A German manufacturer of cranes and lifting platforms claims to have “solved the problem” of weather damage to electric thrust cylinders by replacing them with hydraulic rotary actuators.
Albert Bocker GmbH was using electrical controls to ensure lifting platforms stayed within 5o of horizontal. But it found that the thrust cylinders could not cope with the freezing weather conditions in which the platforms were working, and water ingress frequently led to frost damage.
The solution was hydraulic rotary actuators, according to the company that supplied them, Parker Hannifin.
The chosen Parker HTR10 rotary actuators are impervious to water, it is claimed, and have a continuous torque output of 700Nm at 130 bar.
Parker says that its rotary actuators are now fitted to all new lifting platforms produced by Brocker and they are also being retro-fitted to many older ones.
