08-05-2014, 12:18 PM
assembly lifting jack system with four worm gear screw jacks, three bevel gear boxes:
Direction of rotation: Before starting installation work, the direction of rotation of all worm gear screw jacks, right angle bevel gear boxes and the drive motor must be checked with regard to the feed direction of each individual worm gear screw jack.
Alignment errors: All components must be carefully aligned during installation. Alignment errors and stresses increase power consumption and lead to overheating and premature wear. Before a drive unit is attached, each worm gear screw jack should be turned through its entire length by hand without load. Variations in the amount of force required and/or axial marks on the outside diameter of the screw indicate alignment errors between the worm gear screw jack and its additional guides. In this case, the relevant mounting bolts must be loosened and the worm gear screw jack turned through by hand again. If the amount of force required is now constant throughout, the appropriate components must be aligned. If not, the alignment error must be localized by loosening additional mounting bolts.
Test run: The direction of rotation of the complete system and correct operation of the limit switches must be checked again before attaching the drive motor. In the case of translating screw jack, check that the screw is lubricated with grease from the interior of the gear box and re-lubricate if necessary. In the case of travelling nut rotating screw jack, the jack screw should be coated with suitable grease to provide lubrication for lifting operation. The first test runs can then be carried out without load. A maximum operating time of 30 % can not be exceeded at trial runs under weight for worm gear screw jacks with trapezoidal screws.
Operation: The loads, speeds and operating conditions specified for the worm gear screw jacks and transmission components must not be exceeded even briefly.