Seed-metering device with seed changing function

Abstract

The invention discloses a seed-metering device with a seed changing function, and relates to the technical field of seed-metering devices, the seed-metering device comprises a seed-metering shell, a seed suction mechanism and a feeding mechanism, the seed suction mechanism comprises a seed suction shell and a seed suction disc, the seed suction disc is rotatably arranged on the front surface of the seed-metering shell, the side edge of the seed suction shell is rotatably arranged on the seed-metering shell, and the feeding mechanism is arranged on the seed-metering shell. A stock bin is formed between the front face of the seed metering shell and the seed suction disc, a plurality of material holes are formed in the edge of the seed suction disc at equal intervals, a feeding port communicated with the discharging end of the feeding mechanism is formed in the seed metering shell, and a recycling channel is formed in the position, on the same side as the feeding port, of the lower portion of the seed metering shell. The seed suction disc is matched with a negative pressure adsorption system, precise adsorption and quantitative sowing of single seeds can be achieved, the unique seed recovery channel and the drainage plate mechanism are arranged, unsown seeds can automatically return to the stock bin, and through the matched design of the right-angle frame and the material holes, each material hole is effectively controlled to only adsorb one seed, so that the seed recycling efficiency is improved. The seeding requirements of seeds with different particle sizes are met.

Description

Technical Field

[0001] The invention relates to the technical field of seed metering devices, in particular to a seed metering device with a seed changing function. Background Art

[0002] The seed meter is the core component of agricultural seeding machinery, which is mainly used to achieve quantitative and orderly seed placement. Its function directly affects the seeding quality, seed utilization rate and crop growth uniformity.

[0003] A seed metering device such as "CN117256268A" includes: an outer shell, a rotating disk, a baffle, and a first seed cleaning structure; the outer shell has a cavity; the outer shell is provided with a seed inlet, a seed discharge port, and an air extraction hole; the rotating disk is rotatably arranged in the cavity, and the rotating disk divides the cavity into a first cavity and a second cavity; the rotating disk is sealed and fitted with the edge of the first cavity; the air extraction hole is connected to the first cavity; the baffle is fixedly arranged in the second cavity; the baffle divides the second cavity into a first area and a second area; the rotating disk is provided with suction holes, and the suction holes in the first area are connected to the first cavity, and the suction holes in the second area are disconnected from the first cavity; the first seed cleaning structure includes a plate body fixedly connected to the outer shell, a seed cleaning member rotatably connected to the plate body, and a driving member rotatably connected to the plate body; the seed cleaning member is located in the first area; the driving member can drive the seed cleaning member to rotate. It can effectively ensure that seeds are output at a predetermined quantity at a uniform speed;

[0004] However, in the prior art, the seed metering devices currently used in agricultural production have the following main technical defects: the air-suction seed metering devices need to be stopped and disassembled when changing seeds, which seriously affects the working efficiency; most seed metering devices lack seed recovery function, and the excess seeds that are not sown cannot be recycled. Especially for the precision sowing of small-particle seeds, the existing equipment generally has problems such as reseeding and missed sowing, which seriously affects the sowing quality and the uniformity of crop growth. Summary of the invention

[0005] In view of the above existing problems, the present invention is proposed.

[0006] The purpose of the invention is to solve the problem of inconvenience in changing seeds of a seed meter in the prior art.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] On the one hand, the present invention provides a seed-changing device, which comprises a seed-discharging shell, a seed-sucking mechanism and a feeding mechanism, wherein the seed-sucking mechanism comprises a seed-sucking shell and a seed-sucking tray, the seed-sucking tray is rotatably arranged on the front face of the seed-discharging shell, the side of the seed-sucking shell is rotatably arranged on the seed-discharging shell, a material bin is formed between the front face of the seed-discharging shell and the seed-sucking tray, a plurality of material holes are equidistantly provided at the edge of the seed-sucking tray, a feed port connected to the discharge end of the feeding mechanism is provided on the seed-discharging shell, a recovery channel is provided below the seed-discharging shell on the same side of the feed port, a supporting plate is rotatably provided in the material bin between the recovery channel and the feed port, an inclined plate is provided at the lower end of the material bin, the lower end of the inclined plate extends to the bottom of the recovery channel, a sowing channel connected to the outside is formed between the other end of the inclined plate and the seed-sucking shell, and a drainage plate is rotatably provided on the inner wall of the material bin above the sowing channel.

