Precision seeding machine for plug seedling

Abstract

The application discloses a plug seedling precision seeder, and belongs to the technical field of plug seedling seeders, which comprises a conveying belt; a feeding shell is arranged above the conveying belt, and the feeding shell is provided with a containing cavity; a feeding roller is arranged in the containing cavity, and the feeding roller is provided with an air suction space and an air suction hole in communication with the air suction space; sealing assemblies are rotatably arranged at the two ends of the feeding roller in the axial direction, and the free ends of the two sealing assemblies are connected with the inner wall of the containing cavity; a suction device is in communication with the air suction space through the sealing assemblies, and the suction device works to suck the air in the air suction space, so that the air suction hole adsorbs seeds. According to the seeder designed in the application, the sealing performance of the feeding roller is good, the adsorption force of each air suction hole is guaranteed, the specified number of seeds is adsorbed by each air suction hole, the power of the suction device can be reduced, the energy consumption of the seeder is reduced, and the cost of plug seedling work is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of tray seedling raising and seeding machines, and in particular relates to a tray seedling raising and precision seeding machine. Background Art

[0002] In the related art, vegetables occupy an important position in people's daily dietary structure. Vegetable seedling cultivation is an important basis for achieving early maturity and high yield of vegetables. Plug tray seedling cultivation is an important means of modern facility agriculture. Plug tray seedling cultivation can improve the efficiency and quality of seedling cultivation, thereby improving the yield and quality of vegetables. In the existing art, the plug tray seedling seeder includes a pneumatic drum seeder. However, since the drum and the air pump are connected and the drum rotates relative to the air pump, the sealing between the drum and the air pump is poor, and the adsorption force of the suction holes on the drum cannot be guaranteed, and thus the consistency of the number of seeds in the multiple holes on the plug tray cannot be guaranteed (it is difficult to achieve precision sowing), and it will cause the air pump power to increase, resulting in high energy consumption of the seeder, and thus increase the cost of plug tray sowing. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, one object of the present invention is to provide a precision seeder for growing seedlings in trays.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention provides a precision seeder for plug seedlings, comprising: a conveyor belt, which is suitable for conveying plug trays; a feeding shell, which is arranged above the conveyor belt, and the feeding shell is provided with a accommodating cavity open toward the conveyor belt; a feeding roller, which is arranged in the accommodating cavity, an air suction space is provided in the feeding roller, and the outer peripheral wall of the feeding roller is provided with an air suction hole connected with the air suction space; a storage box, which is arranged above the feeding roller, and the storage box is provided with a discharge port, which is suitable for contacting the outer peripheral wall of the feeding roller; a sealing assembly, which is rotatably arranged at both ends of the feeding roller in the axial direction, and the free ends of the two sealing assemblies are respectively connected to the inner wall of the accommodating cavity; a suction device, which is suitable for being connected to the sealing assembly, and the suction device is connected with the suction space through the sealing assembly, and the suction device works to suck the air in the suction space, so that the suction hole adsorbs the seeds in the storage box.

[0006] According to the precision seeder for seedlings in the plug tray of the present invention, the feeding drum has good sealing performance, which can ensure the adsorption force of each suction hole, so that each suction port can adsorb a specified number of seeds, ensuring the consistency of the number of seeds in multiple holes on the plug tray. Of course, due to the good sealing performance of the feeding drum, the power of the suction device can be reduced, thereby reducing the energy consumption of the seeder and reducing the cost of plug tray sowing.

[0007] Furthermore, the sealing assembly includes: a bearing, the bearing is provided with a first rotating ring and a second rotating ring that can rotate relative to each other, the first rotating ring is sleeved on the outer circumference of the second rotating ring, and the first rotating ring is connected to the side wall of the feeding roller; a hollow connecting shaft, one end of the hollow connecting shaft is connected to the inner wall of the accommodating cavity, and one end of the hollow connecting shaft is connected to the suction device, the other end of the hollow connecting shaft is connected to the second rotating ring, and the second rotating ring extends into the suction space.

[0008] Furthermore, a baffle is provided on the outer peripheral wall of the other end of the hollow connecting shaft, a sealing portion extending toward the bearing is provided on the outer peripheral edge of the baffle, and a sealing groove suitable for accommodating the sealing portion is provided on the side wall of the feeding roller.

