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Example 1: Storage and handling system for round steel bars

  • We intend to build a storage and handling system for round steel bars. We plan to use a storage rack that will accommodate round steel bars at a height of 640 mm.

    To aid loading and unloading, a truck guided on rails fitted into the floor will be integrated into the storage system. After loading, the truck will be brought into position and travel backwards onto a band saw located opposite the rack. Once sawn, the bars will once more be put into the trolley which will be brought back into position via the guardrail in order to return the bars to the appropriate section on the rack. The compartments and the trolley are provided with rollers to enable the material to be moved to and fro smoothly.

    Which standards and regulations do we need to observe for this design?

    • Roller tracks have many uses within a production process. They are also used in roller conveying systems.
    • Judging by your description, VDI 4418 would seem to fit the bill. This document gives guidance in the planning of automated storage facilities and shows various systems - from honeycomb and portal type to the vertical rotary warehouse complete with rotary station and drive-under truck.
    • Power-driven roller tracks are goods conveyors and used to be covered by VDI 4440-3. But this VDI guideline has been withdrawn without replacement and is therefore not of relevance.
    • Roller conveyors are dealt with in VDI 2690-2.
    • A characteristic that is important for determining the performance of a system (relevant for the design and acceptance of storage systems) is the so-called “cycle time”, specified in VDI 3561 and FEM 9.851.
    • VDI 2493 is also useful, as this gives an overview of the common methods of storage for long goods and the handling and conveying technologies that are required.
    • The associated storage and retrieval equipment is dealt with in DIN EN 528. This is usually used in automated systems. 
    • For flow storage systems see VDI 3584. Flow storage systems can be used for a specific type of compact storage that combines both storage and transport. A list of the documents stated above is attached.

Example 2: CE marking for pedelec mid-drive motors

  • Our company manufactures mid-drive motors for e-bikes. Which standards and EU Directives do we have to comply with so that our products can receive the CE mark?

  • The CE marking is a declaration by the manufacturing company that its products meet the respective legal requirements of the EU. In Germany, the Product Safety Act (ProdSG) applies.

    The Machinery Directive 2006/42/EC applies to the vehicles known technically as pedelecs and in common parlance as "e-bikes", provided they meet the definition set out in EU Regulation 168/2013 Article 2 h): “Pedal cycles with pedal assistance which are equipped with an auxiliary electric motor having a maximum continuous rated power of less than or equal to 250 W, where the output of the motor is cut off when the cyclist stops pedalling and is otherwise progressively reduced and finally cut off before the vehicle speed reaches 25 km/h”.

    This Regulation was implemented into German law with the Maschinenverordnung (Neunte Verordnung zum Produktsicherheitsgesetz, 9. ProdSV) (Machinery Ordinance (Ninth Ordinance to the Product Safety Act, 9th ProdSV)). The EMC Directive 2014/30/EU can also apply, as well as the Low Voltage Directive 2014/35/EU for chargers. All other e-bicycles or e-bikes equipped with an auxiliary drive that exceed these criteria fall under EU Regulation 168/2013 as mopeds.

    Basic safety requirements for mechanical and electrical components of electric bicycles are specified in DIN EN 15194.

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