Single-grain multi-grain variable air-suction electric drive seed meter

Abstract

The application belongs to the technical field of agricultural machinery, and provides a single-grain and multi-grain variable air-suction electric-drive seed sowing device, which comprises a seed cavity shell, an air chamber shell fixedly connected with the seed cavity shell, a seed sowing disc rotatably connected in the air chamber shell, and a seed storage cavity and a seed falling cavity formed by the side of the seed sowing disc close to the seed cavity shell and the seed cavity shell. A plurality of hole type assembly are arranged on the side wall of the seed sowing disc at equal intervals. A negative pressure assembly is arranged in the air chamber shell and corresponds to the plurality of hole type assemblies in the seed storage cavity. A hole sealing plate assembly is also arranged in the air chamber shell and corresponds to the plurality of hole type assemblies in the seed storage cavity. A seed unloading wheel assembly is also arranged in the air chamber shell and is used for pushing out the seeds blocked on the hole type assemblies in the seed falling cavity. The hole type blocking cleaning and the quick switching function of the sowing mode are reasonably integrated in the seed sowing device.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery technology, and in particular relates to a single-grain or multi-grain variable air-suction electric drive seed metering device. Background Technology

[0002] Precision seeding is a crucial technological step in achieving high crop yields and efficiency. Among these techniques, the air-suction seed metering device is widely used due to its advantages such as good adaptability to seed shape and size and low seed damage rate. Its working principle mainly relies on the negative pressure on one side of the seed metering disc to adsorb the seeds. When the seeds rotate with the seed metering disc to the seed unloading area, the negative pressure disappears, allowing the seeds to fall precisely into the seed furrow.

[0003] However, existing air-suction seed metering devices still have the following technical challenges in practical applications: First, there is the problem of clogging of the seed stalks. During operation, seeds often become stuck in the stalks due to variations in seed size, impurities, or humidity, preventing them from falling out smoothly. This causes the stalks to become ineffective in subsequent cycles, failing to absorb new seeds, directly leading to uneven planting spacing, missed sowing, and affecting sowing accuracy and uniformity.

[0004] Secondly, to adapt to different crops or agronomic requirements, existing technologies have developed variable seed metering devices that alter the effective number of adsorption holes on the seed metering disc. However, these designs increase structural complexity, leading to conflicts in spatial layout and motion logic between the sealing mechanism used to change the aeration state of the seed holes and the mechanical seed unloading mechanism used to resolve seed hole blockage. This makes it difficult to integrate them into a single compact seed metering device. Consequently, the seed metering device cannot simultaneously possess both the crucial functions of "reliable anti-clogging" and "single / multiple seed variable" capabilities. Summary of the Invention

[0005] The purpose of this invention is to provide a single- or multi-seed variable air-suction electric-driven seed metering device to solve the above-mentioned problems and achieve the purpose of effectively integrating hole clogging cleaning and rapid switching of seeding modes.

[0006] To achieve the above objectives, the present invention provides the following solution: a single-grain / multi-grain variable air-suction electric drive seed metering device, comprising:

[0007] A seed cavity shell, wherein a baffle is vertically fixedly connected inside the seed cavity shell, and the top of the baffle is fixedly connected to the bottom inner side of the seed cavity shell;

[0008] An air chamber shell is fixedly connected to the seed cavity shell. A seed metering disc is rotatably connected inside the air chamber shell. A rotation drive is provided between the seed metering disc and the air chamber shell. The side of the seed metering disc near the seed cavity shell, together with the baffle and the seed cavity shell, forms a seed storage cavity and a seed dropping cavity. Multiple perforation assemblies are evenly spaced on the side wall of the seed metering disc. A negative pressure assembly is provided inside the air chamber shell. The negative pressure assembly is correspondingly arranged with the multiple perforation assemblies located in the seed storage cavity. A sealing plate assembly is also provided inside the air chamber shell. The sealing plate assembly is correspondingly arranged with the multiple perforation assemblies located in the seed storage cavity and is used to change the number of perforations for ventilation. A seed unloading wheel assembly is also provided inside the air chamber shell. The seed unloading wheel assembly is used to push out seeds that are blocked on the perforation assemblies located in the seed dropping cavity.