[0009] Furthermore, a motor is provided on the back side of the seed dispensing shell, a rotating shaft is rotatably provided at the center position of the seed dispensing shell, an edge block is provided on the end face of the rotating shaft, and an edge groove which is fitted with the edge block is opened at the center position of the seed suction disk. The rotating shaft is driven to rotate by the motor. Since the edge block and the edge groove are linked, the rotation of the rotating shaft can drive the synchronous rotation of the seed suction disk, and the seeds adsorbed on the material holes can be quantitatively transferred to the outlet position for convenient sowing.

[0010] Furthermore, the feeding mechanism includes a feeding chamber and a feeding valve plate, the feeding chamber is arranged above one side of the back side of the seeding shell, the upper end of the feeding chamber is connected with a feeding pipe, the feeding valve plate is horizontally slidably arranged at the lower end opening of the feeding chamber, a first cylinder is arranged outside the seeding shell, the feeding valve plate is driven to slide by the first cylinder, a triangular support is arranged in the feeding port, the upper end of the triangular support is located at the side of the feeding end of the feeding chamber away from the seeding shell, the seeds falling from the feeding chamber can be smoothly guided into the feeding port through the provided triangular support, when feeding, a certain amount of seeds are injected into the feeding chamber through the feeding pipe, the feeding valve plate in the initial state is located at the lower end opening of the feeding chamber and closed with it, when sowing is required, the first cylinder is driven to contract, the output end of the first cylinder pulls the feeding valve plate to contract, the feeding valve plate is separated from the lower end of the feeding chamber, the seeds in the feeding chamber enter the feeding port along the triangular support and fall onto the supporting plate, in preparation for sowing.

[0011] Furthermore, a fixing frame is provided above the material bin. One end of the material supporting plate is rotatably arranged on the seed metering housing through a first shaft body. The first shaft body is located below one end of the fixing frame. A transfer cavity is formed in the material bin above the fixing frame and the material supporting plate. The drainage plate is located between the transfer cavity and the upper end of the sowing channel. When the drainage plate rotates and opens, the seeds fall into the sowing channel under the action of gravity. On the contrary, when one end of the drainage plate fits against the end face of the inclined plate, the seeds will flow along the drainage plate and the inclined plate to the recovery channel. In addition, the fixing frame is inclined. The seeds that are not successfully transferred to the sowing channel can fall on the fixing frame and flow back onto the material supporting plate again.

[0012] Furthermore, an assembly groove adapted to the drainage plate is formed inside the seed metering housing. The drainage plate is rotatably arranged at the upper end of the assembly groove through a second shaft body. The distance between the second shaft body and the upper end of the inclined plate is adapted to the length of the drainage plate.

[0013] Furthermore, the upper middle position of the seed suction housing facing the transfer cavity is provided with a hollow structure. An air duct is connected and communicated at the upper end of the seed suction housing. The end face of the air duct is used for detachably and sealingly communicating with an external fan. By driving the fan, the gas inside the seed suction housing is pumped outwards. The seed suction housing is communicated with the material bin through a material hole. Under the action of air pressure, the seeds located above the material supporting plate are adsorbed on the material hole. As the motor drives the seed suction disc to rotate, the seeds can be sent to the upper position of the sowing channel. After the seeds enter the sowing channel, they gradually lose the influence of wind force, fall off from the material hole, and smoothly fall downwards from the sowing channel to achieve sowing.

[0014] Furthermore, one side of the seed suction housing is rotatably connected to the seed metering housing through a fixing shaft. The other end of the seed suction housing is threadedly assembled with the seed metering housing through a bolt. A sealing groove adapted to the seed suction disc is provided at the inner edge of the seed suction housing. When opening the seed suction housing, the bolt can be rotated and removed first, so that the seed metering housing is separated from the seed suction housing. Rotating the seed suction housing around the fixing shaft can open it, which is convenient for taking out the seed suction disc and then performing operations such as cleaning and maintenance on the inside of the material bin.

[0015] Furthermore, a right-angle frame is provided on the inner wall above the seed metering housing. One end of the right-angle frame extends to the side of the seed suction disc facing the material bin. When the material hole, the right-angle frame, and the rotating shaft are on the same straight line, the distance between the tip of the right-angle frame and the material hole is not greater than the diameter of the seed. Usually, a single material hole can adsorb one seed. When the material hole adsorbed with multiple seeds passes through the right-angle frame, the tip of the right-angle frame can scrape off the multiple seeds in the material hole in the material hole to achieve quantitative sowing.

