Air suction seeding mechanism and agricultural seeding machine

Abstract

The application discloses a kind of air suction seeding mechanism and agricultural seeding machine, comprising: seed tank, seed cavity is internally provided, seed cavity bottom is formed with seed discharge port and seed output port;Center shaft, fixedly passes through and is located between seed discharge port and seed output port in seed tank, two ends are respectively provided with negative pressure channel and positive pressure channel;Seed roll cover, rotation sleeve is set in center shaft, with center shaft limit formation with negative pressure channel communication negative pressure cavity and with positive pressure channel communication positive pressure cavity, negative pressure cavity and positive pressure cavity are independently and circumferentially staggered arrangement, seed roll cover peripheral wall is provided with through suction hole, seed roll cover rotation can drive suction hole and negative pressure cavity and positive pressure cavity alternate communication;Rotary drive mechanism is used to drive seed roll cover relative rotation activity of center shaft.The application avoids the jamming phenomenon of seed in suction hole, ensures the smoothness of discharge, and improves the discharge speed and efficiency of seed, significantly improves the overall progress of seeding operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural machinery, in particular, to an air suction seeding mechanism. BACKGROUND

[0002] In modern agricultural production, the efficiency and quality of the seeding link play a crucial role in the yield and quality of crops. As an advanced seeding device, the air suction seeding mechanism has been widely used in the field of agricultural seeding. A special seed chamber is provided in the seed box for storing various types of seeds to be seeded, providing an adequate source of seeds for seeding operations. In the traditional air suction seeding mechanism, the seeds are prone to jamming when being discharged after being adsorbed. When the seeds are adsorbed by the suction holes on the seed discharge roller cover, the seeds may be jammed in the suction holes during the discharging process, making it difficult for the seeds to smoothly separate from the suction holes and be discharged. This jamming phenomenon not only significantly reduces the seeding efficiency, causing the progress of the seeding operation to be hindered, but also causes uneven distribution of seeds. In the field, uneven distribution of seeds will directly affect the growth trend of crops, causing some areas of crops to grow poorly, compete fiercely, or be vacant due to excessively high or low seed density, thereby seriously affecting the overall yield and quality of crops. SUMMARY

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

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

[0005] An air suction seeding mechanism, comprising: a seed box, provided with a seed chamber, the bottom of the seed chamber is formed with a seed discharge port and a seed output port; a central shaft, fixedly penetrating the seed box and located between the seed discharge port and the seed output port, both ends of the central shaft are provided with a negative pressure channel and a positive pressure channel; a seed discharge roller cover, rotatably sleeved on the outer periphery of the central shaft, the seed discharge roller cover and the central shaft define a negative pressure cavity in communication with the negative pressure channel and a positive pressure cavity in communication with the positive pressure channel, the negative pressure cavity and the positive pressure cavity are independently and circumferentially staggered, the seed discharge roller cover is provided with a suction hole penetrating the peripheral wall, and the seed discharge roller cover is rotatable to drive the suction hole to alternately communicate with the negative pressure cavity and the positive pressure cavity; a rotary driving mechanism, connected in transmission with the seed discharge roller cover, for driving the seed discharge roller cover to rotate relative to the central shaft.

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

[0007] Further, the bottom of the inclined plate is provided with a material blocking plate which is attached to the seed sowing roller cover.

[0008] Further, the bottom of the guiding inclined plate is provided with a seed cleaning scraper which is arranged along the axial direction of the seed sowing roller cover, and adjacent seed cleaning scrapers form a seed overrunning gap.

[0009] Further, the end of the seed sowing roller cover is connected with a rotary connecting piece which is provided with a transmission tooth part, the output shaft of the rotary driving mechanism is connected with a driving gear, and the driving gear is connected with the transmission tooth part in transmission.

[0010] Further, the driving gear is connected with the transmission tooth part through an idle gear transmission.

[0011] Further, the circumferential wall of the central shaft is provided with an inwardly recessed negative pressure groove and a positive pressure groove, the seed sowing roller cover and the negative pressure groove define a negative pressure cavity, and the seed sowing roller cover and the positive pressure groove define a positive pressure cavity.