[0009] Preferably, the perforation assembly includes a boss fixedly connected to the seed metering disc near the side wall of the seed chamber housing. The boss has three sets of perforations, which are arranged along the axis of the seed metering disc and are equally spaced around the axis of the boss on the end face of the boss. The two ends of the perforations are respectively connected to the seed chamber housing and the air chamber housing.

[0010] Preferably, the negative pressure assembly includes a sealing ring fixedly connected to the inner wall of the air chamber housing. The side of the sealing ring away from the air chamber housing is slidably sealed to the side of the seed dispensing disc away from the seed cavity housing. The shaped hole located inside the sealing ring is also located in the seed storage cavity, and the shaped hole located outside the sealing ring is also located in the seed dropping cavity. The air chamber housing is also provided with a negative pressure introduction mechanism communicating with the sealing ring.

[0011] Preferably, the negative pressure introduction mechanism includes a negative pressure cavity fixedly connected to the air chamber housing, one end of the negative pressure cavity is connected to a negative pressure interface, the negative pressure interface is used to connect to an external negative pressure device, an air port is opened in the air chamber housing, one end of the air port is connected to the negative pressure cavity, and the other end of the air port is located inside the sealing ring.

[0012] Preferably, the sealing plate assembly includes a connecting block fixedly connected to the side wall of the air chamber housing away from the seed cavity housing. A push rod is slidably connected within the connecting block along the axis of the seed metering disc. One end of the push rod passes through the air chamber housing and is fixedly connected to a first arc-shaped baffle. One side of the first arc-shaped baffle is correspondingly arranged with multiple shaped hole assemblies located in the seed storage cavity. A second arc-shaped baffle is retractably connected to the side wall of the first arc-shaped baffle near the seed metering disc. When the second arc-shaped baffle is in contact with the seed metering disc, one of the shaped holes in the multiple shaped hole assemblies is blocked. When the first arc-shaped baffle is in contact with the seed metering disc, two of the shaped holes in the multiple shaped hole assemblies are blocked simultaneously.

[0013] Preferably, the connecting block has a vertical through hole, and a pin is detachably connected to the through hole. The push rod has three sets of insertion holes. When one of the insertion holes is aligned with the through hole, the pin passes through the through hole and the insertion hole.

[0014] Preferably, the seed unloading wheel assembly includes a seed unloading roller rotatably connected within the air chamber housing. The seed unloading roller is correspondingly arranged with a set of shaped hole assemblies located in the seed dropping chamber, and the rotation axis of the seed unloading roller coincides with one diameter of the seed metering disc. The seed unloading roller is in contact with the side of the seed metering disc away from the seed chamber housing and rotates under the drive of the seed metering disc. A plurality of push rods are fixedly connected to the seed unloading roller, and three sets of push rods are inserted into three sets of shaped holes in a shaped hole assembly to push out seeds blocked in the shaped holes.

[0015] Preferably, the end of the top rod away from the seed unloading roller is tapered.

[0016] Preferably, the top of the baffle is located inside the circle containing the plurality of the shaped hole assemblies.

[0017] Preferably, the top of the seed chamber shell is provided with a feed inlet, which is correspondingly provided with the seed storage chamber, and the bottom of the seed chamber shell is connected with a discharge pipe, which is connected with the seed dropping chamber.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] 1. This invention, by setting a seed unloading wheel assembly located in the seed dropping chamber and rotating synchronously with the seed metering disc, forcibly pushes out seeds that may be stuck in the seed holes when the seeds arrive at the seed dropping area, fundamentally avoiding the problem of continuous missed sowing caused by the blockage of the seed holes, and ensuring the accuracy and stability of the sowing quantity.

