Air suction seeding mechanism and agricultural seeding machine

Abstract

The invention discloses an air suction seeding mechanism and an agricultural seeder, the air suction seeding mechanism comprises: a seed box, which is internally provided with a seed cavity, and the bottom of the seed cavity is provided with a seed discharge port and a seed discharge output port; the central shaft fixedly penetrates through the seed box and is positioned between the seed metering passing opening and the seed metering output opening, and two ends of the central shaft are respectively provided with a negative pressure channel and a positive pressure channel; the center shaft is rotationally sleeved with the seed metering roller sleeve, a negative pressure cavity communicated with the negative pressure channel and a positive pressure cavity communicated with the positive pressure channel are defined by the seed metering roller sleeve and the center shaft, the negative pressure cavity and the positive pressure cavity are independent of each other and are arranged in a staggered mode in the circumferential direction, and through seed suction holes are formed in the circumferential wall of the seed metering roller sleeve; the seed discharging roller sleeve rotates to drive the seed suction holes to be alternately communicated with the negative pressure cavity and the positive pressure cavity; the rotary driving mechanism is used for driving the seed metering roller sleeve to rotate relative to the central shaft. According to the invention, the clamping stagnation phenomenon of seeds in the seed suction holes is avoided, the discharging smoothness is ensured, the discharging speed and efficiency of the seeds are improved, and the overall progress of the seeding operation is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and in particular to an air suction seeding mechanism. Background Art

[0002] In modern agricultural production, the efficiency and quality of the sowing process play a vital role in the yield and quality of crops. As an advanced sowing device, the air suction sowing mechanism has been widely used in the field of agricultural sowing. A special seed chamber is provided in the seed box to store various types of seeds to be sown, providing sufficient seed sources for sowing operations. In traditional air suction sowing mechanisms, seeds are stuck during discharge after adsorption. When the seeds are adsorbed by the seed suction holes on the seed discharging roller sleeve, the seeds may be stuck in the seed suction holes during the discharge process, making it impossible for the seeds to be smoothly separated from the seed suction holes and discharged. This stuck phenomenon will not only significantly reduce the sowing efficiency and hinder the progress of the sowing operation, but also cause uneven seed distribution. In the field, the uneven distribution of seeds will directly affect the growth trend of crops, causing crops in some areas to grow poorly, compete fiercely or be vacant due to excessively high or low seed density, which will have a serious negative impact on the overall yield and quality of crops. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an air suction sowing mechanism.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] An air suction sowing mechanism comprises: a seed box, which is provided with a seed cavity, and a seed discharge port and a seed discharge outlet are formed at the bottom of the seed cavity; a central axis, which is fixedly arranged in the seed box and located between the seed discharge port and the seed discharge outlet, and a negative pressure channel and a positive pressure channel are respectively arranged at both ends; a seed discharge roller sleeve, which is rotatably sleeved on the outer periphery of the central axis, and the seed discharge roller sleeve and the central axis define a negative pressure cavity connected to the negative pressure channel and a positive pressure cavity connected to the positive pressure channel, and the negative pressure cavity and the positive pressure cavity are independent of each other and circumferentially staggered, and a penetrating seed suction hole is provided on the peripheral wall of the seed discharge roller sleeve, and the rotation of the seed discharge roller sleeve can drive the seed suction hole to alternately connect with the negative pressure cavity and the positive pressure cavity; a rotary drive mechanism, which is transmission-connected to the seed discharge roller sleeve, and is used for driving the seed discharge roller sleeve to rotate relative to the central axis.

[0006] Furthermore, an inclined slide is provided on one side of the seed chamber, and a guide inclined plate is provided on the other side, the guide inclined plate is used to guide the seeds to flow toward the inclined slide, the guide inclined plate and the inclined slide are spaced apart to form a seed discharge port, and the inclined slide is used to guide the seeds to flow from the seed discharge port toward the negative pressure chamber.

[0007] Furthermore, a material baffle plate which fits with the seeding roller sleeve is provided on the side of the bottom of the inclined slide plate facing the seeding roller sleeve.

