Load Introduction - HBM C2A/ Série Notice De Montage

Load introduction

4 Load introduction
8
When applied in weighing equipment, load cells are sub­
jected to unwanted side forces and moments. These may
arise from deformation of the loaded weighing machine
structure or through thermals strains. To keep the effects
on the measurement resulting from these forces and mo­
ments as low as possible, HBM supplies pendulum sup­
ports and rubber‐metal bearings as load introduction
components. Both types of load introduction components
enable a design with a degree of horizontal movement
with respect to the load cells.
A deflection causes a reactive force which attempts to
restore the weighing machine to its original position. With
the pendle supports this restoring force is proportional to
the deflection and the current loading and with elastomer
bearings it is just proportional to the deflection. This
means that a different characteristic is obtained, particu­
larly under partial loading conditions.
The rubber‐metal bearing also possesses higher damp­
ing in the horizontal and vertical directions. In both cases
no stay rods are needed. It is sufficient to limit the hori­
zontal movement of the weighing machine structure us­
ing mechanical stops (take note of s
page 16).
A1572-3.0 HBM: public
in chapter 7, on
max
C2A/..., C2A/.../Exd