[0009] Furthermore, the sealing part includes: a clamping block, which extends toward the sealing groove; a sealing ring, which is arranged in the sealing groove and can rotate relative to the sealing groove, and the sealing ring is provided with a clamping groove toward the baffle, and the clamping groove is suitable for accommodating the clamping block.

[0010] Furthermore, the sealing groove includes: a first groove section, which extends in the axial direction and one end of which is connected to the intake space; a second groove section, which extends radially toward the hollow connecting shaft and is connected to the other end of the first groove section; wherein the sealing ring is accommodated in both the first groove section and the second groove section.

[0011] Furthermore, the sealing ring includes: a first sealing ring, which is arranged in the first groove section and is provided with the clamping groove; and a second sealing ring, which is arranged in the second groove section and is connected to the first sealing ring.

[0012] Furthermore, a first air passage is provided in the hollow connecting shaft, one end of the first air passage is connected to the hollow connecting shaft, the other end of the first air passage extends to the free end of the clamping block, a second air passage is provided in the clamping groove opposite to the first air passage, an expansion chamber is provided in the second sealing ring, and the expansion chamber is connected to the first air passage through the second air passage.

[0013] Further, the first air passage comprises: a first passage section, one end of the first passage section is in communication with the hollow connecting shaft, the other end of the first passage section extends in a direction away from the baffle; a second passage section, one end of the second passage section is in communication with the other end of the first passage section, the other end of the second passage section extends towards the baffle; a third passage section, the third passage section is formed in the baffle, one end of the third passage section is in communication with the other end of the second passage section; a fourth passage section, the fourth passage section is formed in the clamping block, one end of the fourth passage section is in communication with the other end of the third passage section, the other end of the fourth passage section is opposite to the second air passage.

[0014] Further, the air suction hole is provided with a chamfer at both ends in the axial direction.

[0015] Further, the outer peripheral wall of the feeding roller is provided with a plurality of air suction holes, and the plurality of air suction holes are distributed at intervals in the axial direction.

[0016] Other advantages, objects, and features of the application will be set forth in the following specification and will be apparent to those skilled in the art from the following specification and the attached drawings. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the objects, technical solutions and beneficial effects of the present application clearer, the present application provides the following drawings for description:

[0018] Figure 1 is a schematic view of the seeding machine of the present application;

[0019] Figure 2 is a schematic view of the cooperation between the feeding roller and the sealing assembly of the present application;

[0020] Figure 3 is a sectional view of the cooperation between the feeding roller and the sealing assembly of the present application;

[0021] Figure 4 is Figure 3 is an enlarged view of the middle circle A;

[0022] Figure 5 is a schematic view of the sealing ring of the present application;

[0023] Figure 6 is a schematic view of the cooperation between the feeding roller and the storage box of the present application.

[0024] The signs in the drawings are as follows:

[0025] 1. Seeder;

[0026] 10. Conveyor belt;

[0027] 20. Feeding shell;

[0028] 30. Feeding roller; 31. Suction space; 32. Suction hole;

[0029] 40. Storage box;

[0030] 51. Bearing; 511. First rotating ring; 512. Second rotating ring; 52. Hollow connecting shaft; 521. First channel section; 522. Second channel section; 53. Baffle; 531. Third channel section; 54. Snap-fit ​​block; 541. Fourth channel section; 55. Sealing ring; 551. First sealing ring; 5511. Second air passage; 5512. Snap-fit ​​groove; 552. Second sealing ring; 5521. Expansion chamber;

[0031] 60. Material loading and base installation device; 70. Hole pressing device; 80. Base covering device. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other instances, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0034] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] Example 1:

[0037] like Figures 1-6 As shown, the present invention provides a precision seeding machine 1 for growing seedlings in a tray, comprising: a conveyor belt 10, a feeding shell 20, a feeding roller 30, a storage box 40, a sealing assembly and a suction device. The conveyor belt 10 is suitable for conveying the tray, the feeding shell 20 is arranged above the conveyor belt 10, the feeding shell 20 is provided with a receiving cavity open to the conveyor belt 10, the feeding roller 30 is arranged in the receiving cavity, the feeding roller 30 is provided with an air suction space 31, and the outer peripheral wall of the feeding roller 30 is provided with an air suction hole 3 connected to the air suction space 31. 2. The storage box 40 is arranged above the feeding drum 30. The storage box 40 is provided with a discharge port, which is suitable for contacting the outer peripheral wall of the feeding drum 30. The sealing assembly is rotatably arranged at both ends of the feeding drum 30 in the axial direction. The free ends of the two sealing assemblies are respectively connected to the inner wall of the accommodating cavity. The suction device is suitable for being connected to the sealing assembly, and the suction device is connected to the suction space 31 through the sealing assembly. The suction device works to suck the air in the suction space 31, so that the suction hole 32 absorbs the seeds in the storage box 40.

