Simple Safety Measure for Movable Robots | Canada
Prevent accidents around movable robots in various situations
Safety measures for mobile robots can be complicated
Manufacturers leading the way in automated guided vehicles (AGVs) have focused on developing multifunctional products that can enable and enhance automation of tasks such as freight loading and unloading. These tasks were previously performed by human workers - by equipping AGVs with robot arms, this work can be automated to meet growing customer needs.
AGV designers considering how and where to fit robot arms face the challenge of achieving this new build and incorporating safety measures. The safety standards for AGVs are different to those for robots - researching both and deciding what to prioritize in the design takes time and effort.
In many industries, safety requirements for AGVs quickly become outdated with the evolution of new designs and functionality, and new guidance is often needed. As a result, manufacturers who want to propose robot-AGV builds may struggle to determine the appropriate level of safety measures for end users who demand thorough risk assessments before implementation.
Appropriate safety measures for when robots are travelling or in operation
In these cases, manufacturers must consider the risks associated with various conditions and implement the appropriate measures.
To start with, when the AGV is stopped and the robot is operating, the danger zone around the robot extends in every direction. This means that 360-degree detection is necessary to detect approaching human presences. The IDEC SE2L Advanced safety laser scanner can meet this requirement if 2 units are installed on diagonal points of the AGV: for example, one on the front right corner and the other on the rear left corner.
(A single SE2L Advanced unit has a maximum 270-degree detection radius. The master/slave unit functionality integrated multiple sensing inputs and outputs automatically, preventing signal interference and reducing wiring.)
Next, when the AGV is in motion the scanner's detection range should be limited to the appropriate danger zone. This is the area directly in front of or behind the AGV, depending on the direction of travel. It is only necessary for the safety laser scanner to detect humans, objects and other interference in this direction during movement. It is possible to set multiple detection and protection zones with the SE2L Advanced, and to switch the detection area based on the movement direction.
The detection area can be further divided into 'warning' and 'protection' zones. If a presence is detected in the warning zone, the robot-equipped AGV slows down and issues an audible warning. If the presence is detected any closer - in the protection zone - the AGV comes to a stop. These settings keep the AGV running efficiently and safely, allowing for more collaborative work between humans and robots.
Fitting an AGV with a safety laser scanner is a simple way to augment mobile robots with added safety measures - easier to achieve than some manufacturers and end users may think. As the SE2L Advanced scanner has a compact design, it gives AGV designers more options for installation and helps to keep the overall design streamlined.
IDEC's comprehensive product lineup supports various approaches to AGV design
Alongside our safety laser scanner lineup, numerous IDEC products can add value when designing and building AGVs. As an example, the HG1G operator interface has a slimline 4.3-inch display for easy mounting and offers FTP server functionality for wireless file transfers.
We also offer a wide range of switches, including pushbutton (on/off) switches, emergency stop switches, and illuminated buzzers in various designs and sizes to suit multiple applications.
Contact IDEC for more advice on safe equipment design and safety measures for AGVs and industrial robots. We can provide solutions that meet your needs and support your risk management activities.
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