Seed metering roll shaft structure

Abstract

The utility model discloses a seed-metering roll shaft structure, which comprises a central shaft, a seed-metering roll shaft, a seed-metering roll shaft, a seed-metering roll shaft and a seed-metering roll shaft, a negative pressure channel and a positive pressure channel which extend towards the center are respectively arranged on two end surfaces of the central shaft, and are respectively communicated with the negative pressure groove and the positive pressure groove; the periphery of the central shaft is sleeved with the seed metering roller sleeve, a negative pressure cavity is defined by the seed metering roller sleeve and the negative pressure groove, a positive pressure cavity is defined by the seed metering roller sleeve and the positive pressure groove, and through seed suction holes are formed in the peripheral wall of the seed metering roller sleeve. Through the negative pressure cavity and the positive pressure cavity, seeds can be smoothly discharged through positive pressure after being adsorbed, the seeds are effectively prevented from being blocked at a seed suction opening, the two ends of the center shaft can be connected with an air channel pipeline, interference of other structures can be avoided, and in addition, the center shaft does not need to rotate and cannot drive the air channel pipeline to rotate; the problems caused by rotation do not need to be additionally considered for the air channel pipeline, installation and maintenance are convenient, and the production cost and the equipment failure rate are reduced.

Description

Technical Field

[0001] This utility model relates to the field of agricultural automation machinery technology, and in particular, to a seed metering roller structure. Background Technology

[0002] In modern agricultural production, seed metering technology is one of the key factors in ensuring sowing quality and efficiency. Existing pneumatic seed metering technology mainly relies on negative pressure to adsorb seeds. This method, after seed adsorption, easily leads to seed blockage at the suction port during expulsion, causing seed gaps and severely affecting the continuity and uniformity of sowing. Adding positive pressure seed metering often results in complex structures, and the rotation of the seed metering rollers makes the air duct layout more complicated. Utility Model Content

[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 a seed metering roller structure.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A seed metering roller structure includes: a central shaft with inwardly recessed negative pressure grooves and positive pressure grooves on its peripheral wall, the negative pressure grooves and positive pressure grooves being spaced apart circumferentially; negative pressure channels and positive pressure channels extending towards the center on both end faces of the central shaft, the negative pressure channels and positive pressure channels communicating with the negative pressure grooves and positive pressure grooves respectively; a seed metering roller sleeve fitted around the outer periphery of the central shaft, the seed metering roller sleeve and the negative pressure grooves defining a negative pressure cavity, the seed metering roller sleeve and the positive pressure grooves defining a positive pressure cavity, the peripheral wall of the seed metering roller sleeve having a through seed suction hole; a rotatable connector rotatably fitted around the outer periphery of the central shaft and connected and fixed to the seed metering roller sleeve; an axial sealing structure installed between the outer peripheral wall of the central shaft and the inner wall of the seed metering roller sleeve for sealing both sides of the negative pressure cavity and the positive pressure cavity; and an end sealing structure installed between both ends of the seed metering roller sleeve and the central shaft for sealing both ends of the negative pressure cavity and the positive pressure cavity.

[0006] Furthermore, the central shaft includes a central section and journals located at both ends of the central section; the diameter of the journals is smaller than that of the central section; the negative pressure groove and the positive pressure groove are located on the peripheral wall of the central section; two rotating connectors are provided to be connected and fixed to both ends of the seeding roller sleeve respectively, the two rotating connectors are respectively rotatably sleeved on the two journals, and bearings are installed between the rotating connectors and the peripheral wall of the journals.

[0007] Furthermore, the rotating connector has a connecting protrusion ring in the middle of its outer peripheral wall, and one end of the rotating connector is partially embedded in the seed metering roller sleeve. The connecting protrusion ring and the end of the seed metering roller sleeve have corresponding holes for connection and fixation by fasteners.

[0008] Furthermore, the end of the rotary connector away from the seeding roller sleeve is provided with an inwardly extending outer retaining ring.

[0009] Furthermore, the outer periphery of the central section end is provided with an outwardly concave conical surface, and a cylindrical section is connected to the outer end of the conical surface. The end sealing structure is a sealing ring sleeved on the cylindrical section. The inner peripheral wall of the sealing ring has a fitting surface that fits with the conical surface. A sealing ring retainer is provided between the central section and the end of the rotating connector, and the sealing ring retainer abuts against the sealing ring.

