The semi-goliath crane EHPK:
─ The semi-goliath crane travels on the building wall with the upper end carriage on a crane track. It runs to the centre of the building with the lower end carriage on the building floor.
─ The semi-goliath crane runs with the lower end carriage on a crane track which is recessed in the building floor or, depending on the maximum load capacity of the crane and condition of the building floor, directly on the floor itself.
─ The semi-goliath crane usually runs in the lower crane level beneath overhead travelling cranes.
─ The requirements of the semi-goliath crane with regard to the crane track on the building wall are less than those of a console travelling crane.
─ Despite its partially free-standing construction, the semi-goliath crane can be quickly and efficiently set up.
─ The semi-goliath crane is constructed from a welded, torsion-rigid box girder. All four outer welds are welded at the same time.
─ The crane is controlled using the pendant control “ABUCommander”. The pendant control has two-stage buttons with which the crane can be controlled at low and high speed for travel or lifting. As a variation, the crane can also be controlled using a radio remote control.
─ The trolley and the mobile control come as standard with an energy chain connected to the rest of the crane’s electrics. As a variation, the trolley and the mobile control can be connected to the rest of the crane’s electrics with a festoon cable system.
─ The crane is supplied with power via a conductor system. This is mounted parallel to the crane track. The conductor system is designed according to the conditions (thermal stress, length, voltage drop,…).
─ The semi-goliath crane is designed to withstand contact with another crane or the crane track end at low speeds without incurring any damage. The crane should not however be run against another crane or the crane track end at high speeds.
The end carriages:
─ The end carriages are fully-automatic, welded box girders.
─ The upper end carriages and the cross head beams are connected to the main girders using high-tensile bolts.
─ The wheels on the lower end carriage are not guided. Wheels that run directly on the building floor are provided with a plastic coating. If the crane runs on a floor rail, spherical wheels are used.
─ The upper end carriage has safety buffers to prevent damage if the crane runs at low speeds into the end of the crane track or into another crane.
─ The upper end carriage has guide rollers and guides the entire crane. It also features a lift-off prevention device for safety. This will prevent the crane from falling if the guide rollers become damaged. The wheels on the upper end carriage have flanges. The wheel flanges are not subject to load under normal crane operation.
─ The wheels on the upper end carriage have a diameter of 160 mm,200 mm, 280 mm or 350 mm.
─ Only for end carriages with the size 280 mm and 350 mm: The end carriage has a special rigidity aid on the inside, called a clamp brace, which transfers the stress from the main girder to the end carriages.
The crane travel drives:
─ The semi-goliath crane travels with two crane travel drives, which are installed on the upper end carriage. Since the crane travel drives are installed on the upper end carriage, the danger zone on the lower end carriage is not enlarged by the protruding crane travel drives.
─ The AZP drive is used for sizes 160 mm to 280 mm. However, for the 350 mm size, the AZF drive is used.
─ The drives are designed as pole-variable rotary current motors with electromagnetic brakes and gear units.
─ The drives have a low and a high speed. The ratio of the two speeds is 1:4.
─ The drives have a modular construction of motor and gear unit to enable easy replacement.
─ The drives can be continuously adjusted in speed by the ABULiner frequency converter (optional).
─ The drives are connected to the motor protection switch in the crane panel.
─ The acceleration of the drives to high speed is switched on after a brief time delay. The drive is thereby prevented from running in a starting current for a longer period in inching mode (rapid switching back and forth). This would eventually damage the motor.
─ When braking from high to low speed, only two of the three phases of the drive are briefly switched to low speed. In doing so, the drive does not jerk to a halt but brakes softly. As a result, the load does not swing as greatly. This function controls the standard SU1 device.
─ When braking from high speed to a complete stop, for a short period prior to stopping the drive is switched to low speed. In doing so, the drive initially brakes dynamically. There is thus less wear on the brake lining and the lining does not need to be replaced so frequently. (Optional, control by the SU2 device)
─ The crane electrical system is stored in the crane panel on the end carriage.
─ The crane electrical system has the protection rating IP 55.
─ The crane electrical system is protected by regular fuse links in its main fuse.
─ The crane electrical system has mechanically interlocked directional contactors. This ensures that the drives cannot be connected to both directions of travel at the same time. This would cause a short circuit.
─ The crane electrical system is particularly service-friendly due to screwless terminals and wiring in cable ducts.
─ The crane electrical system is switched centrally through the main contactor. It is located in the crane panel. If the emergency stop button is pressed or if an emergency stop is triggered for other reasons, the main contactor switches off the power for all drives.
─ As a result of plug-in connections between all crane components, the crane electrical system is particularly maintenance-friendly.
The crane travel limit switches:
─ The crane travel limit switches are redundantly installed with two cross-type limit switches per travel direction. The two cross-type limit switches monitor each other in that they must always switch simultaneously and must always have the same switching status.
─ If the switching status of the cross-type limit switches does not match, a signal lamp lights up and a horn sounds. This can indicate a fault on one of the cross-type switches.
The anti-collision device:
─ With more than a single semi-goliath crane on a crane track, the semi-goliath crane is equipped with an anti-collision device with braking function. This prevents the crane from running into another crane on the same run at high speed.
─ The anti-collision device consists of a light barrier on the crane and a reflector on the opposite crane. The light barrier is inclined at a defined angle. If one crane and another crane travel toward each other, eventually the reflector of the opposite crane appears within the area of the light barrier of the first crane. The light is reflected and the crane switches to slow speed (braking function).
─ The anti-collision device is redundantly installed with two light barriers per travel direction. The two light barriers monitor each other in that they must always switch simultaneously and must always have the same switching status.
─ If the switching status of the light barriers does not match, a signal lamp lights up and a horn sounds. This can indicate a fault on one of the light barriers.