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The container crane is a heavy gantry crane used for container loading and unloading operations, through the boom and the winch mechanism of the large truck traveling system and other core components work together to achieve the container lifting, panning and positioning. Understanding the container crane parts composition and working principle, can help operators familiar with the equipment structure and optimize the operation process.
Container crane mainly comprises main girder structure, support system, operating mechanism, hoisting system and control system, etc., and all components work together to realize efficient and accurate container handling operations. The following are the main functional characteristics of each component:
The main girder adopts box girder or truss girder design, which has high-strength torsion-resistant characteristics, and the span can be up to 40-60 meters.
The single/double cantilever structure is configured, and the cantilever length is designed to be 10-20 meters according to the operational requirements.
Rigid door leg ensures the stability of the whole machine, and the flexible door leg is equipped with hydraulic equalization device to adapt to the unevenness of the track.
The distance between the legs can be customized to meet the needs of different yard access widths.
The trolley running mechanism adopts multi-motor independent drive and is equipped with windproof braking device.
The trolley running mechanism realizes bi-directional precise positioning, and the running speed is up to 120m/min.
The closed-loop transmission system is composed of motor, reducer, reel set and steel wire rope.
Equipped with load monitoring device, the lifting speed is adjustable from 0-30m/min.
PLC distributed control architecture, integrating automatic positioning, anti-shaking control and remote monitoring functions.
Container gantry crane working principle is mainly through the hoisting mechanism, trolley running system, the precise coordination of the large traveling mechanism, to achieve efficient container loading and unloading operations, the specific working principle is as follows:
Hoisting mechanism through the inverter motor drive drum - wire rope system to achieve vertical lifting and lowering, and with the load monitoring to carry out safe operations; trolley running system usually adopts the four corners of the drive and the encoder positioning, along the main beam track to complete the The trolley running system usually adopts four-corner drive and encoder positioning to complete horizontal movement along the main girder track; the travelling mechanism of the trolley realizes longitudinal travelling of the whole machine through synchronous control of multiple driving units. Each system is coordinated by PLC main controller, combined with intelligent functions such as anti-shaking algorithm, automatic positioning and wind speed monitoring to form a complete closed-loop operation.
Container spreader system realizes automatic grabbing and releasing of containers through hydraulic rotary locking mechanism and guide plate device, with human-computer interaction interface, it can complete the whole process of automated operation from positioning, grabbing, moving to releasing containers, and the single-cycle operation time can be controlled within 2 minutes, which can satisfy the demand of modern ports for high-intensity and high-precision loading and unloading.
1) The big vehicle travels to the target box area → 2) The trolley runs to the top of the container yard → 3) The spreader descends and locks the box automatically → 4) The lifting mechanism lifts the container → 5) The big vehicle/trolley jointly runs to the target position → 6) Precisely drops the box and releases it → 7) Returns to the standby position. The whole process realizes semi-automatic/full-automatic operation through program control, and the average cycle time of single container operation is about 90-120 seconds.
During the whole operation process, container gantry cranes ensure the safety of operation through a variety of safety protection systems. When the rated lifting capacity is exceeded, an alarm will be issued or the operation will be stopped automatically to prevent the equipment from being overloaded. In addition, container cranes are equipped with limit switches to limit the lifting height and horizontal travel range to prevent accidents caused by excessive equipment movement.
The efficient operation of container cranes is derived from the coordinated operation of various core components. The main beam structure and the door leg support system form a stable load-bearing frame to support the lifting mechanism, trolley and large vehicle operation system; the lifting mechanism achieves precise lifting and lowering through variable frequency drive, and the automatic lock function of the intelligent spreader realizes the lifting and translation of the container; the trolley and large vehicle operation mechanisms move in coordination under PLC control to achieve precise positioning of the container. If you need to know more about the technical details or selection solutions of container cranes, please consult our professional team for customized services!
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