Patent ID: 8821694

Claim:
A method of positioning a piece of service equipment of a coal-charging larry cart at charging ports of a coke oven, the method comprising the steps of: moving a rail-guided larry cart in one direction on the roof of a coke oven and positioning it at locations known by a machine control system and corresponding to charging ports in the oven roof in order to charge the oven chambers; thereafter positioning the piece of service equipment of the coal-charging larry cart to the respective charging port by horizontal positioning movements in the one direction and in another direction; after each positioning of the larry cart, optically determining the coordinates of at least one marking that is applied to the oven roof at an offset and at a fixed spacing from the center of the respective charging port within a measurement field that is predefined by the measurement method and comparing the optically determined coordinates with reference values that are stored for this marking in the machine control system; and determining bidirectional deviations between the determined coordinates and the coordinates stored in the machine control system while taking the reference values into account during the bidirectional positioning movement of the piece of service equipment.