[0038] In some embodiments, the seeder 1 also includes a loading and base-loading device 60, a hole-pressing device 70 and a base-covering device 80. The loading and base-loading device 60, the hole-pressing device 70 and the base-covering device 80 are all arranged above the conveyor belt 10, and in the conveying direction of the conveyor belt 10, the loading and base-loading device 60, the hole-pressing device 70, the feeding shell 20 and the base-covering device 80 are distributed in sequence. When the hole tray is transported on the conveyor belt 10, the loading and base-loading device 60 first puts the foundation onto the hole tray (the foundation can be nutrient soil, etc., which is not limited here), and then the hole-pressing device 70 is suitable for pressing a hole on the foundation, and the hole is suitable for accommodating seeds. Then, the feeding roller 30 puts the seeds in the storage box 40 into the hole, and finally the base-covering device 80 puts the foundation again to bury the seeds.

[0039] Specifically, a driving device and a detection device are also provided in the feeding shell 20. The driving device is suitable for driving the feeding roller 30 to rotate, and the detection device is suitable for detecting the position of the seeds on the feeding roller 30 and the position of the hole tray. The detection device is electrically connected to the driving device and the suction device. Therefore, when the hole tray moves to the bottom of the feeding shell 20, the detection device controls the suction device and the driving device to work. The suction device works to suck the gas in the suction space 31, so that the pressure state in the suction space 31 is negative pressure, and then the suction holes 32 can absorb the seeds at the discharge port. Then the driving device works to drive the feeding roller 30 to rotate. When the feeding roller 30 rotates to the point where the seeds are facing the holes on the hole tray in the height direction, the suction device stops working, and the seeds fall into the holes under the action of gravity.

[0040] It is understood that the feeding housing 20 is disposed above the conveyor belt 10, and a receiving chamber open toward the conveyor belt 10 is formed within the feeding housing 20. The receiving chamber is suitable for accommodating the feeding roller 30, the storage box 40, the sealing assembly, the suction device, etc. The feeding housing 20 is suitable for isolating the feeding roller 30, the storage box 40, the sealing assembly, the suction device, etc. from the external environment, thereby achieving the function of protecting the feeding roller 30, the storage box 40, the sealing assembly, the suction device, etc. The feeding roller 30 is located within the receiving chamber of the feeding housing 20, and an air suction space 31 is provided inside the feeding roller 30. An air suction hole 32 communicating with the air suction space 31 is provided on the outer peripheral wall of the feeding roller 30. When the suction device is in operation, the air in the air suction space 31 is extracted, forming a negative pressure, so that the air suction hole 32 can absorb the seeds in the storage box 40. The storage box 40 is located above the feeding drum 30. The discharge port of the storage box 40 contacts the outer peripheral wall of the feeding drum 30, ensuring that the seeds can be smoothly absorbed by the suction holes 32. Sealing assemblies are installed at both ends of the feeding drum 30. The sealing assemblies can ensure the sealing of the suction space 31 and prevent air leakage. The free end of the sealing assembly is connected to the inner wall of the feeding housing 20, allowing the feeding drum 30 to rotate within the accommodating chamber. The suction device is connected to the suction space 31 within the feeding drum 30 through the sealing assembly. When the suction device is in operation, the air in the suction space 31 is extracted, forming a negative pressure, which enables the suction holes 32 to absorb the seeds in the storage box 40.

[0041] It is worth mentioning that the sealing assembly is rotatably connected to the side wall of the feeding roller 30. The sealing assembly can ensure the sealing of the suction space 31 when the feeding roller 30 rotates relative to the sealing assembly. Since the suction device is connected to the suction space 31 through the sealing assembly, and the free end of the sealing assembly is fixed, the suction device will not rotate with the feeding roller 30, which facilitates the connection between the suction device and the sealing assembly and makes the sealing at the connection between the suction device and the sealing assembly better.

