Pneumatic-mechanical combined seed-metering device

Abstract

The invention discloses a pneumatic-mechanical combined seed-metering device and relates to the field of agricultural machinery. Cooperated seed picking and mechanical seed carrying is achieved by combining seed-picking and seed-carrying principles of pneumatic and mechanical seed-metering devices. The pneumatic-mechanical combined seed-metering device comprises a seed suction device, a seed carrier and a seed protector, wherein the seed suction device comprises a seed-metering disc and bumps; the outer periphery of the seed-metering disc is provided with an inverted-trapezoidal rail; the bumps are distributed evenly in the inverted-trapezoidal rail; the seed carrier is composed of a seed-metering disc, bumps and a seed protective plate; the inner side of the seed protective plate is provided with a rectangular seed-protecting rail, and the rectangular seed-protecting rail and a trapezoidal rail of the seed-metering disc form a seed-metering passage. The pneumatic-mechanical combined seed-metering device adapts to sizes of seeds effectively; seeds are picked cooperatively through vacuum jets and mechanical bumps, mobility of the seeds is enhanced, and seed-picking effect is improved; hole vacuum suction is absent from a highest point of a seed-carrying region; the seeds slide to the former bump along the seed-metering passage under the action of gravity; mechanical seed-carrying seed-feeding process is achieved; the seed-metering process is more stable, seed-carrying effect is improved, the requirement on negative pressure is low, negative pressure energy consumption can bereduced effectively, and seed metering qualification rate is increased.

Description

technical field [0001] The invention belongs to the field of agricultural machinery, and in particular relates to a pneumatic mechanical composite seed metering device suitable for seeds with large and medium particle sizes such as peanuts, soybeans and cotton. Background technique [0002] Precision sowing has the advantages of saving time, saving seeds, saving labor, and facilitating field management. Mechanized precision sowing has been widely used as the main method of planting peanuts, cotton and other crops. Seed metering device is the core component of precision sowing technology, and its working performance directly affects the quality of sowing. Existing seed meters are mainly divided into two categories: mechanical and pneumatic. The mechanical seed metering device is simple in structure and low in price, so it is widely used by farmers, but it has high requirements on the shape and size of seeds, and the filling accuracy is not high, it is difficult to control th...

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Problems solved by technology

The mechanical seed metering device is simple in structure and low in price, so it is widely used by farmers, but it has high requirements on the shape and size of seeds, and the filling accuracy is not high, it is difficult to control the number of filling seeds each time, and it is difficult to achieve high-speed operation; When the air-suction seed meter is working, it uses negative pressure airflow to adsorb the seeds on the hole of the seed tray. It has good applicability to the shape and size of the seeds and is easy to achieve high-speed operation. The adsorbed seeds fall from the holes, and when there are many holes and large holes working at the same time, the fan power requirements are relatively high and the energy consumption

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