Seed metering mechanism and seeding machine

Abstract

The application provides a seed arranging mechanism and a seeding machine, and relates to the technical field of mechanical seeding. The seed arranging mechanism comprises a roller, an air pipe, an air needle and an air distribution disc. The roller is provided with a seed needle hole. The air pipe is arranged in the roller in a replaceable manner. The air needle is arranged on the air pipe in a replaceable manner and located in the seed needle hole. The air distribution disc is rotationally connected with the end of the roller, and the air distribution disc is provided with a negative pressure area and a positive pressure area. The roller is used for driving the air pipe to rotate. When the air pipe rotates to the negative pressure area, the air needle can adsorb seeds. When the air pipe rotates to the positive pressure area, the adsorbed seeds can be separated from the air needle. The seeding machine comprises the seed arranging mechanism. The seed arranging mechanism can adapt to the seed arranging of seeds with different shapes and particle sizes and quickly adjust the seed arranging spacing of the same seeds by replacing the air pipe or the air needle.

Description

Technical Field

[0001] This invention relates to the field of mechanical seeding technology, and in particular to a seed metering mechanism and a seeder. Background Technology

[0002] A roller seed metering device is a device that uses airflow to suck, carry, and dispense seeds. Because the air needles of the roller seed metering device are located inside the seed suction holes, it is suitable for adsorbing round seeds, but less effective at adsorbing irregularly shaped seeds. Furthermore, existing roller seed metering devices have a fixed spacing between seeds in the same row, which cannot quickly meet different seeding needs. Therefore, a seed metering device is needed that can adapt to the shape and particle size of the seeds to be adsorbed and can also quickly change the seed spacing. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a seed metering mechanism and a seeder.

[0004] This invention provides the following technical solution:

[0005] In a first aspect, the present invention provides a seed dispensing mechanism, including a roller, an air pipe, an air needle, and an air distribution plate; the roller has a seed needle hole; the air pipe is replaceably disposed inside the roller, and the air needle is replaceably disposed on the air pipe and located in the seed needle hole; the air distribution plate is rotatably connected to the end of the roller, and the air distribution plate is respectively provided with a negative pressure zone and a positive pressure zone; the roller is used to drive the air pipe to rotate, when the air pipe rotates to the negative pressure zone, the air needle can adsorb seeds; when the air pipe rotates to the positive pressure zone, the adsorbed seeds can detach from the air needle.

[0006] In one possible implementation, the seeding mechanism further includes a rotating shaft, a first end cap, and a second end cap; the first end cap and the second end cap are respectively disposed at both ends of the roller, and the first end cap is rotatably connected to the air distribution plate; the rotating shaft passes through the air distribution plate, the first end cap, and the second end cap; the air distribution plate is rotatably connected to the rotating shaft, the first end cap and the second end cap are respectively fixedly connected to the rotating shaft, and the first end cap and the second end cap are respectively fixedly connected to both ends of the air pipe.

[0007] In one possible implementation, the air distribution plate has a cavity, and the inner wall of the cavity has a negative pressure air groove and a positive pressure air groove respectively; the first end cap is rotatably disposed in the cavity.

[0008] In one possible implementation, the second end cap includes a cap body, a protrusion, a clip, and a limiting member; the protrusion is fixed to one side of the cap body, at least one of the clips is arranged circumferentially around the protrusion, and the end of the air tube away from the first end cap is fixed in the clip; the limiting member is detachably disposed on the cap body and corresponds to the clip; the side of the limiting member away from the cap body abuts against the end face of the end of the air tube away from the first end cap.

[0009] In one possible implementation, the limiting member is provided with a positioning block, and the clamp is provided with a mating groove that matches the positioning block; the positioning block is disposed in the mating groove.

[0010] In one possible implementation, the roller includes a first half-cylinder and a second half-cylinder connected to each other; both ends of the first half-cylinder and the second half-cylinder are provided with fixing holes, and both the first end cap and the second end cap are provided with locking holes corresponding to the fixing holes; the seeding mechanism further includes a locking member, which passes through the fixing hole and is fixed in the locking hole.