[0010] Furthermore, the inner ring of the sealing ring retainer is provided with a bearing abutment portion extending toward the outer retainer ring, and the bearing abutment portion abuts against the inner ring of the bearing.

[0011] Furthermore, one of the rotary connectors is provided with a transmission tooth.

[0012] Furthermore, it also includes a connecting seat, wherein the outer end of the journal 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 fitted onto 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, the limiting nut is provided on the outside of the connecting seat to axially limit the connecting seat.

[0013] Furthermore, the outer peripheral wall of the central section is provided with sealing grooves on both sides of the negative pressure groove and the positive pressure groove, and the axial sealing structure is a sealing strip embedded in the sealing groove.

[0014] Furthermore, the sealing groove extends to the conical surface and the cylindrical section.

[0015] This utility model has the following beneficial effects:

[0016] By setting negative and positive pressure grooves, along with corresponding negative and positive pressure chambers, on the central shaft, seeds can be smoothly discharged using positive pressure after adsorption, effectively preventing seed blockage at the seed suction port. This solves the seed interruption problem caused by seed blockage in existing technologies, significantly improving the continuity and uniformity of sowing. Furthermore, it eliminates the need for a complex positive pressure seed metering device. The fit between the seed metering roller sleeve and the central shaft, along with the rotating connector, simplifies the air duct layout. Both ends of the central shaft can be connected to the air duct, avoiding interference from other structures. Additionally, the central shaft does not need to rotate, thus avoiding rotation issues in the air duct, facilitating installation and maintenance, and reducing production costs and equipment failure rates. The axial and end sealing structures effectively seal both sides and ends of the negative and positive pressure chambers, ensuring a stable supply of negative and positive pressure airflow, further improving the accuracy and reliability of seed metering, and guaranteeing sowing quality. The negative pressure groove and the positive pressure groove are distributed circumferentially, which enables the seed metering roller to continuously adsorb and discharge seeds during rotation, greatly improving seed metering efficiency and meeting the high requirements of modern agricultural production for sowing efficiency.

[0017] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

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

[0020] Figure 2 yes Figure 1 A schematic diagram of the decomposed state structure;

[0021] Figure 3 yes Figure 1 A sectional view;

[0022] Figure 4 yes Figure 3 Enlarged view of point A;

[0023] Figure 5 This is a schematic diagram of the central axis structure;

[0024] Figure 6 It is a cross-sectional view of the central shaft and the seed metering roller sleeve.

[0025] Legend:

[0026] Central shaft 100, negative pressure groove 110, negative pressure channel 111, positive pressure groove 120, positive pressure channel 121, central section 130, conical surface 131, cylindrical section 132, journal 140, bearing 141, threaded shaft section 142, limiting plane 143, limiting nut 144, sealing ring retaining ring 150, bearing abutment part 151, sealing groove 160;

[0027] Seed metering roller sleeve 200, negative pressure chamber 210, positive pressure chamber 220, seed suction hole 230;

[0028] Rotary connector 300, connecting convex ring 310, outer retaining ring 320, transmission gear 330;

[0029] Axial sealing structure 400;

[0030] End sealing structure 500, mating surface 510;

[0031] Connector 600, sleeve hole 610, limit side 611. Detailed Implementation

[0032] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0036] Please refer to Figures 1 to 3 A preferred embodiment of the present invention provides a seed metering roller structure, including a central shaft 100, a seed metering roller sleeve 200, a rotating connector 300, an axial sealing structure 400, and an end sealing structure 500.

[0037] The central shaft 100 has inwardly recessed negative pressure grooves 110 and positive pressure grooves 120 on its peripheral wall, which are spaced apart circumferentially. The two end faces of the central shaft 100 have negative pressure channels 111 and positive pressure channels 121 extending towards the center, respectively, which communicate with the negative pressure grooves 110 and 120. (Refer to...) Figure 5 The inner wall of the negative pressure groove 110 is provided with a negative pressure through hole 112 to communicate with the negative pressure channel 111, and the inner wall of the positive pressure groove 120 is provided with a positive pressure through hole 122 to communicate with the positive pressure channel 121.