[0012] Further, the central shaft comprises a central segment and shaft journals arranged at both ends of the central segment, the negative pressure groove and the positive pressure groove are arranged on the circumferential wall of the central segment, the rotary connecting piece is provided with two rotary connecting pieces which are respectively connected and fixed with both ends of the seed sowing roller cover, the two rotary connecting pieces are respectively rotatably sleeved on the two shaft journals, bearings are arranged between the circumferential walls of the rotary connecting pieces and the shaft journals, a connecting convex ring is arranged on the middle part of the circumferential wall of the rotary connecting piece, one end of the rotary connecting piece is partially embedded in the seed sowing roller cover, the connecting convex ring and the end of the seed sowing roller cover are provided with corresponding hole positions to be connected and fixed through fasteners, the end of the rotary connecting piece which is away from the seed sowing roller cover is provided with an inwardly extending outer blocking ring, the outer circumferential wall of the end of the central segment is provided with an outwardly folded conical surface, a cylindrical segment is connected with the outer end of the conical surface, a sealing ring is sleeved on the cylindrical segment, the inner circumferential wall of the sealing ring has a fitting surface which is attached to the conical surface, a sealing ring blocking ring is arranged between the end of the central segment and the rotary connecting piece, and the sealing ring blocking ring is abutted with the sealing ring.

[0013] Further, a connecting seat which is fixedly connected to the outer wall of the seed box is further included, the outer end of the shaft journal is provided with a threaded shaft segment, the outer circumferential wall of the threaded shaft segment is provided with a limiting plane, the connecting seat is provided with a sleeve hole which is sleeved on the threaded shaft segment, the sleeve hole is provided with a limiting side edge which is matched with the limiting plane, the threaded shaft segment is threadedly connected with a limiting nut, and the limiting nut is arranged on the outer side of the connecting seat to axially limit the connecting seat.

[0014] The application further provides an agricultural seeding machine which comprises the air suction seeding mechanism.

[0015] The application 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 shaft respectively, and the seed discharge roller sleeve and the central shaft define negative pressure cavities and positive pressure cavities which are independently arranged and circumferentially staggered; the seed suction holes on the peripheral wall of the seed discharge roller sleeve can be alternately communicated with the negative pressure cavities and the positive pressure cavities in the rotating process. When the seed suction holes are communicated with the negative pressure cavities, the seeds are adsorbed into the seed suction holes by the negative pressure; when the seed suction holes are rotated to be communicated with the positive pressure cavities, the positive pressure airflow can effectively blow the seeds adsorbed in the seed suction holes out, so that the seeds are smoothly discharged through the seed discharge output port. This process not only avoids the jamming phenomenon of the seeds in the seed suction holes, ensures the smoothness of the discharge, but also improves the discharge speed and efficiency of the seeds, and significantly improves the overall progress of the seeding operation. Secondly, since the smoothness of the discharge process is guaranteed, the seeds can be more uniformly distributed in the field. In the seeding process, the seeds are no longer accumulated near the seed suction holes due to jamming, but can be accurately placed into the soil according to the predetermined seeding density and distribution mode. It helps to optimize the growth environment of crops, so that each crop can obtain relatively balanced growth space and resources, thereby reducing the growth of poor, intense competition or vacancy caused by uneven distribution of seeds, promoting the healthy growth of crops, and improving the yield and quality of crops.

[0017] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate embodiments of the application and assist in explaining the application. In the drawings:

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

[0020] Figure 2 is a cross-sectional view of Figure 1 ;

[0021] Figure 3 is a longitudinal cross-sectional view of Figure 1 ;

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

[0023] Figure 5 is an enlarged view of A of Figure 4 ;

[0024] Figure 6 is a schematic diagram of the exploded state structure of part of the structure of the present application;

[0025] Figure 7is Figure 6 enlarged view of B of

[0026] Figure 8 is a perspective view of a sectional view of an embodiment of the present application;

[0027] Figure 9 is a partial structural schematic diagram without a seed tank.

