Air suction-type seed-metering device capable of preventing seed blockage at seed-sucking holes

Abstract

The invention discloses an air suction-type seed-metering device capable of preventing seed blockage at seed-sucking holes. The air suction-type seed-metering device capable of preventing the seed blockage at the seed-sucking holes structurally comprises a connecting fixing plate, a seed blockage-preventing air suction-type seed-metering unit, a seed-metering pipe and a seed-guiding pipe, whereinthe seed blockage-preventing air suction-type seed-metering unit is fixedly mounted at the front end of the connecting fixing plate; the seed-metering pipe is arranged at the bottom end of the seed blockage-preventing air suction-type seed-metering unit; the seed-guiding pipe is mounted at the upper end of the inner part of the seed blockage-preventing air suction-type seed-metering unit in an embedded way; seeds are absorbed in vacuum through protective seed-sucking holes in a seed blockage-preventing vacuum seed-sucking rotary disk and are driven by an outer rotary disk to rotate, the vacuumpressure at the protective seed-sucking holes at the upper end of the seed-metering pipe disappears when the seeds rotate to the upper end of the seed-metering pipe, and a seed pushing plate works toapply pushing force to the seeds so as to guarantee that the seeds fall into the seed-metering pipe, so that missing sowing is avoided; meanwhile, the other seeds are scraped by a self-adjusting seedscraper, a sliding pusher on the self-adjusting seed scraper works to drive a scraping squeezing plate to scrape off the seeds, so that hard collision is avoided, occurrence of a crumbing situation of the seeds is reduced, and the seeds are protected.

Description

technical field [0001] The invention relates to the field of pneumatic seed metering devices, in particular to an air-suction seed metering device for preventing seed jams. Background technique [0002] Pneumatic precision seed metering devices mainly include three types: air pressure type, air blowing type, and air suction type. The development trend of air suction precision seed metering devices is that it is not necessary to select and classify seeds on the premise of ensuring the quality of the seeds. , so the usage rate is high, but the current air suction seed metering device has the following disadvantages: [0003] The air-suction seed metering device adopts a certain pressure difference formed on both sides of the seed metering disc. Under the action of the pressure difference, the seeds are adsorbed on the seed suction holes, and when they rotate to the sowing place, the adsorption pressure disappears, and the seeds fall into the air through the weight of the seeds...

AI Technical Summary

Problems solved by technology

[0003] The air-suction seed metering device adopts a certain pressure difference formed on both sides of the seed metering disc. Under the action of the pressure difference, the seeds are adsorbed on the seed suction holes, and when they rotate to the sowing place, the adsorption pressure disappears, and the seeds fall into the air through the weight of the seeds themselves. Seeds are sown inside the seed ditch. Because the seeds have not been selected and graded, the sizes of the seeds are different. In order to reduce the void rate and increase the adsorption pressure, this will cause small-sized seeds to be stuck on the seed suction hole and reach the sowing place. Adsorption cannot fall, resulting in missed cultivation; and in order to ensure that the reseeding rate is reduced, the seed scraper inside the air suction seed metering device is prone to hard collisions with other seeds when scraping around the seed suction hole. Causes the scraper to crush the seeds, destroying the seeds

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