[0016] Further, a fixed seat is provided above the back surface of the seed metering housing. A second air cylinder and a third air cylinder are respectively rotatably provided on the fixed seat. The end faces of the first shaft body and the second shaft body respectively extend to the back surface of the seed metering housing and are linked with a first hinge bar and a second hinge bar. The output ends of the second air cylinder and the third air cylinder are respectively hinged to the first hinge bar and the second hinge bar. By driving the second air cylinder to extend or contract, the overall rotation of the first hinge bar and the first shaft body can be driven to rotate slightly, realizing the rotation of the material supporting plate. Similarly, the third air cylinder realizes the rotation of the drainage plate.

[0017] The beneficial effects of the present invention are as follows:

[0018] The suction seed disk and the negative pressure adsorption system provided in the present invention can realize the precise adsorption and quantitative sowing of single seeds. The unique seed recovery channel and drainage plate mechanism are set, and the unsewn seeds can automatically return to the bin for reuse. Through the cooperative design of the right-angle frame and the material holes, it effectively controls that only one seed is adsorbed in each material hole, adapting to the sowing requirements of seeds with different particle sizes. This device is particularly suitable for the precision sowing operation of small particle seeds, and can greatly improve the sowing quality and operation efficiency. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 A three-dimensional view of a seed metering device with a seed changing function provided by the present invention;

[0021] Figure 2 A schematic diagram of the internal structure of the suction seed housing of a seed metering device with a seed changing function provided by the present invention;

[0022] Figure 3 A schematic diagram of the external structure of the suction seed housing of a seed metering device with a seed changing function provided by the present invention;

[0023] Figure 4 A schematic diagram of the assembly of the seed metering housing and the suction seed disk of a seed metering device with a seed changing function provided by the present invention;

[0024] Figure 5 A schematic diagram of the positions of the suction seed disk, the material supporting plate and the drainage plate of a seed metering device with a seed changing function provided by the present invention;

[0025] Figure 6 A schematic diagram of the back structure of a seed metering device with a seed changing function provided by the present invention;

[0026] Figure 7 Assembly schematic diagram of the seed metering housing, the material supporting plate and the drainage plate of a seed metering device with a seed changing function provided by the present invention;

[0027] Figure 8 Schematic diagram of the structure of the seed metering housing of a seed metering device with a seed changing function provided by the present invention;

[0028] Figure 9 Schematic diagram of the feeding mechanism of a seed metering device with a seed changing function provided by the present invention.

[0029] Legend:

[0030] 1. Seed metering housing; 211. Seed suction housing; 212. Seed suction disc; 213. Hopper; 214. Material hole; 215. Feeding port; 216. Recovery channel; 217. Material supporting plate; 218. Inclined plate; 219. Sowing channel; 220. Drainage plate; 311. Motor; 312. Rotating shaft; 313. Prismatic block; 314. Prismatic groove; 411. Feeding cavity; 412. Feeding valve plate; 413. Feeding pipe; 414. First cylinder; 415. Triangular support; 511. Fixed frame; 512. First shaft body; 513. Transfer cavity; 611. Assembly groove; 612. Second shaft body; 621. Air duct; 631. Fixed shaft; 632. Bolt; 633. Sealing groove; 7. Right-angle frame; 811. Fixed seat; 812. Second cylinder; 813. Third cylinder; 814. First hinge bar; 815. Second hinge bar. Detailed implementation manners

[0031] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings of the specification.

[0032] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0033] Secondly, as used herein, "one embodiment" or "an embodiment" refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other with other embodiments.

[0034] Please refer to Figures 1 - 9The present invention provides a technical solution: a seed-sending device with a seed-changing function, comprising a seed-sending shell 1, a seed-sucking mechanism and a feeding mechanism, wherein the seed-sucking mechanism comprises a seed-sucking shell 211 and a seed-sucking disc 212, wherein the seed-sucking disc 212 is rotatably arranged on the front of the seed-sending shell 1, and the seed-sucking shell 211 is rotatably arranged on the side of the seed-sending shell 1, and a silo 213 is formed between the front of the seed-sending shell 1 and the seed-sucking disc 212, and a plurality of material holes 214 are equidistantly provided at the edge of the seed-sucking disc 212, and a silo 213 is formed on the seed-sending shell 1 to connect to the discharge end of the feeding mechanism. A feed port 215 is connected and arranged, and a recovery channel 216 is opened below the seed discharging shell 1 on the same side of the feed port 215. A supporting plate 217 is rotatably provided in the material bin 213 between the recovery channel 216 and the feed port 215. An inclined plate 218 is provided at the lower end of the material bin 213. The lower end of the inclined plate 218 extends to below the recovery channel 216. A sowing channel 219 connected to the outside is formed between the other end of the inclined plate 218 and the seed suction shell 211. A drainage plate 220 is rotatably provided on the inner wall of the material bin 213 above the sowing channel 219.

