to change the speed of throwing out the seeds, the distance between the outer end point of the material throwing disc 5 and the main shaft of the driving motor 3 is changed except the main shaft rotating speed of the driving motor 3.

As shown in fig. 4, it is not difficult to see that, as long as the expansion rod 9 is lifted, the outward movement of the material throwing disc 5 shown in the drawing is caused by the constraint relation of movement in all aspects, at this time, the distance from the outermost edge point of the material throwing disc 5 to the main shaft of the driving motor 3 is increased, after the conversion of the linear speed and the angular speed, the distance from the seed to be thrown out is correspondingly increased, and the lifting of the expansion rod 9 is opposite, so that, in order to ensure that each material throwing disc 5 synchronously expands outwards or contracts in a box, only one expansion rod 9 is adopted, and the expansion rod 9 is rotationally connected with each connecting rod 4 through a universal joint in a ball hinge connection mode, the lifting movement of the expansion rod 9 is skillfully converted into the synchronous expansion movement of the material throwing discs 5, and it is worth mentioning that the movement constraint of the material throwing disc 5 is provided by the T-shaped chute 7 and the T-shaped slide block 6, and the separation of the material throwing disc 5 from the rotating disc 2 can be effectively prevented by adopting the connection relation.

It should be understood that in the claims, the specification of the present utility model, all "including … …" should be interpreted as open-ended meaning that it is equivalent to "at least … …", and not as closed-ended meaning that it should not be interpreted to "include … …" only.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims (7)

1. The unmanned aerial vehicle seed sowing machine comprises a hopper and a sowing mechanism, wherein the sowing mechanism is provided with a feeding pipe, the lower end of the hopper is arranged on the feeding pipe, the unmanned aerial vehicle seed sowing machine is characterized in that the hopper is provided with a feeding channel communicated with the feeding pipe, the hopper is provided with a blanking speed adjusting mechanism for adjusting the blanking speed of the hopper,

the blanking speed adjusting mechanism comprises an installation groove penetrating through a cylindrical structure of the hopper, a limit plate is fixedly arranged at one end of the installation groove, a feeding channel penetrates through the installation groove, a grooved wheel coaxially arranged with the installation groove is rotationally connected to the installation groove, the limit plate axially limits the grooved wheel, a plurality of grooves of strip-shaped structures distributed in a circumferential array around the central line of the grooved wheel are distributed on the outer side surface of the grooved wheel, the length direction of the grooves is parallel to the central line of the grooved wheel, the grooves are sealed towards the end part of the limit plate, the other end of the grooves is communicated with the end surface of the grooved wheel, an adjusting block capable of sliding along the grooves is arranged in the grooves, the outer wall of the adjusting block is a cambered surface with the radius equal to the radius of the grooved wheel, the central line of the cambered surface on the adjusting block coincides with the central line of the grooved wheel, a knob is rotationally connected to the central position of the end part of the grooved wheel back to the limit plate, a fixing ring is fixedly arranged on the fixing ring in a screwed manner outside the knob; the hopper is also detachably connected with a limit cover for axially limiting the knob, and the grooved pulley and the knob are positioned between the limit cover and the limit plate; and a discharging motor for driving the grooved wheel to rotate is further arranged on the hopper.

2. The seed sowing machine of claim 1, wherein the limiting plate is of a circular ring structure, the discharging motor is fixedly arranged on the outer side face of the hopper, a rotating shaft of the discharging motor penetrates through the limiting plate and is connected with the grooved wheel, the grooved wheel is sleeved on the rotating shaft of the discharging motor, and the grooved wheel can only slide along the length direction of the rotating shaft relative to the rotating shaft.

3. The unmanned aerial vehicle seed sowing machine of claim 2, wherein the rotating shaft of the blanking motor penetrates through two ends of the blanking motor main body, and the end part of the rotating shaft, which is opposite to the grooved wheel, is fixedly connected with a holding block.

4. The seed sowing machine of claim 1, wherein the hopper is fixedly connected with a guide ring with a circular ring structure, the fixed ring is of a circular ring structure, the fixed ring is sleeved in the guide ring, and the outer diameter of the fixed ring is equal to the inner diameter of the guide ring.

5. The seed sowing machine of claim 4, wherein at least two fixing pins distributed in a circumferential array around a center line of the guide ring are vertically fixed on the guide ring, limiting blocks are fixedly arranged at the end parts of the fixing pins opposite to the guide ring, at least two circular arc through grooves distributed in a circumferential array around a center line of the limiting cover are arranged on the limiting cover, the circular arc through grooves are in one-to-one correspondence with the fixing pins, a notch is formed in one end of each circular arc through groove on the limiting cover, the notch is communicated with the edge of the limiting cover, the fixing pins can be embedded into the corresponding circular arc through grooves, and the thickness of the limiting cover is equal to the length of the fixing pins.

6. The seed planter of claim 1 wherein said limit cap is provided with a through hole aligned with a knob.

7. The unmanned seed sowing machine according to claim 1, wherein the sowing mechanism comprises a guide disc, a rotating disc, a driving motor for driving the rotating disc to turn around and a plurality of connecting rods, a containing cavity for containing the rotating disc is formed in the guide disc, a gap is formed in one side of the guide disc and communicated with the containing cavity, the feeding pipe is fixedly arranged on the upper end face of the guide disc and connected with the containing cavity, a plurality of throwing discs for rotating and conveying seeds are uniformly arranged on the circumference of the rotating disc, the overlooking cross section of each throwing disc is fan-shaped, baffles for limiting throwing out of the seeds extend upwards from the inner side and two sides of each throwing disc, T-shaped sliding grooves matched with the T-shaped sliding blocks of each throwing disc are uniformly formed in the circumference of the top surface of the rotating disc, the throwing discs are arranged in a sliding manner of the T-shaped sliding blocks embedded in the T-shaped sliding grooves, the straight line of the T-shaped chute passes through the center point of the rotary disk to enable each throwing tray to slide back and forth in the direction close to or far away from the center point of the rotary disk, a plurality of peripheral holes are uniformly formed around the center point of the rotary disk in a penetrating way, one peripheral hole is correspondingly positioned on the straight line of the T-shaped chute, the quantity of the connecting rods is the same as that of the throwing trays, one ends of the connecting rods pass through the peripheral holes and are in one-to-one correspondence connection with the bottoms of the throwing trays, the other ends of the connecting rods are all in free rotation connection with an expanding and contracting rod through a universal joint, a straight line groove is formed in a bracket of the seeder, the straight line of the straight line groove is perpendicular to the disk surface of the guiding tray and passes through the center point of the rotary disk, the expanding and contracting rod is arranged in the straight line groove to enable the expanding and contracting rod to move back and forth only in the direction close to or far away from the center point of the disk, the straight line slot is also provided with a fastener for fastening the expanding and contracting rod and the bracket of the seeder.

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