[0042] When the suction device is working, the feeding roller 30 can rotate relative to the suction device, and due to the good sealing of the suction space 31, the suction space 31 can only absorb air from the suction holes 32, ensuring the air absorption capacity of the suction holes 32, thereby ensuring the adsorption capacity of seeds. At the same time, due to the good sealing of the feeding roller 30, the adsorption force of each suction hole 32 can be guaranteed, so that each suction port can adsorb a specified number of seeds (the specified number of seeds can be 1, 2 or 3, etc., which is not limited here), ensuring the consistency of the number of seeds in multiple holes on the hole tray. Of course, due to the good sealing of the feeding roller 30, the power of the suction device can be reduced, thereby reducing the energy consumption of the seeder 1 and reducing the cost of hole tray sowing.

[0043] It is worth noting that, through the negative pressure generated by the suction device, the suction holes 32 can accurately absorb the seeds in the storage box 40, ensuring that each suction hole 32 only absorbs one seed, thereby improving the single-grain rate of sowing. Moreover, the coordinated work of the conveyor belt 10 and the feeding roller 30 realizes a continuous sowing process and improves the sowing efficiency. Of course, by controlling the operation of the driving device and the suction device through the detection device, the rotation of the feeding roller 30 can be accurately controlled to ensure that each hole on each hole plate can accurately receive the seeds.

[0044] Example 2:

[0045] Based on the first embodiment, the sealing assembly of this embodiment includes: a bearing 51 and a hollow connecting shaft 52. The bearing 51 is provided with a first rotating ring 511 and a second rotating ring 512 that can rotate relative to each other. The first rotating ring 511 is sleeved on the outer periphery of the second rotating ring 512. The first rotating ring 511 is connected to the side wall of the feeding roller 30. One end of the hollow connecting shaft 52 is connected to the inner wall of the accommodating cavity, and one end of the hollow connecting shaft 52 is communicated with the suction device. The other end of the hollow connecting shaft 52 is connected to the second rotating ring 512, and the second rotating ring 512 extends into the suction space 31.

[0046] In some embodiments, the bearing 51 is composed of a first rotating ring 511 and a second rotating ring 512. The first rotating ring 511 is sleeved on the outer circumference of the second rotating ring 512. The first rotating ring 511 is connected to the side wall of the feeding roller 30. The inner circumferential wall of the second rotating ring 512 is connected to the hollow connecting shaft 52. The hollow connecting shaft 52 passes through the side wall of the feeding roller 30 and extends into the suction space 31. A sealing rubber ring is provided at the connection between the hollow connecting shaft 52 and the side wall of the feeding roller 1 to ensure the sealing effect of the connection between the feeding roller 30 and the hollow connecting shaft 52 when the feeding roller 30 rotates relative to the hollow connecting shaft 52.

[0047] Therefore, through the above arrangement, the feeding roller 30 can maintain good sealing performance during rotation, preventing air from leaking from both ends of the feeding roller 30. The relative rotation between the first rotating ring 511 and the second rotating ring 512 ensures the free rotation of the feeding roller 30 while maintaining the sealing performance. The hollow connecting shaft 52 not only serves as a connection, but also connects the suction device to the suction space 31 through the internal air channel, ensuring that the negative pressure can be transmitted to the suction holes 32 to achieve seed adsorption.

[0048] That is, the relative rotation design of the first rotating ring 511 and the second rotating ring 512 ensures the sealing performance of the feeding roller 30 during rotation, preventing air from leaking from both ends of the feeding roller 30. Moreover, the design of the hollow connecting shaft 52 ensures the connection of the suction device to the suction space 31, which can maintain stable negative pressure even when the feeding roller 1 is rotating, thereby improving the sealing effect.

[0049] Of course, the design of the sealing assembly reduces air leakage, so that the suction device does not need to generate higher negative pressure to overcome the leakage, thereby reducing the power requirement of the suction device. The reduction of suction device power directly leads to the reduction of overall energy consumption of the seeding machine 1, improving the energy utilization efficiency of the seeding machine 1. At the same time, the improvement of the sealing assembly ensures the stability of the negative pressure in the suction space 31, so that the suction holes 32 can more accurately adsorb seeds, reducing the hole rate and multiple rate of the holes in the plug, and improving the seeding precision.

[0050] Embodiment Three:

[0051] In this embodiment, the outer peripheral wall of the other end of the hollow connecting shaft 52 is provided with a baffle 53, the outer peripheral edge of the baffle 53 is provided with a sealing part extending towards the bearing 51, and the side wall of the feeding roller 30 is provided with a sealing groove suitable for accommodating the sealing part.