[0020] 2. This invention creatively designs a sealing plate assembly that is spatially offset from and functionally independent of the seed unloading wheel assembly. Through the air control plate assembly, the number of ventilation holes in the perforation assembly located in the seed storage chamber is precisely controlled. This allows for adjustment of the number of seeds carried per batch without changing parameters such as the seed metering disc shape and rotation speed, thus achieving regulation of the sowing quantity. Simultaneously, it does not spatially interfere with the seed unloading wheel assembly located tangentially, enabling the perfect coexistence of the two major functions of "reliable seed unloading" and "variable mode" in the same compact model.

[0021] 3. The invention has a reasonable overall layout and can be easily switched between modes. It is easy to operate and has a fixed state, making it suitable for complex field conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the seed metering device of the present invention;

[0024] Figure 2 This is another schematic diagram of the seed metering device of the present invention;

[0025] Figure 3 This is a cross-sectional schematic diagram of the seed cavity shell of the present invention;

[0026] Figure 4 This is a schematic diagram of the air chamber housing of the present invention;

[0027] Figure 5 This is a schematic diagram of the sealing plate assembly of the present invention;

[0028] Figure 6 This is a schematic diagram showing the positions of the seed metering disc and the sealing plate assembly of the present invention;

[0029] Figure 7 This is a schematic diagram of the electronic control adjustment module in Embodiment 2 of the present invention;

[0030] The components are as follows: 1. Seed chamber shell; 2. Air chamber shell; 3. Discharge pipe; 4. Inlet; 5. Motor; 6. Seed metering disc; 7. Gearbox; 8. Negative pressure chamber; 9. Negative pressure interface; 10. Baffle; 11. Sealing ring; 12. Sealing plate assembly; 13. Seed unloading roller; 14. Push rod; 15. Connecting plate; 16. Air port; 17. Connecting block; 18. Pin; 19. Insertion hole; 20. Gear ring; 21. Connecting shell; 22. Lead screw; 23. Fixing block; 24. Servo motor; 25. Position sensor; 101. Seed storage chamber; 102. Seed dropping chamber; 601. Boss; 602. Hole; 1201. First arc-shaped baffle; 1202. Second arc-shaped baffle; 1203. Spring; 1204. Push rod. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1:

[0034] Reference Figures 1-6 This invention provides a single-grain or multi-grain variable air-suction electric drive seed metering device, comprising:

[0035] Seed cavity shell 1, a baffle 10 is vertically fixedly connected inside the seed cavity shell 1, and the top of the baffle 10 is fixedly connected to the bottom inner side of the seed cavity shell 1;

[0036] The air chamber shell 2 is fixedly connected to the seed cavity shell 1. A seed dispensing disc 6 is rotatably connected inside the air chamber shell 2. A rotation drive is provided between the seed dispensing disc 6 and the air chamber shell 2. The side of the seed dispensing disc 6 near the seed cavity shell 1, together with the baffle 10 and the seed cavity shell 1, forms a seed storage cavity 101 and a seed dropping cavity 102. Multiple perforation assemblies are evenly spaced on the side wall of the seed dispensing disc 6. A negative pressure assembly is provided inside the air chamber shell 2. The negative pressure assembly is correspondingly arranged with the multiple perforation assemblies located in the seed storage cavity 101. A sealing plate assembly 12 is also provided inside the air chamber shell 2. The sealing plate assembly 12 is correspondingly arranged with the multiple perforation assemblies located in the seed storage cavity 101 and is used to change the number of perforations for ventilation. A seed unloading wheel assembly is also provided inside the air chamber shell 2. The seed unloading wheel assembly is used to push out the seeds blocked on the perforation assemblies located in the seed dropping cavity 102.

