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Combining Robotics with Integrated Vision
Time: 2015-01-30
The robot has its place in a 'heavy lifting' role such as palletizing. Robotic systems are being integrated into other operations and processes, sitting among multiple functions on a single operating platform. So, while the popular image of a robot may be a six-axis giant working in the automotive industry, there are many opportunities for them to play a role dovetailed into complex lines helping to automate food, pharmaceuticals, electronics and packaging lines.
 
This is especially true of the Delta-style robot which is now an established part of the Omron range, and which offers pick-and-place speeds of up to 150 cycles per minute. These robots have been developed to fit seamlessly into Omron's Sysmac control platform, alongside servo drives and motion control, PLCs, safety, vision, temperature control - and more - all linked by the same software. Despite their lean looks and compact shape, these Delta robots can handle the vast majority of products within the aforementioned industry sectors, and are able to handle payloads of up to 3kgs.
 
The flexibility of robotic systems can be a huge benefit for end users and machine builders who embrace robots as an integral part of their automation platform, especially when they are used to replace less flexible - or perhaps more complex - electromechanical systems. In many cases, they can form a vital part of the link between two processes or machines.
 
 
Robotic systems can have other benefits. For instance, a few in the food industry have seen this sort of investment as being difficult to justify on the basis of returns, given the unpredictability of many retailer relationships. The other side of this story is that, for those able to invest, robotic components allow manufacturers not only to respond flexibly to changing retailer demands, but to be proactive about plugging a gap in the market. They are likely to permit a far wider range of options for new product, pack formats or size options.
 
There are precedents for this sort of shift in thinking. Only a few years ago, the use of servo drives in food, pharma and packaging equipment was thought of - in some quarters - as an over-specified and indulgent luxury. Today, they are an essential component in any high-speed line aiming to combine compact design with precision and repeatability. Within the Omron automation platform, robots share the same communications system as other servo drives and connect to the same controller. Line managers and operators who are comfortable with servos are likely to feel the same way about integrated Delta robots. Set-up and operation are straightforward.
 
Omron's Sysmac NJ Delta controller will run up to eight robots, synchronising up to 64 axes of motion. A single controller makes for simpler operation, coordinating motion for the entire machine and reducing space requirements. The synchronisation of multiple machines or lines can be fully programmed thanks to a powerful command set developed especially for pick and place applications that use delta robots. With Omron's product range, programming is to IEC 61131-3 standards, and is carried out within the Sysmac Studio software package - the same package used to program all other Sysmac components. The software includes a comprehensive robotics library to make it simple to set up sophisticated robot motion profiles. Integration with other Sysmac components is via on-board EtherCAT, with an EtherNet/IP port also included for communications with higher level systems.
 
Omron offers a range of over 70 models of SCARA robot, capable of lifting up to 50kg. Meanwhile, it is not only end users - and potential users - who are rethinking the contribution made by robotics. In the past, parts of the food industry have at times felt there was a poor fit between robots (often automation in general) and its own requirements, particularly before the packaging stage. A huge amount of work is currently going into both washdown versions of pick-and-place systems and end actuators - grippers and other tooling - which take account of the variable size and shape of food components.
 
The ability to combine robotics with integrated vision is already proving invaluable in high-accuracy pick-and-place, for instance, where randomly-spaced product presents itself on an infeed conveyor. Gripper technologies mean that even potentially fragile products can be safely manipulated this way. Robot technology is as varied and fast-developing as the other elements contributing to improved, more streamlined automation: a multi-bit tool in a wider, ever-growing toolbox. But if there remains a stubborn feeling that robots are in fact qualitatively different from all the other automation options on offer, there might be a reason for this. Just as the programmability of robots offers more options, it also offers more benefits.
 
There can be few other single components which offer reliability, consistent product quality, greater flexibility, reduced wastage, improved efficiency and safety - as well as the potential cost benefits of a redeployed workforce.
 
 
 
Source: www.packagingeurope.com