Internal-inflation positive-pressure combined seed metering device

Abstract

The invention discloses an internal-inflation positive-pressure combined seed metering device, which comprises a front shell body, a rear shell body, a seed metering disc, a seed discharging wheel anda seed metering shaft, wherein a plurality of combined holes formed by filling grooves and inoculation holes are uniformly distributed on the wall thickness of the seed metering disc along the circumferential direction; an air hole is formed in the groove bottom of the filling groove of each the combined hole; an air hole channel is formed in the seed metering disc at the position of each air hole; each the air hole channel comprises a bent channel and a transversely-arranged straight channel; an arc-shaped through hole is formed in the edge of a cover plate of the rear shell body; and the other end of the straight channel penetrates through the axial direction of the wall thickness of the seed metering disc and is connected with the arc-shaped through hole on the rear shell body and is communicated with the atmosphere through the arc-shaped through hole. The combination of the inner inflation type and the air pressure type is adopted, in the filling stage, seeds are filled into the filling grooves first, and then are pressed and attached to the air holes, and because the seeds filled into the filling grooves cannot slide out within a certain range under the restriction of the acting force and the depth dimension of the filling grooves, the time for the seeds in the filling grooves to be pressed and attached to the air holes is increased.

Description

Technical field [0001] The invention belongs to the technical field of seeding in agricultural machinery, and specifically relates to an internally charged positive pressure combined seed metering device. Background technique [0002] Precision seeding is an inevitable trend in the development of modern planting industry. It has the advantages of saving labor and cost, increasing crop yield and quality. The main factor to achieve precision seeding depends on the performance of the metering device. Precision seed metering device can be divided into mechanical type and pneumatic type according to its working principle. The mechanical seed metering device is simple in structure, low in cost, and convenient to use and maintain, but it has strict requirements on the shape and size of seeds, and has a high rate of damage to the seeds, which cannot meet high-speed precision seeding operations. At present, pneumatic seed metering devices are widely used in precision seeders at home and...

AI Technical Summary

Problems solved by technology

[0003] The filling method of the traditional pneumatic seed metering device is that the seeds are adsorbed or pressed on the stomata under the action of the airflow. Due to the interaction between the seeds, when entering the seed cleaning area, the seeds held on the stomata are generally close to the stomata in the seed group and For the seeds in the upper position, when the seeding disc is rotating at high speed, the filling time is short, and the adsorption or pressure adhesion performance is not good, which may easily lead to a high leakage filling rate.

Images