Every year, tonnes of cargo arrive at seaports. Current technology and engineering guarantee efficient and effective logistics. Many functions used for unloading the container at the port have been automated. In the article below, we will try to explain exactly how the container unloading in port looks like.
Each port performs such basic functions as:
- receiving containers in terminals;
- registering the arrival of containers;
- obtaining relevant logistic data;
- adding containers to the current state of the port;
- storage of containers in an appropriate location system;
- stacking (preparing the container to leave the terminal);
In this article, we focus mainly on container unloading.
The definition of unloading is as follows:
Unloading is placing the appropriate container on a ship, chassis, wagon, or any other means of transport.
When the ship arrives at the port, the containers should be unloaded. This is usually done with the help of special container cranes. In the photo below, you can see how such a crane looks like.
These types of cranes pick up containers from the ship’s cargo hold and deck.
Then the containers are placed on the vehicles.
AGVs (automated guided vehicles) can also be used to transport containers. These types of vehicles move without the participation of drivers. They are run by PLC controllers (programmable logic controller) for mobile applications. After receiving the container, AGV moves the container to the previously selected stack. The stack consists of several lines between which containers can be stored for a limited time.
Setting up containers in such stacks is done using automatically controlled container stackers, the so-called ASC (Automated Stacking Cranes).
Further container unloading steps
When the AGV arrives near the sensor-rich line, the ASC pulls the container and places it on a certain stack. When necessary, after a certain time the containers are again picked up by ASC and transported by AGV for further means of transport (e.g., barges, trucks or trains).
A similar process, but in reverse order, also occurs when loading a container onto a ship.
The procedure of placing containers on appropriate stacks is to facilitate operations taking place in specific parts of the quay and the public area during unloading of ships and subsequent reloading.
The video attached below shows exactly how the container unloading looks like in the port on the example of the BCT terminal in Gdynia.
We also encourage you to read articles describing ports in the world: