Automated high-bay warehouses with stacker cranes have become indispensable in warehousing, material handling, and distribution centers. The automated systems store and retrieve items particularly efficiently. Compact dimensions, high speeds, and increased picking accuracy are just some of the many benefits of this technology.
To ensure high throughput and avoid downtime costs, the stacker crane must be positioned with reliable precision and at high speed. A reliable absolute positioning system is therefore crucial for operation. In addition to having a quick reaction time, this system must provide position data down to the submillimeter.
The absolute positioning system PXV, consisting of a read head and Data Matrix code tape, offers the perfect solution. Measuring just 25 mm in width, the code tape is narrow enough to be installed directly in the shaft of the stacker crane. The 2-D camera is located on the moving carrier. This installation procedure is carried out on the stacker crane’s horizontal and vertical axis. The sensor immediately provides a reliable X- and/or Y-axis position in order to precisely position the stacker crane for storage or retrieval. The position resolution of 0.2 mm and the travel speed of up to 20 m/s make the PXV technology not only highly accurate, but also quick enough to meet the requirements of the control system. While other technologies require calibration and maintenance intervals, neither are necessary in this system because there are no moving parts.
In addition to being highly reliable and accurate over long distances, the PXV system is easy to install and set up. This system does not incur any consequential costs and it can be replaced quickly in case of a fault. If the stacker crane is used in a high-bay warehouse where the items are stored especially high up and safe positioning (redundant position) is needed, the safe version safePVX with PROFIsafe and SIL 3/PL e is available.
For the first time, the new absolute positioning systems safePXV and safePGV realize safety level SIL 3/PL e with a single sensor …