CN210900325U - Corn plot seeding is with device of replanting - Google Patents

Abstract

The utility model relates to a seeding field especially relates to a maize district seeding is with device of reseeding, including removing frame, seeder, the seed case of reseeding, the transmission mechanism of reseeding and straining device, removal frame include body frame, preceding wheel carrier, motor power, charging source, back wheel carrier, mount pad, transmission support, handrail frame and seeding shaft, seeder include seeding dish, seed leaking hole, seeding drive wheel, seeding dish pivot and seeding transmission shaft, the seed case of reseeding include cylinder case, the little seed case in interval, seed case gear, layer board, fixed stay cover and seed leaking pipe, the transmission mechanism of reseeding including changing sprocket, back shaft, the gear of reseeding and the transmission shaft of reseeding, straining device include slide bracket, tensioning sprocket and extension spring, the utility model discloses can carry out automatic reseeding, improve seeding efficiency.

Description

Corn plot seeding is with device of replanting

Technical Field

The utility model relates to a seeding field especially relates to a maize district seeding is with device of replanting.

Background

The cultivation history of corn in China is about 470 years. But the yield is high, the quality is good, the adaptability is strong, and the cultivation area develops quickly. At present, the sowing area of China is about 3 hundred million mu, which is second to rice and wheat and is the third place in grain crops. In the experiment of some maize, generally need to plant multiple maize variety and compare, present seeding equipment mostly needs the manual work to trade kind when trading kind, influences seeding efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a maize district is sowed with device of replanting can carry out the automatic seed change, improves seeding efficiency.

The purpose of the utility model is realized through the following technical scheme:

a kind of corn plot seeding uses the seed changing device, including moving the shelf, seeding apparatus, seed changing seed box, seed changing drive mechanism and straining device, the said seeding apparatus rotates and connects to moving the shelf, the said seed changing seed box is fixedly connected to moving the shelf, seeding apparatus and seed changing seed box are connected slidably, the said seed changing drive mechanism is fixedly connected to moving the shelf, the seed changing drive mechanism is connected with seed changing seed box drive, the said straining device is connected to moving the shelf slidably, the straining device is connected with seed changing drive mechanism drive;

the movable frame comprises a main frame, a front wheel frame, a power motor, a charging power supply, a rear wheel frame, an installation seat, a transmission support, a handrail frame and a seed dropping pipe, wherein the front wheel frame is rotatably connected to the front end of the main frame, the rear wheel frame is rotatably connected to the rear end of the main frame, the power motor and the charging power supply are fixedly connected to the main frame, the power motor and the charging power supply are connected through a wire and a switch, the power motor is in transmission connection with the front wheel frame, the installation seat is fixedly connected to the left end of the rear wheel frame, the transmission support is fixedly connected to the left end of the main frame, the handrail frame is fixedly connected to the rear end of the main frame, and the seed dropping;

the seeding device comprises a seeding disc, seed leaking holes, a seeding driving wheel, a seeding disc rotating shaft and a seeding transmission shaft, wherein the seeding disc is uniformly provided with a plurality of seed leaking holes, the seeding disc is fixedly connected to the upper end of the seeding disc rotating shaft, the seeding disc rotating shaft is rotatably connected to the main frame, the seeding driving wheel is fixedly connected to the rear wheel carrier, the seeding transmission shaft is rotatably connected to the right end of the main frame, the seeding driving wheel is in transmission connection with the seeding transmission shaft, and the seeding disc rotating shaft is in transmission connection with the seeding transmission shaft;

the seed changing box comprises a cylindrical box, small spaced seed boxes, seed box gears, a supporting plate, a fixed supporting sleeve and seed leaking pipes, wherein a plurality of small spaced seed boxes are uniformly arranged in the circumferential direction in the cylindrical box;

the seed changing transmission mechanism comprises a seed changing chain wheel, a support shaft, a seed changing gear and a seed changing transmission shaft, the seed changing chain wheel is fixedly connected to the mounting seat through bolts, the support shaft is rotatably connected to the main frame, the seed changing gear is fixedly connected to the support shaft, the seed changing transmission shaft is rotatably connected to the transmission bracket, the seed changing chain wheel is in transmission connection with the seed changing transmission shaft, the support shaft is in transmission connection with the seed changing transmission shaft, and the seed changing gear is in meshing transmission connection with the seed box gear;