[0052] In some embodiments, the baffle 53 is arranged on the outer peripheral wall of the other end of the hollow connecting shaft 52. Therefore, the projection of the connection between the hollow connecting shaft 52 and the side wall of the feeding roller 30 in the axial direction is located in the baffle 53. The baffle 53 can form a seal for the connection between the hollow connecting shaft 52 and the side wall of the feeding roller 30, thereby improving the sealing effect of the suction space 31.

[0053] The sealing part is arranged on the outer peripheral edge of the baffle 53 and extends towards the bearing 51. The sealing groove is arranged on the side wall of the feeding roller 30 and is suitable for accommodating the sealing part. The sealing groove is a groove that matches the shape of the sealing part, ensuring that the sealing part can be tightly embedded. That is, the cooperation between the sealing groove and the sealing part forms a double seal, further enhancing the sealing effect of the suction space 31.

[0054] Therefore, the design of the baffle 53, the sealing part and the sealing groove makes the sealing of the air suction space 31 better, greatly reduces the possibility of air leakage, ensures the stability of the negative pressure in the air suction space 31, and ensures the suction force of each air suction hole 32, so that the air suction hole 32 can more accurately suck the seeds, reduces the air hole rate and the multiple particle rate, and improves the seeding precision.

[0055] That is, the design of the baffle 53, the sealing part and the sealing groove on the side wall of the feeding roller 30 forms multiple sealing, further enhances the sealing effect of the sealing assembly, ensures the stability of the negative pressure in the air suction space 31, and thus realizes the high-precision and low-energy-consumption seeding process.

[0056] According to some embodiments of the present application, the sealing part comprises a clamping block 54 and a sealing ring 55, the clamping block 54 extends towards the sealing groove, the sealing ring 55 is arranged in the sealing groove, and the sealing ring 55 is rotatable relative to the sealing groove, the sealing ring 55 is provided with a clamping groove 5512 facing the baffle 53, and the clamping groove 5512 is adapted to accommodate the clamping block 54.

[0057] In some embodiments, the main function of the clamping block 54 is to cooperate with the clamping groove 5512 on the sealing ring 55 to ensure the stable connection between the sealing ring 55 and the baffle 53, and to ensure the structural stability of the sealing assembly. The sealing ring 55 is arranged in the sealing groove, the sealing ring 55 is a ring-shaped elastic component, and the sealing ring 55 is rotatable relative to the sealing groove. During the rotation of the sealing ring 55 relative to the sealing groove, the outer peripheral wall of the sealing ring 55 contacts and maintains the sealing with the inner peripheral wall of the sealing groove, thereby ensuring the sealing effect of the air suction space 31. It is worth mentioning that the elastic design of the sealing ring 55 enables the sealing ring 55 to adapt to slight deformation, ensuring good sealing under various working conditions. Through the above design, the possibility of air leakage is greatly reduced, the stability of the negative pressure in the air suction space 31 is ensured, and the suction and feeding precision of the seeds is improved.

[0058] It is worth mentioning that the outer peripheral wall of the sealing ring 55 rotates relative to the sealing groove, and thus the outer peripheral wall of the sealing ring 55 and the inner peripheral wall of the sealing groove are provided with lubricating oil, thereby reducing the friction of the sealing ring 55 relative to the sealing groove, and further reducing the wear of the sealing ring 55. Of course, since the sealing ring 55 is connected with the baffle 53 through the cooperation of the clamping groove 5512 and the clamping block 54, when the sealing ring 55 is excessively worn or damaged, the sealing ring 55 can be disassembled by only releasing the cooperation of the clamping groove 5512 and the clamping block 54, thereby facilitating the replacement of the sealing ring 55.

[0059] According to some embodiments of the present application, the sealing groove comprises: a first groove section extending in the axial direction, and one end of the first groove section being in communication with the air suction space 31; and a second groove section extending in the radial direction towards the hollow connecting shaft 52, and the second groove section being in communication with the other end of the first groove section; wherein the sealing ring 55 is accommodated in the first groove section and the second groove section.