[0011] In one possible implementation, the air tube is provided with a fixing seat, the fixing seat is provided with a hollow connecting post, the surface of the connecting post is provided with an external thread, the air needle is provided with a connecting groove, and the inner wall of the connecting groove is provided with an internal thread corresponding to the external thread; the connecting post and the connecting groove are connected by a threaded engagement.

[0012] In one possible implementation, the seeding mechanism further includes a sealing ring, which is fitted onto the air needle and seals the opening of the seed needle hole.

[0013] In one possible implementation, the first half-cylinder includes a body and a cover plate, the body having at least one mounting groove corresponding to the air pipe; the cover plate is detachably disposed in the mounting groove; and the pinhole is disposed on the cover plate.

[0014] Secondly, the present invention also provides a seeder, which includes a seed box, a seed cleaning mechanism, and the aforementioned seed dispensing mechanism.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The seed metering mechanism provided in this application allows operators to replace air needles of corresponding lengths on the air tube according to the shape and size of the seeds. When replacing with shorter air needles, the needles are positioned within the seed needle holes on the roller. When the air tube is connected to the negative pressure zone in the air distribution plate, the seed needle hole can adsorb the seeds at its opening. When the air tube is connected to the positive pressure zone in the air distribution plate, the adsorbed seeds can detach from the opening of the seed needle hole. When replacing with longer air needles, the needles extend beyond the opening of the seed needle hole. When the air tube is connected to the negative pressure zone in the air distribution plate, the seeds are adsorbed onto the needles. When the air tube is connected to the positive pressure zone in the air distribution plate, the adsorbed seeds can detach from the needles. By replacing different air tubes, the spacing of the air needles on the air tubes can be adjusted, thereby quickly adjusting the seed metering spacing of the same row of seeds. The seed metering mechanism provided by this invention, by replacing different air needles, can change the way seeds are adsorbed to adapt to the metering of seeds of different shapes.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 An exploded view of a seed metering mechanism according to an embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram of the seed metering mechanism according to an embodiment of the present invention is shown;

[0021] Figure 3 A schematic diagram of the structure of the valve plate according to an embodiment of the present invention is shown;

[0022] Figure 4 A schematic diagram of the structure of the first end cap according to an embodiment of the present invention is shown;

[0023] Figure 5 A schematic diagram of the air needle and trachea in one embodiment of the present invention is shown;

[0024] Figure 6 An exploded view of a roller according to an embodiment of the present invention is shown;

[0025] Figure 7 This shows a structural schematic diagram of the second end cap from a first perspective according to an embodiment of the present invention;

[0026] Figure 8 This shows a structural schematic diagram of the second end cap from a second perspective according to an embodiment of the present invention;

[0027] Figure 9 A schematic diagram of the structure of the clip and limiting member according to an embodiment of the present invention is shown;

[0028] Figure 10 A partially exploded schematic diagram of a seed metering mechanism according to another embodiment of the present invention is shown;

[0029] Figure 11 A schematic diagram of a seeder according to an embodiment of the present invention is shown.

[0030] Explanation of key component symbols:

[0031] 100-Seed metering mechanism; 110-Roller; 111-First half-cylinder; 112-Second half-cylinder; 113-Seed needle hole; 114-Fixing hole; 115-Cover plate; 116-Mounting groove; 120-Rotating shaft; 121-Adjusting thread; 130-Fixing bracket; 140-Air distribution plate; 141-Cavity; 142-Negative pressure air groove; 143-Negative pressure hole; 144-Positive pressure air groove; 145-First connecting hole; 150-First end cap; 151-First mounting hole; 152-Positioning groove; 153- Second connecting hole; 160-Air pipe; 161-Fixed seat; 162-Air needle; 163-Positioning component; 164-Sealing ring; 170-Second end cap; 171-Cover body; 172-Protrusion; 173-Clip; 1731-Matching groove; 174-Limiting component; 1741-Positioning block; 175-Mounting assembly; 180-Adjusting component; 181-Mounting plate; 190-Elastic component; 191-Fixed component; 192-Bearing; 200-Seed box; 300-Seed cleaning mechanism; 1000-Seeder. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] Example 1

[0038] Please see Figures 1 to 6 One embodiment of the present invention provides a seed metering mechanism 100. The seed metering mechanism 100 is used for seed metering.