the tensioning mechanism comprises a sliding seat, a tensioning chain wheel and a tension spring, the tensioning chain wheel is rotatably connected to the sliding seat, the sliding seat is slidably connected to the transmission support, one end of the tension spring is fixedly connected with the transmission support, the other end of the tension spring is fixedly connected with the sliding seat, and the tensioning chain wheel is connected with the seed changing transmission shaft and the seed changing chain wheel through chain transmission.

The utility model has the advantages that: the utility model provides a seed changing device for corn plot seeding, which is driven by a power motor to move a front wheel carrier; the rear wheel frame rotates for a certain number of turns after moving for a certain distance, so that the transmission cylinder box rotates for a certain angle, and the plurality of small seed boxes at intervals are sequentially communicated with the seed leaking pipe, so that different seeds in the plurality of small seed boxes at intervals can fall into the seed leaking holes on the seed sowing tray through the seed leaking pipe in sequence for sowing and planting, and the aim of automatically replacing the sown seeds after the device moves for a certain distance is fulfilled; when the planting distance of every kind of seed need be changed, can be through changing the sprocket of changing, at drum case turned angle regularly, it is bigger to change the sprocket excircle, and the device displacement is littleer, otherwise, it is smaller to change the sprocket excircle, and the device displacement is bigger, and straining device is used for changing the sprocket and changes when changing the size, carries out the tensioning to the driving chain.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the overall structure of the present invention;

fig. 3 is a first schematic structural view of the moving frame of the present invention;

FIG. 4 is a schematic structural view of a second movable frame of the present invention;

FIG. 5 is a schematic structural view of the seeding device of the present invention;

FIG. 6 is a schematic view of the seed changing box structure of the present invention;

FIG. 7 is a schematic sectional view of the seed box of the present invention;

FIG. 8 is a schematic structural view of a seed changing transmission mechanism of the present invention;

fig. 9 is a schematic structural diagram of the tensioning mechanism of the present invention.

In the figure: a moving frame 1; a main frame 1-1; front wheel frames 1-2; 1-3 of a power motor; 1-4 of a charging power supply; 1-5 parts of a rear wheel frame; mounting seats 1-6; 1-7 of a transmission bracket; 1-8 parts of armrest frames; 1-9 parts of a seed dropping pipe; a seeding device 2; 2-1 of a seeding tray; 2-2 of a hole leakage; 2-3 of seeding driving wheels; a sowing disc rotating shaft 2-4; 2-5 of a seeding transmission shaft; a seed changing box 3; 3-1 of a cylindrical box; separating small seed boxes 3-2; 3-3 parts of a box gear; 3-4 of a supporting plate; 3-5 of a fixed support sleeve; 3-6 parts of a seed leakage pipe; a seed changing transmission mechanism 4; replacing the chain wheel 4-1; 4-2 of a support shaft; 4-3 of a seed changing gear; 4-4 of a seed changing transmission shaft; a tension mechanism 5; a sliding seat 5-1; a tension sprocket 5-2; and 5-3 of a tension spring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying fig. 1-9.

The first embodiment is as follows:

as shown in fig. 1-9, a seed changing device for seeding in a corn community comprises a movable frame 1, a seeding device 2, a seed changing box 3, a seed changing transmission mechanism 4 and a tensioning mechanism 5, wherein the seeding device 2 is rotatably connected to the movable frame 1, the seed changing box 3 is fixedly connected to the movable frame 1, the seeding device 2 is slidably connected to the seed changing box 3, the seed changing transmission mechanism 4 is fixedly connected to the movable frame 1, the seed changing transmission mechanism 4 is in transmission connection with the seed changing box 3, the tensioning mechanism 5 is slidably connected to the movable frame 1, and the tensioning mechanism 5 is in transmission connection with the seed changing transmission mechanism 4;