[0035] like Figures 1 - 9 As shown, a motor 311 is provided on the back of the seed dispensing shell 1, a rotating shaft 312 is rotatably provided at the center position of the seed dispensing shell 1, an edge block 313 is provided on the end face of the rotating shaft 312, and a groove 314 which is fitted with the edge block 313 is opened at the center position of the seed suction disk 212. The rotating shaft 312 is driven to rotate by the motor 311. Since the edge block 313 and the edge groove 314 are linked, the rotation of the rotating shaft 312 can drive the seed suction disk 212 to rotate synchronously, and the seeds adsorbed on the material hole 214 can be quantitatively transferred to the outlet position for easy sowing.

[0036] like Figures 1 - 9 As shown, the feeding mechanism includes a feeding chamber 411 and a feeding valve plate 412. The feeding chamber 411 is arranged above one side of the back side of the seeding shell 1. The upper end of the feeding chamber 411 is connected with a feeding pipe 413. The feeding valve plate 412 is horizontally slidably arranged at the lower end opening of the feeding chamber 411. A first cylinder 414 is arranged outside the seeding shell 1. The feeding valve plate 412 is driven to slide by the first cylinder 414. A triangular support 415 is arranged in the feeding port 215. The upper end of the triangular support 415 is located on the side of the feeding end of the feeding chamber 411 away from the seeding shell 1. Through the provided triangular support 415, the feeding port 215 can be The seeds dropped from the feed chamber 411 are smoothly guided into the feed port 215. When feeding, a certain amount of seeds are injected into the feed chamber 411 through the feed pipe 413. The feed valve plate 412 in the initial state is located at the lower opening of the feed chamber 411 and closed with it. When sowing is required, the first cylinder 414 is driven to contract, and the output end of the first cylinder 414 pulls the feed valve plate 412 to contract, and the feed valve plate 412 is separated from the lower end of the feed chamber 411. The seeds in the feed chamber 411 enter the feed port 215 along the triangular support 415 and fall onto the support plate 217, preparing for sowing.

[0037] likeFigures 1 - 9 As shown in the figure, a fixing frame 511 is provided above the bin 213. One end of the material supporting plate 217 is rotatably arranged on the seed metering housing 1 through a first shaft body 512. The first shaft body 512 is located below one end of the fixing frame 511. A transfer cavity 513 is formed in the bin 213 above the fixing frame 511 and the material supporting plate 217. The drainage plate 220 is located between the transfer cavity 513 and the upper end of the sowing channel 219. When the drainage plate 220 rotates and opens, the seeds fall into the sowing channel 219 under the action of gravity. On the contrary, when one end of the drainage plate 220 fits against the end face of the inclined plate 218, the seeds will flow along the drainage plate 220 and the inclined plate 218 to the recovery channel 216. In addition, the fixing frame 511 is inclined. The seeds that are not successfully transferred to the sowing channel 219 can fall on the fixing frame 511 and flow back onto the material supporting plate 217 again.

[0038] As Figures 1 - 9 shown in the figure, an assembly groove 611 adapted to the drainage plate 220 is formed inside the seed metering housing 1. The drainage plate 220 is rotatably arranged at the upper end of the assembly groove 611 through a second shaft body 612. The distance between the second shaft body 612 and the upper end of the inclined plate 218 is adapted to the length of the drainage plate 220.

[0039] As Figures 1 - 9 shown in the figure, the upper middle position of the seed suction housing 211 facing the transfer cavity 513 is provided with a hollow structure. An air duct 621 is connected and communicated with the upper end of the seed suction housing 211. The end face of the air duct 621 is used for detachably and sealingly connecting with an external fan. By driving the fan, the gas inside the seed suction housing 211 is pumped outwards. The seed suction housing 211 is communicated with the bin 213 through the material holes 214. Under the action of air pressure, the seeds above the material supporting plate 217 are adsorbed on the material holes 214. As the motor 311 drives the seed suction disc 212 to rotate, the seeds can be sent to the upper position of the sowing channel 219. After the seeds enter the sowing channel 219, they gradually lose the influence of wind force, fall from the material holes 214, and smoothly fall downward from the sowing channel 219 to achieve sowing.

