SUPPLEMENT FEATURE MACHINE VISION SYSTEMS SENSORS FOR HIGH-BAY WAREHOUSES
Sensors by Leuze electronic are being used in a growing number of intralogistics applications
T
he Leuze LSIS 472i smart camera, a special device type within the LSIS
400i smart camera family, is intended for compartment fine positioning, mainly in double-deep shelves. LSIS 472i detects circular holes or reflectors and determines the position deviation in the X and Y direction relative to the target position.
REDUCED SENSOR SYSTEMS Until now, several photoelectric sensors were necessary for this application. Now, the user only requires one camera per
LSIS 472i for compartment fine positioning of a HBSD in double-deep warehouses
double-deep pallet compartment. It is not affected by ambient light – which is not uncommon in warehouses – due to the integrated illumination with powerful infrared light. This solution reduces the cost of wiring and mechanical mounting. The M12 connector makes installation with ready-made cables easier. Teaching-in a hole position using teach mode is quick and simple. The camera can be configured via the browser with webConfig – no separate configuration software is necessary. This makes start- up considerably easier, because costly alignment, configuration and testing of the sensor system are not required. Errors during start-up are significantly reduced. Image transfer and the associated
process monitoring during operation take place via FTP. The camera has integrated interfaces for field buses and industrial Ethernet, and also for RS232 and Ethernet TCP/IP. Eight configurable
digital IOs are available in total, e.g. for positioning the HBSD.
THE LSIS 400I SERIES LSIS 400i is characterised by its motor- driven focus adjustment and homogeneous illumination using free- form surface optics. In addition to type detection, position and orientation determination, and its presence, completeness and dimensional control, the LSIS 400i smart camera can also be used anywhere different labels have to be detect-ed and evaluated at high speed. The camera reads printed and directly marked 1D/2D codes with absolute reliability and, independently of the contrast, even in reflected or inverted form. It also has a measurement function.
Leuze electronic T: 01480 408500
www.leuze.co.uk
Pharmaceutical tablet packing and inspection
left undetected before it leaves the manufacturer, can cause the whole factory to be shut down for a period in addition to crippling fines. In general terms the bulk product (tablets or
P
harma Packaging Systems (PPS) based in Pershore specialises in packaging systems for
the pharmaceutical industry. Multipix Imaging, a distributor specialising in machine vision, has been working with MVT, Leamington Spa, since 2003. Multipix offers advice, supply and support of machine vision components which include assisting with application evaluation and loaning equipment to MVT when necessary. MVT is an independent vision systems integrator which means it is totally free to choose the right vision system for each application. MVT was approached by PPS after the
company identified an opportunity to offer its customers the benefits of machine vision by creating an inspection solution for its existing range of counting and packaging machines. The purpose of the inspection is to check for
broken, partially formed or cross contamination (rogue tablets from another batch). In the pharmaceutical industry, cross contamination, if
S8 OCTOBER 2015 | MACHINE VISION SYSTEMS
capsules) feed from a hopper onto vibrating trays that feed and separate the product and guide them along the stainless steel trays. As the tablets leave the end of the feed trays they pass through high speed infrared optical sensors that count the products in free fall. The products are counted with high accuracy, at high speed, into bottles that are indexed on a conveyor by a scroll drive system. The innovation has been to place cameras above the final feed tray to inspect the tablets just before they are counted and bottled. Another challenge to overcome was the bright
and reflective finish of the stainless steel tablet feed trays which cause the tablets to reflect in the channels of the tray. Therefore the challenge
for the vision system when measuring the tablet length, width, area and colour is to differentiate between actual product and its reflection. Each camera positioned above the tray images six lanes of tablets. Each tablet is typically inspected ten or more times as it passes from top to bottom through the camera’s field of view (FOV). The main problem to overcome was the product appearing to be either good or bad at any one instant in time depending on which face it was presenting to the camera as it feeds. MVT spent over one year developing some very sophisticated tablet tracking software. As the tablets leave the tray and get counted
into a bottle the vision system outputs the tablet inspection result. Once the inspection returns a ‘good’ result for a tablet it is ‘locked-in’ as good, even if it then bounces onto an edge and so appears to be ‘bad’ in subsequent inspections. The tablet must be deemed ‘good’ in at least one image, otherwise it is ‘bad’, and when a bad tablet is detected the bottle will be rejected. For lighting MVT chose to use multiple LED arrays and selected GigeVision colour cameras for the image acquisition into one industrial PC. MVTec’s Halcon image processing software forms the basis of MVT’s customised C# application code. A typical feed rate is up to 2,500 tablets per minute per six track feed tray.
Multipix
www.multipix.com T: 01730 233332
/AUTOMATION
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