[0037] The main function of the baffle 10 is to divide the inside of the seed chamber shell 1 into a seed storage chamber 101 and a seed dropping chamber 102, thus completing the functional zoning. The main function of the rotating drive is to drive the seed metering disc 6 to rotate. The main function of the perforation assembly is to adsorb the seeds in the seed storage chamber 101 under the action of the negative pressure assembly. The main function of the sealing plate assembly 12 is to change the number of ventilated perforations in some perforation assemblies located in the seed storage chamber 101, thereby changing the number of seeds that move with the seed metering disc 6 to the seed dropping chamber 102. The main function of the seed unloading wheel assembly is to push out the seeds in the perforations of the perforation assembly that have moved to the seed dropping chamber 102, ensuring a stable seed sowing quantity and avoiding the situation where seeds are stuck in the perforations for a long time. Overall, this invention creatively designs a sealing plate assembly that is spatially offset from the seed unloading wheel assembly and functionally independent. By precisely controlling the number of ventilated perforations in the perforation assembly located in the seed storage chamber through the air control plate assembly, the number of seeds adsorbed and carried each time can be adjusted without changing the shape and rotation speed of the seed metering disc, thereby achieving the regulation of the sowing quantity. At the same time, it does not interfere with the seed unloading wheel assembly located in the tangential direction in space, so that the two major functions of "reliable seed unloading" and "variable mode" can coexist perfectly in the same compact model.

[0038] The scheme is further optimized. The hole assembly includes a boss 601 fixedly connected to the side wall of the seed metering disc 6 near the seed chamber shell 1. The boss 601 has three sets of holes 602. The three sets of holes 602 are arranged along the axis of the seed metering disc 6, and the three sets of holes 602 are equally spaced around the axis of the boss 601 on the end face of the boss 601. The two ends of the holes 602 are respectively connected to the seed chamber shell 1 and the air chamber shell 2.

[0039] like Figure 3 As shown, in this embodiment, the line connecting the three sets of holes 602 on the end face of the boss 601 forms an equilateral triangle shape, and the arrangement of the three sets of holes 602 on the multiple bosses 601 on the seed metering disc 6 is such that the three sets of holes 602 on one set of bosses 601 are arranged in a circular array along the axis of the seed metering disc 6, so that one set of holes 602 on multiple bosses 601 is on the same outermost circle, another set of holes 602 is on the same middle circle, and the third set of holes 602 is on the innermost circle, so as to ensure that the sealing plate assembly 12 acts evenly on the corresponding hole assembly, and to ensure the stability of the seed suction and seed dropping operation.

[0040] Further optimization of the scheme: the negative pressure component includes a sealing ring 11 fixedly connected to the inner wall of the air chamber housing 2. The side of the sealing ring 11 away from the air chamber housing 2 is slidably sealed to the side of the seed dispensing tray 6 away from the seed cavity housing 1. The shaped hole 602 located inside the sealing ring 11 is also located in the seed storage cavity 101, and the shaped hole 602 located outside the sealing ring 11 is also located in the seed dropping cavity 102. The air chamber housing 2 is also provided with a negative pressure introduction mechanism that communicates with the sealing ring 11.

[0041] The scheme is further optimized. The negative pressure introduction mechanism includes a negative pressure chamber 8 fixedly connected to the air chamber housing 2. One end of the negative pressure chamber 8 is connected to a negative pressure interface 9. The negative pressure interface 9 is used to connect to an external negative pressure device. An air port 16 is opened in the air chamber housing 2. One end of the air port 16 is connected to the negative pressure chamber 8, and the other end of the air port 16 is located in the sealing ring 11.

[0042] like Figure 2 and Figure 4 As shown, in this embodiment, the sealing ring 11 is annular in shape, and its bottom end covers the bottom of the seed chamber housing 1, ensuring that the seeds temporarily stored in the seed storage chamber 101 can be adsorbed onto the perforation 602 at the bottom. Its other end covers the upper middle part of the right side of the seed metering tray 6, ensuring that the negative pressure adsorbing the seeds can disappear when the seeds rotate with the seed metering tray 6 to the seed dropping chamber 102, ensuring that the seeds fall smoothly. At the same time, one side of the sealing ring 11 is fixedly connected to the inner wall of the air chamber housing 2, and the other side is tightly fitted to the seed metering tray 6 to achieve a sliding sealing connection.

