Pennsauken, N.J. -- Macro Sensors LVDT linear position sensors may be used to replace proximity sensors in the automated control systems of hot air, heat staking machinery used by many high technology and manufacturing industries in the manufacture of thermoplastic assemblies. "In this automated assembly process, super heated hot air melts plastic studs, softening them so they can be formed into specific shapes when driven by a cold stake," said Micro Sensors. This direct contact method allows two dissimilar pieces of plastic and other materials to be joined into one secure assembly.
The HSER 750 Series LVDT linear position sensors provide feedback to the absolute position of the stake depth to ensure repeatable and robust stake joints. Output signals from the LVDTs are fed into a programmable logic controller (PLC) that alerts operators if limits fall out of parameters to ensure correct alignment, said the company.
The LVDT linear position sensors eliminate the need for manual adjustment of proximity sensors by a technician for any design or tooling changes since the LVDTs are mounted in-line and are available in absolute measuring ranges of up to 20 inches. Any physical adjustments of the LVDT sensors can be done through the PLC program, resulting in greater production uptime and fewer technician man hours.
These sensors are hermetically sealed, making them impervious to dirt and other corrosive elements. In addition, sensor coil windings are sealed against harsh environments to IEC standard IP-68 while the housing, bore liner, and end washers are TIG welded, providing a hermetic seal free from oxidation-producing faults that may cause leakage, said Macro Sensors. The sensors are DC powered so there is no need for external AC LVDT signal conditioners.