Precise control of negative pressure precision seed metering device

Abstract

The application discloses a precision-controlled negative pressure precision seed-metering device, which comprises a first shell (17), a second shell (5), a power input shaft (4) and a seed taking disc (15), wherein a seed dropping trigger mechanism (13) is arranged on the seed taking disc (15) and is arranged on the side of the seed taking disc (15) relative to a negative pressure cavity (19) of a seeding port (6), and the seed dropping trigger mechanism (13) is one of a shielding wheel or a positive pressure air blowing nozzle. The application has the beneficial effects that: through a very simple structure, the negative pressure area on the seed taking disc is precisely controlled, the seed dropping time is greatly shortened, the control precision is improved, the precision can reach a single hole, the structure is reliable, the failure rate is extremely low, and thus the seed-metering quality and efficiency are guaranteed.

Description

TECHNICAL FIELD

[0001] The application relates to a seed sowing device, in particular a precision controlled negative pressure precision seed sowing device. BACKGROUND

[0002] The seed sowing device is a key structure for ensuring the sowing quality of a seeding machine and is of great significance to the growth of crops.

[0003] At present, the seed sowing device mainly includes a mechanical type and an air type, and in general, the mechanical type has good universality but has the problems of seed damage, uneven seed sowing and seed missing; the air type forms a certain vacuum degree in a closed air chamber, uses suction force or pressure to fix the seeds on the holes of a seed taking disc, and rotates with the seed taking disc, when rotating out of the air chamber, the seeds are no longer affected by the suction force or pressure and fall into a seed sowing pipe by gravity to realize seed sowing.

[0004] The air suction type seed sowing device has the advantages of air flow adsorption seed sowing, avoids seed damage caused by mechanical structures, has the characteristics of wide adaptability and high operation precision, and is the main development trend in the future.

[0005] The existing air suction type seed sowing device has a simple structure and is in the form of a fixed negative pressure area, cannot adjust the seed sowing angle, has poor adaptability of the seed sowing speed of the seed sowing device, and limits the operation speed in high-speed seed sowing, and the existing air suction type seed sowing device directly discharges the air flow after forming the negative pressure into the air, causing resource waste. Meanwhile, the seed sowing holes in the seed sowing area are usually shielded by a shielding piece in the seed sowing process, and the shielding piece and the seed taking disc are simply shielded, the pressure between the shielding piece and the seed taking disc needs to be increased to ensure the tightness of the shielding, the shielding piece or the seed taking disc is easily damaged, and when the pressure is small, the sealing is not tight, the seeds cannot be discharged, the seed sowing fails, and the seeds are missed.

[0006] CN214628017U discloses a single-double seed adjustable air suction type cotton seed sowing device, adjusts the single-double seed sowing through left and right seed taking discs, has a complex structure and a relatively high failure rate.

[0007] CN209462922U discloses a quantity adjustable air suction disc type hill-drop seed sowing device, adjusts the effective suction hole quantity through the cooperation of the quantitative adjusting disc and the seed suction disc, and adjusts the quantity of seeds per hole.

[0008] Meanwhile, the seed sowing devices described above mainly control and adjust the seed sowing quantity, and the seed sowing mainly relies on the disappearance of the negative pressure and the action of gravity falling to realize the seed sowing, and the control of the seed sowing time is weak, especially in the current high-speed seed sowing, the seed sowing time is different, and the placement position of the precision seed sowing is uneven.

[0009] CN110249761A discloses a negative pressure seed suction and positive pressure seed cleaning type precision seed sowing device, which controls the suction or release of seeds through a circuit system composed of two-position three-way electromagnetic valves, but the structure is relatively complex, the failure rate is high, and the resulting missed sowing is intolerable in precision sowing.

[0010] CN108271475A discloses an electrically-driven single-double-row universal cylinder wheel type air suction precision seed sowing device and seed sowing method, which adopts a positive pressure chamber to release seeds, but the precision of seed release is still difficult to control. SUMMARY

[0011] To solve these problems, the present application provides a precision-controlled negative pressure precision seed sowing device, which can be locally adjusted along the circumferential trajectory formed by a plurality of seed taking holes through the seed throwing trigger mechanism in the device. The negative pressure area on the seed taking disc can be adjusted through the seed throwing trigger mechanism, the separation position of the seed and the seed taking disc is changed, and the seed throwing angle is adjusted, the seed throwing speed adaptation performance of the seed sowing device is improved, and the effect of high-speed seed sowing is achieved. In the design of the seed throwing system, a negative pressure exhaust pipe is added, the airflow discharged after the seed sowing device forms a negative pressure is introduced into the seed throwing pipe, and the purposes of accelerating seed throwing, airflow unblocking and resource recycling are achieved.

