Energy Feed Systems for Hoists in Motor Trolleys
German manufacturer J D Neuhaus (JDN) is marketing its range of energy feed systems for hoists in motor trolleys, monorail hoists and cranes. JDN‘s equipment is powered by compressed air, with the option of hydraulically powered products also available.
These power mediums ensure safe operation in areas where potentially explosive atmospheres can occur, such as in the oil and gas industry, refineries or chemical facilities. The products are also suitable for applications where high levels of inflammable dust can occur including mining, cement production and milling. Additional spark-resistant features can also be accommodated to cover ATEX Division 1 and 2 applications.
A variety of energy feed systems can be fitted to the JDN products where a permanent power supply is required for moveable trolley-mounted hoists or monorail hoists running on overhead support beams.
An economic spiral hose energy feed line can be supplied, supported by small trolleys running on galvanised square bar or C rails which are mounted to the upper flange of the overhead hoist beam. The spiral hose is supported on a plastic coated rope attached and tightened parallel to the main beam.
This is suitable for travel lengths of up to 10 metres, but it is recommended that the fully extended length of the spiral hose should always be 50 percent greater than the actual running length required. The spiral hose can be used in category 3 (zone 2), with gasses of explosion groups IIA and IIB. It should not be used in category 2 (zone 1) or group IIC applications.
CAD drawings show the energy chain for trolley drive and chain drive of overhead travelling cranes. The energy chain for trolley and crane drive of underslung cranes is realised by a vertical installation of the energy chain. The hose is fastened to trolleys, which roll directly on the bottom flange of the beam.