[0038] A seed metering roller sleeve 200 is fitted around the outer periphery of the central shaft 100. The seed metering roller sleeve 200 and the negative pressure groove 110 define a negative pressure cavity 210, and the seed metering roller sleeve 200 and the positive pressure groove 120 define a positive pressure cavity 220. The peripheral wall of the seed metering roller sleeve 200 is provided with through seed suction holes 230. The seed suction holes 230 are arranged in a circumferential pattern.

[0039] The rotating connector 300 is rotatably sleeved on the outer periphery of the central shaft 100, and the rotating connector 300 is connected and fixed to the seed metering roller sleeve 200.

[0040] An axial sealing structure 400 is installed between the outer peripheral wall of the central shaft 100 and the inner wall of the seed metering roller sleeve 200 to seal both sides of the negative pressure chamber 210 and the positive pressure chamber 220, thereby isolating the negative pressure chamber 210 and the positive pressure chamber 220 and preventing them from communicating. It is understood that axial sealing structures 400 are provided on both circumferential sides of the negative pressure chamber 210 and the positive pressure chamber 220, and one or more axial sealing structures 400 can be provided between the negative pressure chamber 210 and the positive pressure chamber 220.

[0041] The end sealing structure 500 is installed between the two ends of the seed metering roller sleeve 200 and the central shaft 100; it is used to seal the two ends of the negative pressure chamber 210 and the positive pressure chamber 220. The axial sealing structure 400 and the end sealing structure 500 provide a complete seal around the negative pressure chamber 210 and the positive pressure chamber 220, ensuring the airtightness of the chambers.

[0042] In a preferred embodiment of this utility model, a seed metering roller structure is provided. By setting a negative pressure groove 110 and a positive pressure groove 120 on the central shaft 100, as well as corresponding negative pressure chambers 210 and positive pressure chambers 220, the seeds can be smoothly discharged by positive pressure after being adsorbed, effectively avoiding seed blockage at the seed suction port 230. This solves the problem of seed interruption caused by seed blockage in the prior art and significantly improves the continuity and uniformity of sowing. Furthermore, the absence of a complex positive pressure seed metering device, the fit between the seed metering roller sleeve 200 and the central shaft 100, along with the rotating connector 300, simplifies the air duct layout. Both ends of the central shaft can connect to the air duct, avoiding interference from other structures. Additionally, the central shaft 100 does not rotate, thus avoiding rotation of the air duct and eliminating the need to consider rotation-related issues. This simplifies installation and maintenance, reducing production costs and equipment failure rates. The axial sealing structure 400 and end sealing structure 500 effectively seal both sides and ends of the negative pressure chamber 210 and the positive pressure chamber 220, ensuring a stable supply of negative and positive pressure airflow. This further improves the accuracy and reliability of seed metering, guaranteeing sowing quality. The negative pressure groove 110 and positive pressure groove 120 are circumferentially spaced, allowing the seed metering roller to continuously adsorb and discharge seeds during rotation, significantly improving seed metering efficiency and meeting the high efficiency requirements of modern agricultural production. The seed metering speed can be controlled by adjusting the rotation speed of the seed metering roller sleeve 200.

[0043] Reference Figure 2 and Figure 5 In some embodiments of this utility model, the central shaft 100 includes a central section 130 and journals 140 located at both ends of the central section 130; the diameter of the journals 140 is smaller than that of the central section 130; a negative pressure groove 110 and a positive pressure groove 120 are located on the periphery of the central section 130; two rotating connectors 300 are provided to be connected and fixed to both ends of the seeding roller sleeve 200 respectively, and the two rotating connectors 300 are respectively rotatably sleeved on the two journals 140, and a bearing 141 is installed between the rotating connectors 300 and the periphery of the journals 140, thereby reducing rotational friction. In addition, rotating the rotating connectors 300 on the journals 140 can reduce the overall diameter.

[0044] Reference Figure 2 and Figure 4 In some embodiments of this utility model, a connecting protrusion 310 is provided in the middle of the outer peripheral wall of the rotary connector 300, and one end of the rotary connector 300 is embedded in the seed metering roller sleeve 200, thereby ensuring the coaxiality accuracy of the rotary connector 300 and the seed metering roller sleeve 200. The connecting protrusion 310 and the seed metering roller sleeve 200 are provided with corresponding holes at their ends for connection and fixation by fasteners, thereby realizing the connection and fixation of the rotary connector 300 and the seed metering roller sleeve 200.

