Seeding mechanism of air suction type seed sowing device

Abstract

The utility model belongs to seeding instruments, and particularly relates to a seeding mechanism of an air suction type seed-metering device. The outer port of the hollow main shaft can be communicated with the output end of a fan, the inner port of the hollow main shaft is opened at the rear side of a sucker through an air suction chamber cover, the outer end of the hollow main shaft is fixedly provided with a fixed seat matched with a roller bracket, and the sucker with a seed suction hole is hermetically assembled on the inner surface of the air suction chamber cover; a first bearing sleeve is in coaxial sealing running fit with a hollow main shaft on the outer side of a seed-metering device inner shell, a disc capable of being connected with a roller is coaxially fixed to the first bearing sleeve, the inner end of the first bearing sleeve is coaxially fixed to an air suction chamber inner cover, and a second bearing sleeve with the inner end coaxially fixed to the seed-metering device inner shell is in coaxial sealing running fit with the outer surface of the first bearing sleeve. And the spring clamping sheet enables an air cut valve capable of closing the surface of the seed suction hole to be attached to and pressed against the surface of the sucker. The utility model solves the problems in the prior art that dust easily enters the bearing to cause faults, seeds are easily damaged and the like, and has the advantages that the seeds are not easily damaged, the operation is stable, the fault rate is low and the like.

Description

Technical Field

[0001] This utility model pertains to seeding equipment, specifically referring to the seeding mechanism of a pneumatic seed metering device. Background Technology

[0002] Patent application number 201320853491.5 discloses a pneumatic seed metering device. Its hollow main shaft rotates, and the inner shell and suction nozzle are assembled to the outer surface of the hollow main shaft via bearings. The seeding mechanism works by a seed-feeding paddle that naturally pushes the seeds into an inoculation box between the drum and the outer shell. The inoculation box then feeds the seeds into a duckbill on the surface of the drum. As the duckbill contacts the ground, the seed-feeding cap opens naturally under ground pressure, dropping the seeds into the ground, thus completing the sowing. The existing technology has two main problems: First, the paddle action easily damages the seed coat and / or breaks the seeds, especially for single-seed sown crops. This can result in empty planting holes and even poor or no harvest, affecting crop yield. Second, because the hollow shaft is under negative pressure, the suction nozzle carries dust, which can easily damage the bearings, especially in windy and dusty areas during spring, greatly hindering the smooth sowing process. Utility Model Content

[0003] The purpose of this invention is to provide a seed-feeding mechanism for an air-suction seed metering device that is less likely to damage seeds, operates smoothly, and has a low failure rate.

[0004] The overall technical concept of this utility model is:

[0005] The seed-feeding mechanism of the air-suction seed metering device includes a hollow main shaft with an outer port that can be connected to the output end of a blower. The inner port of the hollow main shaft opens to the rear side of the suction cup through the inner cover of the air-suction chamber. A fixed seat that can be adapted to the roller bracket is fixed to the outer end of the hollow main shaft. The suction cup with a seed suction hole is sealed and fitted on the inner surface of the inner cover of the air-suction chamber. The device also includes a first bearing sleeve that is coaxially and rotatably fitted with the hollow main shaft on the outer side of the inner shell of the seed metering device. A disc for connecting the roller is coaxially fixed on the first bearing sleeve. The inner end of the first bearing sleeve is coaxially and rotatably fitted with the inner cover of the air-suction chamber. A second bearing sleeve is coaxially and rotatably fitted with the outer surface of the first bearing sleeve on the outer side of the inner shell of the seed metering device. The inner end of the second bearing sleeve is coaxially and fixed with the inner shell of the seed metering device. The top of the spring clip presses against the suction cup surface to form a closed air shut-off valve on the surface of the seed suction hole. The end of the spring clip is fixed to the inner end face of the hollow main shaft.

[0006] Other specific technical solutions of this utility model include:

[0007] To ensure flexible relative rotation between the first bearing sleeve and the hollow spindle, and to prevent dust from entering the bearing, the preferred technical means is that the hollow spindle is rotatably assembled with the first bearing and the first bearing sleeve, which are spaced apart along the axial direction. A first sealing ring and a second sealing ring, which are isolated from the outside, are respectively provided on the outer side of the second bearing and the first bearing.

[0008] To ensure flexible relative rotation between the first and second bearing sleeves and to prevent dust from entering the bearing, the preferred technical solution is that the second bearing sleeve rotates with the first bearing sleeve through a third bearing, and the outer end of the third bearing is provided with a sealing dustproof steel gasket.

[0009] The technological advancements achieved by this utility model are as follows:

[0010] 1. The rotation of the suction cup drives the inner cover of the air suction chamber to rotate, and the air cut-off valve realizes the opening and closing operation of the seed suction hole, which effectively avoids the defect of existing equipment that is prone to seed damage and improves the sowing success rate.

[0011] 2. The hollow spindle rotates relative to the air suction chamber cover through bearings, effectively preventing dust from entering and significantly reducing the failure rate.

[0012] 3. The structural design of the first and second sealing rings and the sealing dustproof steel gasket effectively extends the device's resistance to wind and sand, ensuring stable and reliable operation of the device. Attached Figure Description

[0013] The accompanying drawings of this utility model are as follows:

[0014] Figure 1 This is the front view of this utility model.

[0015] Figure 2 yes Figure 1 The CC view.

[0016] Figure 3 This is a three-dimensional sectional view of the present invention.

[0017] Figure 4 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 5 This is a schematic diagram of the structure of this utility model after being assembled with the suction cup of the seeder.

[0019] Figure 6 This is a three-dimensional sectional view of the present invention after being assembled with the seeder suction cup.

