SEEDING UNIT Russian patent published in 2006 - IPC A01C7/16 

FIELD: agricultural engineering, in particular, seed sowing technique.

SUBSTANCE: seeding unit has seeding disk, hopper with seeding slot, rotating curved scraper with rotation lever and shield fixed on hopper inner surface. Scraper is positioned opposite seeding slot and shield is located above seeding disk. Axis of rotation of scraper is axially aligned with seeding disk. Hopper has bottom arranged in spaced apart relation with respect to seeding disk. Bottom is made in the form of coil of annular straight helicoids, which is axially aligned with seeding disk and against which pins abut with their lower ends. Pins are located within through openings of seeding disk, with fixed space therebetween, and are spring-loaded relative to said disk. Shutter for seeding slot is secured on peripheral end of scraper. Shutter is oriented in direction of rotation of seeding disk and adjoins along arcuate line to hopper wall. Lines defining rows of pins and shield edge rear with respect to direction of rotation of seeding disk are formed as orthogonal projections of rear surface of scraper onto seeding disk and onto shield, respectively. Leading and tail parts of coil of annular straight helicoids are arranged in single vertical surface with rear edge of shield. Length of each pin is L=m+t+h-I, where L is length of pin; m is interval between seeding disk and point of support of the given pin upon end of annular straight helicoids coil; t is thickness of seeding disk; h is interval between seeding disk and shield; i is insurance gap between rear edge of shield and pin when said pin abuts against end of coil of annular straight helicoids. Helicoids coil pitch is equal to P=h/(1-α/360), where: P is pitch of annular straight helicoids coil; α is central angle corresponding to arcuate line of hopper wall between front edge of seeding slot and rear edge of shield.

EFFECT: uniform dosed feeding of difficult-to-flow seeding materials.

2 dwg