CONTROL METHOD OF ELECTRIC DRIVE OF EXCAVATOR BUCKET OPENING Russian patent published in 2019 - IPC E02F9/20 E02F3/43 E02F3/46 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and is intended for use on quarry excavators to improve the reliability of the excavator bucket opening mechanism when loading rock. In electric DC drive by means of setting device 17 angular speed setting equal to rated angular speed of electric motor is always set. In the initial moment of the drive operation, a restriction corresponding to the cable pulling current is installed in the controlled limitation unit 11. When control button 7 in unit 11 is switched on, maximum current limitation value is set. As a result, current and electromagnetic motor torque proportional to it increase sharply. This results in withdrawal of retainer 23 and opening of bottom 22 of bucket 24 of excavator. Current of armature winding 16 is increased up to value exceeding moment of resistance of mechanism holding retainer 23. Sharp reduction of load and, hence, current of electric motor is performed after pulling of retainer 23. Bottom 22 of ladle 24 opens under action of content and rock is unloaded. At that, electric drive only winds cable 20 on drum 19 at low load. When the current reaches the threshold level specified by threshold element 2, a constraint corresponding to the pull-up current of the cable is set in the controlled limitation unit 11.

EFFECT: loading of excavator bucket bottom opening mechanism takes place only when retainer is pulled.

1 cl, 2 dwg