[0012] To achieve the purpose of the present application, the technical scheme of the present application is as follows: comprising a first shell (17), a second shell (5), a power input shaft (4) and a seed taking disc (15), characterized in that: the first shell (17) and the second shell (5) are buckled to form a cylindrical chamber, the power input shaft (4) passes through the chamber, the seed taking disc (15) is fixedly connected to the power input shaft (4) to divide the chamber into a seed chamber (8) and a negative pressure chamber (19), the seed taking disc (15) is provided with seed taking holes (2) arranged in a ring around the input shaft (4), the first shell (17) is provided with a negative pressure suction pipe (1), and the second shell (5) is provided with a seed inlet (3) and a seed receiving port (6).

[0013] A seed throwing trigger mechanism (13) is arranged on the seed taking disc (15) on one side of the negative pressure chamber (19), the seed throwing trigger mechanism (13) is arranged on the negative pressure chamber (19) side of the seed taking disc (15) relative to the seed receiving port (6), and the seed throwing trigger mechanism (13) is one of a shielding wheel or a positive pressure air blowing nozzle.

[0014] The seed receiving port (6) is provided with a seed guide pipe (7) and a seed throwing pipe (12).

[0015] The shielding wheel is a roller, the wheel surface of the roller is in contact with the seed taking disc (15) and can rotate with the rotation of the seed taking disc (15), and at the same time, the surface of the shielding wheel can shield at least one group of seed taking holes (2).

[0016] Further, the seed feeding trigger mechanism (13) is preferably a positive pressure air nozzle, especially suitable for high speed seed metering.

[0017] The positive pressure air nozzle comprises a positive pressure air tube (13-2) and an air nozzle base (13-1), and the air nozzle base (13-1) is provided with an air outlet corresponding to the running track of the seed taking hole (2) corresponding to the inoculation port (6).

[0018] Further, the above-mentioned positive pressure air nozzle is preferably a trigger type air nozzle.

[0019] The trigger type air nozzle comprises a positive pressure air tube (13-2), an air nozzle base (13-1) and an air outlet, and a trigger mechanism is arranged at the air outlet, the trigger mechanism comprises a first telescopic tube (13-5) and a second telescopic tube (13-4) nested with each other, both the first telescopic tube (13-5) and the second telescopic tube (13-4) are hollow tubes, a second reset spring (13-9) and a limiting block (13-8) are arranged between the first telescopic tube (13-5) and the second telescopic tube (13-4), so that the first telescopic tube (13-5) and the second telescopic tube (13-4) can be telescopically displaced by a certain distance, the second telescopic tube (13-4) is provided with a connecting air hole (13-3) on the front tube wall, and the end of the second telescopic tube (13-4) is provided with a blocking block (13-10), the movement of the blocking block (13-10) can make the air outlet of the positive pressure air tube (13-2) switch between closed and open states, and further make the connecting air hole (13-3) and the air outlet of the positive pressure air tube (13-2) switch between communication and disconnection.

[0020] The first telescopic tube (13-5) is arranged in a piston shape on the air nozzle base (13-1) and can be telescopically displaced on the air nozzle base (13-1), a first reset spring (13-7) is arranged between the first telescopic tube (13-5) and the air nozzle base (13-1), and a roller (13-6) is arranged at the outer end of the first telescopic tube (13-5).

[0021] Alternatively, the trigger type air nozzle comprises a positive pressure air tube (13-2) and an air nozzle base (13-1), and a trigger mechanism is arranged on the air nozzle base (13-1), the trigger mechanism comprises a first telescopic tube (13-5), the first telescopic tube (13-5) is a hollow tube, the first telescopic tube (13-5) is arranged in a piston shape on the air nozzle base (13-1) and can be telescopically displaced on the air nozzle base (13-1), a first reset spring (13-7) is arranged between the first telescopic tube (13-5) and the air nozzle base (13-1), and a roller (13-6) is arranged at the outer end of the first telescopic tube (13-5).