[0060] In some embodiments, the first groove section extends in the axial direction, the second groove section extends in the radial direction towards the hollow connecting shaft 52, at least a part of the sealing ring 55 is accommodated in the first groove section, and the outer circumferential wall of the sealing ring 55 cooperates with the inner circumferential wall of the first groove section to form a radial seal; and at least another part of the sealing ring 55 is accommodated in the second groove section, and the outer circumferential wall of the sealing ring 55 cooperates with the inner circumferential wall of the second groove section to form an axial seal. Thus, the L-shaped design formed by the cooperation of the first groove section and the second groove section, and the cooperation of the first groove section and the second groove section with the sealing ring 55, forms a multi-level seal, ensures the sealing between the feeding roller 30 and the hollow connecting shaft 52, reduces air leakage, and thus ensures the stability of the negative pressure in the air suction space 31, and further realizes a high-precision and low-energy-consumption seeding process.

[0061] Thus, the L-shaped design formed by the cooperation of the first groove section and the second groove section, and the cooperation of the first groove section and the second groove section with the sealing ring 55, forms a multi-level seal, ensures the sealing between the feeding roller 30 and the hollow connecting shaft 52, reduces air leakage, and thus ensures the stability of the negative pressure in the air suction space 31, and further realizes a high-precision and low-energy-consumption seeding process.

[0062] According to some embodiments of the present application, the sealing ring 55 comprises: a first sealing ring 551 arranged in the first groove section and provided with a clamping groove 5512; and a second sealing ring 552 arranged in the second groove section and connected with the first sealing ring 551.

[0063] In some embodiments, the first sealing ring 551 is an annular elastic component arranged in the first groove section and provided with the clamping groove 5512, the cooperation of the clamping groove 5512 and the clamping block 54 ensures the stability of the connection between the baffle 53 and the first sealing ring 551, and the second sealing ring 552 is also an annular elastic component arranged in the second groove section and connected with the first sealing ring 551 (the first sealing ring 551 and the second sealing ring 552 are integrally injection molded), the second sealing ring 552 is stably connected with the baffle 53 through the first sealing ring 551, and the connection between the second sealing ring 552 and the first sealing ring 551 ensures the continuity and integrity of the sealing ring 55 in the first groove section and the second groove section, and further enhances the sealing effect.

[0064] It is worth noting that the outer peripheral wall of the first sealing ring 551 is suitable for cooperating with the inner peripheral wall of the first groove segment to form a radial seal, and the second sealing ring 552 cooperates with the inner peripheral wall of the second groove segment to form an axial seal. Therefore, the combined design of the first sealing ring 551 and the second sealing ring 552 forms a multi-level seal, ensuring the sealing between the feeding roller 30 and the hollow connecting shaft 52, thereby ensuring the stability of the negative pressure in the suction space 31.

[0065] Example 4:

[0066] In this embodiment, based on the third embodiment, a first air passage is provided in the hollow connecting shaft 52, one end of the first air passage is communicated with the hollow connecting shaft 52, the other end of the first air passage extends to the free end of the clamping block 54, a second air passage 5511 opposite to the first air passage is provided in the clamping groove 5512, an expansion chamber 5521 is provided in the second sealing ring 552, and the expansion chamber 5521 is communicated with the first air passage through the second air passage 5511.

[0067] According to some embodiments of the present invention, the first air passage includes: a first channel section 521, a second channel section 522, a third channel section 531 and a fourth channel section 541, one end of the first channel section 521 is connected to the hollow connecting shaft 52, and the other end of the first channel section 521 extends obliquely in a direction away from the baffle 53, one end of the second channel section 522 is connected to the other end of the first channel section 521, and the other end of the second channel section 522 extends toward the baffle 53, the third channel section 531 is formed in the baffle 53, one end of the third channel section 531 is connected to the other end of the second channel section 522, the fourth channel section 541 is formed in the clamping block 54, one end of the fourth channel section 541 is connected to the other end of the third channel section 531, and the other end of the fourth channel section 541 is directly opposite to the second air passage 5511.

[0068] In some embodiments, a first channel section 521 and a second channel section 522 are provided in the wall of the hollow connecting tube. The first channel section 521 extends obliquely in a direction away from the baffle 53, and the second channel section 522 extends in the axial direction of the hollow connecting shaft 52. The first channel section 521 is connected to the second channel section 522 and an arc-shaped first transition channel is formed between the first channel section 521 and the second channel section 522. The third channel section 531 is formed on the baffle 53 and extends in the radial direction of the baffle 53. The fourth channel section 531 is formed on the baffle 53 and extends in the radial direction of the baffle 53. Segment 541 is formed on the clamping block 54, a second arc-shaped transition channel is formed between the second channel segment 522 and the third channel segment 531, a third arc-shaped transition channel is formed between the third channel segment 531 and the fourth channel segment 541, the fourth channel segment 541 is opposite to the second air passage 5511, the second air passage 5511 is formed on the first sealing ring 55, and an expansion chamber 5521 is formed in the second sealing ring 55, and the expansion chamber 5521 is connected to the fourth channel segment 541 through the second air passage 5511.