[0043] During operation, the external negative pressure device creates a negative pressure state inside the sealing ring 11 through the negative pressure chamber 8 and the air port 16, which allows the pore 602 inside the sealing ring 11 to adsorb seeds, causing the seeds to gradually move into the seed dropping chamber 102 as the seed dispensing disc 6 rotates.

[0044] In a further optimized design, the sealing plate assembly 12 includes a connecting block 17 fixedly connected to the side wall of the air chamber housing 2 away from the seed chamber housing 1. A push rod 1204 is slidably connected inside the connecting block 17 along the axis of the seed metering disc 6. One end of the push rod 1204 passes through the air chamber housing 2 and is fixedly connected to a first arc-shaped baffle 1201. One side of the first arc-shaped baffle 1201 is correspondingly set with multiple hole-shaped components located in the seed storage chamber 101. A second arc-shaped baffle 1202 is telescopically connected to the side wall of the first arc-shaped baffle 1201 near the seed metering disc 6. When the second arc-shaped baffle 1202 is in contact with the seed metering disc 6, one hole 602 of the multiple hole-shaped components is blocked. When the first arc-shaped baffle 1201 is in contact with the seed metering disc 6, two holes 602 of the multiple hole-shaped components are blocked simultaneously.

[0045] The design is further optimized by providing a through hole in the connecting block 17, with a pin 18 detachably connected inside the through hole. The push rod 1204 has three sets of insertion holes 19 vertically. When one insertion hole 19 is aligned with the through hole, the pin 18 passes through both the through hole and the insertion hole 19.

[0046] like Figure 2 , Figures 4-6 As shown, in this embodiment, one end of the first arc-shaped baffle 1201 and the second arc-shaped baffle 1202 are located inside the seed storage cavity 101 and near the right end of the seed dispensing tray 6. This ensures that when the orifice 602 contacts the first arc-shaped baffle 1201 or the second arc-shaped baffle 1202, the seeds can fall into the seed storage cavity 101 after losing their adsorption force, and will not fall into the seed dispensing cavity 102. At the same time, the other end of the first arc-shaped baffle 1201 and the second arc-shaped baffle 1202 extends to the right side of the sealing ring 11, ensuring that the orifice 602 is in a stable blocked state before it moves out of the sealing ring 11. That is, the blocked orifice 602 is always blocked, and the orifice with seeds adsorbed always adsorbs seeds, ensuring that the pressure inside the sealing ring 11 is stable, avoiding fluctuations, and ensuring the reliability of seed adsorption.

[0047] In a further optimized design, an arc-shaped groove is provided on the first arc-shaped baffle 1201, and the second arc-shaped baffle 1202 is slidably connected in the arc-shaped groove. Multiple springs 1203 abut against the arc-shaped groove and the second arc-shaped baffle 1202.

[0048] When it is necessary to adjust from sowing three seeds to sowing two seeds, the operator can pull out the pin 18 upwards and push the push rod 1204 inwards to align the middle insertion hole 19 with the through hole and insert the pin 18. At this time, the second arc-shaped baffle 1202 abuts against the shaped hole 602 located on the outermost circle and blocks it. At this time, only the two sets of shaped holes 602 are ventilated and can adsorb two seeds.

[0049] When adjusting to sowing one seed, the operator can pull out the pin 18 upwards and continue to push the push rod 1204 inwards, so that the outermost insertion hole 19 is aligned with the through hole and the pin 18 is inserted. At this time, the second arc-shaped baffle 1202 abuts against the shaped hole 602 located on the outermost circle, blocking it. At the same time, the first arc-shaped baffle 1201 abuts against the shaped hole 602 located on the middle circle, blocking it. At this time, only one set of shaped holes 602 is open for air, which can adsorb one seed.