[0022] The pipe wall of the front part of the first telescopic pipe (13-5) is provided with a gas connection hole (13-3), the gas outlet of the positive pressure gas pipe (13-2) is a gas channel (13-11) corresponding to the gas connection hole (13-3) of the first telescopic pipe (13-5) on the nozzle base (13-1), and the gas connection hole (13-3) is switched between being in communication or being disconnected with the gas outlet of the positive pressure gas pipe (13-2) when the first telescopic pipe (13-5) is telescoped in the nozzle base (13-1) like a piston.

[0023] Further, the seed taking disc (15) on one side of the negative pressure cavity (19) is preferably provided with a seed cleaning mechanism (14) behind the seed taking trigger mechanism (13), the seed cleaning mechanism (14) comprises a wheel body, a plurality of seed cleaning teeth are arranged on the wheel body, the length of the seed cleaning teeth is greater than the thickness of the seed taking disc (15) and the seed cleaning teeth are engaged with the seed taking holes (2) on the seed taking disc (15) and rotate through the seed taking holes (2).

[0024] Further, at least one of a detection sensor (9), a seed throwing connecting pipe (10) and a connecting hose (11) can be arranged between the seed guiding pipe (7) and the seed throwing pipe (12), and a negative pressure exhaust pipe (18) can be arranged on the seed throwing connecting pipe (10) or the connecting hose (11).

[0025] Further, the precision controlled negative pressure precision seed metering device can further form a seeding machine, in particular a high-speed seeding machine.

[0026] The present application has the following advantages: through a very simple structure, the negative pressure area on the seed taking disc is precisely controlled, the seed throwing time is greatly shortened, the control precision is improved, the precision can reach single hole, the structure is reliable, the failure rate is extremely low, and the seed metering quality and efficiency are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure schematic view of the first perspective of the embodiment 1 of the present application.

[0028] Figure 2 It is a structure schematic view of the second perspective of the embodiment 1 of the present application.

[0029] Figure 3 It is a structure schematic view of the first perspective of the embodiment 1 of the present application. Figure 1 It is a structure schematic view of the first perspective of the embodiment 1 of the present application.

[0030] Figure 4 It is a structure schematic view of the first perspective of the embodiment 1 of the present application.

[0031] Figure 5 It is a structure schematic view of the second perspective of the embodiment 2 of the present application.

[0032] Figure 6Structure schematic diagram of embodiment 3 of the present application.

[0033] Figure 7 Structure schematic diagram of embodiment 4 of the present application.

[0034] Marked in the figure: negative pressure air flow port 1, seed taking hole 2, seed feeding port 3, power input shaft 4, second shell 5, inoculation port 6, seed guiding tube 7, seed cavity 8, detection sensor 9, seed feeding connecting tube 10, connecting hose 11, seed feeding tube 12, seed feeding trigger mechanism 13, air jet nozzle base 13-1, positive pressure air tube 13-2, air guiding hole 13-3, second telescopic tube 13-4, first telescopic tube 13-5, roller 13-6, first reset spring 13-7, limiting block 13-8, second reset spring 13-9, blocking block 13-10, air passage 13-11, seed cleaning mechanism 14, seed taking disc 15, shaft sleeve 16, first shell 17, negative pressure air tube 18, negative pressure cavity 19.

[0035] The arrow in the figure shows the action direction of the trigger mechanism. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present application are described in detail below.

[0037] Embodiment 1: Reference Figures 1-4 Structure schematic diagram of embodiment 1 of the present application, including first shell 17, second shell 5, power input shaft 4 and seed taking disc 15, the first shell 17 and the second shell 5 are buckled to form a cylindrical cavity, the power input shaft 4 passes through the cavity, the seed taking disc 15 is fixedly connected to the power input shaft 4 to divide the cavity into the seed cavity 8 and the negative pressure cavity 19, the seed taking disc 15 is provided with the seed taking holes 2 arranged in a ring shape with the input shaft 4 as the center, the seed taking holes 2 are in the shape of a trumpet mouth, specifically, the diameter of the negative pressure cavity 19 side is larger than that of the seed cavity 8 side, which can reduce the occurrence of seed jamming, the seed taking holes 2 can be one group per one turn of the seed taking disc 15, one seed is fed at a time, of course, 2 or 3 seed taking holes can be set as one group, 2 or 3 seeds can be fed at a time, the first shell 17 is provided with the negative pressure suction tube 1, the second shell 5 is provided with the seed feeding port 3 and the inoculation port 6.

