Shanghai ENJUE Machinery Equipment Co., Ltd is one of the most experienced manufacturers and suppliers of electric telescopic container spreader in China. If you're going to buy custom electric telescopic container spreader made in China, welcome to get more information from our factory. For price consultation, contact us.
In modern container terminals, railway transfer centers, and multimodal transport hubs, lifting gear serves as a key connecting device between cranes and cargo, and its performance directly affects operational efficiency and safety. The Enjue fully electric telescopic container spreader is specifically designed to handle operations that frequently switch between 20-foot and 40-foot ISO standard containers. With a maximum safe working load of 41 tons, it meets the high-intensity loading and unloading requirements of mainstream ports and yards.
Driving Concept: Fully Electric Replaces Hydraulic, Achieving Precision and Cleanliness
Traditional container readers often rely on hydraulic systems to complete telescoping and locking actions, but hydraulic components have inherent shortcomings such as leakage risks, complex maintenance, and delayed response. The Enjue 20&40' electric telescope container spreaders abandons hydraulic circuits, and all motion mechanisms-including telescopic drive, lock opening and closing, and positioning assistance-are driven entirely by independent servo motors combined with gear reducers. This design brings three core advantages:
Improved Motion Controllability: The motor's rotation angle and torque can be adjusted in real time through the PLC, achieving millimeter-level telescopic positioning and flexible engagement of locks, avoiding mechanical impact.
Low Maintenance Throughout Life Cycle: No need to replace hydraulic oil, filters, or seals, eliminating oil contamination, suitable for a wide temperature range from -20°C to 50°C.
Quiet Operation: The electric drive system operates at less than 72dB, significantly improving the acoustic environment for drivers and surrounding operators.
Mechanical and Sensing Systems: Evolution from 'Adaptation' to 'Adjustment'
The main beam of the electric telescopic container spreader is welded from high-strength structural steel, with overall stiffness optimized via finite element analysis. Under a full load of 41 tons, the deflection of the telescopic section is controlled within 1/800 of the ISO standard requirement. The end beams are equipped with fixed flippers to help guide containers into the twist lock range, reducing container handling time.
To achieve reliable safety interlocking, the spreader integrates a multimodal sensor array:
Position Verification Sensors: Non-contact magnetic encoders are installed at both ends of the telescopic travel (20-foot and 40-foot positions) and at key intermediate points, providing real-time feedback of the actual length to prevent overextension or incomplete retraction.
Twist Lock Status Monitoring: Each twist lock is independently equipped with open/closed limit switches and hardwired to the lifting mechanism's electrical circuit for interlocking. If any twist lock does not reach the fully closed position, lifting operations are prohibited by the system.
Anti-Offset Load Detection: Strain-based load sensors are embedded on both sides of the main beam to detect shifts in the container's center of gravity. If the deviation exceeds the set threshold, an alarm is automatically triggered, and telescopic movement is stopped.
Tech Specs for Reference
| Item | Parameters |
|---|---|
| Model | EJ20&40FT |
| Rated lifting capacity | 41 tons (including the weight of the lifting gear) |
| Applicable container | 20' &40'ISO standard |
| Telescopic drive method | Electric gear rack/screw (optional) |
| Rotary lock drive mode | Electric rotary actuator (independent for each lock) |
| Telescopic time | ≤45 s(Full travelling) |
| Rotary lock operation time | ≤1.5 s / unit |
| Protection rating | Whole machine IP54, motor and sensors IP65 |
| Power requirements | AC 380V/50Hz or AC 440V/60Hz (customized) |
Control Architecture: PLC-Based Multi-Mode Intelligent Scheduling
The control system of theEJ20&40'electric telescopic container spreader is built on a Programmable Logic Controller (PLC). It adopts a modular program architecture, encapsulating functions such as telescoping, twistlock, flipper, and safety protection into independent subroutines, with status sharing achieved through a central data bus.
The control logic includes the following key features:
Interlock Matrix: Telescoping actions are only allowed when the electric telescopic container spreader is unloaded, and all twistlocks are fully open; twistlock locking operations can only be triggered when the spreader is accurately positioned above the container corner castings and the telescoping length matches the current container length.
Fault Diagnosis and Degraded Operation: The PLC continuously monitors motor current, temperature, and sensor signals. When a motor experiences a minor overload, the system automatically reduces the power of that axis and attempts a reverse action to clear the jam; if a sensor fails, it automatically switches to the backup signal mode provided by redundant limit switches to ensure uninterrupted operation.
Multi-Control Terminal Compatibility: Supports a cabin control console (wired), a wireless remote controller (2.4GHz frequency-hopping, effective range ≥150 meters), and a semi-automatic mode. In the semi-automatic mode of our container spreaders, the operator only needs to issue a "pick container" or "place container" command, and the PLC will automatically complete telescoping positioning, twistlock action sequences, and status confirmation, significantly reducing operator fatigue.
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