2results about How to "Simple separability" patented technology

The application discloses a finger clamp type precision seed sowing device and belongs to the technical field of agricultural machinery. The seed sowing device comprises a shell, a finger clamp disc, a seed cleaning mechanism and a clutch mechanism. The finger clamp disc is circumferentially provided with a plurality of finger clamps with increased friction lines. The seed cleaning mechanism comprises a seed cleaning brush and a precision adjusting mechanism. Ten gear positions of seed cleaning distance can be adjusted by rotating an eccentric mechanism in a lateral adjustment hole. The clutch mechanism realizes quick on-off of power transmission by engaging or separating a gear tooth and a chain wheel protrusion. The application effectively reduces the heavy sowing and missing sowing rate by the adjustable seed cleaning mechanism, improves the working reliability and maintenance convenience by the wear-resistant finger clamp and the quick clutch design, and is especially suitable for high-speed precision sowing operation.

The application provides a method for improving the yield of 2,5-furan dicarboxylic acid, wherein a proper amount of Lewis acid salt is added in the reaction process of promoting the carboxylation reaction of 2-furan carboxylic acid and CO2 to generate 2,5-furan dicarboxylic acid by alkali metal carbonate; the Lewis acid salt and furan molecules are activated by adsorption coordination on H on the furan ring molecule, which is beneficial to promote the C-H deprotonation process of the furan ring molecule. The activation of the Lewis acid is utilized, and it is found that the Lewis acid and the alkali metal carbonate have a promoting effect in the carboxylation reaction of furfuryl acid and CO2, and have an improving effect on the yield of the reaction product 2,5-furan dicarboxylic acid.