when in use, the power motor 1-3 drives the front wheel frame 1-2 to move the device; the device moves, the seeding disc 2-1 is driven by the rear wheel frame 1-5, the replacing chain wheel 4-1 is driven at the same time, the cylindrical box 3-1 is rotated by the replacing chain wheel 4-1, the rear wheel frame 1-5 rotates for a certain number of turns along with the movement of the device, so that the cylindrical box 3-1 is driven to rotate for a certain angle, the small seed boxes 3-2 at intervals are sequentially communicated with the seed leaking pipes 3-6, different seeds in the small seed boxes 3-2 at intervals sequentially fall into the seed leaking holes 2-2 on the seeding disc 2-1 through the seed leaking pipes 3-6 for seeding and planting, the purpose that the seeding seeds can be automatically replaced when the planting distance of each kind of seeds needs to be changed is achieved, the replacing chain wheel 4-1 can be replaced, when the rotation angle of the cylinder box 3-1 is fixed, the larger the excircle of the replacing chain wheel 4-1 is, the smaller the moving distance of the device is, and on the contrary, the smaller the excircle of the replacing chain wheel 4-1 is, the larger the moving distance of the device is, and the larger the replacing chain wheel 4-1 is, the larger the changing length of the tensioning mechanism 5 is, so that the transmission chain is tensioned.

The second embodiment is as follows:

as shown in figures 1-9, the movable frame 1 comprises a main frame 1-1, a front wheel frame 1-2, a power motor 1-3, a charging power supply 1-4, a rear wheel frame 1-5, an installation base 1-6, a transmission bracket 1-7, a handrail frame 1-8 and a seed dropping pipe 1-9, wherein the front wheel frame 1-2 is rotatably connected to the front end of the main frame 1-1, the rear wheel frame 1-5 is rotatably connected to the rear end of the main frame 1-1, the power motor 1-3 and the charging power supply 1-4 are both fixedly connected to the main frame 1-1, the power motor 1-3 and the charging power supply 1-4 are connected through a wire and a switch, the power motor 1-3 is in transmission connection with the front wheel frame 1-2, the installation base 1-6 is fixedly connected to the left end of the rear wheel frame 1-5, the transmission bracket 1-7 is fixedly connected with the left end of the main frame 1-1, the handrail frame 1-8 is fixedly connected with the rear end of the main frame 1-1, and the seed dropping pipe 1-9 is fixedly connected with the lower end of the main frame 1-1;

the device provides energy for a power motor 1-3 through a charging power supply 1-4, so that a front wheel frame 1-2 is driven to move the device, a rear wheel frame 1-5 is used for driving a seeding device 2, a mounting seat 1-6 is used for driving a seed changing transmission mechanism 4 through a rear wheel frame 1-5, a transmission support 1-7 is used for mounting the seed changing transmission mechanism 4 and a tensioning mechanism 5, a handrail frame 1-8 is used for controlling the device, and a seed dropping pipe 1-9 is used for enabling seeds carried by a seeding disc to smoothly drop into a seed pit so as to avoid the situation that the seed dropping distance is high and the seeding distance is changed by arbitrarily rolling the seeds after falling to the ground.

The third concrete implementation mode:

as shown in fig. 1-9, the sowing device 2 comprises a sowing plate 2-1, a plurality of seed leaking holes 2-2, a sowing driving wheel 2-3, a sowing plate rotating shaft 2-4 and a sowing transmission shaft 2-5, wherein the sowing plate 2-1 is uniformly provided with the plurality of seed leaking holes 2-2, the sowing plate 2-1 is fixedly connected with the upper end of the sowing plate rotating shaft 2-4, the sowing plate rotating shaft 2-4 is rotatably connected with a main frame 1-1, the sowing driving wheel 2-3 is fixedly connected with a rear wheel frame 1-5, the sowing transmission shaft 2-5 is rotatably connected with the right end of the main frame 1-1, the sowing driving wheel 2-3 is in transmission connection with the sowing transmission shaft 2-5, and the sowing plate rotating shaft 2-4 is in transmission connection with the sowing transmission shaft 2-;