[0039] The seed dispensing mechanism 100 includes a roller 110, an air pipe 160, an air needle 162, and an air distribution plate 140; the roller 110 has a seed needle hole 113; the air pipe 160 is disposed inside the roller 110, and the air needle 162 is replaceably disposed on the air pipe 160 and located in the seed needle hole 113; the air distribution plate 140 is rotatably connected to the end of the roller 110, and the air distribution plate 140 is provided with a negative pressure zone and a positive pressure zone respectively.

[0040] The roller 110 is used to drive the air tube 160 to rotate so that when the air tube 160 is connected to the negative pressure zone, the air needle 162 can adsorb seeds; when the air tube 160 is connected to the positive pressure zone, the adsorbed seeds can detach from the air needle 162 or detach from the seed needle hole 113.

[0041] In some embodiments, please refer to Figure 1 and Figure 2 The seeding mechanism 100 further includes a first end cap 150, a second end cap 170, and a rotating shaft 120; the first end cap 150 and the second end cap 170 are respectively fixed to both ends of the roller 110, and the first end cap 150 is rotatably connected to the air distribution plate 140; the rotating shaft 120 passes through the air distribution plate 140, the first end cap 150, and the second end cap 170, and the air distribution plate 140 is rotatably connected to the rotating shaft 120; the first end cap 150 and the second end cap 170 are respectively connected to both ends of the rotating shaft 120; the first end cap 150 and the second end cap 170 are respectively connected to both ends of the air pipe 160.

[0042] The rotating shaft 120 is used to simultaneously drive the first end cap 150 and the second end cap 170 to rotate, thereby driving the roller 110 and the air tube 160 to rotate coaxially; the first end cap 150 is used to connect the air tube 160 with the chamber in the air distribution plate 140; when the air tube 160 is connected to the negative pressure zone, the air tube 160 is in a negative pressure state, and the seeds can be adsorbed onto the air needle 162 or the opening of the seed needle hole 113 provided by the air needle 162; as the roller 110 and the air tube 160 rotate, when the air tube 160 is connected to the positive pressure zone, the air tube 160 is in a positive pressure state, and the adsorbed seeds can fall off from the corresponding position.

[0043] For details, please refer to Figure 3The gas distribution plate 140 has a cavity 141 for accommodating the first end cap 150. The inner wall of the cavity 141 has a negative pressure gas groove 142 and a positive pressure gas groove 144. The negative pressure gas groove 142 is used to extract gas from the gas pipe 160 to create a negative pressure state inside the gas pipe 160. The positive pressure gas groove 144 is used to inject gas into the gas pipe 160 to change the negative pressure state inside the gas pipe 160 to a positive pressure state.

[0044] The negative pressure zone of the air distribution plate 140 is the area where the negative pressure air groove 142 is located, and the positive pressure zone of the air distribution plate 140 is the area where the positive pressure air groove 144 is located.

[0045] The cavity 141 is opened in the axial direction of the air distribution plate 140.

[0046] Preferably, the negative pressure air groove 142 is an arc-shaped groove, and the opening direction of the negative pressure air groove 142 on the inner wall of the cavity 141 is the axial direction of the air distribution plate 140.

[0047] The inner wall of the negative pressure gas groove 142 is provided with a negative pressure hole 143, which is used to connect the negative pressure gas groove 142 and the negative pressure pipe (not shown in the figure); when the negative pressure gas groove 142 is connected to the air pipe 160, the negative pressure pipe can draw gas from the air pipe 160 through the negative pressure gas groove 142.

[0048] Preferably, a plurality of negative pressure holes 143 are provided on the inner wall of the negative pressure air groove 142. The plurality of negative pressure holes 143 are arranged along the circumference of the air distribution plate 140, and each negative pressure hole 143 corresponds to a negative pressure pipe to ensure that the air pressure in the negative pressure air groove 142 is uniform.

[0049] The seeding mechanism 100 also includes an air pump (not shown), which is connected to the negative pressure pipe.

[0050] The positive pressure gas groove 144 is used to connect the cavity 141 and the positive pressure pipe (not shown); the positive pressure pipe can inject gas into the cavity 141 through the positive pressure gas groove 144.