[0050] Further optimization of the scheme: the rotating drive component includes a gear ring 20 fixedly sleeved on the side of the seed metering disc 6 and a gearbox 7 fixedly connected to the air chamber housing 2. The output gear of the gearbox 7 meshes with the gear ring 20, and the input gear of the gearbox 7 is driven by a motor 5, which is fixedly connected to the housing of the gearbox 7.

[0051] In a further optimized design, the seed unloading wheel assembly includes a seed unloading roller 13 rotatably connected within the air chamber housing 2. The seed unloading roller 13 is correspondingly positioned to a set of orifice assemblies located in the seed dropping chamber 102, and the axis of rotation of the seed unloading roller 13 coincides with a radial line of the seed metering disc 6. The seed unloading roller 13 is in contact with the side of the seed metering disc 6 furthest from the seed chamber housing 1 and rotates under the drive of the seed metering disc 6. Multiple push rods 14 are fixedly connected to the seed unloading roller 13. The multiple push rods 14 are positioned on the seed unloading roller 13 according to the positional relationship of the orifices 602, ensuring that three sets of push rods 14 are inserted into the three sets of orifices 602 in one orifice assembly each time, used to push out seeds blocked in the orifices 602. In this embodiment, the top of the push rod 14 is truncated cone-shaped to ensure that its end can be smoothly inserted into the orifice 602.

[0052] The scheme was further optimized so that the seed unloading roller 13 was connected to the air chamber shell 2 via the connecting plate 15.

[0053] like Figure 3 , Figure 4 As shown, with the rotation of the seed metering disc 6, when it moves to the far right of the sealing ring 11, the negative pressure inside the orifice 602 is lost. At this time, the seeds fall into the seed dropping chamber 102 under the action of gravity, realizing seed sowing. To prevent seeds from getting stuck in the orifice 602, as the seed metering disc 6 rotates, the seed unloading roller 13 rotates accordingly, inserting its three sets of push rods 14 into the three sets of orifices 602 to push out the seeds stuck there.

[0054] The design was further optimized by adjusting the diameter of the seed unloading roller 13 and its position on the seed metering plate 6 so that the push rod 14 on the seed unloading roller 13 can be inserted into the holes 602 in each boss 601 each time.

[0055] The design was further optimized by making the end of the top rod 14 away from the seed unloading roller 13 tapered.

[0056] The main purpose of the tapered design is to allow the push rod 14 to be smoothly inserted into the hole 602 by reducing the diameter of the end.

[0057] In a further optimized design, the top of the baffle 10 is located inside the circle containing the multiple hole components.

[0058] like Figure 3 As shown, the baffle 10 separates the seed storage chamber 101 and the seed dropping chamber 102, preventing the seeds in the seed storage chamber 101 from entering the seed dropping chamber 102, and allowing them to move to the seed dropping chamber 102 only with the seed metering tray 6.

[0059] To further optimize the design, a feed inlet 4 is provided at the top of the seed chamber shell 1, which corresponds to the seed storage chamber 101. A discharge pipe 3 is connected to the bottom of the seed chamber shell 1, and the discharge pipe 3 is connected to the seed dropping chamber 102.

[0060] Example 2:

[0061] The only difference between this embodiment and Embodiment 1 is that the sealing plate assembly 12 includes a connecting housing 21 fixedly connected to the side wall of the air chamber housing 2 away from the seed chamber housing 1, a push rod 1204 slidably connected inside the connecting housing 21, and an electronic control adjustment module is provided between the connecting housing 21 and the push rod 1204.

[0062] The electronic control adjustment module includes a lead screw 22 rotatably connected in the connecting housing 21. The lead screw 22 is arranged parallel to the push rod 1204. A servo motor 24 is fixedly connected in the connecting housing 21. The output shaft of the servo motor 24 is coaxially fixedly connected to one end of the lead screw 22. A fixing block 23 is fixedly connected on the push rod 1204. The fixing block 23 is located in the connecting housing 21 and is threaded onto the lead screw 22.