the rear wheel frame 1-5 drives the seeding driving wheel 2-3 to rotate, the seeding driving wheel 2-3 drives the seeding transmission shaft 2-5 by a chain, the seeding transmission shaft 2-5 is meshed with and transmits the rotation shaft 2-4 of the seeding tray, the rotation shaft 2-4 of the seeding tray drives the seeding tray 2-1 to rotate, the plurality of seed leaking holes 2-2 rotate along with the seeding tray 2-1, when each seed leaking hole 2-2 passes through the seed leaking pipe 3-6 of the seed changing box 3, seeds in the small spacing seed box 3-2 fall into the seed leaking holes 2-2 through the seed leaking pipe 3-6 and rotate along with the seeding tray 2-1, and when the seed dropping pipe 1-9 is rotated, the seeds fall into seed pits along the seed dropping pipe 1-9.

The fourth concrete implementation mode:

as shown in fig. 1-9, the seed changing box 3 comprises a cylindrical box 3-1, a small interval box 3-2 and a box gear 3-3, the seed leakage device comprises a supporting plate 3-4, a fixed supporting sleeve 3-5 and a seed leakage pipe 3-6, wherein a plurality of small seed boxes 3-2 with intervals are uniformly arranged in the circumferential direction in a cylinder box 3-1, a seed box gear 3-3 is fixedly connected to the outer end of the cylinder box 3-1, the supporting plate 3-4 is fixedly connected to the upper end of the fixed supporting sleeve 3-5, the cylinder box 3-1 is rotatably connected with the fixed supporting sleeve 3-5 and is attached to the supporting plate 3-4, the seed leakage pipe 3-6 is fixedly connected to the lower end of the supporting plate 3-4, the fixed supporting sleeve 3-5 is fixedly connected to a main frame 1-1, and the lower end of the seed leakage pipe 3-6 is in sliding connection with a seeding plate 2-1;

the seed changing transmission mechanism 4 transmits the seed box gear 3-3, so that the seed box gear 3-3 drives the cylinder box 3-1 to slowly rotate on the fixed support sleeve 3-5, the small separated seed boxes 3-2 in the cylinder box 3-1 sequentially pass through the seed leaking pipes 3-6 on the supporting plate 3-4, when the small separated seed boxes 3-2 slowly rotate above the seed leaking pipes 3-6, the seeds in the seed box fall into the seed discharge hole 2-2 through the seed discharge pipe 3-6, when the small seed box 3-2 at the interval passes through the seed discharge pipe 3-6, the next adjacent small seed box 3-2 at the interval carries different seeds to be communicated with the seed leaking pipe 3-6, and then the seeds in the small seed box 3-2 at the interval are sown, so that the automatic seed changing and sowing can be realized after the device moves for a certain distance.

The fifth concrete implementation mode:

as shown in fig. 1-9, the seed changing transmission mechanism 4 comprises a seed changing chain wheel 4-1, a support shaft 4-2, a seed changing gear 4-3 and a seed changing transmission shaft 4-4, the seed changing chain wheel 4-1 is fixedly connected to a mounting seat 1-6 through a bolt, the support shaft 4-2 is rotatably connected to a main frame 1-1, the seed changing gear 4-3 is fixedly connected to the support shaft 4-2, the seed changing transmission shaft 4-4 is rotatably connected to a transmission bracket 1-7, the seed changing chain wheel 4-1 is in transmission connection with the seed changing transmission shaft 4-4, the support shaft 4-2 is in transmission connection with the seed changing transmission shaft 4-4, and the seed changing gear 4-3 is in meshing transmission connection with a seed box gear 3-3;

the replacing chain wheel 4-1 rotates through the mounting seat 1-6 and then the wheel carrier 1-5, the seed changing transmission shaft 4-4 is transmitted through a chain, the seed changing transmission shaft 4-4 transmits the supporting shaft 4-2, the supporting shaft 4-2 transmits the seed box gear 3-3 through the seed changing gear 4-3 in a meshing manner, the rotation of the cylindrical box 3-1 is realized, when the planting distance of each kind of seeds needs to be changed, the replacing chain wheel 4-1 can be replaced, when the rotating angle of the cylindrical box 3-1 is fixed, namely the angle corresponding to a small seed box 3-2 is separated, the larger the excircle of the replacing chain wheel 4-1 is, the fewer the rotating circles of the replacing chain wheel 4-1 are needed, namely the fewer the rotating circles of the rear wheel carrier 1-5 are needed, so that the moving distance of the device is smaller, on the contrary, the smaller the excircle of the replacing chain wheel 4-1 is, the more the rotating turns of the replacing chain wheel 4-1 are, namely the more the rotating turns of the rear wheel frame 1-5 are, and the larger the moving distance of the device is.