[0008] Furthermore, a seed cleaning scraper is provided on the side of the bottom of the guide inclined plate facing the seed roller sleeve, the seed cleaning scraper is arranged at intervals along the axial direction of the seed roller sleeve, adjacent seed cleaning scrapers form a seed passing gap, and the seed suction holes are arranged at intervals along the axial direction of the seed roller sleeve and are aligned with the axial direction of the seed passing gap.

[0009] Furthermore, the end of the seeding roller sleeve is connected with a rotating connector, the rotating connector is provided with a transmission tooth portion, the output shaft of the rotary drive mechanism is connected with a driving gear, and the driving gear is transmission-connected to the transmission tooth portion.

[0010] Furthermore, the driving gear is connected to the transmission tooth portion through an idler gear transmission.

[0011] Furthermore, the peripheral wall of the central shaft is provided with a negative pressure groove and a positive pressure groove which are recessed inwards, the seeding roller sleeve and the negative pressure groove define a negative pressure cavity, and the seeding roller sleeve and the positive pressure groove define a positive pressure cavity.

[0012] Furthermore, the central axis includes a central section and shaft necks arranged at both ends of the central section; the negative pressure groove and the positive pressure groove are arranged on the peripheral wall of the central section; the rotating connecting piece is provided with two to be respectively connected and fixed with the two ends of the seeding roller sleeve, and the two rotating connecting pieces are respectively rotatably sleeved on the two shaft necks, and a bearing is installed between the rotating connecting piece and the peripheral wall of the shaft neck; a connecting convex ring is provided in the middle part of the outer peripheral wall of the rotating connecting piece, and one end of the rotating connecting piece is partially embedded in the seeding roller sleeve, and the connecting convex ring and the end of the seeding roller sleeve are provided with corresponding holes to be connected and fixed by fasteners; an outer retaining ring extending inwardly is provided at the end of the rotating connecting piece away from the seeding roller sleeve; a conical surface that converges outwardly is provided on the outer periphery of the end of the central section, and a cylindrical section is connected to the outer end of the conical surface, and a sealing ring is sleeved on the cylindrical section, and the inner peripheral wall of the sealing ring has a fitting surface that fits with the conical surface, and a sealing ring retaining ring is provided between the central section and the end of the rotating connecting piece, and the sealing ring retaining ring is abutted against the sealing ring.

[0013] Furthermore, it also includes a connecting seat fixedly connected to the outer wall of the seed box, the outer end of the shaft neck is provided with a threaded shaft section, the outer periphery of the threaded shaft section is provided with a limiting plane, the connecting seat is provided with a sleeve hole sleeved on the threaded shaft section, the sleeve hole is provided with a limiting side adapted to the limiting plane, the threaded shaft section is threadedly connected with a limiting nut, and the limiting nut is provided on the outside of the connecting seat to axially limit the connecting seat.

[0014] The present invention also provides an agricultural seeder, comprising the air suction seeder mechanism.

[0015] The present invention has the following beneficial effects:

[0016] The mechanism is provided with a negative pressure channel and a positive pressure channel at both ends of the central axis, and the seeding roller sleeve and the central axis are limited to form a negative pressure chamber and a positive pressure chamber that are independent of each other and staggered in the circumferential direction; so that during the rotation of the seeding roller sleeve, the seed suction holes on the peripheral wall can accurately communicate with the negative pressure chamber and the positive pressure chamber alternately. When the seed suction hole is connected with the negative pressure chamber, the seeds are adsorbed into the seed suction hole by the negative pressure effect; and when the seed suction hole rotates to communicate with the positive pressure chamber, the positive pressure airflow can effectively blow out the seeds adsorbed in the seed suction hole, so that they can be discharged smoothly through the seed discharge outlet. This process not only avoids the stuck phenomenon of seeds in the seed suction hole, ensures the smoothness of discharge, but also improves the discharge speed and efficiency of seeds, significantly improving the overall progress of the sowing operation. Secondly, since the smoothness of the discharge process is guaranteed, the seeds can be distributed more evenly in the field. During the sowing process, the seeds are no longer accumulated near the seed suction hole due to stuck, but can be accurately placed in the soil according to the predetermined sowing density and distribution pattern. It helps to optimize the growth environment of crops so that each crop can obtain relatively balanced growth space and resources, thereby reducing poor growth, fierce competition or vacancies caused by uneven seed distribution, promoting the healthy growth of crops and improving the yield and quality of crops.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A cross-sectional view of a