[0063] A further optimized solution includes a position sensor 25, which is fixedly connected to the fixing block 23. The position sensor 25 is used to monitor the change in distance between the fixing block 23 and the side wall of the connecting housing 21. In this embodiment, an optocoupler sensor can be used as the position sensor.

[0064] Further optimization of the design includes a control module electrically connected to the servo motor 24 and position sensor 25. The control module features a touchscreen for convenient control of the servo motor 24 and display of the push rod 1204's position. In this embodiment, the control module can be integrated into the traction device for user convenience.

[0065] like Figure 7 As shown, when it is necessary to adjust from sowing three seeds to sowing two seeds, the user can select the "double seed" mode through the operation screen. At this time, the control module controls the servo motor 24 to drive the lead screw 22 to rotate, which pushes the fixed block 23 through the threaded transmission, and then pushes the push rod 1204 to move to the left by a set distance. At this time, the second arc-shaped baffle 1202 abuts against the hole 602 located on the outermost circle and blocks it. At this time, only the two sets of holes 602 are ventilated, which can adsorb two seeds. During the process, the position sensor 25 feeds back the real-time position of the push rod 1204 to achieve closed-loop control.

[0066] When the setting is adjusted to sow a single seed, the user can select the "single seed" mode through the operation screen. At this time, the control module controls the servo motor 24 to drive the lead screw 22 to rotate, which pushes the fixed block 23 through the threaded transmission, and then pushes the push rod 1204 to continue to move to the left by a set distance. At this time, the second arc-shaped baffle 1202 abuts against the hole 602 located on the outermost circle and blocks it. At the same time, the first arc-shaped baffle 1201 abuts against the hole 602 located on the middle circle and blocks it. At this time, only one set of holes 602 can be ventilated, which can adsorb a single seed.

[0067] Similarly, when the user selects the "three seeds" mode through the operation screen, the control module controls the servo motor 24 to rotate in the opposite direction, and drives the push rod 1204 to move to the rightmost end through the fixed block 23, so that the first arc-shaped baffle 1201 and the second arc-shaped baffle 1202 are separated from the shaped hole 602. At this time, all the shaped holes 602 are ventilated and can adsorb three seeds.

[0068] In this embodiment, the electronic control adjustment module is used to realize the electronic control adjustment of the seed metering device of the present invention, which is beneficial to improving the intelligence level of the seed metering device.

[0069] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0070] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A single-grain / multi-grain variable air-suction electric drive seed metering device, characterized in that, include: Seed cavity shell (1), a baffle (10) is vertically fixedly connected inside the seed cavity shell (1), and the top of the baffle (10) is fixedly connected to the bottom of the inner side of the seed cavity shell (1); An air chamber shell (2) is fixedly connected to the seed cavity shell (1). A seed metering disc (6) is rotatably connected inside the air chamber shell (2). A rotation drive is provided between the seed metering disc (6) and the air chamber shell (2). The side of the seed metering disc (6) near the seed cavity shell (1) is surrounded by the baffle (10) and the seed cavity shell (1) to form a seed storage cavity (101) and a seed dropping cavity (102). Multiple perforated components are evenly spaced on the side wall of the seed metering disc (6). Inside the air chamber shell (2) A negative pressure component is provided, which is correspondingly arranged with multiple pore components located in the seed storage chamber (101). A sealing plate component (12) is also provided in the air chamber shell (2), which is correspondingly arranged with multiple pore components located in the seed storage chamber (101) to change the number of pores for ventilation. A seed unloading wheel component is also provided in the air chamber shell (2), which is used to push out the seeds blocked on the pore components located in the seed dropping chamber (102). The shaped hole assembly includes a boss (601) fixedly connected to the side wall of the seed metering disc (6) near the seed chamber housing (1). The boss (601) has three sets of shaped holes (602). The three sets of shaped holes (602) are arranged along the axis of the seed metering disc (6), and the three sets of shaped holes (602) are equally spaced around the axis of the boss (601) on the end face of the boss (601). The two ends of the shaped holes (602) are respectively connected to the seed chamber housing (1) and the air chamber housing (2). The seed unloading wheel assembly includes a seed unloading roller (13) rotatably connected in the air chamber housing (2). The seed unloading roller (13) is correspondingly arranged with a set of shaped hole assemblies located in the seed dropping chamber (102). The rotation axis of the seed unloading roller (13) coincides with one diameter of the seed metering disc (6). The seed unloading roller (13) is in contact with the side of the seed metering disc (6) away from the seed chamber housing (1). It rotates under the drive of the seed metering disc (6). A plurality of push rods (14) are fixedly connected to the seed unloading roller (13). Three sets of push rods (14) are inserted into three sets of shaped holes (602) in a shaped hole assembly to push out the seeds blocked in the shaped holes (602).