[0038] The seed feeding trigger mechanism 13 is arranged on the seed taking disc 15 on the negative pressure cavity 19 side relative to the inoculation port 6, the seed feeding trigger mechanism 13 is a shielding wheel, the inoculation port 6 is provided with the seed guiding tube 7 and the seed feeding tube 12.

[0039] The shielding wheel is a roller, the wheel surface of the roller is in contact with the seed taking disc 15 and can rotate with the rotation of the seed taking disc 15, at the same time, the surface of the shielding wheel can shield at least one group of seed taking holes 2.

[0040] At least one of the detection sensor 9, the seed dropping connecting pipe 10 and the connecting hose 11 is arranged between the seed guiding pipe 7 and the seed dropping pipe 12, and the negative pressure exhaust pipe 18 is further arranged on the seed dropping connecting pipe 10.

[0041] Further, the seed dropping trigger mechanism 13 behind the seed taking disc 15 on one side of the negative pressure cavity 19 is preferably provided with the seed cleaning mechanism 14, which comprises a wheel body, and a plurality of seed cleaning teeth are arranged on the wheel body, the length of the seed cleaning teeth is greater than the thickness of the seed taking disc 15 and the seed cleaning teeth are engaged with the seed taking holes 2 on the seed taking disc 15, and the seed cleaning mechanism 14 is rotated through the seed taking holes 2.

[0042] The use process of the precision controlled negative pressure precision seed dropping device is as follows: the seeds enter the seed cavity 8 through the seed inlet 3, the machine tool runs, the power input shaft 4 transmits power to the seed taking disc 15 to drive the seed taking disc 15 to run; the negative pressure airflow adsorbs the seeds on the seed taking holes 2 of the seed taking disc 15, and the seeds complete seed taking under the action of negative pressure; the seed dropping trigger mechanism 13 and / or the seed cleaning mechanism 14 are arranged on the first shell 17, the seed dropping trigger mechanism 13 only covers a group of seed taking holes 2 on the seed taking disc 15, the negative pressure of the covered seed taking holes 2 disappears, and the adsorption of the seeds on the seed taking holes 2 also disappears, so that the seeds are separated from the seed taking disc 15 and freely fall to the seed dropping system through the seed inlet 6 and are finally uniformly projected into the seed furrow; in the above process, the seed dropping trigger mechanism 13 can be locally adjusted along a plurality of seed taking holes 2 to change the relative position of the negative pressure area on the seed taking disc 15, so as to adjust the separation position of the seeds and the seed taking disc 15, achieve the effect of adjusting the seed dropping angle and adapting the seed dropping speed; the seed dropping system is provided with the negative pressure exhaust pipe 18, the negative pressure exhaust pipe 18 introduces the airflow discharged after the negative pressure is formed into the seed dropping pipe 12, so as to achieve the purposes of accelerating the seed dropping, airflow unblocking and resource recycling.

[0043] When the seed dropping trigger mechanism 13 on the seed taking disc 15 is triggered, if the seeds on the seed taking holes 2 are stuck and the like, the complete seed dropping can be ensured through the seed cleaning mechanism 14.

[0044] Embodiment 2: refer to Figure 5 The structure schematic diagram of embodiment 2 of the present application is shown, compared with embodiment 1, the difference of the present embodiment is that the seed dropping trigger mechanism 13 is preferably a positive pressure air blowing nozzle, which is particularly suitable for high-speed seed dropping.

[0045] In the present embodiment, the positive pressure air blowing nozzle comprises a positive pressure air pipe 13-2 and a jet nozzle base 13-1, the jet nozzle base 13-1 is provided with an air outlet, the air outlet corresponds to the running track line of the seed taking hole 2 corresponding to the seed inlet 6, and the number of the air outlet corresponds to the number of each group of seed taking holes.