[0051] In some embodiments, the positive pressure air groove 144 is a circular hole, and the diameter of the circular hole corresponds to the diameter of the air pipe 160. In other embodiments, the positive pressure air groove 144 may also be an arc-shaped groove to increase the communication time between the air pipe 160 and the positive pressure air groove 144, thereby ensuring that the seeds fall off smoothly.

[0052] Combination Figure 1As shown, the air distribution plate 140 is also provided with a first connecting hole 145, which is located at the center of the air distribution plate 140; the rotating shaft 120 passes through the first connecting hole 145, and the rotating shaft 120 is clearance-fitted with the inner wall of the first connecting hole 145 so that the rotating shaft 120 can rotate within the first connecting hole 145.

[0053] In some embodiments, please refer to Figures 1 to 4 The first end cap 150 is fixed to one end of the roller 110 and is rotatably disposed in the cavity 141. The first end cap 150 is provided with a first mounting hole 151 corresponding to the positive pressure air groove 144 or the negative pressure air groove 142. The first mounting hole 151 is used to fix one end of the air pipe 160 to the first end cap 150 so that the air pipe 160 can communicate with the positive pressure air groove 144 or the negative pressure air groove 142 when it rotates.

[0054] Preferably, the seed metering mechanism 100 includes multiple air pipes 160, and the first end cap 150 has multiple first mounting holes 151 corresponding to the number of air pipes 160; the multiple first mounting holes 151 are evenly arranged along the circumference of the first end cap 150. The arrangement of multiple air pipes 160 can significantly improve the seed metering efficiency of the seed metering mechanism 100.

[0055] Specifically, the first end cap 150 has a stepped portion inside, and one end of the air tube 160 abuts against the stepped portion to limit the axial movement of the air tube 160.

[0056] The first end cap 150 is also provided with a second connecting hole 153, which is located at the center of the first end cap 150. The rotating shaft 120 is press-fitted with the inner wall of the second connecting hole 153, thereby fixing the rotating shaft 120 to the first end cap 150.

[0057] In some embodiments, the second end cap 170 is fixed to the side of the roller 110 away from the first end cap 150. The second end cap 170 has a second mounting hole (not shown) for fixing the end of the air tube 160 away from the first end cap 150. The number of the second mounting holes corresponds to the number of the first mounting holes 151.

[0058] The second end cap 170 is also provided with a third connecting hole (not shown in the figure). The third connecting hole is located at the center of the first end cap 150, and the rotating shaft 120 is interference-fitted with the inner wall of the third connecting hole.

[0059] Please see Figure 5The air tube 160 is provided with a fixing seat 161, and the air needle 162 is replaceably provided on the fixing seat 161.

[0060] In some embodiments, the fixing base 161 is fixed to the air pipe 160 by welding. The fixing base 161 is provided with a hollow connecting post, the surface of which is provided with external threads. The air needle 162 is provided with a connecting groove, and the inner wall of the connecting groove is provided with internal threads corresponding to the external threads. The connecting post and the connecting groove are threadedly engaged, so that the air needle 162 can be replacedly mounted on the fixing base 161. The connecting post communicates with the threaded hole.

[0061] Preferably, the air tube 160 is provided with a plurality of fixing seats 161, and the plurality of fixing seats 161 are spaced apart along the axial direction of the air tube 160. Each fixing seat 161 corresponds to one air needle 162, and the number of needle holes 113 on the roller 110 corresponds to the number of air needles 162.

[0062] In other embodiments, the connecting post can be pluggably disposed in the connecting groove, or the air needle 162 can be replaceably disposed on the fixing base 161.

[0063] In some embodiments, when the seed metering mechanism 100 needs to meter round seeds, the operator can replace the air needle 162 with a smaller model so that the nozzle of the air needle 162 does not protrude from the opening of the seed needle hole 113. The nozzle of the air needle 162 can draw gas from the seed needle hole 113, creating a negative pressure state inside the seed needle hole 113, thereby allowing the seeds to be adsorbed at the opening of the seed needle hole 113. Compared to directly drawing gas from the seed needle hole 113, the method of drawing gas from the seed needle hole 113 using the air needle 162 results in a more concentrated airflow, effectively reducing adsorption energy consumption.