2. The single-grain / multi-grain variable air-suction electric-driven seed metering device according to claim 1, characterized in that: The negative pressure assembly includes a sealing ring (11) fixedly connected to the inner wall of the air chamber housing (2). The side of the sealing ring (11) away from the air chamber housing (2) is slidably sealed to the side of the seed dispensing disc (6) away from the seed cavity housing (1). The hole (602) located inside the sealing ring (11) is also located in the seed storage cavity (101), and the hole (602) located outside the sealing ring (11) is also located in the seed dropping cavity (102). The air chamber housing (2) is also provided with a negative pressure introduction mechanism that communicates with the sealing ring (11).

3. The single-grain / multi-grain variable air-suction electric drive seed metering device according to claim 2, characterized in that: The negative pressure introduction mechanism includes a negative pressure cavity (8) fixedly connected to the air chamber housing (2). One end of the negative pressure cavity (8) is connected to a negative pressure interface (9). The negative pressure interface (9) is used to connect to an external negative pressure device. An air port (16) is opened in the air chamber housing (2). One end of the air port (16) is connected to the negative pressure cavity (8), and the other end of the air port (16) is located in the sealing ring (11).

4. The single-grain / multi-grain variable air-suction electric drive seed metering device according to claim 1, characterized in that: The sealing plate assembly (12) includes a connecting block (17) fixedly connected to the side wall of the air chamber shell (2) away from the seed chamber shell (1). A push rod (1204) is slidably connected inside the connecting block (17) along the axis of the seed dispensing disc (6). One end of the push rod (1204) passes through the air chamber shell (2) and is fixedly connected to a first arc-shaped baffle (1201). One side of the first arc-shaped baffle (1201) is connected to a plurality of seed storage chambers (1) The hole assembly in 01) is correspondingly configured. The first arc-shaped baffle (1201) is retractably connected to the side wall of the seed metering disc (6). When the second arc-shaped baffle (1202) is in contact with the seed metering disc (6), one hole (602) in the multiple hole assemblies is blocked. When the first arc-shaped baffle (1201) is in contact with the seed metering disc (6), two holes (602) in the multiple hole assemblies are blocked at the same time.

5. A single-grain / multi-grain variable air-suction electric-driven seed metering device according to claim 4, characterized in that: The connecting block (17) has a vertical through hole, and a pin (18) is detachably connected in the through hole. The push rod (1204) has three sets of insertion holes (19) vertically. When one of the insertion holes (19) is aligned with the through hole, the pin (18) passes through the through hole and the insertion hole (19).

6. A single-grain / multi-grain variable air-suction electric-driven seed metering device according to claim 1, characterized in that: The end of the top rod (14) away from the seed unloading roller (13) is tapered.

7. A single-grain / multi-grain variable air-suction electric drive seed metering device according to claim 1, characterized in that: The top of the baffle (10) is located inside the circle containing the plurality of the hole assemblies.

8. A single-grain / multi-grain variable air-suction electric-driven seed metering device according to claim 1, characterized in that: The top of the seed chamber shell (1) is provided with a feed inlet (4), which is corresponding to the seed storage chamber (101). The bottom of the seed chamber shell (1) is connected to a discharge pipe (3), which is connected to the seed dropping chamber (102).

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