The sixth specific implementation mode:

as shown in fig. 1-9, the tensioning mechanism 5 comprises a sliding seat 5-1, a tensioning sprocket 5-2 and a tension spring 5-3, the tensioning sprocket 5-2 is rotatably connected to the sliding seat 5-1, the sliding seat 5-1 is slidably connected to a transmission bracket 1-7, one end of the tension spring 5-3 is fixedly connected to the transmission bracket 1-7, the other end of the tension spring 5-3 is fixedly connected to the sliding seat 5-1, and the tensioning sprocket 5-2 is connected to a seed changing transmission shaft 4-4 and a replacing sprocket 4-1 through chain transmission.

When the planting distance of each kind of seeds is changed, the replacing chain wheel 4-1 needs to be replaced, the replaced replacing chain wheel 4-1 is different from the excircle of the original replacing chain wheel 4-1, the length of the transmission chain is unchanged, the tightness of the transmission chain is adjusted by changing the position of the tensioning chain wheel 5-2, the tension of the tension spring 5-3 pulls the sliding seat 5-1 to move towards the rear end of the device on the transmission support 1-7, so that the transmission chain is always in a tensioning state, and transmission is not influenced.

The utility model relates to a maize district seeding is with device of replanting, its theory of use is: when in use, the power motor 1-3 drives the front wheel frame 1-2 to move the device; the device moves, the seeding disc 2-1 is driven by the rear wheel frame 1-5, the replacing chain wheel 4-1 is driven at the same time, the cylindrical box 3-1 is rotated by the replacing chain wheel 4-1, the rear wheel frame 1-5 rotates for a certain number of turns along with the movement of the device, so that the cylindrical box 3-1 is driven to rotate for a certain angle, the small seed boxes 3-2 at intervals are sequentially communicated with the seed leaking pipes 3-6, different seeds in the small seed boxes 3-2 at intervals sequentially fall into the seed leaking holes 2-2 on the seeding disc 2-1 through the seed leaking pipes 3-6 for seeding and planting, the purpose that the seeding seeds can be automatically replaced when the planting distance of each kind of seeds needs to be changed is achieved, the replacing chain wheel 4-1 can be replaced, when the rotation angle of the cylinder box 3-1 is fixed, the larger the excircle of the replacing chain wheel 4-1 is, the smaller the moving distance of the device is, and on the contrary, the smaller the excircle of the replacing chain wheel 4-1 is, the larger the moving distance of the device is, and the larger the replacing chain wheel 4-1 is, the larger the changing length of the tensioning mechanism 5 is, so that the transmission chain is tensioned. The device provides energy for a power motor 1-3 through a charging power supply 1-4, so that a front wheel frame 1-2 is driven to move the device, a rear wheel frame 1-5 is used for driving a seeding device 2, a mounting seat 1-6 is used for driving a seed changing transmission mechanism 4 through a rear wheel frame 1-5, a transmission support 1-7 is used for mounting the seed changing transmission mechanism 4 and a tensioning mechanism 5, a handrail frame 1-8 is used for controlling the device, and a seed dropping pipe 1-9 is used for enabling seeds carried by a seeding disc to smoothly drop into a seed pit so as to avoid the situation that the seed dropping distance is high and the seeding distance is changed by arbitrarily rolling the seeds after falling to the ground. The rear wheel frame 1-5 drives the seeding driving wheel 2-3 to rotate, the seeding driving wheel 2-3 drives the seeding transmission shaft 2-5 by a chain, the seeding transmission shaft 2-5 is meshed with and transmits the rotation shaft 2-4 of the seeding tray, the rotation shaft 2-4 of the seeding tray drives the seeding tray 2-1 to rotate, the plurality of seed leaking holes 2-2 rotate along with the seeding tray 2-1, when each seed leaking hole 2-2 passes through the seed leaking pipe 3-6 of the seed changing box 3, seeds in the small spacing seed box 3-2 fall into the seed leaking holes 2-2 through the seed leaking pipe 3-6 and rotate along with the seeding tray 2-1, and when the seed dropping pipe 1-9 is rotated, the seeds fall into seed pits along the seed dropping pipe 1-9. The seed changing transmission mechanism 4 transmits the seed box gear 3-3, so that the seed box gear 3-3 drives the cylinder box 3-1 to slowly rotate on the fixed support sleeve 3-5, the small separated