MECHANISMS FOR DRAWING A CHAIN INTO OR THROUGH A CHANNEL OF A CHAIN GUIDE

摘要

A retraction mechanism for drawing a plough drive chain into a chain channel of a coal plough guide built onto the side of a scraper chain conveyor comprises a retraction slide which can be drawn through the chain channel and guided. The plough chain is connected to the slide which, via a chain section and a chain claw can be connected to an external traction drive, preferably to the scraper chain assembly of the scraper chain conveyor, so that the mechanism can draw the plough drive chain through the chain channel. The traction chain incorporates an overload clutch which limits the traction force. The clutch has two complementary parts one of which has a detent ball pressed by a prestressed spring into a detent recess of the other clutch part, so that the clutch is closed. A releasable lock or fixing device secures the detent ball in its released position.