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Motor rotating bottom blocks

They are special bottom blocks enabling the rotation of suspended load around vertical axis by means of motor drive, controlled usually from crane operator cabin or by means of remote control without intervention of service on the ground.

The drive can be solved as electromechanical, hydraulic or pneumatic and enables unlimited rotation of hook in both directions. Starting and stopping is controlled so, in order there should not occur the overrun of suspended load, thereby the consequent vibrations. Bottom block can be equipped also with system for load positioning, which will assure that after issue of command to rotating the bottom block hook will automatically stop in determined position.

In case if hydromotor is used for drive of hook rotation and hydraulic aggregate is mounted directly on the bottom block, here is always located signalling of important state values, which are decisive for correct and safe run of bottom block, e.g. liquid level in aggregate tank, liquid temperature, etc.
The drive of hook rotation can be according to customer's requirement equipped with system for hook disconnection from drive. In such case it is possible to rotate with hook manually as in case of standard bottom block.

Rotating bottom block
Rotating bottom block

In case if bottom block with motor hook rotating is to be installed instead of the existing bottom block on already operated crane, then this bottom block is structurally designed so, in order the existing bottom block could be directly replaced without requirement of any mechanical modifications of the existing trolley structure. It is only necessary to provide cable lead of power supply and control signals to the bottom block.

The bottom blocks can be also fitted with weighing system of various design and weighing accuracy. The detected load mass can be shown on display directly on bottom block, transferred on crane eventually even out of it, or there can be used combination of these methods.

In case if electromagnet or hydraulic grab are suspended on bottom block, then this block is fitted with socket for power supply and control of these devices. The supply voltage and control signals are lead to the bottom block from trolley by cable.

Bottom block 70t with motor hook rotating

Bottom block with motor hook rotating is a special suspension means of crane, designed for rotating of load, suspended on its hook. Because diameter of pulleys and their pitches are fully identical with the standard bottom block of the same capacity, it is possible to install this bottom block also on the existing crane, without requirement for crane mechanical modifications.

Hydraulic aggregate of rotation drive is installed on bottom block and electric motor of hydraulic aggregate is controlled by frequency converter, in order it should be possible to set up the smooth start and stop of load motion. Rotation is controlled from crane cabin by means of rotating lever controller.

Rotating bottom block 70t in operation
Rotating bottom block 70t in operation

In case of need it is possible to disconnect the drive and to rotate with hook manually as in case of standard bottom block. Drive system is also equipped with overload protection and it can be according to customer's requirement fitted with the light signalling of liquid level in the tank of hydraulic aggregate.

TECHNICAL SPECIFICATION
Lifting capacity 70000 kg
Number of falls 8
Speed of hook rotating 1 rpm
Range of rotating unlimited in both directions
Drive of hook rotating electrohydraulic
Hook single forged hook
Mains voltage 3 x 400 V, 50 Hz
Ambient temperature -15° až +45°C
Documents for downloading KPC_Ico_Pdf
Dimensions and properties of products can be fully adapted to the customer's needs. Please do not hesitate to contact us.

KRALOVO POLE CRANES, a.s.
Brigadnicka 69, Brno, 621 00
Czech Republic
Reg. No.
:
46357408
Tax No.
:
CZ46357408
Phone
:
+420 - 602 757 422
Fax
:
-
Email
:
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