More than 50% of the space in the package is not for the goods themselves, but for the air and filling materials. This situation is well known and can be felt by everyone, especially when the postman delivers the goods to the door. The joy of receipt is followed by the proper handling of the various parts of the packaging and the filling materials.
Figure 1 Based on accuracy and dynamic requirements, Opitz relies on SEW's servo technology to determine the motion process in the reduction container.
Standard carton revolution
The Vario 558, a reduction container launched by Opitz Machine Technology GmbH in Kalefeld, 30 km north of Göttingen, Germany, revolutionized the world of standardized folding cartons with the goal of making as large as possible standardized cartons of different widths in online trade. The small, reduced container is characterized by its ability to handle cartons of different widths. In the first station, a camera or an ultrasonic sensor measures the height of the product in the carton and thereby determines the folding height or the depth of the cut at the four corners of the carton.
The depth of cut and the position of the machine tool in the corners of the standard carton are always determined by the height of the product and the size of the various carton. In the following process, the cardboard flaps are continuously folded according to the slits and the prepared horizontal grooves, fixed at the correct height by a pressing device and finally sealed.
Figure 2 Internal preview of the reduced container Vario 558: the machine minimizes the volume of the carton
Opitz is a recognized expert in wet bonding technology, which is more leak-tight than plastic tape, which is especially important for high-priced items, as this prevents the package from being opened unauthorised, or at least Can be perceived. Based on accuracy and dynamics, Opitz relies on servo technology in a multi-axis system to implement the motion of the Vario 558, which is based on the automation kit Movi-C with SEW-Eurodrive, with new automation tasks The solution is to optimally mix machine-centric and decentralized drive technology without the need to make concessions on integration or interfaces.
Control cabinet becomes smaller
For the stationary task SEW-Eurodrive, the new Movi-C dual-axis module is used to drive the cutting carriage and the movement of the machine inside the machine. The use of a two-axis module allows for a more streamlined installation and further reduces the required control cabinet area. They are interconnected as a multi-axis system via a DC link for optimum energy efficiency. “The control cabinet is significantly smaller and the space is not a common problem for customers,†explains owner Gunther Opitz. Another consideration is energy efficiency, so each process must match in time. For example, the hoist will never rise at the same time in order to limit the power consumption. When wrong, the braking energy generated when one place is lowered can be used for another workstation. On the rise, this combination saves energy and reduces expensive load peaks.
The decentralized low voltage driver CMP ELVCD (Ultra Low Voltage Compact Driver) is used in the cutting process itself to linearly adjust the tool position with the servo motor driven electric cylinder. The solution is one of the important collaborations that Opitz and SEW-Eurodrive have achieved in the early stages of engineering and drive design. According to the experience of programmer Helge Sunnemann, the motion function programming in Movi-C has been very modern. “SEW makes work very simple, especially for prefabricated components, we only need to connect, which saves a lot of time.â€
Figure 3 Individualized basic shapes with different heights and corresponding embossed grooves, the folding carton is optimized to achieve maximum rationalized packaging and transport safety with minimal volume
Decentralized servo technology brings many advantages to the reduction container. Firstly, the wiring workload is significantly reduced. Because there is no cable between the control cabinet inverter and the motor, the drag chain will inevitably be used, and they will wear and increase frictional resistance. Inertia and mounting position in machine design.
Dispersion technology makes cables less
On the other hand, the low-voltage servo drive ELVCD traveling on the stand has a small weight and sufficient power to achieve optimum supply through the loop energy and communication bus.
Figure 4 Using a low-voltage drive ELVCD and an electric cylinder CMS to adjust the tool, the axis is parallel design
This architecture provides Opitz with a good opportunity to design modular packaging solutions. The use of decentralized servo drives eliminates the barriers of introducing other drives into the network, eliminating the need to question common installation methods or changing control cabinet diagrams. “We have room to install additional shafts,†concludes Technical Director Florian Ahlert.
Combination of centralized and decentralized drives
Observing Opitz's reduction containers, one will be acutely aware of the advantages that a continuous system with centralized and decentralized drive technology can produce. SEW-Eurodrive's Movi-C automation kit also paves the way for future applications, opening up a single machine to a complete system with modern communication interfaces and modularity.
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