Overhead Crane Safety Protection Devices of DQCRANES

Overhead crane safety is a key point that customers care about, because it is related to the lift-time of crane itself and safety of operator. Dongqi Group, as top crane manufacture in China, provides types of overhead cranes with complete safety protection devices.

overhead crane protection devices

First, overload limiter

Its safety function is that when the lifting weight is over the rated value, the crane stops lifting to avoid overload accident.

Second, buffer

It is kind of safety device that is installed at the end of the metal structure of track-travelling cranes. It has secure functions of absorbing collision energy of travelling mechanism, reducing the impulsion.

Third, anti-wind and anti-slip devices

Rail cranes working outdoor should be equipped with anti-wind and anti-slip devices, because these safety devices can avoid outdoor cranes slide along the rail in windy day. Its safety function is that when the crane encounters the strongest wind not in the working state, the crane can’t be blown away and will not overturn at the end of the rail. Common anti-wind devices have clip-rail, rail anchor device, iron wedge stopper.

Fourth, limit-position limiter

It is also called travelling limiter. When the crane mechanism is working and travelling near the limit-position, the limit-position limiter can automatically cut off the power and stop the mechanism moving. Limit-position limiter has three types: lifting type, dropping type and travelling type.

Fifth, interlocking protection

It can connect the state of interlocking with the movement of working mechanism. When the switch is on, the corresponding restricted mechanism can’t start, only when the switch is off, the interlocking mechanism can work. Interlocking protection can avoid the crane mechanism working in certain conditions and hurting people.

Sixth, zero position protection

It is necessary to set up zero position device, because lifting mechanism, crane travelling mechanism and trolley travelling mechanism are controlled respectively by three operation devices. Its protection function is that if only one mechanism’ controller is not on the zero position, all mechanisms can’t start. Only set all mechanisms’ controllers on zero position, the working mechanism can start.

Seventh, emergency switch

All cranes must be installed with emergency switch to cut off the power quickly in emergency. And it should be set on the place that makes the operator convenient.