[0021] Figure 3 yes Figure 1 A longitudinal cross-sectional view of

[0022] Figure 4 It is a cross-sectional view of the center shaft and the seed roller sleeve;

[0023] Figure 5 yes Figure 4 A magnified view of point A;

[0024] Figure 6 It is a schematic diagram of the structure of the decomposed state of part of the structure of the present invention;

[0025] Figure 7yes Figure 6 A magnified view of point B;

[0026] Figure 8 is a three-dimensional cross-sectional view of an embodiment of the present invention;

[0027] Fig. 9 It is a schematic diagram of the part of the structure where the seed box is missing.

[0028] Legend:

[0029] Seed box 100, seed chamber 110, inclined slide plate 111, guide inclined plate 112, seed discharge port 120, seed discharge outlet 130, material blocking plate 140, seed cleaning scraper 150, seed discharge gap 151;

[0030] Central axis 200, negative pressure channel 210, negative pressure groove 211, positive pressure channel 220, positive pressure groove 221, central section 230, conical surface 231, cylindrical section 232, journal 240, bearing 241, threaded shaft section 242, limiting plane 243, limiting nut 244, sealing ring retaining ring 250, bearing abutment 251, sealing groove 260, sealing strip 270;

[0031] Seed roller sleeve 300, negative pressure chamber 310, positive pressure chamber 320, seed suction hole 330;

[0032] Rotation drive mechanism 400, driving gear 410, idle gear 420;

[0033] Rotating connecting member 500, connecting convex ring 510, outer retaining ring 520, transmission tooth part 530;

[0034] Connecting seat 600, sleeve hole 610, limiting side edge 611;

[0035] Sealing ring 700 and fitting surface 710 . DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] Please refer to Figure 1 and Figure 2 A preferred embodiment of the present invention provides an air suction seeding mechanism, which includes a seed box 100, a central shaft 200 and a seed roller sleeve 300.

[0041] A seed cavity 110 is provided in the seed box 100 , and a seed discharge port 120 and a seed discharge port 130 are formed at the bottom of the seed cavity 110 .

[0042] The central shaft 200 is fixedly arranged in the seed box 100 and is located between the seeding port 120 and the seeding outlet 130. The two ends of the central shaft 200 are respectively provided with a negative pressure channel 210 and a positive pressure channel 220. The seeding roller sleeve 300 is rotatably sleeved on the outer periphery of the central shaft 200. The seeding roller sleeve 300 and the central shaft 200 define a negative pressure chamber 310 and a positive pressure chamber 320. The negative pressure chamber 310 and the positive pressure chamber 320 are independent of each other and are circumferentially staggered. The negative pressure channel 210 and the positive pressure channel 220 are respectively connected with the negative pressure chamber 310 and the positive pressure chamber 320. The peripheral wall of the seeding roller sleeve 300 is provided with a penetrating seed suction hole 330. The rotation of the seeding roller sleeve 300 can drive the seed suction hole 330 to alternately communicate with the negative pressure chamber 310 and the positive pressure chamber 320. It can be understood that the negative pressure channel 210 is used to communicate with the negative pressure generator, so that the negative pressure chamber 310 generates negative pressure to absorb seeds. The positive pressure channel 220 is connected to an external air intake mechanism, and the external air intake mechanism fills gas into the positive pressure channel 220, so that the positive pressure chamber 320 generates positive pressure and discharges the seeds outward.

[0043] The rotary drive mechanism 400 is connected to the seeding roller sleeve 300 for driving the seeding roller sleeve 300 to rotate relative to the central axis 200.

