The overload limiters for single girder cranes mainly include the following types:
- Mechanical Overload Limiters:
- Lever-type Overload Limiter: Uses a lever mechanism to sense the load weight. When overloaded, it triggers an alarm or cuts off the power.
- Spring-type Overload Limiter: Senses load changes through spring deformation. When the preset overload value is reached, it triggers an alarm or protective device.
- Electronic Overload Limiters:
- Strain Gauge Overload Limiter: Measures load weight using strain gauge sensors. When the load weight exceeds the set value, the system issues an alarm or stops the crane's operation.
- Pressure Sensor Overload Limiter: Detects changes in hydraulic system pressure to determine load weight. When the pressure exceeds the preset value, it triggers overload protection.
- Intelligent Overload Limiters:
- Digital Overload Limiter: Utilizes digital sensors and microprocessor technology to accurately measure and display the load weight. When overloaded, it issues an alarm or automatically stops the crane's operation.
- Wireless Overload Limiter: Uses wireless transmission technology to send load data to the control system, enabling remote monitoring and management. It automatically triggers protection measures when overloaded.