[0040] As Figures 1 - 9 shown in the figure, one side of the seed suction housing 211 is rotatably connected to the seed metering housing 1 through a fixed shaft 631. The other end of the seed suction housing 211 is threadedly assembled with the seed metering housing 1 through a bolt 632. A sealing groove 633 adapted to the seed suction disc 212 is provided at the inner edge of the seed suction housing 211. When opening the seed suction housing 211, the bolt 632 can be rotated and removed first, so that the seed metering housing 1 is separated from the seed suction housing 211. By rotating the seed suction housing 211 around the fixed shaft 631, it can be opened, which is convenient for taking out the seed suction disc 212 and then performing operations such as cleaning and maintenance on the inside of the bin 213.

[0041] As Figures 1 - 9As shown in the figure, on the upper inner wall of the seed metering housing 1, there is a right-angle frame 7. One end of the right-angle frame 7 extends to the side of the seed suction disc 212 facing the hopper 213. When the seed hole 214, the right-angle frame 7, and the rotating shaft 312 are on the same straight line, the distance between the tip of the right-angle frame 7 and the seed hole 214 is not greater than the diameter of the seeds. Usually, a single seed hole 214 can adsorb one seed. When the seed hole 214 with multiple adsorbed seeds passes by the right-angle frame 7, the tip of the right-angle frame 7 can hang in the seed hole 214 and scrape off the multiple seeds, realizing quantitative seeding.

[0042] As Figures 1 - 9 As shown in the figure, above the back of the seed metering housing 1, there is a fixed seat 811. A second cylinder 812 and a third cylinder 813 are respectively rotatably arranged on the fixed seat 811. The end faces of the first shaft body 512 and the second shaft body 612 respectively extend to the back of the seed metering housing 1 and are linked with a first hinge bar 814 and a second hinge bar 815. The output ends of the second cylinder 812 and the third cylinder 813 are respectively hinged to the first hinge bar 814 and the second hinge bar 815. By driving the second cylinder 812 to extend or shorten, the overall rotation of the first hinge bar 814 and the first shaft body 512 can be driven to achieve a small rotation of the material supporting plate 217. Similarly, the third cylinder 813 can achieve the rotation of the diversion plate 220.

[0043] Working principle: During the seeding operation, the seeds are placed in the feeding chamber 411 of the feeding mechanism. The seeds fall from below into the feeding port 215 and enter the hopper 213. The air inlet end of the externally installed fan is hermetically connected to the air duct 621, and the fan is started. The gas in the hopper 213 is inhaled into the seed suction housing 211 through the seed holes 214 on the seed suction disc 212 and discharged outward. During this process, the seeds on the material supporting plate 217 are adsorbed on the seed holes 214 by the suction force. The motor 311 is started to rotate the seed suction disc 212. The seed holes 214 on the seed suction disc 212 with adsorbed seeds rotate and move towards the seeding channel 219. When the seed holes 214 enter the seeding channel 219, the diversion plate 220 rotates downward to open, and the seeding channel 219 is communicated with the hopper 213. At this time, the seeds also lose the wind suction and fall downward, directly passing through the seeding channel 219 and falling into the previously dug pit holes to complete seeding. When the required number of seeds is sown, the diversion plate 220 rotates in the reverse direction and closes with the inclined plate 218. The continuously rotating seeds are diverted by the diversion plate 220 to the inclined plate 218 and fall into the recovery channel 216 for recovery. When starting the next round of seeding, the diversion plate 220 is rotated to open, and the above operations are repeated for seeding. After seeding is completed, the material supporting plate 217 is driven to rotate, and the seeds on the material supporting plate 217 fall below the hopper 213 and are transferred out through the recovery channel 216. The material supporting plate 217 is reset to carry the seeds for the next feeding.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A seed metering device with a seed changing function, comprising a seed metering housing (1), a seed sucking mechanism and a feeding mechanism. The seed sucking mechanism includes a seed sucking housing (211) and a seed sucking disc (212). The seed sucking disc (212) is rotatably arranged on the front surface of the seed metering housing (1). The side of the seed sucking housing (211) is rotatably arranged on the seed metering housing (1). A hopper (213) is formed between the front surface of the seed metering housing (1) and the seed sucking disc (212). It is characterized in that: A plurality of material holes (214) are equidistantly formed at the edge of the seed suction disc (212). An inlet port (215) communicating with the discharge end of the feeding mechanism is formed on the seed metering housing (1). A recovery channel (216) is formed below the seed metering housing (1) on the same side as the inlet port (215). A material supporting plate (217) is rotatably arranged in the material bin (213) between the recovery channel (216) and the inlet port (215). An inclined plate (218) is arranged at the lower end of the material bin (213). The lower end of the inclined plate (218) extends below the recovery channel (216). A sowing channel (219) communicating with the outside is formed between the other end of the inclined plate (218) and the seed suction housing (211). A diversion plate (220) is rotatably arranged on the inner wall of the material bin (213) above the sowing channel (219).