[0046] The positive pressure blowing nozzle of the embodiment is preferably a trigger type nozzle, and a trigger mechanism is arranged at the air outlet. The trigger mechanism comprises a first telescopic pipe 13-5 and a second telescopic pipe 13-4 which are nested with each other. Both the first telescopic pipe 13-5 and the second telescopic pipe 13-4 are hollow pipes. A second reset spring 13-9 and a limiting block 13-8 are arranged between the first telescopic pipe 13-5 and the second telescopic pipe 13-4, so that the first telescopic pipe 13-5 and the second telescopic pipe 13-4 can be telescopically displaced by a certain distance. A gas guiding hole 13-3 is arranged on the front pipe wall of the second telescopic pipe 13-4. A blocking block 13-10 is arranged at the end of the second telescopic pipe 13-4. The movement of the blocking block 13-10 can make the air outlet of the positive pressure air pipe 13-2 switch between the closed and open states, and further make the gas guiding hole 13-3 switch between the communication and disconnection with the air outlet of the positive pressure air pipe 13-2.

[0047] The first telescopic pipe 13-5 is arranged in the form of a piston on the jet nozzle base 13-1 and can be telescopically displaced on the jet nozzle base 13-1. A first reset spring 13-7 is arranged between the first telescopic pipe 13-5 and the jet nozzle base 13-1. A roller 13-6 is arranged at the outer end of the first telescopic pipe 13-5.

[0048] In operation, when the seed taking disc 15 is running, the air outlet of the positive pressure air pipe 13-2 of the seed dropping trigger mechanism 13 is in the blocked state. When the seed taking hole 2 travels to the seed dropping trigger mechanism 13, the front end of the first telescopic pipe 13-5 encounters the seed taking hole and generates an action. The air outlet of the positive pressure air pipe 13-2 is released, and the gas flow flows out of the hollow pipes of the first telescopic pipe 13-5 and the second telescopic pipe 13-4, and generates an impact force on the seed taking hole, so that the seed is dropped into the inoculation port 6. The seed can be quickly and accurately dropped, and the seed dropping time is greatly shortened. High-speed and accurate seed dropping can be realized.

[0049] Embodiment 3: refer to Figure 6 The structure of the embodiment 3 of the application is shown in the figure. Compared with the embodiments 1 and 2, the difference of the embodiment is that the seed dropping trigger mechanism 13 is preferably a positive pressure blowing nozzle. The positive pressure blowing nozzle comprises a positive pressure air pipe 13-2 and a jet nozzle base 13-1. The jet nozzle base 13-1 is provided with an air outlet which corresponds to the travel trajectory line of the seed taking hole 2 corresponding to the inoculation port 6.

[0050] Embodiment 4: refer to Figure 7As shown in the structural schematic diagram of the embodiment 4 of the present application, compared with the previous embodiments, the difference of the present embodiment is that the trigger type air nozzle comprises a positive pressure air pipe 13-2 and a jet nozzle base 13-1, and a trigger mechanism is arranged on the jet nozzle base 13-1, the trigger mechanism comprises a first telescopic pipe 13-5, the first telescopic pipe 13-5 is a hollow pipe, the first telescopic pipe 13-5 is arranged on the jet nozzle base 13-1 in a piston shape and can be telescoped on the jet nozzle base 13-1, a first reset spring 13-7 is arranged between the first telescopic pipe 13-5 and the jet nozzle base 13-1, and a roller 13-6 is arranged on the outer end of the first telescopic pipe 13-5.

[0051] A connecting air hole 13-3 is arranged on the pipe wall of the front part of the first telescopic pipe 13-5, the air outlet of the positive pressure air pipe 13-2 is an air channel 13-11 corresponding to the connecting air hole 13-3 on the first telescopic pipe 13-5 on the jet nozzle base 13-1, and the connecting air hole 13-3 is switched between the communication and the disconnection with the air outlet of the positive pressure air pipe 13-2 when the first telescopic pipe 13-5 is telescopically arranged on the jet nozzle base 13-1 in a piston shape.

[0052] The above is only the preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application.