[0064] In other embodiments, when the seed metering mechanism 100 needs to meter flat or elongated irregularly shaped seeds, the operator can replace the air needle 162 with a larger model so that the air nozzle of the air needle 162 extends out of the seed needle hole 113. The air nozzle of the air needle 162 can reach into the seed pile to find and adsorb the seeds. Moreover, the air hole of the air needle 162 is small when adsorbing the seeds, and the airflow is concentrated, which reduces adsorption energy consumption and also reduces the void rate and reseeding rate.

[0065] The distance from the nozzle of the air needle 162 extending out of the seed needle hole 113 is between 3 and 8 mm; preferably, when the distance from the nozzle of the air needle 162 extending out of the seed needle hole 113 is 5 mm, the air needle 162 can easily adsorb the seeds in the seed pile, while the seeds are less likely to rub against the outer wall of the roller 110, thus facilitating the setting of a seed cleaning mechanism 300 on the outside of the roller 110 to remove excess seeds and reduce the reseeding rate.

[0066] Furthermore, when the air needle 162 extends out of the seed needle hole 113, the seed dispensing mechanism 100 also includes a sealing ring 164, which is sleeved on the air needle 162 to block the opening of the seed needle hole 113 to prevent the seeds from entering the seed needle hole 113.

[0067] The sealing ring 164 can be either a rubber sealing ring or a silicone sealing ring.

[0068] Combination Figure 4 As shown, the end of the air tube 160 is provided with a positioning member 163, and the first end cap 150 is provided with a positioning groove 152, which communicates with the first mounting hole 151. The positioning member 163 cooperates with the positioning groove 152 to restrict the rotation of the air tube 160 in the first mounting hole 151, and when the air tube 160 is placed inside the roller 110, the axial direction of the air needle 162 can coincide with the axial direction of the corresponding needle hole 113.

[0069] Specifically, the positioning member 163 is fixed to the outer surface of the air pipe 160 by heat fusion and extends along the axial direction of the air pipe 160. The positioning groove 152 and the first mounting hole 151 are both opened in the axial direction of the air pipe 160 on the first end cap 150.

[0070] In some embodiments, please refer to Figure 1 and Figure 6 The roller 110 includes a first half-cylinder 111 and a second half-cylinder 112. The first half-cylinder 111 and the second half-cylinder 112 are combined to form a hollow cylindrical structure. The first half-cylinder 111 and the second half-cylinder 112 are both provided with the aforementioned pinholes 113.

[0071] Furthermore, both ends of the first half-cylinder 111 and the second half-cylinder 112 are provided with fixing holes 114, and the first end cap 150 and the second end cap 170 are provided with locking holes (not shown) corresponding to the fixing holes 114. The seeding mechanism 100 also includes a locking member (not shown), which passes through the fixing hole 114 and is disposed in the locking hole, so that the roller 110 is fixedly connected to the first end cap 150 and the second end cap 170.

[0072] Preferably, the locking element is a screw, which is threaded into the screw hole so that the locking element can be fixed in the screw hole after passing through the fixing hole 114, thereby fixing the roller 110 to the first end cover 150 and the second end cover 170.

[0073] The roller 110 structure formed by combining the first half-cylinder 111 and the second half-cylinder 112 can reduce the difficulty of disassembling the roller 110, thereby making it easier for operators to disassemble the roller 110 and replace the air needle 162.

[0074] In some embodiments, please refer to Figure 1 and Figure 2 The seeding mechanism 100 further includes a fixed bracket 130, a fixing member 191, an elastic member 190, and an adjusting member 180; the rotating shaft 120 passes sequentially through the fixed bracket 130, the air distribution plate 140, the first end cover 150, and the second end cover 170; the fixed bracket 130 is connected to the side of the air distribution plate 140 away from the roller 110 via the fixing member 191; the elastic member 190 is sleeved on the rotating shaft 120, and the two ends of the elastic member 190 abut against the fixed bracket 130 and the air distribution plate 140 respectively; the adjusting member 180 is movably disposed on the rotating shaft 120 and abuts against the side of the second end cover 170 away from the roller 110.

[0075] Preferably, the adjusting member 180 is a nut, and the rotating shaft 120 is provided with an adjusting thread 121 that cooperates with the nut. The adjusting member 180 and the adjusting thread 121 are threadedly engaged so that the adjusting member 180 is movably disposed on the rotating shaft 120.