[0044] In a preferred embodiment of the present invention, an air suction sowing mechanism is provided, wherein a negative pressure channel 210 and a positive pressure channel 220 are respectively provided at both ends of a central axis 200, and a seeding roller sleeve 300 and the central axis 200 define a negative pressure chamber 310 and a positive pressure chamber 320 which are independent of each other and staggered in the circumferential direction; the negative pressure chamber 310 is connected with the negative pressure channel 210, and the positive pressure chamber 320 is connected with the positive pressure channel 220. In this way, during the rotation of the seeding roller sleeve 300, the seed suction holes 330 on the peripheral wall thereof can be accurately connected with the negative pressure chamber 310 and the positive pressure chamber 320 alternately. The central axis 200 does not need to rotate, and will not drive the airway pipeline to rotate, so that the airway pipeline does not need to consider the problems caused by rotation, which is convenient for installation and maintenance, and reduces production costs and equipment failure rates. When the seed suction hole 330 is connected to the negative pressure chamber 310, the seeds are adsorbed into the seed suction hole by the negative pressure effect; and when the seed suction hole 330 is rotated to be connected to the positive pressure chamber 320, the positive pressure airflow can effectively blow out the seeds adsorbed in the seed suction hole 330, so that they can be discharged smoothly through the seed discharge outlet. This process not only avoids the stuck phenomenon of seeds in the seed suction hole, ensures the smoothness of discharge, but also improves the discharge speed and efficiency of seeds, and significantly improves the overall progress of sowing operations. Secondly, since the smoothness of the discharge process is guaranteed, the seeds can be distributed more evenly in the field. During the sowing process, the seeds are no longer accumulated near the seed suction hole due to stuck, but can be accurately placed in the soil according to the predetermined sowing density and distribution pattern. This helps to optimize the growth environment of crops, so that each crop can obtain relatively balanced growth space and resources, thereby reducing the phenomenon of poor growth, fierce competition or vacancy caused by uneven seed distribution, promoting the healthy growth of crops, and improving the yield and quality of crops.

[0045] Reference Figure 2In some embodiments of the present invention, an inclined slide 111 is provided on one side of the seed chamber 110, and a guide inclined plate 112 is provided on the other side. The guide inclined plate 112 is used to guide the seeds to flow toward the inclined slide 111. The guide inclined plate 112 and the inclined slide 111 are spaced apart to form a seed discharge port 120. The inclined slide 111 is used to guide the seeds to flow from the seed discharge port 120 toward the negative pressure chamber 310, so that they are sucked by the seed suction holes 330 on the seed discharge roller sleeve 300. It can be understood that the negative pressure chamber 310 is provided on one side close to the seed discharge port 120, so that the seeds flowing on the guide inclined plate 112 will be sucked by the seed suction holes 330 passing through the negative pressure chamber 310, thereby realizing the adsorption of the seeds. In order to prevent the material from flowing directly from the inclined slide 111 to the seeding output port 130, a material baffle plate 140 is provided on the side of the bottom of the inclined slide 111 facing the seeding roller sleeve 300. The material baffle plate 140 is adjacent to the seeding roller sleeve 300, and the material baffle plate 140 and the seeding roller sleeve 300 are in contact with or have a small gap, and the gap size is smaller than the seed particle size, so that the material cannot pass through the material baffle plate 140 and the seeding roller sleeve 300, so that the material can only be adsorbed by the seed suction hole 330 and then discharged, thereby ensuring that the seed discharge is controllable.

[0046] Reference Figure 2 , Figure 8 and Fig. 9 In some embodiments of the present invention, a seed cleaning scraper 150 is provided on the side of the bottom of the guide inclined plate 112 facing the seed roller sleeve 300. The seed cleaning scrapers 150 are arranged at intervals along the axial direction of the seed roller sleeve 300. Adjacent seed cleaning scrapers 150 are formed with seed passing gaps 151. The seed suction holes 330 are arranged at intervals along the axial direction of the seed roller sleeve 300 and are axially aligned with the seed passing gaps 151, so that the seeds adsorbed on the seed suction holes 330 can rotate through the seed passing gaps 151 to avoid being scraped off by the seed cleaning scraper 150. The seed cleaning scraper 150 can scrape off the seeds adhered to the peripheral wall of the seed roller sleeve 300 to avoid excess seeds being adhered and discharged. The seed cleaning scraper 150 is fixedly installed on the bottom side of the guide inclined plate 112, and the seed cleaning scraper 150 and the guide inclined plate 112 are provided with corresponding holes to be connected and fixed by fasteners.