[0020] The attached figures are labeled as follows:

[0021] 1. Inner cover of the air suction chamber; 2. Inner shell of the seed metering device; 3. Third bearing; 4. Second bearing; 5. First bearing; 6. Sealing dustproof steel pad; 7. First sealing ring; 8. Second sealing ring; 9. Main shaft fixing seat; 10. First bearing sleeve; 11. Second bearing sleeve; 12. Disc; 13. Air shut-off valve; 14. Hollow main shaft; 15. Suction cup; 16. Spring clip. Detailed Implementation

[0022] The embodiments of the present invention will be further described below with reference to the accompanying drawings, but this is not intended to limit the present invention. The scope of protection of the present invention shall be determined by the contents of the claims. Any equivalent technical means substitution made in accordance with the description shall not depart from the scope of protection of the present invention.

[0023] The overall structure of this embodiment is shown in the figure. It includes a hollow main shaft 14 whose outer port can communicate with the output end of a blower. The inner port of the hollow main shaft 14 opens to the rear side of the suction cup 15 through the inner cover 1 of the air suction chamber. A fixing seat 9, which can be adapted to the roller bracket, is fixed to the outer end of the hollow main shaft 14. A suction cup 15 with a seed suction hole is sealed and fitted onto the inner surface of the inner cover 1 of the air suction chamber. It also includes a first bearing sleeve 10 that is coaxially and rotatably fitted with the hollow main shaft 14 on the outer side of the seed metering device inner shell 2. The first bearing sleeve 10 has the same... A disc 12 for connecting the roller is fixed to the shaft. The inner end of the first bearing sleeve 10 is coaxially fixed to the inner cover 1 of the air suction chamber by bolts. The outer surface of the first bearing sleeve 10 on the outer side of the seed metering device inner shell 2 is coaxially sealed and rotatably fitted with a second bearing sleeve 11. The inner end of the second bearing sleeve 11 is coaxially fixed to the inner shell 2 of the seed metering device. The top of the spring card 16 presses against the surface of the suction cup 15 with the air cut-off valve 13 that can form a seal on the surface of the seed suction hole. The end of the spring card 16 is fixed to the inner end face of the hollow main shaft 14 by bolts.

[0024] The hollow spindle 14 is rotatably assembled with the first bearing sleeve 10 via the second bearing 4 and the first bearing 5, which are spaced apart along the axial direction. The second bearing 4 and the first bearing 5 are respectively provided with a first sealing ring 7 and a second sealing ring 8 that are isolated from the outside.

[0025] The second bearing sleeve 11 is rotatably engaged with the first bearing sleeve 10 through the third bearing 3, and the outer end of the third bearing 3 is provided with a sealing dustproof steel pad 6.

[0026] This embodiment works as follows:

[0027] In use, the end opening of the hollow main shaft 14 is connected to the output end of the blower, the disc 12 is connected to the drum, and the fixed seat 9 is assembled with the drum bracket. Under the traction of the tractor, the drum bracket drives the drum, the first bearing sleeve 10, the air suction chamber cover 1, the suction cup 15, and the seed winch to rotate in the same circle. The hollow main shaft 14, the spring card 16, and the air cut-off valve 13 are relatively stationary. During the rotation, the seeds are naturally adsorbed onto the seed suction hole. The seed separation and seed discharge are consistent with the structure and working principle in the patent document with application number 201320853491.5. The air cut-off valve 13 is pressed against the surface of the suction cup 15 under the action of the spring card 16. When the air cut-off valve 13 passes through the seed suction hole, it closes the seed suction hole. The seeds lose suction and fall naturally into the inoculation box between the drum and the outer shell. Then, the seeds are put into the duckbill on the surface of the drum from the inoculation box. When the duckbill contacts the ground, the seed-feeding cover opens naturally under the ground pressure, putting the seeds into the ground, thus completing the sowing.

Claims

1. A seed-feeding mechanism for a pneumatic seed metering device, comprising a hollow main shaft (14) whose outer port can be connected to the output end of a blower, an inner port of the hollow main shaft (14) opening through an inner cover (1) of the pneumatic suction chamber onto the rear side of a suction cup (15), a fixing seat (9) adapted to a roller bracket being fixed to the outer end of the hollow main shaft (14), and a suction cup (15) with a seed suction hole being sealed and fitted on the inner surface of the inner cover (1); characterized in that It also includes a first bearing sleeve (10) that is coaxially sealed and rotates with the hollow main shaft (14) on the outside of the seed metering device inner shell (2). A disc (12) for connecting the roller is coaxially fixed on the first bearing sleeve (10). The inner end of the first bearing sleeve (10) is coaxially fixed with the inner cover (1) of the air suction chamber. The outer surface of the first bearing sleeve (10) on the outside of the seed metering device inner shell (2) is coaxially sealed and rotates with a second bearing sleeve (11). The inner end of the second bearing sleeve (11) is coaxially fixed with the seed metering device inner shell (2). The top of the spring card (16) presses the air cut-off valve (13) that can form a seal on the surface of the seed suction hole against the surface of the suction cup (15). The end of the spring card (16) is fixed to the inner end face of the hollow main shaft (14).

2. The seeding mechanism of the pneumatic seed metering device according to claim 1, characterized in that... The hollow spindle (14) is rotatably assembled with the first bearing sleeve (10) through the second bearing (4) and the first bearing (5) arranged axially at intervals. The second bearing (4) and the first bearing (5) are respectively provided with a first sealing ring (7) and a second sealing ring (8) that are isolated from the outside.

3. The seeding mechanism of the pneumatic seed metering device according to claim 1, characterized in that... The second bearing sleeve (11) is rotatably engaged with the first bearing sleeve (10) through the third bearing (3), and the outer end of the third bearing (3) is provided with a sealing dustproof steel pad (6).

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