[0045] Reference Figure 4 In a further embodiment of this utility model, the end of the rotary connector 300 away from the seed metering roller sleeve 200 is provided with an inwardly extending outer retaining ring 320 to axially limit the bearing 141 and prevent the bearing 141 from disengaging from the rotary connector 300. Furthermore, a rotary connector 300 is provided on each side, and the outer retaining rings 320 on both sides also achieve axial positioning of the seed metering roller sleeve 200, ensuring stable axial positions of the seed metering roller sleeve 200 and the seed suction hole 230, preventing significant axial displacement.

[0046] Reference Figure 4 In a further embodiment of this utility model, the outer periphery of the end of the central segment 130 is provided with an outwardly concave conical surface 131, and the outer end of the conical surface 131 is connected to a cylindrical segment 132. The end sealing structure 500 is a sealing ring sleeved on the cylindrical segment 132. The inner peripheral wall of the sealing ring has a contact surface 510 that fits with the conical surface 131. A sealing ring retainer 150 is provided between the central segment 130 and the end of the rotary connector 300. The sealing ring retainer 150 abuts against the sealing ring, thereby providing axial preload to the sealing ring. Combined with the conical surface 131 and the contact surface 510, the conical surface 131 and the contact surface 510 fit tightly together, ensuring sealing performance.

[0047] Reference Figure 4 In a further embodiment of the present invention, the inner ring of the sealing ring retainer 150 is provided with a bearing abutment portion 151 extending toward the outer retainer 320. The bearing abutment portion 151 abuts against the inner ring of the bearing 141, thereby achieving axial positioning of the bearing 141 and avoiding contact with the outer ring of the bearing 141, thus reducing rotational friction.

[0048] Reference Figure 4 In a further embodiment of this utility model, one of the rotating connectors 300 is provided with a transmission tooth 330, which facilitates transmission connection with an external power input mechanism, thereby driving the rotating connector 300 and the seed metering roller sleeve 200 to rotate together to achieve seed metering.

[0049] Reference Figure 1 and Figure 2In a further embodiment of this utility model, a connecting seat 600 is further included. The connecting seat 600 has a connecting plate at its upper end for fixing to the frame of the seed metering machine. A threaded shaft section 142 is provided at the outer end of the journal 140. A limiting plane 143 is provided on the outer periphery of the threaded shaft section 142. The connecting seat 600 has a sleeve hole 610 fitted into the threaded shaft section 142. The sleeve hole 610 has a limiting side 611 adapted to the limiting plane 143, thereby achieving circumferential fixation between the connecting seat 600 and the journal 140 of the central shaft 100, preventing the central shaft 100 from rotating relative to the connecting seat 600, thus ensuring circumferential fixation of the central shaft 100 when installed on the frame of the seed metering machine. A limiting nut 144 is threadedly connected to the threaded shaft section 142. The limiting nut 144 is located on the outside of the connecting seat 600 to axially limit the connecting seat 600, thereby achieving connection and fixation between the connecting seat 600 and the journal 140.

[0050] Reference Figure 5 and Figure 6 In a further embodiment of this utility model, the outer peripheral wall of the central section 130 is provided with sealing grooves 160 on both sides of the negative pressure groove 110 and the positive pressure groove 120. The axial sealing structure 400 is a sealing strip embedded in the sealing groove 160. The axial sealing structure 400 is positioned and installed through the sealing groove 160 to ensure stable installation position.

[0051] Reference Figure 5 and Figure 6 In a further embodiment of the present invention, the sealing groove 160 extends to the conical surface 131 and the cylindrical section 132, thereby ensuring that the sealing range of the axial sealing structure 400 is sufficient and intersects with the end sealing structure 500 to ensure the sealing performance at the intersection of the axial sealing structure 400 and the end sealing structure 500.

