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Multiple calculations, functions and more supplement counterweight guide-rail calculations.

According to EN 81-20/-50, now in effect in Europe, the tare weight of guide rails for counterweights must be considered: small guide rails may require new brackets during modifications, incurring unnecessary costs. LIWETEC aims to avoid these by an alternative calculation method. According to EN 81-20, guide rails can be calculated according to EN 81-50:2014 or EN 1993-1-1, as well as by the Finite Element Method (FEM).

LIWETEC GmbH’s Elevator Portal calculates the bending drill buckling of the guide rails using the FEM. As a result, general statements regarding bending crinkle, under-tare weight and additional weights can be made in the construction phase. The online portal is a database-driven system available anytime and anywhere. Continuously updated, it is intended to support planning, configuration selection and calculation of entire elevator systems or main components by using a product and system configurator and making technical calculations. The CompuLift module is the centerpiece of the portal and a calculation program for the following technical calculations, additional functions and tools. All calculations are carried out according to EN 81-20/-50 and EN 81-1/-2/-77.

Technical Calculations

  • Cars: surface inspection
  • Lifting cylinder: cylinder, cylinder bottom/piston
  • Ropes: rope reliability calculation for steel ropes, plastic-covered ropes and Polyrope
  • Traction sheaves: calculation of the driving ability and (optionally) surface pressure
  • Radial load: verification of the permissible radial load
  • Pullies/axles: calculation of the axles and bearing durability
  • Beams: calculation of the pulley carriers or general carriers for deflection and permissible bending stress
  • Guide rails: for central, eccentric, L-frame and diagonal guided lifts, including earthquake standard EN 81-77 and/or additional load on the rails
  • Supports: calculation of buffer/cylinder supports for buckling
  • Buffer: selection of permitted buffers for normal buffers and service support buffers
  • Overspeed governors: review of the resulting clamping force and calculation of the rope safety for governor ropes
  • Stopping distance calculation (optional): checks the unintended movement of the car in up and down movements for specified distances

Tools

  • High frame calculation: tool for calculating the wrap angle or axles’ distance by known wrap angle
  • Tension weight calculation: calculation of the resulting clamping force
  • Profile calculation: tool for configurating sheet-metal profiles that can be used in support and beam calculation
  • Shaft calculation: simplified shaft calculation for flying/bilateral traction sheaves
  • Car center of gravity: calculation of the car’s center of gravity by entering the individual components and associated coordinates
  • Safety-gear calculation: total permissible weight check (range of ±7.5%) for modernization
  • Bearing durability: calculation of bearing durability for rolling bearings of rope pullies

Additional Functions

  • Item list module: output of a list of parts of the calculated components and accessories
  • Railplan module: review of a collision between connectors and brackets
  • Force diagram module: automatic output of all forces in the pit and shaft wall
  • Shaft sketch module: simplified sketch for the shaft cross-section
  • Counterweight fillers selection: interpretation of the counterweight based on a maximum filling height and distance between rails
  • Screw calculation: simplified calculation for transverse loads or tensile load of screws

Other Benefits

  • Customizable
  • Security validated annually by TÜV SÜD
  • Automatic plausibility checks of selection after changes
  • Saves time in the planning process through immediate validation and traceability
  • Direct paperless transfer to Notified Bodies
  • Personal onsite training with an expert available

liwetec.com

elevatorportal.com

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