[0028] Legend:

[0029] seed tank 100, seed cavity 110, inclined plate 111, guide inclined plate 112, seed discharge port 120, seed output port 130, material blocking plate 140, seed cleaning scraper 150, seed passing gap 151;

[0030] central shaft 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, shaft neck 240, bearing 241, threaded shaft section 242, limiting plane 243, limiting nut 244, sealing ring retainer 250, bearing abutting portion 251, sealing groove 260, sealing strip 270;

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

[0032] rotary drive mechanism 400, driving gear 410, driven gear 420;

[0033] rotary connecting piece 500, connecting convex ring 510, outer retainer 520, transmission tooth portion 530;

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

[0035] sealing ring 700, abutting surface 710. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are merely exemplary and do not limit the present application.

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications will also change accordingly.

[0039] In addition, the descriptions involving "first", "second", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0040] Please refer to Figure 1 and Figure 2 In a preferred embodiment of the present application, the air suction seeding mechanism comprises a seed box 100, a central shaft 200 and a seed roll sleeve 300.

[0041] The seed box 100 is provided with a seed cavity 110, and the bottom of the seed cavity 110 is formed with a seed discharge port 120 and a seed output port 130.

[0042] The central shaft 200 is fixedly arranged in the seed box 100 and located between the seed discharge port 120 and the seed output port 130, and the two ends of the central shaft 200 are respectively provided with a negative pressure channel 210 and a positive pressure channel 220. The seed roll sleeve 300 is rotatably arranged on the outer periphery of the central shaft 200, and the seed roll sleeve 300 and the central shaft 200 define a negative pressure cavity 310 and a positive pressure cavity 320, which are independently arranged and circumferentially staggered. The negative pressure channel 210 and the positive pressure channel 220 are in communication with the negative pressure cavity 310 and the positive pressure cavity 320, respectively. The circumferential wall of the seed roll sleeve 300 is provided with a plurality of suction holes 330 penetrating through the circumferential wall, and the seed roll sleeve 300 is rotatable to drive the suction holes 330 to alternately communicate with the negative pressure cavity 310 and the positive pressure cavity 320. It can be understood that the negative pressure channel 210 is used to communicate with a negative pressure generator, so as to generate negative pressure in the negative pressure cavity 310 to adsorb seeds. The positive pressure channel 220 is in communication with an external air inlet mechanism, and the external air inlet mechanism fills the positive pressure channel 220 with gas, so that the positive pressure cavity 320 generates positive pressure to discharge seeds outward.

[0043] The rotary driving mechanism 400 is in transmission connection with the seed roll sleeve 300, and is used to drive the seed roll sleeve 300 to rotate relative to the central shaft 200.

[0044] In a preferred embodiment of the present application, a suction seeding mechanism is provided with a negative pressure channel 210 and a positive pressure channel 220 arranged at both ends of the central shaft 200 respectively, and the seed discharge roller sleeve 300 and the central shaft 200 define a negative pressure cavity 310 and a positive pressure cavity 320 arranged independently and circumferentially staggered; the negative pressure cavity 310 is in communication with the negative pressure channel 210, and the positive pressure cavity 320 is in communication with the positive pressure channel 220. During the rotation of the seed discharge roller sleeve 300, the suction holes 330 on the peripheral wall thereof can be precisely communicated with the negative pressure cavity 310 and the positive pressure cavity 320 alternately. The central shaft 200 does not need to rotate, and the air duct pipeline is not driven to rotate, so that the air duct pipeline does not need to consider the problems caused by rotation additionally, and the installation and maintenance are facilitated, and the production cost and the equipment failure rate are reduced. When the suction hole 330 is communicated with the negative pressure cavity 310, the seed is adsorbed into the suction hole by the negative pressure effect; when the suction hole 330 is rotated to be communicated with the positive pressure cavity 320, the seed adsorbed in the suction hole 330 can be effectively blown out by the positive pressure airflow, so as to pass through the seed discharge output port smoothly. This process not only avoids the jamming phenomenon of the seed in the suction hole, ensures the smoothness of the discharge, but also improves the discharge speed and efficiency of the seed, and significantly improves the overall progress of the seeding operation. Secondly, since the smoothness of the discharge process is guaranteed, the seed can be more uniformly distributed in the field. In the seeding process, the seed is no longer accumulated near the suction hole due to jamming, but can be accurately put into the soil according to the predetermined seeding density and distribution mode. This helps to optimize the growth environment of crops, so that each crop can obtain relatively balanced growth space and resources, thereby reducing the growth of poor, fierce competition or vacancy caused by uneven seed distribution, promoting the healthy growth of crops, and improving the yield and quality of crops.

