APPARATUS FOR CONTROLLING OPERATING QUALITY OF PNEUMATIC SEEDING UNITS Russian patent published in 2007 - IPC A01C7/04 

FIELD: agricultural engineering.

SUBSTANCE: apparatus has piezoelectric sensor, amplifier-signal generator and optical indicator. Sensor is positioned opposite suction opening movement path, at a distance not exceeding length of air flow jet. Locking bridge is introduced into amplifier-signal generator for connecting power source to electromagnet fixed on tines, within seeding unit casing. Spring-loaded spoon of dielectric material is located on the same tines. Tip of magnetically soft material is fixed at end of spoon rod. Spoon is arranged so that in its extreme lower position spoon is located under inlet window edge and in its extreme upper position it is pressed to seeding disk at circumference defined by centers of suction openings, behind working zone of piezoelectric sensor. Such construction allows operation of seeding unit to be adequately corrected in case of occurrence of unfilled dosing members without substantial changes in sowing mode.

EFFECT: improved operating characteristics of seeding unit and enhanced reliability in operation of apparatus.

3 dwg