Liebherr’s driverless transport systems help connect diverse processes

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Automated guided vehicles open up new possibilities for connecting machines and systems. (Courtesy: Liebherr)

While there’s still a way to go to achieve autonomous driving on the road, factories are miles ahead. AGVs are already being used in the area of production.

AVGs (automatic guided vehicles) are responsible for intralogistical tasks in production transporting workpieces from unfinished parts to finished parts between the respective stages of production.

Here’s how raw material makes it into a fully automated production system; finished parts exit the system with Liebherr solutions.

Reliable 3D vision systems optically scan the workpiece environment and evaluate it. A robot with patented auxiliary axes can use this information to reliably unload randomly stored parts from a container with a depth of up to 1m and position them on an AGV. Picking from the box is more complicated the less order there is when the workpieces are delivered, which means that more precision is needed to place them.

Similar rules apply for the production outlet: The robot arm of a pallet cell picks the machined workpieces from the AGV and then palletizes them in workpiece carriers such as wire crates or blisters.

“Multi-layered storage in crates or blisters during which the robot restacks the crates and blisters in addition to workpiece handling as an intermediate step is also not a problem,” said Thomas Mattern, head of automation system development. “Since the grippers can be changed flexibly, many options are available to us. This is the step that has been missing in automation technology: individual production processes are already heavily automated, and now they are connected flexibly to each other,” Mattern said.

At EMO 2019, Liebherr-Verzahntechnik GmbH demonstrated a possible automation solution for production inlet and outlet coupled with an autonomous AGV. A system such as this can be of great interest for standalone production as well. Mattern sees a clear necessity for systems such as these. “The more flexible production becomes, the more important intralogistics is. More diverse parts also mean more movement in production. Smaller batch sizes have to take different paths in the factory. With our combination of AGVs and bin picking, we are addressing a very important topical subject here.’’

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