[0045] With reference to Figure 2In some embodiments of the present application, the seed cavity 110 is provided with an inclined 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 seed flow to the inclined plate 111. The guide inclined plate 112 is spaced apart from the inclined plate 111 to form a seed discharge opening 120. The inclined plate 111 is used to guide the seed flow from the seed discharge opening 120 to the negative pressure cavity 310, so that the seed is sucked by the seed suction hole 330 on the seed discharge roller 300. It can be understood that the negative pressure cavity 310 is arranged on the side close to the seed discharge opening 120, so that the seed flowing on the guide inclined plate 112 is sucked by the seed suction hole 330 passing through the negative pressure cavity 310, and the seed suction is realized. In order to avoid that the material flows directly from the inclined plate 111 to the seed discharge outlet 130, the bottom of the inclined plate 111 is provided with a material blocking plate 140 on the side facing the seed discharge roller 300. The material blocking plate 140 is adjacent to the seed discharge roller 300, and the material blocking plate 140 is attached to the seed discharge roller 300 or has a small gap. The gap size is smaller than the seed particle size, so that the material cannot pass between the material blocking plate 140 and the seed discharge roller 300, and the material can only be discharged after being sucked by the seed suction hole 330, so as to ensure the controllable seed discharge.

[0046] Referring to Figure 2 , Figure 8 and Figure 9 In some embodiments of the present application, the bottom of the guide inclined plate 112 is provided with a seed cleaning scraper 150 on the side facing the seed discharge roller 300. The seed cleaning scraper 150 is arranged and spaced apart along the axial direction of the seed discharge roller 300. Adjacent seed cleaning scrapers 150 form a seed discharge gap 151. The seed suction hole 330 is arranged and spaced apart along the axial direction of the seed discharge roller 300 and is axially aligned with the seed discharge gap 151, so that the seed adsorbed on the seed suction hole 330 can rotate through the seed discharge gap 151 and avoid being scraped off by the seed cleaning scraper 150. The seed cleaning scraper 150 can scrape the seeds adhered to the wall of the seed discharge roller 300, so as to avoid that the excess seeds are adhered and discharged. The seed cleaning scraper 150 is fixedly installed on the bottom side of the guide inclined plate 112. The seed cleaning scraper 150 and the guide inclined plate 112 are provided with corresponding hole positions to be connected and fixed by fasteners.

[0047] Referring to Figure 3 , Figure 4 and Figure 5 In some embodiments of the present application, the seed discharge roller 300 is connected with a rotary connecting piece 500. The rotary connecting piece 500 is provided with a transmission tooth portion 530. The output shaft of the rotary driving mechanism 400 is connected with a driving gear 410. The driving gear 410 is in transmission connection with the transmission tooth portion 530, so as to drive the seed discharge roller 300 to rotate.

[0048] In further embodiments of the present application, the driving gear 410 is connected with the transmission gear 530 through the idler gear 420. The idler gear can change the rotation direction of the driven gear to be the same as that of the driving gear, and can extend the axle distance and increase the transmission distance. It can be understood that the rotation driving mechanism 400 can be a rotation motor, which is connected with 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 rotation driving mechanism 400 are both mounted on a machine frame, and the idler gear 420 is rotatably mounted on the machine frame.

[0049] In further embodiments of the present application, the peripheral wall of the central shaft 200 is provided with an inwardly recessed negative pressure groove 211 and a positive pressure groove 221, and the groove 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 seed discharge roller sleeve 300 and the negative pressure groove 211 define a negative pressure cavity 310, and the seed discharge roller sleeve 300 and the positive pressure groove 221 define a positive pressure cavity 320, so that the negative pressure cavity 310 and the positive pressure cavity 320 do not change positions with the rotation of the seed discharge roller sleeve 300, and the positions of the negative pressure cavity 310 and the positive pressure cavity 320 are fixed, which can stabilize the seed suction and discharge at the corresponding positions and ensure the smooth seed discharge.