[0052] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A seed roll shaft structure, characterized by, The utility model relates to a seed sowing roller, which comprises a central shaft (100) with a negative pressure groove (110) and a positive pressure groove (120) recessed inward and arranged at intervals in the circumferential direction, a negative pressure channel (111) and a positive pressure channel (121) extending towards the center and arranged at the two ends of the central shaft (100) respectively, a seed sowing roller sleeve (200) sleeved on the outer periphery of the central shaft (100), a negative pressure cavity (210) formed by the seed sowing roller sleeve (200) and the negative pressure groove (110), a positive pressure cavity (220) formed by the seed sowing roller sleeve (200) and the positive pressure groove (120), and a plurality of seed suction holes (230) arranged on the circumferential wall of the seed sowing roller sleeve (200). A rotary connecting piece (300) is rotatably sleeved on the outer periphery of the central shaft (100) and fixedly connected with the seed sowing roller sleeve (200). An axial sealing structure (400) is arranged between the outer circumferential wall of the central shaft (100) and the inner wall of the seed sowing roller sleeve (200) to seal the two sides of the negative pressure cavity (210) and the positive pressure cavity (220). An end sealing structure (500) is arranged between the two ends of the seed sowing roller sleeve (200) and the central shaft (100) to seal the two ends of the negative pressure cavity (210) and the positive pressure cavity (220). The central shaft (100) comprises a central section (130) and a shaft neck (140) arranged at the two ends of the central section (130), the diameter of the shaft neck (140) is smaller than that of the central section (130), the negative pressure groove (110) and the positive pressure groove (120) are arranged on the circumferential wall of the central section (130), the rotary connecting piece (300) is provided with two connecting convex rings (310) arranged at the two ends of the seed sowing roller sleeve (200) respectively, the two rotary connecting pieces (300) are rotatably sleeved on the two shaft necks (140) respectively, and a bearing (141) is arranged between the rotary connecting piece (300) and the circumferential wall of the shaft neck (140). The rotary connecting piece (300) is provided with a connecting convex ring (310) arranged on the middle part of the outer circumferential wall, one end of the rotary connecting piece (300) is partially embedded in the seed sowing roller sleeve (200), and the connecting convex ring (310) and the end of the seed sowing roller sleeve (200) are provided with corresponding hole positions to be fixedly connected by fasteners.

2. The seed roll shaft structure of claim 1, wherein, The end of the rotary connecting piece (300) away from the seed sowing roller sleeve (200) is provided with an inwardly extending outer retaining ring (320).

3. The seed roll shaft structure of claim 2, wherein, The outer periphery of the end of the central section (130) is provided with an outwardly folded conical surface (131), the outer end of the conical surface (131) is connected with a cylindrical section (132), the end sealing structure (500) is a sealing ring sleeved on the cylindrical section (132), the inner circumferential wall of the sealing ring is provided with a fitting surface (510) matched with the conical surface (131), a sealing ring retaining ring (150) is arranged between the end of the central section (130) and the rotary connecting piece (300), and the sealing ring retaining ring (150) abuts against the sealing ring.

4. The seed roll shaft structure of claim 3, wherein, ​ 5. The seed roll shaft structure of claim 4, wherein, ​ 6. The seed roll shaft structure of claim 5, wherein, The sealing ring retainer (150) is provided with a bearing abutting portion (151) extending towards the outer retainer (320), and the bearing abutting portion (151) abuts with the inner ring of the bearing (141).

7. The seed roll shaft structure of claim 2, wherein One of the rotary connectors (300) is provided with a transmission tooth portion (330).

8. The seed roll shaft structure of claim 2, wherein, Further comprising a connecting seat (600), the shaft journal (140) is provided with a threaded shaft segment (142) at the outer end, the threaded shaft segment (142) is provided with a limiting plane (143) on the outer periphery, the connecting seat (600) is provided with a sleeve hole (610) sleeved on the threaded shaft segment (142), the sleeve hole (610) is provided with a limiting side (611) matched with the limiting plane (143), the threaded shaft segment (142) is threadedly connected with a limiting nut (144), and the limiting nut (144) is arranged outside the connecting seat (600) to axially limit the connecting seat (600).

9. The seed roll shaft structure of claim 5, wherein, The outer peripheral wall of the central segment (130) is provided with a sealing groove (160) on both sides of the negative pressure groove (110) and the positive pressure groove (120), and the axial sealing structure (400) is a sealing strip embedded in the sealing groove (160).

10. The seed roll shaft structure of claim 9, wherein, The sealing groove (160) extends to the conical surface (131) and the cylindrical segment (132).

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