[0047] Reference Figure 3 , Figure 4 and Figure 5 In some embodiments of the present invention, the end of the seeding roller sleeve 300 is connected to a rotating connector 500, and the rotating connector 500 is provided with a transmission tooth portion 530. The output shaft of the rotary drive mechanism 400 is connected to a driving gear 410, and the driving gear 410 is transmission-connected to the transmission tooth portion 530, thereby driving the seeding roller sleeve 300 to rotate.

[0048] In a further embodiment of the present invention, the driving gear 410 is connected to the transmission gear portion 530 through the idler gear 420. The idler gear can change the rotation direction of the driven wheel to be the same as the direction of the driving wheel, and can extend the wheelbase and increase the transmission distance. It can be understood that the rotary drive mechanism 400 can be a rotary motor, connected to the seed box 100 through a mounting frame, and the idler gear 420 is rotatably mounted on the seed box 100 through the mounting frame, or the seed box 100 and the rotary drive mechanism 400 are both mounted on a frame, and the idler gear 420 is rotatably mounted on the frame.

[0049] In a further embodiment of the present invention, the circumferential wall of the central shaft 200 is provided with a negative pressure groove 211 and a positive pressure groove 221 which are formed by being recessed inwards, and the bottoms of the negative pressure groove 211 and the positive pressure groove 221 are provided with through holes to communicate with the negative pressure channel 210 and the positive pressure channel 220 respectively. The seeding roller sleeve 300 and the negative pressure groove 211 define a negative pressure chamber 310, and the seeding roller sleeve 300 and the positive pressure groove 221 define a positive pressure chamber 320, so that the negative pressure chamber 310 and the positive pressure chamber 320 will not change position with the rotation of the seeding roller sleeve 300, so that the negative pressure chamber 310 and the positive pressure chamber 320 are fixed in position, and can stably absorb and discharge seeds at corresponding positions, thereby ensuring smooth seeding.

[0050] Reference Figures 3 to 7 In a further embodiment of the present invention, the central shaft 200 includes a central section 230 and a journal 240 disposed at both ends of the central section 230; a negative pressure groove 211 and a positive pressure groove 221 are disposed on the peripheral wall of the central section 230; a rotating connecting member 500 is provided with two parts respectively connected and fixed to the two ends of the seeding roller sleeve 300, and the two rotating connecting members 500 are respectively rotatably sleeved on the two journals 240, and a bearing 241 is installed between the rotating connecting member 500 and the peripheral wall of the journal 240; thereby reducing the rotational friction, and in addition, the rotating connecting member 500 is rotatably installed on the journal 240, which can reduce the overall diameter size. Since only one rotating connecting member 500 is required to input power, only one of the rotating connecting members 500 needs to be provided with a transmission tooth portion 530, and the other rotating connecting member 500 may not be provided with a transmission tooth portion 530, thereby simplifying the processing.

[0051] A connecting convex ring 510 is provided in the middle of the outer peripheral wall of the rotating connecting member 500, and one end of the rotating connecting member 500 is partially embedded in the seeding roller sleeve 300, thereby ensuring the coaxial accuracy of the rotating connecting member 500 and the seeding roller sleeve 300. The connecting convex ring 510 and the end of the seeding roller sleeve 300 are provided with corresponding holes to be connected and fixed by fasteners, thereby realizing the connection and fixation of the rotating connecting member 500 and the seeding roller sleeve 300.

[0052] An outer retaining ring 520 extending inward is provided at one end of the rotating connector 500 away from the seed roller sleeve 300 to limit the axial position of the bearing 241 and prevent the bearing 241 from being separated from the rotating connector 500. A rotating connector 500 is provided on each side, and the outer retaining rings 520 on both sides also realize the axial positioning of the seed roller sleeve 300, so that the axial position of the seed roller sleeve 300 and the seed suction hole 330 is stable without obvious axial deviation. The outer periphery of the end of the center section 230 is provided with a conical surface 231 that converges outwards, and the outer end of the conical surface 231 is connected to a cylindrical section 232. A sealing ring 700 is sleeved on the cylindrical section 232. The inner peripheral wall of the sealing ring 700 has a fitting surface 710 that fits with the conical surface 231. A sealing ring retainer 250 is provided between the center section 230 and the end of the rotating connector 500. The sealing ring retainer 250 abuts against the sealing ring 700. The sealing ring retainer 250 provides an axial preload force to the sealing ring 700, and then cooperates with the conical surface 231 and the fitting surface 710, so that the conical surface 231 and the fitting surface 710 fit closely to ensure the sealing performance. The inner ring of the sealing ring retainer 250 is provided with a bearing abutment portion 251 extending toward the outer retainer 520. The bearing abutment portion 251 abuts against the inner ring of the bearing 241, thereby realizing the axial positioning of the bearing 241, and avoiding contact with the outer ring of the bearing 241, thereby reducing the rotational friction.