[0050] Referring to Figures 3 to 7 In further embodiments of the present application, the central shaft 200 includes a central section 230 and shaft 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, and the rotation connecting member 500 is provided with two ends to be connected and fixed with the seed discharge roller sleeve 300, respectively, the two rotation connecting members 500 are rotatably sleeved on the two shaft journals 240, respectively, and bearings 241 are arranged between the peripheral wall of the rotation connecting member 500 and the shaft journal 240, so as to reduce the rotation friction force, and the rotation connecting member 500 is rotatably arranged on the shaft journal 240, which can reduce the overall diameter size. Since only one rotation connecting member 500 is needed to input power, only one of the rotation connecting members 500 needs to be provided with the transmission gear 530, and the other rotation connecting member 500 can not be provided with the transmission gear 530, which simplifies the processing.

[0051] The outer peripheral wall of the rotation connecting member 500 is provided with a connecting convex ring 510, and one end of the rotation connecting member 500 is embedded in the seed discharge roller sleeve 300, so as to ensure the coaxial precision of the rotation connecting member 500 and the seed discharge roller sleeve 300. The connecting convex ring 510 and the end of the seed discharge roller sleeve 300 are provided with corresponding hole positions to be connected and fixed through fasteners, so as to realize the connection and fixation of the rotation connecting member 500 and the seed discharge roller sleeve 300.

[0052] The outer baffle ring 520 extending inward is arranged at one end of the rotary connecting piece 500 away from the seed sowing roller sleeve 300, so as to axially position the bearing 241 and avoid the bearing 241 from being separated from the rotary connecting piece 500. The rotary connecting piece 500 is arranged on both sides, and the outer baffle rings 520 on both sides also achieve the axial positioning of the seed sowing roller sleeve 300, so that the axial positions of the seed sowing roller sleeve 300 and the seed suction hole 330 are stable, and no obvious axial deviation occurs. The outer periphery of the end portion of the center section 230 is provided with a tapered surface 231 that is folded outward, the tapered surface 231 is connected with a cylindrical section 232, the cylindrical section 232 is sleeved with a sealing ring 700, the inner peripheral wall of the sealing ring 700 is provided with a fitting surface 710 that is fitted with the tapered surface 231, and the sealing ring 700 is abutted with a sealing ring baffle 250 between the center section 230 and the end portion of the rotary connecting piece 500. The sealing ring baffle 250 provides an axial pre-tightening force for the sealing ring 700, and cooperates with the tapered surface 231 and the fitting surface 710, so that the tapered surface 231 and the fitting surface 710 are tightly fitted, and the sealing performance is ensured. The inner ring of the sealing ring baffle 250 is provided with a bearing abutting portion 251 extending towards the outer baffle ring 520, the bearing abutting portion 251 is abutted with the inner ring of the bearing 241, so as to achieve the axial positioning of the bearing 241, and the outer ring of the bearing 241 is avoided from being contacted, thereby reducing the rotary friction.

[0053] Referring to Figure 1 and Figure 7 In further embodiments of the present application, a connecting seat 600 fixedly connected to the outer wall of the seed box is also included, the upper end of the connecting seat 600 is fitted with the outer wall of the seed box 100 and is provided with corresponding hole positions to be connected and fixed by fasteners. 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 matched with the limiting plane 243, the threaded shaft section 242 is threadedly connected with a limiting nut 244, and the limiting nut 244 is arranged on the outer side of the connecting seat 600 to axially position the connecting seat 600, thereby achieving the circumferential fixation of the connecting seat 600 and the shaft neck 240 of the center shaft 200, avoiding the rotation of the center shaft 200 relative to the connecting seat 600, and circumferentially fixing the center shaft 200 and the seed box 100. The threaded shaft section 242 is threadedly connected with the limiting nut 244, and the limiting nut 244 is arranged on the outer side of the connecting seat 600 to axially position the connecting seat 600, thereby achieving the connecting and fixing of the connecting seat 600 and the shaft neck 240.