seed boxes 3-2 in the cylinder box 3-1 sequentially pass through the seed leaking pipes 3-6 on the supporting plate 3-4, when the small separated seed boxes 3-2 slowly rotate above the seed leaking pipes 3-6, the seeds in the seed box fall into the seed discharge hole 2-2 through the seed discharge pipe 3-6, when the small seed box 3-2 at the interval passes through the seed discharge pipe 3-6, the next adjacent small seed box 3-2 at the interval carries different seeds to be communicated with the seed leaking pipe 3-6, and then the seeds in the small seed box 3-2 at the interval are sown, so that the automatic seed changing and sowing can be realized after the device moves for a certain distance. The replacing chain wheel 4-1 rotates through the mounting seat 1-6 and then the wheel carrier 1-5, the seed changing transmission shaft 4-4 is transmitted through a chain, the seed changing transmission shaft 4-4 transmits the supporting shaft 4-2, the supporting shaft 4-2 transmits the seed box gear 3-3 through the seed changing gear 4-3 in a meshing manner, the rotation of the cylindrical box 3-1 is realized, when the planting distance of each kind of seeds needs to be changed, the replacing chain wheel 4-1 can be replaced, when the rotating angle of the cylindrical box 3-1 is fixed, namely the angle corresponding to a small seed box 3-2 is separated, the larger the excircle of the replacing chain wheel 4-1 is, the fewer the rotating circles of the replacing chain wheel 4-1 are needed, namely the fewer the rotating circles of the rear wheel carrier 1-5 are needed, so that the moving distance of the device is smaller, on the contrary, the smaller the excircle of the replacing chain wheel 4-1 is, the more the rotating turns of the replacing chain wheel 4-1 are, namely the more the rotating turns of the rear wheel frame 1-5 are, and the larger the moving distance of the device is. When the planting distance of each kind of seeds is changed, the replacing chain wheel 4-1 needs to be replaced, the replaced replacing chain wheel 4-1 is different from the excircle of the original replacing chain wheel 4-1, the length of the transmission chain is unchanged, the tightness of the transmission chain is adjusted by changing the position of the tensioning chain wheel 5-2, the tension of the tension spring 5-3 pulls the sliding seat 5-1 to move towards the rear end of the device on the transmission support 1-7, so that the transmission chain is always in a tensioning state, and transmission is not influenced.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention also belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a maize district seeding is with device of reseeding, is including removing frame (1), seeder (2), seed case (3), drive mechanism (4) and straining device (5) of reseeding, its characterized in that: seeder (2) rotate to be connected on removing frame (1), seed changing case (3) fixed connection on removing frame (1), seeder (2) and seed changing case (3) sliding connection, seed changing drive mechanism (4) fixed connection on removing frame (1), seed changing drive mechanism (4) and seed changing case (3) transmission are connected, straining device (5) sliding connection on removing frame (1), straining device (5) and seed changing drive mechanism (4) transmission are connected.

2. The seed changing device for seeding in corn district as claimed in claim 1, characterized in that: the movable frame (1) comprises a main frame (1-1), a front wheel frame (1-2), a power motor (1-3), a charging power supply (1-4), a rear wheel frame (1-5), a mounting seat (1-6), a transmission support (1-7), a handrail frame (1-8) and a seed dropping pipe (1-9), wherein the front wheel frame (1-2) is rotatably connected to the front end of the main frame (1-1), the rear wheel frame (1-5) is rotatably connected to the rear end of the main frame (1-1), the power motor (1-3) and the charging power supply (1-4) are fixedly connected to the main frame (1-1), the power motor (1-3) and the charging power supply (1-4) are connected through a wire and a switch, the power motor (1-3) is in transmission connection with the front wheel frame (1-2), the mounting seat (1-6) is fixedly connected with the left end of the rear wheel frame (1-5), the transmission bracket (1-7) is fixedly connected with the left end of the main frame (1-1), the armrest frame (1-8) is fixedly connected with the rear end of the main frame (1-1), and the seed dropping pipe (1-9) is fixedly connected with the lower end of the main frame (1-1).