[0069] When the suction device is working, the air in the suction space 31 flows from the side of the hollow connecting shaft 52 close to the baffle 53 to the suction device, and when the air flows in the hollow connecting shaft 52, a part of the air will pass through the first channel section 521, the first arc-shaped transition channel, the second channel section 522, the second arc-shaped transition channel, the third channel section 531, the third arc-shaped transition channel, the fourth channel section 541, the clamping groove 5512, and the second air passage 5511 in sequence and then enter the expansion chamber 5521. Under the action of this part of the air, the volume of the expansion chamber 5521 increases, thereby increasing the size of the second sealing ring 55, thereby improving the coordination effect between the second sealing ring 55 and the second groove section, thereby further improving the sealing between the feeding roller 30 and the hollow connecting shaft 52.

[0070] Embodiment 5:

[0071] In this embodiment, based on the first embodiment, both ends of the air intake hole 32 in the axial direction are provided with chamfers.

[0072] In some embodiments, the air intake hole 32 is provided with chamfers at both ends of its own axial direction. The chamfer structure is a rounded corner set around the air intake hole 32. The chamfer design can reduce the sticking of seeds at the edge of the air intake hole 32, making it easier for seeds to enter and leave the air intake hole 32. That is, the smooth edge reduces the friction between the seeds and the air intake hole 32, improves the adsorption and release efficiency of the seeds, and the chamfer design can reduce the mechanical damage to the seeds when entering and leaving the air intake hole 32, thereby protecting the integrity and germination rate of the seeds.

[0073] It is understandable that the chamfered design allows at least a portion of the air intake hole 32 to be used to accommodate seeds, thereby facilitating the seeds to escape from the storage box 40. Moreover, the chamfered setting can enhance the absorption of air, thereby accelerating the flow rate of seeds, increasing the seed discharge volume per unit time, and improving the seed discharge uniformity and consistency of each row.

[0074] In some embodiments, the discharge port of the storage box 40 is configured to be semicircular and tangential to the outer wall of the feeding drum 30 to prevent seeds from leaking from both sides of the feeding drum 30 due to the rotation of the feeding drum 30. A sieve plate is provided in the storage box 40 to remove broken seeds and impurities from the seeds. The sieve plate is angled 60° with the horizontal direction.

[0075] The storage box 40 is also equipped with multiple steel wires at the discharge port. The multiple steel wires are spaced apart along the circumference of the feeding drum 30. When the feeding drum 30 rotates for sowing, the steel wires can act as a filter for the seeds, ensuring that the suction holes 32 on the feeding drum 30 only absorb one or two seeds, and the excess seeds are pushed back into the seed storage box by the steel wires. The storage box 40 is also connected to a vibrator. When the vibrator is activated, the storage box 40 vibrates, thereby evenly distributing the seeds at the bottom of the seed storage box, allowing the feeding drum 30 to better absorb the seeds and achieve precision sowing.

[0076] In some embodiments, the diameter d of the air intake hole 32 of the present application and the average seed particle size b satisfy the following equation: d = (0.64-0.66) * b. Preferably, the diameter d of the air intake hole 32 satisfies the following equation: 0.97 mm ≤ d ≤ 1.08 mm. Thus, the seeder 1 of the present application can accommodate seeds with an average seed particle size of 1.51 mm to 1.63 mm, meaning that the seeder 1 of the present application can be applied to at least "Dong Si Xiu" (green stalk cabbage), "Jisu 30" (Chinese cabbage), and "Youlv Beet Heart" (rapeseed).

[0077] In other embodiments, the present application uses a 16×8 black 128-hole standard hole tray, the outer dimensions of the hole tray L×B×H are 540mm×280mm×42mm, the center distance between the two cone holes is 32mm, the horizontal length of the feeding roller 30 of the present application is designed to be 320mm, and the diameter of the feeding roller 30 is 170mm, 8 suction holes 32 are opened, and the spacing between each suction hole 32 is 32mm. When working, the vacuum degree of the suction space 31 of the present application is 4.0kpa, the positive pressure of the air chamber is 3.0kpa, and the rotation speed of the feeding roller 30 is 14r / min, which can ensure the sowing quality of the seeder 1 during sowing, and the sowing quality is 94.06% of single grain rate, 3.11% of reseeding rate, and 2.83% of hole rate.