2. The seed metering device with a variety-changing function according to claim 1, characterized in that, A motor (311) is arranged on the back of the seed metering housing (1). A rotating shaft (312) is rotatably arranged at the central position of the seed metering housing (1). A prism block (313) is arranged on the end face of the rotating shaft (312). A prism groove (314) adapted to be engaged with the prism block (313) is formed at the central position of the seed suction disc (212).

3. The metering device with variety-changing function according to claim 1, characterized in that, The feeding mechanism includes a feeding chamber (411) and a feeding valve plate (412). The feeding chamber (411) is arranged above one side of the back of the seed metering housing (1). A feeding pipe (413) is communicated with the upper end of the feeding chamber (411). The feeding valve plate (412) is horizontally slidably arranged at the lower end opening of the feeding chamber (411). A first cylinder (414) is arranged outside the seed metering housing (1). The feeding valve plate (412) is driven to slide by the first cylinder (414). A triangular support (415) is arranged in the inlet port (215). The upper end of the triangular support (415) is located on the side of the discharge end of the feeding chamber (411) away from the seed metering housing (1).

4. The seed metering device with the variety-changing function according to claim 3, characterized in that, A fixing frame (511) is arranged in the upper middle part of the material bin (213). One end of the material supporting plate (217) is rotatably arranged on the seed metering housing (1) through a first shaft body (512). The first shaft body (512) is located below one end of the fixing frame (511). A transfer chamber (513) is formed in the material bin (213) above the fixing frame (511) and the material supporting plate (217). The diversion plate (220) is located between the upper ends of the transfer chamber (513) and the sowing channel (219).

5. A seed metering device with a seed variety changing function according to claim 4, characterized in that, An assembly groove (611) adapted to the diversion plate (220) is formed inside the seed metering housing (1). The diversion plate (220) is rotatably arranged at the upper end of the assembly groove (611) through a second shaft body (612). The distance between the second shaft body (612) and the upper end of the inclined plate (218) is adapted to the length of the diversion plate (220).

6. The seed metering device with variety-changing function according to claim 4, characterized in that, The upper middle part of the seed suction housing (211) facing the transfer chamber (513) is provided with a hollow structure. An air pipe (621) is communicated with the upper end of the seed suction housing (211). The end face of the air pipe (621) is used for detachably and sealingly communicating with an external fan.

7. The seed metering device with the variety-changing function according to claim 6, wherein One side of the seed suction housing (211) is rotatably connected to the seed metering housing (1) through a fixed shaft (631), and the other end of the seed suction housing (211) is threadedly assembled and connected to the seed metering housing (1) through a bolt (632). A sealing groove (633) adapted to the seed suction disc (212) is provided at the inner edge of the seed suction housing (211).

8. A seed metering device with a variety-changing function according to claim 7, characterized in that, A right-angle frame (7) is provided on the inner wall above the seed metering housing (1). One end of the right-angle frame (7) extends to the side of the seed suction disc (212) facing the hopper (213). When the seed hole (214), the right-angle frame (7) and the rotating shaft (312) are on the same straight line, the distance between the tip of the right-angle frame (7) and the seed hole (214) is not greater than the diameter of the seed.

9. The metering device with variety-changing function according to claim 8, characterized in that, A fixed seat (811) is provided above the back of the seed metering housing (1). A second cylinder (812) and a third cylinder (813) are respectively rotatably provided on the fixed seat (811). The end faces of the first shaft body (512) and the second shaft body (612) respectively extend to the back of the seed metering housing (1) and are linked with a first hinge bar (814) and a second hinge bar (815). The output ends of the second cylinder (812) and the third cylinder (813) are respectively hinged to the first hinge bar (814) and the second hinge bar (815).

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