[0053] Reference Figure 1 and Figure 7 In a further embodiment of the present invention, a connection seat 600 is further included, which is fixedly connected to the outer wall of the seed box. The upper end of the connection seat 600 is attached to the outer wall of the seed box 100 and is provided with corresponding holes to be connected and fixed by fasteners. A threaded shaft section 242 is provided at the outer end of the shaft neck 240, and a limiting plane 243 is provided on the outer periphery of the threaded shaft section 242. The connection seat 600 is provided with a sleeve hole 610 sleeved on the threaded shaft section 242, and the sleeve hole 610 is provided with a limiting side edge 611 adapted to the limiting plane 243. The threaded shaft section 242 is threadedly connected with a limiting nut 244, and the limiting nut 244 is provided on the outer side of the connection seat 600 to axially limit the connection seat 600, thereby realizing the circumferential fixation of the connection seat 600 and the shaft neck 240 of the central shaft 200, preventing the central shaft 200 from rotating relative to the connection seat 600, and the central shaft 200 and the seed box 100 are circumferentially fixed. The threaded shaft section 242 is threadedly connected to a limiting nut 244 . The limiting nut 244 is disposed outside the connecting seat 600 to limit the axial position of the connecting seat 600 , thereby achieving connection and fixation between the connecting seat 600 and the shaft neck 240 .

[0054] In order to improve the sealing performance on both sides of the negative pressure chamber 310 and the positive pressure chamber 320, the outer peripheral wall of the central section 230 is provided with sealing grooves 260 on both sides of the circumference of the negative pressure groove 211 and the positive pressure groove 221. The sealing groove 260 is embedded with a sealing strip 270. The sealing strip 270 is positioned and installed through the sealing groove 260 to ensure the stability of the installation position. Figure 7The sealing groove 260 extends to the conical surface 231 and the cylindrical section 232 , thereby ensuring that the sealing range of the sealing strip 270 is sufficient, and intersects with the sealing ring 700 to ensure the sealing performance at the intersection of the sealing ring 700 and the sealing strip 270 .

[0055] The present invention also provides an agricultural seeder, comprising an air suction sowing mechanism to achieve smooth and uniform seeding.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air suction seeding mechanism, characterized in that: include: A seed box (100) is provided with a seed cavity (110) therein, and a seed discharge port (120) and a seed discharge outlet (130) are formed at the bottom of the seed cavity (110); The central axis (200) is fixedly arranged in the seed box (100) and is located between the seeding port (120) and the seeding outlet (130), and is provided with a negative pressure channel (210) and a positive pressure channel (220) at both ends thereof; A seeding roller sleeve (300) is rotatably sleeved on the outer periphery of the central shaft (200), the seeding roller sleeve (300) and the central shaft (200) define a negative pressure chamber (310) connected to the negative pressure channel (210) and a positive pressure chamber (320) connected to the positive pressure channel (220), the negative pressure chamber (310) and the positive pressure chamber (320) are independent of each other and are circumferentially staggered, the peripheral wall of the seeding roller sleeve (300) is provided with a penetrating seed suction hole (330), and the rotation of the seeding roller sleeve (300) can drive the seed suction hole (330) to alternately connect with the negative pressure chamber (310) and the positive pressure chamber (320); The rotary drive mechanism (400) is connected to the seeding roller sleeve (300) for driving the seeding roller sleeve (300) to rotate relative to the central axis (200).