[0076] Furthermore, the seeding mechanism 100 also includes a mounting plate 181, which is sleeved on the rotating shaft 120 and located between the second end cover 170 and the adjusting member 180. The mounting plate 181 is used to protect the second end cover 170 to prevent the adjustment from damaging the second end cover 170.

[0077] The seeding mechanism 100 also includes two bearings 192; the two ends of the rotating shaft 120 are respectively rotatably disposed in the corresponding bearings 192.

[0078] The seed metering mechanism 100 provided in this embodiment allows the operator to replace the air needles 162 of corresponding length on the air pipe 160 according to the shape of the seeds. When the length of the air needle 162 is short, the air needle 162 can be located in the seed needle hole 113 opened on the roller 110. When the air pipe 160 is connected to the negative pressure zone in the air distribution plate 140, the seed needle hole 113 can adsorb the seeds at the opening of the seed needle hole 113. When the air pipe 160 is connected to the positive pressure zone in the air distribution plate 140, the adsorbed seeds can fall out from the opening of the seed needle hole 113. When the length of the air needle 162 is relatively long, the air needle 162 can extend beyond the opening of the seed needle hole 113. When the air tube 160 is connected to the negative pressure zone within the air distribution plate 140, the seeds are adsorbed onto the air needle 162. When the air tube 160 is connected to the positive pressure zone within the air distribution plate 140, the adsorbed seeds can detach from the air needle 162. The seed dispensing mechanism 100 provided by this invention can change the way the seeds are adsorbed by replacing different air needles 162, thus adapting to the dispensing of seeds of different shapes.

[0079] Example 2

[0080] Please see Figures 1 to 10 This embodiment provides a seeding mechanism 100. The difference compared to Embodiment Two described above is that:

[0081] In some embodiments, please refer to Figure 7 The second end cap 170 includes a cap body 171, a protrusion 172, a clip 173, and a limiting member 174; the protrusion 172 is fixed to one side of the cap body 171, at least one clip 173 is arranged around the protrusion 172 in the circumference, and one end of the air tube 160 is fixed in the clip 173; the limiting member 174 is detachably provided on the cap body 171 and corresponds to the clip 173; the side of the limiting member 174 away from the cap body 171 abuts against the end of the air tube 160 away from the first end cap 150.

[0082] The first clip 173 is used to fix the air tube 160 so that when the second end cap 170 rotates, it drives the air tube 160 to rotate. The limiting member 174 is used to limit the axial displacement of the air tube 160.

[0083] In some embodiments, the protrusion 172 is integrally formed and fixedly connected to the cover 171. The protrusion 172 is hexagonal in shape; each edge of the protrusion 172 is provided with a clip 173 so that the second end cap 170 can be fixedly connected to multiple air tubes 160 at the same time.

[0084] In other embodiments, the protrusion 172 may also be a cuboid, pentagon, or other shapes.

[0085] Combination Figure 8 As shown, the second end cap 170 also includes a mounting component 175; the mounting component 175 is used to connect the limiting member 174 to the cover body 171 and adjust the distance between the limiting member 174 and the cover body 171.

[0086] The mounting assembly 175 includes a screw and a nut; one end of the screw passes through the cover 171 and is connected to the limiting member 174; at least one nut is located on the side of the cover 171 away from the limiting member 174 and is disposed on the screw, and the screw and the nut are connected by a threaded structure.

[0087] In some embodiments, one end of the screw is fixedly connected to the limiting member 174. When the air tube 160 needs to be replaced, the operator can loosen the nut so that the limiting member 174 gradually moves away from the end of the air tube 160, thereby facilitating the operator to remove the air tube 160 from the clamp 173.

[0088] In some embodiments, please refer to Figures 7 to 9 The limiting member 174 is provided with a positioning block 1741, and the clamp 173 is provided with a mating groove 1731 corresponding to the limiting block; when the limiting member 174 abuts against the end of the air tube 160, the positioning block 1741 is disposed in the mating groove 1731. The air tube 160 is disposed within the limiting space formed by the clamp 173 and the positioning block 1741.