3. The seed changing device for seeding in corn district as claimed in claim 2, characterized in that: the seeding device (2) comprises a seeding disc (2-1), a seed discharge hole (2-2), a seeding driving wheel (2-3), a seeding disc rotating shaft (2-4) and a seeding transmission shaft (2-5), a plurality of seed leaking holes (2-2) are uniformly arranged on the seeding disc (2-1), the seeding disc (2-1) is fixedly connected with the upper end of a seeding disc rotating shaft (2-4), the seeding disc rotating shaft (2-4) is rotatably connected with the main frame (1-1), a seeding driving wheel (2-3) is fixedly connected with a rear wheel frame (1-5), a seeding driving shaft (2-5) is rotatably connected with the right end of the main frame (1-1), the seeding driving wheel (2-3) is in transmission connection with the seeding driving shaft (2-5), and the seeding disc rotating shaft (2-4) is in transmission connection with the seeding driving shaft (2-5).

4. The seed changing device for seeding in corn district as claimed in claim 3, characterized in that: the seed changing box (3) comprises a cylindrical box (3-1), small seed boxes (3-2) at intervals, a seed box gear (3-3), a supporting plate (3-4), a fixed supporting sleeve (3-5) and a seed leaking pipe (3-6), a plurality of small seed boxes (3-2) at intervals are uniformly arranged in the circumferential direction in the cylindrical box (3-1), the seed box gear (3-3) is fixedly connected at the outer end of the cylindrical box (3-1), the supporting plate (3-4) is fixedly connected at the upper end of the fixed supporting sleeve (3-5), the cylindrical box (3-1) is rotatably connected with the fixed supporting sleeve (3-5) and is attached to the supporting plate (3-4), the seed leaking pipe (3-6) is fixedly connected at the lower end of the supporting plate (3-4), the fixed supporting sleeve (3-5) is fixedly connected on a main frame (1-1), the lower end of the seed leaking pipe (3-6) is connected with the seeding disc (2-1) in a sliding way.

5. The seed changing device for seeding in corn district as claimed in claim 4, characterized in that: the seed changing transmission mechanism (4) comprises a replacing chain wheel (4-1) and a supporting shaft (4-2), the seed changing device comprises a seed changing gear (4-3) and a seed changing transmission shaft (4-4), a seed changing chain wheel (4-1) is fixedly connected to an installation seat (1-6) through a bolt, a support shaft (4-2) is rotatably connected to a main frame (1-1), the seed changing gear (4-3) is fixedly connected to the support shaft (4-2), the seed changing transmission shaft (4-4) is rotatably connected to a transmission support (1-7), the seed changing chain wheel (4-1) is in transmission connection with the seed changing transmission shaft (4-4), the support shaft (4-2) is in transmission connection with the seed changing transmission shaft (4-4), and the seed changing gear (4-3) is in meshing transmission connection with a seed box gear (3-3).

6. The seed changing device for seeding in corn district as claimed in claim 5, characterized in that: the tensioning mechanism (5) comprises a sliding seat (5-1), a tensioning chain wheel (5-2) and a tension spring (5-3), the tensioning chain wheel (5-2) is rotatably connected onto the sliding seat (5-1), the sliding seat (5-1) is slidably connected onto a transmission bracket (1-7), one end of the tension spring (5-3) is fixedly connected with the transmission bracket (1-7), the other end of the tension spring (5-3) is fixedly connected with the sliding seat (5-1), and the tensioning chain wheel (5-2) is connected with a seed changing transmission shaft (4-4) and a replacing chain wheel (4-1) through chain transmission.

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