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What Are The Protection Devices Of Fixed Cranes

The protector of stationary cranes in port machinery is a safety protector for stationary cranes to avoid overweight, also known as lifting weight limiter. Its safety function is to stop the lifting posture when the lifting load of the fixed crane exceeds the rated current, thereby preventing safety accidents caused by overweight. Overload limiters are commonly used on fixed cranes and lifting platforms for accumulating chain types. Some types of jib fixed cranes (such as vertical fixed cranes, portal fixed cranes) use overload limiters and torque limiters in conjunction with each other. There are various types of overload limiter, pedal type and electronic type.
Push the striker bar according to the functions of the lever, spring, camshaft, etc. When overweight, the striker bar works with the power switch that controls the lifting posture to cut off the energy source of the lifting organization, and manipulate the lifting organization to interrupt the operation. It is composed of a controller, an operational amplifier, a manipulation electric actuator and a load indicator, which unifies the safety functions such as display information, manipulation and alarms. When the fixed crane is hoisted, the controller on the load-bearing prefabricated component causes deformation, which converts the net load of the load into an electronic signal, which becomes larger after and calculations to indicate the nominal value of the load. When the load exceeds the rated load, the energy of the lifting organization is disconnected, so that the lifting posture of the lifting organization cannot be maintained.


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