COMANSA, global manufacturer of tower cranes for construction, has upgraded the models 21LC660 and 21LC750, mainly for large industrial projects, energy, mining and PPVC construction, with an aim to significantly improve performance
The versions of 24, 36 and 48 tonnes (52,910, 79,360 and 105,820 lb) of both models have increased their maximum load capacity to 25, 37.5 and 50 tonnes (55,120, 82,670 and 110,230 lb).
This improvement is achieved due to the use of a compacted wire rope, of smaller diameter, and an optimised design of a lighter trolley-hook set. This change aims to increase the maximum load capacity of the crane and improve the loads in radius.
The company has created a modular counterjib for these models, which allows up to six different configurations according to the jib length. The advantages of this new counterjib encouraged COMANSA to apply this design to cranes 21LC660 and 21LC750, which will improve the counterjib radius of both models when they are erected with reduced jib-lengths.
COMANSA provides an optional 90-metre radius for special applications. This option is available for the 21LC660 and 21LC750 models, as well as for the 21LC1050 crane.
Models 21LC660 and 21LC750 (except the 20t version of 21LC660) now feature a new optional hoist mechanism (132 kW - 177 hp), which allows speeds of up to 300 metres per minute. COMANSA also added the Effi-Plus system to the optional 110 kW hoist mechanisms (148 hp), available for all versions of such models.
“This system, which was already implemented in the other motors of both models, increases the hoist speed almost 15% with light loads. These two mechanisms greatly improve the productivity of the crane, especially when working at large heights. Both motors can have wire rope capacity of 720 or 1,570 metres, which allows these cranes to work with heights under hook of up to 785 metres,” the company noted.
The 21LC660 and the 21LC750 cranes are two of COMANSA’s models with wide acceptance globally, mainly due to their productivity and competitiveness. These cranes have worked in projects in different countries such as Germany, South Korea, Canada, Angola, Singapore, Sweden, Australia, Argentina, Hong Kong, Ivory Coast, etc.
In addition to the flat-top design, models 21LC660, 21LC750 and 21LC1050 offer the customer advantages such as the ease and safety of their erection and enormous versatility and modularity.
