Sucking robot arm wins Amazon Picking Challenge By Leo Kelion

Technology desk editor Published duration 4 July 2016

media caption Watch: Team Delft's robot arm outscored its rivals

A robotic arm that combines a suction cup, a "two-fingered" gripper and a 3D depth-sensing camera has won Amazon's latest warehouse bot competition.

Team Delft's machine triumphed over its rivals at both of the two tasks.

One involved selecting products from a container, picking them up and putting them on a shelf. The other was doing the actions in reverse.

Amazon already uses robots to move goods about its buildings but relies on humans to stock its shelves.

"Our vision is humans and robots working shoulder to shoulder," said Tye Brady, chief technologist at Amazon Robotics.

image copyright RoboValley image caption The robots had to carry out each task without intervention from their owners

"It was inspiring to see 16 top teams with so many different approaches to the same problem, and we also saw the advancements robotic technology has made since last year."

The Dutch winners were awarded $50,000 (£37,695).

They beat two teams from Japan and five from the US - countries better known for their robotics research - at the contest in Leipzig, Germany.

Pick and stow

Forty different items, representing some of the retailer's bestselling products, were used in the Amazon Picking Challenge.

They represented a mix of different shapes, including soft clothing, a boxed DVD, a bottle of water and a toothbrush.

image copyright Team Nimbro image caption The robots had to identify and lift objects out of a box

In the "stow" task, 12 different items were put in a red plastic box. The robots had to pick them out - in any order - and put each one at a predetermined place on a shelf.

In the "pick" task, a dozen specific items had to be lifted off shelves containing a mix of goods and packed in the boxes. In some cases, other products had been deliberately placed in the way of the targets. This proved the tougher of the two jobs.

In both cases, the teams were only given a computer file describing the range of objects involved and instructions for which should be moved, five minutes before they had to start. Once the task began, the robots had to act autonomously.

Points were deducted for:

damaging any item

dropping the products from a height of more than 30cm (11.8in)

leaving an object protruding more than 0.5cm outside where it belonged on a shelf

"Because of the variation in items, you couldn't have a single picking strategy," Team Delft's Kanter van Deurzen explained to the BBC.

"Usually in industry, you would have a suction cup or a mechanical gripper designed for one type of item or part.

"Here, we had to handle dozens varying from simple boxes to a T-shirt and a dumbbell - each required a different approach.

image copyright Team Delft image caption Team Delft's arm was able to lift objects up over other items in their way

"To do all of this with a single arm, to have to recognise how the objects were oriented and to avoid collisions with other objects on the shelves was a really big challenge."

High marks

In the stow task, the Dutch team came close to a perfect score.

Its only mistake was that when its arm's suction cup lifted a small pack of glue, it also picked up a bottle-cleaning brush, which then dropped to the ground.

It made more errors in the pick task, and initially tied on points with Japan's Team PFN.

But Delft was given the advantage because it took 30 seconds less time to make its first pick.

image copyright RoboValley image caption Team Delft's arm can lift objects via both a suction cup and a gripper

Robots v workers

The rapid development of robots and the artificial intelligence software that powers them has raised concerns.

Amazon's $775m (£584m) acquisition of Kiva Robotics in 2012 already means the US company has been able to limit the number of employees it needs to move its portable shelves about.

Elsewhere, Germany's Magazino has developed bots that can pick standard rectangular objects off warehouse shelves.

And Google owns a start-up whose automated arms can unload boxes off lorries and sort them on to conveyor belts.

image copyright Getty Images image caption Amazon already uses robots to move goods around its warehouses

Despite such progress, Mr Van Deurzen said warehouse operators would still need to employ at least some humans for the foreseeable future.

"It's really difficult to design a system that can create any type of object in any type of situation," he said.

"But a lot more is already possible than most warehouse owners are aware of.