[0089] The positioning block 1741 has a curved surface on one side that corresponds to the surface shape of the trachea 160.

[0090] In some embodiments, one end of the screw is fixedly connected to the threaded hole on the limiting member 174 by a threaded engagement. When the air tube 160 needs to be replaced, the operator can loosen the nut to allow the screw to unscrew from the threaded hole on the limiting member 174, thereby separating the limiting member 174 from the cover 171, making it easier for the operator to remove the air tube 160 from the clamp 173.

[0091] In some embodiments, please refer to Figure 10The first half-cylinder 111 includes a body and a cover plate 115. The body has at least one mounting groove 116, which corresponds to the air pipe 160. The cover plate 115 is detachably disposed in the mounting groove 116. The pinhole is disposed on the cover plate 115.

[0092] In some embodiments, the cover plate 115 is provided with a buckle, and the body is provided with a slot corresponding to the buckle. The buckle cooperates with the slot so that the cover plate 115 is detachably mounted on the body and covers the mounting groove 116.

[0093] The number of mounting slots 116 corresponds to the number of air pipes.

[0094] The mounting groove 116 extends on the cover plate 115 in a direction parallel to the axial direction of the air pipe 160.

[0095] The structure of the second half-cylinder 112 is the same as that of the first half-cylinder 111.

[0096] When it is necessary to replace the air needles 162 of different sizes, or to replace the air tubes 160 with different spacing between the air needles 162, the operator can remove the cover plate 115 corresponding to the air tube 160 from the main body to expose the air tube 160; this facilitates the replacement of the air tube 160 or the air needles 162 on the air tube 160, allowing the seed metering mechanism 100 to quickly adapt to different seed metering requirements.

[0097] The above-described method of replacing the air needle 162 or the air tube 160 does not require removing the second end cap 170 from the roller 110, thereby effectively reducing the replacement time and improving replacement efficiency.

[0098] Example 3

[0099] Please see Figures 1 to 11 The present invention also provides a seeder 1000, which includes a seed box 200, a seed cleaning mechanism 300, and the aforementioned seed dispensing mechanism 100; the seed box 200 is used to store seeds; the seed dispensing mechanism 100 is used to adsorb the seeds from the seed box 200 and to precisely dispense the adsorbed seeds; the seed cleaning mechanism 300 is used to remove excess seeds adsorbed by the seed dispensing mechanism 100, so as to reduce the reseeding rate when the seeder 1000 is sowing.

[0100] The seed cleaning mechanism 300 is located outside the roller 110; the seed cleaning mechanism 300 includes at least one set of seed cleaning pipes, and the seed cleaning pipes are connected to an external air supply system.

[0101] The seed cleaning tube includes a tube body, an air supply needle 162, a threaded rotating needle, a seed-picking needle, and a quick-connect connector. Multiple threaded needles are distributed on one side of the circumference of the tube body, and a quick-connect connector is provided on the other side. Each threaded rotating needle corresponds to one air supply needle 162 and one seed-picking needle. The threaded rotating needle, air supply needle 162, and seed-picking needle are connected sequentially. The quick-connect connector is externally connected to an air supply system. The air supply system is connected to a positive pressure air source via a pipeline.

[0102] The seed-dispensing needle has a cylindrical structure; there is a clearance fit between the seed-dispensing needle and the inner hole of the air supply needle 162, allowing the seed-dispensing needle to reciprocate within the inner hole of the air supply needle 162. During operation, the seed-dispensing needle floats in contact with the surface of the roller 110 under the action of the airflow inside the air supply needle 162. Positive pressure airflow flows out through the gap between the air supply needle 162 and the seed-dispensing needle.

[0103] Normally, the seed needle hole 113 adsorbs more than one seed. When the seed needle hole 113 carrying the seed rotates to the area below the first seed cleaning tube, the seed-removing needle can collide with the seed group. At the moment of impact, the binding force between the seeds decreases, thereby separating some seeds from the seed group. The separated seeds can be blown back to the seed box 200 by the positive pressure airflow, thereby removing the excess seeds adsorbed on the roller 110.