Claims

1. A precision controlled negative pressure precision seed metering device comprising a first housing (17), a second housing (5), a power input shaft (4) and a seed pick-up disc (15), characterized in that: The first shell (17) and the second shell (5) are buckled to form a cylindrical cavity, the power input shaft (4) passes through the cavity, the seed taking disc (15) is fixedly connected to the power input shaft (4) to divide the cavity into a seed cavity (8) and a negative pressure cavity (19), the seed taking disc (15) is provided with seed taking holes (2) arranged in a ring shape and taking the input shaft (4) as the center, the first shell (17) is provided with a negative pressure suction pipe (1), and the second shell (5) is provided with a seed inlet (3) and a seeding port (6); The seed taking disc (15) on the side of the negative pressure cavity (19) is provided with a seed feeding trigger mechanism (13), the seed feeding trigger mechanism (13) is arranged on the side of the negative pressure cavity (19) of the seed taking disc (15) relative to the seeding port (6), the seed feeding trigger mechanism (13) is one of a shielding wheel or a positive pressure air blowing nozzle, and a seed guide pipe (7) and a seed feeding pipe (12) are arranged after the seeding port (6); The shielding wheel is a rolling wheel, the wheel surface of the rolling wheel is in contact with the seed taking disc (15) and can rotate with the rotation of the seed taking disc (15), and the surface of the shielding wheel can shield at least one group of seed taking holes (2); The positive pressure air blowing nozzle comprises a positive pressure air pipe (13-2) and a jet nozzle base (13-1), the jet nozzle base (13-1) is provided with an air outlet, and the air outlet corresponds to the running track line of the seed taking hole (2) corresponding to the seeding port (6); The seed feeding trigger mechanism (13) is a positive pressure air blowing nozzle, the positive pressure air blowing nozzle is a trigger type air nozzle, the trigger type air nozzle comprises a positive pressure air pipe (13-2), a jet nozzle base (13-1) and an air outlet, a trigger mechanism is arranged at the air outlet, the trigger mechanism comprises a first telescopic pipe (13-5) and a second telescopic pipe (13-4) nested with each other, the first telescopic pipe (13-5) and the second telescopic pipe (13-4) are both hollow pipes, a second reset spring (13-9) and a limiting block (13-8) are arranged between the first telescopic pipe (13-5) and the second telescopic pipe (13-4), so that the first telescopic pipe (13-5) and the second telescopic pipe (13-4) can be telescopically displaced by a certain distance, an air guide hole (13-3) is arranged on the pipe wall of the front portion of the second telescopic pipe (13-4), a blocking block (13-10) is arranged at the end portion of the second telescopic pipe (13-4), the first telescopic pipe (13-5) is arranged in a piston shape on the jet nozzle base (13-1) and can be telescopically arranged on the jet nozzle base (13-1), a first reset spring (13-7) is arranged between the first telescopic pipe (13-5) and the jet nozzle base (13-1), and a rolling wheel (13-6) is arranged at the outer end portion of the first telescopic pipe (13-5); Or, the trigger type air nozzle comprises a positive pressure air pipe (13-2) and a jet nozzle base (13-1), and a trigger mechanism is arranged on the jet nozzle base (13-1), the trigger mechanism comprises a first telescopic pipe (13-5), the first telescopic pipe (13-5) is a hollow pipe, the first telescopic pipe (13-5) is arranged on the jet nozzle base (13-1) in a piston shape and can be telescoped on the jet nozzle base (13-1), a first reset spring (13-7) is arranged between the first telescopic pipe (13-5) and the jet nozzle base (13-1), a roller (13-6) is arranged on an outer end portion of the first telescopic pipe (13-5), an air inlet hole (13-3) is arranged on a pipe wall of a front portion of the first telescopic pipe (13-5), and an air outlet of the positive pressure air pipe (13-2) is a gas channel (13-11) corresponding to the air inlet hole (13-3) on the first telescopic pipe (13-5) on the jet nozzle base (13-1).

2. The precision controlled negative pressure precision seed metering device according to claim 1, characterized in that, The seed taking disc (15) on one side of the negative pressure cavity (19) is provided with a seed throwing trigger mechanism (13) and a seed cleaning mechanism (14) in sequence, the seed cleaning mechanism (14) comprises a wheel body, a plurality of seed cleaning teeth are arranged on the wheel body, the length of the seed cleaning teeth is greater than the thickness of the seed taking disc (15) and the seed cleaning teeth are engaged with the seed taking holes (2) on the seed taking disc (15) and pass through the seed taking holes (2) to drive the seed cleaning mechanism (14) to rotate.

3. The precision controlled negative pressure precision seed metering device according to claim 1 or 2, characterized in that At least one of a detection sensor (9), a seed throwing connecting pipe (10) and a connecting hose (11) is arranged between the seed guiding pipe (7) and the seed throwing pipe (12).

4. The precision controlled negative pressure precision seed metering device of claim 3, wherein, The seed throwing connecting pipe (10) or the connecting hose (11) is further provided with a negative pressure exhaust pipe (18).

5. A planter characterized by, The precision controlled negative pressure precision seed metering device is provided.

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