The skip-car control mechanism utilised to date included two mechanical, geared cam limit switches, which require a lot of time to program. The mechanical overspeed switch utilized can prove problematical when subjected to shock and vibration loads. Neither of these components exhibit the required precision and as such are not suitable to meet the modern-day requirements of steel mill operations.
Inclined converter hoist
Upgrading to meet modern demands required suitable components for measuring actual values that not only meet demands for high accuracy and operational reliability but are also easy to program.
Hübner Giessen replaced one of the geared cam limit switches with a series FG 4 K incremental encoder and an AMS 4 K type absolute encoder with integrated SSI interface. Fitting the devices to a bearing block increases their resistance to shock and vibration loads and compensates the mechanical tolerances of the installed transfer gearbox.
The other geared cam limit switch will also be replaced in a second upgrading step as will the mechanical overspeed switch by a programmable , electronics overspeed switch.