1. QD type double girder travel bridge cranes are mainly used in inside workshop. Its typical characters are
two main girders, and the hoisting mechanism is trolley.
2. QD type double girder travel bridge crane is a general bridge crane, the mother of double girder overhead
crane.Other special double girder overhead cranes are all designed or modified on the basis of this QD type crane.
3. QD type double girder travel bridge crane is normally divided into 3 working groups as per utilization
frequency and load condition: A5, A6  and A7.  
4. Operation is done inside cabinet or by remote control.
5. The cab can be either fixed at the left end or at the right end.
6. Safe slide wire or angle iron can be used for electric conduction of the crane, it can be either
at the opposite side of  the cab or at the same side of the cab. 
Product Structure:
1. Main girder of bridge crane
Bridge crane is a crane equipment which carries on the cross frame and workshop, the warehouse
and the material field. Because of its two ends located on the tall column of cement or metal stents,
shaped like a bridge, it is also called "crane" or "travelling crane".
2. Double girder crab of bridge crane
The crabs in the manufacturing plant have passed strict test.
3. Cabin of bridge crane
  -Glass window can make the operator see all the working condition and the cabs
       installed in the front and two sides.
  -As a group of independent cabin, fixed outside of cab is connected by control
     cable and linkage station which is set up in the cab.
4. Hooks of QD Type Double Girder Travel Bridge Cranes
   All of the hooks are designed with different lifting weight, according to international standard.