DEMAG DRF 200, Assembly Instructions Manual

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4 Technical description
4.1 Design
The friction wheel with HydroPUR tyre is driven via a gearbox and electric motor.
The gearbox of the DRF 200 is a 3-stage spur wheel gearbox. The gearbox housing is designed in such a way
that it can be fitted direct to the relevant trolleys.
The motor shaft features a tapered opening. The pinion bonded into the tapered opening transfers the motor tor‐
que to the gearbox.
4.2 Motor
The drive is an electric motor. The equipment is designed in accordance with the VDE regulations. The type of
enclosure is IP 55. Refer to the relevant motor operating instructions for further details.
4.3 Trolley
Fig. 5
The trolley has been specially developed as a tractor trolley for the
DRF 200 friction wheel travel drive.
The drive unit has been developed as a component particularly for I-
beam girders and box-section girders that have parallel flanges for
flange thicknesses from 10 mm to 30 mm. The flange width range from
82 mm to 300 mm (100 mm - 300 mm for travel on curved tracks) is
covered by load bar pins on four different lengths; fine adjustment can
be achieved by means of spacer rings.
The trolley has only one polyamide travel wheel on each side to ensure
that the unit can travel on curved tracks and to enable transfer to a gra‐
dient radius.
Lateral guidance of the trolley on the girder section is ensured by by
two polyamide guide rollers on each trolley side cheek.
Tilting of the trolley caused by acceleration and braking is prevented by anti-tilt rollers. A certain amount of play is,
however, necessary in order to avoid positive guidance. The special design of the deep-drawn side cheek en‐
sures that the trolley has both an anti-derailment feature as well as an integral drop stop.
The use of a guide arm for travel on curved tracks enables the trolley to travel through a horizontal curve radius of
approx. 800 mm and a vertical gradient radius of approx. 2000 mm.
The maximum travel speed in both horizontal and vertical curves must not exceed 10 m/min. For curve-negotiat‐
ing trolleys, we recommend the use of a pole-changing motor and selection of the lower speed for travel on
curved track.
In this case, the anti-tilt guide rollers are not fitted in the trolley side cheek. The function of these rollers is then
provided by the anti-tilt guide rollers of the curve travel guide arm.
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