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

[0055] The application also provides an agricultural seeding machine, which comprises the air suction seeding mechanism to realize smooth and uniform seed sowing.

[0056] The above only is the preferred embodiment of the present application, and is not used to limit the present application, and the present application can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pneumatic seeding mechanism, characterized in that, include: The seed box (100) has a seed cavity (110) inside, and a seed discharge port (120) and a seed discharge outlet (130) are formed at the bottom of the seed cavity (110). The central shaft (200) is fixedly installed in the seed box (100) and located between the seed discharge port (120) and the seed output port (130), with a negative pressure channel (210) and a positive pressure channel (220) at both ends respectively. A seed metering roller sleeve (300) is rotatably sleeved on the outer periphery of a central shaft (200). The seed metering roller sleeve (300) and the central shaft (200) define a negative pressure cavity (310) communicating with a negative pressure channel (210) and a positive pressure cavity (320) communicating with a positive pressure channel (220). The negative pressure cavity (310) and the positive pressure cavity (320) are independent of each other and are circumferentially offset. The peripheral wall of the seed metering roller sleeve (300) is provided with a through seed suction hole (330). The rotation of the seed metering roller sleeve (300) can drive the seed suction hole (330) to alternately communicate with the negative pressure cavity (310) and the positive pressure cavity (320). A rotary drive mechanism (400) is connected to the seed metering roller sleeve (300) for driving the seed metering roller sleeve (300) to rotate relative to the central shaft (200); The seeding roller sleeve (300) is connected to a rotating connector (500) at its end. The rotating connector (500) is provided with a transmission tooth (530). The output shaft of the rotating drive mechanism (400) is connected to a drive gear (410). The drive gear (410) is connected to the transmission tooth (530) in a transmission connection. The central shaft (200) has an inwardly recessed negative pressure groove (211) and a positive pressure groove (221) on its peripheral wall. The seed metering roller sleeve (300) and the negative pressure groove (211) define a negative pressure cavity (310), and the seed metering roller sleeve (300) and the positive pressure groove (221) define a positive pressure cavity (320). The central shaft (200) includes a central section (230) and journals (240) located at both ends of the central section (230); the negative pressure groove (211) and the positive pressure groove (221) are located on the peripheral wall of the central section (230); two rotating connectors (500) are provided to be connected and fixed to both ends of the seeding roller sleeve (300), and the two rotating connectors (500) are respectively rotatably sleeved on the two journals (240), and bearings (241) are installed between the rotating connectors (500) and the peripheral wall of the journals (240); a connecting protrusion ring (510) is provided in the middle of the outer peripheral wall of the rotating connector (500), and one end of the rotating connector (500) is partially embedded in the seeding roller sleeve (300), and the connecting protrusion ring (510) is... The rotating connector (500) has corresponding holes at the end of the seeding roller sleeve (300) for connection and fixation by fasteners; the end of the rotating connector (500) away from the seeding roller sleeve (300) has an inwardly extending outer retaining ring (520); the outer periphery of the end of the central section (230) has an outwardly concave conical surface (231), the outer end of the conical surface (231) is connected to a cylindrical section (232), a sealing ring (700) is fitted 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 retaining ring (250) is provided between the central section (230) and the end of the rotating connector (500), and the sealing ring retaining ring (250) abuts against the sealing ring (700).

2. The air-suction seeding mechanism according to claim 1, characterized in that, The seed chamber (110) has an inclined slide (111) on one side and a guide slide (112) on the other side. The guide slide (112) is used to guide the seeds to flow to the inclined slide (111). The guide slide (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).

3. The air-suction seeding mechanism according to claim 2, characterized in that, The bottom of the inclined slide (111) is provided with a baffle plate (140) on the side facing the seeding roller sleeve (300).

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

5. The air-suction seeding mechanism according to claim 1, characterized in that, The drive gear (410) and the transmission gear (530) are connected by idler gear (420).

6. The air-suction seeding mechanism according to claim 1, 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 journal (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 with a limiting nut (244). The limiting nut (244) is provided on the outside of the connecting seat (600) to axially limit the connecting seat (600).

7. An agricultural seeder, characterized in that, Includes the air-suction seeding mechanism as described in any one of claims 1 to 6.

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