Description
Crane component
Main girder
Single girder bridge crane with one main girder or rolled or box type section
Two-girder bridge crane with one main girder of box-type section
Running-gear girder
Running gear girders consist of automatically welded box-type section. Geometrically exact whell positions are assured by mechanical treatment of the wheel bearings and the main girder connecting surfaces on cnc machining centers in one operation.
Cellular plastic buffers at the running-gear girder buffer plates provide for a soft absorption of the kinetic energy. The connection between main and running-gear girders consists of highly resistant screws which must be prestressed with a defined tightening torque.
Travelling mechanisms
Travelling mechanisms consist or directly driven running wheels with rolling bearing and lifetime lubrications. The whell body was cast of spheroidal cast iron, it has a low rate of wear and self-lubricating. The running wheel bearing is easy to install and maintenance-free.
Travelling gears
For details please refer to the operating instructions for travelling gears and the component lists for slip-on travelling gears.
Rail trolleys SWFcompact
Single-rail trolleys of standar and short type as well as two-rail trolleys SWFcompact with electric travelling mechanisms supported in rolling bearings.
The crane trolleys may be equipped with the foollowing lifting appliances:
SWF-electric chain hoists LK
SWF-electric cable pulls SWFcompact.
Power supply line
The cross sections for the power supply line from the sub-main distribution over the power supply switch to the contact wire supply are to be determined by the owner.
The power supply line must be rated so that the voltage at the contact wire supply does not drop to below the lower value of the voltage area without utilizing the 5% tolerance.
Power supply switch
The power supply switch is arranged outside the crane system which servers to separate the main power supply for the purpose or repair and maintenance operations. If required, this switch may also be used in case of EMERGENCY-OFF switchings or emergency stop.
You may purchase tjis accessory from SWF.
Isolating Switch
The task of the isolating switch, Viz. to disconnect the lifting appliance for maintenance and repair operations is realized via a main switch cabinet.
Crane switch (master contractor)
It is the task of the crane switch cabinet directly behind the main switch and realized by a contractor, to separate the energy supply to all movement drives in case of EMERGENCY STOP.
Contact wire
For the area of the trolleys, the SWF safety contact wire KSL will be used. Four copper bars, the contact wire is laid parallel to the trolley track by means of fastening brackets. Suspension distance ≤2000 mm.
AThe contact wire is determined by service conditions admissible thermal loads and admissible voltage drop.
Due to the starting currents of lifting appliance motors started across the line, the voltage drop must be carefully rated.
Switch cabinet
The switch cabinet is normally attached to the retaining arms of the power supply and has the enclosure IP 55.
The main fuse is designed as NH fusible cutout. At the primary and secondary ends, the control transformers is protected by a power circuit breaker according to the transformer power.
To prevent inching in the hoisting gear, a time lag (0,5 sec) is provided in front of the change-over contractors, motors and the mechanical system.
Switch cabinets are generally mounted with channel wiring on a mounting plate.
Crane travel limit switch
The so called preparatory power down, i.e reducing the speed to the slow running step is the usual procedure. Thus, the crane is prevented from running against the crane way bundary at high speed and the load from swinging heavily.
Final power down i.e braking down to standstill is provided in case of an increased safety risk or specially required safety connections. A limit switch for both travelling directions stops the respective travelling motion. Return is possible with the opposite travelling motion.
Movable control
The movement drives are controlled via two-stage keys with spring return. It is recommended to perform positioning tasks with the first stage. Frequent inching will damage motors and switching devices.
Through mechanical locking of the switching elements, simultaneous actuation of the control keys in opposite direction is prevented.
Pandent contol board
Operation
The pole-changing motor is controlled via the two-stage switching elements with safety noticeable switching points. A mechanical interlocking in the pendent control board prevents simultaneous actuation of two opposed moving directions.
Inching operations are forbidden. The result in heavy contact consumption and premature wear.
Emergency off
By means of the red mushroom key, the EMERGENCY OFF function demanded in VDEO100, part 726, is realized from the ground and from the operator’s location.
By depressing the mushroom key, EMERGENCY OFF is released, reclosing by turning to the left.
EMERGENCY-OFF must be released in case of the following operating conditons.
Whenever the movement drives of the more follow the normal control commands as a result of which dangers may be brought about.
Whenever the crane operator leaves the control stand.
EXCHANGING THE FUSES
The main fuse is designed as a fusible NH cutout. For screw plug fuses to be exchanged, screw out protection cap, exchange fusible plug, screw in proective cap again. The control circuit is earthed by a power circuit braker.
RADIO CONTROL
The reference points for the travelling directions of crane and trolley must be exactly coordinated for traveling cranes with remote radio control so as to assure safe crane operation.
For the radio control, the separate operating instructions of the manufacturer must be complied with.
Travelling cranes with remote radio control can be operated with the pendent control board as emergency control.
