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World’s first non-chemical weed-killing robot unveiled

Posted on 17 May 2021 and read 778 times
World’s first non-chemical weed-killing robot unveiledThe world’s first non-chemical robotic weeding for cereal crops, made by agri-tech start up the Small Robot Company
(SRC), has successfully identified and killed weeds at a field trial in Hampshire. The wheeled robot uses Igus delta robot arms to position a ‘zapper’ and deploy ‘lightning strikes’ to kill weeds, supplied by Northampton-based Igus, selected for their precision, low-cost and lubrication-free engineering.

The weed-killing robot, called ‘Dick’, works in tandem with a monitoring robot, ‘Tom’, to identify weed patches then kill individual plants with a zapper device. Other novel farming and industrial applications of the robot using the Delta arms are also being explored.

The device is a non-chemical weed-killing robot that can destroy weeds at an individual plant level, making it a low-impact technology for farming where the currently necessary blanket spraying of herbicides involves costly wastage, with detrimental impact on the environment. In addition, soil degradation from herbicides and soil compaction reduces crop yields.

Dick successfully identified individual weeds using artificial intelligence (AI) and vision technology, and zapped them at a media event in East Tytherley at the end of last month. The Small Robot Company (SRC) has so far developed three robot variants for farming applications – Tom, Dick and Harry.

Igus’s Delta robot, used commonly in industry for pick-and-place operations, manoeuvres the zapper into place using an integrated motor and encoder, linked to the Dick robot’s master controller. The three Igus delta arms fitted to each Dick can then destroy weeds simultaneously.

Igus was selected as the preferred delta robot manufacturer due to the lightweight, precision and low cost. Many competing delta robots cost up to £20,000 while the Igus delta is about £5,000, developed at this price as part of Igus’ low-cost automation division for R&D applications, but possessing robust engineering suitable for commercial scale-up.

Also at the event, the ‘Tom’ monitoring robot uses proprietary Wilma artificial intelligence (AI) to scan the field for weed patches which it uses to define a path for “Dick” to follow. Dick is then dispatched to “seek and destroy”, and the Dick robot can now both identity specific weeds in a patch and kill them.

This two-robot approach demonstrates SRC’s ‘end-to-end service‘ model, using multiple robots with AI working together to scan the field on a plant level then take action. Furthermore, SRC and Igus are looking to work on different actions, where Tom and Dick could combine again for spot spraying, spot fertilising or slug killing, for example.

The Igus delta robot’s components and control system is key to the weed killing operation, where ease of use and cost are paramount. The delta units are made from standard drylin parts, making assembly easy and they have been thoroughly field tested to ensure they cope with wet mud and water splash.

Stepper motors are linked to controllers that help position the delta robot directly over the weeds. The motors have encoders, which help the delta know what position it is in, with good industrial protocols so they are easy to programme. Dick’s master controller and AI “speak” to the Igus motor controller to synchronise the robot’s position with the delta arm, forming a closed loop monitoring system.

Igus automation engineer Angelos Bitivelias has worked with universities and industrial companies on delta robots for applications like fruit picking, so he brings the knowledge of how the Igus delta can be best modified for the weed killing application.

He explained: “Dick moves to one side, a camera takes a photo of the weed, the AI identifies it as a weed, and then AI decides where to zap it,” says Angelos. “The kinematics of the Delta makes it well suited to the end effector and the belt drive means the zapper is always parallel to the ground below.”

An essential feature of the Delta and Igus components is they are lubrication-free. Lubricated moving parts like the belt drive and bearings would potentially clog up with soil and water in a muddy field, but igus polymers and parts are designed to be dry running.



Andy Hall, head of prototyping at the Small Robot Company, said: Precision is also a strong feature. The milestone we have hit is that we can now take action at the plant level.”

“Using artificial intelligence, the robots can recognise the weeds in the camera shot and target the robotic arm onto those weeds. At that point we can do anything we want. Our robotic platform incorporating the Igus arm could have many different technologies bolted on – and the world’s our oyster on that.”

Matthew Aldridge, managing director of Igus UK, said: “Because the delta is lightweight and low cost it has opened up new opportunities for these robots to be used in mobile applications, proving a new technology in a harsh outdoor environment.

“Igus is now planning to work with SRC on new industrial applications where precise and low-impact actions are needed on farms and potentially in other scenarios.”

Ben Scott-Robinson, SRC co-founder and CEO, concluded: “We have now proved we can deliver per plant weeding: a world first. The focus for us now is being able to move forward to deliver this repeatedly, and at scale — this will be game changing.”

The next stage for Tom and Dick are efficacy trials, measuring the force required to destroy the weeds, including the comparison of different varieties, to ensure that they are destroyed and not partially killed.