2. The air suction seeding mechanism according to claim 1, characterized in that: The seed chamber (110) is provided with an inclined slide plate (111) on one side and a guide inclined plate (112) on the other side. The guide inclined plate (112) is used to guide the seeds to flow toward the inclined slide plate (111). The guide inclined plate (112) and the inclined slide plate (111) are spaced apart to form a seed discharge port (120). The inclined slide plate (111) is used to guide the seeds to flow from the seed discharge port (120) toward the negative pressure chamber (310).

3. The air suction seeding mechanism according to claim 2, characterized in that: A material blocking plate (140) is provided on one side of the bottom of the inclined slide (111) facing the seeding roller sleeve (300).

4. The air suction seeding mechanism according to claim 2, characterized in that: A seed cleaning scraper (150) is provided on the side of the bottom of the guide inclined plate (112) facing the seed discharging roller sleeve (300), and the seed cleaning scrapers (150) are arranged at intervals along the axial direction of the seed discharging roller sleeve (300), and adjacent seed cleaning scrapers (150) form a seed passing gap (151), and the seed suction holes (330) are arranged at intervals along the axial direction of the seed discharging roller sleeve (300) and are axially aligned with the seed passing gap (151).

5. The air suction seeding mechanism according to claim 1, characterized in that: The end of the seeding roller sleeve (300) is connected to a rotating connection piece (500), and the rotating connection piece (500) is provided with a transmission tooth portion (530). The output shaft of the rotating drive mechanism (400) is connected to a driving gear (410), and the driving gear (410) is in transmission connection with the transmission tooth portion (530).

6. The air suction seeding mechanism according to claim 5, characterized in that: The driving gear (410) is connected to the transmission gear portion (530) by transmission via the idler gear (420).

7. The air suction seeding mechanism according to claim 5, characterized in that: The peripheral wall of the central shaft (200) is provided with a negative pressure groove (211) and a positive pressure groove (221) which are recessed inwards; the seeding roller sleeve (300) and the negative pressure groove (211) define a negative pressure cavity (310); and the seeding roller sleeve (300) and the positive pressure groove (221) define a positive pressure cavity (320).

8. The air suction seeding mechanism according to claim 7, characterized in that: The central shaft (200) comprises a central section (230) and journals (240) arranged at both ends of the central section (230); the negative pressure groove (211) and the positive pressure groove (221) are arranged on the peripheral wall of the central section (230); the rotating connecting member (500) is provided with two journals respectively connected and fixed to the two ends of the seeding roller sleeve (300), the two rotating connecting members (500) are respectively rotatably sleeved on the two journals (240), and a bearing (241) is installed between the rotating connecting member (500) and the peripheral wall of the journal (240); a connecting convex ring (510) is provided in the middle of the outer peripheral wall of the rotating connecting member (500), one end of the rotating connecting member (500) is partially embedded in the seeding roller sleeve (300), and the connecting convex ring (510) and the end of the seeding roller sleeve (300) are provided with corresponding holes to be connected and fixed by fasteners; An outer retaining ring (520) extending inward is provided at one end of the rotary connecting member (500) away from the seed discharging roller sleeve (300); a conical surface (231) contracting outward is provided on the outer periphery of the end of the central section (230); a cylindrical section (232) is connected to the outer end of the conical surface (231); a sealing ring (700) is sleeved on the cylindrical section (232); an inner peripheral wall of the sealing ring (700) has a fitting surface (710) fitting with the conical surface (231); a sealing ring retaining ring (250) is provided between the central section (230) and the end of the rotary connecting member (500); the sealing ring retaining ring (250) abuts against the sealing ring (700).

9. The air suction seeding mechanism according to claim 8, characterized in that: It also includes a connecting seat (600) fixedly connected to the outer wall of the seed box, the outer end of the shaft neck (240) is provided with a threaded shaft section (242), the outer periphery of the threaded shaft section (242) is provided with a limiting plane (243), the connecting seat (600) is provided with a sleeve hole (610) sleeved on the threaded shaft section (242), the sleeve hole (610) is provided with a limiting side (611) adapted to the limiting plane (243), the threaded shaft section (242) is threadedly connected to a limiting nut (244), and the limiting nut (244) is provided on the outer side of the connecting seat (600) to axially limit the connecting seat (600).

10. An agricultural seeder, characterized in that: It comprises the air suction seeding mechanism as described in any one of claims 1 to 9.

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