[0078] According to some embodiments of the present invention, the outer peripheral wall of the feeding drum 30 is provided with a plurality of suction holes 32, and the plurality of suction holes 32 are spaced apart in the axial direction. It can be understood that the plurality of suction holes 32 are all suitable for adsorbing seeds, so that the feeding drum 30 can feed more seeds, thereby improving the seed sowing efficiency.

[0079] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A precision seeder for growing seedlings in trays, characterized in that: include: Conveyor belt, suitable for conveying plug trays; The feeding shell is arranged above the conveyor belt, and the feeding shell is provided with a receiving cavity open toward the conveyor belt; A feeding drum is arranged in the accommodating cavity, an air suction space is provided in the feeding drum, and an air suction hole communicating with the air suction space is provided on the outer peripheral wall of the feeding drum; A material storage box is arranged above the feeding drum, and the material storage box is provided with a material discharge port, which is suitable for contacting the outer peripheral wall of the feeding drum; The sealing components are rotatably arranged at both ends of the feeding drum in the axial direction, and the free ends of the two sealing components are respectively connected to the inner wall of the accommodating cavity; The suction device is adapted to be connected to the sealing assembly, and the suction device is in communication with the suction space through the sealing assembly, and the suction device works to suck the air in the suction space, so that the suction holes absorb the seeds in the storage box; The sealing assembly includes a bearing and a hollow connecting shaft. The bearing is provided with a first rotating ring and a second rotating ring that can rotate relative to each other. The first rotating ring is sleeved on the outer circumference of the second rotating ring and is connected to the side wall of the feeding drum. One end of the hollow connecting shaft is connected to the inner wall of the accommodating chamber, and one end of the hollow connecting shaft is communicated with the suction device, and the other end of the hollow connecting shaft is connected to the second rotating ring, and the second rotating ring extends into the suction space; a baffle is provided on the outer peripheral wall of the hollow connecting shaft, and a sealing portion extending toward the bearing is provided on the outer peripheral edge of the baffle, and a sealing groove suitable for accommodating the sealing portion is provided on the side wall of the feeding drum; The sealing portion includes a clamping block and a sealing ring, wherein the clamping block extends toward the sealing groove; the sealing ring is disposed in the sealing groove and can rotate relative to the sealing groove; the sealing ring is provided with a clamping groove facing the baffle, and the clamping groove is suitable for accommodating the clamping block; The sealing groove includes a first groove section and a second groove section. The first groove section extends in the axial direction, and one end of the first groove section is connected to the suction space. The second groove section extends radially toward the hollow connecting shaft, and the second groove section is connected to the other end of the first groove section. The first groove section and the second groove section both accommodate sealing rings. The sealing ring includes a first sealing ring and a second sealing ring. The first sealing ring is arranged in the first groove section and is provided with a clamping groove. The second sealing ring is arranged in the second groove section and is connected to the first sealing ring. A first air passage is provided in the hollow connecting shaft, one end of the first air passage is connected to the hollow connecting shaft, the other end of the first air passage extends to the free end of the clamping block, a second air passage is provided in the clamping groove opposite to the first air passage, an expansion chamber is provided in the second sealing ring, and the expansion chamber is connected to the first air passage through the second air passage.

2. The tray seedling precision seeder according to claim 1, characterized in that: The first gas passage comprises: a first channel section, one end of the first channel section being in communication with the interior of the hollow connecting shaft, and the other end of the first channel section being obliquely extended in a direction away from the baffle; a second channel section, one end of the second channel section being connected to the other end of the first channel section, and the other end of the second channel section extending toward the baffle; a third channel section, the third channel section being formed in the baffle, one end of the third channel section being connected to the other end of the second channel section; The fourth channel segment is formed in the clamping block, one end of the fourth channel segment is connected with the other end of the third channel segment, and the other end of the fourth channel segment is opposite to the second air passage.

3. The tray seedling precision seeder according to claim 1, characterized in that: Both ends of the air suction hole in its axial direction are provided with chamfers.

4. The tray seedling precision seeder according to claim 1, characterized in that: The outer peripheral wall of the feeding drum is provided with a plurality of air suction holes, and the plurality of air suction holes are distributed at intervals in the axial direction.

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