[0104] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0105] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A seed metering mechanism, characterized in that, The seed sowing mechanism comprises a roller, an air tube, an air needle and an air distribution disc, a needle hole is formed in the roller, the air tube is arranged in the roller in a replaceable manner, the air needle is arranged on the air tube in a replaceable manner and located in the needle hole, the air distribution disc is rotationally connected with the end of the roller, and a negative pressure area and a positive pressure area are respectively arranged in the air distribution disc, the roller is used for driving the rotation of the air tube, the air needle can adsorb seeds when the air tube rotates to the negative pressure area, and the adsorbed seeds can be separated from the air needle when the air tube rotates to the positive pressure area; The seed sowing mechanism further comprises a rotating shaft, a first end cover and a second end cover, the first end cover and the second end cover are arranged at the two ends of the roller respectively, the first end cover is rotationally connected with the air distribution disc, the rotating shaft is arranged on the air distribution disc, the first end cover and the second end cover simultaneously, the air distribution disc is rotationally connected with the rotating shaft, the first end cover and the second end cover are fixedly connected with the rotating shaft respectively, and the first end cover and the second end cover are fixedly connected with the two ends of the air tube respectively; The second end cover comprises a cover body, a protruding block, a clamp and a limiting piece, the protruding block is fixed on one side of the cover body, at least one clamp is arranged around the protruding block in a circumferential direction, and one end of the air tube away from the first end cover is fixed in the clamp, the limiting piece is detachably arranged on the cover body and corresponds to the clamp, and one side of the limiting piece away from the cover body abuts against the end face of one end of the air tube away from the first end cover; A positioning block is arranged on the limiting piece, and a matching groove corresponding to the positioning block is formed in the clamp, when the limiting piece abuts against the end of the air tube, the positioning block is arranged in the matching groove, and the air tube is arranged in a limiting space surrounded by the clamp and the positioning block; The roller comprises a first half cylinder and a second half cylinder connected with each other, the two ends of the first half cylinder and the second half cylinder are provided with fixing holes, the first end cover and the second end cover are provided with locking holes corresponding to the fixing holes respectively, and the seed sowing mechanism further comprises a locking piece, the locking piece passes through the fixing hole and is fixed in the locking hole; The first half cylinder comprises a body and a cover plate, at least one mounting groove corresponding to the air tube is formed in the body, and the cover plate is detachably arranged in the mounting groove, the needle hole is arranged on the cover plate, and the second half cylinder has the same structure as the first half cylinder; According to the shape of the seeds, the air needle with a corresponding length can be replaced on the air tube; When the length of the air needle is short, the air needle can be located in the needle hole formed in the roller, so that the seeds can be adsorbed at the opening of the needle hole when the air tube communicates with the negative pressure area in the air distribution disc, and the adsorbed seeds can fall off from the opening of the needle hole when the air tube communicates with the positive pressure area in the air distribution disc. When the length of the air needle is longer, the air needle can extend out of the opening of the seed needle hole to adsorb the seed on the air needle when the air tube communicates with the negative pressure area in the air distribution disc, and the adsorbed seed can fall off from the air needle when the air tube communicates with the positive pressure area in the air distribution disc.

2. The seed meter of claim 1, wherein, The air distribution disc is provided with a cavity, and the inner wall of the cavity is respectively provided with a negative pressure air groove and a positive pressure air groove; the first end cover is rotatably arranged in the cavity.

3. The seed meter of claim 1, wherein, The air tube is provided with a fixing seat, the fixing seat is provided with a hollow connecting column, the surface of the connecting column is provided with an external thread, the air needle is provided with a connecting groove, and the inner wall of the connecting groove is provided with an internal thread corresponding to the external thread; the connecting column and the connecting groove are connected through thread cooperation.

4. The seed meter of claim 3, wherein, The seed discharge mechanism further comprises a sealing ring, the sealing ring is sleeved on the air needle, and the opening of the seed needle hole is blocked.

5. The seed meter of claim 4, wherein, The first half cylinder comprises a body and a cover plate, at least one mounting groove is formed in the body, and the mounting groove corresponds to the air tube; the cover plate is detachably arranged in the mounting groove; and the seed needle hole is arranged on the cover plate.

6. A planter characterized by, The seed discharge mechanism comprises a seed box, a seed cleaning mechanism and the seed discharge mechanism according to any one of claims 1-5.

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