Introduction
The double-girder dedicated load limiter is optimized for the large-capacity and long-span characteristics of double-girder cranes. Sensors adopt pin-type replacing the fixed pulley shaft, plate-ring series-connected at the wire rope fixed end, or pressure-type installed below the pulley seat, with flexible installation without changing the original structure. The control instrument uses an industrial-grade microprocessor, supporting multi-channel sensor signal acquisition and redundant comparison; overload detected by any channel triggers protection. Featuring real-time load display, peak hold, fault self-diagnosis and RS485 communication, it can be connected to the crane safety monitoring system, complying with national crane safety regulations and double-girder crane special requirements, widely used in machinery manufacturing, metallurgy, shipbuilding and other large-capacity double-girder lifting applications.
Our Advantage
Using alloy steel high-precision sensors with overall accuracy ±2%, compatible with 5t~500t large-capacity double-girder electric hoists, maintaining stable and accurate measurement even under long-term full-load operation, eliminating false and missed alarms.
Three sensor types—pin-type, plate-ring and pressure-type—are available, flexibly selectable according to the fixed pulley block structure of double-girder cranes, without modifying original mechanical structure, facilitating renovation and upgrading.
Supports dual-channel sensor signal acquisition and cross-comparison; overload detected by either channel immediately triggers protection, ensuring safety even if one sensor fails, with safety margin far higher than single-channel products.
Sensor signals transmitted via shielded cables, control instrument built-in with optoelectronic isolation and digital filtering circuits, effectively resisting strong electromagnetic interference from inverters and electromagnetic chucks, adapting to complex electromagnetic environments in double-girder workshops.
Featuring load display, peak hold, fault self-diagnosis, RS485/4-20mA output, it can be connected to the crane safety monitoring system for remote load monitoring and data tracing, meeting intelligent management requirements.
Specification
| Parameter | 5~20t | 32~80t | 100~200t | 250~500t |
| Applicable Capacity | 5t / 10t / 16t / 20t | 32t / 50t / 80t | 100t / 160t / 200t | 250t / 320t / 400t / 500t |
| Sensor Type | pin-type | pin-type / plate-ring | plate-ring / pressure type | plate-ring / pressure type |
| Applicable Shaft Dia. | Φ30~Φ60mm | Φ60~Φ100mm | Φ100~Φ150mm | Φ150~Φ200mm |
| Number of Sensors | 1~2 | 2 | 2~4 | 4~8 |
| Overall Accuracy | ±2% | ±2% | ±2% | ±2% |
| Pre-alarm Point | 90% Rated Load | 90% Rated Load | 90% Rated Load | 90% Rated Load |
| Alarm & Cut-off Point | 105%~110% Rated Load | 105%~110% Rated Load | 105%~110% Rated Load | 105%~110% Rated Load |
| Response Time | ≤0.3s | ≤0.3s | ≤0.3s | ≤0.3s |
| Display | LED digital display | Same as left | Same as left | Same as left |
| Contact Capacity | 10A / 250VAC | 10A / 250VAC | 16A / 250VAC | 16A / 250VAC |
| Communication Interface | RS485 / 4-20mA (optional) | Same as left | Same as left | Same as left |
| Power Supply | AC 220V / 380V (optional) | Same as left | Same as left | Same as left |
| Protection Degree | IP65 (Sensor) / IP54 (Meter) | Same as left | Same as left | Same as left |
