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21491244.p65/201204
5.2 DFW-L-L travel unit
overview
Demag travel units as driven rail-mounted travel units of compact design can be
connected direct to load-bearing structures.
The travel unit girder, designed on the basis of the latest findings, consists of a box
girder profile resistant to torsion with welded diaphragm plates. Low tolerances for
differences in the runway gauge, skewing and misalignment provide for excellent
travel characteristics, even at high loads.
Each of the two travel wheels of the travel unit is mounted in a wheel block. One
of the two wheel blocks can be driven by a Demag travel drive (offset gearbox +
motor).
Specially matched Demag squirrel-cage rotor brake motors ensure smooth starting
of the travel unit, whether with or without a load, with favourable speed/torque
characteristics.
Only perfect crane alignment geometry ensures good operating characteristics of
the crane. Thus, in order to maintain the manufacturing accuracy once reached, the
assembly of travel units and crane girder must be carried out carefully.
The contact surface on the travel unit and crane girder as well as the bore holes for
the bolted connection must be free of rust, dust, grease, paint and other contami-
nants.
For the bolted connection only high-tensile (HT) bolts M16 may be used and tight-
ened with the corresponding tightening torque (see bolted connection).
For the welded connection the travel units and the crane girder must be aligned
paralel to each other. No air gap may be added, when the components are welded
together.
Assembling the travel unit/supporting
structure
21433002.eps
21433001.eps
3
Crane girder
HT nut
DIN 6915
HT bolt
DIN 6914
Crane girder
Bolted connection
For crane girder HE-A 180 to 280:
HT bolt: M16x50 DIN 6914 Part no.: 316 091 99
For crane girder HE-A 300 to 400:
HT bolt: M16x55 DIN 6914 Part no.: 316 095 99
For crane girder HE-A 450 to 550:
HT bolt: M16x65 DIN 6914 Part no.: 316 060 99
For crane girder HE-A 180 to 550:
HT nut: M16 DIN 6915 Part no.: 316 207 99
HT washer: 17x30x4 DIN 6916 Part no.: 316 211 99
Only the parts included in the supply may be used for the connection. Tighten
diagonal pairs of all screws using a torque wrench.
Tightening torque: 284 Nm
HT bolt
DIN 6916
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