ANB?
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Catalog excerpts

Novlbra® type ANB™ The shock buffer type ANB is used to effectively limit movement of equipment or machine components. Typical field applications would be: r Wagons Forestry vehicles r Cabinets Traversing cranes r Falling goods r Working beams f Off-road material handling equipment Container handling handling equipment Through the damping of the rubber a high degree of energy absorption is achieved. The rubber is stiffer under dynamic conditions compared to static or pseudo static loading; hence more energy is absorbed for a given deformation. Diagram 4 shows the effect of the energy Buffer type ANB consists of a cylindrical rubber body bonded to a square baseplate of steel. Each corner of the baseplate Special high-hysteresis rubber compound is used to ensure as much energy absorption as possible. The volume of the rubber is used at optimum efficiency. For new machine developments simpler designs and lighter calculated forces can be considered enabling a lower cost. Fig, 2. Traverse crane with 2 ANB buffers connected in series

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For calculation purposes the following equations can be used: (7) applicable in free fall Equation (4)- (7) valid for initial velocity = 0

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CALCULATION EXAMPLES The figures in parenthesis refer to the equations. EXAMPLE 1: FREE FALL CALCULATION 1850 kg weight is to be dropped 1.83 metres onto 4 ANB buffers. What size ANB should be used? What force will be Velocity at impact (shock velocity) v = REFER TO ENERGY FACTOR GRAPH If 50% deformation is allowed, the energy factor at 6 m/s is 0.4. Then dynamic energy 33212 Nm corresponds to 33212 ■ 0.4 = 13285 Nm static energy and for 4 buffers the static energy per buffer is 3320 Nm. REFER TO FORCE-ENERGY DIAGRAM Select ANB 200 which can each absorb up to 4300 Nm at 80 mm compression...

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